Spark ignited combustion engine analyzer
AssigneeSiemens Aktiengesellschaft
InventorsKlaus Roland Kuhn, Viktor Stigler
Life of this patent
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Abstract
An engine analyzer for examining the firing voltage curves of spark plugs in internal combustion engines in which two leads are taken from a tap on the high voltage side of the ignition coil with one lead provided to an amplitude discriminator for checking the trailing edge of the portion of the voltage curve referred to as the starting voltage line and the second to an amplitude discriminator for examining what is referred to as the combustion voltage line, with the discriminator outputs provided to a logic circuit which by properly combining the two discriminator outputs gives an indication of proper or improper firing and the type of malfunction present when improper firing occurs.
Claims7
An analyzer for the firing voltage curve in an internal combustion engine having a spark plug ignition system including an ignition coil with a tap on its high voltage side comprising:
- a. a first means having a first input terminal for coupling to the tap on the high voltage side of the ignition coil for detecting the trailing edge of the starting voltage line having a slope greater than a first predetermined value and providing an output indicative thereof;
- b. second means having a second input terminal for coupling to said high voltage tap for detecting a burning voltage whose average value is less then a second predetermined value and providing an output indicative thereof;
- and
- c. logic means having as inputs the output of said first and second means for decoding said output to provide a final output indicating the type of ignition occurring.
An analyzer according to clain 1 wherein said first means comprise:
- a. means for generating an output proportional to said first predetermined value;
- b. a first differential amplifier having the output of said means for generating coupled to one input terminal;
- and
- c. a differentiator coupling the output of said first input terminal to the other input of said differential amplifier.
Dependencies are inferred from the claim text.