Research Report RR:D02-1731

    Test Methods D2699 and D2700 utilize the same instrumentation to detect and measure knock caused by auto ignition of the air/fuel mixture in the CFR engine. The current system utilizes a 501C detonation meter to accept and condition the electrical signal produced by the detonation pickup and to provide an output signal to an analog knockmeter that displays the intensity of the knock signal. Because of projected unavailability of critical components for the 501C meter, a new knock measurement system was developed by the producer of the CFR engine, Dresser Waukesha. The new system accepts the same electrical signal from the same detonation pickup, but uses computer software to process the signal and measure the knock intensity. In this report, the new system is referred to as the New Digital Knock Measurement System, the Digital Panel and simply the Panel. This interlaboratory study (ILS) was undertaken in 2009 with two stated objectives: a. to determine if there is any statistically observable systemic bias between the 501C and the New Digital Knock Measurement System and b. to determine if there is any statistically observable difference in precision between the 501C and the New Digital Knock Measurement System.

    Published: October 2010

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