The vacuum booster pump is generally on the lower right side, behind the brake oil box:
1. The vacuum booster pump is a part of the braking system. When the car brakes, in order to reduce the labor intensity of the driver's feet;
2. At the same time, the brake response is made more sensitive. At the working end of the brake master cylinder, a device similar to an air storage tank is installed, but this is not a place for storing air, but a container for storing negative pressure;
3. Use the negative pressure generated by the engine air intake to extract the air inside the booster pump, and then generate negative pressure inside the booster pump. When braking, use the generated negative pressure to pass the diaphragm and transmission rod to the brake. The master cylinder produces additional drive to reduce the amount of force applied by the driver to the brake pedal.
The vacuum boosting effect of the braking system is related to the driving safety of the car. In the brake booster system of automobiles, the booster effect of the brake system will be poor because the vacuum booster cannot obtain vacuum or the vacuum obtained is insufficient. The electric vacuum pump can monitor the change of the vacuum degree in the booster through the vacuum degree sensor, so as to ensure that the driver can provide sufficient assistance effect under various working conditions
Electric vehicles are driven by electric motors, eliminating the traditional engine, so they lose the vacuum source, that is, they cannot provide vacuum boost for the car brake master cylinder. The electric vehicle vacuum booster pump is produced to make up for this deficiency. It uses on-board power supply to provide power, pushes the motor on the pump body to move the piston to generate vacuum, and provides the only and reliable vacuum for the hydraulic braking system of various models such as electric vehicles, hybrid vehicles, electric sightseeing vehicles, and electric field vehicles. source, thereby effectively improving the braking performance of the vehicle
Working principle：
1. The effect of vacuum boost depends on the relative vacuum, that is, the ratio of the negative pressure value in the booster cylinder to the outside atmospheric pressure. It is recommended to collect the pressure value in the cylinder and the atmospheric pressure outside the cylinder at the same time, and the start and stop thresholds are calibrated as two relative vacuum values.
2. The ability of the vacuum pump to vacuum is actually based on the relative vacuum degree, that is, the maximum vacuum degree is the percentage of the relative external air pressure. The external atmospheric pressure decreases with the increase of altitude, and the corresponding absolute vacuum degree in the cylinder also decreases, and the boosting effect will also be weakened accordingly.
3. In terms of control strategy, if the booster cylinder is small, it is recommended that the start trigger of the vacuum pump be directly related to the brake signal, and only use the calibrated threshold trigger for shutdown to improve the booster effect of continuous braking
4. When the electric vacuum pump is applied to the electric vehicle, it should be considered that under the condition of frequent starting and stopping, the exhaust port will be sucked back instantly when it stops. It is necessary to prevent the inhalation of water and dust.
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