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Control system for internal combustion engine

A technology for control systems and internal combustion engines, applied in engine control, fuel injection control, internal combustion piston engines, etc., can solve problems such as increased combustion noise and pressure rise, and achieve the effect of suppressing misfires

Active Publication Date: 2016-01-13
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also, since the mixture of fuel and air is propelled if diffusion combustion does not occur, it is possible to spontaneously ignite a large amount of fuel at once as in homogeneous charge compression ignition (HCCI)
As a result, there may be a sharp pressure rise during combustion
Furthermore, combustion noise may increase due to the increase in pressure

Method used

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  • Control system for internal combustion engine
  • Control system for internal combustion engine
  • Control system for internal combustion engine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] figure 1 It is a diagram for explaining the system configuration of this embodiment. In this embodiment, an internal combustion engine 1 is provided. The internal combustion engine 1 is a gasoline engine. figure 1 Only one cylinder of the plurality of cylinders 2 is shown in . The internal combustion engine 1 is mounted on a vehicle, for example.

[0045] The internal combustion engine 1 includes a cylinder block 4 , and the cylinder block 4 has a piston 3 inside. Piston 3 is connected to crankshaft 6 via connecting rod 5 . A crank angle sensor 61 is provided near the crankshaft 6 . The crank angle sensor 61 detects the rotation angle of the crankshaft 6 (that is, the crank angle).

[0046] A cylinder head 7 is assembled on top of the cylinder block 4 . The cylinder head 7 has an intake port 9 communicating with the inside of the cylinder 2 . In addition, an intake pipe 10 is connected to the cylinder head 7 . The intake port 9 communicates the intake pipe 10 w...

Embodiment 2

[0079] In this embodiment, when the pressure in the cylinder 2 rises sharply during the fuel injection for diffusion combustion, the fuel injection is stopped midway. That is, the main injection is stopped halfway. Since other devices and the like are the same as those in Embodiment 1, description thereof will be omitted.

[0080] Here, when the pressure in the cylinder 2 rises sharply at the time of fuel injection for diffusion combustion, it is considered that homogeneous charge compression ignition occurs. In this case, if fuel injection continues, it will cause a further pressure rise. Therefore, in the present embodiment, when the increase rate (increase amount per unit time) of the pressure in the cylinder 2 is equal to or greater than a predetermined rate, even in the middle of the fuel injection for diffusion combustion, the fuel is injected stop.

[0081] Figure 5 It is a graph showing the relationship between the fuel injection timing and the ignition timing acc...

Embodiment 3

[0092] In the present embodiment, the fuel injection timing in the diffusion combustion of the next cycle is determined based on the time point when the pressure in the cylinder 2 becomes maximum during the diffusion combustion. Since other devices and the like are the same as those in Embodiment 1, description thereof will be omitted.

[0093] In the present embodiment, the fuel injection timing of the next cycle is adjusted so that the time point at which the pressure in the diffusion combustion of the next cycle becomes the maximum becomes the time point at which the combustion efficiency becomes higher. Therefore, the fuel injection timing in the next cycle is adjusted so that the difference between the time point when the pressure becomes the maximum in the current cycle and the time point when the pressure becomes the maximum when the combustion efficiency is the highest is eliminated.

[0094] Figure 7 It is a graph showing the relationship between the fuel injection ...

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Abstract

The purpose of the present invention is to minimize misfiring and sudden increases in pressure. This control system is for an internal combustion engine that, in at least one part of the operating range thereof, carries out diffusive combustion of fuel from a main injection using compression ignition and carries out stratified charge combustion of fuel injected prior to the main injection at a spark plug using spark ignition, and is provided with: a determination unit that determines whether diffusive combustion will occur; and a control unit that carries out combustion of fuel from the main injection at a spark plug using spark ignition when it is determined that diffusive combustion will not occur.

Description

technical field [0001] The invention relates to a control system of an internal combustion engine. Background technique [0002] A technique is known in which an air-fuel mixture is formed around a spark plug and spark ignition is performed, and then fuel is directly injected into a combustion chamber to perform compression self-ignition combustion (for example, refer to Patent Document 1). [0003] In addition, a technique is known in which combustion by flame propagation is performed by performing spark ignition on the premixed gas during light-load operation, and combustion by compression auto-ignition is performed during high-load operation. Diffusion combustion (for example, refer to Patent Document 2). Furthermore, when switching between combustion by flame propagation and diffusion combustion, the switching is performed after performing forced ignition of the pilot injection fuel to combust the air-fuel mixture and after subjecting the main injection fuel to compress...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02P5/15F02D41/38F02D45/00
CPCF02D41/3023F02D41/3076F02D41/402F02P15/08F02D35/023F02D35/025F02D41/3017F02B5/00F02B9/02Y02T10/40F02D37/02F02D41/3005F02P5/145F02P9/002
Inventor 越智雄大柏仓利美吉松昭夫
Owner TOYOTA JIDOSHA KK
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