Fault type diagnosis method and device

Abstract

The invention provides a fault type diagnosis method and device. When the to-be-detected part fails, an actuator can report a fault to the electronic controller in a mode of pulling down a level signal. Furthermore, the level lowering time corresponding to different fault types is different. Therefore, the electronic controller receives the level signal sent by the actuator through the hard wire,and the fault type is judged according to the pull-down time of the received level signal. Thus, the electronic controller can directly determine the fault type according to the pull-down time of thelevel signal. Compared with the prior art that message analysis and judgment need to be conducted, the diagnosis process is simplified, the actuator does not need to be directly connected with the vehicle control unit through a CAN bus, corresponding functional modules of the actuator are reduced, cost is saved, and user experience is improved.

Description

technical field [0001] The present application relates to the field of diagnosis and control, in particular to a fault type diagnosis method and device Background technique [0002] With the development of new energy vehicles and the country's increased support for new energy vehicles, more and more electric vehicles have been put into the market. [0003] As an important part of electric vehicles, the cooling system includes radiators, water storage tanks, water pumps, and fan assemblies. Its main function is to dissipate the heat generated by the car's accessories into the air, so as to prevent the parts from overheating and causing the car to fail to drive normally. . However, in actual use, the fan assembly may have various fault types such as stalled rotation, dry rotation, and open circuit of the internal circuit, resulting in the inability to dissipate heat from the heat-generating components, causing damage to the heat-generating components, and even causing life an...

AI Technical Summary

Problems solved by technology

[0005] However, in the prior art, the sub-controller must analyze the fault type, then add the fault type to the message, and then send it through CAN. Therefore, the sub-controller must include an analysis module and a CAN transceiver module, and the vehicle controller must include an analysis module. , so as to realize the fault diagnosis of the fan assembly, the process is complicated, and, because the sub-controller must have the corresponding module, the diagnosis cost is increased

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