Control circuit for electric-powered vehicle

Claim 1

AN ELECTRICAL CIRCUIT COMPRISING MEANS FOR SUPPLYING A BIDIRECTIONAL CURRENT TO TWO LEADS; A UNDIRECTIONAL CURRENT APPARATUS; A PAIR OF CONTROL CONDUCTORS, A FIRST ONE OF SAID CONDUCTORS BEING CONNECTABLE TO A FIRST ONE OF SAID LEADS; POTENTIOMETER MEANS FOR CONTROLLING THE CURRENT MAGNITUDE OF EACH DIRECTIONAL SEGMENT OF SAID BIDIRECTIONAL CURRENT OVER SAID CONDUCTORS AND HAVING A FIRST TERMINAL CONNECTABLE TO A SECOND ONE OF SAID PAIR OF CONDUCTORS, A SECOND TERMINAL SERIALLY CONNECTED THROUGH SAID APPARATUS TO THE OTHER ONE OF SAID LEADS, AND A THIRD TERMINAL SERIALLY CONNECTABLE WITH SAID OTHER ONE OF SAID LEADS; A PAIR OF ELECTRORESPONSIVE DEVICES SELECTIVELY OPERABLE UNDER CONTROL OF THE CURRENTS SUPPLIED OVER SAID CONDUCTORS; AND A PAIR OF UNIDIRECTIONAL CURRENT ELEMENTS EACH CONNECTED OPPOSITELY-POLED IN CIRCUIT WITH AN INDIVIDUAL ONE OF SAID ELECTRORESPONSIVE DEVICES BETWEEN SAID PAIR OF CONDUCTORS, A SECOND UNIDIRECTIONAL CURRENT APPARATUS SERIALLY CONNECTABLE BETWEEN SAID THIRD POTENTIOMETER TERMINAL AND SAID OTHER ONE OF SAID LEADS AND BEING OPPOSITELY-POLED TO SAID UNIDIRECTIONAL CURRENT APPARATUS CONNECTED TO SAID SECOND POTENTIOMETER TERMINAL, AND SAID POTENTIOMETER MEANS BEING ACTUATABLE FOR SELECTIVELY INCREASING AND DECREASING THE MAGNITUDE OF THE OPERATING CURRENT ON SAID CONDUCTORS FOR ONE OF SAID PAIR OF DEVICES AND IN THE OPPOSITE SENSE CONCURRENTLY DECREASING AND INCREASING THE OPERATING CURRENT ON SAID CONDUCTORS FOR THE OTHER ONE OF SAID PAIR OF DEVICES.