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In view of the electrical control system of a 6 cylinder gas machine,we selected Infineon XC2785 as the micro control union and designed a set of ignition driven based on MC33810.Through the analysis and diagnosis of crankshaft and camshaft signal,ECU could judge the state of speed sensor. According to the judgment of normal or missing state of speed sensor signal,we designed the corresponding output ignition control strategy.ECU used the crankshaft and camshaft signals to judge the compression TDC and controlled the ignition timing.According to the different crankshaft rotation delay on account of different rotating speed,the ignition output strategy of counting teeth and timing was designed.Finally the feasibility of the algorithm was verified by experiment.