Nissan Motor Company Limited

Renault S.a.s.

Hidehiro Fujita

Shouta Hamane

Takatsugu Katayama

Naoki Osada

Yoshitaka Matsuki

Atsushi Mitsuhori

Tadanori Yanai

Masahiko Yuuya

Takanobu Sugiyama

Takayuki Hamamoto

Masahiko Yuya

Shigeru Sakuragi

Satoru Ookuma

Hiroki Ichihara

Yuta Kanashima

Takashi Kunugi

Toru Sasaki

An upper oil pan assembly is attached to the lower portion of a cylinder block. An opening is formed on a side wall of the upper oil pan assembly. The variable compression ratio mechanism changes a top dead center position of a piston in accordance with the rotational position of a control shaft to thereby change the compression ratio. The control shaft is rotationally driven by an actuator. At least a portion of the actuator is fixed to a main bearing cap in a state in which at least a portion thereof is positioned on the outer side of an upper oil pan assembly.

Variable-compression-ratio internal combustion engine

In inline four cylinder internal combustion engine (), exhaust ports for a #cylinder and a #cylinder merge inside cylinder head () and form an opening serving as a single collective exhaust port. Exhaust manifold () has individual exhaust pipes () for #and #cylinders and collective exhaust pipe (), and the leading ends of these three exhaust pipes () are connected to catalytic converter (). Exhaust gas introduction angle (&#x3b8;) of each of individual exhaust pipes () is larger by 30-60 degrees than exhaust gas introduction angle (&#x3b8;) of collective exhaust pipe (). Consequently, flow velocity distribution and temperature distribution in a catalyst carrier become uniform.

Exhaust device for internal combustion engine

In an in-line four-cylinder internal combustion engine, exhaust ports () of cylinders #2 and #3 merge together inside a cylinder head and become open as one flat collective exhaust port (). An exhaust manifold () includes separate individual exhaust pipes () for cylinders #1 and #4 and a collective exhaust pipe () for cylinders #2 and #4. Tip ends of these three exhaust pipes are connected to a catalytic converter (). An equivalent diameter of the collective exhaust port () is larger than equivalent diameters of the exhaust ports () before merging. A short diameter of the collective exhaust port () is smaller than or equal to the equivalent diameters of the exhaust ports ().

Exhaust device for four-cylinder internal combustion engine

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

A V-type multiple cylinder air intake is being configured to improve the volumetric efficiency by utilizing the resonance effect while also eliminating the adverse influence of the resonance effect (residual resonance) when the engine is operating in regions of medium to high rotational speeds. The V-type multiple-cylinder air intake device has two collectors with one arranged on each bank of the V-type multiple-cylinder engine; a plurality of branch pipes extending from the collectors to a respective intake port of an opposite bank; and a plurality of crossover passages extending from the collectors to a respective branch pipes extending from the collector of the opposite bank.

Growing community of inventors

Kanagawa, Japan

Hidehiro Fujita