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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 gives itself room to delay FCV hydrogen car until June 2017

In a new press release issued to discuss vehicles on display at the Geneva Motor Show, Honda said something a bit curious about its upcoming hydrogen car. The release reads: "The FCV Concept previews an all-new fuel cell road car that is scheduled to go on sale in Japan in the first half of 2016, and subsequently in the USA and Europe within the following 12 months." The last official word was that Honda said the car would arrive in Japan in March 2016, with US and European roll-out some time after that. The new announcement gives the company some wiggle room to adjust that timeline, since 12 months after the first half of 2016 could, theoretically, be at late as June 30, 2017. So, we asked Honda North America's senior environment and safety specialist Angie Nucci if this means that the FCV will be delayed at all. She said she doesn't have additional details for the next-gen FCV availability, "other than March 2016 in Japan and then the US and Europe after. It's the same timing that we discussed in LA." In other words, we might be reading too much into this. But it's worth noting in case the timeline does slip (again). Related Video: Featured Gallery Honda FCV Concept: Detroit 2015 View 17 Photos News Source: HondaImage Credit: Copyright 2015 Sebastian Blanco / AOL Green Honda Hydrogen Cars delay fcv

530,000 Hondas, Acuras under expanded NHTSA investigation for steering problem

Earlier this year, the National Highway Traffic Safety Administration opened an investigation into the 2022 and 2023 Honda Civic. The agency had received 145 complaints from owners stating that the car suddenly exhibited “sticky steering” and increased steering effort. WeÂ’re now learning that the investigation is expanding to include hundreds of thousands more cars. The original probe included around 238,000 Civics, but the NHTSAÂ’s latest report, issued Friday, noted that the investigation is expanding to include more than 530,000 Hondas and Acura vehicles. The 2022 and 2023 Honda Civic, 2023 Honda CR-V, and 2023 Acura Integra are affected. A drastic increase in complaints drove the expansion, as the NHTSA said it had received 1,300 reports and was aware of at least 14 crashes related to the problem. An alarming 11 of those crashes involved a roadway departure due to loss of steering control. Two of them came after the driver allegedly overcorrected, and there are three known injuries from the crashes. NHTSAÂ’s report found that the problem happened primarily in the winter months and after the car had been driven in a straight line for an extended period to warm up the vehicle and gear. Though alarming, itÂ’s worth noting that this investigation has not yet reached the recall stage. Honda acknowledged the problem, noting that it was a manufacturing issue for the steering gear unit. The manufacturing process created conditions that could cause greater internal stress, which can wear and deform the gears inside the steering component. The NHTSA also found that the factory did not guarantee consistent lubrication throughout the gear, which could be the cause of the temporary increase in steering effort. The automaker directed its dealers to replace the electronic power steering gearbox to correct a manufacturing defect, but NHTSA will continue its process, moving to an engineering analysis. If that study finds a defect, it could request a recall. Government/Legal Acura Honda Safety