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What is an automotive electronic stability control system?

Jan 03, 2023      View: 327

ESP control is a further optimization of ABS and adds body stabilization functions. It is an anti-centrifugal force system that identifies centrifugal force hazards and corrects the vehicle condition.



ESP is currently the most integrated a body stability electronic safety system, is based on the wheel slide adjustment system, it collects ABS (Anti-lock Brake System), BAS (Brake Assist System), EBD (Electronic Brakeforce Distribution System), VDC (Vehicle Dynamics Controller Vehicle Dynamics Controller), ASR (Skid Control Acceleration Anti-Skid Control System), TCS (Traction Control System Traction Control System) and EDS (Electronic Differential Lock) and several other safety systems, is an extension of the functions of these systems.


It is an anti-skid system, ESP is able to identify vehicle instability and implement control through the brake system, engine management system and transmission management system, so as to make up for vehicle slippage in a targeted manner to prevent the vehicle from sliding off the track, which can be said to be the highest form of current automotive anti-skid device.


Composition of ESP


ESP mainly consists of the brake (hydraulic) system, sensors (signal input device), actuators, electronic control units and warning devices (instrumentation), which are the major components of the braking system is the brake booster (actuator).


Sensors are more complex, including wheel speed sensor (wheel sensor (monitoring the speed of each wheel rotation)), transverse swing rate sensor, lateral acceleration sensor (monitoring the car turning centrifugal force), lateral acceleration sensor, side slip sensor (monitoring the state of the car body rotation around the longitudinal axis), brake pressure sensor, longitudinal acceleration sensor, steering wheel angle sensor, steering sensor (monitoring the steering wheel The control unit mainly consists of the engine electronic control unit, ABS electronic control unit, hydraulic control unit, dynamic hydraulic pump units. The control unit uses the signals from these sensors to determine the operating status of the vehicle and then issues control commands.


Most of the ESP components are shared with ABS and ASR, and sensors are added to the original ABS and ASR, such as steering wheel angle sensors, transverse angular velocity sensors, lateral acceleration sensors, etc.; the ECU adds ESP control functions; the actuator is improved on the basis of the original ABS and ASR actuators, so that the ASR braking energy supply device can be used for each wheel individually. braking (ASR can only brake on the drive wheels).


The Result of Losing Electronically Stable ESP


ESP helps maintain the dynamic balance of the vehicle by analyzing information about the vehicle's driving status from various sensors and then sending corrective commands to ABS and ASR. ESP allows the vehicle to maintain optimal stability in a variety of conditions, and is more effective in oversteer or understeer situations.


ESP generally requires the installation of steering sensors, wheel sensors, side slip sensors, lateral acceleration sensors, etc. ESP can monitor the car's driving status and automatically apply braking force to one or more wheels to keep the car in its normal lane, and can even apply brakes up to 150 times per second in some cases.


Electronic Stability Program (ESP, DSC, etc.) is a set of active safety features that integrate active safety systems such as Anti-lock Brake (ABS), Brake Force Distribution (EBD), Brake Assist (EBA, BA) and Traction Control (ASR, TCS) into the system. In the event of an emergency, ESP can correct the body posture and correct the vehicle's trajectory. It can effectively prevent accidents or reduce the incidence of accidents and reduce accident injuries.


ABS's in the system can prevent the wheels from locking up during emergency braking, the tires lose grip, and the vehicle can steer during emergency braking. ebd can actively distribute braking force, when the vehicle brakes, if the left side friction is less than the right side friction, the vehicle will lose control. after ebd is activated, the brake system will redistribute braking force to prevent the vehicle from losing control.


The brake assist system (EBA) is designed to help the vehicle achieve maximum braking force. When the driver brakes in an emergency, the EBA system will achieve maximum braking force based on the vehicle status and brake pedal force. The traction control system will monitor wheel dynamics and reduce engine power output to prevent loss of vehicle control after the drive wheels slip.


The electronic stability program is completed by these systems working together to correct the body attitude. ESP can detect the operation status of each wheel, and when danger occurs, the ESP system can apply brakes to single or multiple wheels, while reducing power output and correcting the body state and driving trajectory.


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