Default mode for lean burn engine
First Claim
1. A multi-cylinder group engine system operable in at least a first mode and a second mode, where in the first mode a first and second cylinder group combust air and fuel with a lean air-fuel ratio, and where in the second mode at least one of the first and second cylinder groups combusts air and fuel and the other one of the first and second cylinder groups pumps air without injected fuel, the engine system comprising:
- a fuel injection activity sensor coupled to each cylinder in the first and second cylinder groups;
a exhaust gas sensor disposed in an exhaust passage to measure air fuel exhausted from the engine; and
a controller configured to transition out of the first mode responsive to detection of exhaust gas sensor degradation and to transition out of the second mode responsive to detection of fuel injection sensor degradation.
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Accused Products
Abstract
A multi-cylinder group engine system operable in at least a first mode and a second mode, where in the first mode a first and second cylinder group combust air and fuel with a lean air-fuel ratio, and where in the second mode at least one of the first and second cylinder groups combusts air and fuel and the other one of the first and second cylinder groups pumps air without injected fuel, the engine system comprising of a fuel injection activity sensor coupled to each cylinder in the first and second cylinder groups; a exhaust gas sensor disposed in an exhaust passage to measure air fuel exhausted from the engine; and a controller configured to transition out of the first mode responsive to detection of exhaust gas sensor degradation and to transition out of the second mode responsive to detection of fuel injection sensor degradation. In one example, the transition out of the second mode may be slower than the transition out of the first mode in response to the respective degradation.
54 Citations
20 Claims
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1. A multi-cylinder group engine system operable in at least a first mode and a second mode, where in the first mode a first and second cylinder group combust air and fuel with a lean air-fuel ratio, and where in the second mode at least one of the first and second cylinder groups combusts air and fuel and the other one of the first and second cylinder groups pumps air without injected fuel, the engine system comprising:
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a fuel injection activity sensor coupled to each cylinder in the first and second cylinder groups;
a exhaust gas sensor disposed in an exhaust passage to measure air fuel exhausted from the engine; and
a controller configured to transition out of the first mode responsive to detection of exhaust gas sensor degradation and to transition out of the second mode responsive to detection of fuel injection sensor degradation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 14)
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10. A multi-cylinder group engine system operable in at least a first mode and a second mode, where in the first mode at least one of the first and second cylinder groups combusts air and fuel and the other one of the first and second cylinder groups pumps air without injected fuel, and where in the second mode a first and second cylinder group combust air and fuel, the engine system comprising:
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a fuel injection activity sensor coupled to each of the first and second cylinder groups; and
a controller transitions from the first mode to the second mode in response to a driver request at a first transition rate under a first condition, and transitions from the first mode to the second mode in response to degradation of the fuel injection activity sensor at a second transition rate slower than the first transition rate under a second condition. - View Dependent Claims (11, 12, 13)
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15. A method of engine control in a multi-cylinder group engine system with an asymmetric sensor configuration, the method comprising:
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transitioning out of a partial fuel injector cut-out mode of engine operation responsive to detection of fuel injection system degradation;
transitioning out of a lean mode of engine operation responsive to detection of linear exhaust gas sensor degradation; and
transitioning out of a decontamination mode of engine operation responsive to detection of linear exhaust gas sensor degradation. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification