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The courses of the characteristics of spark ignition engines for fuelling with petrol and lpg gas in the dynamic conditions of motion

Romaniszyn K. M.

Journal of KONES

2006

Vol. 13, No. 1

325-331

This paper analyses and evaluates the dynamic speed characteristics calculated from the timed values of the acceleration of 2 cars fuelled in by petrol and liquefied LPG gas. One of the two cars was factory fitted with a carburettor, the other one was factory fitted with a multipoint injection system. Both cars were then fitted with put-on type LPG gas fuelling systems. The impact of the fuel type on the curves of torque generated by the engine in dynamic conditions and their reference to speed characteristics for steady operational conditions. The schema of a gas fuelled system for a car with carburettor petrol system and the schema of gas fuelled system for a car with an engine with multipoint petrol injection is presented in the paper. Test results involve variability of torques generated by the engine of the car with carburettor power supply petrol in the function of the rotational speed at accelerating the motion on IV and V gear, and the variability torques generated by the engine of the car supplied of MPI in the function of the rotational speed at accelerating the motion on IV and V gear. Building of feed gas installation causes the essential decreasing of the engine power especially at higher rotational speeds for the car-supplied standard with the carburettor, whereat this decreasing applies both feed petrol as and gas. However building of the feed gas installation does not cause the essential change torque at feed petrol with the standard multipoint injection petrol MPI. But essential decreasing torque in dynamic conditions occurs at the gas feed.

Dla samochodu zasilanego standardowo gaźnikiem, zabudowanie instalacji zasilania gazem powoduje istotny spadek mocy szczególnie na wyższych prędkościach obrotowych, przy czym spadek ten dotyczy zarówno zasilania benzyną jak i gazem. Dla samochodu zasilanego standardowo wielopunktowym wtryskiem benzyny MPI zabudowanie układu zasilania gazem nie powoduje istotnej zmiany momentu obrotowego w przy zasilaniu benzyną natomiast występuje istotny spadek momentu obrotowego w warunkach dynamicznych przy zasilaniu gazem.