Yanmar Co., Ltd.

Denso Corporation

Toyota Jidosha Kabushiki Kaisha

Terumitsu Takahata

Takeshi Takahashi

Hidenori Nomura

Takao Kawabe

Hiroko Okita

Makiko Adachi

Gou Asai

Yukihiro Shinohara

Tomoyuki Tsuda

Yuki Kobayashi

Takashi Miyamoto

Kazuki Maetani

Kazuhiro Takenaka

Kouji Shimizu

Toshiro Itatsu

Tetsuo Sakaki

Isamu Kawashima

Satomi Ukai

Takahiko Kimura

Keiji Ooshima

Hiroyuki Wada

In the engine having a plurality of wire harnesses, a groove section is formed by conductive walls configured to surround a part of the outer peripheral surface of selected one of the wire harnesses. Another one of the wire harnesses is attached to a wire harness cover fixed to the engine by a plate section extended from the groove section in such a manner that the another one of the wire harnesses is disposed adjacent to the selected one of the wire harnesses with one of the walls being interposed inbetween.

Engine equipped with wire harness cover

Engine

In order to constitute a fuel high-pressure pipe that is compact and easy to connect to injectors, one of both the end sections of a fuel high-pressure pipe is formed as a first connecting section connected to a fuel supply port of one injector, and the other one of the end sections of the fuel high-pressure pipe is formed as a second connecting section connected to a fuel discharge port of another injector. The first connecting section and the second connecting section are linearly formed parallel to each other, and head sections of the first connecting section and the second connecting section, said head sections being on the connecting side to respective injectors, are formed in the directions opposite to each other.

Fuel high-pressure pipe

Fuel injection pipe

An engine provided with a variable parallel supercharging system () comprising a first supercharger () which is driven by exhaust gas which flows in a first exhaust gas route () and which pressurizes intake air which flows in a first intake air route () and also comprising a second supercharger () which is driven by exhaust gas which flows in a second exhaust gas route () and which pressurizes intake air which flows in a second intake air route (), a supercharging pressure sensor () for detecting the pressure of the pressurized intake air, a first supercharger rotation sensor () for detecting the rotational speed of the first supercharger (), a second supercharger rotation sensor () for detecting the rotational speed of the second supercharger (), a first variable actuator () for adjusting the capacity of the first supercharger (), a second variable actuator () for adjusting the capacity of the second supercharger (), and a control device for controlling each of the variable actuators (). The control device controls the first variable actuator () based on detection signals from the supercharging pressure sensor () and the first supercharger rotation sensor () and controls the second variable actuator () based on detection signals from the supercharging pressure sensor () and the second supercharger rotation sensor ().

In order to reduce radiation heat from the turbine housing of a supercharger, the turbine housing is conventionally water-cooled or covered with a heat shielding material, but it is required to control heat loss due to excessive water cooling or high temperature on the outer surface of the heat shielding material. On the contrary, a solution by a cooling structure consisting of an inner thermal insulation portion of an air layer and an outer low temperature portion covering the inner thermal insulation portion has an inevitable problem of increasing number of components and upsizing. In a cooling structure of a supercharger () equipped with a turbine wheel () which rotates with exhaust gas from an engine () and provided, on the periphery of a turbine housing () for housing the turbine wheel (), with a cooling structure () consisting of an inner thermal insulation portion of an air layer () and an outer low temperature portion covering the inner thermal insulation portion, the outer low temperature portion is constituted by integrally forming a circulation passage () of fresh water in a turbine cover () which covers and protects the turbine housing ().

Cooling structure of supercharger

An engine () provided with a variable series supercharging system () composed of a high-pressure supercharger () and a low-pressure supercharger (), a supercharging pressure sensor () for detecting the pressure of intake air pressurized by the variable series supercharging system (), a high-pressure supercharger rotation sensor () for detecting the rotational speed of the high-pressure supercharger (), a variable actuator () for adjusting the capacity of the high-pressure supercharger (), and a control device () capable of controlling the variable actuator (). The control device () controls the variable actuator () based on detection signals from the supercharging pressure sensor () and the high-pressure supercharger rotation sensor ().

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.

A diesel engine in which a lubrication oil on the wall surface of the cylinder liner is prevented from being burned and diluted, and a smoke resulting from the local lack of air in the combustion chamber is also prevented from being generated. The diesel engine comprises a group injection hole nozzleand a piston. A stephaving a height gradually increased toward the radial outer circumference of the piston is formed over the entire circumference of the top surfaceof the piston. Furthermore, a tilted partis formed as the step surface of the step

Diesel engine

A cetane number detection device in which an angular velocity detection device () for detecting the rotation angular velocity of the crankshaft () of an engine (), and which detects a variation in the value of the amplitude of the angular velocity detected by the angular velocity detection device () as a variation in cetane number.

Cetane number detection means and engine having the cetane number detection means

In a diesel engine equipped with an injectorhaving a plurality of intersections between an axis line of the injectorand the axes of injection holesbored in the injector, an air intake valveis controlled so that it is closed at timing before a BDC (at timing when a piston comes to a bottom dead center) by an ECU, which controls the timing of closing the air intake valvebased on operating conditions of the engine.

Growing community of inventors

Osaka, Japan

Terumitsu Takahata