Nissan Motor Company Limited

Munemitsu Watanabe

Tomoyuki Koike

Masahiko Tahara

Akifumi Koishi

Atsushi Tezuka

Terumasa Tsuchiya

Hiromoto Shimizu

Yuuichi Hosaka

A sub-battery () having an internal resistance lower than that of a main battery () is connected to a power supply circuit () connected to the main battery (). In this case, the sub-battery () is connected to the power supply circuit () after the voltage Eof the power supply circuit () is adjusted to the voltage Eof the sub-battery () by controlling the power generation voltage Eof an alternator () connected to the power supply circuit ().

Vehicle power supply control method and vehicle power supply control device

A power supply system that is mountable on a vehicle includes a lithium-ion storage battery connected to an electrical load via two paths being a first path and a second path, a power generator capable of charging the lithium-ion storage battery, a first switch provided on the first path, an electrical resistance element provided on the second path, and a controller configured to control on/off of the power generator and perform on/off control of the first switch. According to a voltage increase request from the electrical load, the controller is configured to turn of the first switch such that a power supply to the lithium-ion storage battery through the first path from the power generator is cut.

Power supply system and method for controlling same

A power supply system that is mountable on a vehicle has a lead-acid storage battery connected to an electrical load, a lithium-ion storage battery having different charge and discharge characteristics form the lead-acid storage battery, and connected in parallel with the lead-acid storage battery with respect to the electrical load, a power generator configured to charge the lead-acid storage battery and the lithium-ion storage battery, and a controller configured to drive the power generator based on a relationship between a discharge current of the lead-acid storage battery and a discharge current of the lithium-ion storage battery.

A vehicle power supply control method includes switching, when a constant voltage is required of a power supply circuit in generating electric power by a power generator, the power supply circuit being connected to a primary storage battery and configured to be connected to a secondary storage battery that has a lower internal resistance than that of the primary storage battery, between connection of the secondary storage battery to the power supply circuit and disconnection of the secondary storage battery from the power supply circuit depending on the required constant voltage, current output to the power supply circuit by the power generator, and a state of charge of the secondary storage battery.

A vehicle traveling control method includes detecting a remaining fuel amount in a fuel tank including a fuel chamber in which a suction port of a fuel pump is disposed for sucking fuel to be supplied to an engine, the fuel tank being configured to generate negative pressure for sucking fuel to the fuel chamber by ejecting a part of fuel sucked by the fuel pump into the fuel chamber via a fuel line, permitting, when a predetermined condition is satisfied, inertial traveling during which a vehicle travels, with the engine kept stopped, operating, when the detected remaining fuel amount is less than a first threshold, the fuel pump despite the engine stopped owing to the inertial traveling, and prohibiting stop of the engine when the detected remaining fuel amount is less than a second threshold smaller than the first threshold.

Vehicle traveling control method and vehicle traveling control device

A power supply system control device for controlling a power supply system including an electric generator, a first electricity storage configured to be charged with and to discharge electric power generated by the electric generator, a second electricity storage configured to be charged with and to discharge the generated electric power, two paths connecting between the first electricity storage and the second electricity storage, a switching unit including a first switch configured to switch between a conductive state and a non-conductive state of one of the paths, and a second switch configured to switch between a conductive state and a non-conductive state of the other of the paths, and an electric load of a vehicle that is connected to the first electricity storage side of the switching unit.

Power supply system control device and power supply system control method

A power supply system in a vehicle having an idling stop function for executing an automatic stop and an automatic restart on an engine has a power generator, a first storage unit that can be charged with and can discharge generated power generated by the power generator, a second storage unit that can be charged with and can discharge the generated power, two paths connecting the first storage unit and the second storage unit, a switching unit including a first switch for switching one path of the two paths between a conductive condition and a non-conductive condition, and a second switch for switching another path of the two paths between a conductive condition and a non-conductive condition, and an engine restarter connected to either the first storage unit side or the second storage unit side of the switching unit in order to start the engine during the automatic restart.

Power supply system

An engine start control system includes a manual transmission, an upper switch, a lower switch, and an engine start control unit. The upper switch detects a pedal depression start operation by detecting a resting foot state from a foot released state. The lower switch detects a pedal depression terminating operation when the clutch pedal is depressed to an end position. The engine start control unit is configured to start the engine from a stopped state when signals of the upper switch indicates the pedal depression start operation and of the lower switch indicates the pedal depression terminating operation, and the engine start control unit being configured to prohibit starting of the engine, when the signal of the upper switch indicates switching from the foot released state to the pedal depression start operation, in response to detection of the signal of the lower switch indicating the pedal depression terminating operation.

Growing community of inventors

Kanagawa, Japan

Munemitsu Watanabe