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Spark ignition type internal combustion engine

A spark-ignition, internal combustion engine technology, applied to internal combustion piston engines, combustion engines, mechanical equipment, etc., can solve problems such as the inability to fully improve thermal efficiency

Active Publication Date: 2012-10-03
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, in this region, the thermal efficiency cannot be sufficiently improved

Method used

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  • Spark ignition type internal combustion engine
  • Spark ignition type internal combustion engine
  • Spark ignition type internal combustion engine

Examples

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Embodiment Construction

[0036] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, in the following description, the same reference numerals are assigned to the same components.

[0037] figure 1 A side sectional view of a spark ignition internal combustion engine is shown in .

[0038] 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 surge tanks 12 via intake branch pipes 11 , and fuel injection valves 13 for injecting fuel into the corresponding intake ports 8 are arranged in each intake branch pipe 11 . In addition, the fuel injection va...

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Abstract

A spark ignition type internal combustion engine includes a plurality of cylinders, in some of which combustion can be halted. The spark ignition type internal combustion engine further includes a variable compression ratio mechanism (A) capable of changing a mechanical compression ratio and a variable valve timing mechanism (B) capable of controlling the closing timing of an intake valve (7). When some of the cylinders are deactivated or when the number of deactivated cylinders is increased, the closing timing of the intake valve (7) is shifted in the direction approaching an intake bottom dead center, and the mechanical compression ratio of a cylinder in operation is reduced. By thus deactivating some of a plurality of cylinders, it is possible to obtain a high thermal efficiency even in a low engine load region.

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 that includes: a variable compression ratio mechanism capable of changing the mechanical compression ratio; and a variable valve timing mechanism capable of The closing timing of the intake valve is controlled, mainly by changing the closing timing of the intake valve to control the amount of intake air supplied to the combustion chamber. In comparison, the mechanical compression ratio becomes higher (for example, refer to Patent Document 1). [0003] In particular, since the mechanical compression ratio (that is, the expansion ratio) has a greater influence on the theoretical thermal efficiency than the actual compression ratio, in the spark ignition type internal combustion engine described in Patent Document 1, the actual The compression ratio is maintained at a low value, and the mecha...

Claims

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Application Information

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IPC IPC(8): F02D17/02F02D13/02F02D15/04
CPCF02D41/0087F02D13/0269Y02T10/42Y02T10/142F02D13/06F02D17/02F02D41/0002F02D15/04Y02T10/12F02D13/0238F02D13/023Y02T10/40
Inventor 久凑直人神山荣一立野学
Owner TOYOTA JIDOSHA KK
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