Hydraulic pressure control apparatus of belt-drive...

Details Hydraulic pressure control apparatus of belt-drive... Hydraulic pressure control apparatus of belt-drive...

2005-07-21

2008-10-14

Pang, Roger (Department: 3681)

Interrelated power delivery controls, including engine control

Transmission control

Continuously variable friction transmission

C477S045000, C477S115000

Reexamination Certificate

active

07435200

ABSTRACT:
A hydraulic pressure control apparatus of a belt-drive continuously variable transmission (CVT) for an automotive vehicle, includes a vehicular information detector that detects engine-and-vehicle operating conditions and a hydraulic actuator that regulates primary and secondary pulley pressures. A CVT control unit calculates a primary-pulley slip-limit pulley thrust and a secondary-pulley slip-limit pulley thrust based on information about the engine-and-vehicle operating conditions. The CVT control unit sets a primary-pulley-thrust command value to the primary-pulley slip-limit pulley thrust and calculates a desired secondary pulley thrust based on a desired transmission ratio, when a pulley ratio is greater than or equal to 1. The CVT control unit sets a secondary-pulley-thrust command value to the secondary-pulley slip-limit pulley thrust and calculates a desired primary pulley thrust suited to the desired transmission ratio, when the pulley ratio is less than 1.

REFERENCES:
patent: 7229372 (2007-06-01), Shimanaka et al.
patent: 7384372 (2008-06-01), Katou
patent: 405141515 (1993-06-01), None
patent: 2001-173770 (2001-06-01), None

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