Detection device and detection method for state of relay contact in automotive high voltage circuit

Abstract

The invention provides a relay contact state detection device capable of effectively detecting the state of a relay contact in an automotive high voltage circuit and a detection method thereof. The detection device comprises a power supply circuit, a failure predication unit, a high voltage current detection unit for detecting the current in the automotive high voltage circuit, a relay state detection unit for detecting the pull-in state of a relay and a prompt unit for prompting a failure, wherein the high voltage current detection unit is located in the automotive high voltage circuit end, the relay state detection unit is located in the relay low voltage control end and the high voltage current detection unit, the relay state detection unit and the failure prompt unit are electrically connected with the failure predication respectively. The failure predication unit determines the state of the relay contact by detecting the current in the automotive high voltage circuit and the pull-in state of the relay and reminds the driver to maintain the relay in failure in time and reduces the safety hidden trouble of the automotive.

Description

technical field [0001] The invention belongs to the field of automobile manufacture, and in particular relates to a detection device for the safety of a high-voltage circuit of a hybrid electric automobile or an electric automobile. Background technique [0002] Modern hybrid vehicles or electric vehicles partially or completely use electric energy as a power source, so they all have a high-voltage circuit. To ensure operational safety, the on-off of the high-voltage circuit is usually controlled by controlling the pull-in of the relay in the high-voltage circuit. Because the current passing through the relay is sometimes as high as hundreds of amperes, under the action of high current and high voltage, the relay is prone to arcing and other phenomena. If the relay of the above-mentioned car fails, it will cause serious consequences, such as the relay is not closed normally during normal driving. It will inevitably affect the power and fuel economy of the whole vehicle, and ...

AI Technical Summary

Problems solved by technology

Because the current passing through the relay is sometimes as high as hundreds of amperes, under the action of high current and high voltage, the relay is prone to arcing and other phenomena. If the relay of the above-mentioned car fails, it will cause serious consequences, such as the relay is not closed normally during normal driving. It will inevitably affect the power and fuel economy of the whole vehicle, and even cannot drive normally; if the relay contacts are sintered and cannot be disconnected normally, it will cause unreasonable power consumption after parking, waste electric energy, and even cause safety accidents during routine maintenance , so it is very important to detect the state of the relay in the high voltage circuit

At present, there is no detection device for detecting the state of the relay contacts, which brings certain safety hazards to hybrid electric vehicles or electric vehicles

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