Vacuum servo system and electric vehicle

Abstract

The invention discloses a vacuum servo system and an electric vehicle, and relates to the technical field of vehicle braking. The vacuum servo system comprises a pressure sensor, a vehicle speed sensor, a pedal speed sensor, a vacuum processing unit, a vacuum servo unit and an electric vacuum pump. The vacuum processing unit adjusts a starting threshold value and a closing threshold value of the electric vacuum pump according to environment pressure data, vehicle speed data and treading speed data, and when the vacuum degree is lower than the starting threshold value, the vacuum servo unit controls the electric vacuum pump to be started. Compared with a servo system in the prior art, since the pressure sensor, the vehicle speed sensor and the pedal speed sensor connected with the vacuum servo unit are adopted, the starting threshold value and the closing threshold value of the electric vacuum pump can be flexibly adjusted according to external conditions, therefore starting or closing of the electric vacuum pump is flexibly controlled, the using frequency of the vacuum servo system is lowered, the service life of the vacuum servo system is prolonged, the practicability is high, and the cost performance is high.

Description

technical field [0001] The invention relates to the technical field of automobile braking, in particular to a vacuum booster system and an electric automobile. Background technique [0002] The vacuum system is a booster system in the hydraulic braking system of electric vehicles, which can improve the braking capacity of the hydraulic braking system and improve driving comfort. The existing vacuum booster system controls the start and stop of the electric vacuum pump (EVP) by detecting the vacuum degree in the vacuum booster system and comparing it with the set threshold value. When the vacuum degree is higher than the set value, the electric vacuum pump is stopped. (EVP), when the vacuum degree is lower than the set value, turn on the electric vacuum pump (EVP). Moreover, the vacuum booster system cannot maintain the vacuum in the pipeline for a long time after the car is parked. After the car is started, in order to ensure driving safety, it needs to wait for a while bef...

AI Technical Summary

Problems solved by technology

The inventor found that the current electric vacuum pump cannot be turned on and off flexibly according to the external conditions, resulting in a high frequency of use of the electric vacuum pump and a reduced service life, and the vacuum booster system cannot continue to maintain the vacuum in the pipeline after the car is turned off

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