Shift-by-wire control system

A shift-by-wire control system, comprising:

• a range switching device to switch an engagement or a disengagement of a forward engagement element and a reverse engagement element by an actuator;
• a range switching operation unit by which a driver inputs a range switching operation;
• a range switching control unit to control the actuator of the range switching device on a basis of a state of the range switching operation unit, wherein the range switching control unit executes a running prohibition control by which the forward engagement element and the reverse engagement element are all disengaged, regardless of the state of the range switching operation unit, when a voltage supplied form a power supply is equal to or less than a predetermined value;
• a self-shut relay that interrupts a power supply to the range switching device after a predetermined time period elapses since an OFF operation of an ignition switch;
• and
• a self-shut prohibition unit that prohibits the interruption of the power supply by the self-shut relay, regardless of a state of an input signal from the ignition switch, when a running speed of the vehicle is equal to or higher than a speed predetermined value.

A shift-by-wire control system, comprising:

• a range switching device to switch an engagement or a disengagement of a forward engagement element and a reverse engagement element by an actuator;
• a range switching operation unit by which a driver inputs a range switching operation;
• a range switching control unit to control the actuator of the range switching device on a basis of a state of the range switching operation unit;
• and
• an idle stop control unit to automatically stop an engine of the vehicle when the vehicle is stopped, to automatically restart the engine according to a vehicle start preparation operation, and to prohibit the automatic restart of the engine when a predetermined automatic restart prohibition condition is fulfilled,
• wherein, when the idle stop control unit prohibits the automatic restart of the engine, the range switching control unit executes a running prohibition control by which the forward engagement element and the reverse engagement element are all disengaged and allows a starter motor to be driven in a response to an engine start operation by the driver, regardless of the state of the range switching operation unit;
• a self-shut relay that interrupts a power supply to the range switching device after a predetermined time period elapses since an OFF operation of an ignition switch;
• and a self-shut prohibition unit that prohibits the interruption of the power supply by the self-shut relay, regardless of a state of an input signal from the ignition switch, when a running speed of the vehicle is equal to or higher than a speed predetermined value.