Electric vehicle, and brake control method and system thereof

Abstract

The present invention discloses an electric vehicle and a brake control method and system thereof. The method comprises the following steps: detecting, by a liquid level sensor, a liquid level of brake fluid to output a liquid level detecting signal; after determining that a normally-closed reed pipe is in a disconnected state and a line fault occurs at the liquid level sensor according to the received liquid level detecting signal, determining that a line fault occurs at the braking system of the electric vehicle, generating a high level triggering signal and issuing a fault alarm reminder according to the high level triggering signal by an alarm unit; and when an overall vehicle controller receives the fault alarm reminder, identifying a fault type of the braking system and performing brake control on the electric vehicle according to the fault type of the braking system. The brake control method can perform fault alarm both when the brake fluid is insufficient and the line fault occurs at the liquid level sensor, and can perform corresponding security protecting control on the electric vehicle by means of identifying the fault type of the braking system, thereby improving the security performance of the electric vehicle and ensuring the travelling safety of the vehicle.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a braking control method for an electric vehicle, a braking control system for an electric vehicle and an electric vehicle with the braking control system. Background technique [0002] At present, most of the braking systems of electric vehicles use hydraulic pressure to transmit power, and the driver's operating force is transmitted to the brakes, so as to realize the braking of electric vehicles. Wherein, the braking system of the electric vehicle includes a liquid level sensor for detecting the brake fluid to judge whether the brake fluid meets the braking requirement. [0003] In the related art, the liquid level sensor used to detect the brake fluid is usually an on-off float sensor, which can only be turned on when the brake fluid is lower than the normal value, and the fault light of the instrument is turned on. However, when there is an open circuit in the sen...

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Problems solved by technology

However, when there is an open circuit in the sensor circuit, the fault light will not be able to light up all the time. At this time, even if there is insufficient brake fluid, the fault light cannot be used to alarm, so there is a certain potential safety hazard.

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