Hill-start assist control: the essence of the system and how it works

Passenger comfort and safety are extremely important factors for automakers when producing modern vehicles. Moreover, if 5-10 years ago electronic assistants when driving a car were inherent only in the most expensive models, recently even budget models are equipped with a number of assistants. One of the most important for the driver is the Hill-Start Assistant Control system. In order for the car owner to understand how this option works and when it can help, you need to clearly understand the essence of such a service, as well as the principle of its operation.

Flu, how dangerous it is and how to prevent the disease

How to remove restrictions and bans on a car FLU, HOW DANGEROUS IS IT AND HOW TO PREVENT THE DISEASE? FLU

– a disease that is transmitted by airborne droplets, by inhaling viral particles, and also through objects used by a sick person.

Susceptibility – high, in persons at risk:

-children from six months of age,

-students of 1st - 11th grades;

-students of educational institutions;

-workers of medical and educational organizations, trade, transport, public utilities;

- persons over 60 years old,

-pregnant women,

- persons subject to conscription for military service,

- persons with chronic diseases, including lung diseases, cardiovascular diseases, metabolic disorders and obesity.

How dangerous is the flu?

The highest risk of developing complications from influenza is in children under 2 years of age, adults 65 years of age and older, and people of any age with chronic heart, lung, kidney, blood, or metabolic diseases such as diabetes or frailty. immune system in women during pregnancy. The disease can lead to hospitalization and death, more often among these high-risk groups.

There are several main types of complications from influenza:

Pulmonary complications (pneumonia, bronchitis). Pneumonia accounts for the majority of influenza deaths;

Ø from the upper respiratory tract and ENT organs (otitis media, sinusitis, rhinitis, tracheitis);

Ø from the cardiovascular system (myocarditis, pericarditis);

Ø from the nervous system (meningitis, meningoencephalitis, encephalitis, neuralgia, polyradiculoneuritis).

Flu symptoms (sudden):

ØHigh temperature (38-40 degrees)

ØIntoxication (profuse sweating, weakness, joint and muscle pain, headache).

ØPainful cough, chest pain, runny nose, dry mucous membrane of the nasal cavity and pharynx).

IMPORTANT! If signs of influenza or ARVI appear, you should seek medical help. Remember! Self-medication in case of flu is unacceptable and leads to loss of precious time!

IT HAS BEEN PROVEN THAT ONE OF THE MOST EFFECTIVE PREVENTIVE MEASURES IS ANNUAL VACCINE PREVENTION OF ALL GROUPS

IT HAS BEEN PROVEN THAT ONE OF THE MOST EFFECTIVE PREVENTIVE MEASURES IS ANNUAL VACCINE PREVENTION OF ALL GROUPS

POPULATION,

At the same time, in people with chronic heart and lung diseases, vaccination reduces mortality by 28%, in people with diabetes, the risk of hospitalization is reduced by 79%, the risk of myocardial infarction in people with chronic heart disease is reduced in vaccinated people by 50%, and the risk of stroke by 24%.

When to get vaccinated? September-October is the optimal time for vaccination,

since there is not yet a pronounced rise and peak in the incidence of ARVI.

Every person needs vaccination. 70-80% of vaccinated employees in the team create an immune layer that reliably protects against the flu.

To prevent influenza and ARVI

During the year, it is necessary to maintain a daily routine that includes walks in the fresh air; eat rationally

(fresh vegetables and fruits, lactic acid products, fish, meat); carry out hardening procedures; do exercises; wash your hands with soap or wipe with disinfectants.

For those working in the field

service workers (who have contact with a large number of people) when the incidence rate rises, use personal protective equipment - masks.

Remember - your health and the health of your children is in your hands!

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How it works

Such assistants work on the basis of a dynamic stabilization system.

In fact, it is a software extension installed on many vehicles. To be fair, HSA cannot be called an independent and independent system.

VMZ 9.601 trailer: where to buy, characteristics, conversion options

The system is activated fully automatically. The participation of the driver himself is not required. He doesn't need to press any buttons or levers. In most cases, auto-activation occurs when the sensor detects a vehicle tilt angle of 5 degrees or more. Moreover, this angle can be adjusted to a smaller or larger direction so that the driver can use the capabilities of the electronic auxiliary assistant as comfortably as possible.

