Measuring and testing – Simulating operating condition – Marine
Reexamination Certificate
1998-12-04
2001-10-16
Fuller, Benjamin R. (Department: 2855)
Measuring and testing
Simulating operating condition
Marine
C073S113010, C073S114020
Reexamination Certificate
active
06301958
ABSTRACT:
The invention involves a process for determining the fuel consumption or the operating status in or of combustion engines having a fuel injection pump based on the characteristics of the generic concept of patent claim
1
.
In the processes, which have been used so far and are thus previously known, the pulses sent from the measuring devices were added up, possibly adjusted and converted, and then the sum of these pulses was called in to count and display the fuel consumption. If in order to check the measurement accuracy in succession, the effective content of the fuel supply container was compared with the values obtained by the measurement, then some quite considerable deviations had to be determined, which made the functionality of this type of measurement appear questionable. Such deviations appear in the following cases:
For diesel generators and for vehicle motors in that the tank content and the measurement value do not agree.
For diesel generators during acceptance tests and installation and start-up, in that in the fuel system for the time of the testing, a container is integrated with which the fuel quantity is weighed. Together with the density of the fuel, the consumption is then checked relative to the assured property. In this process, deviations of the throughput meter also accrue.
In testing stands, the consumption values deviate so greatly from the theoretically determined values, that the result of the consumption measurement is simply implausible.
Intensive and long term tests and studies have shown that for high-performance combustion engines, especially for diesel assemblies, whose fuel injector pumps are made as piston pumps, because of the constructive conditions and because of the operational methods of such a piston pump, pressure waves and pressure oscillations of considerable dimensions can be generated in the fuel lines. These pressure waves and oscillations are sometimes so considerable and act in such a manner that the fuel changes the flow direction prescribed for it, i.e. flows back, so to speak, in the aforementioned lines as a function of the frequency of these waves and oscillations, even if only for a short time. The fuel quantities involved here are, for high-performance assemblies, not to be ignored as seen over the entire operating time of the assembly, if this involves determining and recording the fuel consumption of the assembly as exactly as possible. Furthermore, from the actual fuel consumption as well as the flow direction and the frequency of the change in the flow direction, conclusions can be drawn about the operating status of the combustion engine.
The purpose and goal of the invention is thus to further develop the process in such a manner that measurement results involving the fuel consumption can be obtained that are as exact as possible and take into account the conditions as much as possible. In order to achieve this purpose, the invention proposes those measures that are the content and object of the characterizing part of patent claim
1
. The occurrence of pressure pulsations in the low pressure system is described in the report “Injector pump cavitation, Project No. 558, Volume 629, 1996, Frankfurt am Main” of the Combustion Engine Research Organization e.V. (FVV). The subject of the report is the development of dampers to prevent damages to the injector pump caused by cavitation. The research work does not recognize the effect of the flow reversal.
Functionally, a screw spindle displacement volume meter having at least two sensors offset from each other, is used as the measuring device. Screw spindle displacement volume meters of this type are, for example, known from the patent AT 400 766 B. However, a type of screw spindle displacement volume meters could also be used which uses a serrated or tooth lock washer as the pulse-emitting device, as is known in connection with the patent EP 0 572 621 B1, where in this case two sensors offset at angles on the perimeter of the housing are provided per pulse emitting device, so that temporally offset pulse sequences are obtained, from the progression of which the respective flow direction can be derived.
REFERENCES:
patent: 4459943 (1984-07-01), Goodman
patent: 5205161 (1993-04-01), Erwin
patent: 5738071 (1998-04-01), Smith, Jr. et al.
patent: 5740782 (1998-04-01), Lowi, Jr.
patent: 400 766 B (1996-03-01), None
patent: 0 572 621 B1 (1996-09-01), None
Feierle Karl-Heinz
Flauger Thomas
Grabher Reinhard
Baker & Daniels
Fuller Benjamin R.
Kräutler Gesellschaft mbH & Co.
Stevens Maurice
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