Kubota Corporation

Koichi Funaki

Tetsuya Kosaka

Tamotsu Kuno

Tamon Tanaka

Hirozumi Kuwabara

Satoshi Inayama

Soichiro Watanabe

Yoshitaka Taira

Seishiro Kubo

Katsushi Inoue

Yasuo Fujii

Masanori Fujiwara

Kentaro Kita

Yuki Yoshita

Kazuaki Koyama

Ryota Kimura

A hybrid system which can calculate various type of more proper required torques is provided while input factors which can be used for calculating the various types of required torques are limited. A hybrid systemincludes a rotation sensorwhich detects a rotation number of an engine, at least either one of an accelerator opening-degree sensorwhich detects an accelerator opening degree and a rotation-number instruction unitwhich transmits a rotation-number signal instructing a certain rotation number to the engine, and a control unitwhich controls an operation of the engine. The control unitexecutes control of calculating a torque determining factor for determining a system required torque as the hybrid systemon the basis of at least either one of the accelerator opening degree detected by the accelerator opening-degree sensorand the rotation-number signal transmitted by the rotation-number instruction unitand control of calculating the system required torque on the basis of the rotation number detected by the rotation sensorand the calculated torque determining factor.

Hybrid system

There is provided an exhaust treatment device for a diesel engine that can prevent unnecessary alarm for ash deposition from being issued. In the exhaust treatment device, a timer measures integrated time of a state of non-regenerative operation which ranges from an end of DPF regeneration to a next time point where the differential pressure reaches a regeneration request value. A counter acquires the short interval count if the integrated time is a short interval shorter than a predetermined decision time. An alarm device issues an alarm if the consecutive short interval count reaches a predetermined plural necessary count for alarm. A short interval count having been already acquired is preferably reset to 0 if the integrated time of the state of non-regenerative operation is a long interval, not shorter than a predetermined decision time, before the short interval count reaches the predetermined necessary count for alarm.

Exhaust treatment device for diesel engine

It is an object of the present invention to provide a diesel engine in which an engine body, a DPF case and an SCR catalyst case can be placed compactly. In the diesel engine including the engine body, the DPF case and the SCR catalyst case, a DPF is accommodated in the DPF case and an SCR catalyst is accommodated in the SCR catalyst case, the DPF case and the SCR catalyst case are mounted on the engine body, the DPF case is supported by the engine body through an exhaust gas introducing pipe, and the SCR catalyst case is supported by the DPF case through an exhaust gas relay pipe.

Diesel engine

It is an object of the present invention to provide a diesel engine in which a DPF case and an SCR catalyst case can be placed compactly. The diesel engine includes an engine body, the DPF case and the SCR catalyst case, a DPF is accommodated in the DPF case, an SCR catalyst is accommodated in the SCR catalyst case, and the DPF case and the SCR catalyst case are mounted on the engine body. The SCR catalyst case is placed in a direction which extends along the DPF case. The DPF case is placed directly above a flywheel housing and right behind a cylinder head cover, and the SCR catalyst case is placed directly above the cylinder head cover.

A swirl chamber used in association with a combustion chamber for diesel engines, includes a pair of sub-nozzle holes on the opposite sides of a main nozzle hole to supply a secondary air into the swirl chamber, the sub-nozzle holes being positioned such that the secondary air ejected therethrough is fully utilized for the combustion in the swirl chamber, thereby securing the complete combustion and the reduction of environmental contaminants such as NOx and fumes.

Swirl chamber used in association with a combustion chamber for diesel engines

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Osaka, Japan

Koichi Funaki