Toyota Jidosha Kabushiki Kaisha

Denso Corporation

Nippon Soken, Inc.

Kenji Kataoka

Yasushi Kusaka

Kimitoshi Tsuji

Toshiaki Asada

Shuichi Ezaki

Shinichi Mitani

Makoto Nakamura

Hiroshi Sato

Mitsuhiro Tabata

Koji Murakami

Masaki Takeyama

Toyoaki Kurita

Ken Yoshida

Shin Okumura

Shigeru Uenishi

Masahiko Shinagawa

Kenji Hontani

Reina Yamada

Hiroki Tasaki

A vehicle power supply device includes a relay controller. When a low voltage switching request is made to set a mode for supplying electric power from a switching module group to a low voltage power supply, the relay controller is configured to perform in sequence a first process of switching a first main relay and a second main relay to an open state, a second process of connecting a first switching relay to a second electrode terminal of the low voltage power supply and switching a second switching relay to a closed state, a third process of switching a precharge relay to a closed state and switching a third switching relay to a closed state, a fourth process of switching the second main relay to a closed state, and a fifth process of switching the precharge relay to an open state.

Vehicle power supply device and method for controlling vehicle power supply device

A power supply control device for a vehicle includes a plurality of electrical loadings installed in a vehicle; a feeding part configured to supply electric power to the electrical loadings; and a presumption part configured to presume an electrical power demand for operating the electrical loadings based on sign information for foreseeable operations of the electrical loadings. Electrical power supply from the feeding part to each electrical loading is adjusted based on the result of presumption by the presumption part.

Power supply control device for vehicle

The present invention is directed to a start-up control apparatus for an internal combustion engine that can further improve the start-up characteristics of an internal combustion engine. An ECU is provided that corrects a position at which the crankshaft stops or a position at which the crankshaft is predicted to stop based on a rotation state of the crankshaft immediately before stopping; switches an actuation timing of the fuel injection valve of the stopped intake-stroke cylinder, which is predicted to be in a intake stroke based on a position at which the crankshaft stops, based on the position at which the crankshaft is predicted to stop; during engine start-up, switches an ignition timing that actuates the spark plugs based on the position at which the crankshaft stops; predicts the amount of air that is drawn into a cylinder during a predetermined interval after engine start-up, based on the engine speed, the position at which the crankshaft stops, volume in a intake passage, and the number of times that the intake stroke has been carried out; and calculates the fuel injection amount for the cylinder based on the predicted amount of air.

Start-up control apparatus for an internal combustion engine

The present invention has an object of providing a technology capable of stopping and starting an internal combustion engine more preferably by restraining vibrations when the internal combustion engine stops and a scatter in crank angle when the internal combustion engine stops. For a period till an actual stop of the internal combustion engine since a stopping condition of the internal combustion engine was established, an air quantity of air flowing into a cylinder of the internal combustion engine is decreased when a number of revolutions of the engine is higher than a specified number of revolutions (S) and is increased when the number of revolutions of the engine is equal to or lower than the specified number of revolutions (S).

Control device and control method for stopping and starting an internal combustion engine

A valve-driving system which is applied to an internal combustion engine having a plurality of cylinders for driving an intake or exhaust valve provided in each cylinder, including a plurality of valve-driving apparatuses provided for driving valves of different cylinders of the internal combustion engine, wherein each valve-driving apparatus includes an electrical motor as a driving source for generating rotation motion; and a power transmission mechanism for converting the rotation motion of the electric motor into opening and closing motion of the valve to be driven and for transmitting the opening and closing motion to the valve through a cam or a link.

Valve-driving system of internal combustion engine

At a time of stopping an internal combustion engine, inertia energy of the engine is kept constant, for example, by controlling a number of engine revolution constant, while controlling combustion of the engine. By utilizing the controlled inertia energy, the engine is stopped at a predetermined crank angle position. Since the engine is stopped at the predetermined crank angle position by utilizing the controlled inertia energy, a large amount of energy for controlling the stop position of the energy is not needed, and the energy needed for the stop control can be reduced. Since the inertia energy utilized for the stop control is always controlled in a predetermined state, the engine can be stopped at a proper position reliably each time.

