Method of calibrating clutches in transmissions

Details Method of calibrating clutches in transmissions Method of calibrating clutches in transmissions

1990-05-10

1991-02-05

Wright, Dirk

Machine element or mechanism

Gearing

Interchangeably locked

192 0096, F16H 546

Patent

active

049894714

ABSTRACT:
A microprocessor controlling a shuttle shift transmission may be programmed to effect a calibration of the final drive clutches in the transmission so that the microprocessor can efficiently effect engagement of each respective said clutch by applying the proper hydraulic pressure to cause proper engagement thereof. This method of calibrating the final drive clutches in the transmission includes braking the output shaft of the transmission so that any engagement of the selected final drive clutch being calibrated will cause a load to be applied to the engine. The hydraulic pressure is then incrementally increased until the engine RPM's decrease because of the load being placed on the engine. The value of this engagement hydraulic pressure is stored in the microprocessor for use when effecting engagement of the selected clutch during operation of the transmission. Service indicators are programmed into the microprocessor should the selected clutch not be capable of being calibrated.

REFERENCES:
patent: 4425620 (1984-01-01), Batcheller et al.
patent: 4646895 (1987-03-01), Horsch
patent: 4732246 (1988-03-01), Tateno et al.
patent: 4855913 (1989-08-01), Brekkestran et al.
patent: 4873637 (1989-10-01), Braun
1988 John Deere & Company Sales Brochure for 4-Wheel-Drive Tractors.
Operators Manual for Versatile Model 936 and 976 Tractors (Pertinent Pages are Attached.).

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