Control Device for a Motor Vehicle
First Claim
1. A control device for a vehicle, the control device comprising:
- a microcontroller being clocked by a first clock signal and having at least one reset input, a diagnostic trigger input, and a diagnostic output; and
a monitoring circuit connected to and monitoring said microcontroller, said monitoring circuit having a counter clocked by a second clock signal, said counter having at least one reset input, a first counter output of a lower weight and a second counter output of a higher weight being higher than said lower weight, said reset input of said counter being coupled to said diagnostic output of said microcontroller, said first counter output being coupled to said diagnostic trigger input of said microcontroller and said second counter output being coupled to said reset input of said microcontroller such that when said microcontroller functions correctly, a signal at said first counter output triggers a diagnostic process of said microcontroller and a signal at said diagnostic output of said microcontroller resets said counter, however, when said microcontroller malfunctions, said counter is not reset and continues to count and generates a signal for resetting said microcontroller at said second counter output.
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Accused Products
Abstract
A control device for a motor vehicle has a microcontroller as well as a monitoring circuit for the microcontroller. The monitoring circuit has a clocked counter, with a reset input of counter being coupled to a diagnostic output of the microcontroller, a first counter output being coupled to a diagnostic trigger input of the microcontroller and a second counter output being coupled to a reset input of the microcontroller such that when the microcontroller functions correctly, a signal at the first counter output generates a diagnostic process of the microcontroller and a signal at the diagnostic output of the microcontroller resets the counter. However, when the microcontroller malfunctions, the counter is not reset, so that the counter continues to count and generates a signal for resetting the microcontroller at the second counter output.
13 Citations
11 Claims
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1. A control device for a vehicle, the control device comprising:
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a microcontroller being clocked by a first clock signal and having at least one reset input, a diagnostic trigger input, and a diagnostic output; and a monitoring circuit connected to and monitoring said microcontroller, said monitoring circuit having a counter clocked by a second clock signal, said counter having at least one reset input, a first counter output of a lower weight and a second counter output of a higher weight being higher than said lower weight, said reset input of said counter being coupled to said diagnostic output of said microcontroller, said first counter output being coupled to said diagnostic trigger input of said microcontroller and said second counter output being coupled to said reset input of said microcontroller such that when said microcontroller functions correctly, a signal at said first counter output triggers a diagnostic process of said microcontroller and a signal at said diagnostic output of said microcontroller resets said counter, however, when said microcontroller malfunctions, said counter is not reset and continues to count and generates a signal for resetting said microcontroller at said second counter output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification