Detection system and method for vacuum degree sensor of vacuum power-assisted system of electric automobile
A technology of vacuum degree sensor and vacuum booster, which is applied in the direction of brake safety system, brake, brake transmission device, etc., and can solve the problems such as the durability and reliability of the electric vacuum pump that affect the safety of the brake, and the action of the electric vacuum pump is inconsistent with expectations. Achieve the effect of improving reliability and increasing coverage
Active Publication Date: 2019-11-12
CHINA FIRST AUTOMOBILE
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Problems solved by technology
Non-electrical faults, that is, the voltage of the vacuum sensor is within the normal range, but the output voltage has deviated from the normal value, resulting in a discrepancy between the vacuum value calculated based on the output voltage of the vacuum sensor and the actual real value, resulting in the action of the electric vacuum pump inconsistent with expectations, and then Affects brake safety and durability reliability of electric vacuum pumps
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[0040] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.
[0041] In the description of the present invention, unless otherwise clearly stipulated and limited, the terms "connected", "connected" and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or a mechanical connection. A connection can also be an electrical connection, a direct connection, or an indirect connection through an intermediary, or an internal connection between two elements or an interaction relationship between two elements. Those of ordinary ...
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The invention belongs to the technical field of electronic automobiles, and discloses a detection system and method for a vacuum degree sensor of a vacuum power-assisted system of the electric automobile. The detection system for the vacuum degree sensor of the vacuum power-assisted system of the electric automobile comprises a brake vacuum booster, a vacuum air storage tank, an electric vacuum pump, a one-way valve, a brake pedal, the vacuum degree sensor, a position sensor, an atmospheric pressure sensor, a brake controller and an electric control unit, wherein the detection method for the vacuum degree sensor of the vacuum power-assisted system of the electric automobile adopts the detection system for the vacuum degree sensor of the vacuum power-assisted system of the electric automobile. According to the system and the method, a standard vacuum loss degree value obtained through tests is stored in the electric control unit, during actual calibration, an instant vacuum loss degreevalue is compared with the standard vacuum loss degree value in a corresponding state, the fault diagnosis can be carried out on the credibility of the vacuum degree sensor under a non-electrical fault, the degree of coverage of a vacuum degree sensor diagnosis strategy is increased, and the reliability of a brake device is improved.
Description
technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a vacuum degree sensor detection system and method for a vacuum booster system of an electric vehicle. Background technique [0002] For pure electric vehicles, whether the brake vacuum booster can maintain a certain vacuum in real time during braking, so that the driver can smoothly step on the brake to brake the vehicle, is of great significance to the safe driving of the vehicle. However, the vacuum degree of the brake vacuum booster of an electric vehicle comes entirely from the electric vacuum pump, and the basis for whether the electric vacuum pump works is mainly the vacuum degree in the brake vacuum booster measured by the vacuum sensor. Therefore, whether the vacuum sensor can accurately measure the vacuum in the brake vacuum booster is of great significance to ensure the reliability and durability of the electric vacuum pump and the safety of braking. [0003...
Claims
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Login to View More IPC IPC(8): B60T17/22B60T13/52
CPCB60T13/52B60T17/22
Inventor 祝浩徐家良
Owner CHINA FIRST AUTOMOBILE