ENGINE CONTROLLER
First Claim
1. An engine controller comprising an oxygen concentration sensor, which is located in an exhaust passage and detects oxygen concentration of exhaust gas, and learning means, which executes a learning process for determining whether ambient air in the vicinity of the oxygen concentration sensor in the exhaust passage has become equal to the oxygen concentration of atmospheric air as a fuel cut-off operation is executed, and storing, as a learned value, a detection value of the oxygen concentration sensor at the time when the ambient air in the vicinity of the oxygen concentration sensor is determined to be equal to the atmospheric state, wherein the learning means corrects a detection value of the oxygen concentration sensor based on the learned value,wherein the learning means continues the learning process until a predetermined time period set based on an exhaust gas transport delay elapses from when the fuel cut-off operation is terminated.
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Accused Products
Abstract
An electronic control unit 50 determines whether the ambient air in the vicinity of an oxygen concentration sensor 55 in an exhaust passage 30 has become equal to the atmospheric state as a fuel cut-off operation is executed. If the ambient air in the vicinity of the oxygen concentration sensor 55 is equal to the atmospheric state, the electronic control unit 50 executes a learning process, in which a detection value C of the oxygen concentration sensor 55 is stored as a learned value Cstd in a memory 56. The electronic control unit 50 continues the learning process until a predetermined time period set based on an exhaust gas transport delay elapses from when the fuel cut-off operation is terminated.
28 Citations
7 Claims
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1. An engine controller comprising an oxygen concentration sensor, which is located in an exhaust passage and detects oxygen concentration of exhaust gas, and learning means, which executes a learning process for determining whether ambient air in the vicinity of the oxygen concentration sensor in the exhaust passage has become equal to the oxygen concentration of atmospheric air as a fuel cut-off operation is executed, and storing, as a learned value, a detection value of the oxygen concentration sensor at the time when the ambient air in the vicinity of the oxygen concentration sensor is determined to be equal to the atmospheric state, wherein the learning means corrects a detection value of the oxygen concentration sensor based on the learned value,
wherein the learning means continues the learning process until a predetermined time period set based on an exhaust gas transport delay elapses from when the fuel cut-off operation is terminated.
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7. (canceled)
Specification