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Diagnostic device for checking a control signal line

  • US 9,372,218 B2
  • Filed: 06/21/2013
  • Issued: 06/21/2016
  • Est. Priority Date: 08/10/2012
  • Status: Active Grant
First Claim
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1. A diagnostic device for checking a control signal line between a control device of a motor vehicle and a motor-vehicle-side charging connection for a battery of the motor vehicle, comprising:

  • a first resistor disposed in the control device and connecting a first end of the control signal line to ground,a second resistor disposed in the motor-vehicle-side charging connection and having one terminal connected to ground and another terminal connected to a second end of the control signal line,a first diode connected in series with the first resistor and blocking a current flow from ground to the first end of the control signal line,a second diode connected in series with the second resistor and blocking a current flow from ground to the second end of the control signal line,wherein the series connection of the first resistor and the first diode and the series connection of the second resistor and the second diode form a parallel circuit, andan evaluation device associated with the control device and comprising at least one of a current source and a voltage source for supplying a corresponding current or voltage outside a charging operation,wherein the evaluation device is configured to measure, by using the first and second resistor, a current indicating a control signal line defect or a voltage indicating a control signal line defect.

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