Speed control system for vehicles

Claim 1

APPARATUS FOR THE AUTOMATIC REGULATION OF THE VEHICLE SPEED OF ENGINE-DRIVEN VEHICLES, ESPECIALLY MOTOR VEHICLES, HAVING AN ENGINE PROVIDED WITH ENGINE CONTROL MEANS AND A CHANGE-SPEED TRANSMISSION PROVIDED WITH SHIFTING MEANS TO ENGAGE THE DIFFERENT SPEEDS THEREOF, COMPRISING FIRST TRANSMITTER MEANS FOR PRODUCING A FIRST CONTROL MAGNITUDE RESPRESENTATIVE OF A PRESELECTED DESIRED VEHICLE SPEED, SECOND TRANSMITTER MEANS FOR PRODUCING A SECOND CONTROL MAGNITUDE REPRESENTATIVE OF THE EXISTING VEHICLE SPEED, COMPARING MEANS FOR COMPARING WITH EACH OTHER SAID TWO VALUES AND FOR PRODUCING A CONTROL EFFECT IN RESPONSE TO ANY DEVIATION THEREBETWEEN INCLUDING MEANS FOR DETERMINING THE TENDENCY OF SAID DEVIATION AND THE MAGNITUDE THEREOF, ADJUSTING MEANS FOR SELECTIVELY ADJUSTING SAID CONTROL MEANS INCLUDING AN ADJUSTING MOTOR AND AN ADJUSTING MEMBER, FIRST CONNECTING MEANS OPERATIVELY CONNECTING SAID COMPARING MEANS WITH SAID ADJUSTING MEANS FOR RENDERING OPERATIVE SAID ADJUSTING MEANS IN DEPENDENCE ON SAID CONTROL EFFECT PRODUCED BY THE DEVIATION BETWEEN SAID VALUES IN SUCH A MANNER THAT THE DIRECTION OF ROTATION OF SAID ADJUSTING MOTOR IS DETERMINED BY THE TENDENCY OF SAID DEVIATION AND THE ADJUSTING SPEED THEREOF IS DETERMINED BY THE MAGNITUDE OF SAID DEVIATION, DRIVER-OPERATED ACTUATING MEANS, SECOND CONNECTING MEANS OPERATIVELY CONNECTING SAID ACTUATING MEANS WITH SAID ENGINE CONTROL MEANS FOR SELECTIVELY ADJUSTING SAID ENGINE CONTROL MEANS AND EFFECTIVELY PROVIDING A VARIABLE TRANSMISSION RATIO BETWEEN SAID ACTUATING MEANS AND SAID ENGINE CONTROL MEANS, THIRD CONNECTING MEANS OPERATIVELY CONNECTING SAID ACTUATING MEANS WITH SAID FIRST TRANSMITTER MEANS IN SUCH A MANNER THAT SAID DESIRED VALUE IS PRESELECTED BY THE RESPECTIVE POSITION OF SAID ACTUATING MEANS, FOURTH CONNECTING MEANS OPERATIVELY CONNECTING SAID ADJUSTING MEANS WITH SAID CONTROL MEANS IN SUCH MANNER AS TO EFFECTIVELY VARY THE TRANSMISSION RATIO PROVIDED BY SAID SECOND CONNECTING MEANS, AND FIFTH CONNECTNG MEANS OPERATIVELY CONNECTING SAID COMPARING MEANS WITH SAID SHIFTING MEANS IN SUCH A MANNER THAT SAID SHIFTING MEANS IS RENDERED EFFECTUAL TO SHIFT BACK SAID CHANGE-SPEED TRANSMSSION TO A LOWER SPEED IN DEPENDENCE ON SAID DEVIATION.