Vehicle road speed control

Claim 1

A VEHICLE ROAD SPEED CONTROL SYSTEM COMPRISING: A SOURCE OF FLUID PRESSURE REFLECTING VEHICLE ROAD SPEED; A FLUID PRESSURE ACTUATED SERVOMOTOR SELECTIVELY CONTROLLING VEHICLE ROAD SPEED AND HAVING A POWER WALL, FIRST AND SECOND FLUID PRESSURE CHAMBERS SEPARATED BY SAID POWER WALL, MEANS URGING SAID POWER WALL TOWARD SAID FIRST CHAMBER, AND RESTRICTIVE FLUID FLOW MEANS INTERCONNECTING SAID FIRST AND SECOND CHAMBER; VALVE MEANS FLUID CONNECTED WITH SAID SECOND CHAMBER AND EXHAUST; AND VALVE CONTROL MEANS FOR SAID MEANS INCLUDING OPPOSED DIFFERENTIAL AREA FLUID PRESSURE RESPONSIVE MEANS RECEIVING PRESSURE FROM SAID SOURCE, YIELDABLE MEANS INTERMEDIATE SAID VALVE MEANS AND THE SMALLER AREA FLUID PRESSURE RESPONSIVE MEANS, AND MEANS SELECTIVELY LOCKING SAID SMALLER AREA FLUID PRESSURE RESPONSIVE MEANS AGAINST MOVEMENT WHEREBY CHANGES IN FLUID PRESSURE FROM SAID SOURCE ACT ON THE LARGER AREA FLUID PRESSURE RESPONSIVE MEANS AND SAID YIELDABLE MEANS TO CONTROL SAID VALVE MEANS BY MODULATING THE OPENING THEREOF IN ACCORDANCE WITH SAID CHANGES IN FLUID PRESSURE AND THEREBY CONTROL THE FLUID PRESSURE DIFFERENTIAL ACROSS SAID SERVOMOTOR POWER WALL TO MOVE SAID POWER WALL TO CONTROL VEHICLE ROAD SPEED.