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Spark-ignition internal combustion engine

A technology of spark ignition type, internal combustion engine

Inactive Publication Date: 2013-12-04
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, when the closing timing of the intake valve is advanced to increase the amount of intake air supplied to the combustion chamber, knocking will occur when the mechanical compression ratio is maintained constant, so when the engine is running under a medium and high load, the intake air is accompanied by The mechanical compression ratio decreases due to the advance of the door closing period

Method used

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  • Spark-ignition internal combustion engine
  • Spark-ignition internal combustion engine
  • Spark-ignition internal combustion engine

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Embodiment Construction

[0040] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following description, the same reference numerals are attached to the same constituent elements.

[0041] figure 1 A cutaway side view showing a spark ignition internal combustion engine.

[0042] refer to figure 1 , 1 represents the crankcase, 2 represents the cylinder block, 3 represents the cylinder head, 4 represents the piston, 5 represents the combustion chamber, 6 represents the spark plug arranged in the center of the top surface of the combustion chamber 5, 7 represents the intake valve, 8 represents the intake air Port, 9 represents the exhaust valve, and 10 represents the exhaust port. The intake ports 8 are connected to a surge tank 12 via intake branch pipes 11 , and fuel injection valves 13 for injecting fuel into the respective corresponding intake ports 8 are arranged on the respective intake branch pipes 11 . It should be noted that ...

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Abstract

A spark ignition type internal combustion engine of the present invention is provided with a variable compression ratio mechanism able to change a mechanical compression ratio, a variable valve timing mechanism able to control a closing timing of an intake valve, and a supercharger. At the time of engine low load operation, the mechanical compression ratio is made higher compared with at the time of engine high load operation. At the time of engine medium load operation, the supercharging action of the supercharger is used to make the pressure inside the intake pipe rise so that the intake air amount fed into a combustion chamber is increased, compared with at the time of engine low load operation, and the mechanical compression ratio is lowered to make the actual compression ratio fall.

Description

technical field [0001] This invention relates to spark ignition internal combustion engines. Background technique [0002] There is known a spark ignition type internal combustion engine which is provided with a variable compression ratio mechanism capable of changing the mechanical compression ratio and a variable valve timing mechanism capable of controlling the closing timing of the intake valve, and is mainly controlled by changing the closing timing of the intake valve. The amount of intake air supplied to the combustion chamber can increase the mechanical compression ratio when the engine is operating at a low load compared to when the engine is operating at a high load (for example, Patent Document 1). [0003] In particular, in the spark ignition type internal combustion engine described in Patent Document 1, the amount of intake air supplied to the combustion chamber is controlled by changing the closing timing of the intake valve. The closing period of the intake ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D15/04F02D13/02F02D15/00F02D23/00
CPCF02B37/18Y02T10/18F02D13/0226F02D41/0007F02D2041/001Y02T10/144F02D15/02F02B37/24Y02T10/12F02B75/041F02D15/04F02D23/00
Inventor 冈田吉弘林力一
Owner TOYOTA JIDOSHA KK
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