Electric vehicle loop interlocking circuit and diagnosis method thereof

Abstract

The invention aims to provide an electric vehicle loop interlocking circuit and a diagnosis method thereof, which are used for quickly locking a fault point in an electric vehicle loop interlocking protection circuit so as to reduce the maintenance cost and improve the maintenance efficiency. The electric vehicle loop interlocking circuit is composed of an interlocking signal sending module, an interlocking signal receiving module, a plurality of interlocking switches used for detecting the state of a high-voltage component, and connecting resistors corresponding to the interlocking switches in number. The corresponding interlocking switches and the connecting resistors are connected in series to form branches, all the branches are connected in parallel to form a parallel circuit, one endof the parallel circuit is connected with the interlocking signal sending module, and the other end of the parallel circuit is connected with the interlocking signal receiving module; and the resistance values of the connecting resistors on the branches are different. According to the interlocking circuit and the diagnosis method thereof, the fault position can be quickly and accurately locked, maintenance personnel can conveniently check faults, after-sales cost is effectively reduced, and safety risks are avoided.

Description

technical field [0001] This patent relates to the technical field of high-voltage safety of electric vehicles, in particular to a loop interlock circuit. Background technique [0002] Electric vehicles use high-voltage electric energy as the source of power supply. When the high-voltage plug-in is unplugged, high-voltage electricity will be present at both ends of the plug-in, which poses a risk of electric shock. At present, in terms of high-voltage safety protection of electric vehicles, some vehicles are designed with a loop interlock protection scheme. The function of the loop interlock is to detect the real-time status of the high-voltage connector and the high-voltage component housing, so as to prevent personnel from being connected when the connector is not mated. Or when the shell is removed during maintenance, there is a risk of electric shock caused by accidentally touching the high-voltage circuit. Most of its protection strategies are relatively simple. The exi...

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Problems solved by technology

[0003] The above solution is likely to bring the following problems: there are many high-voltage components in electric vehicles, and there are even more than 4 high-voltage and low-voltage connectors on some high-voltage components, and there are many series points. When an abnormal fault occurs, the specific fault cause and fault point Difficult to troubleshoot, resulting in very high after-sales maintenance costs

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