Fuel cell vehicle power off control method and device

Abstract

The invention provides a fuel cell car power-off control method. The method comprises the steps that when a whole vehicle controller sends a high-voltage power-off command, a motor controller, a battery management system and a fuel cell controller are triggered to enter a power-off delay process; when a fuel cell completes high voltage power-off operation, the whole vehicle controller enables a high voltage loop contactor to be disconnected, the motor controller completes safe consumption of high voltage storage electric energy of the motor controller and electric energy stored by a super capacitor in a boost DC / DC converter through internal insulated gate bipolar transistors; and when the electric energy stored by the capacitor completes safe consumption, the whole vehicle controller enables corresponding relays of the motor controller, the battery management system and the fuel cell controller to be disconnected, and low voltage power-off operation is completed. By adopting the method, through the design of a whole vehicle high and low voltage electric system, precise control over the fuel cell power-off delay process is realized, and the safety of a high-voltage loop after power-off operation is completed is ensured through existing internal components inside the motor controller.

Description

technical field [0001] The invention relates to the technical field of new energy vehicles, in particular to a power-off control method and device for a fuel cell vehicle. Background technique [0002] With the rapid development of new energy vehicle technology, new energy vehicles have been vigorously promoted in the automotive field, and fuel cell vehicles have become the focus of research in the field of new energy vehicles due to their characteristics of zero pollution, diversified fuel sources and renewable energy. . Fuel cells are the core components of fuel cell vehicles. Due to their particularity, power reduction, load removal, and cleaning are required during the power-off process of fuel cell vehicles, resulting in a long delay in the power-off process. Moreover, the DC / DC converter used for boosting the fuel cell contains a supercapacitor. When the fuel cell vehicle is powered off, the electric energy stored in the supercapacitor needs to be released to avoid po...

AI Technical Summary

Problems solved by technology

[0003] At present, during the power-off process of fuel cell vehicles, each controller in the power system of the fuel cell vehicle controls the respective power-off delays, which is not conducive to the coordination and precise control of the fuel cell vehicle on the power-off process.

Moreover, the supercapacitor in the DC / DC converter used to boost the fuel cell can only release the stored electric energy after the power is turned off, which poses a big safety hazard

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