Ignition timing control for internal combustion engine
First Claim
1. An ignition timing control device for an internal combustion engine which causes an air/fuel mixture inside a cylinder to combust by means of ignition by a spark plug, comprising:
- a programmable controller programmed to;
calculate a heat generation pattern of a gas in the cylinder with respect to a crank angle, on the basis of an intake air volume;
calculate temperature and pressure in the cylinder on the basis of the heat generation pattern;
calculate a limit ignition timing at which knock is not generated, on a basis of the temperature and the pressure in the cylinder; and
control an ignition timing of the spark plug to the limit ignition timing at which knock is not generated.
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Accused Products
Abstract
An internal combustion engine (1) causes an air/fuel mixture in a cylinder to combust due to ignition by a spark plug (14). The engine controller (50) calculates a temperature and pressure in the cylinder on the basis of the operating state of the engine (1) (531), calculates a limit ignition timing at which knock is not generated, on the basis of the temperature and pressure in the cylinder (54), and controls an ignition timing of the spark plug (14) to the limit ignition timing at which knock is not generated (55). Therefore, suitable control of the ignition timing is achieved, by means of a small number of adaptation steps.
38 Citations
12 Claims
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1. An ignition timing control device for an internal combustion engine which causes an air/fuel mixture inside a cylinder to combust by means of ignition by a spark plug, comprising:
a programmable controller programmed to; calculate a heat generation pattern of a gas in the cylinder with respect to a crank angle, on the basis of an intake air volume; calculate temperature and pressure in the cylinder on the basis of the heat generation pattern; calculate a limit ignition timing at which knock is not generated, on a basis of the temperature and the pressure in the cylinder; and control an ignition timing of the spark plug to the limit ignition timing at which knock is not generated. - View Dependent Claims (2, 3, 4, 5)
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6. An ignition timing control device for an internal combustion engine which causes an air/fuel mixture inside a cylinder to combust by means of ignition by a spark plus, comprising:
a programmable controller programmed to; calculate an amount of heat generated by combusted gas in the cylinder on the basis of an operating state of the engine; calculate a cylinder volume on the basis of a crank angle; calculate a cooling loss on the basis of temperature and pressure in the cylinder at the start of compression; calculate a temperature and pressure in the cylinder on the basis of the amount of heat generated, the cylinder volume and the cooling loss; calculate a limit ignition timing at which knock is not generated, on the basis of the temperature and the pressure in the cylinder; and control an ignition timing of the spark plus to the limit ignition timing at which knock is not generated. - View Dependent Claims (7, 8, 9)
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10. An ignition timing control device for an internal combustion engine which causes an air/fuel mixture inside a cylinder to combust by means of ignition by a spark plus, comprising:
a programmable controller programmed to; calculate a temperature and pressure in the cylinder on the basis of an operating state of the engine; calculate a knock generation index forming an indicator of occurrence of knock, on the basis of the temperature and pressure in the cylinder; calculate a limit ignition timing at which knock is not generated, on the basis of the knock generation index; and control an ignition timing of the spark plug to the limit ignition timing at which knock is not generated. - View Dependent Claims (11, 12)
Specification