FUEL INJECTION CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE

• Main Authors: KUMANO MIKIO, NISHIMURA KAZUTOSHI, MORITSUGU MICHIYASU, MIZUTANI AKITOSHI
• Format: Patent
• Language: English
• Published: 08.06.1999
• Edition: 6
• 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

PROBLEM TO BE SOLVED: To shorten the current-carrying period of an electromagnetic coil of a PCV (a discharge quantity control valve) in a fuel forced feed stroke period. SOLUTION: The PCV of a supply pump to control a fuel pressure in a common rail to which an injector is connected is formed such that provided it is within a fuel forced feed stroke period by a cam lift, when a valve is closed once, a closing state is held by fuel pressure even when the saturated state of a PCV carried current is maintained. Thereby, a PCV drive signal to drive a PCV is outputted such that division into a first time at the beginning of the forced feed stroke and a second time ending to completion of the forced feed stroke period is effected. As noted above, by shortening a period in which a PCV carried current flows in the fuel formed feed stroke period, energy is reduced, and during this period, the heat generation of the electromagnetic coil of the PCV is suppressed. Further, fly back energy during disconnection of second time PCV carried current is recovered as a pilot main capacitor voltage with high efficiency.