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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.

2016 Mazda MX-5 Miata Club long-term wrap-up | Farewell, fun friend

About one year ago, we took delivery of a 2016 Mazda MX-5 Miata. We made sure we got the sportiest version we could, the Club model (which includes Bilstein shocks, a limited-slip differential and a front shock tower brace) with optional BBS wheels and Brembo brakes. We also sprung for the appearance package to give our cute little roadster a modicum of aggression. It was a tad pricey at $32,835, but we enjoyed every minute of it. Well, almost every minute of it. It's not a perfect car, as it's loud and stiff on the highway, and we ran into an issue in which the top had to be replaced (under warranty). But minor grievances aside, just about everyone who drove the little roadster came back with a smile, especially when we took it to a racetrack. Below are final thoughts on the car from our editors. Senior Green Editor John Beltz Snyder: This car is about as car as any car gets. It's so car! That is to say, it's pure in its mission and in its effective execution as a driver's plaything. Its crisp steering, snickety six-speed manual gearbox, and rev-happy engine create the wonderful sensation that you're driving faster than the speedometer reads. Normal speeds never felt so heroic. The view out the front is fantastic, too, and the curves of the hood are nothing short of inspiring as they frame the road ahead. I don't care that it's noisy, jarring, and ergonomically weird. Old and British in spirit, it offers a level of engagement that's hard to find in a new car, especially for under $30,000. Anyone who has a Miata in their stable isn't lucky. They're smart. Senior Editor Alex Kierstein: I'm a bit embarrassed to think back to my first impressions about driving the MX-5 now that I've had so much seat time in this one. While I loved the idea of it as a throwback to the original NA Miata from the moment it was revealed, I was a bit turned off by how civilized it was. And how quick it was. No longer a momentum car, the new MX-5 seemed more forgiving of bad gear selection or a bad corner entry. I felt like something had been removed, a ragged edge, some everyday engagement. Well, a year on, and my feelings have changed. If you stop comparing it directly to the (slow, weedy, rattly, uncomfortable) first- and second-generation cars, it's a brilliant little roadster. I miss the raw edge less and enjoy the livability more — the raw edge was really just a lack of civility. A flaw that forced you to engage with the thing every moment.

Mazda going back to oval grille with next MX-5 Miata

The original Mazda MX-5 Miata was distinguished by an oval grille - a design trait that gradually evolved into the smiling cat face on the latest model. But Mazda, according to the latest intel, is planning on returning to that oval grille with the new model in the works.
The revised grille will cap a slightly longer form than models past, while still keeping weight down to a minimum. The stretched wheelbase was reportedly adopted in order to meet the requirements of Alfa Romeo, which is jointly developing the new platform together with Mazda for use on a new roadster of its own.
The new Miata is expected to adopt the 1.5-liter Skyactiv four found in the Mazda3, albeit returned to rev higher and deliver more power and torque, mated to either a six-speed manual or automatic. The Alfa version, meanwhile, is expected to use a 1.4-liter turbo four with a dual-clutch transmission. Sources anticipate the new MX-5 to debut first, possibly at the 2015 Chicago Auto Show a little less than a year from now.