An electrical system for a vehicle having a chassis ground (G0) and an engine having an engine ground (G1), the system comprising a first electrical energy storage device (1), denoted EESD1, a second electrical energy storage device (2), denoted EESD2, a starter device (3) having a starter motor (30), a generator (4), a first cable (61) coupling a positive terminal (1+) of EESD1 to the positive terminal (3+) of the starter device, a second cable (62) coupling the positive terminal (4+) of the generator to a positive terminal (2+) of EESD2, a third cable (63) coupling a negative terminal (1) of EESD1 to the negative terminal (3) of the starter device, a control unit (5) for controlling the charge of EESD1, a fusible link (66,7) coupling a negative terminal (1) of EESD1 to the chassis ground (G0).

An apparatus configured for controlling starting of engine may include a clutch pedal including an ignition lock switch, a starter, a status detecting unit, an electronic clutch mounted between the engine and a transmission, a clutch controller configured to control coupling and releasing of the electronic clutch, check status of the electronic clutch and generate a clutch status data, and a vehicle controller configured to enter coasting running mode based on the vehicle status data, and, during the coasting running mode, operate the starter and restart the engine based on the clutch status data provided from the clutch controller and a switch status data of the ignition lock switch when a position value of an acceleration pedal included in the vehicle status data is equal to or greater than an acceleration reference value.

A power supply apparatus configures an on-board power supply system that includes a first battery and a second battery. A first module and a first detecting unit are electrically connected to the first battery as a first electrical load. A second module and a second detecting unit are electrically connected to the second battery as a second electrical load. The first module and the second module configure an electric power steering apparatus. A starter is electrically connected to the first battery. The first battery and the second battery are electrically connected by a connection path. A resistor unit is provided on the connection path.

A starter battery with a total battery voltage exceeding a supply voltage requirement of an electrical system. An alternator provides a charging voltage that corresponds with the supply voltage requirement of the electrical system. A total battery voltage equal to the sum of cell voltages exceeds the supply voltage requirement of the electrical system. A step-down voltage regulator reduces the total battery voltage to correspond with the supply voltage requirement and a boost voltage regulator increases the charging voltage from the alternator when charging the starter battery to the total battery voltage. When detecting a degraded cell, the step-down voltage regulator continues to regulate the total battery voltage to correspond with the supply voltage requirement after the cell has degraded and the boost voltage regulator is bypassed when charging the starter battery to no longer increase the charging voltage from the alternator when charging the starter battery.

Methods and apparatus are disclosed for vehicle charge control for protection against cold crank failure. An example vehicle includes a battery and a body control module. The body control module is to obtain state of charge information of the battery, obtain temperature information, and estimate a next crank time based on the state of charge information and the temperature information.

A retrofit engine start/stop control system includes a programmable logic controller, an engine block temperature sensor to measure an external engine temperature, an ambient temperature sensor, an ignition circuit connector, a battery voltage sensor and an engine speed sensor. The programmable logic controller includes computer executable instructions to start the engine when at least one of an external engine block temperature, an ambient air temperature and a battery output voltage fall below a predefined threshold value for startup. A related method for retrofit engine start/stop idle control includes activating a programmable logic controller to control stop and start and idle control functions of an internal combustion engine; measuring an engine block temperature, ambient temperature, and battery system voltage; determining if all of the monitored values exceed corresponding predetermined threshold values for shutdown; and shutting down the engine if all of the monitored values exceed corresponding predetermined threshold values.

A control apparatus controls rotating electrical machine which is applied to a vehicle in which an engine is automatically stopped in the case where predetermined automatic stop conditions are satisfied, and, the engine is automatically restarted in the case where predetermined restarting conditions are satisfied, the rotating electrical machine receiving supply of an exciting current from a transistor-chopper type exciting circuit in which a first pair of facing arms of a bridge circuit is configured with power transistors, and a second pair of arms is configured with diodes, and the rotating electrical machine having a power generation function based on rotational force of the engine. The control apparatus executes first grounding control in which, during automatic stop of the engine, among the first pair of arms, the power transistor connected on an earth side of the rotating electrical machine is put into an ON state.

Systems, apparatuses, and methods include a stop/start module in operative communication with an engine. The stop/start module is configured to determine a target start/stop ratio for an engine based on an operating parameter, determine an actual start/stop ratio for the engine based on a determined number of times that the engine is turned off in response to a determined number of stopping events, activate an inhibiting condition in response to the actual stop ratio being greater than the target stop ratio at a beginning of a driving event, and prevent the engine from turning off during a stop event in response to determining that the inhibiting condition is active and that a stopping event has occurred.

Systems and methods for operating a vehicle that includes an engine that may be automatically stopped and started are described. In one example, thresholds for allowing or inhibiting of automatic engine stopping and starting may be adjusted in response to an automatic engine cranking time. Additionally, automatic engine stopping may be inhibited during some conditions.

A method for ascertaining a torque accuracy of a torque transmitted from a belt-driven starter-generator of an internal combustion engine to the internal combustion engine, which is similar to a learning process or a calibration of the actual torque of the starter-generator with respect to a setpoint torque, includes controlling the belt-driven starter-generator to transmit a specified test torque to the internal combustion engine during a predefined test time interval during coasting down of the internal combustion engine, determining a speed variable that is dependent on a speed of the internal combustion during the test time interval, comparing the speed variable to a reference variable, and deducing the torque accuracy from this comparison.