Title:
KNOCKING CONTROL DEVICE
Document Type and Number:
Japanese Patent JP3205375
Kind Code:
B2
Abstract:
PURPOSE: To decide knocking of an internal combustion engine without being influenced by noise.
CONSTITUTION: A knocking signal (b) detected by a knock sensor 1 is enveloped and detected through a band pass filter 2 and a rectifying detecting circuit 3. The enveloped and detected signal (c) is converted into a digital signal Vp by means of an A/D converter 4a and inputted to a differentiating circuit 12. An output (d) from a differentiating circuit 12 is compared with a threshold 16 by a comparator 13. Given delay is made on an output (e) from the comparator 13 by means of a delay circuit 14 and the output is inputted to the interrupting means 15 of a microcomputer 9. The interrupting means 15 reads an output Vp from the A/D converter 4a at the rise stage of an input signal to produce a knocking value. This constitution causes the interrupting means 15 to read the output Vp in a way to prevent mixture of noise in a knocking signal even when the knocking signal is mixed in noise and decides knocking without being influenced by noise.
Inventors:
Susumu Maeda
Application Number:
JP7219392A
Publication Date:
September 04, 2001
Filing Date:
February 24, 1992
Export Citation:
Assignee:
Honda motor industry stock company
International Classes:
F02D45/00; F02P5/15; F02P5/152; F02P5/153; (IPC1-7): F02P5/152; F02D45/00; F02P5/153
Domestic Patent References:
| JP58105036A | ||||
| JP5728842A | ||||
| JP618472A | ||||
| JP58187831A | ||||
| JP56141533A |
Attorney, Agent or Firm:
Michito Hiraki (1 person outside)