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Engine

An engine and fuel technology, applied in combustion engines, engine control, machines/engines, etc., to solve problems such as deterioration of exhaust emissions and deterioration of fuel economy

Inactive Publication Date: 2007-12-19
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the problems of fuel economy deterioration and exhaust emission (especially NOx) deterioration occur

Method used

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Embodiment Construction

[0027] Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

[0028] Figure 1 schematically shows a system structure, which roughly illustrates a lean-burn engine equipped with a supercharger, in which the engine uses a turbocharger as a supercharger, and according to the first and second aspects of the present invention The embodiment is applied to the system. The engine 100 shown in FIG. 1 is configured as a multi-cylinder engine (for example, a four-cylinder engine, but only one cylinder is shown in FIG. 1), and an air-fuel mixture is combusted in each combustion chamber 102 to cause the piston 103 to reciprocate, thereby The crankshaft (not shown) gains power. Note that the engine may not have a supercharger.

[0029] Each combustion chamber 102 of the engine 100 communicates with an intake port 104 and an exhaust port 105. The intake manifold 106 is connected to the intake port 104. The exhaust manifold ...

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Abstract

An engine includes an in-cylinder injector injecting fuel into a cylinder, a port injector injecting fuel into an intake manifold, and a valve-opening-characteristic changing mechanism changing at least lift or opening duration of an intake valve. When the engine is in a predetermined operating region and the valve-opening-characteristic changing mechanism decreases the lift or the opening duration of the intake valve, the ratio of fuel injected by the in-cylinder injector is increased according to an amount of the decrease of the lift or the opening duration and accordingly a decrease in tumble ratio is compensated for by the injection flow.

Description

Technical field [0001] The present invention relates to an engine, and particularly to an engine having an in-cylinder injector that injects fuel into a cylinder and an intake port injector that injects fuel into an intake manifold or an intake port, and a valve opening characteristic changing mechanism. Background technique [0002] Generally speaking, a so-called dual-injection engine is known to have an in-cylinder injector that injects fuel into the cylinder and an intake port injector that injects fuel into the intake manifold or intake port, and according to the operating state of the engine These injectors are used in turn to achieve, for example, stratified charge combustion when the engine is in a low-load operating region and homogeneous charge combustion when the engine is in a high-load operating region, or to use these injectors at the same time at a predetermined fuel injection ratio. Improve such as fuel economy and output characteristics. [0003] Further, a dual-...

Claims

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Application Information

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IPC IPC(8): F02D41/34F02D41/40F02D41/00
CPCY02T10/44Y02T10/144
Inventor 入泽泰之
Owner TOYOTA JIDOSHA KK
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