| 摘要 |
PURPOSE:To aim at reduction in HC and CO content in exhaust gas, by estimating a fuel quantity sticking to a wall surface of a suction pipe in taking annount of a dynamic characteristic of a fuel system and a flowing lag inside an exhaust pipe, while determinating a fundamental fuel injection quantity on the basis of the estimated quantity. CONSTITUTION:A liquid film factor preparing part 11 calculating a wall surface sticking ratio X(k) and a liquid film evaporating time constant tau(k) is installed in a fuel injection control part at a computer controlling an engine, and its output is inputted into a liquid film quantity estimating part 12. Then, at this estimating part 12, these factors X(k) and tau(k) are converted from a continuous time system to a separation time system and stored in a memory, while air mass is estimated from an engine speed N(k) and suction pressure P(k) and stored in the memory as well. In addtion, observation lag time of an air-fuel ratio A/F or the like is caluclated from the engine speed, and a liquid film quantity after the elapse of the specified time is estimated from information on the lag time or data stored in the said memory, thus a fuel injection quantity is determined from the estimated value. |