Control apparatus of internal combustion engine

A valve-driving system, which is applied to an internal combustion engine having a plurality of cylinders, for driving an intake or exhaust valve provided in each cylinder, comprising: a plurality of valve-driving apparatuses, each of which is provided for at least each one of the intake valve and the exhaust valve, each valve-driving apparatus having an electrical motor as a driving source for generating rotation motion and a power transmission mechanism provided with a transmitting section for transmitting the rotation motion generated by the electrical motor and a converting section for converting the rotation motion transmitted from the transmitting section into opening and closing motion of the valve to be driven; and a motor control device which controls operations of electric motors of the respective valve-driving apparatuses in accordance with the operation state of the internal combustion engine.

Valve-driving system of internal combustion engine and valve-driving apparatus

In a method of starting an internal combustion engine, a combustion energy is generated by combusting a fuel that has been injected into a cylinder in an expansion stroke when the internal combustion engine is stopped. In the aforementioned method, the combustion energy generated by combusting the fuel is obtained based on a state of an air/fuel mixture within the cylinder to which the fuel has been injected. Based on the obtained combustion energy, a kinetic energy to be supplied to the internal combustion engine from a primary energy supply source is estimated. A difference between a predetermined target kinetic energy required for starting the internal combustion engine subsequent to the start of combustion and the estimated kinetic energy to be supplied from the primary energy supply source is obtained. The kinetic energy corresponding to the obtained difference is supplied from a secondary energy supply source in the form of a starter motor.

Starting method and starting device of internal combustion engine, method and device of estimating starting energy employed for starting method and starting device

A stop position control apparatus of an internal combustion engine is applied to a vehicle having of a motor or a generator connected to a crankshaft of the engine, such as an economic-running vehicle and a hybrid vehicle. A rotation position of a motor generator is detected by a motor angle sensor, and a crank angle of the engine is detected by a crank angle sensor. A stop position of the internal combustion engine, at the time of stoppage is estimated based on the rotation position of the motor generator and the crank angle. By utilizing the results, the stop position of the internal combustion engine can be accurately estimated. By detecting a rotation direction of the crankshaft, the stop position of the engine can be accurately estimated even when the engine is rotated in the reverse direction at the time of the engine stopping.

Stop position estimating apparatus of internal combustion engine

A stop control apparatus for an internal combustion engine is provided with a valve mechanism capable of operating at least one of an intake valve and an exhaust valve independently a crankshaft of an internal combustion engine, and a valve controlling device for controlling an operation of the valve mechanism so that the internal combustion engine is stopped in a predetermined state.

Stop control apparatus for internal combustion engine

A start control apparatus for an internal combustion engine according to the present invention is characterized by that in a port injection type internal combustion engine, fuel is supplied in the interior of a cylinder that is in its compression stroke or expansion stroke upon stoppage of the internal combustion engine, and upon the next start of the internal combustion engine, the fuel in the interior of the aforementioned cylinder is burned to rotate the engine output shaft utilizing the pressure generated when the fuel is burned. Thus, the torque required for cranking the internal combustion engine is reduced and the load applied on a starter apparatus such as a starter motor is reduced.

Start control apparatus for internal combustion engine

An engine is cranked by a motor generator at a start time of the engine. An engine ECU opens an intake valve or an exhaust valve during a compression stroke using a valve control mechanism during a period from when cranking is started until when a predetermined crank angle position (detected by a crank angle sensor) is reached, thereby reducing a compression workload.

Control apparatus for an internal combustion engine and control method thereof

In a starting control system for an internal combustion engine, an output shaft is rotated in a reverse direction at a predetermined direction upon start of the internal combustion engine, and then is rotated in a normal direction so as to start a cranking operation. The system serves to combust the fuel in a cylinder in an expansion stroke when the output shaft is rotated in the reverse direction, and the resultant combustion pressure is used for performing the cranking operation. This makes it possible to reduce the load exerted to the electric motor.

Starting control system of internal combustion engine and starting control method thereof

A stop and start control apparatus of an internal combustion engine prevents fuel supplied in a specific cylinder at the time of stopping the engine from being discharged in an unburned state. When an ignition switch is turned off in a state that the unburned fuel is sealed in the combustion chamber of a specific cylinder during idling stop, the unburned fuel is combusted to prevent the unburned fuel from being discharged. The vibration occurring at that time can be suppressed by rotating the motor generator in the counter direction to the rotation direction of the crankshaft. After the unburned fuel is sealed in the combustion chamber of the specific cylinder, if it is estimated that the unburned fuel is discharged, the exhaust valve corresponding to the specific cylinder is closed at the predetermined timing, or the unburned fuel is combusted, whereby the unburned fuel is prevented from being discharged. Thus, deterioration of emission can be avoided.

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Susono, Japan

Kenji Kataoka