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Active regeneration happens while the vehicle is in use, when low engine load and lower exhaust gas temperatures inhibit the naturally occurring passive regeneration. Sensors upstream and downstream of the DPF (or a differential pressure sensor) provide readings that initiate a metered addition of fuel into the exhaust stream.
An exhaust brake is a means of slowing a diesel engine by closing off the exhaust path from the engine, causing the exhaust gases to be compressed in the exhaust manifold, and in the cylinder. Since the exhaust is being compressed, and there is no fuel being applied, the engine slows down the vehicle: the crankshaft (and, hence, the wheels ...
Diesel exhaust is the exhaust gas produced by a diesel engine, plus any contained particulates. Its composition may vary with the fuel type, rate of consumption or speed of engine operation (e.g., idling or at speed or under load), and whether the engine is in an on-road vehicle, farm vehicle, locomotive, marine vessel, or stationary generator ...
It may be as high as the 1000 Kelvin exhaust gas temperature for a supersonic afterburning engine or 2200 K with afterburner lit. [31] The pressure entering the nozzle may vary from 1.5 times the pressure outside the nozzle, for a single stage fan, to 30 times for the fastest manned aircraft at Mach 3+. [32]
The pressure distribution on a test model has historically been measured by drilling small holes on the surface, and connecting them to manometers to measure the pressure at each hole. Pressure distributions can be measured more conveniently using pressure-sensitive paint , [ 25 ] in which pressure is indicated by the fluorescence of the paint.
Unique interior features include black sport seat cloth with red stitching and SE-R embroidered logos, sport metallic-tone accents, aluminium pedal pads, and twin pod meters with oil pressure and G-sensor displays. Also, the 2007-2012 Sentra SER was the only Sentra in the lineup to not change its front bumper design in 2010.