Control apparatus for internal combustion engine
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsMasakatsu NAGAI, Hiromichi YASUDA
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Abstract
An in-cylinder pressure sensor detecting in-cylinder pressure is provided. A first crank angle and a second crank angle in the adiabatic compression stroke are set using an in-cylinder-pressure-maximum crank angle as a baseline, and an absolute pressure correction value is calculated using the in-cylinder pressure and in-cylinder volume at each of these crank angles. A crank angle advanced from the in-cylinder-pressure-maximum crank angle is set as the second crank angle in a manner so as to be a timing in the adiabatic compression stroke on the retard side with respect to the spark timing, and is used for the absolute pressure correction.
Claims7
A control apparatus for an internal combustion engine, comprising:
- an in-cylinder pressure sensor detecting in-cylinder pressure;
- and
- a processor, the processor programmed to:
- obtain an in-cylinder-pressure-maximum crank angle when in-cylinder pressure detected by the in-cylinder pressure sensor becomes maximum during a combustion duration;
- and
- set, using the in-cylinder-pressure-maximum crank angle as a baseline, a first crank angle and a second crank angle on a retard side of the first crank angle in an adiabatic compression stroke from a closing timing of an intake valve until a start of combustion and, based on in-cylinder pressure and in-cylinder volume at each of the first crank angle and the second crank angle, perform absolute correction for the in-cylinder pressure detected by the in-cylinder pressure sensor,
- wherein the second crank angle that is set by the processor is a crank angle advanced with respect to the in-cylinder-pressure-maximum crank angle in a manner so as to be a timing in the adiabatic compression stroke on a retard side with respect to the spark timing, and is used for the absolute correction.
Dependencies are inferred from the claim text.