研究目的
Investigating the possibility to improve petrol engine operation by laser ignition.
研究成果
The LI system significantly improved engine performance in lean mixtures, with up to 27% increase in power, reduction of the initial combustion stage duration by ~6.5%, and noticeable decreases in cyclic variability. However, in stoichiometric mixtures, the improvements were not considerable.
研究不足
The study focused on light load and low speed conditions, which are representative for city traffic usage. The improvements brought by the LI system were more significant in lean mixtures than in stoichiometric mixtures.
1：Experimental Design and Method Selection
The study involved replacing the original spark ignition system of a petrol engine with a Laser Ignition (LI) system to compare their performances based on engine power, coefficients of variation, and combustion duration.
2：Sample Selection and Data Sources
A conventional spark plug multipoint fuel injection passenger car engine manufactured by Renault was used. Pressure traces for 500 consecutive cycles were registered for each tested operation condition.
3：List of Experimental Equipment and Materials
The LI system consisted of four identical compact lasers, a fiber-coupled diode laser, optical systems, and a sapphire window. The engine was equipped with an open ECU Continental EMS 3132 and connected with an ECU control system delivered by ETAS-INCA.
4：Experimental Procedures and Operational Workflow
The LI system was mounted directly on the engine, replacing its spark plugs. Stable laser operation was assured by cooling each laser spark plug with water. The engine was tested at light load, 2 bar brake mean effective pressure at 2000 rpm, with stoichiometric and lean air-fuel ratios.
5：Data Analysis Methods
The coefficients of variation for peak fire or maximum pressure, angle of maximum pressure, and indicated mean effective pressure were calculated to characterize the engine operation stability.
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fiber-coupled diode laser
JOLD-120-QPXF-2P
Jenoptik
Pump of Nd:YAG at 807 nm
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eddy current dynamometer
Froude Consine AG 250-UK
Froude
Control and measurement of the engine torque and speed
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dynamic fuel meter
AVL 733S
AVL
Measurement of the engine fuel consumption
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fuel temperature conditioner
AVL 753C
AVL
Conditioning the fuel temperature
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data acquisition system
AVL Indimodul 621
AVL
Data acquisition for cylinder pressures, electric discharge parameters, injectors needle lift
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cylinder-pressure sensors
AVL ZF43
AVL
Measurement of cylinder pressures
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crank angle encoder
AVL 365
AVL
Marker and trigger signals generation required for data recording
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