The SAE MOBILUS platform will continue to be accessible and populated with high quality technical content during the coronavirus (COVID-19) pandemic. x

Your Selections

Mori, Hiroyuki
Show Only

Collections

File Formats

Content Types

Dates

Sectors

Topics

Authors

Publishers

Affiliations

Events

   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Technique of ECU Circuit Design Management for Automotive Ethernet

NIPPON SOKEN, INC.-Hiroyuki Mori, Miyuki Mizoguchi
Toyota Motor Corp.-Takashi Yasuda, Hideki Goto, Hiroki Keino, Kaoru Yoshida
Published 2017-03-28 by SAE International in United States
In recent years, the demand for high-speed/high-bandwidth communication for in-vehicle networks has been increasing. This is because the usage of high-resolution screens and high-performance rear seat entertainment (RSE) systems is expanding. Additionally, it is also due to the higher number of advanced driver assistance systems (ADAS) and the future introduction of autonomous driving systems. High-volume data such as high definition sensor images or obstacle information is necessary to realize these systems. Consequently, automotive Ethernet, which meets the requirements for high-speed/high-bandwidth communication, is attracting a lot of attention.The application of automotive Ethernet to in-vehicle networks requires that technology developments satisfy EMC performance requirements. In-vehicle EMC requirements consist of two parts: emission and immunity. The emission requirement is to restrict the electromagnetic noise emitted from vehicle. Therefore, automotive PHY transceivers that suppress emission noise have been developed and are available on the market. The immunity requirement is resistance against electromagnetic radiation from inside or outside the vehicle. It is commonly known that immunity performance decreases when the impedance characteristics of the transmission lines are unbalanced. In the…
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Novel Ringing Restraining Circuit to Increase the Number of ECUs Connectable in a Linear Passive Star of CAN

DENSO-Hiroyuki Obata, Tomohisa Kishigami
NIPPON SOKEN-Hiroyuki Mori, Youichiro Suzuki, Noboru Maeda
  • Technical Paper
  • 2012-08-0357
Published 2012-05-23 by Society of Automotive Engineers of Japan in Japan
As the number of ECUs in an automobile steadily increases, demand for increasing the number of ECUs connected to Controller Area Network (CAN) also rises significantly. However, the number of connectable ECUs in a linear passive star of CAN is restricted because of the ringing phenomenon in communication signals. In this paper, we propose a ringing restraining circuit activated on high level ringing voltages. As a result, we can expand the number of connectable ECUs in a linear passive star, which enables to construct low-cost communication networks by reducing the number of gateways.
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Challenge to the Diesel Engine Lubrication with Fuel

Toyota Central R&D Labs., Inc.-Hiroshi Moritani, Hiroharu Tokoro, Mamoru Tohyama, Hiroyuki Mori, Toshihide Ohmori
Toyota Motor Corp.-Motoichi Murakami
Published 2007-07-23 by SAE International in United States
A study of diesel fuel as a lubricant for diesel engines was conducted with the aim of dramatically reducing engine friction and eliminating the need to change the lubricating oil. A prototype single-cylinder engine modified for diesel fuel lubrication was made, and it was confirmed that firing operation is possible. Piston friction during the firing operation was reduced by modifying the shape of the cylinder liner surface to improve the retention of the lubricating oil. The study produced valid findings concerning engine lubrication, not only with diesel fuel, but also with ultra-low viscosity oil.
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Low Friction Property and its Mechanism of DLC-Si Films Under Dry Sliding Conditions

Toyota Central R&D Labs., Inc.-Hiroyuki Mori, Naoko Takahashi, Nakanishi Kazuyuki, Hideo Tachikawa, Toshihide Ohmori
Published 2007-04-16 by SAE International in United States
Diamond-like carbon (DLC) films are of significant interest for the automobile field, because they possess the potential to improve friction properties under various sliding conditions. Among the various DLC films, the authors focus on silicon-containing DLC (DLC-Si) films, which exhibit extremely low friction coefficient under dry sliding conditions in an ambient air atmosphere. The aim of this study is to examine the influence of silicon content in DLC-Si films on the friction property of the films, and to clarify the low friction mechanism of the films. The friction test was conducted under dry sliding conditions. It was found that the films have an exceedingly low friction coefficient (about 0.05) ranging in silicon content from 4 at% to 17 at%. In order to examine the low friction mechanism of the films, surface analyses were done on the wear surface of DLC-Si films slid against bearing steel. The formation of a silanol (Si-OH) layer on the films was observed by using derivatization-XPS. To confirm the friction coefficient of the Si-OH layer, the model samples made of a…
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Friction Characteristics of DLC-Si and Hard Coatings Lubricated in AWD Coupling Fluid

