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 supply module (1) interrupting the functions of the control unit components via a RESET line (7) upon a fault being detected in the voltages generated by a supply module (1) in the control unit, the voltages being monitored for faults via bands (19, 20) and specified values (18), wherein a test of the RESET line (7) of the control unit is initiated, the supply module (1) then interrupting the functions of the components over the RESET line (7) for a predefined time period using periodic pulses, and a processor (2) counting the time between the interrupts to monitor the operation of the RESET line (7).
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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
11 Claims
- 1. A method of monitoring a voltage supply of a control unit in a motor vehicle, the supply module (1) interrupting the functions of the control unit components via a RESET line (7) upon a fault being detected in the voltages generated by a supply module (1) in the control unit, the voltages being monitored for faults via bands (19, 20) and specified values (18), wherein a test of the RESET line (7) of the control unit is initiated, the supply module (1) then interrupting the functions of the components over the RESET line (7) for a predefined time period using periodic pulses, and a processor (2) counting the time between the interrupts to monitor the operation of the RESET line (7).
Specification