Hydraulic transmission control system

Details Hydraulic transmission control system Hydraulic transmission control system

1989-08-25

1991-08-27

Herrmann, Allan D.

Machine element or mechanism

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

Preselected indexed position

74844, 74867, B60K 4114

Patent

active

050423282

ABSTRACT:
A hydraulic control system for controlling a transmission of an automotive vehicle has a hydraulic pump driven by an engine to deliver a line pressure and a regulator valve for regulating the line pressure according to a pilot pressure applied thereto. To change the pilot pressure so as to regulate the line pressure to a desired pressure, a duty solenoid valve is operated at a proper duty rate with a steady signal. The steady signal for operating the duty solenoid valve at the desired duty rate is provided at a frequency which is changed according to operating conditions of the automotive vehicle.

REFERENCES:
patent: 4565110 (1986-01-01), Ito
patent: 4595035 (1986-06-01), Warrick
patent: 4628773 (1986-12-01), Itoh et al.
patent: 4779489 (1988-10-01), Haley
patent: 4858496 (1989-08-01), Iwatsuki et al.

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