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Renault-Nissan reportedly partnering with Waymo on self-driving cars

The Renault-Nissan-Mitsubishi alliance will tie up with Alphabet Inc's Waymo to develop autonomous taxis and other services using self-driving vehicles, the Nikkei reported on Tuesday. Google's self-driving car company Waymo will work with the carmakers and announce a plan for the arrangement as early as this spring, the business daily reported. The partners are considering the joint development of unmanned taxis using Nissan vehicles and a system that handles reservation and payments, Nikkei said. A spokesman at the Renault-Nissan-Mitsubishi alliance, Nick Twork, said, "This (Nikkei) story is based on rumors and speculation. We have nothing to announce." Waymo did not immediately reply to a request for comment. Last month, Nissan Motor Corp said its board remained committed to the carmaker's alliance with Renault SA and Mitsubishi Motors Corp, after directors met to discuss the ongoing investigation into former chairman Carlos Ghosn and ways to bolster governance. Among the companies developing autonomous driving technology, Waymo is considered to be far in the lead in terms of test-fleet miles driven. It operates hundreds of vehicles in 25 U.S. locations, and is already operating a taxi service with paying customers in Chandler, Ariz. Related Video:

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.

NHTSA opens investigation into 130k Nissan Versas for breaking springs

The National Highway Traffic Safety Administration has opened a preliminary evaluation into a suspension problem that could affect an estimated 130,000 Nissan Versas from 2008-2010. According to the government agency's documentation (here as a PDF), there have been 93 complaints of the front coil springs fracturing while driving in these vehicles. Based on reports so far, it appears to NHTSA that this problem can happen at any speed and without warning. When the spring breaks, the pieces can also puncture a tire or brake line. A preliminary evaluation sets out to investigate "the scope, frequency and safety-related consequence" of the potential problem. According to a portion of a statement from the automaker to Autoblog, "Nissan is cooperating fully to answer the agency's questions regarding this issue in a timely manner." INVESTIGATION Subject : Front Coil Spring Fracture Date Investigation Opened: MAY 13, 2015 Date Investigation Closed: Open NHTSA Action Number: PE15019 Component(s): SUSPENSION All Products Associated with this Investigation Vehicle Make Model Model Year(s) NISSAN VERSA 2008-2010 Details Manufacturer: Nissan North America, Inc. SUMMARY: The Office of Defects Investigation (ODI) has received 93 complaints (VOQs) alleging incidents of front suspension coil spring fracture in model year (MY) 2008 through 2010 Nissan Versa passenger cars. Preliminary analysis of the complaints indicates that the coil spring failures occur without warning and can happen at any speed. One complaint (VOQ #10663102) reported the passenger-side coil spring fractured while traveling at 65 mph and caused a sudden tire failure by cutting the inner sidewall 360 degrees. Another complaint ( VOQ #10680740) reported the passenger-side coil spring fractured while traveling 40 mph and result in tire puncture and brake line failure. ODI has also received EWR field report information relating to coil spring failures in the subject vehicles. A Preliminary Evaluation has been opened to assess the scope, frequency and safety-related consequence of the alleged defect.