To get underway, the driver must, in the absence of HSA, quickly remove his foot from the brake, or turn off the handbrake, and start as quickly as possible. Otherwise the car will pull back.

When the brake pedal is released, the brake system itself continues to function. This will happen until the throttle valve opens.

For what reasons may the system not work?

As a rule, the hill start assist, which is built into the main control unit for the ABS or ESP assistants, does not work in the following situations:

• The systems control unit itself does not work;
• there is a problem with the wheel rotation sensors;
• there was a break in the electrical wiring or sensors;
• excessive wear of brake pads;
• there is not enough fluid in the brake system;
• There is liquid between the brake discs and pads, which prevents effective braking.

Principle of operation

The dynamic stabilization system operates according to the control unit program. The essence of the work is to compare the current trajectory with the expected one, which is directly related to the driver’s actions.

As the vehicle moves, obstacles arise that change its trajectory. For example, the front or rear wheels may skid. In this case, the angular acceleration will differ from that required at the current wheel angle and speed. Lateral acceleration will also increase. The difference between the actual and required acceleration will affect the braking forces of the wheels.

The dynamic stabilization system operates not only when any obstacles appear. Control operations performed by the driver are sometimes insufficient. At such moments, you need to slow down one of the wheels until the trajectory becomes optimal.

Principle of operation

All noise picked up by microphones and sensors is sent to an electronic processor, where it is analyzed and converted. The sounds are then transmitted to speakers, which generate an antiphase of the same amplitude. Thanks to this, the noise of units and mechanisms inside the car is practically inaudible.

High-frequency waves superimpose on low-frequency waves—antiphase is obtained. The waves cancel each other out, resulting in the sound becoming inaudible. It is this property of sound waves that underlies this high-tech device.

Conventional microphones are best at picking up monotonous and linear noises, such as the rustling of wheels on asphalt or the smooth purr of an engine. But as soon as the sound tone changes sharply (the driver pressed the accelerator pedal or there was a hole in the road), ordinary microphones do not have time to catch it and a sharp sound is heard in almost complete silence.

To avoid this, special, more sensitive sensors are installed that can monitor sudden sound changes. Based on their readings, the electronics produce sound in antiphase, which is then output by the speakers. In this way, low-frequency sound is stopped before it reaches the ears of the vehicle occupants.

It should be noted that this invention does not apply to the outside of the car; noise is absorbed only in the cabin and only with the doors and windows closed. The main background of silence is created in the area where the headrests are located. This increases the comfort of staying in the car, but does not solve the problem of eliminating sounds from the street and reducing the noise level of some mechanisms on the car. The best results can only be achieved with an integrated approach to solving the problem of sound insulation.

Design and principle of operation using the example of Lada Vesta

The principle of operation of Hill Start Assist on a Lada Vesta car is not very different from the general approach used on other cars.

The device works on the principle of reducing pressure in the brake system after releasing the gas pedal.

There are three components required to activate an HSA:

1. The car is started;
2. The brake pedal is depressed;
3. The tilt angle exceeds 5% (unless another parameter has been previously set).

The device itself operates on the basis of four cycles (phases), each of which performs a specific task:

1. Sufficient brake pressure is created for operation;
2. Ensures that the brake pressure is maintained;
3. The pressure in the brake system decreases;
4. Pressure is released.

At the moment the brake is pressed (at the time of ascent), the brake system performs its functions provided that the valves (switching and inlet) are open. As a result, Hill Start Assist provides braking pressure to keep the car in one place.

After the brake is released, the switching valves close, and the required pressure is maintained in the brake circuits, which prevents the car from rolling away when the foot is moved from pedal to pedal.

As soon as the throttle valve opens (the gas pedal is depressed), the bypass valves open. This factor helps reduce brake pressure.

After the motor rotation torque reaches the required frequency, the switching valves open 100%, which guarantees pressure relief.

It is worth noting that Hill Start Assist only works on ascents. An interesting fact is that the direction of movement does not matter. So, the device will work even when driving uphill in reverse.

How does HAC work?

