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Patent Searching and Data


Title:
DIAGNOSING APPARATUS
Document Type and Number:
WIPO Patent Application WO/2008/062691
Kind Code:
A1
Abstract:
A diagnosing apparatus capable of detecting, with reliability, a ground short between a linear solenoid valve and a circuit for driving the same. A diagnosing apparatus (10) diagnoses a ground short between a drive circuit (2) and a linear solenoid valve (1). The drive circuit (2) comprises a switching means (3) that supplies, based on input ON/OFF signals, a current to the linear solenoid valve (1) to variably adjust the opening degree thereof; a current determining means (4) that determines the current flowing from the switching means (3) to the linear solenoid valve (1); and a control means (5) that outputs, based on a determined current value from the current determining means (4), the ON/OFF signals to the switching means (3) such that the linear solenoid valve exhibits a target opening degree. The diagnosing apparatus (10) has a ground short detecting means (5) that detects switchings of the ON/OFF signals inputted to the switching means (3) and that, if the number of switchings between ON and OFF per predetermined time period is equal to or less than a predetermined number, then determines that a fault of ground short has occurred.

Inventors:
EBARA TATSUHIKO (JP)
OHTA TOMOKO (JP)
Application Number:
PCT/JP2007/071978
Publication Date:
May 29, 2008
Filing Date:
November 13, 2007
Export Citation:
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Assignee:
ISUZU MOTORS LTD (JP)
EBARA TATSUHIKO (JP)
OHTA TOMOKO (JP)
International Classes:
F16H61/00; F16H61/16; F16H61/68; F16H61/682; F16K31/06; F16K51/00; F16H59/68
Foreign References:
JP2005236101A2005-09-02
JP2003166668A2003-06-13
JPH07194175A1995-07-28
JP2002231529A2002-08-16
JP2006152987A2006-06-15
Attorney, Agent or Firm:
KINUTANI, Nobuo (15-12 Nishi-Shimbashi 3-chom, Minato-ku Tokyo 03, JP)
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