Electric vehicle with vacuum pump control system

Abstract

The invention discloses an electric vehicle with a vacuum pump control system. The electric vehicle with the vacuum pump control system comprises a vehicle controller, a vacuum pump, a vacuum pressure sensor, an ambient pressure sensor, a speed sensor and a braking sensor. A controlling method for the electric vehicle with the vacuum pump control system comprises the following steps that step A, the vehicle controller controls the motor output torque in the recycling and braking process according to speed and braking pedal switch signals; step B, signals are detected according to the ambient atmospheric pressure; step C, the relative pressure range of braking is determined, the absolute pressure range in a vacuum system is calculated, and whether starting the vacuum pump body is needed or not is determined; step D, opening degree signals and the changing rate of the opening degree of the braking pedal are collected to determine whether gas leaking is existed in the prior vacuum system or not; and step E, if gas leaking in the vacuum system is determined, the vehicle controller brakes enforcedly to reduce the speed until the vehicle is stopped, and an emergency light is turned on. According to the electric vehicle with the vacuum pump control system, the basic performance of the vacuum pump can be improved, running braking stability and reliability of the electric vehicle can be improved, running safety of the vehicle is ensured, applicability is high, and practicability is good.

Description

technical field [0001] The invention belongs to the technical field of electric vehicle braking, and in particular relates to an electric vehicle with a vacuum pump control system. Background technique [0002] During the running of the car, the reliability of the braking system is directly related to the driving safety of the car. In conventional vehicles, vacuum boosters are usually used as the auxiliary power boosting method of the vehicle braking system, and the degree of vacuum directly affects the braking effect; in electric vehicles, the drive motor replaces the engine, and there is no vacuum source for the booster , that is, it cannot produce a boosting effect. At this time, the vacuum booster cannot provide the necessary power guarantee for the driver, and the electric vacuum pump can solve this problem well through the detection of sensors and logical judgment. The use of the electric vacuum pump can ensure that the vacuum degree in the booster is maintained at...

AI Technical Summary

Problems solved by technology

Vacuum pump control can not operate according to the speed of the vacuum in real time, wasting electric energy

When the vehicle is running in a plateau area or an area with low atmospheric pressure, the braking pressure of the vehicle is different in plain areas and high altitude areas, resulting in a hard pedal feel and insufficient braking force in high altitude areas.

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