Measuring and testing – Test stand – For engine
Patent
1989-01-25
1990-09-25
Raevis, Robert R.
Measuring and testing
Test stand
For engine
G01M 1500
Patent
active
049585150
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a spark plug with a measurement device. In a known spark plug of this kind a pressure measurement device, which is connected with the combustion chamber, is arranged within the housing of the spark plug. However, it can determine only the combustion gas pressure. Occurring accelerations must be compensated for, since they falsify the measurement signals. In addition, it is known to arrange sensors at the spark plug for determining the knocking. However, these sensors are designed in such a way that they pick up narrow-band vibrations and transmit corresponding electric signals. These sensors must selectively measure the narrow range in which knocking occurs. In this case, also, only the sequence of the combustion process is monitored. The movement of mechanical parts such as valves, pistons, etc. cannot be determined. Their movement was previously measured individually by sensors arranged at a respective mechanical part.
SUMMARY OF THE INVENTION
The object of the invention is to provide a spark plug with a sensor that only measures the movements resulting from the combustion and the mechanically moved parts of the engine such as e.g. pistons, valves and bearing play. The object of the invention is achieved by providing a spark plug with a movement sensor located in the upsetting and heat-shrink area of the spark plug housing. The processes in the combustion chamber itself are not determined. Whereas previous devices determined according to the present invention the processes in the combustion chamber, the sensor monitors the movement of the mechanical parts. The vibrations and accelerations, respectively, which result from their movement, are transmitted to the engine block and determined by the sensor. It is known which parts vibrate in which frequency ranges. If the received signals change, then conclusions may be drawn about the operating state of the internal combustion engine. A large range may be detected by means of a wide-band sensor, so that a large number of parts are monitored. It is possible to draw conclusions about the monitored part and its change from the frequency of the received signals. The use of a wide-band vibration receiver (up to approximately 200 kHz) enables a high time resolution of the individual received signals. The operating state and the functioning of the engine can be monitored continuously during driving as well as during checks in the workshop. The sensor is arranged securely in a bore in the housing of the spark plug, so that it has a certain resistance against shaking, i.e. it cannot change its position during stresses occurring during operation and can accordingly not bring about faulty measurements. Because of the asymmetrical arrangement of the central bore of the spark plug with the insulating body, no external structural changes in the housing of the spark plug are necessary, so that the spark plug can easily be used in previous arrangements. Accordingly, there is sufficient constructional space for the sensor in the housing of the spark plug. When the construction remains constant, the engine can only be re-equipped by means of exchanging the spark plug with or without the sensor. Each part no longer needs its own sensor which, in addition, is not exchangeable.
The invention as to its construction so as its method of operation, together with additional objects and advantages thereof, will be best understood from the following detailed description of the preferred embodiment with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
The single FIGURE shows a longitudinal sectional view of a spark plug according to the present invention with a built-in sensor.
DESCRIPTION OF THE PREFERRED EMBODIMENT
An eccentric longitudinal bore hole 12 is constructed in the housing 10 of a spark plug 11. The housing 10 can be screwed into an engine block by means of an external thread 13 in a conventional known manner. The housing 10 ends in a ground electrode 14 at its end of the combustion chambe
REFERENCES:
patent: 903090 (1908-11-01), Hopkins
patent: 1907415 (1933-05-01), Carpenter et al.
patent: 3020763 (1962-02-01), Davis
patent: 3703825 (1972-11-01), Merlo
patent: 3783681 (1974-01-01), Hirt et al.
patent: 4169388 (1979-10-01), Teitelbaum et al.
patent: 4730484 (1988-03-01), Olschefski
Bruggen Gerhard
Keiper Winfried
Steinke Leo
Raevis Robert R.
Robert & Bosch GmbH
Striker Michael J.
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