| 摘要 |
<p>PURPOSE:To improve the responsiveness of the flow rate measurement of satisfactory responsiveness by calculating a correction value in a correction ratio corresponding to a temperature characteristic of a holding member at the time of increase and at the time of decrease of a flow rate. CONSTITUTION:A signal processor 9 executes a correcting operation by various sensors, mainly on an air flow rate signal from an air flow rate sensor 1 contained in a suction passage 2, and an engine revolution speed signal from a crank angle sensor 8, and controls injection pulse width of an injector 7. That is, the processor 9 derives in advance the corresponding flow rate, based on a flow rate characteristic measured in advance, by a value brought from an output voltage obtained after A/D conversion at a prescribed time interval, and when an interrupting signal by the sensor 8 is input ted, an average air flow rate Qa between rotation signals is calculated from an integrat ing value of the flow rate and the number of times of integration in this time. Subse quently, data CQmax to the flow rate Qa at the time when the sensor 1 is in a station ary state is derived by referring to a table set in advance. Next, by deriving a correc tion coefficient C and multiplying the flow rate Qa by the coefficient C, a substantial air quantity is calculated.</p> |
