System and method for controlling valve timing of an engine with cylinder deactivation
First Claim
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1. A method for controlling an engine having at least a first and second cylinder, the method comprising:
- operating the first cylinder with a first ignition timing and a first amount of fresh air flow; and
operating the second cylinder with a second ignition timing, more retarded than said first ignition timing, and a second amount of fresh air flow adjusted by an actuator to be different from said first amount of fresh air flow.
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Abstract
Various systems and methods are disclosed for carrying out combustion in a fuel-cut operation in some or all of the engine cylinders of a vehicle. Further, various subsystems are considered, such as fuel vapor purging, air-fuel ratio control, engine torque control, catalyst design, and exhaust system design.
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Citations
18 Claims
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1. A method for controlling an engine having at least a first and second cylinder, the method comprising:
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operating the first cylinder with a first ignition timing and a first amount of fresh air flow; and
operating the second cylinder with a second ignition timing, more retarded than said first ignition timing, and a second amount of fresh air flow adjusted by an actuator to be different from said first amount of fresh air flow. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for controlling an engine having at least a first and second cylinder, the method comprising:
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during engine starting conditions, but after engine cranking operation, operating the first group of cylinders with a first ignition timing and a first amount of fresh air flow; and
operating the second group of cylinders with a second ignition timing, more retarded than said first ignition timing, and a second amount of fresh air flow adjusted by an actuator to be different from said first amount of fresh air flow. - View Dependent Claims (8, 9)
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10. A computer readable storage medium having instructions encoded therein for controlling an engine having at least a first and second cylinder, the medium comprising:
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code for operating the first cylinder with a first ignition timing and a valve characteristic; and
code for operating the second cylinder with a second ignition timing, more retarded than said first ignition timing, and a second valve characteristic different from said first valve characteristic. - View Dependent Claims (11, 12, 13, 14, 15)
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- 16. The medium of claim is wherein said first and second valve characteristics are determined as a function of ignition timing of the respective cylinders.
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18. A method for controlling an engine having at least a fist and second cylinder, the method comprising:
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operating the engine in a first idle speed control mode with a first set-point idle speed, with at least the first cylinder operating with a first ignition timing and at least the second cylinder operating with a second ignition timing, more retarded than said first ignition timing; and
operating the engine in a second idle speed control mode with a second set-point idle speed lower than said first, with at least the first and second cylinders operating with substantially the same ignition timing.
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Specification