Control system and method and engine control unit for compression ignition internal combustion engine
First Claim
1. A control system for a compression ignition internal combustion engine, for causing a mixture supplied to the engine to burn within a combustion chamber by self-ignition, comprising:
- operating condition-detecting means for detecting operating conditions of the engine;
residual combustion gas amount-determining means for determining an amount of residual combustion gas depending on the detected operating conditions of the engine;
combustion gas retention means for retaining part of combustion gas in the combustion chamber after combustion, based on the determined amount of residual combustion gas;
supercharging means for supercharging fresh air flowing to the combustion chamber;
supercharging execution-judging means for judging, based on the detected operating conditions of the engine, whether or not the supercharging by said supercharging means should be executed so as to cause self-ignition; and
supercharging control means for causing said supercharging means to supercharge the fresh air flowing to the combustion chamber when it is judged by said supercharging execution-judging means that the supercharging should be executed.
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Accused Products
Abstract
A control system for a compression ignition internal combustion engine is provided which is capable of expanding a region for executing compression ignition, on the low-load side, while positively obtaining a required power output from the engine. The amount of residual combustion gas is determined depending on operating conditions of the engine, and based on the determined amount of residual combustion gas, part of combustion gas is retained in each combustion chamber after combustion. It is judged whether or not supercharging of fresh air should be executed for self-ignition, based on the operating conditions of the engine, and when it is judged that the supercharging should be executed, supercharging of fresh air flowing to the combustion chamber is executed.
38 Citations
15 Claims
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1. A control system for a compression ignition internal combustion engine, for causing a mixture supplied to the engine to burn within a combustion chamber by self-ignition, comprising:
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operating condition-detecting means for detecting operating conditions of the engine;
residual combustion gas amount-determining means for determining an amount of residual combustion gas depending on the detected operating conditions of the engine;
combustion gas retention means for retaining part of combustion gas in the combustion chamber after combustion, based on the determined amount of residual combustion gas;
supercharging means for supercharging fresh air flowing to the combustion chamber;
supercharging execution-judging means for judging, based on the detected operating conditions of the engine, whether or not the supercharging by said supercharging means should be executed so as to cause self-ignition; and
supercharging control means for causing said supercharging means to supercharge the fresh air flowing to the combustion chamber when it is judged by said supercharging execution-judging means that the supercharging should be executed. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of controlling a compression ignition internal combustion engine, to cause a mixture supplied to the engine to burn within a combustion chamber by self-ignition, comprising:
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a detecting step of detecting operating conditions of the engine;
a determining step of determining an amount of residual combustion gas depending on the detected operating conditions of the engine;
a retaining step of retaining part of combustion gas in the combustion chamber after combustion, based on the determined amount of residual combustion gas;
a judging step of judging, based on the detected operating conditions of the engine, whether or not supercharging of fresh air flowing to the combustion chamber should be executed so as to cause self-ignition; and
a control step of providing control such that the supercharging is executed when it is judged in said judging step that the supercharging should be executed. - View Dependent Claims (8, 9, 10, 11, 12)
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13. An engine control unit including a control program for causing a computer to control a compression ignition internal combustion engine, to cause a mixture supplied to the engine to burn within a combustion chamber by self-ignition,
wherein the control program causes the computer to detect operating conditions of the engine, determine an amount of residual combustion gas depending on the detected operation conditions of the engine, cause part of combustion gas to be retained in the combustion chamber after combustion, based on the determined amount of residual combustion gas, judge, based on the detected operating conditions of the engine, where or not supercharging of fresh air flowing to the combustion chamber should be executed so as to cause self-ignition, and provide control such that the supercharging is executed when it is judged that the supercharging should be executed.
Specification