Method for collecting pressure data from a fuel tank
US5652393A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 6, 1995 |
| Grant date | Jul 29, 1997 |
| Priority date | — |
| Expiry date | Jun 6, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L9/12
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for collecting pressure data from a fuel tank in a motor vehicle is achieved by providing an analog pressure transducer in communication with a capacitor, at least one resistor in communication with the capacitor, and a gate to control the communication between the resistor and the capacitor. Software in a microprocessor controller compares the voltage across the resistor to a reference voltage as the capacitor discharges, determines the number of clock counts for which a predetermined relationship exists between the voltage across the resistor and the reference voltage, then consults a table to determine an absolute pressure based on the clock count. The microprocessor transmits the absolute pressure to the central vehicle computer via a multiplex data bus system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.