REVOLUTION SPEED LIMITER FOR ENGINE SUBJECTED TO LARGE LOAD VARIATION

摘要

Engine speed limiters are safety devices to prevent the engine to exceed a predetermined high speed. The presented speed limiter is designed for large load variations which requires accurate and fast Air-Fuel ratio control. It is based on feedback linearization and on-line estimation of the load torque. Experimentations was done with a Sea-Doo~R watercraft powered by a Rotax~R four-stroke engine. A dSpace~R system was used to by-pass the engine ECU injector commands and to use those of the developed controller. Experimental results show that the developed controller performs better than usual ECU injection cut-off strategy.