Bibliographic Citation
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| Title | Method of calibrating clutches in transmissions |
| Creator/Author | Bulgrien, G.H. |
| Publication Date | 1991 Feb 05 |
| OSTI Identifier | OSTI ID: 5280510 |
| Report Number(s) | US 4989471 ;A |
| Other Number(s) | Pat. Priority: US 7-521808 |
| Resource Type | Patent |
| Specific Type | Special Availability |
| Resource Relation | Pat. File: 10 May 1990 |
| Subject | 330602 -- Vehicle Design Factors-- Engine-Transmission Matching; GEARS-- CALIBRATION;MECHANICAL TRANSMISSIONS-- GEARS; HYDRAULICS;OPERATION;SHAFTS |
| Related Subject | FLUID MECHANICS;MACHINE PARTS;MECHANICS |
| Description/Abstract | This paper describes a microprocessor controlling a shuttle shift transmission programmed to effect a calibration of the final drive clutches in the transmission so that the microprocessor can efficiently effect engagement of each respective 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. |
| Country of Publication | United States |
| Language | English |
| Format | Pages: (13 p) |
| Availability | Patent and Trademark Office, Box 9, Washington, DC 20232 (USA) |
| Rights | Ford New Holland, Inc., New Holland, PA (USA) |
| System Entry Date | 2001 May 13 |
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Last Updated: 02/11/2009