Hydraulic control system for lock-up clutch of torque converter
A hydraulic control system is described for an automatic transmission of an automotive vehicle having an engine, comprising: a pump driven by the engine to discharge hydraulic fluid; a torque converter including a torque converter cavity, an impeller, and a turbine which are disposed in the torque converter cavity, the torque converter including a lock-up clutch which has a lock-up clutch piston movably disposed within the torque converter cavity to divide same into a lock-up release chamber and a working chamber in which the impeller and the turbine are disposed; a line pressure regulator valve connected to the pump to regulate the hydraulic fluid discharged by the pump and generate a line pressure. The line pressure regulator valve has a port and includes a means for establishing a fluid communication path between the port and the pump when the line pressure is higher than a predetermined value to allow a portion of the hydraulic fluid discharged by the oil pump to flow to the port; means communicating with the port for effecting fluid supply to the lock-up release chamber and the working chamber; and means for establishing a restricted flow communication path between the port and the pump when the line pressure is less than the predetermined value.
- Assignee:
- Nissan Motor Co., Ltd., Yokohama
- Patent Number(s):
- US 4618036
- OSTI ID:
- 5060387
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
330602* -- Vehicle Design Factors-- Engine-Transmission Matching
CONTROL EQUIPMENT
ENGINES
EQUIPMENT
FLOW REGULATORS
FLUID FLOW
FLUIDS
HYDRAULIC CONTROL DEVICES
HYDRAULIC FLUIDS
MACHINE PARTS
MACHINERY
MECHANICAL TRANSMISSIONS
PISTONS
PRESSURE REGULATORS
PUMPS
TORQUE
TURBINES
TURBOMACHINERY
VALVES
VEHICLES
WORKING FLUIDS