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Patent Searching and Data


Title:
CONTROL DEVICE AND CONTROL METHOD FOR CAM DRIVING TYPE ELECTRONIC CONTROL UNIT INJECTOR
Document Type and Number:
WIPO Patent Application WO/1998/032965
Kind Code:
A1
Abstract:
A control device and control method for cam driving type electronic control unit injectors, in which driving force transmitting parts will not separate from a cam even when a high injection pressure is used. Thus the control device comprises a feed and pressure passage (18) for providing communication between an oil reservoir (16a) and a plunger chamber (11c), a valve (13) for opening and closing the feed and pressure passage (18), a first solenoid valve (14) for moving the valve (13) during an exhaust stroke to close the feed and pressure passage (18) to raise a pressure in the plunger chamber (11c), a spring (15) for biasing the valve (13) to open the feed and pressure passage (18), and control means (20) for supplying a smaller current than that when the valve (13) is moving during the exhaust stroke, through the first solenoid valve (14) for a predetermined period of time (AV2) after the lapse of a predetermined period of time (T2) immediately after completion of main injection to move the valve (13) in a closing direction of the feed and pressure passage (18) to thereby output a command for raising a pressure in the plunger chamber (11c).

Inventors:
SAKASAI TAKASHI (JP)
Application Number:
PCT/JP1998/000255
Publication Date:
July 30, 1998
Filing Date:
January 23, 1998
Export Citation:
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Assignee:
KOMATSU MFG CO LTD (JP)
SAKASAI TAKASHI (JP)
International Classes:
F02D41/40; F02M57/02; F02M59/10; F02M59/36; F02M51/00; F02M59/44; F02M59/46; (IPC1-7): F02M57/02; F02M51/00; F02M59/44; F02D41/40
Foreign References:
JPH08158986A1996-06-18
JPH01237353A1989-09-21
JPS593160A1984-01-09
JPS5891337A1983-05-31
Attorney, Agent or Firm:
Hashizume, Yoshihiko (3-6 Akasaka 2-chom, Minato-ku Tokyo 107, JP)
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