Transmission and shift control system

Abstract

Abstract AN ENGINE DRIVEN MULTISPEED TRANSMISSION HAVING AN AUTOMATIC SHIFT CONTROL SYSTEM HAVING AN AUTOMATIC SHIFT VALVE WHICH IS SPRING BIASED TO A DOWNSHIFT POSITION, UPSHIFTED IN RESPONSE TO A PRESSURE PROPORTIONAL TO THE OUTPUT SHAFT SPEED AND FURTHER CONTROLLED BY TWO SIGNAL PRESSURES PROPORTIONAL TO TORQUE DEMAND ON THE ENGINE TO PROVIDE UPSHIFTS AT SPEED VALUES WHICH GRADUALLY INCREASE AND DOWNSHIFTS AT LOWER SPEED VALUES WHICH INCREASE MORE RAPIDLY AS THE TORQUE DEMAND INCREASES FROM LOW TO HIGH VALUES SO THE DIFFERENCE BETWEEN THE UPSHIFT SPEED AND THE DOWNSHIFT SPEED GRADUALLY DECREASES WITH INCREASING TORQUE DEMAND TO PROVIDE AN AUTOMATIC TRANSMISSION SHIFT CONTROL WHICH SHIFTS IN RESPONSE TO DECREASING CHANGES IN SPEED WITH INCREASING TORQUE DEMAND FOR OPTIMUM PERFORMANCE. MANUAL OVERCONTROLS, A THROTTLE ACTUATED DETENT MAY PROVIDE SHIFTING AT OUTPUT SPEEDS AT OR SLIGHTLY HIOGHER THAN THE MAXIMUM TORQUE DEMAND AUTOMATIC UPSHIFT SPEED AND A MANUAL RANGE SELECTOR MAY PROVIDE SHIFTING AT A HIGHER OUTPUT SPEED THAN DETENT SHIFT SPEED.

Inventors

• 👤 Robert H Schaefer

Bibliographic Details