Automatic control system for a multiple speed ratio power transmission system

Claim 1

IN A CONTROL SYSTEM FOR A MULTIPLE SPEED RATIO POWER TRANSMISSION MECHANISM COMPRISING A HYDROKINETIC TORQUE CONVERTER AND GEAR ELEMENTS THAT COOPERATE TO DEFINE MULTIPLE SPEED RATIOS TORQUE DELIVERY PATHS, DRIVEN PORTIONS OF SAID CONVERTER BEING CONNECTED TO POWER INPUT PORTIONS OF SAID GEAR ELEMENTS, A POWER OUTPUT SHAFT CONNECTED TO DRIVEN PORTIONS OF SAID GEAR ELEMENTS, POWER INPUT PORTIONS OF SAID CONVERTER BEING ADAPTED TO BE CONNECTED TO AN ENGINE, CLUTCH AND BRAKE MEANS FOR CONTROLLING THE RELATIVE MOTION OF SAID GEAR ELEMENTS TO ESTABLISH MULTIPLE SPEED RATIOS, FLUID PRESSURE OPERATED SERVOS FOR APPLYING AND RELEASING SAID CLUTCH AND BRAKE MEANS AUTOMATICALLY, A FLUID PRESSURE PUMP DRIVABLY CONNECTED TO SAID ENGINE, CONDUIT STRUCTURE INTERCONNECTING SAID SERVOS AND SAID PUMP, FLUID PRESSURE DISTRIBUTOR VALVE MEANS DISPOSED IN AND PARTLY DEFINING SAID CONDUIT STRUCTURE FOR CONTROLLING DISTRIBUTION OF PRESSURE TO SAID SERVOS, ONE SERVO BEING ADAPTED TO CONDITION SAID MECHANISM FOR LOW SPEED RATIO OPERATION AND ANOTHER SERVO BEING ADAPTED TO CONDITION SAID MECHANISM FOR HIGHER SPEED RASTIO OPERATION, A SERVO REGULATOR VALVE DISPOSED IN PORTIONS OF SAID CONDUIT STRUCTURE THAT EXTEND TO SAID OTHER SERVO, A SOURCE OF A PRESSURE SIGNAL THAT IS PROPORTIONAL IN MAGNITUDE TO ENGINE TORQUE, MEANS FOR DISTRIBUTING SAID SIGNAL TO SAID SERVO REGULATOR VALVE TO MODIFY THE REGULATING CHARACTERISTICS THEREOF THEREBY PRODUCING A REDUCED EFFECTIVE SERVO PRESSURE IN SAID OTHER SERVO DURING A SPEED RATIO CHANGE TO SAID HIGHER SPEED RATIO UNDER REDUCED TORQUE, AND A SERVO TRANSITION VALVE MEANS SENSITIVE TO A SPEED RATIO OF SAID TORQUE CONVERTER FOR APPLYING ANOTHER PRESSURE SIGNAL TO SAID SERVO REGULATOR VALVE THAT CAUSES THE LATTER TO ASSUME A HIGHER REGULATED EFFECTIVE PRESSURE IN SAID OTHER SERVO.