Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1980-11-10
1982-09-21
Braun, Leslie
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
74856, 74861, B60K 4108, B60K 4110
Patent
active
043500587
ABSTRACT:
The disclosed control system regulates changes of gear ratio in an automatic transmission for a vehicle. A supervisory control arrangement monitors operator input commands through the shift range selector lever, and receives a desired-ratio command either from a shift point computer or from a manual gear shift selector. When the supervisory control arrangement determines that the desired-ratio signal differs from the actual ratio, the monitoring function is interrupted and a shift-initiate command is provided. This command is utilized to assign certain components for use in a shift quality control arrangement, for effecting the controlled ratio change. A torque output signal from the vehicle drive line is used in conjunction with the shift quality control arrangement. After the shift is completed, the previously assigned components are released and the supervisory control arrangement resumes the monitoring of the desired ratio as contrasted to the actual gear ratio. One circuit controls all the upshifts, whether 1-2, 2-3, or 3-4, and one other circuit controls all the downshifts. This assignment of certain components for each controlled ratio change, and their release so they can be re-used in subsequent ratio changes, contributes to a cost-effective trade-off between the number of circuits required in the total system and the complexity of the logic circuits actually employed.
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"Ratio Changing the Passenger Car Automatic Transmission", Winchell et al., Chapter 10 of the SAE Publication Design Practices--Passenger Car Automatic Transmissions.
Ivey John S.
Miller Alan L.
Borg-Warner Corporation
Braun Leslie
Jennings, Jr. James J.
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