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Toyota finds 10% MPG improvement in hybrid PCU

Keeping up its from-all-angles approach to efficiency, Toyota has found yet another way to eke out up to ten percent more precious MPGs in its hybrid vehicles, this time electronically. The automaker has announced the development of new silicon carbide (SiC) power semiconductors for use in power control units, which it will begin testing on Japanese roads within the next year. The PCU using the silicon carbide compound offers less electrical resistance, which improves efficiency when passing current between the battery and electric motor. It also loses less power after shutting off, and can operate at a higher frequency. The net power loss of the new PCU is just one-tenth of the current silicone-only version (the latter accounting for 20 percent of total electrical power loss in today's hybrids). The result, so far, is a claimed five-percent improvement in fuel economy in test vehicles, with the potential of ten percent by the time the new SiC power semiconductor comes to market. Additionally, the carbide wafers allow for smaller a power module, coil and capacitor, thus allowing the entire PCU to be 80 percent smaller (see the side-by-side comparison in the accompanying photo, which you can click to enlarge). We've got a while to wait before we start to see the carbide technology to start making a real-world impact. Toyota aims to begin using the SiC units in 2020. By then, with improvements in the company's other key efficiency factors - engine technology and aerodynamics - cars like the Prius will likely see significant gains in fuel economy. Read more in the press release below. Toyota Develops 'Diamond-like' Computer Chips to Boost Hybrid Mileage May 20, 2014 Toyota City, Japan – Toyota is using one of the hardest materials in nature after diamonds to develop a semiconductor chip it hopes will improve the fuel efficiency of its hybrids, such as the Prius, by as much at 10 percent. The company and its partners announced today that they have developed a silicon carbide (SiC) power semiconductor for use in automotive power control units. Toyota plans to begin test-driving vehicles with the technology on public roads in Japan within a year. The chips, made from carbide - one of the hardest materials in nature, theoretically have superior characteristics such as one-tenth the electrical power loss and 10 times the drive frequency. Toyota said the chips would also allow it to reduce the size of current automotive power control units by 80 percent.

Toyota recalls 112,500 models for steering, transmission issues

Toyota has announced a voluntary recall of a variety of vehicles built between model years 2012 and 2015. Roughly 110,000 of the 112,500 vehicles being recalled consist of the gas and hybrid variants of the 2015 Camry and Highlander, as well as the 2014 and 2015 RAV4. The problem, this time around, is down to a circuit board that may have been damaged during manufacturing of the electric power steering system. According to Toyota, the bad circuit board can lead to a loss of power steering. Owners would still have manual steering control, although they'll have a warning lamp glaring at them from the instrument cluster the entire time. As for the remaining 2,500 vehicles, they're limited to the RAV4 EV, built between 2012 and 2014. A software issue in the electric vehicle traction motor assembly could cause the EV to shift into neutral. As with the issue affecting the Camry, Highlander and gas-powered RAV4, vehicles with this problem will produce a warning lamp in the instrument cluster, as well as a "Check EV" message. Toyota will be notifying owners of the affected vehicles via snail mail, and asking them to report in for free repairs at their local dealership. Check out the whole press release on the issue, available below. TORRANCE, Calif., March 11, 2015 – Toyota Motor Sales, U.S.A., Inc., today announced it will conduct safety recalls of approximately 2,500 Model Year 2012 – 2014 RAV4 EV vehicles; and approximately 110,000 Model Year 2015 Camry, Camry Hybrid, Highlander, Highlander Hybrid, and 2014-2015 Model Year RAV4 vehicles. In the involved RAV4 EV, components in the Electric Vehicle Traction Motor Assembly, which is part of the propulsion system, may cause the vehicle to shift to "neutral" due to a software issue. This condition will also trigger a "Check EV System" warning message on the instrument panel and turn on a malfunction indicator lamp. If the vehicle shifts to "neutral", this will result in a complete loss of drive power, which can increase the risk of a crash. Owners of the involved vehicles will receive a notification by first class mail. Toyota dealers will repair the electric vehicle traction motor assembly. In the involved Camry, Camry Hybrid, Highlander, Highlander Hybrid and RAV 4 vehicles, a circuit board for the electric power steering (EPS) may have been damaged during its manufacturing process. This can result in the loss of power steering assist; an instrument panel warning lamp will also come on.

Toyota Supra ready for its retrospective video closeup

Our friends at XCAR have taken the time to train their lenses on the iconic Toyota Supra. With Toyota finally back into the performance car game, it seems only logical to remember one of the brand's most legendary sports cars. While we're all busy ladling praise onto the Scion FR-S and Subaru BRZ twins, it's important to remember that Toyota used to produce all manner of fun-to-drive machinery. The Supra once sat at the top of that list, its most recent iteration giving buyers the option of a ludicrous forced-induction inline six, gorgeous styling and plenty of presence.
Of course, the legend didn't stop once the Supra fell off American order sheets in 1998. Always an aftermarket darling, the Supra has gone on to become a tuner favorite in nearly every corner of grassroots motorsport. From drag racing to road racing and everywhere in between, the Supra is remains a force to be reckoned with nearly 15 years after it last prowled the US auto market. You can catch the tribute from XCAR below.