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Title:
DETECTION OF FAULT IN INJECTOR APPARATUS
Document Type and Number:
Japanese Patent JP2012013093
Kind Code:
A
Abstract:

To provide a fault detection method for detecting short-circuit faults in an injector apparatus at engine start-up.

This injector apparatus includes one or a plurality of piezoelectric fuel injectors 12a, 12b which are connected in a drive circuit 20. In one aspect, potential VB at a bias point PB in the drive circuit is determined and compared with a predicted voltage VPB. A short circuit fault signal is generated if the potential at the bias point is not within a predetermined tolerance voltage VTOL of the predicted voltage. In another aspect of the invention, a first charge pulse is applied to the injectors to charge the injectors. A discharge current path 38 is formed during a delay period Δt following the first charge pulse by closing a discharge switch Q2. A faulty injector may discharge through the discharge current path during the delay period Δt. A second charge pulse is applied to the injectors following the delay period. A current flow IS is sensed during the second charge pulse, and a short-circuit warning signal is generated if the current flow during the second charge pulse exceeds a predetermined threshold current.


Inventors:
PERRYMAN LOUISA J
Application Number:
JP2011000231023
Publication Date:
January 19, 2012
Filing Date:
October 20, 2011
Export Citation:
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Assignee:
DELPHI TECHNOLOGIES HOLDING
International Classes:
F02D41/22; F02D45/00; F02M51/06
Domestic Patent References:
JP2002246667A2002-08-30
JP2001349241A2001-12-21
JP2002252990A2002-09-06
JPH0573157A1993-03-26
Foreign References:
WO2005028836A12005-03-31
WO2005106227A12005-11-10
Attorney, Agent or Firm:
小野 新次郎
小林 泰
千葉 昭男
富田 博行
西山 文俊