| 摘要 |
PROBLEM TO BE SOLVED: To secure an optimal EGR gas volume without being affected by the intake gas pressure or emission pressure of an engine 70 in an emission recirculation system of an engine device. SOLUTION: This emission recirculation system includes an emission control system 50 arranged in an exhaust system of the engine 70, an EGR device 90 for refluxing part of the emission from the exhaust system to the intake system as an EGR gas, a pressure difference detecting means 84 for detecting a pressure differenceΔP between the intake air pressure of the intake system and the emission pressure of the exhaust system, a revolution speed detecting means 14 for detecting an engine revolution speed Ne, and a load detecting means 16 for detecting an engine load LF. A target EGR gas flow volume Qg is calculated from a relationship between the detected result Ne of the revolution speed detecting means 14 and the detected result LF of the load detecting means 16. Based on the relationship between detected results of the EGR target gas flow volume Qg and pressure difference detecting means 84, a target EGR valve opening degree La is calculated. Then, an EGR valve 93 is allowed to operate depending on the target EGR valve opening degree La. COPYRIGHT: (C)2012,JPO&INPIT |
