Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1977-08-11
1980-06-24
Braun, Leslie
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
B60K 4104
Patent
active
042089255
ABSTRACT:
A control for the automatic shifting of a multi-ratio power transmission. A memory is provided and programmed with the optimum vehicle speed shift points for upshift and downshift from each gear of the automatic range. The actual speed of the vehicle is periodically sampled, and each time it is, such speed is compared with the shift points for the gear which the transmission is in to see if a shift from such gear should be made. If it is determined from the speed sample that an upshift should be made, then the upshift speed points of higher gears are examined with reference to such speed sample to find the gear to which the transmission should be upshifted, i.e., the gear just above the highest gear having an upshift speed point which is less than the sampled speed. Having found such gear, the transmission is shifted thereto. Correspondingly, if it is determined from the speed sample that a downshift should be made (or can be made, in the event of a forced downshift condition), the downshift speed points of lower gears are examined with reference to such speed to find the gear to which a downshift should be made, i.e., the gear just below the lowest gear having a downshift speed point above the sampled speed. At any time, the operator may set any gear in the automatic range as the highest gear so that the transmission will not upshift beyond such gear.
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"Automatic Shift Control for Heavy Duty Transmissions", J. W. Schmidt, SAE Paper No. 720753, Sep. 1972.
"Electronically Controlled Semi-Automatic Transmissions for Heavy-Duty Trucks", Gerald L. Myers, SAE Paper No. 740266, Feb. 1974.
Miller Robert G.
Render Michael L.
Braun Leslie
Caterpillar Tractor Co.
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