FUEL INJECTION CONTROLLER FOR INTERNAL COMBUSTION ENGINE, AND ENGINE INCLUDING THE SAME

摘要

In a fuel injection controller, a first throttle opening TH0 is defined at a specific time P2. The P2 is a specific time later than the peak value of an intake pipe internal pressure PB of a previous cycle. In the cycle, P3 is a specific time that is set immediately before the calculation of the injection time. A second throttle opening TH2 is defined at P3. The fuel injection controller corrects a fuel injection amount based on variation in correction time ta0 at the first throttle opening TH0 to correction time ta1 at the second throttle opening TH1. The time P2 is later than time P1, which is the peak value of the intake pipe internal pressure of the previous cycle. Accordingly, the fuel injection amount correction is completely unaffected or only slightly affected by the intake pipe internal pressure, thus ensuring close-to-ideal correction.

主权项

1. A fuel injection controller for an engine, said fuel injection controller comprising:
a basic fuel injection amount calculator which calculates a basic fuel injection amount to be drawn in an intake stroke of a current cycle based on an engine rotary speed and an intake pipe internal pressure PB in an intake stroke of a previous cycle; a fuel injection amount corrector which makes a correction to the basic fuel injection amount based on variations in
a first throttle opening TH0; anda second throttle opening TH1, which occurs immediately before the calculation of the basic fuel injection amount, wherein the first throttle opening TH0 occurs before the second throttle opening TH1; wherein the fuel injection amount corrector makes the correction to the basic fuel injection amount using the first throttle opening TH0, which is set to one of the throttle opening at and after the maximum lift of an intake valve in the intake stroke of the previous cycle.