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Honda patents engine with different cylinder displacements

A basic rule of engine design states that the displacement of a cylinder is equal to the engine's total displacement divided by its cylinder count. Honda, according to a recently surfaced Japanese patent, is looking to break that rule with an engine containing cylinders of different sizes. We've done our best to translate it from patent-ese. The idea is that different-sized combustion chambers give more flexibility when any combination of cylinders are deactivated, or rested. Because the different numbers can be combined in various ways, it provides more and smaller increments than would an engine with equal-displacement cylinders. Take a 2.0-liter four-cylinder, for example. Following the golden displacement rule, each of the four cylinders has a volume of 500 cc, giving displacement increments of 500 cc when any cylinder is deactivated. But suppose instead that the four cylinders displace 300, 425, 600, and 675 cc, respectively. This would give the engine 15 available displacements instead of just four, and the spacing between each option would be far less than 500cc. As a result, those different virtual displacements would provide more adjustment between power and efficiency than a cylinder-deactivation system can on a conventional engine. Honda's patent describes cylinders with equal bore size, with the displacement from cylinder to cylinder varying based on the crank throw radius – the longer the throw, the longer the stroke and the larger the displacement of that particular combustion chamber. The patent describes how the cylinder sizes would need to be arranged to spread the load on the crankshaft and presumably limit vibration that would be introduced by the different pulse magnitudes. If we're interpreting things correctly, the largest cylinder (the one with the longest crank throw radius) sits in the middle of the bank with the smaller ones alternating on either side as they decrease in displacement. This concept is described for multi-cylinder inline and V-type engines of various sizes. The patent was filed in March of 2014 and published in January of this year. Whether or not this arrangement will reach production is of course unknown, but the advantages in terms of both efficiency and power seem promising. Related Video: News Source: Japan Patent Office via Auto Guide Green Honda Fuel Efficiency Technology patent

Honda working on mid-engine sports car?

The NSX and new Civic Type R might not be the end of Honda's performance push. Patent images obtained by Autovisie in the Netherlands show the Japanese brand's possible design for another mid-engine sports car with what looks to be a removable top. According to Autovisie, the patent was registered on May 27 and was just released. However, nothing else official is known about the vehicle at this time. We can think of several possibilities as to what this might be. Honda is reportedly already working on the design for a future NSX convertible, although these images show significant changes to the overall shape compared to the coupe, which makes this possibility dubious. The automaker is also considering a performance model to slot below its halo car in the future, but without any scale, the size is hard to judge here. The S660 coming to North America is rumored as well, and maybe these shots are a redesign. Of course, the company's designers might just be toying around and patenting the shape for something else. This design definitely has a familial resemblance with the NSX and S660, and it looks great. Let us know in Comments what you think the vehicle might be.

Mitsubishi to join alliance with Honda and Nissan, Nikkei reports

TOKYO — Japan's Mitsubishi Motors is set to join an alliance between Honda Motor and Nissan Motor, creating a tie-up between automakers with combined sales of more than 8 million vehicles, the Nikkei newspaper said on Sunday. Mitsubishi Motors, which is 34% owned by Nissan, will work with Honda and Nissan to finalize the details of their strategic partnership, Nikkei said, adding the three firms intend to standardize in-vehicle software that controls cars. Mitsubishi Motors declined to comment on the report, while a Nissan spokesperson would only say the report was not based on something either of the companies had announced. Spokespeople for Honda did not respond to a request for comment. The push comes as Nissan, Japan's third biggest automaker, has been steadily losing market share in its two largest markets, the United States and China, which together accounted for half of its global sales in the year to March. On Thursday, the company slashed its annual outlook after heavy discounting in the U.S. almost completely wiped out its first-quarter profit. Nissan and Honda said in March they were considering a strategic partnership to collaborate on producing electric vehicle components and artificial intelligence in automotive software platforms. Mitsubishi Motors is already part of a long-standing alliance with Nissan and France's Renault that the three automakers last year agreed to restructure, aiming for a downsized but more pragmatic and agile partnership. Separate collaboration between Nissan, Honda and Mitsubishi Motors could help Japan's automakers cut costs and beef up to battle tough competition in EVs, dominated by companies like China's BYD and Tesla. In China, the world's largest auto market, Japanese brands previously were strong but are now up against domestic automakers that have rapidly increased production and won over consumers with low-priced vehicles loaded with software.