PURPOSE: To suppress discharge of NOx by controlling the EGR amount in synchronization with the switching of valve timing and increasing the EGR amount in case of partial loading, in an internal-combustion engine equipped with an EGR apparatus and a variable valve-timing mechanism.
CONSTITUTION: A passage 98 for bypassing an EGR valve 38 is formed, and an opening and closing valve 100 is installed. Said opening and closing valve 100 is connected to an actuator 102, which is driven in synchronization with the valve timing switching signal supplied from a control system 82. The signal sent into the EGR actuator 102 is made low, in synchronization with the switching to the valve-timing advance side, and the opening and closing valve 100 is opened. Therefore, exhaust gas is permitted to flow through the bypass passage 98, and the EGR amount can be increased relatively.
UMEHANA TOYOICHI
SHIBATA YOSHIAKI
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