초록 ▼

An exhaust passage is connected to an intake passage of an engine through an exhaust recirculating valve. A target opening of the exhaust recirculation valve is first set according to a target exhaust recirculation rate depending on engine running conditions, the total intake air flow cross-sectiona

An exhaust passage is connected to an intake passage of an engine through an exhaust recirculating valve. A target opening of the exhaust recirculation valve is first set according to a target exhaust recirculation rate depending on engine running conditions, the total intake air flow cross-sectional area of the engine, and a first correction value set according to the exhaust pressure. By applying this corrected value, the same EGR is always obtained on both low ground and high ground regardless of the engine running conditions. Preferably, the target opening is further corrected by a second correction value set based on the exhaust temperature.

대표청구항 ▼

[ The embodiments of this invention in which an exclusive property or privilege is claimed are defined as follows:] [1.] An exhaust gas recirculation controller for use with an engine, said engine comprising an intake passage and exhaust passage connected by an exhaust gas recirculation passage prov

[ The embodiments of this invention in which an exclusive property or privilege is claimed are defined as follows:] [1.] An exhaust gas recirculation controller for use with an engine, said engine comprising an intake passage and exhaust passage connected by an exhaust gas recirculation passage provided with an exhaust recirculation valve, comprising:means for detecting a running state of said engine,means for setting a target exhaust gas recirculation rate according to said running state,means for computing a total intake air flow cross-sectional area of said engine comprising said air intake passage,means for setting a first correction amount of said target exhaust gas recirculation rate according to an exhaust pressure of said engine,means for setting a target opening amount of said exhaust gas recirculation valve based on said target exhaust recirculation rate, total intake flow cross-sectional area and first correction value, andmeans for controlling the opening of said exhaust gas recirculating valve to the target opening.