DIAGNOSTIC DEVICE FOR CHECKING A CONTROL SIGNAL LINE
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Accused Products
Abstract
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, includes a first resistor disposed at the charging connection and connecting the control signal line to ground, a second resistor connected in parallel with first resistor to form a parallel circuit, an evaluation device associated with the control device and comprising a current source and/or a voltage source for supplying a corresponding current or voltage outside a charging operation, and a diode connected in series with the first and second resistors and blocking a current flow from ground to the control signal line. 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.
13 Citations
20 Claims
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1-10. -10. (canceled)
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11. 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:
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a first resistor disposed at the charging connection and connecting the control signal line to ground, a second resistor connected in parallel with first resistor to form a parallel circuit, an 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, and a diode connected in series with the first and second resistors and blocking a current flow from ground to the control signal line, 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. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A motor vehicle comprising 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:
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a first resistor disposed at the charging connection and connecting the control signal line to ground, a second resistor connected in parallel with first resistor to form a parallel circuit, an 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, and a diode connected in series with the first and second resistors and blocking a current flow from ground to the control signal line, 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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20. A method for detecting a control signal line defect of a control signal line arranged between a control device of a motor vehicle and a motor-vehicle-side charging connection for a battery of the motor vehicle, comprising:
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connecting the control signal line to ground by way of a first resistor disposed in the control device, and connecting a second resistor disposed at the charging connection side in parallel with the first resistor to form a parallel circuit, connecting a diode blocking a current flow from ground to the control signal line in series with the parallel circuit formed o the first resistor and the second resistor, feeding at least one of a voltage and a current into the circuit comprising the first and the second resistor outside a charging operation, and measuring and evaluating at another location of the circuit a voltage that depends on an availability of the second resistor or a current that depends on the availability of the second resistor with respect to the control signal line defect.
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Specification