JTEKT Corp.-Toshiyuki Saito, Junji Ando, Naoyuki Sakai, Toshifumi Sakai, Hajime Fukami
Toyota Central R&D Labs., Inc.-Kazuyuki Nakanishi, Hiroyuki Mori, Hideo Tachikawa, Toshihide Ohmori
  • Technical Paper
  • 2006-05-0363
Published 2006-10-22 by Society of Automotive Engineers of Japan in Japan
Diamond-like Carbon (DLC) and other hard coatings are used for sliding parts and tools, because of their excellent wear resistance. Even though DLC coatings have a better wear resistance than other coatings, the application of DLC coatings is limited by their low productivity and high cost. The productivity and cost of DLC coatings can be improved by the direct-current, plasma-assisted CVD (p-CVD) method and the development of a Si-containing, diamond-like carbon (DLC-Si) coating as previously reported by the authors, making DLC more appealing.The clutch of the JTEKT AWD (All Wheel Drive) electronic control coupling ITCC (Intelligent Torque-Controlled Coupling) requires a high friction coefficient and a high wear resistance, therefore the use of a hard coating would be ideal for such a purpose. In this report, the friction and wear characteristics of a new coating of DLC-Si and hard coatings produced by CVD or PVD are investigated using a traditional ball-on-plate friction tester lubricated in AWD coupling fluid, to examine the application of these coatings to the clutch of the AWD coupling.As for the hard coatings,…
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Development of Compact, High Capacity AWD Coupling with DLC-Si Coated Electromagnetic Clutch

Toyoda Machine Works, Ltd.-Junji Ando, Toshiyuki Saito, Naoyuki Sakai, Toshifumi Sakai, Hajime Fukami
Toyota Central R&D Labs., Inc.-Kazuyuki Nakanishi, Hiroyuki Mori, Hideo Tachikawa, Toshihide Ohmori
Published 2006-04-03 by SAE International in United States
We have developed a high capacity electromagnetic clutch by means of Si-containing diamond-like carbon (DLC-Si) coating. The durability of the new clutch is enhanced up to 8 times higher than that of the conventional one. Such a superior performance is due to several tribological properties of the DLC-Si film and micro morphology on the clutch surface. In particular, the DLC-Si plays a significant role in maintaining the groove shape of the clutch and giving sufficient friction in fluid, which is required for a drivetrain device. Besides, our deposition process (using direct current plasma-assisted chemical vapor deposition) has afforded homogeneous DLC-Si-coated clutches in large quantities. These techniques have enabled us to reduce the number of clutch discs per coupling and achieve a more compact and higher capacity AWD coupling at a lower cost.
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Development of Compact, High Capacity 4WD Coupling With DLC-Si-Coated Electromagnetic Clutch

Toyota Central Research & Development Laboratories-Kazuyuki Nakanishi, Hiroyuki Mori, Hideo Tachikawa, Toshihide Ohmori
Toyota Machine Works-Junji Ando, Toshiyuki Saito, Naoyuki Sakai, Toshifumi Sakai, Hajime Fukami
  • Technical Paper
  • 2005-08-0033
Published 2005-05-18 by Society of Automotive Engineers of Japan in Japan
We have found the fact that DLC-Si (Silicon-containing Diamond-Like Carbon) has high friction in the fluid, which is required for drivetrain devices, while it has very low friction in the air. Taking advantage of synergy between the microscopic roughness on a clutch sliding surface and the material property, we developed a high capacity electromagnetic clutch with high anti-shudder durability. This electromagnetic clutch is eight (8) times as durable as conventional clutches, allowing us to reduce the number of clutch discs and consequently to achieve the more compact, higher capacity and lower cost of a 4WD coupling.
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Automotive Glazing: Issues and Trends

The Automotive Consulting Group, Inc.-Hiroyuki Mori, Larissa V. Koursova
Published 2000-10-03 by SAE International in United States
Key current issues and future trends in automotive glazing were identified through extensive interviews of global OEM and supplier engineers. Although the performance of tempered glass has significantly improved, application of laminated glass to side and rear windows is expected to increase globally. Plastic, most notably polycarbonate (PC), glazing is also under development although the material technology has not reached a level for mass application. Incorporating multiple features and functions into glazing is another important technology development area. Needs and acceptance as to new materials and technologies vary by the automaker and the geographic market.
Annotation ability available