Measuring and testing – Steam or water operated engine; related engine system or...
Patent
1982-09-30
1985-02-12
Caldwell, Sr., John W.
Measuring and testing
Steam or water operated engine; related engine system or...
G01F 900
Patent
active
044983344
DESCRIPTION:
BRIEF SUMMARY
STATE OF THE ART
The invention is based on an apparatus for measuring fuel consumption in an internal combustion engine. Present-day fuel pumps, because of their dimensions, require a medium for carrying away heat. This purpose is served by the fuel to be pumped, which is thus heated up during the course of its circulation through the pump. In order to prevent gas bubbles in the fuel caused by excessive heating of the fuel, it is necessary to flush the pump with a quantity of fuel greater than what must be delivered to the engine. However, given this increased supply quantity of the pump, the problem arises of precise measurement of fuel consumption, because the quantity actually consumed is the supply quantity minus the recirculated quantity.
A known apparatus for measuring the consumption of fuel by an internal combustion engine provides a flow quantity measuring device in the fuel line from a main tank to an auxiliary tank; the fuel pump then pumps the fuel from this auxiliary tank to the engine and the flushing quantity is returned to the auxiliary tank. The auxiliary tank, in combination with the fuel supply pump and the return flow line, thus comprises a circulatory system for fuel, and the flow meter in the connecting line between the main tank and the auxiliary tank detects solely the quantity of fuel actually consumed.
This known apparatus for measuring fuel consumption necessitates considerable additional expense, because of the auxiliary tank; it furthermore represents a safety risk since fuel must be stored continuously in this auxiliary tank.
ADVANTAGES OF THE INVENTION
In the apparatus according to the invention for measuring fuel consumption in an internal combustion engine, the additional expense for structural components is kept within limits, and the safety risk is negligible. The apparatus is simple and thus not very vulnerable to malfunctions.
DRAWING
One exemplary embodiment of the invention is shown in the drawing and will be described and explained in greater detail below.
FIG. 1 shows the basic structure of the apparatus for measuring fuel consumption, and
FIG. 2 is a pulse diagram relating to the individual elements of the apparatus.
DESCRIPTION OF THE EXEMPLARY EMBODIMENT
The invention relates to an apparatus for measuring fuel consumption in an internal combustion engine having self-ignition. The fuel tank is marked 10, a flow quantity measuring unit is marked 11, a fuel filter is marked 12, and the fuel pump is marked 13. This fuel pump has an inflow connection 14, as well as a high-pressure connection 15 and finally a return flow connection 16. The pump 13 communicates in a known manner with an injection nozzle via the high-pressure connection 15.
Located in a return flow line 17 which begins at the return flow connection 16 is an electromagnetically actuatable 3/2-way valve 18, the output 19 of which is normally switched through and is coupled with a tank return flow line 20; the second output connection of the valve 18 is coupled via a special line segment 21 with the connecting point of the flow meter 11 and the filter 12.
The exciter winding of the valve 18 receives trigger signals from a timing element 25, which is triggered in turn by a time signal generator circuit 26. In the simplest case, the timing element 25 comprises a monostable multivibrator. The time signal generator circuit 26 further communicates with a consumption calculating device 27, which additionally receives signals from flow quantity meter 11. The consumption calculating device 27, at specified times, processes the output signal of the flow meter 11 and causes the consumption value to be indicated in a viewing device or instrument 28 in a manner associated with either elapsed time or distance travelled.
FIG. 2a shows the trigger signal for the exciter winding of the valve 18. In FIG. 2b, a signal train is shown; during the course of the pulse duration of this train, the output signal of the flow meter 11 is processed in order to determine the fuel consumption.
From FIG. 1 it will be seen that
REFERENCES:
patent: 3973536 (1976-08-01), Zelders
patent: 4141243 (1979-02-01), Van Tassel
patent: 4253330 (1981-03-01), Kato
Caldwell Sr. John W.
Greigg Edwin E.
Harding E. G.
Robert & Bosch GmbH
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