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Exhaust gases L A A <br /> The best known test procedures - the Europa Sampling). Soo next pago for graphs and dia- <br /> Test and the US Federal Test -- are described dram. <br /> below. The exhaust gases emitted by the vehicle <br /> during the test cycle are diluted with purified <br />•Europa Test ambient air and extracted by means of a rotary- <br /> All gases emitted during the test are collectod piston compressor. This compressor operates <br /> in a teflon-coated bag and a sample is analyzed. with a constant delivery rate,which is markedly <br /> The bag is sucked empty through a gas meter in excess of the exhaust flow. In this way no <br /> to measure the exhaust-gas volume. water whatsoever precipitates during sampling. <br /> The masses of hydrocarbons. carbon Instead of the entire diluted exhaust flow, only <br /> monoxide and oxides of nitrogen released in a small sample having the same instantaneous <br /> the test are calculated on the basis of tho composition is routed to the collector bag. <br /> exhaust-gas volume(adjusted to standard con- After the driving cycle, the concentration of <br /> ditions). concentration and density of the toxic toxic substances here is exactly the same as <br /> substances.The figures for registered vehicles at the center of the exhaust-gaslair mixture <br /> should not exceed the limits specified on p. 454 extracted. With the known delivery rate of the <br /> which Increase with vehicle weight. in order to rotary-piston compressor adjusted to standard <br /> satisfy registration regulations completely tho conditions and density values, the masses of <br /> carbon monoxide concentration at idling and toxic substances emitted during the test can <br /> the effectiveness of the positive crankcase also be calculated. <br /> ventilation system must also be checked (sea The US limits are applicable to all newly <br /> p.454, ECE Types It and 111). registered passenger cars, irrespective of <br /> swept volume and vehicle weight. They must <br /> US Federal Test also be maintained after 50000 miles, proof <br /> Also known as CVS Test (Constant Volume <br /> km/h <br /> 40- <br /> 20- <br /> 0 <br /> 0200 <br /> 0 100 200 300 400 Soo 600 700 800 S <br /> Driving cyclo of Europa Test <br /> Collector bag <br /> { 1Ce H 1i <br /> 5 ma) <br /> • - co <br /> Cooler — • - -1 . Ct7. Ftt�i3tigi-urns <br /> temperature <br /> O O <br /> Nix Outlet <br /> r <br /> \ Supply pressure <br /> Brake Inertia flywheel of gas motor Gas meter <br /> Test setup for Europa Test <br />