High-voltage power-off strategy for fuel cell vehicle

Abstract

The invention discloses a high-voltage power-off strategy for a fuel cell vehicle, relates to the technical field of fuel cell vehicles, and specifically discloses a high-voltage power-off strategy for the fuel cell vehicle. The system comprises a vehicle control unit (VCU), an auxiliary energy source 1, an auxiliary energy source 2, a bidirectional DC, a starting switch, a low-voltage distribution box, a high-voltage power distribution unit (PDU), an electric drive unit (EDU), a hydrogen fuel system (FCU+HTMS) and a 12V storage battery; transmission and receiving of information are carried out through a CAN bus among ECUs, and the peculiarity of a control strategy is caused by a unique hydrogen fuel cell system of a hydrogen fuel cell vehicle. The high-voltage power-off strategy has the beneficial effects that a corresponding power-off flow is designed according to the electrical characteristic of the hydrogen fuel cell system is guaranteed, the stability and reliability of high-voltage power-off are guaranteed, the practicability, applicability and safety of the hydrogen fuel cell vehicle are improved, and the using requirement of people is met effectively.

Description

technical field [0001] The invention relates to the technical field of fuel cell vehicles, in particular to a high-voltage power-off strategy for fuel cell vehicles. Background technique [0002] With the continuous aggravation of environmental pollution, the more and more serious problem of air pollution in our country urgently needs to be controlled and solved. In this source of air pollution, heavy truck exhaust emissions occupy a large share, followed by the promotion of new energy vehicles, new The high-voltage power-off control strategy of energy vehicles is an important application field of vehicle control. With the rapid development of new energy vehicles, the high-voltage power-off strategy of new energy vehicles is basically perfect; but with the rise of hydrogen fuel vehicles, the original strategy Not applicable to the fuel cell stack system, the design of a new high-voltage power-off control strategy will inevitably become a trend, and the high-voltage power-off...

AI Technical Summary

Problems solved by technology

[0003] However, the power-off strategy for new energy vehicles in the prior art: by detecting that the bus current of the power battery is lower than a certain value (generally 10A), cutting off the battery discharge relay and sending the MCU off-wave command, cannot be well adapted to the requirements of hydrogen energy vehicles.

Images