A control device prevents damage due to backward rotation of a rotary engine and prevents misjudgment of backward rotation of the rotary engine. The control device for a rotary engine includes a motor mechanically connected to the shaft of the rotary engine, a controller (a motor ECU) that performs energization control of the motor to start the rotary engine by driving the motor, and a sensor (such as a motor rotation sensor). When starting the rotary engine, the controller stops energization to the motor based on an electric signal from the sensor when the shaft of the rotary engine rotates backward a predetermined angle or more, and then the shaft of the rotary engine continues to rotate backward for a predetermined time.

A driving authentication system is presented for a vehicle. The system includes: a dongle interfaced with a battery of the vehicle and an authenticator configured to receive a discharge current from the battery. The dongle operates to modulate discharge current from the battery with an input code; and the authenticator demodulate the input code from the discharge current, compares the input code to the one or more known authentication codes and, in response to the input code matching one of the one or more known authentication codes, controls power capacity of the battery.

An improved method and apparatus for powering an electric motor for starting an internal combustion engine in which the electric motor is in a 6 volt to 48 volt operating system, in which an auxiliary battery pack has a battery pack housing; at least one lithium-based rechargeable cell within the housing; associated means for receiving a radio transmitted signal; associated means for turning the rechargeable cell ON or OFF; and battery connections for connecting the auxiliary battery pack to a battery in a 6 volt to 48 volt operating system.

A system in a vehicle includes a starter motor to start an engine of the vehicle and a battery configured to power the starter motor during the start of the engine. An ultracapacitor is controllably connected in series with the battery to provide additional power to the starter motor during the start of the engine.

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.

A control unit for a hybrid drive of a vehicle is provided. The hybrid drive includes an internal combustion engine and an electric machine. The hybrid drive is designed in such a way that the electric machine is used for providing a drive torque of the vehicle and for starting the internal combustion engine. The control unit is configured to predict a start time, at which at least a part of the total power of the electric machine is available for a starting process of the internal combustion engine. Furthermore, the control unit is configured to start the internal combustion engine at the predicted start time by way of the electric machine.

A booster is mounted on a vehicle having an idle stop function. The booster boosts an input voltage supplied from a battery, and outputs the boosted input voltage to an in-vehicle device. The booster includes a booster circuit and an output voltage sensor. The booster circuit is a chopper-type, and includes a reactor having one end connected to the battery and a switching element connected between an other end of the reactor and a ground. The output voltage sensor detects an output voltage of the booster circuit.

A current detector includes: a printed circuit board; and a resistor for detecting an electric current of the electrochemical device, wherein a connector having a first terminal is mounted on the printed circuit board, and the resistor has a second terminal which is brought into contact with the first terminal.

Systems and methods for starting and restarting an engine of a vehicle are disclosed. Power systems for an engine are disclosed.

A small planing watercraft includes: a travel electrical component driven for travel of the small planing watercraft; an accessory electrical component provided separately from the travel electrical component; a battery supplying power to the travel electrical component and the accessory electrical component; a sensor detecting a physical quantity corresponding to a level of the battery; and processing circuitry determining, based on a result of detection of the sensor, whether the level of the battery is a predetermined power saving level, and controlling, when it is determined that the level of the battery is the power saving level, operation of the accessory electrical component so that power consumed by the accessory electrical component is less than that before determination.