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Infiniti's new VC-T changes the rules of small turbocharged engines

The upcoming Infiniti QX50 crossover does not get our pulse racing, no matter how shapely the QX Sport Inspiration concept that previews it may be. No midsize SUV does, to be fair. But it has something special under the hood – the world's first production variable-compression-ratio engine. That means the QX50's 2.0-liter turbo four, which makes 268 horsepower and 288 pound-feet of torque, will have up to 27 percent better fuel economy. Here's how it works. The trend of moving to smaller, turbocharged engines carries with it one big falsehood. Under low load when the turbo isn't needed, these engines are less efficient than an equivalent engine without a turbo because of the low compression ratio the turbo requires. That is, if you never need the extra power, you're wasting fuel. Turbocharged (and supercharged) engines use a lower compression ratio to prevent detonation. When you force extra air in a cylinder and mix it with fuel, it's more likely to prematurely go boom. Lowering the compression ratio prevents this problem, but it's less efficient. Infiniti's VC-T promises the best of both worlds, with a compression ratio that ranges from 8.0:1 for high-power turbo needs to a 14.0:1 ratio for fuel-sipping efficiency. At its heart the VC-T engine is a simple idea, but it's complicated to explain. Consider yourself warned. The photo below from Infiniti serves as a good visual overview. For the truly nerdy, this patent application covers the mechanical concept. Instead of having the pistons connected to the crankshaft, Infiniti's engine has a pivot arm with a connection on each end. One end connects to the piston, the other connects to a second lower shaft, which is controlled by an actuator arm. At any given time the engine's pistons move up and down according to the lobes on the crankshaft. But the actuator arm can change the angle of the pivot arm up and down. That is, the pistons still move in the same motion with the same stroke, but phase the entire stroke up or down. Move the pivot up and there's less room at the top, which means a higher compression ratio. Move the pivot down and the compression ratio goes down, too. As an added bonus, the lower shaft eliminates the need for counter-rotating balance shafts. Infiniti says this system works constantly and can vary the compression ratio to any number between 8:1 and 14:1. It also uses electronic variable valve timing on the intake valves to switch into Atkinson-cycle combustion for greater efficiency.

Nissan, Kia under investigation over occupant detection systems

Kia and Nissan are facing separate investigations by the National Highway Traffic Safety Administration because of alleged problems with the occupant detection systems in their vehicles' airbags. The larger investigation is NHTSA's new engineering analysis into 986,826 Nissan and Infiniti vehicles. They include the 2013 Nissan NV200 and 2013-2014 Altima, Leaf, Pathfinder, and Sentra. Among the Infinitis, there are the 2013 JX35 and 2014 Q50 and QX60. Owners allege the occupant classification system can misidentify passengers and turn off the airbag if they don't weigh enough. Nissan recalled over a million vehicles worldwide last year to fix the same problem with a software update, but NHTSA kept getting complaints about the issue after the repair. The agency opened a preliminary evaluation in March, and after 1,271 complaints it has now been updated to an engineering analysis. The Feds intend to evaluate the effectiveness of Nissan's solution. NHTSA is also opening a preliminary evaluation into the 2007-2009 Kia Spectra for the occupant classification not working properly, and it could affect an estimated 186,000 of these vehicles. The government agency has 43 complaints from people allegedly reporting the failures. According to NHTSA, the issue could result in the airbag not deploying with enough force or not activating at all in an accident. This investigation is meant to assess the scope of the potential flaw, and there's no recall yet. INVESTIGATION Subject : Occupant Classification System Fault Date Investigation Opened: SEP 01, 2015 Date Investigation Closed: Open NHTSA Action Number: PE15031 Component(s): AIR BAGS All Products Associated with this Investigation Vehicle Make Model Model Year(s) KIA SPECTRA 2007-2009 Details Manufacturer: Kia Motors America SUMMARY: The Office of Defects Investigation (ODI) has received 43 complaints alleging a malfunction of the front passenger seat occupant classification system (OCS) in 2007-2009 Kia Spectra vehicles. The complaints report illumination of the SRS (air bag) warning light. All of the complaints allege the cause of the light illumination to be a malfunction of the OCS sensor mat imbedded in the passenger seat cushion, and/or report the presence of diagnostic trouble code B1448 which relates to the OCS sensor mat also. Many of the complaints note the malfunction occurred after the warranty period expired and mention high repair costs as a major deterrent to repairing the vehicle.

Tokyo court rejects Carlos Ghosn's bail request

TOKYO — A Tokyo court rejected former Nissan chairman Carlos Ghosn's latest request for bail on Tuesday, more than two months after his arrest. A statement from the Tokyo District Court announcing its decision gave no explanation for prolonging a detention of the 64-year-old executive, which has drawn international scrutiny of Japan's justice system. Ghosn had promised to wear an electronic monitoring ankle bracelet, give up his passport and pay for security guards approved by prosecutors in his latest attempt to gain release from a Tokyo detention center. His family said they will appeal. Ghosn has been in custody since Nov. 19. He had a bail hearing Monday. A Tokyo court rejected an earlier request for bail last week. Ghosn, who led Nissan Motor Co. for two decades, has been charged with falsifying financial reports in underreporting his compensation from Nissan over eight years, and with breach of trust, centering on allegations Ghosn had Nissan temporarily shoulder his personal investment losses and pay a Saudi businessman. Ghosn has said he is innocent, explaining that the alleged compensation was never decided, Nissan didn't suffer losses and the payment was for legitimate services. His wife, Carole Ghosn, appealed for his release through Human Rights Watch earlier this month, saying Ghosn's treatment has been harsh and unfair. Her views echo widespread criticism of Japan's criminal justice system both inside and outside Japan. Suspects who insist they are innocent get held longer. Suspects are held in a cell and routinely grilled daily by investigators without a lawyer present, although lawyers are allowed to visit. Ghosn's lawyer Motonari Ohtsuru has acknowledged Ghosn's release may not come until the trial, which may be six months away. A date for the trial has not been set. Nissan officials say an internal investigation has found that Ghosn had schemes to hide his income and that he used company money and assets for personal gain. A special committee Nissan set up after Ghosn's arrest to strengthen governance held its first meeting Sunday. Seiichiro Nishioka, a former judge and co-chair, told reporters after the meeting that Ghosn had shown questionable ethics, and too much power within the company had been focused in one person. The committee's findings are due by late March. Ghosn's pay was long a sticking point in Japan, where executives generally get paid far less than their American and other Western counterparts.