Hydraulic control apparatus for hydraulically-operated power transmitting system having continuously variable transmission

Patent · Tue Aug 11 04:00:00 EDT 1987

OSTI ID:5926648

Itoh, H

A hydraulic control apparatus is described for controlling a hydraulically-operated power transmitting system for an automotive vehicle, the power transmitting system including a continuously variable transmission and an auxiliary transmission coupled to the continuously variable transmission, the auxiliary transmission having a first and second forward-drive position corresponding to a high and a low speed range, respectively, which high and low speed ranges are selected by an operator controlled shift lever. The hydraulic control apparatus consists of: a shift valve controlled by an electric control signal so as to be placed selectively in one of a high-range position and a low range position to place the auxiliary transmission in the first and second forward-drive positions, respectively, the shift valve comprising lock means for holding the shift valve in the high-range position, irrespective of the electric control signal, while the high speed range is selected by the shift lever.

• Assignee: Toyota Jidosha Kabushiki Kaisha, Aichi
• Patent Number(s): US 4685358
• OSTI ID: 5926648
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330602* -- Vehicle Design Factors-- Engine-Transmission Matching
CONTROL EQUIPMENT
EQUIPMENT
FLOW REGULATORS
HYDRAULIC CONTROL DEVICES
MACHINE PARTS
MECHANICAL TRANSMISSIONS
SIGNALS
SPEED REGULATORS
VALVES
VEHICLES
VELOCITY