Boots – shoes – and leggings
Patent
1990-04-11
1992-01-21
Cangialosi, Salvatore
Boots, shoes, and leggings
123425, F02P 514
Patent
active
050832786
ABSTRACT:
There is disclosed an improvement of a knocking detection device for an automotive engine mounted on a vehicle having a knock sensor for detecting analog vibration waveforms of the engine, and a crank position sensor for producing signals corresponding to a predetermined crank angle of the engine. The device comprises a conversion circuit for converting the analog waveforms detected by the knock sensor into digital data every predetermined sampling period; a decision circuit for deciding a first conversion term corresponding to no knocking period and a second conversion term corresponding to knocking possibility period in one cycle of the engine; a setting circuit for setting a discrimination level based on a first average value of the digital data from the conversion circuit during the first conversion term decided by the decision circuit; calculation circuit for calculating knocking level based on a second average value of the digital data from the conversion circuit during the second conversion term decided by the decision circuit; and a determination circuit for determining knocking occurrence by comparing the knocking level calculated by the calculation circuit with the discrimination level set by the setting circuit, so as to determine knocking occurrence when the knocking value is larger than the discrimination level.
REFERENCES:
patent: 4429565 (1984-02-01), Utsumi et al.
patent: 4710881 (1987-12-01), Mouri et al.
patent: 4750103 (1988-06-01), Abo et al.
patent: 4770144 (1988-09-01), Sakakibara
Cangialosi Salvatore
Fuji Jukogyo Kabushiki Kaisha
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