Electric automobile brake power-assisted vacuum pump controller circuit and control method

Abstract

The invention relates to an electric automobile brake power-assisted vacuum pump controller circuit and a control method. A pressure increase operation amplifying circuit and a pressure reduction operation amplifying circuit provide amplifying signals to a single-chip microcomputer respectively, an alarm output circuit provides an alarm signal to the single-chip microcomputer, a temperature detection circuit provides a current temperature signal to the single-chip microcomputer, a current protection circuit provides an over-current signal to the single-chip microcomputer, the single-chip microcomputer controls a vacuum pump to be started, a sensor circuit provides an air pressure electric signal, a grounding circuit ensures that the two operation amplifying circuits work normally, and a power circuit supplies a power source for the pressure increase operation amplifying circuit, the pressure reduction operation amplifying circuit, the grounding circuit, the sensor circuit, the single-chip microcomputer, the temperature detection circuit and the vacuum pump. By controlling the vacuum pump to start and stop, the air pressure value in a vacuum tank is controlled, and the effect of braking assistance is achieved. The controller circuit has multiple protection functions, avoids burnout of the vacuum pump, and prolongs the service life of the vacuum pump and a storage battery.

Description

technical field [0001] The invention provides a brake booster vacuum pump controller circuit and control method for an electric vehicle, which relates to the fields of pressure sensors, automatic control, amplification circuits, etc., and controls the negative air pressure in the vacuum tank to play the role of brake booster. Background technique [0002] New energy vehicles are one of the strategic emerging industries that China is accelerating its cultivation and development, and its market share is increasing year by year. New energy vehicles have become a trend and can enjoy various favorable policies. At present, domestic vacuum pump controllers are relatively simple in technology and low in safety and reliability. During use, there are problems such as non-stop and non-start, power input terminals are subjected to voltage shocks, and components are burned. In a cruel environment, the start point and stop point deviate from the design. If the value is fixed, the vacuum ...

AI Technical Summary

Problems solved by technology

At present, domestic vacuum pump controllers are relatively simple in technology and low in safety and reliability. During use, there are problems such as non-stop and non-start, power input terminals are subjected to voltage shocks, and components are burned. In a cruel environment, the start point and stop point deviate from the design. The fixed value will cause the vacuum pump to start frequently or not stop, which greatly consumes the service life of the vacuum pump and the battery, and is easy to cause damage to the vacuum pump.

[0003] For example, the products on the market use an electric pressure switch to start the vacuum pump for 8 seconds when it is lower than the set value, and then stop working. The working characteristics are very mechanical and the control accuracy is low. In the environment, not only the sensitivity is low, but also it is very easy to malfunction, and the safety stability is very low

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