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Why an independent rear suspension for GM's new, full-sized SUVs wasn't easy

A Motor Trend report last month laid out how Cadillac's 4.2-lier twin-turbo Blackwing V8 could be an orphan due to cost concerns in the GM empire. Last-minute chassis changes to Cadillac's new sedans and XT6 crossover led to engine bays that couldn't fit the Blackwing. On the SUV side, according to the report, the new independent rear suspension for big people haulers cost so much to implement that GM ruled out reworking the Escalade to accept the Blackwing. At least one commenter rightly asked how could a suspension swallow that much money. A new piece in Motor Trend has the answer. The excellent Alissa Priddle spoke to Tim Herrick, GM's executive chief engineer for full-size trucks, about why the clean-sheet IRS cost "multimillions of dollars."  First, GM would need to build a new body shop at the Arlington, Texas plant that assembles the automaker's big SUVs to stamp the numerous wholly new parts and panels accommodating an IRS. Then GM would need to design and pay for a new assembly process. On top of those up-front costs, there was the incremental cost of the four-link IRS components being more expensive than those in the trucks' former leaf-sprung solid axles. Herrick endured so many rejections for so long that he remembers the date and time when he got approval for the new unit. He said it came down to a meeting where he told a higher-up, "I'll make you a deal: If we get to the reveal, or if we launch this and you think this was a dumb idea, I'll hand you my badge and let you walk me out." Head to Motor Trend to read the full story. Based on Herrick being on stage to help present the new SUVs to the press, and on our First Ride in the new Chevrolet Tahoe and Suburban at GM's Milford Proving Grounds, it appears this will have a happy ending for all involved. Furthermore, since Herrick worked on the T1 platform that supports the big SUVs as well as the light- and heavy-duty pickups, he understood the demands on the commercial side, too. That could be why when Roadshow asked Tim Asoklis, chief engineer of the Tahoe and Suburban, if the new IRS could endure life in the Chevrolet Silverado and GMC Sierra, Asoklis answered, "Oh, absolutely." Related Video:    

Cadillac ELR next EV to get Plugless Power wireless charging tech

Evatran has been testing its Plugless Power wireless charging systems for electric vehicles in the Chevy Volt and Nissan Leaf for years now and made the tech commercially available early this year. With the growth of the EV market, Evatran is getting ready to expand as well. The company announced today that it will add three premium EVs to the Plugless Power system by the end of the year, with the first (and so far only) named model being the Cadillac ELR. We expect it was not difficult for Evatran to adapt the Plugless Power system to the ELR, since the vehicle's powertrain is so similar to the one in the Volt. The main problem we see is that Cadillac has only sold 390 ELRs (as of the end of June), so this first Plugless Power expansion isn't exactly going to ignite sales, even if every ELR owner opts for the cool tech. If one of the next two announcement is for the Tesla Model S, though, then you're talking numbers. Speaking of the future, what models do you think will be next? The Plugless Power L2 wireless systems were recently declared safe by the Intertek and start at $2,470, not including installation or government incentives. All the online/smartphone connectivity features that work with the car when it's got a cord stuck in it work with the L2 system, Evatran says. Orders start today, and the ELR package will be available September 1. There's more, including a local news report on the technology, below. WSLS 10 NBC in Roanoke/Lynchburg Va Wireless Vehicle Charging available to Cadillac ELR owners starting September 1st The Cadillac ELR Joins the Growing List of Compatible Electric Vehicle ("EV") Models from Evatran, the World Leader in High-Power Wireless Charging RICHMOND, VA July 28, 2014 – In an exciting statement today, Evatran Group, Inc. ("Evatran"), announced that its PLUGLESS wireless charging technology would soon be available on the Cadillac ELR. Evatran, the first Company in the world to make wireless charging available to individual EV drivers, currently has systems that are compatible with the Nissan LEAF and Chevrolet Volt. The Cadillac ELR is the first model to be announced in what is intended to be three new premium model announcements by the end of 2014. Evatran will begin accepting advanced orders today for deliveries as soon as September 1st. "The launch of the Cadillac ELR system is an important milestone for us," commented Rebecca Hough, Evatran CEO and Co-Founder.

Super Cruise’s failsafes

Even though Super Cruise is not a fully autonomous system, it incorporates redundancies like those used in aircraft to ensure failsafe operation. Before taking off on a 700-mile, 11-hour test drive of the system — and putting my life in its hands without my hands on the wheel — I sat down with Daryl Wilson, lead development engineer for Super Cruise, to get a deep dive into the system and its critical safety backups. Autoblog: First, what makes Super Cruise different from similar systems? Wilson: The key differentiator for Super Cruise is hand-free driving. It's an industry first in that respect. Our competitors require the driver at minimum to place their hands on the wheel with some frequency to ensure that the car knows that the driver is there. We don't. Two key technologies allow us to do this. One is our Driver Attention System, which is our methodology for making sure the driver is engaged with the vehicle and engaged with the road. This is a driver assist system, not a fully autonomous system. So it requires driver engagement. We use an infrared camera that constantly monitors the driver's face to determine the direction they're looking. We're looking for the driver to be what we call on-road — not on the center stack, not to left or right or down. That's all done by the tracking of the face. We also track that the eyes are open. It's infrared because at night you need to illuminate the face and you can't be shining a light into the driver's face. Then we have our lidar mapping that provides a foundation for control and redundancy to ensure safe performance. Autoblog: How does the mapping act as a redundant feature? Wilson: This system is only for use on divided, controlled access highways. What I mean by a divided highway is something more than a painted line between you and oncoming traffic. Whether that's a grassy area in between the lanes or a concrete barrier, anything that separates you from oncoming traffic. That's the divided highway part. The controlled access part is entrance ramps and exit ramps. Not with roads that cross at grade, with traffic crossing at the same level. To do that we geofenced these roads to ensure that operation is only allowed in these conditions. We don't just recommend you use it there; we ensure that you only use it there.