Yanmar Co., Ltd.

Tetsuo Sakaki

Kazuhiro Yamada

Takashi Miyamoto

Takao Kawabe

Isamu Kawashima

Terumitsu Takahata

Kouji Shimizu

Toshiro Itatsu

Satomi Ukai

Reiko Nakagawa

Provided is an engine capable of performing post-injection control with a proper fuel injection amount. The engine () comprises an engine body () equipped with a turbocharger (), an engine rotational speed sensor (), an acceleration opening degree sensor (), a boost sensor (), a turbo sensor (), and an ECU () for performing post-injection control. The ECU () recognizes the rotational speed of the engine, the supercharging pressure, the load on the engine, and the rotational speed of the supercharger, and so performs the post-injection control that the rotational speed of the supercharger becomes equal to the target rotational speed of the supercharger calculated in the ECU ().

Turbocharged engine with post fuel injection control

An engine in which a fluctuation in the amount of fuel injection is reduced in the entire operating tolerance of the engine. The engine () has an engine body () provided with a turbocharger (), an engine speed sensor (), a turbo sensor (), a boost sensor (), and an ECU () for correcting the amount of fuel injection. A control means recognizes an engine speed, a supercharging pressure, a supercharger speed, a fuel injection amount and corrects the fuel injection amount.

Engine

It is an object to provide an engine that makes it possible to constantly detect the number of rotations of a supercharger with a calculation load of an ECU reduced. An engineis provided with an engine basecomprised of a plurality of cylinders and a turbocharger, a crank angle sensor, a turbo sensorthat detects rotations of the turbochargeras pulses, an amplifierthat divides the pulses by an arbitrary division ratio and calculates the divided pulses, and an ECUthat judges a surge condition of the turbocharger, wherein the ECUsets a predetermined position of a piston of each cylinder in a crank angle of the engine baseto count start timing of the divided pulses, outputs the divided pulses counted from the count start timing to the number of predetermined rotations as a first output, and judges that, if a difference between the first outputs at every cylinder is more than a predetermined value, the turbochargeris in the surge condition.

In an engine equipped with a supercharger consisting of a compressor having a plurality of blades on a turbine shaft and a turbine, at least one index means provided on the turbine shaft or the plurality of blades, and a turbo angular velocity sensor, which detects a rotation of the index means and a rotation of the plurality of blades respectively and connected to an ECU. In the engine, also, a turbo angular velocity computing means, which calculates an angular velocity by obtaining a plurality of pulses per one rotation of the turbine shaft, is provided.

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Kawasaki, Japan

Tetsuo Sakaki