Device for measuring a fuel flow and calibrating device therefor
AssigneeHoriba Europe GmbH
InventorsRainer Thuering, Guenter Hagemann
Life of this patent
Estimating the term…
Abstract
A device for measuring a fuel flow in a test stand comprises a measuring module (10) for measuring a fuel flow guided through the measuring module (10) as well as a conditioning module (11) arranged downstream of the measuring module (10) for conditioning the fuel. Moreover, a verification module (19) is provided downstream of the measuring module (10) for checking the measuring precision of the measuring module (10). The fuel may be guided optionally to the conditioning module (11) or to the verification module (19). The verification module (19) is an integral part of the device may have an injector (26) as a dosing unit for extracting an exactly defined reference fuel quantity.
Claims19
A device for measuring a fuel flow, the device comprising:
- a measuring module operable to measure a fuel flow guided through the measuring module;
- a conditioning module downstream of the measuring module and operable to condition the fuel;
- a verification module downstream of the measuring module and operable to check the measuring precision of the measuring module, the verification module installed firmly and permanently as an integral part of the device and connected with the measuring module such that the fuel can be guided from the measuring module downstream to the verification module;
- a main pipe for guiding the fuel from the measuring module to the conditioning module;
- and
- a secondary pipe branching off to the verification module from the main pipe at a branching point,
- wherein the verification module has a dosing unit with a fuel injector unit operable to extract an exactly defined quantity of fuel serving as a reference fuel quantity,
- wherein the measurement fuel quantity determined by the measuring module and the reference fuel quantity determined by the dosing unit are comparable in order to determine a measuring precision of the measuring module.
A method for checking a calibration status of a device comprising a measuring module operable to measure a fuel flow guided through the measuring module, a conditioning module downstream of the measuring module and operable to condition the fuel, a verification module downstream of the measuring module and operable to check the measuring precision of the measuring module, the verification module installed firmly and permanently as an integral part of the device and connected with the measuring module such that the fuel can be guided from the measuring module downstream to the verification module, a main pipe for guiding the fuel from the measuring module to the conditioning module is disposed between the measuring module and the conditioning module, and a secondary pipe branching off to the verification module from the main pipe at a branching point, wherein the verification module has a dosing unit with a fuel injector unit operable to extract an exactly defined quantity of fuel serving as a reference fuel quantity, wherein the measurement fuel quantity determined by the measuring module and the reference fuel quantity determined by the dosing unit are comparable, in order to determine a measuring precision of the measuring module, the method comprising:
- extracting an exactly defined reference fuel quantity from the main pipe between the measuring module and the conditioning module;
- measuring, by the measuring module, a fuel quantity flowing through the measuring module, which flow of the fuel quantity is caused when the reference fuel quantity is extracted;
- and
- comparing the reference fuel quantity with the measurement fuel quantity and determining a precision of the measuring values generated by the measuring module based on a deviation between the measuring fuel quantity and the reference fuel quantity.
A method for determining a fuel type by a device comprising a measuring module operable to measure a fuel flow guided through the measuring module, a conditioning module downstream of the measuring module and operable to condition the fuel, a verification module downstream of the measuring module and operable to check the measuring precision of the measuring module, the verification module installed firmly and permanently as an integral part of the device and connected with the measuring module such that the fuel can be guided from the measuring module downstream to the verification module, a main pipe for guiding the fuel from the measuring module to the conditioning module is disposed between the measuring module and the conditioning module, and a secondary pipe branching off to the verification module from the main pipe at a branching point, wherein the verification module has a dosing unit with a fuel injector unit operable to extract an exactly defined quantity of fuel serving as a reference fuel quantity, wherein the measurement fuel quantity determined by the measuring module and the reference fuel quantity determined by the dosing unit are comparable, in order to determine a measuring precision of the measuring module, the method comprising:
- determining a fuel quantity forwarded by the dosing unit;
- determining a pressure difference between an inlet and an outlet of the dosing unit;
- determining the temperature of the fuel;
- determining an opening time of the dosing unit;
- providing a parameter characteristic diagram of the dosing unit;
- deducing a viscosity of the fuel based on the fuel quantity, the pressure difference, the temperature, the opening time, and the parameter characteristic diagram;
- and
- determining the fuel type according to the viscosity.
Dependencies are inferred from the claim text.