Hydraulic control system for vehicular automatic transmission

Patent · Tue Nov 12 04:00:00 EST 1991

OSTI ID:5881865

Lentz, C A

This patent describes a hydraulic control system for the automatic transmission of a vehicle wherein the transmission includes a plurality of torque transfer devices which can be engaged and disengaged in response to fluid pressure provided by a pump, the sequence of engagement and disengagement of the torque transfer devices being determined by a pre-programmed, on-board computer so as to provide a neutral, reverse, and a plurality of forward drive ratios, the control system interconnected between the pump and the torque transfer devices. It comprises conduits; fluid operated relay valves interconnected in a cascaded arrangement by the conduits, particular relay valves having outputs connected to effect the operational status of specific torque transfer devices; solenoid valves; each solenoid valve having an electrical control input, a fluid pressure inlet and a fluid pressure outlet; a pressure regulating valve having an electrical control input; a fluid pressure inlet and a fluid pressure outlet; a pressure regulating valve having an inlet and an outlet; the pressure regulating valve receiving line pressure from the pump at the regulating valve inlet; the regulating valve outlet connected to the fluid pressure inlets of the solenoid valves; the electrical input of each solenoid valve connected to receive a control input from the computer and the outlet of each solenoid valve connected to actuate one of the relay valves; a single, pulse width, pressure modulating valve receiving line pressure from the pump and providing a modulated output pressure; and, a control valve having first and second inlets; the first inlet of the control valve receiving modulated pressure from the modulating valve; the second inlet of the control valve receiving line pressure from the pump.

• Assignee: General Motors Corp., Detroit, MI (United States)
• Patent Number(s): A; US 5063813
• Application Number: PPN: US 7-382456
• OSTI ID: 5881865
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
330602 -- Vehicle Design Factors-- Engine-Transmission Matching
AUTOMATION
CONTROL SYSTEMS
ELECTRIC COILS
ELECTRICAL EQUIPMENT
ENGINES
EQUIPMENT
HEAT ENGINES
HYDRAULIC EQUIPMENT
INTERNAL COMBUSTION ENGINES
MACHINE PARTS
MECHANICAL TRANSMISSIONS
SOLENOIDS
TORQUE