G - Physics – 01 – M
Patent
G - Physics
01
M
73/168
G01M 15/00 (2006.01) F01N 11/00 (2006.01) G01M 15/02 (2006.01) G01M 15/10 (2006.01)
Patent
CA 1110087
ABSTRACT OF THE DISCLOSURE Modal test method and apparatus is described for use in automotive engine plants, vehicle inspection stations, diagnostic centers, etc., for quickly, accurately and repeatably measuring the principal air contaminants; i.e., carbon monoxide (CO) and hydrocarbons (HC) in engine exhaust gas emissions. Quantative measurement of oxides of nitrogen (NO ) and oxygen (O2) may also be measured if desired. While O2 is not an air contaminant, a measure of its concentration in the exhaust gas has diagnostic value. The engines are tested at prescribed modes of operation (usually three; high cruise, low cruise and idle) at which emission-related engine malfunctions, if they exist, are most likely to be exposed. CO and HC (NOx and O2 if desired) evaluations are made at each test mode and may be recorded on a "report card". The measured test values of the air contaminants are compared to each test mode with prescribed permissible values either automatically or manually. For example, the mea- sured values may be recorded on a report card which includes the permissible values. An excessive value of the measured air contaminants for any prescribed mode indicates an emission-related malfunction and warrants rejection. Adjust- ment or repair to correct malfunctions is facilitated by providing "truth chart" having a reject pattern matching that on the report card and a written statement of the probable defects and the recommended repair guidelines to enable a mechanic to quickly correct the malfunction. A fixed-fill power absorption device automatically provides a repeatable predetermined engine load at a predetermined test speed for each mode, in accordance with a substantially cube power/speed curve. An engine evaluation test can be made utilizing the usual three prescribed test modes in conjunction with a fourth mode, namely, engine operation at full throttle. The latter test may require a power absorption device capable of varying the load on the engine at any speed. More sophisticated optional equipment provides automatic read-out means for printing measured CO and HC values, with a red print-out for excessive values requiring rejection.
257616
Cline Edwin L.
Tinkham Leland P.
Clayton Manufacturing Company
Hirons & Rogers
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