COMPRESSION RATIO VARIABLE SYSTEM FOR DIESEL ENGINE

摘要

PURPOSE: To improve an exhaust characteristic of a diesel engine, provided with a Bosch fuel injection pump, both at idling time and full load time. ;CONSTITUTION: A piston 10, having a combustion chamber 12 of small displacement with high compression ratio, is built in #1, 2, 3 cylinders, and a piston 11, having a combustion chamber 13 of large displacement with low compression ratio, is built in #4, 5, 6 cylinders, of a 6-cylinder engine. A plunger lead of a fuel injection pump is set so as to inject fuel from idling time in the #1, 2, 3 cylinders, and so as to start fuel injection after passing idling in the ξ4, 5, 6 cylinders further with injection fuel of amount larger than in the #1, 2, 3 cylinders at full load time. Thus at the idling time, operation is performed with only the piston of high compression ratio, to improve deodoration and white smoke at idling time and emission at no-load time. Since the piston of low compression ratio weighs heavy at the full-load time, exhaust color can be prevented from worsening.;COPYRIGHT: (C)1993,JPO&Japio