Mazda Motor Corporation

Hidefumi Fujimoto

Mitsuo Hitomi

Keiji Araki

Ryohei Ono

Junsou Sasaki

Kenji Uchida

Noriyuki Ota

Toshio Nishikawa

Takeshi Nagasawa

Kiyotaka Sato

Hiroyuki Yamashita

Noriyuki Iwata

Masatoshi Seto

Kazuaki Narahara

Kazuo Ichikawa

Akinori Yamashita

Junso Sasaki

Tatsuya Tanaka

Takashi Ikai

Yoshio Tanita

Susumu Masuyama

Yoshitomo Takahashi

Shingo Kai

Hirokazu Nakahashi

Yusuke Nakao

Disclosed herein is a fuel injection control device for a direct injection engine including an engine body (engine) and a fuel injection control unit (engine controller). The fuel injection control unit injects a fuel in a predetermined injection mode into a combustion chamber () such that while the engine body is warm, an air-fuel mixture layer and a heat-insulating gas layer, surrounding the air-fuel mixture layer, are formed in the combustion chamber at a point in time when an air-fuel mixture ignites, and changes the injection mode of the fuel into the combustion chamber such that while the engine body is cold, the lower the temperature of the engine body is, the thinner the heat-insulating gas layer becomes.

Fuel injection control device for direct injection engine

A fuel injection valve () is configured such that the effective opening area of an injection port () increases as its lift amount increases. A fuel injection control unit (an engine control unit) injects fuel in a lift amount changing mode wherein, when fuel is injected into a combustion chamber () in the terminal period of the compression stroke, the lift amount of the fuel injection valve is set to a predetermined large lift amount in the earlier period of the injection period, and in the later period of the injection period following the earlier period of the injection period, the lift amount is set to a small lift amount smaller than the large lift amount and is in a range where the fuel injection speed increases.

Fuel injection control device for direct-injection engine

A direct injection engine includes an ignition assistance section applying energy to fuel injected into a cylinder using an injector to assist auto-ignition combustion of the fuel when the engine is within an auto-ignition combustion operation range. A start time of fuel injection is set within a period from a terminal stage of a compression stroke to a compression top dead center. The energy is applied to the fuel injected into the cylinder in a period from start of the fuel injection to an initial stage of an expansion stroke such that a time of a specific crank angle when an increase rate of in-cylinder pressure, which is a ratio of a change in the in-cylinder pressure to a change in a crank angle in motoring the engine, reaches a negative maximum value overlaps a combustion period when a combustion mass percentage of the fuel ranges from 10% to 90%.

Direct injection gasoline engine and method of controlling the direct injection gasoline engine

A supercharging apparatus for an internal combustion engine includes a screw type supercharger having an inlet opening and an outlet opening. The supercharger is adapted to compress intake air for the engine in compression chambers between the openings when an electromagnetic clutch engages the supercharger with the crankshaft of the engine. The supercharging apparatus includes an intake air bypass passage for allowing the intake air to bypass the supercharger and a bypass control valve for closing the passage. The supercharger has a communication passage for allowing the two compression chambers to intercommunicate for relieving the compression chambers of the compression pressure therein. A controller allows the communication passage to relieve the compression pressure during the disengagement of the electromagnetic clutch and causes the bypass control valve to close the intake air bypass passage in association with the relief of the compression pressure by the communication passage.

Supercharging apparatus for internal combustion engine

A mechanical supercharger is operatively connected to the engine output shaft when the engine speed is not lower than a predetermined engine speed and disconnected from the engine output shaft when the engine speed is lower than the predetermined engine speed. The engine load is detected and the predetermined engine speed is set lower as the engine load becomes lighter.

Control system for engine with mechanical supercharger

An engine is provided with a mechanical supercharger which is disposed in an intake passage of the engine and is driven by the output power of the engine. The supercharger is connected to and disconnected from the output power of the engine by a clutch. The engine has intake and exhaust valves which are opened and closed with an overlap time. A valve timing changing mechanism changes the overlap time in order to change the amount of air communicated between the intake and exhaust ports. A controller controls the valve timing changing mechanism and the clutch so that the amount of air communicated between the intake and exhaust ports is reduced and the supercharger is disconnected from the output power of the engine and does not operate when the operating condition of the engine is in a first operational range in which the amount of intake air is not more than a first preset value, the former is increased and the latter is connected with the output power of the engine so as to operate when the operating condition of the engine is in a second operational range in which the amount of intake air is not less than a second preset value which is larger than the first preset value, and the former is increased and the latter is disconnected from the output power of the engine when the operating condition of the engine is in a third operational range in which the amount of intake air is between the first and second preset values.

Supercharged engine

Growing community of inventors

Hiroshima, Japan

Hidefumi Fujimoto