Control system and method for controlling output type hydraulic fluid pump of automatic transmission providing increased pump output pressure with increase in engine load

Patent · Tue Sep 15 00:00:00 EDT 1987

OSTI ID:6116637

Nakamura, S; Kubo, S; Taga, Y

This patent describes a control method for a hydraulic fluid pump comprised in a hydraulically actuated automatic transmission system for a vehicle driven by an engine. The transmission system has hydraulic means for establishing a speed ratio. The hydraulic means uses hydraulic fluid at a line pressure maintained by the hydraulic fluid pump. The method consists of: detecting the load on the engine; and controlling the hydraulic fluid pump such that an output thereof increases with an increase of the detected value of the load on the engine. In a hydraulically actuated automatic transmission system for a vehicle driven by an engine, the transmission system having hydraulic means for establishing a speed ratio and hydraulic fluid pump means for supplying pressurized hydraulic fluid to the means for establishing at a line pressure, a control system consists of: means for detecting the load on the engine; and means for controlling the hydraulic fluid pump such that an output increases with an increase of the detected value of the load on the engine.

• Assignee: Toyota Jidosha Kabushiki Kaisha, Toyota
• Patent Number(s): US 4693081
• OSTI ID: 6116637
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
AUTOMATION
CONTROL
CONTROL EQUIPMENT
CONTROL SYSTEMS
DESIGN
DETECTION
DYNAMIC LOADS
ENGINES
EQUIPMENT
FLUID MECHANICS
FLUIDS
HEAT ENGINES
HYDRAULIC EQUIPMENT
HYDRAULIC FLUIDS
HYDRAULICS
INTERNAL COMBUSTION ENGINES
MACHINE PARTS
MECHANICAL TRANSMISSIONS
MECHANICS
OPERATION
PRESSURE CONTROL
PUMPING
PUMPS
VELOCITY
WORKING FLUIDS