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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 CR-Z will run Pikes Peak with full-EV power

Honda is running a CR-Z at Pikes Peak this year. But as you might have guessed, this is no ordinary CR-Z. This particular racing prototype packs an experimental powertrain. Though precise technical specifications remain a closely guarded secret at this point, our source at Honda has confirmed a few key details. For starters, the CR-Z racer packs a fully electric powertrain, ditching the 1.5-liter inline-four that forms the internal-combustion component of the street-legal model's hybrid propulsion system. This contrary to circulating rumors that it could be packing the hybrid powertrain from the new NSX. Whatever the details of the electric motor (or motors) on board, they'll be driving and steering all four wheels through Honda's proprietary Super Handling All-Wheel Drive (SH-AWD) and Precision All-Wheel Steer (P-AWS) systems. The technologies ought to make the CR-Z racer pretty adept at tackling the 156 twists and turns of the world-famous Race to the Clouds. The aero package is obviously pretty aggressive as well, and the bodywork appears to have been modified to an even greater extent than the carbon-fiber prototype we drove in Japan. Driving duties will be handled by Tetsuya Yamano, a Japanese driver known in the Super GT series (where he won the GT300 title in 2004 in an NSX) and for running Civics in Gymkhana events back in the 90s. It'll be competing in the Pikes Peak Challenge Exhibition class, but the idea behind the CR-Z prototype is as much about experimentation as it is about results. The project will serve to train some of Honda's younger engineers. They won't be alone on the mountain, though, as Honda also recently announced that it would be fielding its new ARX-04b Le Mans prototype at Pikes Peak this year as well. Related Video: Featured Gallery Honda CR-Z SH-AWD P-AWS Pikes Peak News Source: Honda Green Motorsports Honda Green Culture Hatchback Electric Racing Vehicles pikes peak hill climb

Recharge Wrap-up: Tesla is for Mistresses; Yo, free Smart ED rides!

Smart used the Yo app to give free test rides to San Franciscans last week. Yo is a free app wherein users tap a username to send a notification that simply says "Yo" to the recipient. Signs at locations in the Mission and SoMa neighborhoods gave instructions to send a Yo to SmartUSA for a free ride anywhere in the city. Three of the eight Smart vehicles used for the promotion were the Smart Fortwo Electric Drive. The event allowed people to see how well suited the cars are to the city, particularly when it comes to San Francisco's parking problems. It also saved users the fare of an Uber or Lyft hire. Read more at TechCrunch. Zipcar has added the 2014 Honda Fit EV to its UC Davis fleet near Sacramento, California. The cars will go to the school's West Village, a planned zero net energy community, which plans to generate as much energy as it uses within a year. "Innovations like solar power to help generate the electricity needed to charge the EV," says Dan Sperling, founding director of the school's Institute of Transportation Studies, "and fully zero emission car sharing moves us aggressively toward a sustainable future." The addition of the Fit EVs will also give cash-strapped students access to affordable emissions-free driving. Read more in the press release, below. California is one step closer to adding 15,000 new green HOV stickers after a bill was approved by the state Senate. Now the bill must go up before the California State Assembly for approval before it can be signed by Governor Jerry Brown. The bill will raise the total number of the green HOV stickers for plug-in hybrids to 70,000. Raising the cap on the green decals, which allow owners use of the carpool lanes, could encourage more California drivers to buy a PHEV. Read more at Inside EVs. The Tesla Model S made a star appearance on the ABC television show Mistresses. In the episode "Choices," the character Joss receives the car as a gift from her fiance, but is not all too happy about it, seeing it as putting her in a position of dependency. "I could never in a million years afford that Tesla," Joss complains to her friend. "How am I ever supposed to get mad at him when he can hold a Tesla over my head?" The luxury EV makes an on-screen appearance in the episode complete with an interior shot of the car's touchscreen display. See a clip from the episode below or read more at Green Car Reports. This content is hosted by a third party. To view it, please update your privacy preferences.