Cylinder abnormality detecting device for internal combustion engine

Abstract

Abstract PURPOSE:To promptly further accurately detect only a cylinder of abnormality by changing angular speed reference value in the next cylinder to a value larger than the normal updated value, when a rotary angular speed of an output shaft decreases lower than the angular speed reference value in an internal combustion engine. CONSTITUTION:A rotary angular speed of an output shaft in an internal combustion engine M1 is detected by a means M2, synchronizing with a stroke of each cylinder. While it is discriminated by a means M3 whether or not a rotary angular speed of a predetermined stroke in each cylinder is smaller than the angular speed reference value set from a rotary angular speed before the predetermined stroke. Further the angular speed reference value in the next cylinder is changed by a means M4 being based on the rotary angular speed. When the rotary angular speed is smaller than the angular speed reference value, a cylinder of abnormality is detected by a means M5. Here the angular speed reference value is changed by a means M6 to a value larger than the value updated in the means M4. Thus, even when an irregular misfire or the like is generated in the other cylinder, the cylinder of abnormality is promptly further accurately detected.

Inventors

• 👤 Norio Shibata
• 👤 憲郎 柴田
• 👤 Koichi Osawa
• 👤 幸一 大澤

Bibliographic Details