Measuring and testing – Vehicle drive train – Rear end
Patent
1992-01-16
1993-07-20
Myracle, Jerry W.
Measuring and testing
Vehicle drive train
Rear end
73714, 374 29, 374144, G01M 1500
Patent
active
052283330
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a sensor for measuring both the combustion pressure and the heat flow in the combustion chamber of an internal combustion engine, in particular, for motor vehicles. In addition to the combustion pressure, the heat flow through the engine block and the gas temperature in the combustion chamber are also of interest as a further thermodynamic variable. These variables are to be detected. Since the possibility of making additional bores in the engine block for additional sensors is highly restricted, a technical procedure is sought according to the teaching solving the present problem. The technical teaching indicated in the present invention solves the abovementioned problem. The invention is based on the object of integrating the heat-flow sensor in the provided pressure sensor which projects into the combustion chamber of the engine. The invention relates, but not in a restrictive manner, especially to pressure sensors as disclosed in the German Offenlegungsschriften DE-OS 3 714 131 and 3 727 221.
These known pressure sensors have as components which are of particular interest here a diaphragm whose one side delimits the combustion chamber of the engine and on whose opposite diaphragm surface a tappet or the like rests so that the pressure prevailing on the other side of the diaphragm can be transmitted as a force from this diaphragm surface to a sensor element of the pressure sensor. This sensor element is particularly a piezoelectric sensor, preferably in the form of a plate to be bent or a tube of piezo material to be loaded in the axial direction with the pressure. In particular piezo ceramic such as lead zirconate titanate and the like are used as piezoelectric material. This material is cheap and technically sophisticated.
SUMMARY OF THE INVENTION
According to the invention, it is provided that the thermo sensor of the present invention, be attached on the, with respect to the pressure sensor, internal diaphragm surface, specifically with good heat contact with the diaphragm. By this means this temperature sensor is subjected virtually directly to the heat of the combustion gases which flow around the, again with respect to the pressure sensor, opposite external diaphragm surface.
BRIEF DESCRIPTION OF THE DRAWINGS
The features of the present invention which are believed to be novel, are set forth with particularity in the appended claims. The invention, together with further objects and advantages, may best be understood by reference to the following description taken in conjunction with the accompanying drawing, and in which:
The single FIG. is a cross-sectional view of the sensor of the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The heat-flow sensor according to the invention consists of two temperature sensors, as is shown by the enclosed figure of a particularly preferred integrated embodiment of the invention. Only the basic form of this pressure sensor is illustrated in this figure and the diaphragm is designated by 11, the pressure sensor housing to be inserted into the engine block by 12, the piezoelectric tube by 13 and the support point of the pressure sensor by 14. The one pole for the electric pressure sensor signal is designated by 15, the support point 14 being the second pole in the present embodiment. Connection bushings for the feed lines to the heat-flow sensor 21 provided according to the invention are designated by 16 and 17.
Additional details as to how a heat-flow sensor in itself can be designed in practice and which details are important then, are disclosed in DE-OS 2 064 395. In particular, more detailed information relating to special embodiments of the temperature sensors or of the thermoelements and their circuitry can be found in this publication.
As can be seen from the figure, this heat-flow sensor 21 is coupled with its one plate 22 closely in terms of temperature to the diaphragm 11. The second plate 24 of the temperature sensor is preferably coupled thermally to a component which ha
REFERENCES:
patent: 4299117 (1981-11-01), Andrews et al.
patent: 4936147 (1990-06-01), EerNisse et al.
Kleinschmidt Peter
Meixner Hans
Mock Randolf
Winter Hans
Myracle Jerry W.
Siemens Aktiengesellschaft
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