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Toyota R&D shows off free piston engine linear generator for future EVs

We often hear how an electric vehicle powertrain architecture allows vehicle designers much more freedom than a traditional ICE powertrain does. With differently shaped battery modules and small electric motors, there are lots of way to put the pieces together. With today's plug-in hybrid technology, engineers still need to put a decent-sized ICE somewhere, but new technology from Toyota could free up the gas-electric vehicle designers of the future. Presented at the recent SAE World Congress in Detroit, the idea from Toyota Central R&D Labs Inc. and involves what is called a Free Piston Engine Linear Generator (FPEG). Think of it as a sort of one-cylinder, two-stroke mini-engine that can work either as a generator (thank to magnets and a linear coil) or to directly drive a vehicle. The current prototype is a 10-kW unit that Toyota say would provide enough power to get a B- or C-segment electric vehicle up to highway speeds (75 miles per hour) when paired up to offer 20 kW. Pairing the FPEGs is also important to minimize vibrations. One system tested by Toyota had a 42 percent thermal efficiency, but the engineers are working to improve the overall efficiency even further. You can watch an animated video of the piston in action here (click on "Outline") and see the SAE papers here and here. More technical details are available at Green Car Congress. News Source: Toyota Labs via Green Car CongressTip: Thanks, Joe V. Green Misc. Auto Shows Toyota Technology Emerging Technologies Electric generator

Toyota to boost its Subaru stake to more than 20%

TOKYO — Toyota Motor Corp plans to raise its stake in Subaru Corp to more than 20% from around 17% now, a deal that would also see the smaller firm invest in Japan's top automaker, two people with direct knowledge of the matter said on Friday. The deal is due to be approved at a Toyota board meeting on Friday, the people said, declining to be identified because the information has not been made public. The investment would come a month after Toyota and another smaller Japanese automaker, Suzuki, said they would take small equity stakes in each other. Such tie-ups highlight how automakers are scrambling to chase scale, manage costs and boost development. Traditional car makers, especially smaller ones like Subaru and Suzuki, are struggling to meet the fast pace of change in an industry being transformed by the rise of electric vehicles, ride hailing and autonomous driving. Toyota's investment is likely to cost more than 70 billion yen ($650 million) based on Subaru's stock market value, said the Nikkei business daily, which first reported the news. Subaru is likely to reciprocate with a stake in Toyota that would roughly equal the value of Toyota's additional investment, one of the people told Reuters. The companies have long worked together on projects such as the Toyota 86 and Subaru BRZ twins. At one time, Subaru built Toyota Camrys in its Indiana plant. Representatives for both Toyota and Subaru said the news was not something that had been announced by their companies. "The plan appears to be to ultimately make Subaru a fully owned subsidiary, to help create a 'mega Toyota.' This is the first step towards that," said Takeshi Miyao, managing director of Carnorama, a consultancy. "It's all about building scale." Subaru is particularly strong in sport-utility vehicles (SUV) and all-wheel-drive technology. The two automakers in June said they planned to jointly develop an electric sport-utility vehicle on a platform produced together, to split costs. Car markers around the world have been joining forces to slash development and manufacturing costs of new technology. Ford Motor Co and Volkswagen AG have said they will spend billions of dollars to jointly develop electric and self-driving vehicles. Toyota seems to be particularly keen to build scale now by investing in smaller, domestic automakers, rather than forging cross-border tie-ups like some of its rivals.

Toyota to buck engine downsizing trend, may go larger and turbo-free

Turbocharging isn't really Toyota's specialty, and the Japanese automaker isn't being shy about acknowledging it. Koei Saga, a senior managing officer in charge of drivetrain research and development, says that eschewing turbos and increasing displacement of engines using the Atkinson cycle can produce better power gains without sacrificing fuel economy, Automotive News reports.
Toyota is investing heavily in larger-displacement Atkinson-cycle engines in addition to turbocharged engines, but Saga doesn't think the automaker will use turbocharging across many product lines. He apparently remains unconvinced that the technology "makes the world better."
In Toyota's eyes then, Atkinson cycle engines do make the world better, and here's how. Their pistons complete four processes - intake, compression, power and exhaust - in one revolution of the crankshaft, and the power stroke is longer than the compression stroke. Traditional Otto cycle engines require two crankshaft revolutions to accomplish those same four operations and have equal-length compression and power strokes. Atkinson cycle engines are more efficient, but less power dense, though increasing displacement can offset that shortfall.