Toyota Jidosha Kabushiki Kaisha

Hiroki Iguma

Akio Kawaguchi

Hideo Yamashita

Tomohito Ono

Kazuaki Nishio

Akira Yamashita

Manabu Tateno

Hideyuki Nishida

Shintaro Hotta

Hiroto Hashimoto

Yuya Takahashi

Yoshifumi Wakisaka

Kazuyasu Iwata

Keiju Tomoda

Hideto Wakabayashi

Daisuke Shirai

Ryota Tsuda

A rolling vibration reduction device for an internal combustion engine includes: a main inertial system configured to rotate with a crankshaft of the internal combustion engine; a driving force transmission mechanism configured to transmit a rotational driving force of the crankshaft, a direction of the rotational driving force being reversed by the driving force transmission mechanism; and a sub-inertial system configured to rotate by the rotational driving force transmitted from the driving force transmission mechanism and to reduce rolling vibration of the internal combustion engine associated with rotation of the crankshaft by rotating in an opposite direction to the crankshaft. A torsional resonance frequency in the rolling vibration reduction device is set to a value higher than an explosion primary frequency at a maximum engine speed in a preset operating region of the internal combustion engine.

Rolling vibration reduction device for internal combustion engine

An engine misfire detection device is mounted on a hybrid electric vehicle that includes an internal combustion engine and a generator. The internal combustion engine has a plurality of cylinders and a crankshaft and is dedicated to power generation. The generator is connected to the crankshaft via a torsional damper. The engine misfire detection device includes a generator rotation angle sensor and a processor. The generator rotation angle sensor detects the rotation angle of the generator rotating shaft. The processor is configured to execute a misfire detection process. The misfire detection process includes a first misfire detection process of determining that the internal combustion engine has misfired when an amplitude correlation value that correlates with the magnitude of amplitude of rotation speed of the generator rotating shaft and is detected by the generator rotation angle sensor is greater than a determination threshold value.

Engine misfire detection device for hybrid electric vehicle

A powertrain system includes an internal combustion engine, a motor generator and a control device. The motor generator includes a rotating shaft connected to a crankshaft of the internal combustion engine via a torsional damper. The powertrain system is configured such that the crankshaft and the above-described rotating shaft are not connected to a drive shaft of a vehicle at least at the time of engine start. The control device is configured to execute a cranking torque amplification control that controls the motor generator such that the MG torque output from the motor generator for cranking the internal combustion engine fluctuates in a resonant period of the torsional damper while making a fluctuation center of the MG torque higher than zero.

Powertrain system

A manufacturing method for a cylinder head is described. A masking member is attached to a cylinder head material, which followed by a film formation step. The masking member comprises a mask portion to mask the matching surface with the cylinder block, mask portions to mask each of the openings of intake and exhaust ports and a mask portion to mask at least one narrow region sandwiched between openings of two adjacent port holes and has the shortest distance between opening edges of the two adjacent port holes. All Mask portions are coplanar and linked directly to each other.

Manufacturing method for cylinder head

A cylinder head material of an engine is casted (Step S). Next, the cylinder head material is machined (Step S). Next, a heat shielding film is formed on a ceiling surface of the cylinder head material (Step S). Next, the film thickness of the heat shielding film is measured (Step S). Next, a rank of a piston to be combined with the ceiling surface is selected (Step S). The rank of the piston selected in Step Sis a rank according to depth of a cavity. Next, the rank of the piston selected in Step Sis stamped on the cylinder head (Step S).

Manufacturing method for engine

A manufacturing method for an engine includes: preparing, as a preparing step, a cylinder head having a surface on which a ceiling surface of a combustion chamber is formed; forming, as a film formation step, a thermal insulation film on the ceiling surface; measuring, as a measurement step, a volume of the thermal insulation film; and selecting, as a selection step, a rank for an engine valve to be used in combination with the ceiling surface so as to correspond to an amount of difference of a measured volume of the thermal insulation film from a designed value of a volume of the thermal insulation film, the rank being selected from a plurality of ranks set in correspondence with thicknesses of umbrella portions of engine valves.

A manufacturing method for a cylinder head is described. A masking member is attached to cylinder head material, which followed by a film formation step. The masking member comprises a mask portion to mask the matching surface with the cylinder block, and mask portions to mask each of the openings of the intake ports, the exhaust ports, and the CPS hole. Mask portions are linked directly to other mask portions without any steps.

A heat shield film is formed on a bottom surface of a cylinder head and a heat shield film is formed on an inner peripheral surface of a small diameter hole portion. The film is a thermal spraying film made from the same film material. Since the film is thicker than the film, the film has higher thermal capacity than the film and thus heat retaining effect of the film is higher than that of the film. Therefore, combustion gas generated in a combustion chamber is suppressed to lose its momentum around the portion. Even if the combustion gas goes off around the portion, excessive temperature decrease of the combustion gas in the portion is suppressed.

Internal combustion engine

The present invention relates to an internal combustion engine. An object of the invention is to allow an effect produced by an anodic oxide film to be exerted while suppressing a decrease in the combustion rate. A pistonincludes a cavity portionand a tapered portionthat is formed so as to surround the cavity portionon an outer side thereof. The diameter of the tapered portiondecreases progressively in the downward direction from the top face side of the piston. A squish portionis formed on an outer side of the tapered portion. An anodic oxide filmis formed on a surface (tapered face) of the tapered portionand a surface (squish face) of the squish portion. The anodic oxide filmis not formed on the surface (cavity face) of the cavity portion

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Shizuoka-ken, Japan

Hiroki Iguma