| 摘要 |
PROBLEM TO BE SOLVED: To simply and accurately find the cylinder intake fresh air quantity or intake pipe pressure when EGR gas is supplied. SOLUTION: An intake pipe downstream from a throttle valve and an exhaust pipe are connected to each other through an EGR supply pipe to recirculate exhaust gas in the intake pipe. The relationship between the intake pipe pressure Pm which is the pressure in the intake pipe downstream from the throttle valve and the engine load rate KL representing the quantity of fresh air injected into a cylinder, that is, the relationship between the intake pipe pressure Pm and the engine load rate KL in steady operation is represented by the following two linear function formulas different in gradient and continuous at a connection point CP, and the solutions of these two linear function formulas are previously found and stored. KL = a1×(Pm-b) + c (Pm≤b), KL = a2×(Pm-b) + c (Pm > b). The intake pipe pressure Pm is detected, and the engine load rate KL is calculated from the intake pipe pressure Pm using the linear function formulas, and on the basis of the found engine load rate KL, fuel injection quantity QF is calculated. COPYRIGHT: (C)2004,JPO&NCIPI
|
