Method of estimating state quantity or temperature of gas mixture for internal combustion engine

A technology of mixed gas temperature and mixed gas, applied in electrical control, mechanical equipment, engine control, etc., can solve problems such as inaccurate ignition timing and control

Inactive Publication Date: 2006-10-25
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, this device cannot accurately control the ignition timing to the target ignition timing

Method used

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  • Method of estimating state quantity or temperature of gas mixture for internal combustion engine
  • Method of estimating state quantity or temperature of gas mixture for internal combustion engine
  • Method of estimating state quantity or temperature of gas mixture for internal combustion engine

Examples

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Embodiment Construction

[0034] An embodiment of an internal combustion engine (Diesel engine) control apparatus including an air-fuel mixture temperature obtaining apparatus that performs an air-fuel mixture temperature estimation method for an internal combustion engine according to the present invention will now be described with reference to the drawings.

[0035] figure 1 The overall configuration of the system is shown schematically in which the engine control system according to the invention is applied to a four-cylinder internal combustion engine (Diesel engine) 10 . The system includes an engine body 20, an intake system 30, an exhaust system 40, an EGR device 50 and an electronic control device 60, wherein the engine body has a fuel supply system, and the intake system introduces air into the combustion chamber of each cylinder of the engine body 20 (Cylinder interior), the exhaust system discharges exhaust gas from inside the engine body 20, and the EGR device 50 performs exhaust gas circu...

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Abstract

The present apparatus calculates a mass ma (mass ratio ma / mf) of mixing-gas-forming cylinder interior gas, which is a portion of cylinder interior gas to be mixed with a forefront portion of injected fuel vapor having a mass of mf, on the basis of a predetermined empirical formula. Subsequently, under the assumption that heat exchange with the outside does not occur, the apparatus calculates an adiabatic gas mixture temperature Tmix of the gas mixture forefront portion on the basis of the heat quantity of the fuel vapor having a mass of mf and the heat quantity of the mixing-gas-forming cylinder interior gas having a mass of ma. Subsequently, in consideration of an amount of heat that the gas mixture forefront portion receives from peripheral cylinder interior gas mainly via a circumferential surface thereof, the apparatus estimates a final gas mixture temperature Tmixfin of the gas mixture forefront portion (i.e., the temperature of the gas mixture) in accordance with the equation Tmixfin=Tmix (1-Kex) + Ta Kex, where Ta represents cylinder interior gas temperature, and Kex represents a heat exchange coefficient (0 < Kex < 1).

Description

technical field [0001] The present invention relates to a method for estimating the state quantity of a mixture gas of an internal combustion engine. The method can estimate the state quantity such as temperature of a mixture gas formed by mixing fuel injected into a cylinder of an internal combustion engine with air entering the cylinder. Background technique [0002] The amount of emissions such as NOx emitted from an internal combustion engine such as a spark ignition internal combustion engine or a diesel engine is closely related to the flame temperature (combustion temperature) after ignition. Therefore, controlling the flame temperature to a predetermined temperature is effective in reducing the amount of emissions such as NOx. Generally, since the temperature of the flame cannot be directly measured, the flame temperature must be estimated in order to control the flame temperature to a predetermined temperature. Meanwhile, the flame temperature varies depending on t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D35/02F02D45/00
CPCF02D2200/0606F02D35/026
Inventor 中山茂树伊吹卓
Owner TOYOTA JIDOSHA KK
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