Measuring and testing – Engine detonation – Combustion signal compared to reference signal varied by a...
Patent
1981-11-17
1983-12-20
Myracle, Jerry W.
Measuring and testing
Engine detonation
Combustion signal compared to reference signal varied by a...
731173, G01L 2322
Patent
active
044209681
ABSTRACT:
A device for detecting undesirable combustion processes in internal combustion engines having spark-ignition systems, an acceleration sensor and a band-pass filter tuned to a frequency of a knocking vibration, with an output value of the filter being compared with a reference value, whereby results of the comparison are compared with undesirable combustion processes to be detected. Body noise signals received by the acceleration sensor pass through a band-pass filter. A series circuit composed of a band-blocking filter tuned to the frequency of the knocking vibration, including an r.m.s. rectifier and an amplifier, is provided through which the body noise signal received by the acceleration sensor is converted into a reference signal. A comparator is provided when the reference signal and the knocking signal are compared with one another, whereby an output signal appears when the knocking signal exceeds the reference signal. The band-blocking filter is constructed so that in addition to suppressing the knocking frequency, the filter also suppresses all frequencies below a lower frequency less than the knocking frequency and above an upper frequency higher than the knocking frequency. An output evaluation device is provided for evaluating the reference signal with a factor which is a function of the engine rotational speed, and a timer which acts as a monostable flip flop is disposed after the comparator.
REFERENCES:
patent: 4012942 (1977-03-01), Harned
patent: 4364260 (1982-12-01), Chen et al.
patent: 4368635 (1983-01-01), Yoshida
Dudeck Ingo
Maass Manfred
Daimler-Benz Aktiengesellschaft
Myracle Jerry W.
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