Idle speed control for lean burn engine with variable-displacement-like characteristic
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Accused Products
Abstract
A method is disclosed for controlling operation of a engine coupled to an exhaust treatment catalyst. Under predetermined conditions, the method operates an engine with a first group of cylinders combusting a lean air-fuel mixture and a second group of cylinders pumping air only (i.e. without fuel injection.) In addition, the engine control method also provides the following features in combination with the above-described split air/lean mode: auto speed control, sensor diagnostics, air-fuel ratio control, adaptive learning, fuel vapor purging, catalyst temperature estimation, and default operation. In addition, the engine control method also disables the split air/lean operating mode under preselected operating conditions.
102 Citations
38 Claims
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1-21. -21. (cancelled).
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22. A method for controlling an engine having a first and second group of combustion chambers, the engine also having an electronically controlled throttle plate controlling airflow to at least said first and second group, comprising:
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inducting air and injecting fuel into the first combustion chamber group at a first average air-fuel ratio;
inducting air and not injecting fuel into the second combustion chamber group; and
adjusting said injected fuel to the first combustion chamber group and the throttle plate based on a desired engine torque so that an actual speed approaches a desired speed. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30)
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31. A method for controlling an engine having first and second groups of combustion chambers and an electronically controlled throttle plate in an intake of said engine, comprising:
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operating the engine in a first operating mode where air and substantially no injected fuel is provided to the first combustion chamber group, and both air and injected fuel are provided to the second combustion chamber group, and injected fuel is adjusted to the second combustion chamber group and the throttle plate is adjusted to vary engine torque so that a determined actual speed approaches a desired speed; and
operating the engine in a second mode where both air and injected fuel are provided to both the first and second combustion chamber groups, and said air and said injected fuel provided to both said first and second combustion group is adjusted to vary engine torque so that said determined actual speed approaches said desired speed. - View Dependent Claims (32, 33, 34, 35, 36)
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37. A method for controlling a vehicle having an engine having first and second groups of combustion chambers, the engine having an electronically controlled throttle plate, the method comprising:
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during at least some operation in a speed control condition;
inducting air and injecting fuel into the first group of combustion chambers, inducting air and injecting substantially no fuel into the second group of combustion chambers, and adjusting said injected fuel to the first combustion chamber group and the throttle plate so that a determined speed approaches said desired speed; and
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during at least some operation in a preselected condition other than said speed control condition;
determining a desired engine output torque based on a driver actuated element and adjusting at least one of fuel injected or air inducted to both cylinder groups based on said desired engine output torque. - View Dependent Claims (38)
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Specification