Rear-end collision prevention brake system CMS (rear-end collision reduction brake system)[汽车维修知识]

Rear-end collisionBraking System(CMS: Collision Mitigation brake System) When the danger of rear-end collision is detected, the driver can be alerted to prompt the driver to take preventive measures in time to controlbrakeAnd reduce the speed. CMS and electronicsseat beltThe pretensioner can alert the driver to the danger of rear-end collision through the alarm sound and physical sensation, prompting him to take preventive measures, and through the brake booster (Brake Assist) that compensates for the driver's insufficient brake pedal force, the seat belt control that improves the restraint and Before a collision occurs, the brakes are controlled and the vehicle speed is reduced to reduce the injury in the rear-end collision.
CMS and electronic seat belt pretensioners can detect vehicles driving within 100m ahead through microwave radar, and measure the distance and relative speed to the vehicle in front.Moreover, the yaw rate can besensor(Yaw Rate Sensor), rudder anglesensor, Wheel speed sensor and brakePressure SensorWait to grasp the driving state of the vehicle you are driving and predict the way forward. This information is transmitted to the control ECU (electronic control unit) of the CMS through the VSA-ECU integrated hydraulic device, and the control ECU of the CMS determines whether there is a danger of collision. When the CMS control ECU is in danger of colliding with the preceding vehicle and the distance between the vehicles is shortened, it uses the beep sound and the multi-function information on the instrumentmonitor“BRAKE” is displayed on the (Multi-Information Display) to inform the driver that there is a danger of collision. CMS control ECU and electronic seat belt pretensioner,carThe dynamic stability control system (VSA) and the kilometers meter exchange information at any time. According to the brake instruction signal of the control ECU of the CMS and the signal of the electronically controlled brake booster, the control ECU of the electronic seat belt pretensioner sends out instructions to tighten the seat belt .
When getting closer to the vehicle ahead, CMS will automatically brake slightly, and the electronic seat belt pretensioner will softly retract the seat belt 2 to 3 times to inform the driver of the danger of collision through physical feeling. At this time, if the driver brakes by foot, it will be judged as an emergency brake, and the brake booster will be activated to assist in the operation of avoiding rear-end collision. When the CMS thinks that the collision is unavoidable, the electronic seat belt pretensioner will forcefully retract the seat belt to improve the protective effect of the "gunpowder type" seat belt pretensioner activated during the collision. At this time, CMS will also automatically apply strong braking to reduce the collision speed. Even when the CMS is not activated, the electronic seat belt pretensioner will tighten the seat belt due to the driver's strong braking and activation of the brake booster.
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