Speed change control method and device of automatic transmission for vehicle

Patent · Tue Feb 25 04:00:00 EST 1986

OSTI ID:6117476

Kinugasa, Y; Yaegashi, T

A speed change control device of an automatic transmission for a vehicle is described, the control device comprising: a first voltage producing means for producing voltage related with engine temperature; a second voltage producing means for producing voltage related with vehicle speed; a first comparator for comparing the output voltage of the first voltage producing means with a first predetermined value; a second comparator for comparing the output voltage of the second voltage producing means with a second predetermined value; an oil pressure supply controlling means for controlling oil pressure supply to a hydraulic servo for a friction engaging device upon receiving operating signals when a speed change stage producing a reduction gear ratio lower than a predetermined value is to be performed; and a blocking means for blocking input of the operating signals to the oil pressure supply controlling means only when the engine temperature is lower than the first predetermined value and the vehicle speed is lower than the second predetermined value in response to the outputs of the first and second comparators.

• Assignee: Toyota Jidosha Kogyo Kabushiki Kaisha, Toyota
• Patent Number(s): US 4572029
• OSTI ID: 6117476
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330602* -- Vehicle Design Factors-- Engine-Transmission Matching
CONTROL
CONTROL EQUIPMENT
ELECTRIC POTENTIAL
EQUIPMENT
FRICTION
GEARS
HYDRAULIC CONTROL DEVICES
LUBRICANTS
LUBRICATING OILS
MACHINE PARTS
MECHANICAL TRANSMISSIONS
OILS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
PETROLEUM PRODUCTS
PRESSURE CONTROL
SIGNALS
SPEED REGULATORS
TEMPERATURE DEPENDENCE
VEHICLES
VELOCITY