Electricity: measuring and testing – Internal-combustion engine ignition system or device – Electronic ignition system
Patent
1995-03-15
1997-05-20
Arana, Louis M.
Electricity: measuring and testing
Internal-combustion engine ignition system or device
Electronic ignition system
324378, F02P 1700
Patent
active
056315643
ABSTRACT:
Secondary current circuits are monitored in an ignition device of an externally ignited internal combustion engine having at least two primary current circuits each being closed and opened by one ignition end stage transistor. A base-to-emitter voltage of each ignition end stage transistor is measured and stored in memory with the primary current circuit closed. A comparison value is formed from at least two successive measured values and compared with a limit value. A failure signal is output as a function of the comparison. An apparatus for monitoring the secondary current circuits includes an engine or ignition control unit for making the ignition end stage transistors conducting or nonconducting. The control unit has a measurement input connected to the base terminals of the ignition end stage transistors, a measurement circuit for measuring values of successive base-to-emitter voltages of the ignition end stage transistors, a memory for storing at least two successive measured values, a comparison circuit for forming a comparison value of the stored measured values, and at least one comparator for comparing the comparison value with a predetermined limit value and for outputting a failure signal at an output if the comparison value exceeds or fails to attain the limit value.
REFERENCES:
patent: 4447880 (1984-05-01), Kasai et al.
patent: 5446385 (1995-08-01), Kugler et al.
patent: 5495757 (1996-03-01), Atanasyan et al.
Patent Abstracts of Japan, vol. 11, No. 261 (P-609) Aug. 25, 1987 & JP-62067473 (OKI) Mar. 27, 1987.
Patent Abstracts of Japan, vol. 17, No. 626 (P-1647) Nov. 18, 1993 & JP-520 3698 (OKI) Aug. 10, 1993.
Arana Louis M.
Greenberg Laurence A.
Lerner Herbert L.
Siemens Aktiengesellschaft
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