Nissan Motor Company Limited

Jatco Corporation

Kabushiki Kaisha Riken

Renault S.a.s.

Tomoyuki Koike

Hiroyuki Suzuki

Akifumi Koishi

Atsushi Tezuka

Masahiko Tahara

Munemitsu Watanabe

Terumasa Tsuchiya

Shusaku Katakura

Yutaka Shimizu

Yukiyoshi Inuta

Youko Yoshioka

Yusuke Ota

Yoshiaki Kato

Takashi Ogino

Yutaka Mabuchi

Tetsuya Iwasaki

Takao Ito

Takahiro Hamada

Kengo Kubo

Masaki Koga

Masaki Moronuki

Katsuhiro Tsuji

Yoshiyuki Ootake

Yasuhiro Konishi

Noriyoshi Maruyama

Hiroyuki Izumi

Takashi Matsui

An internal combustion engine () for a vehicle is equipped with a variable compression ratio mechanism () capable of changing the mechanical compression ratio. An idle stop, which is for automatically stopping the internal combustion engine () when the vehicle stops, and a sailing stop, which is for stopping the internal combustion engine () in conjunction with the release of a forward clutch () during inertial travel, are carried out. A target compression ratio during normal travel is set on the basis of the load and rotation speed of the internal combustion engine (). During an idle stop the target compression ratio is set to an idle stop restart compression ratio (&#x3b5;is). During a sailing stop the target compression ratio is set to a sailing stop restart compression ratio (&#x3b5;ss). The sailing stop restart compression ratio (&#x3b5;ss) is lower than the idle stop restart compression ratio (&#x3b5;is).

Control method and control device for internal combustion engine

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 vehicle control device includes a motor, a clutch and a control unit. The motor is configured to apply torque to a power transmission path between an engine and a drive wheel. The clutch is disposed between the engine and the drive wheel. The control unit stops fuel injection of the engine when the engine is greater than or equal to a prescribed engine rotational speed during deceleration, and restarts the fuel injection after disengaging the clutch, and then stops the power running of the motor after resuming the fuel injection of the engine. The control unit drives the motor to carry out power running such that a deceleration of the vehicle becomes less than or equal to a prescribed value when fuel injection of the engine is stopped.

Vehicle control method and vehicle control device

An oil pressure control device has a mechanical oil pump (O/P) driven by a motor/generator (MG), an electric oil pump (M/O/P) driven by a sub motor (S/M) and a line pressure regulating valve (). In a case where a state is changed from a state in which the motor/generator (MG) is stopped and the electric oil pump (M/O/P) is driven to a state in which the motor/generator (MG) is started and the electric oil pump (M/O/P) is stopped, when a total flow amount of a working fluid discharge flow amount of the mechanical oil pump (O/P) and a working fluid discharge flow amount of the electric oil pump (M/O/P) is equal to or greater than a pressure regulation limit flow amount of the pressure regulating valve (), the working fluid discharge flow amount of the electric oil pump (M/O/P) is decreased.

Oil pressure control device for vehicle and oil pressure control method

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.

An oil pressure control device for a vehicle is configured such that, when switching from an oil pressure supply by means of a mechanical oil pump driven by a motor/generator to an oil pressure supply by means of an electric oil pump driven by a sub-motor, a supply ratio of oil supplied from the mechanical oil pump and a supply ratio of oil supplied from the electric oil pump, are adjusted based on an oil pressure difference between a first oil pressure and a second oil pressure, via first and second flapper valves. When the first oil pressure becomes less than or equal to a pump drive threshold, an increase in the second oil pressure is initiated, and the first oil pressure and the second oil pressure are made to match at a predetermined equilibrium oil pressure higher than a required line pressure.

Oil pressure control device for vehicle and oil pressure control method for vehicle

A control method is performed to control first and second storage devices that are connected in parallel to an electric generator in which the second storage device has a lower internal resistance than that of the first storage device. In a case where a driver has requested automated driving during charging of the first storage device (e.g., a lead-acid battery) in a state in which a generator and the second storage device (e.g., a lithium-ion battery) are disconnected, the generator and the second storage device are electrically connected even when a charge ratio of the lead-acid battery is less than a prescribed percentage. In a case where the driver has not requested the automated driving, the generator and the second storage device are electrically connected after the charge ratio of the first storage device has reached the prescribed percentage.

Vehicle power supply system control method and vehicle power supply system

A vehicle is provided with a mechanical oil pump (O/P) that is driven by a motor/generator (MG), an electric oil pump (M/O/P) that is driven by a sub-motor (S/M) and a second clutch (CL) that transmits the drive force of the motor/generator (MG) to left and right drive wheels (LT, RT). When an accelerator pedal is depressed while a brake pedal is still depressed, an integrated controller () drives the electric oil pump (M/O/P) before the brake pedal is released, and oil pressure supplied to the second clutch (CL) is increased.

Starting control device for vehicle and starting control method

A vehicle control method is provided for the suppression of electric power supplied from a battery to other electrical equipment in the event an alternator fails during automatic driving by use of automatic driving electrical equipment. The vehicle control method includes detecting surrounding information of the vehicle in an event the alternator fails during automatic driving by use of the automatic driving electrical equipment, estimating electric power to be consumed by the automatic driving electrical equipment until the vehicle stops based on a plan for stopping the vehicle in a safe location in accordance with the surrounding information that was detected, and reducing the electric power supplied from the battery to the other electrical equipment apart from the automatic driving electrical equipment as the estimated amount of electric power increases.

Vehicle control method and vehicle control apparatus

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 hydraulic control device includes: a mechanical oil pump (O/P) that is driven by a motor/generator (M/G) and that generates a first hydraulic pressure (P1); an electric oil pump (M/O/P) that is driven by a sub-motor (S/M) and that generates a second hydraulic pressure (P2); and a controller (). When a demanded drive force from a driver is generated while in a low-vehicle-speed region which is lower than a first vehicle speed (V1) at which the output of the mechanical oil pump (O/P) becomes unstable, the controller () controls the electric oil pump (M/O/P) such that the second hydraulic pressure (P2) becomes larger than a compensative hydraulic pressure (P&#x3b1;) found by subtracting the first hydraulic pressure (P1) from a necessary hydraulic pressure (Pne) determined in accordance with the demanded drive force.

Vehicular hydraulic control device and hydraulic control method

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.

Growing community of inventors

Kanagawa, Japan

Tomoyuki Koike