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spark ignition direct injection engine

A spark ignition type, spark ignition technology, applied in the direction of engine control, combustion engine, machine/engine, etc., can solve the problems of steep pressure change ratio, large combustion noise, etc.

Active Publication Date: 2016-06-29
MAZDA MOTOR CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this case, the air-fuel mixture in the cylinder may cause pre-ignition such as compression ignition during the compression stroke period, and the pressure increase rate (dP / dt) in the cylinder, that is, every predetermined time (dt) during the pressure increase period The ratio of the pressure change (dp) in the cylinder becomes steeper and may cause larger combustion noise

Method used

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Embodiment Construction

[0069] Hereinafter, embodiments of a spark ignition type direct injection engine will be described with reference to the drawings. The description of the following preferred embodiments is an illustration. figure 1 , figure 2The schematic structure of the engine (engine main body) 1 is shown. The engine 1 is a spark ignition type gasoline engine mounted on a vehicle and supplied with fuel containing at least gasoline. The engine 1 has: a cylinder block 11 provided with a plurality of cylinders 18 (in addition, in figure 1 only one cylinder is shown in the figure, but for example, four cylinders are arranged in series); the cylinder head 12 arranged on the cylinder block 11; shell13. A piston 14 connected to the crankshaft 15 via a connecting rod 142 is inserted so as to be reciprocatable in each cylinder 18 . On the top surface of the piston 14, as in image 3 As shown enlarged in FIG. 2 , a cavity 141 like a concave in a diesel engine is formed. When the piston 14 is ...

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Abstract

A spark ignition direct injection engine avoids increased combustion noise when switching from spark ignition combustion to compression ignition combustion. Immediately after the controller (PCM (10)) switches from the spark ignition mode to the compression ignition mode, the fuel pressure is set to a high fuel pressure of 30 MPa or more through the fuel pressure setting mechanism, and the fuel injection valve (injector (68) ) so that fuel injection is performed at least during the period from the late stage of the compression stroke to the early stage of the expansion stroke, thereby causing the engine main body (engine (1)) .

Description

technical field [0001] The technology disclosed in this invention relates to a spark ignition direct injection engine. Background technique [0002] For example, as described in Patent Document 1, a combustion system that compresses and ignites an air-fuel mixture in a cylinder is known as a technology that achieves both an improvement in exhaust emission performance and an improvement in thermal efficiency. In an engine performing such compression ignition combustion, as the load on the engine increases, the compression ignition combustion becomes combustion in which the pressure rises sharply, leading to an increase in combustion noise. Therefore, as described in Patent Document 1, even an engine that performs compression ignition combustion generally does not perform compression ignition combustion but performs spark ignition combustion by driving the spark plug in the high-load operating range. [0003] Patent Document 2 describes a technique in which, like the engine o...

Claims

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Application Information

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IPC IPC(8): F02P5/145F02D45/00
CPCF02D41/1446F02D41/18F02D41/3035F02D41/3041F02D41/3064F02D41/3836F02D41/401F02D2041/0067F02D2200/0406F02B11/00Y02T10/40F02D43/04
Inventor 岩井浩平山川正尚田贺淳一中川滋水野沙织荒木启二
Owner MAZDA MOTOR CORP
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