Importance

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Abstract

A motor vehicle with an electric motor, in particular a hybrid or electric vehicle, has a high-voltage vehicle electrical system with a high-voltage stored energy source which supplies electrical energy to the electric motor for driving the motor vehicle, and a low-voltage vehicle electrical system for supplying electricity to a number of consumers in the motor vehicle. An electrical signal path is provided between the low-voltage vehicle electrical system and the high-voltage vehicle electrical system and powered by the voltage from the low-voltage vehicle electrical system. A controller in the motor vehicle is configured to cause a predetermined change of the signal on the signal path from a first signal state to a second signal state, wherein the first signal state indicates normal operation of the motor vehicle and the second signal state indicates an emergency state of operation of the motor vehicle which deviates from normal operation. The high-voltage vehicle electrical system is designed to separate the high-voltage stored energy source from the high-voltage vehicle electrical system in response to the predetermined signal change. The signal path includes a first and a second signal line, wherein the predetermined change of the signal on the signal path includes a change of the signal level on each of the first and second signal lines.

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First Claim