Title:
CONTROL DEVICE FOR VARIABLE-DISPLACEMENT OIL PUMP AND CONTROL METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2019/176277
Kind Code:
A1
Abstract:
According to the present invention, in a state in which the speed of an internal combustion engine (1) is reduced, a target discharge pressure of operating oil supplied from a variable-displacement oil pump (54) is maintained at the current target discharge pressure, and the operating oil is supplied to a hydraulic VTC mechanism (26). Furthermore, after, preferably, an intake valve or an exhaust valve has reached a target phase angle or near the target phase angle, the discharge pressure of the operating oil is reduced, and the operating oil is supplied to the hydraulic VTC mechanism (26). Even in the state in which the speed of the internal combustion engine is reduced, because the discharge pressure of the operating oil from the variable-displacement oil pump (54) is not reduced, it is possible to obtain a quick action of the hydraulic VTC mechanism (26) and to make the valve close to the target phase angle in an early stage by improving the responsiveness of the hydraulic VTC mechanism (26).
Inventors:
SAGA KOJI (JP)
WATANABE KOTARO (JP)
WATANABE KOTARO (JP)
Application Number:
PCT/JP2019/001366
Publication Date:
September 19, 2019
Filing Date:
January 18, 2019
Export Citation:
Assignee:
HITACHI AUTOMOTIVE SYSTEMS LTD (JP)
International Classes:
F01M1/16; F01L1/356; F01M1/08
Foreign References:
| JP2014199011A | 2014-10-23 | |||
| JPH0763026A | 1995-03-07 | |||
| JP2016160922A | 2016-09-05 | |||
| JP2012062789A | 2012-03-29 |
Attorney, Agent or Firm:
KOBAYASHI, Hiromichi et al. (JP)
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