Toyota

About: Toyota is a company organization based out in Safenwil, Switzerland. It is known for research contribution in the topics: Internal combustion engine & Exhaust gas. The organization has 40032 authors who have published 55003 publications receiving 735317 citations. The organization is also known as: Toyota Motor Corporation & Toyota Jidosha KK.

Dynamic Modulation of Radiative Heat Transfer beyond the Blackbody Limit.

Abstract: Dynamic control of electromagnetic heat transfer without changing mechanical configuration opens possibilities in intelligent thermal management in nanoscale systems. We confirmed by experiment that the radiative heat transfer is dynamically modulated beyond the blackbody limit. The near-field electromagnetic heat exchange mediated by phonon–polariton is controlled by the metal–insulator transition of tungsten-doped vanadium dioxide. The functionalized heat flux is transferred over an area of 1.6 cm2 across a 370 nm gap, which is maintained by the microfabricated spacers and applied pressure. The uniformity of the gap is validated by optical interferometry, and the measured heat transfer is well modeled as the sum of the radiative and the parasitic conductive components. The presented methodology to form a nanometric gap with functional heat flux paves the way to the smart thermal management in various scenes ranging from highly integrated systems to macroscopic apparatus.

Design and analysis of a lightweight certificate revocation mechanism for VANET

Abstract: In this paper, we propose a lightweight mechanism for revoking security certificates appropriate for the limited bandwidth and hardware cost constraints of a VANET. A Certificate Authority (CA) issues certificates to trusted nodes, i.e., vehicles. If the CA looses trust in a node (e.g., due to evidence of malfunction or malicious behavior), the CA must promptly revoke the certificates of the distrusted node. To distribute revocation information quickly even during incremental deployment, we propose CAs use Certificate Revocation Lists (CRLs). The CRL should be composed in a secure manner, and it should be exchanged in a way such that the CRL is both quickly and widely distributed. Laberteaux et al. proposed a mechanism for the quick distribution of CRL updates that also covers a wide area by using car-to-car (C2C) communication. However, this revocation process, which involves both the CA and VANET nodes, must conform to the aforementioned bandwidth and hardware restrictions. In this paper, we present mechanisms that achieve the goals of reduced CRL size, a computationally efficient mechanism for determining if a certificate is on the CRL, and a lightweight mechanism for exchanging CRL updates. Additionally, we present a formal proof of the security of our mechanism for reducing the size of CRLs.

A group interaction system for interaction with other vehicles of a group

Abstract: The group interaction system comprises a plurality of vehicle navigation systems that are capable of communicating with one another, displaying the location of other vehicle navigation systems in a group, and receiving selection of certain vehicle navigation systems in the group and selection of an application for interaction among the selected vehicle navigation systems. A group of vehicle navigation systems to interact with is established. One or more of other vehicle navigation systems are selected for interaction with the vehicle navigation system. An application is also selected on the vehicle navigation system for interaction with the selected other vehicle navigation systems. In response, the vehicle navigation system runs the selected application with respect to the selected other vehicle navigation systems.

Visible-light-induced photocatalytic oxidation of carboxylic acids and aldehydes over N-doped TiO2 loaded with Fe, Cu or Pt

Abstract: The rates of photocatalytic oxidation of gaseous formic acid, acetic acid, acetaldehyde and toluene over N-doped TiO2 (TiO2−xNx) loaded with Fe, Cu or Pt were determined under visible light irradiation (>410 nm). It was found that the loading of Fe, Cu or Pt resulted in similar rates of enhancement of acetaldehyde oxidation, and that Cu and Pt gave the highest rates of acetic acid and toluene oxidation, respectively. It was also confirmed that the rate of formic acid photooxidation was enhanced by factors of 5 and 22 on loading of Fe and Pt, respectively. The extremely high rate enhancement of formic acid oxidation over Pt–TiO2−xNx was found to be due to a combined effect of photocatalysis and thermal catalysis at room temperature facilitated by nanoscale (1–2 nm) Pt. These results indicate several important points as to enhancement of the activity of TiO2−xNx modified with metallic species.

Stop and start control apparatus of internal combustion engine

Abstract: When a crank angle is controlled to stop at an optimal crank angle stop position by an engine automatic stop control, such as idling stop, or when the crank angle stop position can be estimated with high accuracy, the automatic engine restart is performed by a motor generator serving as an electric motor or an electric generator, at the next time of restarting of the engine. On the other hand, when the crank angle is not controlled to stop at the optimal crank angle stop position, when the crank angle stop position cannot be estimated with the high accuracy, or when the crank angle stop position changes after the stop control, the engine is restarted by a DC starter having an output torque larger than that of a motor generator, at the next time of restarting of the engine.