Method for monitoring a power supply of a control unit in a motor vehicle
First Claim
1. A method of monitoring a voltage supply of a control unit in a motor vehicle, the method comprising:
- interrupting a function of a component of the control unit over a RESET line upon detecting a fault in voltages generated by the supply module in the control unit, the interrupting being performed by using the supply module;
monitoring the voltages for the fault via bands and values;
initiating a test of the RESET line of the control unit;
interrupting, via the supply module, the function of the component over the RESET line for a predefined time period using periodic pulses; and
counting, via a processor, a time between interrupts to monitor an operation of the RESET line.
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Accused Products
Abstract
In a method of monitoring a voltage supply of a control unit in a motor vehicle, a supply module which provides the voltages is connected to the components of the control unit via a RESET line and the RESET line is tested every time the control unit is started or all monitoring limits of the supply module show no fault again after the faults of the monitored voltages have been filtered. This test occurs by forced periodic pulses which are generated on the basis of a shift in the limits of the monitoring bands of the supply voltages. The reference voltages VREGUL and VREF are kept independent of each other here in order to prevent system perturbations.
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Citations
10 Claims
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1. A method of monitoring a voltage supply of a control unit in a motor vehicle, the method comprising:
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interrupting a function of a component of the control unit over a RESET line upon detecting a fault in voltages generated by the supply module in the control unit, the interrupting being performed by using the supply module;
monitoring the voltages for the fault via bands and values;
initiating a test of the RESET line of the control unit;
interrupting, via the supply module, the function of the component over the RESET line for a predefined time period using periodic pulses; and
counting, via a processor, a time between interrupts to monitor an operation of the RESET line. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A control unit comprising:
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a RESET line;
a supply module connected to a component of the control unit via the RESET line, to supply the component with required voltages;
a processor to perform the following;
interrupting a function of a component of the control unit over the RESET line upon detecting a fault in the required voltages, the interrupting being performed by the supply module;
monitoring the voltages for the fault via bands and values;
initiating a test of the RESET line of the control unit;
interrupting, via the supply module, the function of the component over the RESET line for a predefined time period using periodic pulses; and
counting, via a processor, a time between interrupts to monitor an operation of the RESET line. - View Dependent Claims (8, 9, 10)
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Specification