EGR controller for internal combustion engine

摘要

When a constant driving voltage is applied to a motor driving an EGR valve so that the EGR opening degree is varied, an angular speed of the EGR valve becomes minimal at a position where the driving torque of the EGR valve becomes maximal. In view of this, while an opening degree of the EGR valve is varied with a constant driving voltage applied to the motor, the EGR opening degree where the angular speed becomes minimal is learned as a full-close position.

主权项

1. An exhaust gas recirculation controller for an internal combustion engine, comprising:
an EGR valve controlling an exhaust gas quantity recirculating into an intake pipe, the EGR valve being driven in a direction where an opening degree of the EGR valve is increased and in a direction where the opening degree of the EGR valve is decreased with respect to a full-close position of the EGR valve where a rotating friction of the EGR valve becomes a maximal value; a driving-torque-information detecting portion for detecting a driving-torque information about a driving torque of the EGR valve; and a full-close-position learning portion for learning an opening degree of the EGR valve as a full-close position, based on the driving-torque information, where the driving torque of the EGR valve becomes maximal.