On the assessment of performance and emissions characteristics of a SI engine provided with a laser ignition system

[摘要] Performance and exhaust emissions of spark ignition engines are strongly dependent on the development of the combustion process. Controlling this process in order to improve the performance and to reduce emissions by ensuring rapid and robust combustion depends on how ignition stage is achieved. An ignition system that seems to be able for providing such an enhanced combustion process is that based on plasma generation using a Q-switched solid state laser that delivers pulses with high peak power (of MW-order level). The laser-spark devices used in the present investigations were realized using compact diffusion-bonded Nd:YAG/Cr4+:YAG ceramic media. The laser igniter was designed, integrated and built to resemble a classical spark plug and therefore it could be mounted directly on the cylinder head of a passenger car engine. In this study are reported the results obtained using such ignition system provided for a K7M 710 engine currently produced by Renault-Dacia, where the standard calibrations were changed towards the lean mixtures combustion zone. Results regarding the performance, the exhaust emissions and the combustion characteristics in optimized spark timing conditions, which demonstrate the potential of such an innovative ignition system, are presented.

[发布机构] Renault Technologie Roumanie, North Gate Business Center, B-dul Pipera, Nr. 2/III, Voluntari, Ilfov; 077190, Romania^1;University Politehnica of Bucharest, Faculty of Electronics, Telecommunications and Information Technology, Spl. Independentei 313, Sector 6, Bucharest; 060042, Romania^2;University Politehnica of Bucharest, Faculty of Mechanical Engineering, Spl. Independentei 313, Sector 6, Bucharest; 060042, Romania^3;EA7341 CMGPCE of Conservatoire National des Arts et Metiers, Paris, France^4;National Institute for Laser, Plasma and Radiation Physics-INFLPR, Laboratory of Solid-State Quantum Electronics, Atomistilor 409, Magurele, Ilfov; 077125, Romania^5;University of Bucharest, Faculty of Physics, Magurele, Ilfov; 077125, Romania^6

[效力级别] 运输工程 [学科分类] 工业工程学

[关键词] Combustion characteristics;Combustion pro-cess;Laser ignition systems;Passenger car engine;Performance and emissions;Plasma generation;Q-switched solid-state lasers;Standard calibration