Control for automatic transmissions
A control system is described for vehicle automatic transmissions. The system comprises a hydraulic actuator means for engaging friction engaging means for establishing a driving gear train, hydraulic conduit means for supplying hydraulic pressure to the hydraulic actuator means, and a control valve means provided in the hydraulic conduit means to connect the actuator means alternately to hydraulic source means and drain conduit means. The system also includes a pressure reducing valve means provided in the drain conduit means for producing a pressure which is lower than a pressure for making the friction engaging means engage, vehicle speed detecting means for detecting vehicle speed and producing a low vehicle speed signal showing that the vehicle speed is below a predetermined value, and position detecting means for detecting position of an engine power control member and producing a position signal when the control member is in a low engine output position smaller than a predetermined position.
- Assignee:
- Mazda Motor Corp., Hiroshima
- Patent Number(s):
- US 4618042
- OSTI ID:
- 6999317
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
330602* -- Vehicle Design Factors-- Engine-Transmission Matching
BRAKES
CONTROL
CONTROL EQUIPMENT
CONTROL SYSTEMS
DRAINAGE
ELECTRONIC CIRCUITS
EQUIPMENT
FLOW REGULATORS
FRICTION
GEARS
HYDRAULIC CONTROL DEVICES
MACHINE PARTS
MEASURING INSTRUMENTS
MECHANICAL TRANSMISSIONS
POSITIONING
PRESSURE CONTROL
PRESSURIZING
SIGNALS
SPEED REGULATORS
TIMING CIRCUITS
VALVES
VEHICLES
VELOCIMETERS
VELOCITY