Abstract:
Method and apparatus for detecting engine knock and measuring octane ratings of petroleum fuels in automotive engines and of measuring octane number requirements of said engines. Method and apparatus are herein described for maintaining a controlled knock condition in an internal combustion engine throughout a controlled acceleration of said engine by using a portion of the electrical output of at least one sensor device contacting said engine suitably processed to be proportional to the knock signal to control a servo device operating the spark timing for use in Modified borderline and Modified Uniontown knock rating. In octane number requirements work the signal is used to indicate the occurence of knock.