EXHAUST GAS RECIRCULATION SYSTEM FOR INTERNAL COMBUSTION ENGINE

• Main Author: OHASHI MICHIHIRO
• Format: Patent
• Language: English
• Published: 23.05.1989
• Subjects: BLASTING; COMBUSTION ENGINES; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; LIGHTING; MECHANICAL ENGINEERING; SUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLEMIXTURES OR CONSTITUENTS THEREOF; WEAPONS

PURPOSE:To improve the accuracy of control with a simple circuit by decreasing a learning value if EGR valve opening is more than the specified value, but increasing the learning value if it is less than the specified value, when learning conductions are materialized. CONSTITUTION:Each detected value of an air flow meter 13, a cooling water temperature sensor 28, a valve opening detecting switch 45 being turned to ON when an EGR valve 3 is lifted to the specified value, a turning angle sensor 54, a car speed sensor 79, etc., is inputted into a control circuit 52, and thereby lift of the EGR valve 36 is controlled via a vacuum switching valve 40. When the control circuit 52 judges a steady driving state that any of car speed, intake air quantity and engine speed is within the specified range, it discriminates whether the valve opening switch 45 is on or off. When it is on, a learning value to the vacuum switching valve 40 is decreased, and when it is off, the learning value is increased the other way.