Shift scheduling method for clutch energy limitation

Details Shift scheduling method for clutch energy limitation Shift scheduling method for clutch energy limitation

1990-10-23

1991-12-10

Herrmann, Allan D.

Machine element or mechanism

Rotary member or shaft indexing, e.g., tool or work turret

Preselected indexed position

74844, 3644241, 192 0076, 192 82T, B60K 4106, F16D 2300

Patent

active

050707469

ABSTRACT:
An improved method of scheduling ratio shifting in a vehicle transmission adaptively adjusts the normal shift schedule to avoid shift-related overheating of the torque transmitting devices of the transmission. In normal operation, transmission shifting is scheduled by comparing measured vehicle speed and engine throttle position values with predefined load data. In the background, the transmission controller determines the cumulative thermal energy stored in the torque transmitting devices. If excessive energy is indicated, the normal shift schedule is modified to allow extended operation in the lower speed ratios. When the cumulative energy indication returns to a normal level, normal shift scheduling is resumed.

REFERENCES:
patent: 4567969 (1986-02-01), Makita
patent: 4576263 (1986-03-01), Lane et al.
patent: 4989470 (1991-02-01), Bulgrien
patent: 5025686 (1991-06-01), Sato et al.

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