The essence of the work of this assistant can be described as follows: after the driver removes his foot from the brake pedal, the pressure in the brake system decreases extremely slowly, which ensures that the car is kept static for several seconds. Such a service will work subject to the following conditions:

• the angle of inclination at which the assistant can operate is 5 degrees or more;
• The ignition is turned on in the car and the engine is running;
• the brake pedal is depressed.

The very principle of the assistant’s work involves four main cycles:

• creation - during this period, maximum braking force is observed as a result of pressing the brake pedal;
• holding - the brake pressure is maintained at a high level until the car moves off;
• decrease - the force of the braking system becomes weaker;
• reset – there is no brake pressure in the system.

Operating principle

So, when it has become clear what the lane assist system consists of, let's look at the features and principle of its operation. For example, let's take the Side Assist system - installed on AUDI or Volkswagen - it works very simply - everything is based on monitoring all movement within a certain radius from the car, which is most important behind it.

That is why this safety system is sometimes called a lane change assistance system. Initially, it turns on only when you press a certain key on the dashboard, however, it goes into active mode only as soon as the car reaches a speed of 60 kilometers per hour or higher. The main role in the work is played by a special radar. As already mentioned in the section on the design of the system, it monitors the road situation and monitors the presence of foreign objects in the control zone.

Analysis of the results obtained from the radar is the job of electronic control units. There are 2 of them in the system - one on each side of the car. In fact, they perform the following tasks:

• Control and tracking of all moving objects on the road.
• Distinguish moving objects from stationary ones - road poles, parked cars, road fences.
• The control unit is also responsible for turning on a special warning sensor at the moment of danger. By the way, if we talk directly about the signal lamp, it turns on in the following 2 cases:

1. Information mode. Characterized by continuous burning of the lamp. Triggers when an obstacle is in the car's blind spot.
2. Warning mode. This is how the lane change assistance system works. The indicator flashes continuously when changing lanes if there is an obstacle in the blind spot in the form of another road user. By the way, the system understands that the driver intends to change lanes by the turned on turn signal. If you try to change lanes without warning other road users. The system will hinder maneuver in every possible way.

Turning assistance

During long turns, the system also does not remain idle, but actively helps the driver make the maneuver. In fact, the control system helps the driver stay on the intended trajectory during the entire maneuver.

The device electronically creates a virtual lane with clear boundaries and does not allow the driver to go beyond them.

If the system for some reason fails to cope with the corrective function, an emergency notification to the driver is activated - usually this is vibration of the steering wheel and column, which will certainly attract attention

System differences depending on manufacturer

In general, traffic assistance system is an adapted name for all similar active safety services. The original names of the systems differ depending on the manufacturer. By the way, the principle of operation itself may also differ slightly in places. So let's look at the differences in more detail:

• Lane Assist is exactly the example of which we examined in detail the operating features of all similar systems in general.
• Lane Departure Prevention – developed by infinity. The difference from other systems is quite significant and lies in the fact that when leveling the trajectory, this active safety service does not interfere with the operation of the steering, but does this by braking the wheels on one side of the car.
• Lane Keeping Assist from Mercedes-Benz uses exactly the same ultrasonic sensors in its work, which makes the system more accurate and, so to speak, long-range.

In general, there are still a great many similar systems with different names. However, in fact, only the system names that the developers gave them differ. Otherwise, the principles of operation remain similar, and the goal of the entire system is completely the same - to ensure the safety of the driver and passengers when changing lanes or driving straight in their lane.

HAC and Toyota technology

Hill-Start Assist Control (HAC) is standard on all RAV4 models. This is one of the advanced Driver Assist Technologies (DAT), which allows RAV4 to perform any maneuvers even in the most extreme conditions and in any terrain. On a steep climb, when you change the position of your foot from the brake pedal to the gas lever, the car usually starts to roll backwards. However, Hill Start Assist Control (HAC) prevents this from happening. In this situation, HAC is activated when the brake pedal is pressed until the HAC indicator is displayed in the instrument panel. This continues for another two seconds. That is, the effect that was obtained when pressing the brake is preserved, which keeps the RAV4 in place. This gives the driver time to put his foot back on the brake.

What is Hill Start Assist?

Device.

Hill Start Assist is a set of components whose action is aimed at preventing the car from rolling away on an inclined road.

The main task.

