Method of recording physical quantity change history, program thereof, flow rate measurement apparatus and fluid supplying system
US10323968B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 26, 2008 |
| Grant date | Jun 18, 2019 |
| Priority date | — |
| Expiry date | Jan 22, 2031 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY04S20/30
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
When an appliance identification art is provided, the computing speed and the identification accuracy are improved while the required memory amount, etc., is decreased. In a gas meter 100, an ultrasonic flowmeter 104 measures the flow rate of gas flowing into a flow path 102 at a given time interval, and a computation section 108 computes a difference value of the predetermined time period between the measured flow rates. A difference value conversion section 112 converts the computed difference value into a code with reference to a flow rate class table by which classes of difference values corresponding to a size of the difference value and codes representing the classes are associated with each other. Further, a flow rate change history generation section 114 generates a flow rate change history approximately representing flow rate change of gas based on a set of the codes of the predetermined time period.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.