Control device for internal combustion engines
A technology for control devices and internal combustion engines, applied in engine control, internal combustion piston engines, electrical control, etc., can solve problems such as the inability to accurately calculate the correction value of absolute pressure, and achieve the effect of expanding the adiabatic period, improving the correction accuracy, and improving the calculation accuracy
Inactive Publication Date: 2014-09-24
TOYOTA JIDOSHA KK
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Problems solved by technology
In this way, under driving conditions where the adiabatic compression stroke period of the internal combustion engine is shortened, it may not be possible to accurately calculate the absolute pressure correction value, and improvement is desired
Method used
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Embodiment approach 1
[0027] [Configuration of Embodiment 1]
[0028] figure 1 It is a schematic configuration diagram for explaining the system configuration as Embodiment 1 of the present invention. Such as figure 1 As shown, the system of this embodiment includes an internal combustion engine 10 . The internal combustion engine 10 is configured as a spark ignition type multi-cylinder engine that uses gasoline as fuel. A piston 12 reciprocating therein is provided in a cylinder of the internal combustion engine 10 . In addition, the internal combustion engine 10 includes a cylinder head 14 . A combustion chamber 16 is formed between the piston 12 and the cylinder head 14 . The combustion chamber 16 communicates with an intake passage 18 and one end of an exhaust passage 20 , respectively. Intake valves 22 and exhaust valves 24 are respectively arranged at communication portions between the intake passage 18 and the exhaust passage 20 and the combustion chamber 16 .
[0029] The intake valv...
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The present invention relates to a control device for an internal combustion engine which accurately corrects a CPS detection value to an absolute pressure regardless of the length of an adiabatic compression stroke in an internal combustion engine having an in-cylinder pressure sensor. In an internal combustion engine (10) having an internal cylinder pressure sensor (34) for each cylinder, detected values P1, P2, Calculate the absolute pressure correction value Pr (=(P2V2κ-P1V1κ) / (V1κ-V2κ)) from the cylinder volume V1 and V2, and the specific heat ratio κ, and use the absolute pressure correction value Pr to correct the cylinder internal pressure detection value for absolute pressure. At this time, when the adiabatic compression stroke period (ignition timing - IVC) is less than the predetermined crank angle period CAth, the ignition timing is retarded (steps 104 to 106), and when the adiabatic compression stroke period is greater than CAth, the ignition timing is retarded. IVC advances (steps 114~116). It is preferable to control the ignition timing of each cylinder to suppress the torque fluctuation before advancing the IVC (step 112 ).
Description
technical field [0001] The present invention relates to a control device for an internal combustion engine, and more particularly to a control device for an internal combustion engine equipped with a cylinder internal pressure sensor. Background technique [0002] In the past, for example, in Japanese Patent Laid-Open No. 2007-146785, it is proposed to use the detection value of the cylinder pressure sensor (hereinafter also referred to as "CPS") to calculate the amount of air entering the combustion chamber, and use the air amount to A control device that optimally determines the ignition timing. The CPS detects the in-cylinder pressure as a relative pressure to the intake pipe pressure. Therefore, in order to use the detected value of the CPS for various controls, it is necessary to correct the detected value to an absolute pressure. In the conventional control device described above, the PV in the compression stroke after the intake bottom dead center is used κ When th...
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IPC IPC(8): F02D45/00
CPCY02T10/46F02D2200/0408F02P5/1455F02D41/1498F02D2200/0402F02D41/0002F02D2200/0406Y02T10/42F02D41/00Y02T10/40
Inventor 浦野繁幸
Owner TOYOTA JIDOSHA KK