Simplify the driver’s work when stopping on an incline (for example, before a traffic light at an intersection) and eliminate the use of the handbrake. HSA is installed on passenger cars of Russian and foreign brands.

The purpose of Hill Start Assist is to create additional braking force that will keep the car on a steep slope. In this case, the holding force occurs after the brake pedal is released.

Thanks to the action of HSA, when you move your foot from the brake pedal to the gas pedal, the car does not roll away, but is securely fixed in one place.

Such a system is a reliable assistant if you need to frequently move around the city, in off-road conditions or on mountain roads.

Novice car enthusiasts get confused by abbreviations. The reason for this phenomenon is easy to explain - each manufacturer has an individual name for HSA:

1. At Volkswagen, the system discussed in the article is called Hill Hold Control (abbreviated as HHC).
2. Manufacturers Fiat or Subaru have Hill Holder.
3. Toyota has Hill-Start Assist Control (HAC or HSA).
4. The manufacturer Nissan has Uphill Start Support (abbreviation USS).

The assistance device, which ensures that the car is fixed on a hill, is based on dynamic stabilization.

We are talking about a software extension installed on many cars. This means that Hill Start Assist is not considered an independent system.

HSA is activated automatically when the machine is parked on a slope of 5 degrees or more.

The specified angle can be adjusted in one direction or the other to achieve the greatest comfort in motion.

When the driver plans to move away, he releases the brake and then puts his foot on the gas.

When the brake pedal is released, the braking system continues to operate until the throttle valve is opened. This action prevents the car from rolling away, which increases traffic safety and comfort for the motorist.

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Multifunctionality of technology

The Hill start assist system is capable of performing a lot of useful functions, making it easier for the driver to drive his car. These functions include:

• When the driver changes his foot from the brake pedal to the throttle to start the car on a slope, the system maintains brake pressure for about two more seconds. This occurs after the driver's foot is on the brake pedal;
• In this case, the car remains motionless even when the driver does not press the brake. Hill start assist helps prevent vehicles from rolling back when moving from a stop on a slope;
• If a trailer is attached to the car, which is carrying a heavy load, then the technology can again help out when lifting the car up. Although you need to take into account that if the slope is too long (high), you should not try to lift a heavy load. After all, the system’s action lasts only 2 seconds, and if the driver fails to return his foot to the brake pedal in time, the car will roll again. This process is not that impossible. That is, with some effort it can end successfully. However, you should understand that to get a positive result you will need to try.

System design

The system uses a large number of sensors and control units. The listing and diagram refer to Volkswagen cars, since they are the most common cars with a start-stop system. Products from other vehicle manufacturers have minor design differences.

Schematic diagram of the components of the start-stop system

The system includes the following components:

In addition, the system uses:

• 1 — power steering;
• 2 — speed sensor;
• 3 - various sensors on the engine;
• 4 — driver’s seat belt fastened sensor;
• 5 - air conditioning system;
• 6 - terminal 50R;
• 7 - terminal 30;
• 8 - on-board multimedia system.

Fiberglass-filled batteries (EFB) are used to provide increased engine starts. The electrolyte in such devices is located inside the pores of the fiberglass fabric laid between the battery plates. The batteries require no maintenance and provide increased starting amperage.

EFB battery design diagram

Another difference between cars with a start-stop system is the generator and voltage regulator, connected via a digital data bus. Such a connection allows you to control the operating parameters of the nodes and use this data during system operation. The starter has increased strength and wear resistance. The windings are adapted to repeated restarts at short intervals.

The electronics include a special voltage stabilizer with an output power of 180-300 W. An electrical energy storage device is installed inside, which is transmitted to the on-board network through an electronic rectifier. The device smoothes out voltage ripples when the starter is activated. Thanks to this, during start-stop operation, the multimedia system, instrument cluster and external lighting lamps do not turn off.

A number of cars (for example, Honda or Mercedes-Benz) have a start-stop system built on the basis of a reversible generator. The device is equipped with a reinforced drive belt and a specially designed tensioner. A switchable tensioner allows the electric machine to operate in generator or starter mode. The advantage of the design is the quiet operation and speed of operation (2 times faster than with a conventional starter).

