Toyota Jidosha Kabushiki Kaisha

Toyota Motorsport Gmbh

Kabushiki Kaisha Toyota Chuo Kenkyusho

Shinichi Takeuchi

Akihiko Ichikawa

Jun Yabuta

Tomohiro Yoshimura

Lars Van Leeuwen

Andree Miller

Klemens Pollmeier

Isamu Shiotsu

Kotaro Hoshihara

Patrizio Agostinelli

Junichi Muraoka

Atsushi Tabata

Akira Murakami

Yoshio Fuwa

Takeo Yamamoto

Ryo Suzuki

Tomomitsu Terakawa

Ryo Yanagawa

Katsuya Kobayashi

Hitoshi Azuma

Shinichiro Watarai

Yasuyuki Hagino

Tomoyasu Kurimoto

Akiyoshi Negishi

Yuuki Masui

Takeshi Yano

Yuki Masui

Takushi Takamura

Takeshi Kaino

Hiroaki Tashiro

Yoshinori Ozaki

Masaaki Ogawa

Shingo Noritake

Mitsuo Okubo

A mapping, which is as a subject of learning, is a learning model that uses a sound signal as an input variable and outputs a variable indicating the cause of a sound in a vehicle. A learning method includes a signal correction process that corrects a sound signal by superimposing a noise signal on the sound signal, and an update process that updates the mapping through machine learning in which the sound signal corrected in the signal correction process serves as training data and a cause of a sound paired with the sound signal serves as teaching data.

Method for learning mapping

A control apparatus for a vehicular transmission including at least one dog clutch each having a first dog member mounted on a first shaft such that the first dog member is rotated together with the first shaft, and at least one second dog member each mounted to be axially adjacent to the first dog member and rotatable relative to the first shaft, first gears each mounted to be rotatable relative to the first shaft and provided with the second dog member, second gear which are mounted such that the second gears are rotated together with a second shaft parallel to the first shaft, and which mesh with the respective first gears, and a shifting mechanism for selectively placing each dog clutch in an engaged or released state. The control apparatus includes: a first calculating portion for detecting to a rotary angular position of the first shaft, and calculating a rotary angular position of the first dog member on the basis of the detected rotary angular position of the first shaft; a second calculating portion for detecting a rotary angular position of the second shaft, and calculating a rotary angular position of each second dog member on the basis of the detected rotary angular position of the second shaft; and an engagement control portion for controlling the shifting mechanism on the basis of the rotary angular positions of the first and second dog members, for engagement of the first and second dog members with each other.

Control apparatus for vehicular transmission

A dog clutch includes a gear () mounted on a power transmission shaft (), first and second dog rings (), a fork (), springs (), and cam grooves (). The cam grooves () each include a first slope surface () inclined from the axial direction toward the positive rotation direction as the first slope surface () approaches the gear () and a second parallel surface () parallel to the axial direction. The first dog ring () includes first cam protrusions () to be engaged with the respective first slope surfaces (), and the second dog ring () includes second cam protrusions () to be engaged with the respective second parallel surfaces (). This structure prevents the dog rings and the fork from coming into contact with each other, thereby avoiding generation of abrasion and increasing the transmission efficiency.

Dog clutch and transmission

A vehicle transmission has a plurality of gear positions that are to be selectively established, and includes: an input shaft; a first shaft; a second shaft; an output shaft; at least one first drive gear disposed on the first shaft; at least one second drive gear disposed on the second shaft; at least one driven gear disposed on the output shaft; a dog clutch connecting and disconnecting between the input shaft and each of the first and second shafts; and a synchronous meshing apparatus. The synchronous meshing apparatus connects and disconnects between each of the first and second shafts and the output shaft, and, when connecting between each of the first and second shafts and the output shaft, establishes a power transmission path from each of the first and second shafts to the output shaft via a selected one of the at least one first or second drive gear.

