Method and apparatus for controlling continuously variable transmission for vehicle

Patent · Tue Mar 10 04:00:00 EST 1987

OSTI ID:6740529

Osanai, A; Gono, T; Niwa, T

An apparatus is described for controlling a speed ratio of a continuously variable transmission for a vehicle wherein an engine is provided with an intake gas through an intake manifold connected to the engine. The transmission has an input shaft operatively connected to the engine and an output shaft operatively connected to drive wheels of the vehicle. The apparatus comprises: pressure sensor disposed in the intake manifold; a first rotation sensor operable to sense a rotating speed of the input shaft, for detecting a rotating speed of the engine; a second rotation sensor operable to sense a rotating speed of the output shaft, for detecting a running speed of the vehicle; and a microcomputer including engine output determining means for determining a current actual output of the engine based on the detected rotating speed thereof and on the detected vacuum pressure in the intake manifold. The microcomputer further includes memory means for storing a predetermined relation among the target speed of the engine, the running speed of the vehicle and the actual output of the engine. The relation is predetermined for increasing the target speed of the engine with the detected running speed of the vehicle and for attaining required output of the engine with a minimum specific fuel consumption.

• Assignee: Toyota Jidosha Kabushiki Kaisha, Toyota
• Patent Number(s): US 4649487
• OSTI ID: 6740529
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330602* -- Vehicle Design Factors-- Engine-Transmission Matching
COMPUTERIZED CONTROL SYSTEMS
COMPUTERS
CONTROL EQUIPMENT
CONTROL SYSTEMS
ELECTRONIC CIRCUITS
ENERGY CONSUMPTION
ENGINES
EQUIPMENT
FUEL CONSUMPTION
INTAKE STRUCTURES
MACHINE PARTS
MEASURING INSTRUMENTS
MECHANICAL STRUCTURES
MECHANICAL TRANSMISSIONS
MEMORY DEVICES
MICROELECTRONIC CIRCUITS
MICROPROCESSORS
MOTION
PRESSURE GAGES
ROTATION
SHAFTS
SPEED REGULATORS
VEHICLES
VELOCITY
WHEELS