System with reversible generator

The Japanese company Mazda offers an original system based on the principle of injection and ignition of the fuel mixture in the cylinders. The engine stops based on a signal from the sensors, and the pistons stop in a certain position. After the start signal is given, the position of the pistons is polled. Based on the data received, the control unit injects fuel into the cylinders and ignites them in a given sequence. An additional impulse to the crankshaft is given by the starter, which is connected for a short time.

Mazda start-stop system

Installing the “Start-Stop” button with your own hands

1. Option with ignition key - you will need to use a key. Through it, the ignition is activated, and to start the engine, you will need to press the button.
2. Long and short press. The first way to start the power unit is that the starter turns the engine while the button is pressed. The second option is somewhat more convenient - by pressing the button once, the starter will rotate the power unit until it is activated.
3. Various options for ignition activation. Turning on the ignition by pressing the button and second, activating it only together with the starter. The option is simple, but tasteful. A quick start button for the power unit can be constructed from a pair of relays. A set of relays and backlit buttons will cost about 400 rubles. You can install any diode - there will be no large currents there.

Installing a Start-Stop button instead of an ignition switch will require the utmost patience and delicacy on your part. Which circuit to choose depends on the capabilities of the car and the skills of its owner, but the global web with its variety of connection schemes will help you.

Application

Using the bas system is, of course, good, but if the surface is slippery, then sudden blocking of all wheels will lead to an uncontrolled skidding of the car. This can lead to unpredictable consequences, which is why developers use it in conjunction with abs. This is an anti-lock braking system that ensures that the wheels are not completely locked, which keeps the car controllable. It turns on on slippery surfaces and is activated in conjunction with pressing the brake pedal. This process is a little more complicated than with the bas system alone. When you press the brake pedal sharply, the ABS system is activated first; it does not completely block the wheels, but only reduces their rotation speed. This is the beginning of braking. Next, the computer compares the speed of the distance traveled from the moment the pedal is pressed and the time passed with the speed of the car itself. If the linear speed of rotation of the wheels is less than that of the car, then this indicates a slippery surface. If both speeds are equal, then bas, the auxiliary braking system, is activated and completely blocks the rotation of the wheels. But of course, this does not mean that the car itself will detect the danger on the way and brake in time. Therefore, driver vigilance is paramount.

ABS BAS in a car

It should be noted that using only abs alone is also not a good idea. This is due to the fact that the wheels will not stop completely when it is activated, and will ultimately lead to a head-on collision. To avoid such situations, even on a new car, all safety systems should be regularly checked and diagnosed. You can check it in two ways: measure your braking distance on different surfaces or check the car on a diagnostic stand with computer diagnostics. Such installations will measure the resistance force of the rollers and the degree of ejection of the car from the measurement zone.

After all, when driving along the road, the conditions on it are not always the same; under one wheel there will be a good and clean surface, and under another there will be sand or a puddle, or better still, spilled oil. Then, of course, when blocked on a slippery place, the wheel will slide, and on a dry surface it will slow down. To prevent this from happening, the system cyclically polls the speed sensors located in the wheels and the brake pedal sensor. And it intermittently reduces the pressure, which is expressed by characteristic knocks on the pedal itself and jolts of the car. Such manipulations allow you to average the value of adhesion to the surface, which reduces the risk of turning the car or moving skid.

The use of abs and bas systems significantly reduces the braking distance of a car on flat and hard surfaces compared to cars without such devices. Therefore, they became mandatory, just like the abs itself.

Compatible with DAC

The system supports drivers on steep hills and downhill slopes. In addition to HAC (Hill-Start Assist Control), another technology can be used in the car - DAC (DownHill Assist Control). The HAC supports drivers on steep hills, while the DAC does the same when going downhill. The driver may experience sudden instances when the vehicle slips when descending steep inclines or when driving on slippery surfaces (say, in winter). HAC minimizes vehicle rollback by controlling brake fluid pressure when the driver's foot leaves the brake pedal and moves to the throttle. In addition, DAC maintains vehicle speed at 5 km/h to ensure vehicle stability when going down steep slopes or slippery surfaces.

No HAC system

Without Hill start assist, the following occurs:

1. When going up a steep hill, the vehicle rolls back and has difficulty getting up without a push as it slips;
2. The HAC system helps increase control over the machine and prevents the wheels from turning in different directions.

