Full-close referential position detecting method of egr valve in internal-combustion engine

Abstract

Abstract PURPOSE:To perform accurate EGR control continuously by updating the full- close referential opening of EGR valve for each sampling signal to the level detected at each sampling signal under starting state of engine. CONSTITUTION:Under engine operation, ECU5 will receive parameter signals from various sensors 4, 8-11, 15-17 to operate the target opening of EGR valve 19 in accordance to predetermined control program. When such state as having zero target opening continues for predetermined time, the output level from a valve lift sensor 24 after elapsing said predetermined time is considered to be the full-close referential opening which is subtracted from the detected valve opening to produce the actual valve opening. If the engine is under starting state, said full-close referential opening is updated for every sampling signal to the level detected for said sampling signal. Consequently, setting of the full-close referential opening is performed correctly.

Inventors

• 👤 Shunpei Hasegawa
• 👤 俊平 長谷川
• 👤 Noriyuki Kishi
• 👤 岸　則行

Bibliographic Details