Vacuum pump control system and method for double pressure sensors

Abstract

The invention discloses a vacuum pump control system and method with dual pressure sensors, comprising a vacuum tank, a vacuum pump controller, a vacuum pump connected with a hose of the vacuum tank, the signals of the vacuum pump and the vacuum pump controller are connected, and the vacuum tank is also provided with an insulating Pressure sensor, differential pressure sensor and the joint used to connect with the vehicle brake booster system, the absolute pressure sensor, differential pressure sensor and vacuum pump controller signal connection; the absolute pressure sensor is used to monitor the absolute pressure value in the vacuum tank, the differential pressure Sensors are used to monitor the difference between the pressure inside the vacuum tank and atmospheric pressure. The invention provides a vacuum pump control system and method with dual pressure sensors, which can control the pressure of the vacuum source in different regions according to the local atmospheric pressure, and can accurately judge the abnormality of the sensor and provide an emergency plan.

Description

technical field [0001] The invention relates to the field of vacuum pump control, in particular to a vacuum pump control system and method with dual pressure sensors. Background technique [0002] With the continuous reduction of oil resources and environmental protection factors, new energy vehicles are bound to develop rapidly. At present, the brake booster system of new energy vehicles uses a vacuum pump system, but the control systems on the market are all relatively simple, and there are two main disadvantages: [0003] First, it is impossible to judge the atmospheric pressure. China has a vast territory and the deviation of regional atmospheric pressure is large. If the atmospheric pressure cannot be judged, only a unified pressure control range can be used, which will lead to system abnormalities in the plateau area. [0004] Two. It is impossible to accurately judge the state of the sensor. The sensor is used as a pressure detection element, and if it fails, the sys...

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Problems solved by technology

[0003] First, it is impossible to judge the atmospheric pressure. China has a vast territory and the deviation of regional atmospheric pressure is large. If the atmospheric pressure cannot be judged, only a unified pressure control range can be used, which will lead to system abnormalities in the plateau area

[0004] 2. It is impossible to accurately judge the status of the sensor. The sensor is used as a pressure detection element, and if it fails, the system can be paralyzed

[0005] The above two hidden dangers can cause the system to be paralyzed and the driver cannot detect it. Once the system fails, the brakes will lose power and may cause a car accident. With the continuous improvement of people's safety requirements for the whole vehicle, the vacuum pump control system must solve these two serious problems. security risks

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