No DAC system

If you do not install this system in your car, the following will happen:

1. The wheels lock when you press the pedal when descending a steep slope;
2. The system improves handling when descending steep and slippery surfaces.

What it is

Most often in car reviews and articles, the abbreviation HSA is found, which stands for Hill Start Assist.

In fact, this translates as an assistant or assistant when starting uphill.

This is a complex of special components and electronics, the operation of which is aimed at preventing the machine from moving backward on different slopes. In simple terms, when starting up a hill, the car does not start going backwards. This is an excellent alternative to sudden starts, when there is a risk of simply stalling, and also a way to eliminate the use of the handbrake. Agree that hitting a standing car from behind is not the most pleasant and cheap pleasure. So this requires skill from the driver, or the presence of an HSA system.

I doubt that every time you stop at a traffic light or an intersection with a slope, a person with wheel chocks will be ready to sit in the passenger seat and insure you if you fail to start.

The system creates additional braking force. It is with its help that the vehicle can be held on steep slopes without using the brake pedal or activating the handbrake.

Actually, it is at the very moment when the driver releases the brake and tries to accelerate in order to move forward that this force is created.

Thus, due to the work of the electronic assistant, the driver, moving his foot from one pedal to another (from brake to gas), the vehicle begins to roll back. Instead, the machine remains in a stable, stationary state. When the driver presses the gas, the car begins to move. Actually, this is where all the problems of even a novice motorist end. From this we can conclude that this system is a very useful and reliable assistant, which is unlikely to be superfluous in any car.

If the car is going to be sold and you see a similar abbreviation in the list of components, you should definitely agree.

It is unlikely that once you receive a hill start assistant, you will have to think about how to turn it off.

What is the essence of the HAC assistant?

The HAC driver assistance service owes its appearance to the Japanese car]Toyota[/anchor]. Auto company specialists have developed this assistant, which helps prevent the car from rolling back in the opposite direction when starting to drive uphill. The presence of such an assistant allows the driver not to use the handbrake. The use of such an assistant is extremely important when starting to drive on steep slopes, where many motorists are unable to hold the car and allow it to roll downhill or stall.

The appearance of the HAC assistant was made possible thanks to the existence of a dynamic stabilization system. At its core, this service is not a separate technical element, but involves the installation of additional software to the existing stabilization system. Its use prevents the car from rolling down when starting on a hill. By using the assistance system, a braking force is generated for the car, due to which the car is kept stationary for several seconds.

Let's start on an uphill climb without rolling back

Used Minivans From Japan

The most difficult areas for us, the ladies behind the wheel, will be those with a large inclined angle. It was also difficult for me because my feet are small and my feet are narrow. Therefore, at first I kept getting caught when moving my foot from the brake to the gas between the pedals. Then this problem disappeared on its own. The leg remembered what movement it should make in order to land exactly where it should.

Universal algorithm of action

In driving school they teach you how to use the handbrake. Well, it has the right to life - let’s look at this method now.

You are on a climb, the engine is running, the handbrake is locked, the gearshift lever is in neutral.

• Depress the clutch and engage first gear.
• Lightly press the gas pedal. At the same time, we bring the engine speed to 2500 rpm. Fix the gas pedal in this position. If you don’t yet have the ability to listen to the engine and determine by the sound the desired degree of holding the gas pedal, then we focus on the number of revolutions (the device, by the way, is called a tachometer).
• Now release the gas pedal very slowly. This must be done smoothly and without jerking. We also release the clutch very smoothly. If you suddenly release the pedal, the engine will stall. We release the clutch until the speed on the tachometer shows approximately 1500 revolutions.
• Now the most important point - let go of the handbrake. If everything is done correctly, then you will move off without any problems. And remember - everything is done smoothly. Sudden movements will cause the engine to stall.

Let's go uphill without a handbrake

Everyday, common and, in my opinion, most acceptable.

