| 摘要 |
<P>PROBLEM TO BE SOLVED: To measure cylinder intake air amount per one intake stroke of an engine. <P>SOLUTION: Pressure difference of two points in the engine intake pipe is detected by pressure difference sensor 1, pressure of one point is detected by a pressure sensor 2, a time differentiated value of pressure is determined by a differential computing unit 5, pressure difference and time differential value of pressure and pressure is determined by a flow rate differentiated value operation part 43 and a time differentiated value of mass flow rate is determined by the mass flow rate, a mass flow rate is determined by one-time-integrating the time differentiated value of mass flow rate by one time integration part 9, an integrated flow rate is determined by integrating further one time integration value by two times integrating part 10, and the mass flow rate is corrected to zero at the point of time at which a time differentiated value of pressure becomes zero in a period in which an intake valve is closed. Furthermore, cylinder intake air amount per one intake stroke is determined from the integrated flow rate at two points of time of start of opening of the intake valve by an intake air amount operation part 44 and closing-finish of the intake valve. <P>COPYRIGHT: (C)2012,JPO&INPIT |
