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.

A 750 Mb/s, 12 pJ/b, 6-to-10 GHz CMOS IR-UWB Transmitter With Embedded On-Chip Antenna

Abstract: This paper presents a novel impulse radio based ultra-wideband transmitter. The transmitter is designed in 0.18 mum CMOS process realizing extremely low complexity and low power. It exploits the 6-to-10 GHz band to generate short duration bi-phase modulated UWB pulses with a center frequency of 8 GHz. No additional RF filtering circuits are required since the pulse generator circuit itself has the functionality of pulse shaping. Generated pulses comply with the FCC spectral emission mask. Measured results show that the transmitter consumes 12 pJ/b to achieve a maximum pulse repetition rate of 750 Mb/s. An optional embedded on-chip antenna and a power amplifier operating in 6-10 GHz band are also designed and investigated as a future low cost solution for very short distance IR-UWB communications.

Automotive battery management systems

Abstract: Battery management system (BMS) is an integral part of an automobile. It protects the battery from damage, predicts battery life and maintains the battery in an operational condition. The BMS performs these tasks by integrating one or more of the functions, such as protecting the cell, controlling the charge, determining the state of charge (SOC), the state of health (SOH), and the remaining useful life (RUL) of the battery, cell balancing, as well as monitoring and storing historical data. In this paper, we propose a BMS that estimates three critical characteristics of the battery (SOC, SOH, and RUL) using a data-driven approach. Our estimation procedure is based on an equivalent circuit battery model consisting of resistors, capacitor, and Warburg impedance. The resistors usually characterize the self-discharge and internal resistance of the battery, the capacitor generally represents the charge stored in the battery, and the Warburg impedance represents the diffusion phenomenon. We investigate the use of support vector machines to predict the capacity fade and power fade, which characterize the SOH of a battery, as well as estimate the SOC of the battery. The circuit parameters are estimated from electrochemical impedance spectroscopy (EIS) test data using nonlinear least squares estimation techniques. Predictions of remaining useful life (RUL) of the battery are obtained by support vector regression of the power fade and capacity fade estimates.

Vehicle drive device

Abstract: This vehicle drive device makes it possible to avoid or suppress lubricating oil blowing out from a breather even when lubricating by raking up lubricating oil. A separation wall plate (26) defines, inside an accommodation chamber (12), a first reservoir (27) in which a ring gear (16) is disposed and a second reservoir (28) into which some lubricating oil returning to an oil pan flows. The separation wall plate (26) is disposed near the side surface of the ring gear (16). The separation wall plate (26) includes: a main section (30) that is disposed between the side surface of the ring gear (16) and the wall surface of the accommodation chamber (12) facing said side surface; and a bent piece (29) that is formed bent with respect to the main section (30) on an upper portion of the main section (30) so as to shield the breather against lubricating oil scattered upward from the ring gear (16) due to the centrifugal force caused by the rotation of the ring gear (16).

Hidden magnetic transitions in the thermoelectric layered cobaltite [ Ca 2 CoO 3 ] 0.62 [ CoO 2 ]

Abstract: A positive muon spin rotation and relaxation $({\ensuremath{\mu}}^{+}\mathrm{SR})$ experiment on $[{\mathrm{Ca}}_{2}{\mathrm{CoO}}_{3}{]}_{0.62}[{\mathrm{CoO}}_{2}]$ (i.e., ${\mathrm{Ca}}_{3}{\mathrm{Co}}_{4}{\mathrm{O}}_{9},$ a layered thermoelectric cobaltite) indicates the existence of two magnetic transitions at $\ensuremath{\sim}100\mathrm{K}$ and 400--600 K; the former is a transition from a paramagnetic state to an incommensurate (IC) spin-density wave (SDW) state. The anisotropic behavior of zero-field ${\ensuremath{\mu}}^{+}\mathrm{SR}$ spectra at 5 K suggests that the IC-SDW propagates in the $a\ensuremath{-}b$ plane, with oscillating moments directed along the c axis; also the IC-SDW is found to exist not in the $[{\mathrm{Ca}}_{2}{\mathrm{CoO}}_{3}]$ subsystem but in the $[{\mathrm{CoO}}_{2}]$ subsystem. In addition, it is found that the long-range IC-SDW order completes below $\ensuremath{\sim}30\mathrm{K},$ whereas the short-range order appears below 100 K. The latter transition is interpreted as a gradual change in the spin state of Co ions above 400 K. These two magnetic transitions detected by ${\ensuremath{\mu}}^{+}\mathrm{SR}$ are found to correlate closely with the transport properties of $[{\mathrm{Ca}}_{2}{\mathrm{CoO}}_{3}{]}_{0.62}[{\mathrm{CoO}}_{2}].$