Is ESP Body Stability System Important?

ESP plays a very important role in automobile safety. As an electronic stability system of automobile body, it can control the stability of automobile body to a certain extent. For example, in winter, when the vehicle runs on the icy road with low friction, the direction of the car body will be out of control when the tire slips. At this time, ESP can intervene the anti-skid wheels, thus helping the vehicle to return to a controllable state and ensuring driving safety.

The name ESP is popular in China, but not all cars are called ESP, and some cars can't turn off ESP. It is generally called ESC internationally, but different manufacturers have their own "personalities", such as Honda called VSA, Toyota called VSC, Nissan called VDC, BMW called DSC and so on. , but the general principle is similar.

ESC is a very useful active safety configuration, which can prevent accidents well, so it is widely praised at home and abroad. The function is to slow down. By braking 1 or several wheels, the vehicle speed will be reduced, and the vehicle will return to a controllable state, sometimes limiting the power output.

Because turning too hard may get out of control, and not turning will not get out of control, so ESC will create understeer to avoid losing control.

Extended information: brief introduction of body electronic stability system;

1. Body Electronic Stability System (ESP) is the general name of a system or program, which aims to improve the handling performance of the vehicle and effectively prevent the vehicle from losing control when it reaches its dynamic limit. Electronic stability program can improve the safety and handling of vehicles.

2. Under certain road conditions and vehicle load conditions, the maximum adhesion provided by wheels is a constant value, that is, in the limit case, the longitudinal force (along the rolling direction of wheels) and the lateral force (perpendicular to the rolling direction of wheels) are a trade-off. The electronic stability program can control the longitudinal braking force of each wheel independently, thus exerting influence on the lateral force, thus improving the handling performance of the vehicle.

3. When the longitudinal force reaches the extreme value (for example, the wheel is locked), the lateral force is zero. At this time, the lateral movement of the vehicle will be out of control, that is, it will slip, and it may be impossible to change lanes or turn according to the driver's wishes. The electronic stability program can detect and prevent the vehicle from slipping. When the electronic stability program detects that the vehicle is about to get out of control, it will apply braking force to specific wheels to help the vehicle drive in the direction expected by the driver.

4. When turning, a feasible control strategy is that when the vehicle tends to understeer, the system can apply braking force to the rear wheel inside the turn. As the longitudinal force of this wheel increases, the lateral force it can provide decreases, and then a torque is generated to help the car turn.

5. When there is a tendency to oversteer, the system can apply braking force to the front wheel outside the turn. As the longitudinal force of this wheel increases, the lateral force it can provide decreases, and then a torque against steering is generated on the car body. So as to ensure the driving stability. Some electronic stability program systems will also reduce the engine power when the vehicle is out of control.

6.ESP system consists of control unit, steering sensor (monitoring the steering angle of the steering wheel), wheel sensor (monitoring the rotating speed of each wheel), sideslip sensor (monitoring the rotation state of the car body around the vertical axis), lateral acceleration sensor (monitoring the centrifugal force when the car turns) and so on.

7. Sensors: including steering sensor, wheel sensor, sideslip sensor, lateral acceleration sensor, steering wheel accelerator brake pedal sensor, etc. These sensors are responsible for collecting data on the state of the car body.

8.ESP computer: calculate the data collected by the sensor, calculate the physical state, and compare it with the preset data in the memory. When the data calculated by the computer exceeds the pre-stored value in the memory, that is, when the car body approaches or is out of control, the actuator is ordered to work to ensure that the driving state of the car body conforms to the driver's intention as much as possible.

9. Actuator: The actuator of ESP is a four-wheel braking system. Unlike cars without ESP, the brake system of cars with ESP has the function of pressure accumulation.

Reference: Baidu Encyclopedia Body Stability System