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Is simple method is to use the vehicle chassis dynamometers and other equipment, drum test stand by the road simulation of the actual vehicle driving conditions, on automobile emissions testing methods. According to environmental experts, this method has an advantage that can simulate actual vehicle operating conditions, with four advantages: first test cycle includes idle, acceleration, constant speed and deceleration
Of various work conditions, to reflect the actual driving of vehicles when emission characteristics; second is that it is transient condition, to overcome the old methods can not detect a problem with oxygen sensor EFI car out of control thereby increasing the exhaust airfuel ratio caused by defects in the sewage; Third, high detection accuracy, false positives rate was only
5 The following; Fourth can detect carbon monoxide, hydrocarbons and nitrogen oxides three kinds of pollutants, and to g  km that is conducive to urban vehicle pollution emissions statistics, motor vehicle pollution control in urban development planning has practical significance . Reporter has learned that Beijing in the implementation of Simple Transient method, the test field on the vehicle exhaust