Automatic transmission control system

Claim 1

IN A POWER TRANSMITTING MECHANISM FOR TRANSFERRING POWER FROM A THROTTLE CONTROLLED INTERNAL COMBUSTION ENGINE TO A DRIVEN MEMBER; A CONTROL VALVE CIRCUIT INCLUDING AN ENGINE DRIVEN PUMP AND FLUID PRESSURE OPERATED SERVOS, CONDUIT STRUCTURE INTERCONNECTING SAID PUMP AND SAID SERVOS, A PRESSURE REGULATOR VALVE MECHANISM FORMING A PORTION OF SAID CONDUIT STRUCTURE AND ADAPTED TO ESTABLISH A UNIFORM CONTROL PRESSURE LEVEL IN SAID CIRCUIT, A COMPENSATOR VALVE MEANS FOR ESTABLISHING A MODULATED CONTROL PRESSURE IN SAID CIRCUIT, SAID PRESSURE REGULATOR VALVE MECHANISM INCLUDING A PORTION SUBJECTED TO THE FORCE OF SAID MODULATED CONTROL PRESSURE WHEREBY THE CONTROL PRESSURE LEVEL IS DETERMINED IN PART BY THE MAGNITUDE OF SAID MODULATED CONTROL PRESSURE, A SOURCE OF SPEED GOVERNOR PRESSURE WHICH IS PROPORTIONAL IN MAGNITUDE TO THE DRIVEN SPEED OF SAID DRIVEN MEMBER INCLUDING A FLUID GOVERNOR PUMP DRIVABLY CONNECTED TO SAID DRIVEN MEMBER, A THROTTLE VALVE MEANS FOR ESTABLISHING IN SAID CONTROL CIRCUIT A THROTTLE PRESSURE WHICH IS PROPORTIONAL IN MAGNITUDE TO THE ENGINE TORQUE DEMAND, SAID COMPENSATOR VALVE MEANS BEING SUBJECTED TO SAID GOVERNOR PRESSURE AND SAID THROTTLE PRESSURE TO ESTABLISH OPPOSED VALVE ACTUATING FORCES AND SEPARATE MEANS FOR RENDERING SAID COMPENSATOR VALVE MEANS RELATIVELY INSENSITIVE TO VARIATIONS IN THE MAGNITUDE OF SAID SPEED RESPONSIVE PRESSURE AND TO SAID THROTTLE PRESSURE WITHIN PREDETERMINED OPERATING RANGES.