Method for diagnosing faults of bidirectional DC-DC converter

A fault diagnosis and converter technology, applied in the direction of instruments, measuring devices, measuring electricity, etc., can solve the problems of large fault false alarms, simple diagnosis mechanism, and insufficient guarantee of work reliability, so as to improve reliability and guarantee The effect of reliability

Active Publication Date: 2013-12-18
CHERY AUTOMOBILE CO LTD
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Problems solved by technology

Traditional DC-DC converters are rarely designed with embedded fault diagnosis. Even if fault diagnosis is designed, its diagnos

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  • Method for diagnosing faults of bidirectional DC-DC converter
  • Method for diagnosing faults of bidirectional DC-DC converter
  • Method for diagnosing faults of bidirectional DC-DC converter

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[0023] The present invention will be described in detail below with reference to the accompanying drawings.

[0024] The fault diagnosis method of the bidirectional DC-DC converter of the present invention divides faults into four types: software recoverable faults, hardware recoverable faults, software non-recoverable faults and hardware non-recoverable faults.

[0025] The software recoverable fault refers to a type of fault in which the software diagnoses the abnormal condition, reports the fault, and clears the fault when the abnormal condition disappears. Hardware recoverable fault means that a special hardware detection circuit detects abnormal conditions and sends fault information (such as a low level signal) to the corresponding I / O port of the main control chip. When the abnormal condition disappears, the hardware detection circuit sends no fault information. (such as high-level signal) to the corresponding I / O port of the main control chip, the main control chip can...

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Abstract

The invention discloses a method for diagnosing faults of a bidirectional DC-DC converter applied to a new energy automobile power system. The method comprises recoverable software fault diagnosis, hardware recoverable fault diagnosis, software unrecoverable fault diagnosis and hardware unrecoverable fault diagnosis, wherein abnormal conditions are diagnosed through the recoverable software fault diagnosis and the hardware recoverable fault diagnosis, the faults are reported, and after the abnormal conditions disappear, the faults are removed; abnormal conditions are diagnosed through the software unrecoverable fault diagnosis and the hardware unrecoverable fault diagnosis, the faults are reported, and after the abnormal conditions disappear, the faults are not removed immediately. The bidirectional DC-DC converter monitors the states of the current, the voltage, the temperature, the CAN information and the IGBT power tube of the bidirectional DC-DC converter in real time, the corresponding faults are reported once the abnormal conditions occur, the working reliability of the bidirectional DC-DC converter can be guaranteed, and therefore the reliability of the power system is improved.

Description

technical field [0001] The invention relates to the technical field of new energy vehicles, in particular to a fault diagnosis method for bidirectional DC-DC converters in new energy vehicles. Background technique [0002] The bidirectional DC-DC converter is an important part of the power system of new energy vehicles. It can stabilize the output voltage in the case of input voltage fluctuations. Because the positive boost boosts the voltage, it can reduce the loss of the motor. When the vehicle brakes Energy recovery can be achieved by reverse step-down. In order to ensure the reliability of the bidirectional DC-DC converter, fault diagnosis is particularly important. Traditional DC-DC converters are rarely designed with embedded fault diagnosis. Even if fault diagnosis is designed, its diagnosis mechanism is too simple, the possibility of false alarm is high, and its working reliability cannot be effectively guaranteed. Contents of the invention [0003] The present i...

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Application Information

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IPC IPC(8): G01R31/00
Inventor 王瑛
Owner CHERY AUTOMOBILE CO LTD
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