Cylinder number controlled engine

Abstract

Abstract PURPOSE:To stablilize combustion and to suppress the fluctuation of engine cycle by a method wherein oxygen sensors are provided in exhaust gas passages and when the multicylinder engine performing an air-fuel ratio control is operated with partial cylinders, the density of a air-fuel mixture supplied into the operating cylinders is made higher than the theoretical air- fuel ratio. CONSTITUTION:Calatysts 14 and 15 are provided in the exhaust passage 6 and the downstream side of a junction of the exhaust passages 6 and 7 on the operating side of the multicylinder engine comprising the non-operating side cylinders D-F and the operating side cylinders A-C and the O2 sensors 16 and 17 are provided in the exhaust passages 6 and 7, respectively, so that the signals of the O2 sensors are inputted to a control device 19 which transmits an injection pulse to fuel injection valves (a-f) on the bases of the quantity of sucked air, the engne r.p.m. and the like. When the engine is operated with the partial cylinders, a cotrol means 20 corrects sharply the pulse width of the injection pulse signal by a predetemined ratio and the density of the air-fuel mixture supplied to the operating cylinders is made somewhat higher than the theoretical air-fuel ratio so that the actual air-fuel ratio does not become lower than the theoretical air-fuel ratio even when a hunting phenomenon takes place and it is possible to control the fluctuation of engine cycle irrespective of the lengths of combustion intervals among the cylinders A-C, to thereby improve the operation characteristic of the engine.

Inventors

• 👤 Shizuo Ishizawa
• 👤 石澤　静雄
• 👤 Mitsumasa Inoue
• 👤 井上　光正
• 👤 Takashi Fujii
• 👤 敬士 藤井
• 👤 Shigeru Kamegaya
• 👤 亀ケ谷　茂

Bibliographic Details