Measuring and testing – Vehicle drive train – Rear end
Patent
1993-04-01
1995-03-28
Williams, Hezron E.
Measuring and testing
Vehicle drive train
Rear end
G01M 1500
Patent
active
054006481
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention refers to a method of determining the course of a varying internal pressure in a cylinder of a piston engine, particularly an internal combustion engine of the piston type, as well as a device for the carrying out of the method.
Upon the inspection and adjustment of piston engines, particularly internal combustion engines of the piston type, a knowledge of the variation with time of the internal pressure over a revolution of the crank shaft is of essential importance both for the development of such piston engines and for their routine inspection and/or control.
In order to determine this variation of the internal pressure, measurement sensors arranged generally within the cylinder were heretofore necessary, this representing an expensive solution since these measurement sensors are subjected to the entire combustion pressure and the entire combustion temperature. The cost of such measurement sensors would be too great in series production, so that measurement sensors arranged fixed in position in the inside of the cylinder are used only in special cases.
From U.S. Pat. No. 4,109,518, it is furthermore known to fasten an injection nozzle acted on by the internal pressure by holding means into which a force measurement cell is inserted. The force signal supplied by the force measurement cell is in this connection substantially proportional to the internal pressure, but this solution can be used only in the case of certain types of manufacture and attachment of the injection nozzles and it is necessary to use a firmly attached force measurement cell for each cylinder of the internal combustion engine, which results in considerable expense.
Measurements of the variation with time of the internal pressure, however, provide valuable information for the adjustment and testing or maintenance of internal combustion engines and also in the routine operation of internal combustion engines with electronic control, which information was heretofore not available in many cases due to the high expense.
The object of the present invention is to provide a method and a device of the aforementioned type which, while of simple construction and low cost, permits a determination of the course of the varying internal pressure in a cylinder of a piston engine within the time domain of the combustion of interest.
SUMMARY OF THE INVENTION
By the development of the method and device in accordance with the invention an easy determination of the course of the varying internal pressure upon the routine operation of the piston engine is possible since the transfer function between the internal pressure and the acceleration, velocity, or displacement signal need be determined only once and this transfer function can then be used, in combination with the acceleration, velocity, or displacement signal, for the routine determination of the variation of the internal pressure within the crank angle range of the combustion.
Particularly in series piston engines, it can be assumed that this transfer function is, in good approximation, the same for all piston engines of a manufacturing series, so that it need be determined only once on one piston engine of the series.
In routine operation, upon the adjustment, maintenance and control of these piston engines, it is then sufficient to detect the acceleration, velocity or displacement signal on the outside of the cylinder by means of measurement sensors which operate either without contact or in direct contact with the cylinder.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be explained in further detail below on basis of embodiments shown in the drawing.
In the drawing:
FIG. 1 shows an embodiment of the device for the carrying out of the method for the determination of the transfer function;
FIG. 2 shows an embodiment of the device for deriving the signal representing the internal pressure from the acceleration, velocity or displacement measurement-sensor signals;
FIG. 3 shows an embodiment serving to explain the embodiments of the co
REFERENCES:
patent: 2810517 (1957-10-01), Wright
patent: 3978719 (1976-09-01), Hadden et al.
patent: 4109518 (1978-08-01), Dooley et al.
patent: 4525781 (1985-06-01), Konomi et al.
patent: 4606312 (1986-08-01), Nakano et al.
patent: 4860707 (1989-08-01), Ohata
Automotive Engineering, Jul. 1977, vol. 85, No. 7, Cylinder Pressures Studied On-Line, pp. 53-55.
Forschungsinstitut fur Kraftfahrwesen
Olsen James M.
Williams Hezron E.
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