Nissan Motor Company Limited

Naoki Osada

Takatsugu Katayama

Atsushi Mitsuhori

Shouta Hamane

Hidehiro Fujita

Yoshitaka Matsuki

Tadanori Yanai

Masahiko Yuya

Masahiko Yuuya

Makoto Shoji

Hatsuki Morinaga

Masahiro Arai

Masahiro Iriyama

Hiroshi Abe

Hiroyuki Itoyama

Takahiro Miura

Kenji Ariga

Ken Shiozawa

Hironori Ito

Masahiko Hashimoto

Motomu Kitamura

To achieve an intermediate lock state in a short period when an engine is stopped and improve the accuracy of confirmation of the intermediate lock state, an engine valve timing control apparatus includes a variable valve timing mechanism configured to vary engine valve timing, and an intermediate lock mechanism configured to restrict relative rotation positions of a first and a second rotor of the valve timing mechanism at an intermediate lock position for starting the engine. Upon detection of an engine stop request, the valve timing mechanism and the intermediate lock mechanism are driven and controlled for establishing an intermediate lock state. When a predetermined period from detection of the engine stop request has expired without detecting the intermediate lock state within the predetermined period, an engine stopping process is executed. Even after the engine stopping process has been executed, monitoring of the intermediate lock state is continued.

Engine valve timing control apparatus

An engine starting control apparatus is basically provided with a motor control section, a valve timing control section and a start control section. The motor control section is configured to operate an electric motor to crank an engine with an output of the electric motor being adjustable. The valve timing control section is configured to operate a variable valve operating mechanism when the engine is started to change at least a close timing of an intake valve of the engine from an initial timing to a start timing such that the start timing is set closer to an intake bottom dead center during a single engine start as compared to the initial timing. The start control section is configured to adjust the output of the electric motor as the close timing of the intake valve changes from the initial timing to the start timing during the single engine start.

Engine starting control apparatus

An engine starting control apparatus is basically provided with a motor control section, a valve timing control section and a start control section. The motor control section is configured to operate an electric motor to crank an engine with an output of the electric motor being adjustable. The valve timing control section is configured to operate a variable valve operating mechanism when the engine is started to change at least a close timing of an intake valve of the engine from an initial timing corresponding to a state in which the engine is stopped to a start timing for starting the engine. The start control section is configured to adjust the output of the electric motor as the close timing of the intake valve changes from the initial timing to the start timing.

In one aspect, an internal combustion engine includes a fuel injector for injecting fuel into a combustion chamber to produce an air-fuel mixture in the combustion chamber, a spark plug for igniting the air-fuel mixture to cause combustion in the combustion chamber and a controller controls the spark plug to cause combustion in the combustion chamber to apply a torque to start the engine from a stopped condition. The controller determines whether the operation of the engine will be stopped, and adjusts an operating condition of the engine if the controller determines the engine operation will be stopped.

Starting system for internal combustion engine

Embodiments are disclosed to reliably carry out engine starting without cranking. Using an internal combustion engine, when an idle stop condition is established, a third path switching valvethat is provided at the connection of the compressed air supply pathand a first blow-by path, and a blow-by control valveare 'closed'. The connection of the crankcase to the inlet pathis blocked, idling for a designated time is carried out, and finally the engine is stopped. On the other hand, when the idle stop release condition is established, an inlet valveis 'opened', and the first to third path switching valvestoare &#x201c;closed&#x201d;, thereby operating a compressorfor a designated period of time. Compressed air is thereby supplied to the combustion chamberand the crankcase via the compressed air supply path, allowing an increase in the internal cylinder pressure. Finally, the engine is started.

Internal combustion engine and control method thereof

A starting system rotates and starts an internal combustion engine by injecting fuel into a predetermined cylinder using an injector and igniting the fuel using an ignition plug, and upon starting the engine, the fuel pressure supplied to the injector is detected, and the engine is started by combustion in the predetermined cylinder only when the detected pressure is at or greater than the predetermined pressure, thereby guaranteeing the fuel pressure when combustion starting is employed, and consequently the engine can be securely started. In operation, the present starting system rotates and starts the engine by injecting the fuel into a predetermined cylinder using the injector and igniting the fuel using the ignition plug, and upon starting the engine, the fuel pressure supplied to the injector is detected, and the engine is started by combustion in the predetermined cylinder only when the detected pressure is at or greater than the predetermined pressure, thereby guaranteeing the fuel pressure when combustion starting is employed, and consequently the engine can be securely started.

Starting device for internal combustion engine

An internal combustion engine and control method therefor in which the engine is selectively started by combustion without cranking. The temperature in the combustion chamber of an engine cylinder is stabilized upon starting of the engine, thereby allowing secured staring without cranking. When predetermined idling stop conditions (or engine stop conditions) are established, the temperature in the combustion chamber is estimated based on engine operating conditions read before such establishment, and the period of maintaining a engine rotational speed in a predetermined low range before stopping the engine is calculated or estimated based on the estimated temperature in the combustion chamber. The engine is then stopped after the calculated or estimated period of maintaining the engine rotational speed in the predetermined low range.

Internal combustion engine and control method therefor

Undershoot of rotation speed is prevented by increasing an intake air amount of an engine when it decelerates. Precise control corresponding to differences of a deceleration state is realized by setting an increase amount of intake air to a different value according to the engine rotation speed and deceleration. Preferably, increasing of intake air amount starts when the engine rotation speed reaches a first predetermined value. It is terminated when the engine rotation speed reaches a second predetermined value smaller than the first predetermined value or when a predetermined time has elapsed, whichever is the sooner.

Growing community of inventors

Kanagawa, Japan

Naoki Osada