Vacuum power-assisted braking system of electric automobile and control method thereof

Abstract

A control method of a vacuum power-assisted braking system of an electric automobile comprises the following steps of detecting igniting signals, and executing the next step if the igniting signals are detected, or else a vacuum pump is not started; detecting braking signals and pressure of an air storage tank, wherein the vacuum pump works and a bit zone is determined to be true if the braking signals are detected or the pressure of the air storage tank is higher than a higher limit value, or else a next step is executed; and detecting the bit zone and the pressure of the air storage tank, wherein the vacuum pump works and the bit zone is determined to be true if the bit zone is detected to be true and the pressure of the air storage tank is no higher than a lower limit value, or else the vacuum pump stops working and the bit zone is determined to be false. Compared with the prior art, the control method of the vacuum power-assisted braking system of the electric automobile considers the braking signals to be a first condition for judging whether the vacuum pump is started or not, and avoids the condition of insufficient vacuum degree of the air storage tank caused by continuous stepping on a braking pedal when a downward slope is met.

Description

technical field [0001] The present invention relates to an automobile brake system, and in particular to a vacuum booster brake system of an electric automobile and a control method thereof. Background technique [0002] At present, cars are generally equipped with a vacuum booster braking system. In traditional cars, the vacuum of the intake manifold when the engine is working is mainly used to ensure the brake booster. In electric vehicles, the vacuum pump is generally used to pump the air storage tank into a vacuum negative pressure to ensure the continuous effectiveness of the power-assisted braking. However, this consumes too much energy and makes a lot of noise. At the same time, the vacuum pump does not stop working and fails. The possibility is also high, so once the vacuum pump fails, the brake booster system will have no vacuum source, which will seriously affect the driving safety and vehicle handling performance of the driver. [0003] In order to solve the abov...

AI Technical Summary

Problems solved by technology

This technology cannot accurately judge the suitable stop conditions of the vacuum pump 203, which may cause waste of energy or poor braking boost effect

In addition, this technology does not use the foot brake signal as a judgment condition for starting the vacuum pump 203, or uses it as a backup condition, which cannot guarantee the quickness and effectiveness of the brake booster during braking.

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