Power-on control protection system of fuel cell bus

Abstract

The invention relates to a power-on control protection system of a fuel cell bus. The system comprises a VCU, an FCU, pre-charging loops, a high-voltage contactor, a hydrogen concentration sensor, a display screen and an alarm, wherein the pre-charging loops are connected with the analog quantity output end of the VCU; two pre-charging loops are provided; each group comprises two branches which are connected in parallel; the first branch in the first group comprises a fuel cell relay; the second branch in the first group comprises a pre-charging resistor and a fuel cell pre-charging relay connected with the pre-charging resistor in series; the first branch in the second group is a main positive relay; the second branch in the second group comprises a pre-charging resistor and an electric control pre-charging relay connected with the pre-charging resistor in series; and the pre-charging resistor is shared by the two pre-charging loops. Compared with the prior art, it is ensured throughpower-on protection that the fuel cell bus cannot be powered on by high voltage when hydrogen leaks, so that the driving safety is improved, meanwhile, a pure electric system can work normally, and the error-tolerant rate and the customer experience are improved.

Description

technical field [0001] The invention relates to the technical field of control of fuel cell buses, in particular to a power-on control and protection system for fuel cell buses. Background technique [0002] Fuel cell buses have become a hot spot for new energy buses. By using clean and renewable energy, they can realize the advantages of fast energy loading, high driving range, no pollution, and low cost. However, the development of fuel cells is still in its infancy. The fault tolerance rate of the fuel cell system and the vehicle is not high at present, and it is very easy to cause gas leakage during the high-voltage power supply process, and non-dangerous failures will cause the vehicle to fail. drive. The fuel cell system and the drive system in the bus are connected in parallel and share a pre-charging circuit, which is actually a series structure. When a battery system fails, the shared pre-charging circuit cannot work properly due to the series structure. Therefore...

AI Technical Summary

Problems solved by technology

However, the development of fuel cells is still in its infancy. The fault tolerance rate of the fuel cell system and the vehicle is not high at present, and it is very easy to cause gas leakage during the high-voltage power supply process, and non-dangerous failures will cause the vehicle to fail. driving

The fuel cell system and the drive system in the bus are connected in parallel and share a pre-charging circuit, which is actually a series structure. When a battery system fails, the shared pre-charging circuit cannot work properly due to the series structure.

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