LEAK DIAGNOSIS METHOD OF EXHAUST GAS RECIRCULATION USING ELECTRIC LEAD SIGNAL

• Main Authors: KIM, CHANG GI, KANG, KERN YONG, PARK, CHEL WOONG, OH, SEUNG MOOK, CHOI, YOUNG
• Format: Patent
• Language: English
• Published: 06.01.2010
• Subjects: BLASTING; CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TOTRANSPORTATION; COMBUSTION ENGINES; CONTROLLING COMBUSTION ENGINES; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; LIGHTING; MECHANICAL ENGINEERING; SUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLEMIXTURES OR CONSTITUENTS THEREOF; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; WEAPONS

PURPOSE: An EGR leakage diagnosis method using a commutation signal is provided to judge the leakage of the EGR valve according to the electric current apply between a valve housing and a valve and to supply data which is very useful for minutely controlling an EGR valve. CONSTITUTION: The leakage of an EGR(Exhaust Gas Recirculation) valve is judged according to the electric current apply between a valve housing(20) and an actuating rod(10). The actuating rod, a valve and the valve housing constitute a machinery exhaust gas recirculation valve. The actuating rod flows in the axial direction. The valve is connected to an end of the actuating rod, and opens and closes a valve seat. The actuating rod is installed in the valve housing. A first connection line(31a) and a second connection line(31b) are connected to the actuating rod and the valve housing and ends thereof are drawn to outside. A power supply unit(30) is connected to the first and second connection lines. A signal is detected by a signal detecting unit(32) electrically connected to a power supply unit.