F - Mech Eng,Light,Heat,Weapons – 02 – P
Patent
F - Mech Eng,Light,Heat,Weapons
02
P
324/15
F02P 17/00 (2006.01) F02P 17/04 (2006.01)
Patent
CA 1038452
A B S T R A C T This application discloses a method and apparatus for measuring and/or adjusting the average timing angle over all the cylinders of an internal combustion engine with reference to a single predetermined top dead centre position. The method of measuring the timing angle comprises the steps of running the engine and producing voltage pulsations of uniform time frequency against which are simultaneously taken measurements of two values; first, the measurements of engine speed by counting the number of pulsations for one full and precise revolution of the engine from top dead centre to top dead centre of one selected cylinder, and simultaneously counting the number of pulsations from the moment the spark plug of the selected cylinder fires to the top dead centre (for advanced firing), or from the top dead centre to the moment of firing of the spark plug (for retarded firing). Counting two of such values enables the testing personnel to express the timing angle in degrees and to have the RPM of the engine at the time of testing, neither of which would be avail- able if only one of such two values was measured. The disclosed test apparatus also provides a mechanism responsive to such measurements, which mechanism gives a readout of the revealed timing angle and compares it with the set range of timing angles, and a servo-mechanism which automatically adjusts the obtained timing angle to the desired value within such set angle.
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