| 摘要 |
A method and apparatus is provided for graphically displaying gas emission levels of certain selected ingredients of an exhaust gas collected by an engine analyzer system during a 240-second emission test. The emission levels are variable with the speed of the vehicle under test. The graphic display may further include a waveform showing the maximum allowable gas concentration levels of a selected ingredient gas. Additionally, where a number of tests have been taken, the first, previous and last concentration level waveforms may be simultaneously displayed (using different line hashings or colors) for communicating comparison information to the technician. Finally, the technician may selectively display, in graphical form, a speed-correlation waveform (actual or ideal). Speed and gas emission levels are displayed on appropriate y-axes located on opposite sides of the graph. Additionally, all waveforms are auto-scaled to facilitate ease of reading.
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