Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Fuel injection control device for internal combustion engine

A technology of fuel injection and control device, applied in the directions of fuel injection control, engine control, internal combustion piston engine, etc., can solve the problems of longer time, incorrect ignition sequence, etc., and achieve the effect of shortening the consumption time

Inactive Publication Date: 2007-11-21
TOYOTA JIDOSHA KK
View PDF2 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, when misfire occurs after the initial ignition, the ignition sequence becomes incorrect, and conventionally, fuel injection to the misfired cylinder is stopped
As a result, the time until the start of the internal combustion engine is completed becomes longer

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Fuel injection control device for internal combustion engine
  • Fuel injection control device for internal combustion engine
  • Fuel injection control device for internal combustion engine

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0075] FIG. 1 is a schematic configuration diagram of an internal combustion engine 1 according to the present embodiment.

[0076] The internal combustion engine 1 shown in FIG. 1 is a four-stroke cycle water-cooled diesel engine with four cylinders 2 .

[0077] A fuel injection valve 3 that injects fuel into each cylinder 2 is provided in each cylinder 2 of the internal combustion engine 1 .

[0078] Furthermore, a crank position sensor 4 that outputs a signal depending on the engine speed is provided in the internal combustion engine 1 .

[0079] Furthermore, an ECU 5 as an electronic control unit for controlling the internal combustion engine 1 is provided together with the internal combustion engine 1 . The ECU 5 is a unit that controls the operating state of the internal combustion engine 1 according to the operating conditions of the internal combustion engine 1 and the driver's request.

[0080] Fuel injection valve 3 is connected to ECU 5 by wires, and ECU 10 contro...

no. 2 approach

[0121] In this embodiment, compared with the first embodiment, the set value of the fuel injection timing in the next stroke cycle of the cylinder that has misfired is different. Other than that, the hardware is the same as that of the first embodiment, so the description thereof is omitted.

[0122] Here, unburned fuel remains in the misfiring cylinder, and in the next stroke cycle, this unburned fuel promotes the ignition of the fuel. In addition, the ignition lag during fuel ignition becomes short due to unburned fuel remaining in the cylinder. Thus, in the misfired cylinder, the ignitability in the stroke cycle following the misfire stroke cycle is improved.

[0123] Fig. 9 is a combustion state diagram of the next stroke cycle of each combustion state. The engine speed is shown on the abscissa and the ignition lag is shown on the ordinate. An ignition lag of 40° CA indicates that ignition did not occur (ie misfire occurred). In addition, a triangular symbol indicates ...

no. 3 approach

[0140] In the third embodiment, the fuel injection timing is set based on the history of past combustion states. Other than that, hardware is the same as that of the first embodiment, and thus description thereof will be omitted.

[0141] Here, during start-up of the internal combustion engine, since ignitability is prioritized, the fuel injection timing is set to the advanced side in all cylinders. Furthermore, the increase in engine speed is achieved by gradually retarding the fuel injection timing from the start of the internal combustion engine.

[0142] Furthermore, in this embodiment, during the period from the start of the internal combustion engine to the completion of the start, the accumulated number of ignition failures or the accumulated number of ignitions for each cylinder from the start to the current point in time is obtained, and based on this value, The delay amount of the fuel injection timing from the current point of time to the start completion is change...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A fuel injection control device for an internal combustion engine, in which a misfire in engine starting is suppressed to make time from the initiation of engine starting to the completion of the starting more appropriate. The fuel injection control device is a device for a compression-ignition-type internal combustion engine having plural cylinders, and the device has a fuel injection valve provided for each cylinder and injecting fuel into inside each cylinder; a combustion condition detection means for estimating or detecting combustion conditions of each cylinder; and a fuel injection timing setting means for changing fuel injection timing of a cylinder that the combustion condition detection means has estimated or detected it misfiring to first fuel injection timing. That is, fuel injection timing is changed on a cylinder-by-cylinder basis.

Description

technical field [0001] The present invention relates to a fuel injection control device for an internal combustion engine. Background technique [0002] During a cold start of the internal combustion engine, since the temperature of the cylinder wall surface is low, the combustion state in the cylinder becomes unstable, thereby causing misfire. [0003] As a countermeasure, a technique is known in which, during startup of a diesel engine, a cylinder to be ignited first is detected, and the injection timing and fuel amount of fuel injected into the sequentially ignited cylinders are changed in accordance with the engine speed and water temperature . For example refer to: [0004] Patent Document 1: Japanese Patent Application Publication JP-A-H8-296477 [0005] Patent Document 2: Japanese Patent Application Publication JP-A-S63-154841 [0006] Patent Document 3: Japanese Patent Application Publication JP-A-2000-8930 [0007] Patent Document 4: Japanese Patent Application...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): F02D41/06F02D41/40F02D41/14F02D45/00
CPCF02D41/401F02D2250/18Y02T10/44F02D31/007F02D2200/1015F02D41/2451F02D41/1498F02D41/062F02D41/008F02D2200/1002Y02T10/40
Inventor 岩谷一树
Owner TOYOTA JIDOSHA KK
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com