Apparatus for processing knock sensor signal
US6750798B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 19, 2002 |
| Grant date | Jun 15, 2004 |
| Priority date | — |
| Expiry date | Nov 19, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L23/225
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A signal-processing apparatus has a digital filter for processing input data from a knock-sensor. The digital filter is designed as an FIR filter characterized by filter coefficients that are equal to values of mince points 0 to 16 obtained based on a reference waveform. The reference waveform is created by concatenating half waves of a first sinusoidal waveform with half waves of a second sinusoidal waveform with peak values equal to half the peak value of the first sinusoidal waveform. The values of mince points 4, 8 and 12 are 0. Each value of mince points 1, 3, 13 and 15 is equal to corresponding value of mince points 5, 7, 9 and 11. The digital filter effectively reduces a filter-processing load.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.