Direct-coupled control for a torque converter including a two stage speed responsive valve control

Patent · Tue Dec 16 04:00:00 EST 1986

OSTI ID:6859335

Nishikawa, M; Sakurai, Y; Takashi, A

A direct-coupling control system is described for a torque converter in an automatic transmission in a vehicle, the torque converter including an input member provided with a pump rotor and an output member provided with a turbine rotor. The transmission further includes a source of working oil pressure, a direct-coupling clutch interposed between the input and output members for mechanically coupling them together, the clutch including a hydraulic cylinder for actuation thereof, and an auxiliary transmission including stages of gear trains for transmitting the torque of the output member to a drive wheel. Each of the gear trains has a hydraulically operated friction element for actuation thereof, each friction element including a hydraulic cylinder; the direct-coupling control system comprising means interposed between the hydraulic cylinder of the direct-coupling clutch and the source of working oil pressure for controlling coupling force of the direct-coupling clutch by controlling working oil pressure to the hydraulic cylinder of the clutch in a first stage and a second stage. The first stage is wherein the coupling force is relatively small when speed of the vehicle is not more than a predetermined value and the second stage being wherein the coupling force is relatively large when speed of the vehicles is not less than the predetermined value; the means for controlling coupling force comprises an oil line connecting the source of working oil pressure to the hydraulic cylinder of the clutch, a reduction valve in the oil line for closing the oil line when the working oil pressure of the clutch reaches a predetermined level, and a vehicle speed response valve in the oil line in parallel with the reduction valve for opening the oil line when the speed of the vehicle exceeds the predetermined value.

• Assignee: Honda Giken Kogyo Kabushiki Kaisha, Tokyo
• Patent Number(s): US 4628767
• OSTI ID: 6859335
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330602* -- Vehicle Design Factors-- Engine-Transmission Matching
CONTROL
CONTROL EQUIPMENT
CONTROL SYSTEMS
CYLINDERS
EQUIPMENT
FLOW REGULATORS
FRICTION
HYDRAULIC CONTROL DEVICES
LUBRICANTS
LUBRICATING OILS
MACHINE PARTS
MACHINERY
MECHANICAL TRANSMISSIONS
OILS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
PETROLEUM PRODUCTS
PRESSURE CONTROL
PUMPS
ROTORS
SPEED REGULATORS
TORQUE
TURBINES
TURBOMACHINERY
VALVES
VEHICLES
VELOCITY