• Starting position: gear shift lever in neutral, right foot on the brake pedal, handbrake not fixed (we don’t remember about it at all now, it’s not there and that’s it).
• First, depress the clutch and engage first gear. We made sure that nothing will interfere with the movement, we proceed further.
• Smoothly (smoothly!) release the clutch pedal until you hear the sound of the load on the engine (the brake is pressed). By the sound of the engine and by the slightly dropped speed on the tachometer, you can determine whether the clutch has engaged.
• The main thing with this method is to practice smooth movement of the clutch pedal
  . If you suddenly “release” the clutch, the engine stalls. This sad thing is familiar to every novice car driver, and certainly to lady car drivers. All the ladies I know considered the clutch pedal, at the learning stage, enemy number 1.
• Now release the brake (the clutch pedal is in the same position). Quickly, but smoothly, we throw our right, freed leg onto the gas, press the gas pedal and, lo and behold! - We move off elegantly.

That's it, the ability to feel the car has arrived and the ability to move away on an incline too. You can be proud of yourself, now you will enjoy driving and feel like an all-powerful tamer of an iron horse.

What cars is it installed on?

There is some debate among car enthusiasts about which vehicles HSA is intended for. Initially it was planned for cars with an automatic transmission.

Over time, the system was improved, and it was used on different types of gearboxes (including manual ones).

The worst performing combination was the manual transmission and HSA. The reason lies in the principles of the system.

The Hill Start Assist device responds to three components - pressing the brake pedal, releasing and opening the throttle valve (pressing the accelerator pedal). The pads stop working after turning on the transmission and increasing the speed.

In the case of manual transmissions, a decrease in pressure is possible in case of over-throttle at neutral speed. As a result, the car rolls back. The driver does not expect such a trick from the device and ends up in an accident.

The reason is that Hill Start Assist is not able to clearly recognize the throttle change and the start of movement on a manual transmission.

This is why HSA in combination with “mechanics” is practically not in demand. If such a system is installed on your manual car, then you should be careful on descents, because the unit fails at an unpredictable moment.

Learn more about the VSA device

VSA is a rather complex electronic system that consists of two main parts - ABS and traction control. The relationship between VSA and the car, which consists of obtaining information about its operation, which can be reduced to data on threats to directional stability, is carried out through sensors. Sensors mainly monitor how the transmission operates. Their specialization also includes monitoring engine operation, brake pressure, lateral acceleration, the angle at which the steering wheel is turned, engine power, and the rotation speed of each wheel. Thus, through the sensors, the system receives almost all any significant information about threats to the vehicle’s directional stability. Such surveillance is carried out 25 times per second. The synthesis of all this information is carried out in the computing unit that the VSA system has.

If the car's movement is not adjusted, if the car is moving at high speed, it may end up in a ditch. However, not only high speed can be a threat to directional stability when cornering, but also excessively sharp braking of the car.

VSA adjusts directional stability using feedback from the vehicle - using its actuators, the system distributes the vehicle's braking force to each wheel individually according to an algorithm programmed in the system processor. The system under consideration has many functions in distributing braking force to each of the wheels, but the main one is: resistance to lateral force, which, without counteraction, would turn the car around a vertical axis, combined with ensuring the smoothness of the necessary braking.

Results

Hill Start Assist is a whole set of components, the work of which is aimed at preventing rolling away when starting to move on a road with a slope of more than 5 degrees.

The main objective of this improvement is to make the driver’s work while stopping on a hill as simple as possible and to make the use of the handbrake unnecessary.

1. HSA is a very good assistant for novice car enthusiasts. Buying a vehicle with such a function by a person without driving experience is the right decision.
2. If the driver has extensive driving experience, then having an HSA system is not at all necessary.
3. It is also undesirable to install this function on cars with a manual transmission - it is more of a hindrance than a help.

On what vehicles can the system be used?

As you know, the system itself is designed to protect cars from rolling when starting to move on an incline whose slope exceeds 5 degrees. Initially, the developers planned to use it only on models equipped with an automatic transmission. However, after the excellent results demonstrated by the service when working in tandem with an automatic transmission, manufacturers decided to try to use a similar system on vehicles equipped with a manual transmission. Despite the fact that the developers revised the principle of operation of the assistant and tried to adapt it to “mechanics”, reviews of its work in this case are not as good as for cars with automatic transmission. The main problem is that the service does not understand when the driver starts moving and when he performs a normal change of gas. As a result, instead of help, the car owner may end up with additional problematic situations. Therefore, if a car equipped with a manual transmission is equipped with such a service, the driver will need to undergo a series of training to adapt to its operation.