Circuit for measuring and storing peak values of ignition voltage in an internal combustion engine

Claim 1

A circuit for storing peak ignition voltage values in an internal combustion engine comprising a. a plurality of capacitors all having one electrode coupled in parallel to an ignition voltage source; b. a plurality of first switching transistors coupling said one electrode of corresponding ones of said capacitors to ground through their collector emitter path; c. an equal plurality of reesistors between said electrodes and said first switching transistors; d. an evaluator unit; e. A plurality of switches coupling said respective one terminals to said evaluator unit; f. a plurality of second switching transistors coupling the respective other terminals of said capacitors to ground; g. a plurality of second and third resistors coupling the bases of respective ones of said first and second switching transistors; h. means for providing a plurality of signals one associated with each individual cylinder of the engine, said plurality of signals being coupled to the bases of the respective second switching transistors and as control inputs to respective ones of said switches; i. a plurality of logic elements each having an output coupled to the junction of a respective second and third resistors, and each having as a first input a respective output of said means providing a plurality of signals; and j. means for providing a reset signal, said means having its output coupled as second input to all of said plurality of logic elements.