LARGE TURBOCHARGED SLOW RUNNING TWO-STROKE DIESEL ENGINE AND METHOD FOR OBTAINING CHARACTERISTICS OF A BUTTERFLY VALVE IN A LARGE TWO-STROKE DIESEL ENGINE

摘要

A method of determining the characteristics of a non-linear valve (34, 44) in an exhaust bypass of a large turbocharger low speed two-stroke diesel engine (1) used to regulate flow in an exhaust bypass is disclosed. The exhaust bypass allows the exhaust gas to controllably bypass the turbine 17 of the turbocharger 16. [ The method includes the steps of driving the engine 1 and opening the non-linear valve 34, 44 in a small incremental amount to a fully open position in a fully closed position and driving the non-linear valve 34, 44 ), And / or closing the non-linear flow regulating valve (34, 44) in a fully increased position to a fully closed position with a small incremental amount, And measuring the scavenging pressure at each position of the fly valve. The method then includes recording the valve position and the measured associated scavenging pressure and storing the recorded position and associated scavenging pressure.