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Misfire detecting apparatus for internal combustion engine

A detection device, internal combustion engine technology, applied in internal combustion engine testing, mechanical equipment, engine control, etc., can solve problems such as difficult calibration, and achieve the effect of removing the effect of crankshaft torsion

Inactive Publication Date: 2008-05-07
HONDA MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in order to make an accurate correction, not only the engine rotation speed and load, but also the correction corresponding to the cycle temperature is required, and it is very difficult to make a complete correction

Method used

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  • Misfire detecting apparatus for internal combustion engine
  • Misfire detecting apparatus for internal combustion engine
  • Misfire detecting apparatus for internal combustion engine

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0025] FIG. 1 is a diagram showing the configuration of an internal combustion engine and its control device according to an embodiment of the present invention. An internal combustion engine (hereinafter simply referred to as “engine”) 1 has, for example, six cylinders, and has an intake pipe 2 and an exhaust pipe 5 . A throttle valve 3 is arranged in the intake pipe 2 . Furthermore, a catalytic converter 6 for purifying exhaust gas is provided in the exhaust pipe 5 .

[0026] The fuel injection valve 4 is arranged between the engine 1 and the throttle valve 3 and slightly upstream of the intake valve not shown in the intake pipe 2 for each cylinder, and each injection valve is connected to a fuel pump not shown and connected to an electronic valve. A control unit (hereinafter referred to as “ECU”) 20 is electrically connected, and controls the valve opening timing of fuel injection valve 4 based on a control signal from ECU 20 .

[0027] Immediately downstream of the throt...

no. 2 Embodiment approach

[0064] In the above-mentioned embodiment, the averaging time parameter CRMEM is converted into the rotation speed OMG, and the misfire determination is performed using the rotation speed OMG as a speed parameter. However, in this embodiment, the misfire determination is performed using the averaging time parameter CRMEM as a speed parameter. . In addition, it is the same as that of the first embodiment except for the points described below.

[0065] FIG. 8 is a flowchart of a misfire determination process using a time parameter CRME as a speed parameter.

[0066] In step S30, the averaging time parameter CRMEM(i) is calculated based on the above formula (1).

[0067] In step S32, according to the following formula (21), 720-degree filtering processing is performed, and the post-filtering time parameter CRMER(i) is calculated.

[0068] CRMER(i) = CRMEM(i)

[0069] -(CRMEM(0)-CRMEM(ND))×Dθ×i / 720

[0070] (twenty one)

[0071] In step S33, the relative time parameter CRMEREF...

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Abstract

A fire detecting apparatus of the internal-combustion engine for judging the fire correctly by using a simple method excluding the influence of crankshaft twisting. A moving averaging calculation is performed with respect to the time parameter CRME that is the time interval generated by the crankshaft angle pulse to calculate the averaging time parameter CRMEM (S10). The moving averaging calculation is performed by using the time parameter CRME of the data NTDC, and the data NTDC is calculated by using the flowing equation: NTDC = 720 / (N X D theta) where (N) is a number of cylinders and (D theta) is a detecting angular period (for example: six degree) of the time parameter CRME.

Description

technical field [0001] The invention relates to a misfire detection device for an internal combustion engine, in particular to a misfire detection device for an internal combustion engine that determines misfire according to a rotation speed parameter corresponding to the rotation speed of the internal combustion engine. Background technique [0002] When the misfire determination is performed based on the rotational speed parameter corresponding to the rotational speed of the internal combustion engine, if the rotational speed parameter fluctuates due to factors other than fluctuations caused by combustion of the internal combustion engine, erroneous determinations will occur. For example, in a high rotation range where the engine rotation speed exceeds, for example, 5000 rpm, the rotation variation due to the crankshaft twist of the internal combustion engine may increase, and misfire determination based on the rotation speed parameter is prone to misjudgment. [0003] Pat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D45/00
CPCG01M15/11
Inventor 四竃真人塚本宗纪
Owner HONDA MOTOR CO LTD