Apparatus for diagnosing automatic transmission based on engine

Details Apparatus for diagnosing automatic transmission based on engine Apparatus for diagnosing automatic transmission based on engine

1994-12-20

1996-05-07

Teska, Kevin J.

Boots, shoes, and leggings

36442401, 36442601, 477120, 477131, 477 81, 477107, 477125, 477126, 477906, 74335, 74336R, 74483PB, 475129, 475119, 475132, 475128, 731181, 731173, 180273, G06G 770, F16H 5948

Patent

active

055152724

ABSTRACT:
A diagnosing apparatus for diagnosing a vehicle automatic transmission system including an automatic transmission having frictional coupling devices, and solenoid-operated valves for controlling the frictional coupling devices to shift the automatic transmission according to shift commands generated by a control device, the apparatus including a speed detector for detecting an engine speed of the vehicle, a device for determining a reference range of the engine speed within which the engine speed is expected to fall when the transmission is placed in a position selected by a shift command, a device for determining whether a predetermined running condition of the vehicle is satisfied, and a defect detector for determining whether there exists a defect associated with the automatic transmission system, depending upon whether the detected engine speed is held within or outside the determined reference range when the predetermined vehicle running condition is satisfied.

REFERENCES:
patent: 3747438 (1973-07-01), Toyoda et al.
patent: 4367528 (1983-01-01), Kawamoto et al.
patent: 4473882 (1984-09-01), Suzuki et al.
patent: 4495576 (1985-01-01), Ito
patent: 5216938 (1993-06-01), Yamaguchi
patent: 5272631 (1993-12-01), Iwatsuki et al.
patent: 5393275 (1995-02-01), Okada et al.
patent: 5393278 (1995-02-01), Kyushima et al.

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