Measuring and testing – Vehicle chassis – Steering
Patent
1975-07-28
1976-12-21
Myracle, Jerry W.
Measuring and testing
Vehicle chassis
Steering
73 23, 73 497, G01M 1500
Patent
active
039980952
ABSTRACT:
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. Quantitive measurement of oxides of nitrogen (NO.sub.x) and oxygen (O.sub.2) may also be measured if desired. While O.sub.2 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 (NO.sub.x and O.sub.2 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 at each test mode with prescribed permissible values either automatically or manually. For example, the measured 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. Adjustment 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.
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patent: 3864964 (1975-02-01), Voelz
Cline Edwin Lee
Tinkham Leland P.
Clayton Manufacturing Company
Myracle Jerry W.
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