Method of detecting combustion condition of internal- combustion engine

Abstract

Abstract PURPOSE:To make traditional finger-pressure sensor unnecessary by a method wherein an instaneous revolving speed of the internal-combustion engine is detected at least two points in one ignition cycle and the combustion condition is detected by the revolutional fluctuation in one ignition cycle obtained by the difference thereof. CONSTITUTION:Crank angle sensors 3, 4, corresponding to each protuberances 2a, 2b of a crank pulley 2, and a suction air volume sensor 5 are equipped in the system and the amount of fuel injection is operated in an operation circuit 6 based on the outputs thereof. In this case, the revolutional speed of the engine is detected in the operation circuit 6 at least two points in one ignition cycle between the ignition of prior time and the same of this time. The value of the revolutional speed fluctuation in one ignition cycle is obtained by the difference of the detected revolutional speed while said values of the fluctuation, obtained sequentially, are operated and processed statistically. In this process, the standard deviation of the fluctuating value is operated and the judgment of the combustion condition of the engine is effected to control an injector 7 by comparing the result of said operation with a predetermined value.

Inventors

• 👤 Shunichi Ando
• 👤 俊一 安藤
• 👤 Takeshi Matsui
• 👤 武 松井
• 👤 Hideo Ooyama
• 👤 大山　日出雄
• 👤 Ryosuke Jo
• 👤 城　良輔
• 👤 Taiji Isobe
• 👤 大治 磯部

Bibliographic Details