Engine manifold pressure responsive control system for a multiple ratio power transmission mechanism

Claim 1

A CONTROL SYSTEM FOR A POWER TRANSMISSION MECHANISM ADAPTED TO DELIVER DRIVING TORQUE FROM A THROTTLE CONTROLLED INTERNAL COMBUSTION ENGINE HAVING A THROTTLE CONTROLLED AIR-FUEL MIXTURE INTAKE MANIFOLD TO A DRIVEN MEMBER, TORQUE DELIVERY GEAR ELEMENTS DEFINING PLURAL TORQUE DELIVERY PATHS BETWEEN SAID ENGINE AND SAID DRIVEN MEMBER, CLUTCH AND BRAKE MEANS FOR CONTROLLING THE RELATIVE MOTION OF SAID GEAR ELEMENTS TO ESTABLISH VARIOUS SPEED RATIOS, A FLUID PRESSURE SOURCE, FLUID PRESSURE OPERATED SERVO MEANS FOR ACTUATING SAID CLUTCH AND BRAKE MEANS, A FLUID PRESSURE SOURCE, CONDUIT STRUCTURE INCLUDING A HIGH PRESSURE REGION INTERCONNECTING SAID FLUID PRESSURE SOURCE AND SAID SERVOS AND INCLUDING DISTRIBUTOR VALVE MEANS FOR SELECTIVELY DISTRIBUTING CONTROL PRESSURE TO SAID SERVOS, PRIMARY THROTTLE VALVE MEANS COMMUNICATING WITH SAID HIGH PRESSURE REGION AND WITH SAID INTAKE MANIFOLD FOR PRODUCING A PRESSURE SIGNAL THAT IS PROPORTIONAL IN MAGNITUDE TO INTAKE MANIFOLD PRESSURE, REGULATOR VALVE MEANS COMMUNICATING WITH SAID PRESSURE SOURCE FOR MAINTAINING A PREDETERMINED OPERATING PRESSURE LEVEL IN SAID CONDUIT STRUCTURE, AN AUXILIARY PASSAGE INTERCONNECTING SAID REGULATOR VALVE MEANS AND SAID PRIMARY THROTTLE VALVE MEANS WHEREBY THE FORMER IS SENSITIVE TO CHANGES IN SAID PRESSURE SIGNAL, A SECOND THROTTLE VALVE MEANS CONNECTED MECHANICALLY TO SAID ENGINE THROTTLE AND COMMUNICATING WITH A HIGH PRESSURE REGION OF SAID ENGINE THROTTLE, PRODUCING A PRESSURE SIGNAL THAT IS PROPORTIONAL IN MAGNITUDE TO THE DEGREE OF MOVEMENT OF SAID ENGINE THROTTLE, BOOST CONTROL VALVE MEANS DISPOSED IN AND PARTLY DEFINING SAID AUXILIARY PASSAGE AND COMMUNICATING WITH THE HIGH PRESSURE REGION OF SAID CONDUIT STRUCTURE FOR MODULATING THE PRESSURE IN SAID AUXILIARY PASSAGE TO PRODUCE CHANGES IN THE OPERATING PRESSURE LEVEL MAINTAINED BY SAID REGULATOR VALVE MEANS, SAID BOOST CONTROL VALVE MEANS COMMUNICATING WITH EACH OF SAID SIGNALS AND RESPONSIVE TO CHANGES IN RELATIVE MAGNITUDES THEREOF TO PRODUCE UNRESTRICTED PRESSURE DISTRIBUTION THROUGH SAID AUXILIARY PASSAGE MEANS WHEN THE DIFFERENCE IN MAGNITUDE OF SAID SIGNALS IS LESS THAN A PREDETERMINED VALUE AND FOR PRODUCING A REGULATED PRESSURE LEVEL IN SAID AUXILIARY PASSAGE MEANS WHEN SAID DIFFERENCE IS GREATER THAN SAID PREDETERMINED VALUE.