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Mazda patents show rotary engine for range-extended EV

Two years ago, Mazda introduced a fascinating range-extended electric car called the Mazda2 RE Range-Extender. It took an electric Mazda2, and dropped in an itty-bitty 330cc rotary engine. It wasn't the rotary-powered sports car we had hoped for, but it seemed like a unique way to keep the quirky engine alive and kicking. But not long after the car's reveal, it seemed to disappear. Now the basic idea has resurfaced with a few modern updates in a couple of US patents. The first patent is pretty straightforward and describes a range-extended EV similar to the BMW i3. At the front is an electric motor driving the front wheels. At the back is an internal combustion engine that powers an electric generator. In the middle is a lithium-ion battery for storing and delivering electricity. It's the same set-up as that Mazda2. The second patent is for an engine start-and-stop system, but specifically for rotary engines. The system is designed to shut off a rotary engine when not needed, much as modern piston engines do. It also stops the rotor in a position that closes the intake port to ensure no fuel or exhaust emissions slip out through the intake tract. This is necessary since there are no valves in a rotary, and air and exhaust come through ports that are "opened" and "closed" by the rotor itself. The patent also describes the possibility of firing a spark plug after the fuel has been cut to eliminate any leftover fuel emissions. This system would theoretically improve a rotary engine's fuel economy and emissions significantly, which would be a boon as those are two of the rotary's major weaknesses. The rotary-engine patent also includes the same range-extended powertrain drawing as the first patent. It's there as a description of a possible application. And in such an application, where the rotary wouldn't have to run all the time, the system could take advantage of the rotary's inherent strengths. Weight can be kept low thanks to the engine's small dimensions, which should help in keeping the car sprightly and efficient. Rotaries are renowned for smoothness, too, so it shouldn't need too much refining and sound deadening, the latter of which adds more weight. The small size would also help with packaging, leaving more space for people, cargo, or possibly batteries. And since it has been patented, the company may be looking to bring the system to market.

2014 Mazda6 i-Eloop to net 40 mpg hwy, 28 mpg city

Even before Mazda unveiled the 2014 Mazda6, it had introduced its innovative, non-hybrid i-Eloop (Intelligent Energy Loop) brake regeneration system. This technology converts kinetic energy into usable electricity using the alternator, a DC/DC converter and a capacitor mounted just behind the front fascia. During deceleration, the alternator captures energy that is then stored in the capacitor, which can later be used to directly power electric devices like climate control and audio systems. When i-Eloop power is used, it reduces the load on the engine and helps to conserve fuel.
Now available on the Mazda6, i-Eloop is only available on the $29,695 Grand Touring trim level as a part of the $2,080 GT Technology Package, meaning that buyers desiring i-Eloop will have to spend at least $31,775 (not including destination). The added price of this technology should be worth it for those looking for optimal fuel economy as the i-Eloop, combined with the package's active grille shutters, will bump the sedan's fuel economy numbers up to 28 miles per gallon city and 40 mpg highway - both are improvements of 2 mpg over the standard Mazda6 Grand Touring. The GT Technology Package also includes a Sport mode, lane departure warning, high beam control, radar cruise control and forward obstruction warning - the latter two technologies are currently offered in a $900 package that is being discontinued.
i-Eloop will eventually be offered on other Mazda products including the 2014 Mazda3. Scroll down for the official press release on the Mazda6's fuel-saving i-Eloop technology.

Mazda6 diesel engine delayed over low performance, still coming

Oh Mazda... we had many hopes for the promised diesel four-cylinder in the Mazda6, but those have remained largely unfulfilled, as the oil-burning powerplant has failed to appear on dealer lots following its 2012 LA Auto Show announcement. Despite engineering issues that forced the company to announce that the program was delayed back in September 2013, Mazda remains adamant that the 2.2-liter Skyactiv-D is still coming to our shores. "We're still very much committed to diesel," Mazda's North American CEO, Jim O'Sullivan, told Automotive News. "We are still working on getting the performance aspects up to where we want them, and we do have a plan – an engineering road map – to get it done." According to AN, Mazda's initial plan with the 2.2-liter diesel was to build an engine so clean it could get by without an aftertreatment system, which generally accounts for the price premium of diesel engines versus their gas counterparts. The new system has come with performance issues, though, necessitating the delays. "If [we were] a commodity brand and didn't care about that, it would be on the market right now," O'Sullivan told AN. "But I know the people were expecting something from us, expecting certain drive characteristics and performance, and I didn't want to disappoint them." While O'Sullivan's defense of the diesel Mazda is admirable, the exec stops short of giving us an indication of when the new engine will finally arrive.