| 摘要 |
<P>PROBLEM TO BE SOLVED: To secure a most suitable amount of EGR gas in an exhaust gas recirculation system for an engine device without being affected by intake and exhaust pressures of an engine. <P>SOLUTION: In the exhaust gas recirculation system, an intake-side reference EGR gas flow rate Qsi is obtained by pressure conversion from an exhaust-side reference EGR gas flow rate Qse calculated based on a relation between the detected results of an engine speed detecting means and an engine load detecting means by using a reference differential pressure ΔPo before and after an EGR valve. Next, by using a simple moving average value of a plurality of latest values of the observed differential pressure ΔP, an exhaust-side target EGR gas flow rate Qg is obtained again by pressure conversion. Then, based on an exhaust-side target EGR gas flow rate Qg, an observed differential pressure ΔP which is a simple traveling average value, and a target opening map M4, a differential pressure corrected target EGR valve opening La is obtained, and the EGR valve is actuated according to the target EGR valve opening La. <P>COPYRIGHT: (C)2013,JPO&INPIT |
