Patent ID: 7630821
Filing Date: 2009-12-08
Classification: F02D,Y02T

Abstract:
1. An intake quantity sensing device of an internal combustion engine having branch intake passages, which branch from a main intake passage and introduce an intake air into respective cylinders, and intake throttle valves in the branch intake passages of the respective cylinders for adjusting intake quantities respectively, the intake quantity sensing device comprising: an intake pressure sensor provided in the branch intake passage of a specific cylinder out of the branch intake passages of the cylinders for sensing intake pressure downstream of the intake throttle valve; an intake quantity sensor provided in the main intake passage for sensing the intake quantity; a steady period intake quantity sensing device that senses the intake quantity of each cylinder with the intake quantity sensor during steady operation of the engine; an intake pressure variation sensing device that senses information about intake pressure variation among the respective cylinders based on the intake quantities of the cylinders sensed with the intake quantity sensor during the steady operation of the engine; and a transient period intake quantity sensing device that estimates the intake pressure downstream of the intake throttle valve during transient operation of the engine based on an opening degree of the intake throttle valve and the intake pressure sensed with the intake pressure sensor during immediately preceding steady operation and that calculates the intake quantities of the respective cylinders based on the estimated intake pressure and the information about the intake pressure variation.