Redundant electric vacuum boosting system for electric vehicle braking based on double vacuum tanks

Abstract

The invention provides a redundant electric vacuum boosting system for electric vehicle braking based on double vacuum tanks, and belongs to the technical field of electric vehicle braking. The systemcomprises two two-position three-way electromagnetic valves, two vacuum tanks, two vacuum sensors, two one-way valves, an electronic control unit, a vacuum booster, a storage battery, a relay, an electric vacuum pump and the like; the connection between every two components is divided into a gas circuit connection and an electric circuit connection; the gas circuit connection is divided into a conventional boosting gas circuit and an emergency boosting gas circuit; and when the system is trouble-free, the electronic control unit does not apply control to the two two-position three-way electromagnetic valves, the conventional boosting gas circuit works; when the electronic control unit judges that the conventional brake boosting circuit breaks down, the two two-position three-way electromagnetic valves are controlled to select the emergency boosting gas circuit to work. According to the system, the working reliability of the vacuum boosting system of an electric vehicle can be improved, the braking safety of the electric vehicle is improved, and especially the braking safety during emergency braking is improved.

Description

technical field [0001] The invention belongs to the technical field of electric vehicle braking, and in particular relates to a redundant electric vacuum booster system for electric vehicle braking based on double vacuum tanks. Background technique [0002] With the gradual increase in the number of motor vehicles, environmental pollution and lack of oil resources are becoming more and more obvious. Because of the advantages of green environmental protection and high energy utilization efficiency of electric vehicles, countries all over the world are actively researching electric vehicles that can replace traditional vehicles; At the same time, electric vehicles have become an important direction of my country's automobile development. [0003] With the improvement of people's requirements for the safety and comfort of automobile braking, similar to traditional vehicles, the vacuum booster braking system is also a must-installed equipment for electric vehicles, but the differ...

AI Technical Summary

Problems solved by technology

[0004] The boosting characteristics of the vacuum booster system depend on the air pressure on both sides of the vacuum booster diaphragm, that is, the difference between the atmospheric pressure and the vacuum chamber pressure, which determines the braking feeling of the braking system; Compared with the electric vacuum booster system, the electric vacuum booster system has more components and more gas circuit connections. When the electric vehicle travels for a certain mileage, the related components will fail. For example, when the car is driving on a bumpy road, the vacuum booster gas circuit is prone to loosening , At this time, it will lead to insufficient power assistance. In case of emergency braking, the braking distance will be too long, which will affect driving safety.

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