Control system and method for automatic transmission for automotive vehicle

Patent · Tue Mar 04 04:00:00 EST 1986

OSTI ID:5775205

Hamada, H; Morimoto, Y; Suga, M; Murasugi, T; Suziki, T

A control system is described for an automatic transmission for an automotive vehicle engine having an accelerator that actuates a throttle which opens in degrees and which is mounted within an induction pipe wherein an intake manifold vacuum develops, the transmission including a high gear ratio and a lower gear ratio. The control system consists of: means for generating a throttle fluid pressure variable with the intake manifold vacuum; means for generating a governor fluid pressure variable with a vehicle speed of the automotive vehicle; means responsive to the throttle fluid pressure and the governor fluid pressure for changing the automatic transmission between the high gear ratio and the lower gear ratio; means for generating a vehicle speed signal indicating that the vehicle speed of the automotive vehicle is lower than a predetermined vehicle speed value; means for generating a throttle opening signal indicating that the throttle opening degree is larger than a predetermined opening degree value; and means responsive to the vehicle speed signal and the throttle opening signal for forcing the automatic transmission to downshift from the high gear ratio to the lower gear ratio.

• Assignee: Nissan Motor Co., Ltd.
• Patent Number(s): US 4573375
• OSTI ID: 5775205
• 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
EQUIPMENT
GEARS
MACHINE PARTS
MECHANICAL TRANSMISSIONS
PIPES
PRESSURE CONTROL
SIGNALS
SPEED REGULATORS
VEHICLES
VELOCITY