Automatic transmission for automotive vehicles
This patent describes an automatic transmission for an automotive vehicle, equipped with a hydraulic torque converter having direct-coupling means. The automatic transmission is characerized by consisting of at least two pilot valves formed of solenoid valves that are arranged in series with each other. The solenoid valves are adapted to regulate in a stepwise manner the pressure of operating fluid any apply the thus controlled pressure to the direct-coupling means of the hydraulic torque converter. A device is adapted to detect running conditions of the automotive vehicle and controls the opening and closing action of each of the solenoid valves in accordance with a control map which has been set previously. The operating fluid is inhibited from escaping through at least one of the solenoid valves when the solenoid valves are in a position to regulate the pressure of operating fluid to a high level. The high level pressure is applied to the direct-coupling means of the hydraulic torque converter. One of the at least two pilot valves consists of a valve body having a bore, a valve spool in the bore movable between an opened position and a closed position. A first chamber in the bore is at one end of the spool. A second chamber in the bore is at the other end of the said spool. A spring in the first chamber biases the spool towards the opened position, an inlet port, an outlet port, means permitting pressure to enter the first and second chambers, a restriction opening into the first chamber, a solenoid having an armature which when energized opens the restriction and when deenergized blocks the restriction, and an opening to drain downstream of the restriction.
- Assignee:
- Honda Giken Kogyo Kabushiki Kaisha, Tokyo
- Patent Number(s):
- US 4579208
- OSTI ID:
- 5702173
- Resource Relation:
- Patent File Date: Filed date 19 Jan 1984
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
MECHANICAL TRANSMISSIONS
DESIGN
VEHICLES
ARMATURES
HYDRAULIC CONTROL DEVICES
POSITIONING
PRESSURE CONTROL
SOLENOIDS
TORQUE
VALVES
CONTROL
CONTROL EQUIPMENT
ELECTRIC COILS
ELECTRICAL EQUIPMENT
EQUIPMENT
FLOW REGULATORS
MACHINE PARTS
330602* - Vehicle Design Factors- Engine-Transmission Matching