Multi-cylinder internal combustion engine

Abstract

Abstract PURPOSE: To prevent the lowering of a torque produced at the time of transition from low load to high load, by feeding fresh air after stopping the inflow of exhaust at the time of transition, in an internal combustion engine in which a part of exhaust is fed to idle cylinders at the time of low load. CONSTITUTION: When engine 10 is the low load region, the output of cylinder number control circuit 25 is "0", and even if output "1" is supplied from control unit 23 of an electronic fuel ejection control circuit to AND circuit 26, this output is cut out. Consequently, ejection valve 22b for the group corresponding to specified cylinders becomes non-operative. At this time, inverter 28 gives output "1", three- directional electromagnetic valves 10, 21 are energized, and the supply of fresh air to cylinders at rest is stopped by the closing of cutoff valve 14, and at the same time, exhaust is drawn in by the opening of exhaust intake valve 17. Next, at the time of transition from low load to high load, due to the existence of delay circuit 29, cutoff valve 14 is opened after the closing of exhaust intake valve 17, and thereby the exhaust in path 11a is prevented from entering the side of cylinders in operation. COPYRIGHT: (C)1980,JPO&Japio

Inventors

• 👤 Haruhiko Iizuka
• 👤 Fukashi Sugasawa

Bibliographic Details