Monitoring of exhaust gas limiting values
First Claim
1. A method for monitoring an exhaust gas limiting value of an internal combustion engine using an engine controller, the engine controller having at least one exhaust gas sensor, comprising:
- ascertaining a predicted emission for a present driving state with the aid of an engine model;
comparing the predicted emission to one of a signal of the exhaust gas sensor and a comparison value of an emission, the comparison value derived from the signal of the exhaust gas sensor;
determining, based on the comparing, whether the exhaust gas limiting value has been exceeded; and
outputting an error signal responsive to the determination being that the exhaust gas limiting value has been exceeded.
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Accused Products
Abstract
In a method for monitoring an exhaust gas limiting value of an internal combustion engine using an engine controller, the engine controller has at least one exhaust gas sensor, and an error signal is output when the exhaust gas limiting value is exceeded. If the emissions predicted for the present driving state are ascertained with the aid of an engine model and compared to the signal of the exhaust gas sensor or a comparison value for the emission derived therefrom, the prescribed driving cycle may be taken into account when certifying a limiting value monitoring system and a defective system may be reliably recognized in practical operation even in atypical driving states without resulting in erroneous triggering of error signals.
6 Citations
14 Claims
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1. A method for monitoring an exhaust gas limiting value of an internal combustion engine using an engine controller, the engine controller having at least one exhaust gas sensor, comprising:
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ascertaining a predicted emission for a present driving state with the aid of an engine model; comparing the predicted emission to one of a signal of the exhaust gas sensor and a comparison value of an emission, the comparison value derived from the signal of the exhaust gas sensor; determining, based on the comparing, whether the exhaust gas limiting value has been exceeded; and outputting an error signal responsive to the determination being that the exhaust gas limiting value has been exceeded. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for monitoring an exhaust gas limiting value of an internal combustion engine using an engine controller, the engine controller having at least one exhaust gas sensor, comprising:
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ascertaining a predicted emission for a present driving state with the aid of an engine model; comparing the predicted emission to one of a signal of the exhaust gas sensor and a comparison value of an emission, the comparison value calculated as a difference between the predicted emission and the signal of the exhaust gas sensor; determining, based on the comparing, whether the exhaust gas limiting value has been exceeded; and responsive to the determination being that the exhaust gas limiting value has been exceeded, outputting, by an indicator lamp, an error signal.
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14. A method for monitoring an exhaust gas limiting value of an internal combustion engine using an engine controller, the engine controller having at least one exhaust gas sensor, comprising:
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ascertaining a predicted emission for a present driving state with the aid of an engine model; comparing the predicted emission to one of a signal of the exhaust gas sensor and a comparison value of an emission, the comparison value calculated by multiplying the signal of the exhaust gas sensor by an exhaust gas volume flow value; determining, based on the comparing, whether the exhaust gas limiting value has been exceeded; and responsive to the determination being that the exhaust gas limiting value has been exceeded, outputting, by an indicator lamp, an error signal.
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Specification