Hydraulic control valve system for an automatic multiple-speed transmission with a lockup torque converter and electronically operated lockup control
Patent
·
OSTI ID:6053526
This patent describes a control system for an automatic transmission in an engine powered vehicle comprising a pressure source; a clutch and brake means for effecting ratio changes including two top ratios and at least one lower, underdrive ratio; a hydrokinetic torque converter having a turbine connected to torque input portions of the gearing and an impeller connected to the engine; a pressure operated lockup clutch means in the converter for directly connecting the turbine and the impeller; a control circuit including pressure operated means for sequentially actuating the clutch and brake means and ratio shift valve means for controlling distribution of pressure from the source to the pressure operated means; a converter clutch shift valve and a converter clutch shuttle valve in portions of the circuit connecting the pressure source to the lockup clutch means; and a source of an engine torque signal and a source of a vehicle speed signal connected to the converter clutch shift valve whereby the latter is shifted between a lockup clutch engaging position and lockup clutch disengaging position depending upon the relative values of vehicle speed and engine torque.
- Assignee:
- Ford Motor Co., Dearborn, MI
- Patent Number(s):
- US 4817473
- OSTI ID:
- 6053526
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
33 ADVANCED PROPULSION SYSTEMS
330602* -- Vehicle Design Factors-- Engine-Transmission Matching
99 GENERAL AND MISCELLANEOUS
990220 -- Computers
Computerized Models
& Computer Programs-- (1987-1989)
COMPUTERIZED CONTROL SYSTEMS
CONTROL
CONTROL EQUIPMENT
CONTROL SYSTEMS
ELECTRONIC CIRCUITS
EQUIPMENT
FLOW REGULATORS
FLUID MECHANICS
GEARS
HYDRAULICS
MACHINE PARTS
MACHINERY
MECHANICAL TRANSMISSIONS
MECHANICS
PRESSURE CONTROL
TORQUE
TURBINES
TURBOMACHINERY
VALVES
330602* -- Vehicle Design Factors-- Engine-Transmission Matching
99 GENERAL AND MISCELLANEOUS
990220 -- Computers
Computerized Models
& Computer Programs-- (1987-1989)
COMPUTERIZED CONTROL SYSTEMS
CONTROL
CONTROL EQUIPMENT
CONTROL SYSTEMS
ELECTRONIC CIRCUITS
EQUIPMENT
FLOW REGULATORS
FLUID MECHANICS
GEARS
HYDRAULICS
MACHINE PARTS
MACHINERY
MECHANICAL TRANSMISSIONS
MECHANICS
PRESSURE CONTROL
TORQUE
TURBINES
TURBOMACHINERY
VALVES