Engine control system and engine control method
First Claim
1. An engine control system for controlling an engine having an intake air system through which air is drawn, a fuel injection valve for performing fuel injection to supply fuel into a combustion chamber, and a crankcase filled with engine oil, the engine control system comprising:
- detecting means for detecting at least one of an output of the engine and a status correlated to the output to provide a detected value;
calculating means for calculating a combustible component quantity of intake air, resulting from combustible components prevailing in the crankcase, on the basis of the detected value and providing a commanded fuel injection quantity depending on the detected value; and
controlling means for controlling the fuel injection valve depending on the commanded fuel injection quantity so as to perform the fuel inject to supply fuel into the combustion chamber to allow the engine to provide a demanded output;
wherein the calculating means includes fuel injection affect eliminating means for eliminating an adverse affect on the calculation result of the combustible component quantity resulting from fuel injected to the combustion chamber by the fuel injection valve in response to the commanded fuel injection quantity.
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Accused Products
Abstract
An engine control system and an engine control method are disclosed wherein a combustible component quantity of intake air, reflecting combustible components in a crankcase of an engine, is calculated on the basis of a deviation between basic injection quantity for a target rotational speed to be attained and an actual injection quantity during operation to perform idling stabilizing control. A ratio of the combustible components mixed to engine oil is calculated on the basis of the combustible component quantity of intake air and a temperature of engine oil. During a status of the engine with a given temperature of engine oil and the mixing ratio of the combustible components in engine oil, a fuel injection affect eliminating operation is executed.
45 Citations
33 Claims
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1. An engine control system for controlling an engine having an intake air system through which air is drawn, a fuel injection valve for performing fuel injection to supply fuel into a combustion chamber, and a crankcase filled with engine oil, the engine control system comprising:
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detecting means for detecting at least one of an output of the engine and a status correlated to the output to provide a detected value;
calculating means for calculating a combustible component quantity of intake air, resulting from combustible components prevailing in the crankcase, on the basis of the detected value and providing a commanded fuel injection quantity depending on the detected value; and
controlling means for controlling the fuel injection valve depending on the commanded fuel injection quantity so as to perform the fuel inject to supply fuel into the combustion chamber to allow the engine to provide a demanded output;
wherein the calculating means includes fuel injection affect eliminating means for eliminating an adverse affect on the calculation result of the combustible component quantity resulting from fuel injected to the combustion chamber by the fuel injection valve in response to the commanded fuel injection quantity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of controlling an engine having an intake air system through which air is drawn, a fuel injection valve for performing fuel injection to supply fuel into a combustion chamber, and a crankcase filled with engine oil, the method comprising the steps of:
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detecting at least one of an output of the engine and a status correlated to the output to provide a detected value;
calculating a combustible component quantity of intake air, resulting from combustible components prevailing in the crankcase, on the basis of the detected value and providing a commanded fuel injection quantity depending on the detected value; and
controlling the fuel injection valve depending on the commanded fuel injection quantity so as to perform the fuel inject to supply fuel into the combustion chamber to allow the engine to provide a demanded output;
wherein the step of calculating the combustible component quantity includes eliminating a fuel injection adverse affect on the calculation result of the combustible component quantity resulting from fuel injected to the combustion chamber by the fuel injection valve in response to the commanded fuel injection quantity. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. An engine control system for controlling an engine having an intake air system through which air is drawn, a fuel injection valve for performing fuel injection to supply fuel into a combustion chamber, and a crankcase filled with engine oil, the engine control system comprising:
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a sensor for detecting operating parameters of the engine to provide detected values;
a calculating section for calculating a combustible component quantity of intake air, resulting from combustible components prevailing in the crankcase, on the basis of a deviation between a commanded injection quantity and a basic injection quantity to provide a calculation result on the commanded fuel injection quantity;
a fuel injection affect eliminating section for calculating a ratio of combustible components in engine oil on the basis of one of the detected value related to a temperature of the engine oil for thereby providing a mixing ratio of combustible components in engine oil;
a judging section for making judgment whether or not the mixing ratio of combustible components and the temperature of engine oil belong to an engine performance upgrading zone and providing an output if judgment is made that the mixing ratio of combustible components and the temperature of engine oil belong to the engine performance upgrading zone; and
an electronic control unit for controlling the fuel injection valve in response to the output to suppress an increase of the combustible components mixed to the engine oil.
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Specification