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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

First Cadillac ELR rolls off the line

Gearing up for the Belle Isle Grand Prix this weekend, General Motors invited some of the Chevrolet and Cadillac racecar drivers out to its Detroit-Hamtramck assembly plant. While there, the racers - including IndyCar Driver and Chevrolet Volt owner, Simona De Silvestro - witnessed the very first 2014 Cadillac ELR to roll off the assembly line.
These vehicles are not destined for customers, however, but instead pre-production units will be used by engineers for testing purposes. Actual production of ELR consumer models is expected to commence closer to the end of this year. As a refresher, this range-extended electric Cadillac shares much of its powertrain with the Volt but will have a sportier coupe design inspired by the Converj Concept. De Silvestro manged to snap a few images of here own, which you can see in the gallery below.

Cadillac recalls 120k examples of ATS for fire risk

Cadillac is recalling a total of 119,339 units (96,145 in the US alone) of the 2013-2016 ATS sedan, because the coil antenna module that powers the rear defogger can overheat. The problem has been linked to four fires, but there have been no injuries, fatalities, or crashes, according to the automaker. During manufacturing, the antenna might have been produced with "critically weak terminal connectivity." If being cycled on and off often or used continuously, these faulty examples can overheat, leading to a fire in the driver's side rear pillar. According to the company, "less than 1 percent of the recalled vehicles are expected to have the condition." According to the National Highway Traffic Safety Administration (in a PDF), the fix is a reflash for the ATS' Electronic Climate Control module that automatically turns on the rear defogger when the engine starts. In addition, 2013 models keep the system on continuously at low temperatures at highway speeds and this is also being disabled in the update. The changes are meant to cycle the coil less often, but owners can still turn it on manually. Related Video: GM Statement: General Motors is recalling approximately 96,145 2013-16 model year ATS sedans in the U.S. Some of these vehicles may have been manufactured with critically weak terminal connectivity in the coil antenna module, which powers the rear defogger system. If the module has the condition and is subjected to excessive cycling or continuous operation, it may overheat and a fire may develop inside the rear pillar on the driver's side of the vehicle. Less than 1 percent of the recalled vehicles are expected to have the condition. GM is aware of four fires but no injuries, fatalities or crashes. Including Canada, Mexico and exports, the total population of the recall is approximately 119,339. RECALL Subject : Rear Defogger Coil Antenna Module may Overheat Report Receipt Date: SEP 03, 2015 NHTSA Campaign Number: 15V558000 Component(s): VISIBILITY Potential Number of Units Affected: 96,145 All Products Associated with this Recall Vehicle Make Model Model Year(s) CADILLAC ATS 2013-2016 Details Manufacturer: General Motors LLC SUMMARY: General Motors LLC (GM) is recalling certain model year 2013-2016 Cadillac ATS sedan vehicles manufactured April 23, 2012, to September 2, 2015. In the affected vehicles, the coil antenna module that powers the rear defogger system may generate excessive heat due to excessive cycling or continuous operation.