Robust maximum engine torque estimation
First Claim
1. A system for a vehicle comprising:
- an engine including a first cylinder group and a second cylinder group;
a linear exhaust gas sensor coupled exclusively to the first cylinder group;
a switching exhaust gas sensor coupled exclusively to the second cylinder group; and
a controller configured to operate the engine in at least a first mode and a second mode, where in the first mode the first and second cylinder groups combust air and fuel, where in the second mode at least one of the first and second cylinder groups combusts air and injected fuel and the other one of the first and second cylinder groups pumps air without injecting fuel, and where the controller is further configured to estimate torque of the engine in each of the first and second modes of operation based on the air-fuel ratio of the first cylinder group and the air-fuel ratio of the second cylinder group independent of the switching sensor and dependent on the linear sensor.
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Accused Products
Abstract
A system for a vehicle comprising of an engine including a first cylinder group and a second cylinder group; a linear exhaust gas sensor coupled exclusively to the first cylinder group; a switching exhaust gas sensor coupled exclusively to the second cylinder group; and a controller configured to operate the engine in at least a first mode and a second mode, where in the first mode the first and second cylinder groups combust air and fuel, where in the second mode at least one of the first and second cylinder groups combusts air and injected fuel and the other one of the first and second cylinder groups pumps air without injecting fuel, and where the controller is further configured to estimate torque of the engine in each of the first and second modes of operation based on the air-fuel ratio of the first cylinder group and the air-fuel ratio of the second cylinder group independent of the switching sensor and dependent on the linear sensor.
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Citations
20 Claims
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1. A system for a vehicle comprising:
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an engine including a first cylinder group and a second cylinder group;
a linear exhaust gas sensor coupled exclusively to the first cylinder group;
a switching exhaust gas sensor coupled exclusively to the second cylinder group; and
a controller configured to operate the engine in at least a first mode and a second mode, where in the first mode the first and second cylinder groups combust air and fuel, where in the second mode at least one of the first and second cylinder groups combusts air and injected fuel and the other one of the first and second cylinder groups pumps air without injecting fuel, and where the controller is further configured to estimate torque of the engine in each of the first and second modes of operation based on the air-fuel ratio of the first cylinder group and the air-fuel ratio of the second cylinder group independent of the switching sensor and dependent on the linear sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system for a vehicle comprising:
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an engine including a first cylinder group and a second cylinder group;
a linear exhaust gas sensor coupled exclusively to the first cylinder group;
a switching exhaust gas sensor coupled exclusively to the second cylinder group; and
a controller configured to operate the engine in at least a first mode and a second mode, where in the first mode the first and second cylinder groups combust air and fuel, where in the second mode at least one of the first and second cylinder groups combusts air and injected fuel and the other one of the first and second cylinder groups pumps air without injecting fuel; and
wherein the controller is further configured to estimate torque of the engine based on air-fuel ratios of the first and second cylinder groups, wherein the air-fuel ratio of the first cylinder group is the less lean air-fuel ratio of a commanded air-fuel ratio and an air-fuel ratio measured by the linear exhaust gas sensor independent of the switching exhaust gas sensor in a mode of operation where the first cylinder group is combusting air and fuel and the linear exhaust gas sensor measures an air-fuel ratio lean of stoichiometry. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A system for a vehicle comprising:
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an engine including a first cylinder group and a second cylinder group;
a linear exhaust gas sensor coupled exclusively to the first cylinder group;
a switching exhaust gas sensor coupled exclusively to the second cylinder group; and
a controller configured to operate the engine in at least a first mode, a second mode, and a third mode, where in the first mode the first and second cylinder groups combust air and fuel with an air fuel ratio lean of stoichiometry, where in the second mode the first and second cylinder groups combust air and fuel and at least one of the first and second cylinder groups operates with an air-fuel ratio lean of stoichiometry and the other one of the at least one of the first and second cylinder groups operates with an air-fuel ratio rich of stoichiometry, where in the third mode at least one of the first and second cylinder groups combusts air and injected fuel and the other one of the first and second cylinder groups pumps air without injecting fuel, and where the controller is further configured to estimate torque of the engine in each of the first, second and third modes operation based on the air-fuel ratio of the first cylinder group and the air-fuel ratio of the second cylinder group, where in the first mode the air-fuel ratio of the first and second cylinder groups is the less lean air-fuel ratio of the commanded air-fuel ratio and an air-fuel ratio measured by the linear sensor, where in the second mode the air-fuel ratio of the first cylinder group is the less lean air-fuel ratio of the commanded air-fuel ratio and an air-fuel ratio measured by the linear exhaust sensor and the air-fuel ratio of the second cylinder group is assumed to be stoichiometric, where in the third mode the air-fuel ratio of the first cylinder group is the less lean air-fuel ratio of the commanded air-fuel ratio and an air-fuel ratio measured by the linear exhaust sensor when the first cylinder group is combusting air and injected fuel. - View Dependent Claims (17, 18, 19, 20)
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Specification