Ratio shift timing valves for use in a control system for a multiple ratio automatic power transmission mechanism

Abstract

Abstract A CONTROL VALVE SYSTEM FOR CONTROLLING RATIO SHIFTS IN A MULTIPLE RATIO POWER TRANSMISSION MECHANISM IN AN AUTOMOTIVE VEHICLE DRIVELINE HAVING FLUID PRESSURE OPERATED CLUTCH AND BRAKE SERVOS FOR CONTROLLING RATIO SHIFTS, SAID SYSTEM COMPRISING A VALVE ASSEMBLY FOR CONTROLLING THE RATE OF ENGAGEMENT OF ONE SERVO DURING A RATIO CHANGE FROM THE LOWEST SPEED RATIO TO AN INTERMEDIATE SPEED RATIO AND FOR CONTROLLING THE CLUTCH AND BRAKE ENGAGEMENT AND RELEASE PATTTERN WHEN A DOWN SHIFT FROM THE HIGH SPEED RATION TO AN INTERMEDIATE SPEED RATIO OCCURS IN RESPONSE TO INCREASED TORQUE DEMAND AT LOW VEHICLE SPEEDS, AND A SEPARATE VALVE ASSEMBLY FOR CONTROLLING CORRESPONDING TORQUE DEMAND DOWNSHIFT WHEN THE VECHICLE IS OPERATED IN A RELATIVE HIGH SPEED RANGE.

Inventors

• 👤 Stanley L Pierce
• 👤 William C Winn

Bibliographic Details