Vehicle transmission

A first dog ring and a second dog ring are biased toward each other by means of springs. When the first dog ring and the second dog ring are moved away from each other, bias force produced by the springs is applied to the second dog ring in a direction to draw the second dog ring toward the first dog ring. Accordingly, when the first dog ring is moved away from the second dog ring during shifting, the second dog ring is drawn toward the first dog ring under the bias force, and third engaging teeth of the second dog ring and meshing teeth of a first-speed gear are promptly disengaged from each other.

Transmission for vehicle

A control apparatus for a vehicle transmission that includes: transmission gears disposed on a shaft; a switching mechanism which is to be switched between a connecting state in which one of the transmission gears is rotatable integrally with the shaft and a disconnecting state in which the one of the transmission gears is rotatable relative to the shaft; a shift fork for axially moving the switching mechanism; and a shift barrel to be rotated to position the shift fork. The switching mechanism includes first and second rings and an elastic member which is disposed between the first and second rings in the axial direction and connects the first and second rings. The control apparatus determines that a failure occurs in the vehicle transmission, when a value related to a reaction force that acts on the shift barrel during rotation of the shift barrel is deviated from a predetermined range.

Control apparatus for vehicle transmission

A dog clutch includes a rotating member including first dog teeth, an annular dog ring including second dog teeth, and an annular dog sleeve. The rotating member includes first protrusions protruding radially outwardly from the outer circumferences of crests or troughs of the first dog teeth, the dog sleeve includes second protrusions that are configured to come into contact with the first protrusions in a circumferential direction when the dog sleeve moves toward the rotating member in an axial direction, and the first dog teeth and the second dog teeth are disposed at positions at which the first dog teeth and the second dog teeth are able to be engaged with each other in the circumferential direction in a state in which the first protrusions and the second protrusions are in contact with each other.

Dog clutch

A transmission includes a gear shift set including a shift gear and a switching mechanism, and another gear shift set including a shift gear and a switching mechanism. At a side face of the lower shift gear, dogs are provided to protrude. The switching mechanism includes a first ring configured to rotate integrally with a shaft, a second ring configured to rotate integrally with the first ring, and an elastic member connecting the first ring and the second ring. The first ring includes first projection portions, and a first abutment portion allowing a shift member to abut thereon. The second ring includes second projection portions, and a second abutment portion allowing the shift member to abut thereon.

Transmission

A vehicle engine control device stopping fuel injection if a predetermined fuel cut condition is satisfied, is provided, during running with the fuel injection stopped, when inertia of a power transmission system rotating with the engine has a smaller rate of inertia of the power transmission system acting on rotation of an output shaft of the engine, the fuel injection being started at a lower engine rotation speed as compared to the case of a larger rate of inertia of the power transmission system acting on rotation of the output shaft of the engine, a clutch capable of connecting and interrupting power transmission between the engine and the power transmission system being interposed between the engine and the power transmission system, a rate of inertia of the power transmission system acting on rotation of the output shaft of the engine being configured to decrease as a clutch stroke of the clutch that is an operation amount of a clutch pedal increases, and an engine rotation speed for starting the fuel injection being set to a lower value as the clutch stroke increases.

Vehicle engine control device

This apparatus is provided with a clutch mechanism. The clutch mechanismis interposed between an engineand a transmission, and is coupled to a clutch pedal. An operating mode of the clutch mechanismchanges in conjunction with a change of an operating position of the clutch pedal. In the case that an execution condition is met, the apparatus lowers a maximum operating speed of the clutch mechanismin comparison with a state in which an execution condition is not met. The execution condition includes the following execution start condition that 'the operating position of the clutch pedalis a position setting the clutch mechanismto a disengaged state, and a changing speed of the operating position of the clutch pedalin an engaging direction at a time of setting the clutch mechanismto an engaged state from the disengaged state is equal to or higher than a predetermined starting speed'.

Control apparatus of clutch mechanism

A propeller shaft having high wear resistance is provided. The propeller shaft has a spline shaft and a spline sleeve meshing with each other, and a DLC coating is applied to any one of the spline shaft and the spline sleeve. The DLC coating has surface roughness Ra of 0.5 &#x3bc;m or smaller.

Propeller shaft

Growing community of inventors

Nisshin, Japan

Shinichi Takeuchi