Hybrid power automobile high-pressure system electric leakage fault diagnosis device and method

Abstract

The invention discloses a hybrid power automobile high-pressure system electric leakage fault diagnosis device and method. The high-pressure system comprises a direct-current converter, a starting and generating integrated motor and a lithium battery, the positive electrode of the starting and generating integrated motor is connected with the positive electrode of the direct-current convert and the positive electrode of the lithium battery separately, and the negative electrode of the starting and generating integrated motor, the negative electrode of the direct-current converter, the negative electrode of the lithium battery are grounded separately; the device comprises a system controller which is connected with the direct-current converter, the starting and generating integrated motor and the lithium battery through a CAN bus separately, the system controller receives a current Ib of the lithium battery, a current Im of the starting and generating integrated motor and a current Id of the direct-current converter in real time through the CAN bus, the vector sum of the current Ib, the current Im and the current Id is calculated, an absolute value Isum is obtained, and the system controller diagnoses the severity of electric leakage according to the size of the absolute value Isum. The hybrid power automobile high-pressure system electric leakage fault diagnosis device and method can prevent car burning accidents.

Description

technical field [0001] The invention belongs to the safety control technology of a hybrid electric vehicle, in particular to a device and method for diagnosing a leakage fault of a high-voltage system of a hybrid electric vehicle. Background technique [0002] Due to the use of high-voltage components in hybrid electric vehicles, accidents such as car burning occasionally occur during the actual promotion and use. The safety performance of the high-voltage system directly affects the safety of the occupants and their property. At present, hybrid vehicles avoid burning cars by improving the design of parts, optimizing the protection of parts, replacing aging parts in time, and maintaining good usage habits. However, these methods only provide safety protection when the component itself fails, and do not consider leakage from the system level. During the driving process of the vehicle, there are undiagnosable leakage faults in the components themselves. Even if the parts are...

AI Technical Summary

Problems solved by technology

Even if the components are in good condition, there may still be problems such as wire harness wear, component pile heads and peripheral components short circuit, resulting in current loops formed by wire harnesses or component pile heads and peripheral devices and leakage

At present, the control system has no effective way to prevent these two types of leakage risks

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