Automotive safety electronic technology terminology explanation: What is BA, ASR, EBD, ESP?

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Automotive safety electronic technology terminology explanation: What is BA, ASR, EBD, ESP? [Copy link]

■ABS

Anti-Lock Brake System is the abbreviation of "anti-lock braking system". Without ABS, when the car is in emergency braking, the four wheels are completely locked. At this time, the car will skid as long as it is under the action of slight lateral force (such as a tilted road or a small stone on the ground), and the car will swing sharply or even turn around completely; and what is more dangerous is that when the car is driving on a curve, the front wheels are locked and the car will lose the ability to turn. At this time, although turning the steering wheel can also drive the front wheels to turn, the car cannot turn due to the lack of adhesion of the wheels, but moves forward along the inertia direction until it stops. With ABS, the wheel locking can be controlled by controlling the release and retraction of the brake oil pressure. When the wheel brakes, the sensor installed on the wheel can immediately sense whether the wheel is locked and transmit the signal to the computer. The computer will immediately reduce the braking force of the locked wheel, and the wheel will continue to rotate. When it rotates to a certain extent, the computer will apply the brake again to ensure that the wheel is braked but not locked. This is repeated until the car stops completely. The computer can detect the wheels hundreds of times in one second and operate the brake system dozens of times at the same time. In the "lock-release-lock-release" cycle, the vehicle is always in a critical locking gap rolling state. Cars equipped with ABS can significantly improve the braking performance of the car and have a certain steering avoidance ability.

■EBD

is the full name of Electric Brakeforce Distribution in English, which literally means "electronic brake force distribution" in Chinese. When the car brakes, if the conditions of the four tires adhering to the ground are different, the friction between the four wheels and the ground is different, and it is easy to slip, tilt and roll over when braking. The function of EBD is to calculate the friction values of the four tires due to different adhesion at high speed at the moment of braking, and then adjust the braking device so that it can be adjusted at high speed during movement according to the set program to achieve the matching of braking force and friction (traction) to ensure the stability and safety of the vehicle.

EBD can be said to be an auxiliary function of ABS in essence, which can improve the effectiveness of ABS. Therefore, in terms of safety indicators, the performance of the car is better. When the brakes are pressed hard, before the ABS acts, EBD automatically compares the slip rate of the rear tires with the front tires based on the vehicle's weight and road conditions. If the difference is found to be adjusted, the brake oil pressure system will adjust the oil pressure transmitted to the rear wheels to obtain a more balanced and ideal distribution of braking force. Therefore, EBD+ABS is based on ABS to balance the effective ground grip of each wheel, improve the balance of braking force, prevent tail swing and lateral movement, and shorten the braking distance of the car.

■BA

BrakeAssist (BA)

When braking in an emergency, the braking system automatically senses and outputs stronger braking force according to the speed and force of the brake.

1. When braking in a critical state, due to the high speed and small force of the brake, the output braking force is sometimes very small.

2. At this time, the driver does not keep braking, which may cause the braking force to decrease.

3. The "BA system" automatically determines whether it is an emergency brake when the brakes are pressed quickly, and will increase the braking force output even if the force is insufficient. 4. When the "BA system

" brakes consciously, it automatically reduces the auxiliary braking force to reduce the abruptness of the brake.

■ASR

drive anti-skid system (or traction control system) The traction control of the car can be achieved by reducing the throttle opening to reduce the engine power or by brake control and wheel slip. The car equipped with ASR works by combining these two methods, that is, ABS/ASR.

The role of ASR is to control the slip within a certain range when the car accelerates, thereby preventing the drive wheel from slipping quickly. Its functions are to improve traction and maintain the driving stability of the car. When driving on slippery roads, the drive wheels of cars without ASR are prone to slip when accelerating; if it is a rear-drive vehicle, it is easy to drift, and if it is a front-drive vehicle, it is easy to lose control of the direction. When there is ASR, the car will not have or can reduce this phenomenon when accelerating. When turning, if the drive wheel slips, it will cause the entire vehicle to deviate to one side. When there is ASR, the vehicle will turn along the correct route. In a car equipped with ASR, the mechanical connection between the accelerator pedal and the gasoline engine throttle (diesel engine injection pump operating lever) is replaced by an electronic throttle device. When the sensor sends the position of the accelerator pedal and the wheel speed signal to the unit (CPU), the control unit will generate a control voltage signal, and the servo motor will readjust the position of the throttle (or the position of the diesel engine joystick) according to this signal, and then feed back the position signal to the control unit so as to adjust the brake in time.

■ESP

electronically controlled driving stability system, its full name in English is Electronic Stabilty Program, which is an extension of the functions of the two systems of ABS and ASR. Therefore, ESP can be regarded as the most advanced form of anti-skid device for automobiles at present.

The ESP system consists of a control unit and a steering sensor (monitoring the steering angle of the steering wheel), a wheel sensor (monitoring the speed of each wheel), a side slip sensor (monitoring the state of the body rotating around the vertical axis), and a lateral acceleration sensor (monitoring the centrifugal force when the car turns). The control unit judges the running state of the vehicle through the signals of these sensors and then issues a control command. The difference between a car with ESP and a car with only ABS and ASR is that ABS and ASR can only react passively, while ESP can detect and analyze the vehicle condition and correct driving errors to prevent them from happening. ESP is particularly sensitive to oversteer or understeer. For example, if a car oversteers left (turns too sharply) on a slippery road, it will drift to the right. When the sensor senses the slip, it will quickly brake the right front wheel to restore adhesion, generating an opposite torque to keep the car in its original lane.

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阿查泼才

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dxy08

I learned it, thank you

chaichenxv

I learned it, thank you

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