Method of detecting linear solenoid inter-terminal short of elec

Details Method of detecting linear solenoid inter-terminal short of elec Method of detecting linear solenoid inter-terminal short of elec

1996-09-06

1998-06-30

Karlsen, Ernest F.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

324415, 73168, G01R 3102

Patent

active

057739811

ABSTRACT:
A short between terminals of a linear solenoid controlled by an electronic control in an automatic transmission is detected by sensing when a PWM duty ratio set by a feedback control operating the linear solenoid is less than a reference duty ratio. The reference duty cycle is calculated to be between a range of expected normal duty ratios in the absence of the short and a range of expected short duty ratios in the presence of the short.

REFERENCES:
patent: 5202813 (1993-04-01), Uota et al.
patent: 5251091 (1993-10-01), Ito et al.
patent: 5345181 (1994-09-01), Mantani
patent: 5492009 (1996-02-01), Kempf
patent: 5548210 (1996-08-01), Dittrich
patent: 5572142 (1996-11-01), Muraki

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