First brake also need to help. When the driver treads on the brake pedal, the pedal-connected push rod transmits force to the vacuum booster. A vacuum booster is a device that passes the torque amplification and then transmits it to the hydraulic brake master pump for braking by pressure difference between the atmosphere and the vacuum. The vacuum source is produced by the negative pressure of the engine. Electric vehicles or electrically driven plug-in hybrid vehicles cannot obtain a stable vacuum source because they do not have an engine or an engine that does not work. At the same time, the new energy model itself needs to be as far as possible through the power motor for braking energy recovery, how to coordinate the distribution of the two brake power is a great challenge.
One way to deal with the challenge of new energy vehicles is to use electronic vacuum pumps. But the electronic vacuum pump needs to continue to operate, compares the fuel consumption. At the same time, once the electronic vacuum pump failure The entire braking system will lose the vacuum booster, affect the reliability. Another smarter way is to use an electronically controlled braking system.
Traditional brake system + Electronic Vacuum pump + electromechanical brake caliper
The traditional brake system driver treads on the brake pedal, through the push plate through the vacuum booster amplifier torque to the brake master pump. The braking total pump drives the hydraulic system to transmit the braking force to the/braking anti-lock/electronic stabilizing system controller. /Then assigns the braking force to four wheels according to the condition of the vehicle.
Audi Q5 Hybrid version of the EHCB electro-hydraulic control brake system consists of electronic vacuum pump, ESP brake electronic stability system unit, brake pedal, front axle hydraulic disc brake, electronic handbrake switch, sensor array, can communication bus and electromechanical brake calipers.
The brake caliper, as shown in the picture, converts the output of the brushless DC motor from the torque to the linear motion torque through the gearbox. The braking torque of the rear axle can be controlled electronically. So as to make up for the shortage of electronic vacuum pump reliability.