30 L V6 Turbocharged Bluetec Diesel Engine Review
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| E320 BLUETEC. |
Mercedes-Benz Us (MBUSA) is introducing a express number of its E320 BLUETEC diesel sedans in California. The sedan is now available through a special 2-year/24,000-mile charter, and is charter-priced on a par with its gasoline sibling, the E350.
At its initial United states introduction, the E320 BLUETEC slightly exceeded the CA LEV Two, EPA Tier 2 Bin 5 emissions threshold, and then was not put on sale nationwide. (Earlier postal service.) To meet the stricter standards of California and the other LEV II states, Mercedes-Benz fabricated some modifications to the aftertreatment system, including changes in the control software. Although the catalyst material used in the NOten catalyst is the same, the unit is slightly different, co-ordinate to Professor Dr. Herbert Kohler, Vice President, Grouping Research & Advanced Engineering Vehicle and Powertrain, Mercedes-Benz Cars and Principal Environmental Officeholder for Daimler AG.
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| Aftertreatment organisation for the E320 BLUETEC. Click to enlarge. |
The E320 BLUETEC features a new-generation 3.0-liter V6 diesel engine. The new 72-caste V6 diesel features 4 valves per cylinder, dual overhead camshafts and centrally located piezo-electric fuel injectors. Designed to spray diesel fuel directly into the center of the combustion bedroom, each injector is positioned in the aluminum cylinder head about where a spark plug might exist found on a four-valve gasoline engine. This layout ensures even dispersion of fuel as its flame front spreads concentrically across the combustion chamber.
Although many non-turbo diesel engines take compression ratios college than 20:1, Mercedes engineers constitute that, in conjunction with the BLUETEC engine'south exhaust-driven turbocharger, the engine is about efficient with a compression ratio of 16.5:1. The turbocharger features Variable Nozzle Turbine (VNT) engineering which is integrated with the electronic engine management organisation. To vary the combustion air volume quickly, VNT adjusts the guide vanes electrically equally load and engine speed atmospheric condition change.
Diesel fuel engines unremarkably operate without whatever throttle in the intake system, so that fuel delivery lone controls engine load and speed. Nevertheless, Mercedes engineers constitute that, at light load, throttling one of the ii diesel intake ports on each cylinder creates air turbulence that helps optimize the combustion process and further reduce fuel consumption and exhaust emissions. The BLUETEC engine makes utilize of electronic intake port deactivation that'south automatically managed by the electronic control unit.
The quick piezo-electric injection system enables the application of a few pilot injections in rapid succession simply milliseconds before the main injection to pre-oestrus the combustion chamber, thereby making force per unit area and temperature increases more than gradual. Smoothing out combustion pressure and temperature spikes softens the usual diesel noise and reduces oxides of nitrogen formation likewise.
In addition to using pilot injection and exhaust gas recirculation to minimize oxides of nitrogen, the E320 BLUETEC engine features an advanced-technology NOxstorage goad that temporarily stores oxides of nitrogen. Regeneration pulses release a course of nitrogen oxide that reacts with exhaust gas to become nitrogen. Command of these regeneration events was 1 of the modifications made to bring the E320 into compliance with LEV Ii.
The 208 hp, 400 lb-ft E320 BLUETEC carries a fuel economy rating of 35 mpg.
The California lease program volition function as a bridge every bit MBUSA prepares to brainstorm phasing in 50-state BLUETEC vehicles nationwide starting in 2008. The beginning step will be the extension in January 2008 of the special charter program to other states which accept adopted the California emissions standards and then which do non currently allow sales of new diesel fuel automobiles.
Later in 2008, Mercedes will introduce another BLUETEC system on its M-, R- and GL-Grade vehicles. This arrangement utilizes AdBlue injection, a process that adds precisely measured quantities of a urea-based solution into the frazzle stream which enhances long-term emissions performance sufficient to meet the Tier two Bin 5 standards.
MBUSA will offer l-country diesels across its SUV model lines (Thousand, GL and R-Class) late next year and volition go on to add to its alternative powertrain offerings, with BLUETEC balmy hybrids, 2-mode gasoline hybrids, and more BLUETEC models announced to exist delivered over the next few years. (Earlier mail.)
Source: https://www.greencarcongress.com/2007/10/mercedes-benz-i.html
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