Measuring and testing – Engine detonation – Combustion signal compared to reference signal varied by a...
Patent
1980-06-05
1982-07-06
Ciarlante, Anthony V.
Measuring and testing
Engine detonation
Combustion signal compared to reference signal varied by a...
123406, G01L 2322
Patent
active
043376410
ABSTRACT:
A device for detecting engine knock is disclosed. The device comprises a bipolar vibration sensor secured to a spark ignition internal combustion engine and has first and second outputs for generating respectively signals representing individual ringing engine vibrations due to engine knock and signals representing the background engine vibrations due to engine operation, separately. A smoothing circuit is connected to the second output side of the vibration sensor for forming a means value of the background engine vibration signals. A comparator circuit has a first input terminal connected to the first output side of the vibration sensor and a second input terminal connected to the output side of the smoothing circuit for comparing the mean value of the outputs of the smoothing circuit with the peak value of the ringing engine vibration signals. A utilization circuit is connected to the output side of the comparator circuit for controlling the driving condition of the engine in an optimum manner. The bipolar vibration sensor comprises a first vibration section having a resonance frequency corresponding to the ringing vibration frequency due to engine knock and second vibration section having a resonance frequency different from the ringing vibration frequency.
REFERENCES:
patent: 3822583 (1974-07-01), Keller et al.
patent: 4002155 (1977-01-01), Harned et al.
patent: 4012942 (1977-03-01), Harned
patent: 4111035 (1978-09-01), West et al.
Muranaka Shigeo
Sugihara Kunihiko
Yoneda Kenji
Ciarlante Anthony V.
Nissan Motor Co,. Ltd.
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