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GM executive chief EV engineer says reducing cost of plug-in vehicles is 'huge priority'

As we know, another major automaker investing heavily in electrified vehicles is General Motors, and it's doing things much differently than rivals BMW, Ford or Nissan. The Chevrolet Volt extended-range EV is a modest seller at its $35,000 sticker price but a huge hit with owners. The Chevy Spark BEV, still in limited availability, puts smiley faces on its owners and drivers. The just-introduced Cadillac ELR, a sharp-looking, fun-driving $76,000 luxocoupe take on the Volt's EREV mechanicals, has admittedly low sales expectations. With this interesting trio in showrooms and much more in the works, the third vehicle electrification leader I collared for an interview at Detroit's North American International Auto Show (see #1 and #2) was Pam Fletcher, GM's executive chief engineer, Electrified Vehicles. ABG: Why do your EREVs need four-cylinder power to extend their range when BMW's i3 makes do with an optional 650 cc two-banger? "We designed [the Volt and the ELR] to go anywhere, any time" - Pam Fletcher PF: I get that question all the time: why not something smaller? You don't really need that much. You use the electric to its ability, then you just need to limp. But we designed those cars to go anywhere, any time, and we don't want their performance to be compromised. If you're driving through the mountains, we don't want you to be crawling up grades, or to be limited on any terrain. So it's optimized to be able to travel literally the biggest grades and mountain roads around the globe at posted speeds. Because what if you can't? Another good reason: when the engine is on, you have to run it wide open throttle, max speed, most of the time. And while we can do a lot with acoustics, and the ELR has active noise cancelation, a small-displacement, low cylinder-count engine at high speed, high load all the time isn't something you want to live with. That's how we came up with the balance we did among the key factors of performance, NVH [noise, vibration and harshness] and range. ABG: Where you go from here? Is the range-extender engine due for an update? PF: We know and love the current Volt, and there is still a lot of acclaim about it, so we think it's a good recipe. But we are heavily in the midst of engineering the next-generation car, which I think everyone will love and be excited about.

GM plans new car family for global markets, $5B investment

Globalization remains all the rage in the auto industry, as manufacturers scramble to develop single vehicles that can easily be adapted to the world's disparate market places. Ford has been a champion of this movement, with its One Ford mandate, but now, its cross-town rival is getting in on the action, albeit on a smaller scale. General Motors has announced a $5-billion investment to develop a new Chevrolet-badged family vehicle for global growth markets, including Brazil, Mexico, India, and importantly, China. With the PRC listed as a target market for the new vehicle, it's no surprise that GM is teaming with its Chinese joint-venture partner, SAIC Motor, to develop the vehicle's architecture and engines. The first vehicles should be hitting dealers by 2019, with GM expecting to eventually move some two million units per year. "With a significant majority of anticipated automotive industry growth in 2015 to 2030 outside of mature markets, Chevrolet is taking steps to capitalize on that growth," GM President Dan Ammann said in the attached statement. "Strengthening Chevrolet's position through this major investment is consistent with our global strategy to ensure long-term profitable growth in the markets where we operate." GM is quite focused on developing markets for a new vehicle, going as far as to say that "mature markets" like the US aren't currently being considered for the new family vehicle. As for where it will be built, the press release specifically says it won't be exported to the US, meaning it will very likely be built abroad using parts from local suppliers. Read on for the official press release from General Motors. Chevrolet Strengthens Position in Growth Markets with $5 Billion Investment 2015-07-28 All-new vehicle family tailored to local customer requirements General Motors and SAIC Motor partnership further enhanced DETROIT – Chevrolet announced today it is investing $5 billion to strengthen its business in global growth markets through the development of an all-new vehicle family that will meet the rapidly changing demands of customers in these markets. "With a significant majority of anticipated automotive industry growth in 2015 to 2030 outside of mature markets, Chevrolet is taking steps to capitalize on that growth," said General Motors President Dan Ammann.

GM patent reveals new two-stage turbocharger

Modern turbochargers may be some of the best ever made, but performance is something that engineers are always trying to improve. According to GM Inside News, General Motors (GM) is hoping to alleviate some of the negative aspects of a two-stage turbocharger setup with a newly-patented design. The patent, that was filed on May 19, 2016, reveals a clever bypass system that allows the engine, a four-cylinder unit, to optimize both the low-pressure and high-pressure inlets for its respective functions. According to the filing, a conventional two-stage turbocharger setup is engineered to allow both turbines to operate simultaneously at low and mid engine speeds. At high engine speeds, only the low-pressure turbine works. The setup can't isolate either the low or high pressure side, which can impair low-end performance. GM's new two-stage turbocharger setup looks to eliminate this by linking the high-pressure turbo to the exhaust manifold through the high-pressure inlet duct. The low-pressure turbo is attached to the high-pressure turbo by a low-pressure inlet duct, which is linked to a connecting channel. A single actuator that is housed in the exhaust manifold creates a bypass that can opens the high-pressure inlet or close the connecting channel. Depending on what the engine load and speed is, the ECU guides the actuator—a single rotating spindle with discs corresponding to flanges on the high and low pressure sides—to isolate one of the two turbos. Isolating the turbos allow the respective inlets to be engineered for the best possible fluid dynamic performance. The setup should increase performance and decrease lag. There's no word on what car this setup will make an appearance on, but it will most likely be used in premium vehicles before trickling down to the rest of GM's vehicles. Related Video: News Source: GM Inside News, AutoGuide via GM Authority Cadillac Chevrolet GM Technology Sedan turbo patent engine turbocharging