High-voltage interlocking detection method and system

Abstract

The embodiment of the invention relates to the field of new energy automobile safety protection, and discloses a high-voltage interlocking detection method and system. The method is applied to a high-voltage interlocking detection circuit which comprises a high-voltage connector and a detection circuit, wherein the detection circuit comprises a processing unit, a signal collection unit, a pull-upresistor, a pull-down resistor, a first sampling path and a second sampling path; the first low-voltage connection end of the high-voltage connector is independently connected with the first samplingpath and the pull-up resistor; the pull-up resistor is also connected with a power supply unit; the second low-voltage connection end of the high-voltage connector is independently connected with thepull-down resistor and the second sampling path; and the processing unit is connected with the first sampling point of the first sampling path and the second sampling point of the second sampling paththrough the signal connection unit, and the connection state of the high-voltage connector can be determined through the voltage of the first sampling point and the voltage of the second sampling point. The implementation way of the invention configures a corresponding circuit detection scheme for each high-voltage connector, and the problem of a specific high-voltage connector can be positioned.

Description

technical field [0001] The embodiments of the present invention relate to the field of safety protection of new energy vehicles, and in particular to a high-voltage interlock detection method and system. Background technique [0002] With the increasingly serious environmental pollution, the market demand for new energy vehicles continues to expand, and the requirements for new energy vehicle technology are becoming increasingly stringent, especially the safety performance of new energy vehicles. The high-voltage connector (high-voltage maintenance switch) is a key component that controls the on-off of the high-voltage circuit, and its connection status directly affects the charging and driving functions of the car. Therefore, the installation and detection of the high-voltage connector becomes very important. [0003] In the prior art, a high-voltage interlock detection method is generally used to detect the connection state of the high-voltage connector. However, the exis...

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Problems solved by technology

The inventors of the present invention have found that this detection method has at least the following problems: (1) The high-voltage interlock detection system connects all high-voltage connectors in series with failure prevention resistors through the low-voltage detection harness. When an abnormality occurs, it is impossible to locate the specific high-voltage Connectors; this problem is especially serious on electric buses with multiple electrical boxes (each electrical box has a high-voltage connector), which will lead to an increase in after-sales maintenance costs; If the low-voltage detection harness is connected in series, it will lead to problems such as too long low-voltage detection harness, too many segments (too many connections), etc. If the low-voltage detection harness is too long and too many connections, the introduced impedance will increase. The detection method formulated for the resistance value of the failure resistor will cause uncertain effects, which will reduce the reliability of the detection system

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