Isuzu Motors Limited

Toshiaki Adachi

Yorimasa Tsubota

Naoki Yanagisawa

Hirokazu Kurihara

Takuro Mita

Yoshifumi Hanamura

Noriyuki Tsukamoto

Tamotsu Anagama

Takao Kodaira

Satoshi Uehara

Takao Fujisaki

Nobuo Aoki

Takao Inoue

Provided is a piston temperature state monitoring system for an internal combustion engine and a piston temperature monitoring method for an internal combustion engine which are capable of properly managing a history of a piston temperature. When the number of times of a piston temperature suppression control is counted, if a ratio of a temperature difference which is the difference between a maximum limit temperature and a piston temperature to a margin width which is the difference between the maximum limit temperature and a control start temperature is equal to or less than a count threshold ratio set in advance or calculated, a count output system outputs a count signal.

Piston temperature state monitoring system for internal combustion engine and piston temperature monitoring method for internal combustion engine

A turbo charger system (,) for a diesel engine (,) with a simple structure, but improved in output, torque and fuel consumption rate. A high-stage turbine (,) and low-stage turbine (,) are provided in series on an exhaust gas line (,) of the engine (,). A high-stage compressor (,), which is connected to the high-stage turbine (,), and a low-stage compressor (,), which is connected to the low-stage turbine (,), are provided in series on an intake air line (,) of the engine (,). A bypass line (,) with a valve (,) is provided over the high-stage turbine (,). The bypass valve (,) is completely or substantially completely closed until the engine (,) reaches its maximum torque point (,) so as to raise a supercharging pressure. From the maximum torque point (,) to the maximum output point (,), the bypass valve (,) is gradually opened to adjust the supercharging pressure. The bypass valve is completely or substantially completely opened at the maximum output point (,) to suppress the supercharging pressure.

Turbo charging system of diesel engine

A swirl chamber is defined by an approximately spherical cavity formed in a cylinder head of an internal combustion engine with the radius of the swirl chamber being reduced in the direction the swirl flows in the swirl chamber. Therefore, the swirl is accelerated as it flows in the swirl chamber. The swirl chamber communicates with a main combustion chamber formed in a piston top via a passage formed in the cylinder head when the piston is at top dead center, and air in the main combustion chamber is forced into the swirl chamber due to the compression stroke of the piston. The passage is formed in a manner such that it has constant transverse section lengthwise and such that a part of the passage defines a tangential line of the swirl chamber. Therefore, the air forced into the swirl chamber passes through the passage with little friction loss, smoothly enters the swirl chamber and gains velocity in the swirl chamber.

Combustion chamber

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Machida, Japan

Toshiaki Adachi