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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.

177k Toyota Camry Hybrids being recalled for brake issue

It looks like Consumer Reports might be getting part of what it wants regarding the Toyota Camry Hybrid and its braking system. Toyota is issuing what it calls a limited service campaign, rather than a full recall, covering about 177,500 of the hybrid sedans from the 2007 through 2011 model years because of an issue with the cars' brake fluid reservoirs.
The models have a filter separating two chambers of the brake fluid reservoir, and the part can get clogged over time. If this happens, the fluid level in one of the chambers can get too low and eventually cause the power assist to fail. There are multiple warning lights on the dashboard that illuminate over time if the filter gets obstructed, though. The company is replacing the entire reservoir with an improved unit, and the fix takes about two hours to perform.
Consumer Reports recently began asking for a recall on these models for the potentially clogged filters. The magazine also reported a second issue with the ABS brake actuator that could lead to a difficult to depress brake, but Toyota has increased the warranty on the part to 10 years or 150,000 miles.

Fuel cells will flop outside Japan, says VW

"It may fly within Japan, but not globally," VW's Shoji said.
It's long been battered into our beleaguered auto writer brains that the ultimate future source of motivation for tomorrow's cars and trucks is not gasoline, diesel, electricity, natural gas, propane or solar power - it's the hydrogen fuel cell. It's been the Next Big Thing since the start of Next Big Things.