2007 Mazda Speed3 2.3l on 2040-cars

Auto blog

Mazda patent shows rotary placement in complex AWD hybrid layout

If we were playing alt-powertrain Bingo, a recent Mazda patent application filed in Japan would be one or two letters from victory. What's exciting about the patent, discovered by Japanese outlet T's Media via Motor Trend, is that while it makes a case for an internal combustion engine of any configuration, one of the drawings showing a rotary engine. The wild bit is that the whole powertrain comprises the ICE, a transaxle, two tiny in-wheel electric motors turning the front wheels, a third electric motor in the driveline, a capacitor, a lithium-ion battery, and three inverters. Motor Trend parsed the mechanics, and the way it reads, Doc Brown couldn't have done a better job. The rotary engine at the front turns the rear wheels, but not directly. Instead of a flywheel on back of the engine, the drawing shows a 25-kW electric motor and an inverter, then a driveshaft running to the transaxle. Along the axis of the transmission tunnel in a normal car, between the inverter and the transaxle, lies a 3.5-kWh battery running at 48 volts. MT writes that the electric motor can add its output to the ICE output to drive the rear wheels, or the e-motor can turn the rear axle on its own. Up front, two inverters and a double-layer capacitor join the ICE in the engine bay. The capacitor and tiny hub motors in the front wheels run at 120 volts, a higher voltage than the rest of the electrical system, so that the small in-wheel motors can generate the same torque as a larger motor running at a lower voltage. The AWD system acts on-demand. Given the signal, the capacitors discharge their energy to the wheel motors, and recover energy from braking. When the capacitors are at full charge, they send excess regen energy to the lithium-ion battery; conversely, the battery can recharge the capacitors when they're low and the front hub motors need power. The patent explains that the ICE works with the rear e-motor to drive the rear wheels at low speeds, the front motors called on to "generate an output only when a large output is required in the high vehicle speed range." The rather complicated system is focused on providing the benefits of a hybrid system and all-wheel drive, but at lower weight than one would expect. A rotary serves due to its compactness, but one of the drawings shows an engine with a V layout. Hub motors get dinged for adding unsprung weight, hence the small motors here.

Mazda Miata getting i-ELOOP regenerative 'braking' in more markets

The Mazda MX-5 Miata is getting the company's i-ELOOP regenerative "braking" system in more overseas markets. A few months ago, the company announced it for the Japanese market, and this week it announced the U.K. will have the feature, too. This has us curious as to whether it will be offered on U.S. market Miatas. We've reached out to Mazda, and we'll update this story if and when we hear back. As a quick refresher, i-ELOOP is a system that was introduced here on the Mazda6 several years ago, and it adds a capacitor to store electricity generated by the alternator during deceleration (hence our earlier use of quotes around "braking") that can be used to run interior accessories such as the sound system and climate control. Then, with power coming from the capacitor, the alternator can be disengaged, improving the efficiency of the engine by reducing drag. And by using a capacitor rather than a battery, the system is more compact, lighter and able to recharge faster than a similarly capacious conventional battery. As for effectiveness, the Mazda6 with i-ELOOP managed to get about 5% more miles per gallon on the highway than one without, going from 38 mpg to 40 mpg. While not a massive improvement, it was a measurable, possibly noticeable one. Applying a similar gain to a Miata would increase fuel economy from 35 to nearly 36.75 mpg on the highway, based on the automatic-equipped car's numbers. The manual would go from 34 to nearly 35.7. The i-ELOOP system is standard on all new Miatas in the U.K., which includes the 1.5-liter and 2.0-liter engines with either the manual transmission or automatic. Strangely, only automatic-equipped cars get it in Japan. This means Mazda could offer it on both transmission options in the U.S. Probably the key consideration will be cost. The system, when it launched in the U.S., was only available on the most expensive Mazda6, and even then it was an extra-cost option. And looking at pricing for the U.K. Miata soft-top and comparing equivalent trim levels, the price has increased between GBP2,800 and GBP4,100. The new model does get some new standard safety features, too, but we expect the i-ELOOP system is a significant contributor. If it is offered in the U.S., it might only be available as an option, and possibly only on the more expensive trim levels to keep lower trims more affordable. Related Video: This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings.

2019 Mazda CX-5 Signature Diesel First Drive Review | A tardy inessential

We were suspicious of the much-delayed Mazda CX-5 Diesel when it finally arrived at our office late this summer. Had it surfaced four or even two years ago, we might’ve been more bullish, but at least we werenÂ’t cynical — yet. Even the Volkswagen Dieselgate crisis couldnÂ’t turn our hearts against the CX-5 Diesel. We already like the CX-5, after all, we also like the eager torque, quiet ride and excellent fuel economy the Skyactiv-D engine would surely provide. But then we got the EPA ratings for the the CX-5Â’s diesel engine: 27 mpg city and 30 highway. Granted, thatÂ’s in an all-wheel-drive vehicle, but itÂ’s a serious disappointment. The turbocharged, gasoline-powered 2.5-liter I4 in the CX-5 Signature gets 24 combined mpg, while offering up to 250 horsepower and 310 pound-feet of torque. The diesel version is down 82 hp (at 168) and 20 lb-ft (at 290), while elevating fuel economy to 27 city, 30 highway and 28 combined. The non-turbo gas motor in lesser AWD trims narrows the gap to just 2 combined mpg in favor of the diesel. So whatÂ’s the selling point for the Skyactiv-D? Mazda says itÂ’s a premium experience, and thatÂ’s why itÂ’s only available in the top trim level. ItÂ’s easy to flinch at that, but it makes some sense, when you look at other diesels in the U.S. market The Signature trim of the CX-5, as with the Mazda6 weÂ’ve come to adore, is good enough to target the lower end of, say, Audi customers who are looking to get a bit more content for the buck. These might also be the same people whoÂ’ve come out of a TDI vehicle and are already sold on the diesel experience. From the first squeeze of our right foot, the diesel CX-5 makes a good impression. In town, we diced our way through Woodward Avenue traffic, made easy mostly by the CX-5Â’s relative small size and agility. There is one point in the throttle tip-in when the engine sounds particularly growly, and somehow more massive than its 2.2 liters of displacement. The illusion began to crumble when we reached our first highway entrance ramp. Putting our foot to the floor, we got the quick first hit of growly torque, followed by Â… well not much. This engine begins to run out of steam as it climbs the rev ladder. ThatÂ’s not totally unexpected, but it was definitely disappointing. Furthermore, as Assistant Editor Zac Palmer points out, “By opting for the diesel, you add 115 pounds to the curb weight (now 3,940 pounds) of a comparable 2.5-liter turbo (3,825 pounds).