Fault positioning circuit and positioning method for high voltage loop interlocking

Abstract

The invention discloses a fault positioning circuit and positioning method for a high voltage loop interlocking. The circuit comprises a potential detecting circuit and a main controller, wherein thepotential detecting circuit sends a potential signal at the front end and the rear end of an interlocking switch of the detected high voltage component to the main controller, and the main controllerdetermines whether the high voltage component corresponding to the interlocking switch interlocks normally and / or an interlocking fault position according to the potential signal at the front end andthe rear end of the interlocking switch. The fault positioning circuit and positioning method for the high voltage loop interlocking has the advantages that the fault position can be quickly positioned after an interlocking fault occurs by determining whether the high voltage component is faulty and the position of the fault relative to the high voltage component according to the potential signalat the front end and the rear end of the interlocking switch of the high voltage component, so that the maintenance can be facilitated, the time and cost of manual troubleshooting are saved, and the troubleshooting efficiency can be greatly improved.

Description

technical field The invention relates to the field of automobile fault detection, in particular to an automobile high-voltage loop interlock fault location circuit and a location method. Background technique With the rapid development of the Xinyuan automobile industry, the voltage level of electric vehicles is also getting higher and higher. At present, the DC bus voltage of mainstream electric vehicles is mostly around 300-400 volts. There are also many high-voltage components on electric vehicles, including charging systems, high-voltage power distribution boxes, energy storage systems (power batteries), electric drive systems, DCDC, air-conditioning compressors, and PTCs. As a result, there are more and more hidden dangers of high-voltage damage, and high-voltage loop interlocking is one of the important measures for electric vehicle high-voltage safety. The high-voltage interlock circuit is to check the electrical integrity (continuity) of the high-voltage components,...

AI Technical Summary

Problems solved by technology

However, once the loop interlock fault is reported, it is very troublesome to troubleshoot the fault point, because there are so many components, connectors and connecting wires, any point disconnection will report a fault, and it needs to be checked one by one, which is time-consuming and labor-intensive.

Later, a large loop on the car was divided into the main discharge loop, the high-voltage accessory loop, and the fast and slow charging loop to reduce the scope of the loop. This can narrow the scope of investigation, but it still requires energy to troubleshoot the fault point and cannot accurately locate the fault. point

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