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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 issues stop sale on 6 key models over seat fabrics; recall possible? [UPDATE]

Toyota has issued a stop-sale order on six of its core models due to concerns about the flammability of certain seat fabrics. The issue rests not with the cloth and leather covers themselves, but with a piece of seat heater beneath them that fails to meet US Federal Motor Vehicle Safety Standards for flame retardancy.
There have been no reports of fires or injuries from the affected cars, which include some of Toyota's biggest volume sellers. 2013 and 2014 Camry, Camry Hybrid, Avalon and Sienna models equipped with heated seats are included in the stop-sale, as are 2014 Tundra pickups and Corolla sedans. The exact number of vehicles with the non-compliant materials are still being tabulated, according to The Detroit Free Press.
According to a Toyota spokesman, the National Highway Traffic Safety Administration has been notified, although it remains to be seen if a recall will be issued. Outside of a full recall, though, it's unclear how Toyota will deal with vehicles equipped with the flammable materials that have already found homes.

Toyota must go to trial over unintended acceleration suits

Toyota is surely readying its trial lawyers, as the Japanese giant is officially headed to court in a pair of cases relating to its unintended acceleration fiascos of 2009 and 2010.
In the first case, the United States Supreme Court has actually got involved in matters, ignoring an appeal from Toyota that attempted to use an arbitrator to settle its California lawsuits. The automaker will now go to trial to face owners of 2010 Prius models over an alleged defect with the anti-lock braking systems, which plaintiffs say made the cars more difficult to stop, according to Bloomberg.
The second trial is a bit more in depth, covering the case of Ida St. John, an 83-year-old from Georgia, that crashed her 2005 Camry in 2009. The accident is believed to have played a part in her death, although the suit, being filed by her grandson, doesn't actually place blame on Toyota for her death.