Title:
FAULT DETECTION DEVICE FOR FUEL SUPPLY SYSTEM
Document Type and Number:
WIPO Patent Application WO/2012/123985
Kind Code:
A1
Abstract:
In order to provide a low-cost fuel supply system fault detection device capable of reliably detecting faults in the fuel pressure switching operation in a fuel supply system with which the fuel pressure can be switched, in a fuel supply system equipped with a fuel pump unit (11) that supplies fuel to an injector (3) of an engine (1), a pressure regulator (20) capable of adjusting the fuel pressure to any of multiple different pressure settings, and a set pressure switching mechanism (40) that operates the pressure regulator (20) so as to switch the pressure setting, this fault detection device is equipped with: a status change detection unit (51a), which operates the set pressure switching mechanism (40) so as to switch the pressure setting from a low-pressure-side pressure setting to a high-pressure-side pressure setting when the amount of fuel supplied to the injector (3) becomes approximately constant, and which detects a change in status related to the energization of a pump drive motor (11m) after the pressure setting has been switched; and a fault determination unit (51b), which determines on the basis of that detection information whether a fault has occurred in the switching of the pressure setting.
Inventors:
SUDA TORU (JP)
Application Number:
PCT/JP2011/001465
Publication Date:
September 20, 2012
Filing Date:
March 14, 2011
Export Citation:
Assignee:
TOYOTA MOTOR CO LTD (JP)
SUDA TORU (JP)
SUDA TORU (JP)
International Classes:
F02M37/00; F02D45/00; F02M37/08
Foreign References:
| JPH05321737A | 1993-12-07 | |||
| JP2010255471A | 2010-11-11 | |||
| JP2004162529A | 2004-06-10 | |||
| JP2007315378A | 2007-12-06 |
Attorney, Agent or Firm:
ARIGA, Gunichiro et al. (JP)
Ariga Army Ichiro (JP)
Ariga Army Ichiro (JP)
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Claims: