Calibration system for a power shift transmission

Details Calibration system for a power shift transmission Calibration system for a power shift transmission

1998-08-10

2000-02-15

Estremsky, Sherry L.

Machine element or mechanism

Gearing

Interchangeably locked

477155, F16H 5914

Patent

active

060239883

ABSTRACT:
A method and system for calibrating at least one clutch in a transmission whereby the incipient engagement pressure of the fluid in the clutch may be determined. Two shafts in the transmission are locked together in mutually incompatible gear ratios thereby preventing their free relative rotation. The output of the clutch is connected to these shafts to prevent its free rotation. The input of the clutch is connected to the engine to cause it to rotate. The clutch is then gradually engaged as the load on the engine is monitored, preferably by measuring changes in the fuel flow rate to the engine. Once the engine load increases a predetermined amount, the system saves the particular valve command signal that produced the incipient engagement pressure and the process ends. The method is preferably performed entirely under microprocessor control, thereby eliminating the need for operator intervention during the process.

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patent: 5551930 (1996-09-01), Creger et al.
patent: 5853076 (1998-12-01), McKee et al.

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