Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1992-01-08
1995-01-10
DePumpo, Daniel G.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277235B, 277901, 73 35, 123425, F16J 1532
Patent
active
053800141
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a cylinder head gasket for sealing the sealing gap between the engine block and the cylinder head of a multi-cylinder internal combustion engine comprising a sealing plate with several combustion chamber orifices, combustion chamber sealing elements at the edges of the sealing plate which surround the combustion chamber orifices and a sensor element for detecting sealing gap movements.
When hereinabove and hereinbelow reference is made to combustion chamber sealing elements, so-called combustion chamber borders are also to be understood by these, i.e., ring-shaped sheet metal elements of L- or C-shaped cross section which border the edges of the sealing plate surrounding the combustion chamber orifices.
Electronic means are used increasingly for the controlling, regulating and monitoring of reciprocating internal combustion engines. Owing to the use of less and less expensive microprocessors, the total cost of the control and/or regulating and/or monitoring circuits is essentially determined by the cost of the sensors. As the cylinder head gasket is directly exposed to the influence of the combustion process in a reciprocating internal combustion engine, it is the ideal location for placing sensors for determining the operating parameters of the internal combustion engine for the use of sensors designed as separate components often fails for cost and space reasons as is, for example, the case with the restricted installation possibilities in a 4-valve engine.
There is known from DE-OS 2 917 406 (FIG. 1 in conjunction with claims 1 and 2) a cylinder head gasket with a sensor integrated in the sealing plate for detecting the oscillations which occur with knocking combustion. The actual sensor is in the form of an electric resistance section consisting of carbon powder and is arranged in a cavity located inside the soft material essentially forming the sealing plate in the immediate vicinity of a cylinder head screw. The sensor thus operates according to the principle of the known carbon microphone and registers the pressure which prevails at its location in the sealing gap and changes with respect to time.
Purposeful monitoring and/or control and/or regulation of the engine which is capable of meeting today's requirements should, however, enable cylinder-selective detection of the operating parameters so that, for example, the combustion process can be separately monitored for each individual cylinder--it is quite possible that knocking combustion will occur in one of the cylinders but not in the other cylinders (owing to, for example, the different cooling conditions of the cylinders and deposits in the combustion chambers). The same applies to so-called misfirings as a result of, for example, failure of a spark plug, to pre-ignitions, to retarded combustion or to the changing of the injection behavior in diesel engines. It has, however, been shown that cylinder-selective detection of certain operating data is not possible with the sensor means known from DE-OS 2 917 406.
There is known from DE-OS 3 006 603 a cylinder head gasket with temperature sensors integrated in its sealing plate. The purpose of the temperature sensors is to detect a knocking combustion process. This prior art discloses two basically different variants: In a first group of embodiments of the known cylinder head gasket (see FIGS. 2, 3, 5 to 7 and 9) the sealing plate has a combustion chamber border for each combustion chamber orifice, and the temperature sensors are arranged within these combustion chamber borders. If on account of the inability of a temperature sensor to detect a knocking combustion process which does not occur constantly, the temperature sensors in this known cylinder head gasket were replaced by sensors suitable for detecting sealing gap movements, these would be exposed to much too high temperatures because of their arrangement within the combustion chamber border. Furthermore, such a solution could not be implemented at least with the present state of the art for space reasons, and, finall
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Stecher, ATZ 70 (German document) 1968, pp. 209-212.
DePumpo Daniel G.
Elring Dichtungswerke GmbH
Timmer Edward J.
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