Electrical selection apparatus or systems

Claim 1

AN AUTOMATIC GEAR CONTROL SYSTEM FOR A VEHICLE HAVING A PLURALITY OF ALTERNATIVE GEAR TRAINS FOR TRANSMITTING TORQUE FROM THE VEHICLE ENGINE TO THE PROPULSION MEMBERS OF THE VEHICLE, WHICH CONTROL SYSTEM COMPRISES A PLURALITY OF ELECTRICALLY-OPERATED MEANS ASSOCIATED RESPECTIVELY WITH THE PLURALITY OF GEAR TRAINS FOR RENDERING THE GEAR TRAINS ALTERNATIVELY OPERATIVE FOR TRANSMITTING TORQUE, A PLURALITY OF POWER TRANSISTORS RESPECTIVELY CONNECTED IN SERIES WITH THE ELECTRICALLY-OPERATED MEANS, A CURRENT SOURCE FOR SUPPLYING CURRENT TO THE SERIES CIRCUITS COMPRISING SAID ELECTRICALLY-OPERATED MEANS AND SAID POWER TRANSISTORS WHEN SAID TRANSISTORS CONDUCT, A PLURALITY OF CONTROL TRANSISTORS RESPECTIVELY CONTROLLING THE SUPPLY OF BASE CURRENT TO THE SAID POWER TRANSISTORS, MEANS FOR PRODUCING A POTENTIAL INDICATIVE OF THE APPROPRIATE GEAR TRAIN TO BE ENGAGED, AND MEANS FOR RENDERING THE CONTROL TRANSISTORS CONDUCTING ONE AFTER ANOTHER IN ACCORDANCE WITH VARIATIONS IN THE SAID POTENTIAL THEREBY TO ENGAGE AUTOMATICALLY THE APPROPRIATE GEAR TRAIN.