Machine element or mechanism – Gearing – Interchangeably locked
Patent
1990-05-10
1991-02-12
Wright, Dirk
Machine element or mechanism
Gearing
Interchangeably locked
3644241, F16H 542
Patent
active
049914553
ABSTRACT:
A power shift transmission is operably controlled by a microprocessor that will effect a deceleration of the vehicle at relatively high speeds by effecting a downshifting of the transmission in response to a sensing of the rate of rotation of the output shaft such that the gears in the transmission are selected so that the transmission and/or the vehicle engine becomes a load for decelerating the vehicle. The microprocessor does not effect a downshifting of the transmission whenever the sensed rate of rotation of the output shaft would cause an overspeeding of the engine in the lower gear. The microprocessor runs a strategy determination check prior to entering a high speed deceleration routine to determine if a more efficient deceleration routine would be more effective, as based upon the pre-sensed rate of rotation of the output shaft.
REFERENCES:
patent: 4425620 (1984-01-01), Batcheller et al.
patent: 4622866 (1986-11-01), Ito et al.
patent: 4646895 (1987-03-01), Horsch
patent: 4671139 (1987-06-01), Downs et al.
patent: 4753134 (1988-01-01), Hayasaki
patent: 4855913 (1989-08-01), Brekkestran et al.
1988 John Deere & Company Sales Brochure for 4-Wheel-Drive Tractors.
Operators Manual for Versatile Model 936 and 976 Tractors (Pertinent Pages are attached.).
Ford New Holland Inc.
Wright Dirk
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