Title:
CONTROL DEVICE FOR ELECTRIC WATER PUMP
Document Type and Number:
WIPO Patent Application WO/2012/176292
Kind Code:
A1
Abstract:
With an electric water pump that circulates cooling water for an engine mounted in a vehicle or the like, the time interval for switching of the energization phase of the pump motor is set longer than during normal flow volume control (during flow volume control at a flow volume equal to or greater than the flow volume at which the electromotive force generated at the non-energization phase can be detected), and when the pump discharge pressure (or the temperature of the cooling water) repeatedly increases and decreases in this extremely low flow volume state, it is determined that the electric water pump is rotating correctly as required. By means of such a control it is possible to achieve an extremely low flow-volume control which is not possible with conventional control. Thus, with respect to controlling the stopping of the engine cooling system water, it is possible to provide an extremely low flow volume state, between a state in which the water is stopped and a state in which the water is circulating.
Inventors:
ARAKI YUKARI (JP)
SHINTANI OSAMU (JP)
SHIKIDA TAKASUKE (JP)
SHINTANI OSAMU (JP)
SHIKIDA TAKASUKE (JP)
Application Number:
PCT/JP2011/064252
Publication Date:
December 27, 2012
Filing Date:
June 22, 2011
Export Citation:
Assignee:
TOYOTA MOTOR CO LTD (JP)
ARAKI YUKARI (JP)
SHINTANI OSAMU (JP)
SHIKIDA TAKASUKE (JP)
ARAKI YUKARI (JP)
SHINTANI OSAMU (JP)
SHIKIDA TAKASUKE (JP)
International Classes:
F01P7/14
Foreign References:
| JP2006336626A | 2006-12-14 | |||
| JPH10210783A | 1998-08-07 | |||
| JP2008180160A | 2008-08-07 | |||
| JP2008215183A | 2008-09-18 | |||
| JPH11159379A | 1999-06-15 |
Attorney, Agent or Firm:
ARC PATENT ATTORNEYS' OFFICE (JP)
Patent business corporation ARC PATENT ATTORNEYS' OFFICE (JP)
Patent business corporation ARC PATENT ATTORNEYS' OFFICE (JP)
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Claims: