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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 power window switches for 6.5 million vehicles [UPDATE]

UPDATE: There was one incident of someone in the US getting a burn to the hand from this issue Toyota spokesperson Cindy Knight tells Autoblog that. "We have 11 reports where part of the door trim and/or switch was burnt," she said. The company isn't aware of any crashes from the problem, though. Because of a potential short circuit in the driver's side power window switch, Toyota is recalling 6.5 million vehicles worldwide, Reuters reports. Of those, the automaker says around 2 million are in the US. The affected models here are: 2007 and 2009 Camry and Camry Hybrid 2009-2011 Corolla 2008-2011 Highlander and Highlander Hybrid 2009-2011 Matrix 2006-2011 RAV4 2009-2011 Sequoia 2009-2011 Tundra 2006-2010 Yaris 2009-2011 Scion xB 2009-2010 Scion xD According to Toyota, the switch might not have received adequate lubricant grease during manufacturing, and over time this could lead to a short circuit. In a worst-case scenario, the part might even overheat, melt and cause a fire. As a fix, dealers will inspect the component on these vehicles and apply heat-resistant grease to it, and any broken examples will have an internal circuit board replaced. Toyota already issued one recall for this problem in 2012 when it had to repair 7.5 million vehicles globally from the 2007-2009 model years, including 2.5 million in the US. These latest models had the grease applied in a different way. Related Video: Toyota Recalls Certain Vehicles for Power Window Master Switch October 21, 2015 TORRANCE, Calif., Oct. 20, 2015 – Toyota Motor Sales, U.S.A., Inc. today announced that it is conducting a safety recall of approximately 2,000,000 vehicles related to the driver's side Power Window Master Switch. The involved vehicles include certain: 2007 and 2009 Camry and Camry Hybrid 2009-2011 Corolla 2008-2011 Highlander and Highlander Hybrid 2009-2011 Matrix 2006-2011 RAV4 2009-2011 Sequoia 2009-2011 Tundra 2006-2010 Yaris 2009-2011 Scion xB 2009-2010 Scion xD The Power Window Master Switch in the involved vehicles may have been manufactured with insufficient lubricant grease. If not enough grease is applied, under certain conditions the switch may develop a short circuit that can cause the switch assembly to overheat and melt. A melting switch can produce smoke and potentially lead to a fire. Toyota previously recalled certain 2007-2009 model year vehicles for a similar condition.

2014 Toyota Prius crash test rating drops to four stars

If nothing has changed, then how come something changed? That's the question behind the recent drop from five to four stars in the crash test rating for the Toyota Prius. As you can see on the National Highway Traffic Safety Administration (NHTSA) website, the 2014 Prius gets four stars overall while the 2013 got five. The two cars are basically identical, so what gives? Toyota says it is not sure why NHTSA rated the Prius a four this time. Starting with the 2011 model year, NHTSA updated its rating system and says in a FAQ that vehicles that had four- or five-star ratings could get lower ratings "even if no changes have been made to the vehicle." Green Car Reports says that the issue is a new set of frontal barrier tests that were conducted on the 2014 Prius last month and that resulted in the first new bits of crash test data for the car in years. The 2012 and 2013 Prius models were rated based on tests done in February 2011 on a 2011 Prius. All of these are variants of the third-generation model. The next-gen Prius is expected in 2015. Jana Hartline, environmental communication manager at Toyota Motor Sales, USA, told AutoblogGreen that the company doesn't quite know what's going on with the drop in crash test scores: There have been no changes in the test standards and no changes in the car, other than minor reinforcement for small overlap crash test which we believe did not compromise integrity. We are not sure why it rated a 4 this time. We are looking at the test results and we are confident the new generation will move back to 5 stars. 2014 Prius still has a five-star rating for the side crash test and four in the rollover test. This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings.