A vehicle determines a first resistance of a starter motor and a starter cable connected thereto based at least in part on the first voltage of a power source. The vehicle determines a predicted minimum battery voltage based at least in part on the first resistance of the starter motor and the starter cable. The vehicle, in response to the predicted minimum battery voltage satisfying a threshold, enables a vehicle stop-start function, and, in response to the predicted minimum battery voltage failing to satisfy the threshold, disables the vehicle stop-start function.

An ignition control apparatus, e.g., for an internal combustion engine, includes a rotational speed calculation unit that calculates a rotational speed of an alternating current generator. A rotor of the alternating current generator is driven to rotate in synchronization with reciprocating motion of a piston of the internal combustion engine. An ignition timing determination unit determines an ignition timing of the internal combustion engine based on the rotational speed calculated by the rotational speed calculation unit. An ignition control unit supplies electric power to an ignition coil such that the internal combustion engine is ignited at the timing determined by the ignition timing determination unit.

A management device for an energy storage device, includes a processing unit that manages the energy storage device. When the management device for the energy storage device has lost power due to a voltage drop of the energy storage device, the processing unit determines whether cause of the power loss is an external short circuit between external terminals of the energy storage device or an engine start, and the processing unit executes a response operation according to the occurrence of the external short circuit in the case of the external short circuit, and does not execute the response operation in the case of the engine start.

An energy storage apparatus for supplying electric power to auxiliaries and a starter that starts an engine of an idling-stop vehicle, the energy storage apparatus including: an energy storage device; a measurement part (current sensor) that measures a physical quantity relating to a voltage drop of the energy storage device; and a management part that manages the energy storage device. The management part executes an estimation process of estimating, based on the physical quantity, a minimum voltage of the energy storage device during restart of the engine at a predetermined time point during idling-stop of the idling-stop vehicle, and a notification process of notifying a restart request for the engine to the idling-stop vehicle when the minimum voltage is less than a predetermined threshold.

An integrated starter and on-board electrical system disconnecting module for connecting to a starter battery and to an on-board electrical system by a transducer is disclosed. A method for limiting the starting current in a motor vehicle and the use of the integrated starter and on-board electrical system disconnecting module in multi-voltage on-board electrical systems, in particular during a start-stop operation of plug-in hybrid vehicles and for hybrid on-board electrical systems, are also disclosed. The transducer can be connected to a starter circuit including the starter battery from an on-board electrical system side, via a starter control device and via an on-board electrical system disconnector. The on-board electrical system can be uncoupled from the starter circuit and the starter control device and the on-board electrical system disconnector are integrated in the module.

In at least some implementations, an ignition system for a combustion engine includes analog circuit components arranged to control ignition events at an engine speed below a first threshold of engine speed and a microprocessor to control ignition events at engine speeds higher than the first threshold. Hence, ignition can be controlled at lower engine cranking speeds to facilitate starting the engine at lower engine rotational speeds.

A drive system includes an engine as a drive source, a lead storage battery that is charged using the engine as a motive power source, a starter that starts up the engine by being driven by electric power from the lead storage battery, and a battery sensor that measures an inter-terminal voltage of the lead storage battery. A control device that is applied to the drive system temporarily stops the engine when a temporary stop condition is satisfied, and starts up the engine again when a discharge amount of the lead storage battery in a period of the temporary stop is larger than a discharge upper limit amount. When an inrush voltage is equal to or lower than a restraint threshold, the discharge upper limit amount is set so as to be smaller than when the inrush voltage is higher than the restraint threshold.

A vehicle determines a first resistance of a starter motor and a starter cable connected thereto based at least in part on the first voltage of a power source. The vehicle determines a predicted minimum battery voltage based at least in part on the first resistance of the starter motor and the starter cable. The vehicle, in response to the predicted minimum battery voltage satisfying a threshold, enables a vehicle stop-start function, and, in response to the predicted minimum battery voltage failing to satisfy the threshold, disables the vehicle stop-start function.

Methods and apparatus for controlling the ramp in of current to an electronic power assisted steering motor associated with an auto stop-start engine are described. A controller is to determine a moving average voltage of a vehicle battery. The controller is also to determine a voltage rate of change based on the moving average voltage. The controller is also to determine a moving average engine speed of an auto stop-start engine of the vehicle. The controller is also to ramp in current to an electronic power assisted steering motor of the vehicle based on the moving average voltage, the voltage rate of change, and the moving average engine speed.

A control device includes an engine starting unit that starts an engine on a condition that a first voltage is supplied, an engine control unit that controls an operation of the engine starting unit, and a transmission control unit that drives a transmission on a condition that a second voltage, which is higher than the first voltage, is supplied. The transmission control unit sends an engine start permission signal to the engine control unit in a case where a voltage of power supplied from a battery is the second voltage or higher, and the engine control unit permits the engine starting unit to start the engine on a condition that the engine control unit receives the engine start permission signal.