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Internal combustion engine misfire detector

A detection device, the technology of internal combustion engine, applied in the direction of internal combustion piston engine, combustion engine, mechanical equipment, etc., can solve the problems of deterioration of driving performance, deterioration of exhaust performance, etc., and achieve the effect of reducing the risk of false detection

Active Publication Date: 2020-04-17
HITACHI ASTEMO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When this engine misfire occurs, it may lead to deterioration of driving performance or deterioration of exhaust performance, etc.

Method used

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  • Internal combustion engine misfire detector
  • Internal combustion engine misfire detector

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Experimental program
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Embodiment Construction

[0026] Hereinafter, an internal combustion engine misfire detection device according to an embodiment of the present invention will be described with appropriate reference to the drawings.

[0027] First, refer to figure 1 , the structure of the internal combustion engine misfire detection device in this embodiment will be described in detail.

[0028] figure 1 It is a block diagram showing the configuration of the internal combustion engine misfire detection device in this embodiment.

[0029] Such as figure 1 As shown, the internal combustion engine misfire detection device 1 in this embodiment is composed of an electronic control device such as an ECU (Electronic Control Unit: Electronic Control Unit), and is typically mounted on an engine having a 4-stroke / cycle internal combustion engine, driving wheels, a main clutch, and In this 4-stroke / cycle internal combustion engine, a saddle-riding vehicle such as an automatic two-wheeled vehicle with a transmission has a plural...

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Abstract

An internal combustion engine misfire detector (1) detects misfires in a 4-stroke internal combustion engine and has: a crank angle speed calculation unit (2) which calculates the crank angle speed inaccordance with the rotational speed of the engine at each prescribed crank angle; a determination parameter calculation unit (4) which calculates a reference value for the crank angle speed, calculates a relative crank angle speed as the deviation between the reference value and the crank angle speed, and calculates the integrated value of the relative crank angle speed; and a misfire determination unit (5) which determines if a misfire occurred on the basis of the integrated value, wherein the determination parameter calculation unit (4) sets an integration interval for the integrated valuein accordance with the RPM of the internal combustion engine.

Description

technical field [0001] The present invention relates to a misfire detection device for an internal combustion engine, and more particularly to a misfire detection device for an internal combustion engine that detects a misfire of a 2-cylinder, 3-cylinder 4-stroke / cycle internal combustion engine. Background technique [0002] In an internal combustion engine, such as a 2-cylinder, 3-cylinder 4-stroke / cycle engine, four strokes of intake stroke, compression stroke, expansion stroke, and exhaust stroke are used as one cycle, and the four strokes are repeatedly executed, thereby to generate output. The engine control device controls the timing of fuel injection, ignition, etc. by discriminating each stroke of these engines. At this time, depending on the operating state of the engine or the like, there may be an engine misfire in which a fire does not occur in the engine or does not propagate normally even if a fire occurs. When this engine misfire occurs, it may lead to dete...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D45/00
CPCF02D2200/1015F02D2200/1012F02D2041/1432F02D41/22F02D37/02F02D35/028F02D41/0097
Inventor 田﨑胜德森田优树
Owner HITACHI ASTEMO LTD
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