Method and device for determining acceleration and/or deceleration of a moving object
US4408290A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 9, 1981 |
| Grant date | Oct 4, 1983 |
| Priority date | — |
| Expiry date | Jan 9, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P3/489
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An acceleration sensor acts on the variable-frequency pulses of a speed sensor signal to recognize any variation of the pulse period thereof and to produce an output indicative of the magnitude of the detected variation to within a fixed degree of accuracy. The periods of groups of known, variable number pulse groups are measured with reference to a fixed-frequency clock pulse signal and the measurement periods of successive groups of equal numbers of pulses are compared. If the difference between pulse group periods is zero or less than a predetermined value, the number of pulses in each group is increased in order to increase the total number of clock pulses during the measurement interval. The number of pulses per group is increased until the difference between measured periods exceeds the predetermined value or until the number of pulses per group reaches a predetermined maximum. Acceleration rate calculations and memory control procedures are designed to take into account the variation of the number of pulses per group.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.