HCCI (homogeneous charge compression ignition) engine fire detecting and controlling method

A control method and engine technology, applied in engine control, machine/engine, electrical control, etc., can solve problems such as difficult signal feature extraction, difficult industrial application, poor signal-to-noise ratio, etc., to eliminate misfires and reduce HC emissions , reducing the effect of fluctuations between cycles

Active Publication Date: 2012-12-12
GREAT WALL MOTOR CO LTD
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Problems solved by technology

[0003] Reliable detection of engine misfire is an important prerequisite for controlling the combustion state of the engine. At present, some people use the engine speed or ion current as the basis for judging the misfire state. It is easy to fail when driving on the road; when the ion

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  • HCCI (homogeneous charge compression ignition) engine fire detecting and controlling method

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Embodiment Construction

[0013] This technical solution is aimed at the in-cylinder direct injection gasoline HCCI engine, with the engine combustion cycle as the control unit, near the compression top dead center, and setting the observation window of the cylinder pressure signal according to the engine working condition and the crankshaft encoder signal (crankshaft angle signal). Since the normal combustion of the engine generally occurs near the top dead center of compression, the part of the cylinder pressure signal that can explain the combustion phenomenon basically appears near the top dead center. When performing feedback control based on the cylinder pressure signal, it is only necessary to process and analyze the signal in the window area near the top dead center to obtain the combustion information in the cylinder. According to the characteristics of HCCI combustion, its combustion speed is very fast, and generally lasts for several or more than ten crank angles. The window interval from 30...

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Abstract

An HCCI (homogeneous charge compression ignition) engine fire detecting and controlling method includes that a crank angle signal and a cylinder pressure signal are acquired in each working cycle of an HCCI engine, a pressure observation window with a compression top dead center is arranged, the integral value of the cylinder pressure signal in the pressure observation window is compared with a fire pressure threshold value at a finishing point of the pressure observation window, when the integral value is smaller than or equal to the fire pressure threshold value, an ECU (electronic control unit) sequentially transmits an oil recharging signal and an ignition signal to an oil injector and an ignition coil, and mixed gas in a fire cylinder is ignited in an expansion stroke. The HCCI engine fire detecting and controlling method has the advantages of simplicity, reliability, high control precision and the like, inter-circulation fluctuation of the HCCI engine can be reduced effectively, stability of combustion of a small load is improved, a running range of an HCCI combustion mode is expanded, fuel economy is improved, and HC (hydrocarbon compound) emission caused by fire is reduced.

Description

technical field [0001] The invention relates to a method for detecting and controlling the combustion state of an in-cylinder direct-injection gasoline HCCI engine, which belongs to the technical field of engines. Background technique [0002] In order to meet the severe challenges of energy saving and environmental protection, the international internal combustion engine industry has carried out extensive research on new combustion technologies for internal combustion engines in recent years. Among them, the homogeneous charge compression combustion technology (HCCI) has become the most important technology due to its outstanding fuel-saving performance and low emission performance. One of the research hotspots. However, HCCI combustion is controlled by chemical reaction kinetics and is very sensitive to factors such as the temperature, concentration and composition of the mixture. Especially in the light load state, the heat generated by the working fluid per unit cycle i...

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Application Information

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IPC IPC(8): F02D43/00G01M15/11
Inventor 张志永高定伟于文斌
Owner GREAT WALL MOTOR CO LTD
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