Integrated fuel dispensing and accounting system
An interface system extends a prior-art fuel delivery pump and reservoir so that authorization to activate the fuel delivery pump can be obtained from a remote authorization service over a long-range wireless communication link such as a cellular telephone connection or a satellite connection; and delivered to the interface system over a different, short-range wireless communication link such as a Bluetooth® connection or a WiFi connection. The system is structured so that different data link devices can serve in one part of the communication chain. Asynchronous methods allow the system to operate securely when a data link device is not able to provide a synchronous link at a time when fuel dispensing is desired.
1. A fuel-dispensing and accounting system operated by cooperation among a plurality of devices, comprising:
a control center having a master distributed database;
a fueling station having a first portion of the master distributed database; and
a user device having a second portion of the master distributed database, wherein
the fueling station lacks communication facilities to provide continuous direct or indirect communication with the control center;
the user device includes communication facilities to provide intermittent, temporary indirect communications between the fueling station and the control center via the user device; and
all of the control center, the fueling station and the user device comprising data and instructions to cause the devices to interact as follows:
the user device and the fueling station establish a communication link at a time when the user device cannot provide temporary indirect communications between the fueling station and the control center;
at least one database update passes between the user device and the fueling station over the communication link, said at least one database update causing a change in either the first portion of the master distributed database or the second portion of the master distributed database;
the fueling station evaluates records in the first portion of the master distributed database and an identifier of the user device to determine whether the user device is currently eligible to activate the fueling station; and
when the user device is currently eligible to activate the fueling station, then
activating the fueling station,
dispensing a quantity of fuel from a reservoir of the fueling station,
adding a new transaction record to the first portion of the master distributed database, and
terminating the communication link.
2. The fuel-dispensing and accounting system of claim 1 further comprising a second, different user device, and wherein the fueling station and the second different user device interact as follows:
the second user device and the fueling station establish a communication link at a time when the second user device cannot provide temporary indirect communications between the fueling station and the control center;
the new transaction record is transmitted from the fueling station to the second user device as a distributed database update; and
the second user device updates its portion of the master distributed database to include the new transaction record.
3. The fuel-dispensing and accounting system of claim 1 wherein the user device is currently eligible to activate the fueling station when the identifier of the user device is involved in at least a predetermined minimum number of sync'd transaction records in the first portion of the distributed database.
4. The fuel-dispensing and accounting system of claim 1 wherein the user device is currently eligible to activate the fueling station when the identifier of the user device is involved in no more than a predetermined maximum number of unsync'd transaction records in the first portion of the distributed database.
5. The fuel-dispensing and accounting system of claim 1 wherein the user device is currently eligible to activate the fueling station if offline activities have not been terminated via a distributed database update from the control center.
6. The fuel-dispensing and accounting system of claim 1 wherein the user device is currently eligible to activate the fueling station if offline activities of the fueling station have not been terminated via a distributed database update from the control center.
7. The fuel-dispensing and accounting system of claim 1 wherein the user device is currently eligible to activate the fueling station if offline activities of the user device have not been terminated via a distributed database update from the control center.
8. The fuel-dispensing and accounting system of claim 1 wherein the user device transmits a distributed database update to disable all system offline activities to the fueling station.
9. The fuel-dispensing and accounting system of claim 1 wherein the user device transmits a distributed database update to disable all offline activities of the fueling station to the fueling station.
10. The fuel-dispensing and accounting system of claim 1 wherein the user device transmits a distributed database update to disable all offline activities of the user device to the fueling station.
11. The fuel-dispensing and accounting system of claim 1 wherein the user device transmits a distributed database update to disable all offline activities of a different user device to the fueling station.