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Intake port fuel injection engine

A suction port and fuel injection technology, applied to combustion engines, internal combustion piston engines, engine ignition, etc., can solve problems such as unstable combustion, low exhaust purification performance, and reduced fuel efficiency

Active Publication Date: 2013-06-12
MITSUBISHI MOTORS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to increase the temperature of the exhaust purification catalytic converter, a method of retarding the ignition timing and thereby raising the temperature of the exhaust gas is effective, but this method has a problem of combustion instability
Therefore, the amount of fuel injection must be increased in order to stabilize combustion, however, in this case, fuel efficiency is lowered, and exhaust gas purification performance may remain low until the exhaust gas purification catalytic converter is activated

Method used

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Examples

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Embodiment Construction

[0033] An embodiment of the present invention will be described below with reference to the accompanying drawings.

[0034] figure 1 It is a cross-sectional view schematically showing the internal structure of an intake port fuel injection engine (hereinafter referred to as engine 1 ) according to the present invention.

[0035] Such as figure 1 As shown in , an engine 1 according to an embodiment of the present invention is an engine having an intake stroke injection mode for injecting fuel from a fuel injection valve 3 provided in an intake passage 2 toward a combustion chamber 4 .

[0036] A spark plug 6 is disposed in an approximately central portion of a cylinder head 5 of the engine 1 so as to face the combustion chamber 4 . The lower surface of the cylinder head 5 slopes downward on either side of a generally central ridged line, thereby defining the pent roof shape of the combustion chamber 4 . The intake port 7 opens in one inclined surface forming the lower surfac...

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Abstract

A semi-direct injection engine is used for injecting fuel from a fuel injection valve provided in an intake port toward the interior of a combustion chamber when an intake valve is open, wherein: the top surface of a piston (30) is provided with a first cavity (32) on an exhaust valve side, and a second cavity (33) on an intake valve side; and a projecting part (34) projects upward so as to separate the first cavity (32) and the second cavity (33). In addition, the projecting part (34) is positioned in a manner such that the first cavity (32) is smaller than the second cavity (33), and an electrode (6a) of a spark plug (6) provided in the combustion chamber faces the second cavity (33).

Description

technical field [0001] The present invention relates to engines configured to inject fuel into an intake port, and more particularly to engines that inject fuel when an intake valve is open. Background technique [0002] As an intake port fuel injection engine configured to inject fuel from a fuel injection valve provided in the intake port, an engine has been developed which is operable in an intake stroke injection mode so that Fuel is injected when the valve is open. [0003] In such an engine having an intake stroke injection mode, fuel is injected when an intake valve is opened while an exhaust valve is closed, whereby discharge of fuel into an exhaust passage can be suppressed. Also, even if the fuel injection valve is provided in the intake port, fuel can be accurately supplied to the inside of the combustion chamber at an appropriate time, which can improve engine output and fuel efficiency, like cylinder type fuel injection engines. [0004] Also, when the engine ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02B23/08F02F3/26F02P5/15F02P13/00
CPCF02B23/08F02M35/10216F02M35/1085F02P13/00Y02T10/12
Inventor 秦幸司田中大
Owner MITSUBISHI MOTORS CORP
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