Measuring and testing – Test stand – For engine
Patent
1993-06-07
1995-07-04
Raevis, Robert
Measuring and testing
Test stand
For engine
G01M 1500
Patent
active
054289912
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a process for adapting the mechanical tolerances of a transmitter wheel.
More particularly, it relates to a process for adapting mechanical tolerances of a transmitter wheel with a number of approximately equidistant markings sensed by a pickup which supplies a pulse train whose time interval is measured and stored.
To detect a determined position of a shaft, e.g. the crankshaft or the camshaft of an internal combustion engine, it is known to fasten a transmitter disk having markings on its surface on the respective shaft and to sense the markings with a stationary pickup. The markings passing by the pickup, e.g. an inductive pickup, induce voltage pulses which are processed in a subsequent evaluating circuit or in a subsequent control device, the rate of rotation of the shaft being calculated from the time intervals between the voltage pulses.
A device which determines the rate of rotation and angular position of the shaft in this way is known e.g. from EP 0 188 433. A transmitter wheel with a plurality of angle marks is sensed and the obtained voltage is converted into a square-wave voltage. Information on the rate of rotation is obtained from the time intervals between identical angle mark flanks. This known device has the disadvantage either that the angle marks must be executed very exactly so that the intervals between identical angle mark flanks are very precise, or that the rate of rotation can only be determined in an inexact manner.
In the first case, a very expensive and cost-intensive production is required. In the second case, the measurement of the rate of rotation is so inexact that it cannot be used for modern internal combustion engines.
A method and a device for measuring an angle is known from DE-OS 30 18 496 in which a transmitter wheel connected with a rotating shaft and having a plurality of markings is sensed by a pickup. To increase accuracy, the intervals between the individual angle marks are first measured out in a calibrating run; these measured values are then stored and included in a subsequent evaluating process for measuring an angle.
However, the known device and process do not show that it is possible to determine the rate of rotation of the shaft exactly from the time interval between identical angle mark flanks. Also, the known device and the known process have the disadvantage that a calibrating run must be carried out prior to operation and a checking of or adaptation to changed parameters, if required, can no longer be effected during operation.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a process for adapting mechanical tolerances of a pick-up wheel, which avoids the disadvantages of the prior art.
In keeping with these objects and with others which will become apparent hereinafter, one feature of the present invention resides, briefly stated, in a process for adapting mechanical tolerances of a transmitter wheel, in accordance with which the transmitter wheel is connected with a rotating shaft of an internal combustion engine, a check is carried out as to whether or not the internal combustion engine is in thrust operation, and the second and following time intervals are placed in relation to the first time interval when thrust operation is detected.
When the process is performed in accordance with the present invention, it has the advantage over the prior art that adaptation of the transmitter wheel tolerances can also be effected during operation under conditions which ensure that no changes or fluctuations in the rate of rotation occur, which is generally the case in thrust operation.
By checking the adaptation values it can be established at any time how far the adaptation has already progressed. By filtering the correction values and filtering the adaptation values, a particularly exact adaptation can be carried out.
It is particularly advantageous that the rate of rotation can be determined in a very precise manner after adaptation from the individua
REFERENCES:
patent: 4445087 (1984-04-01), Mehnert
patent: 4569027 (1986-02-01), Nakano et al.
patent: 4972333 (1990-11-01), Isikawa
patent: 5117681 (1992-06-01), Dosdall et al.
patent: 5200899 (1993-04-01), Ribbens et al.
Kantschar Anton
Klenk Martin
Mueller Werner
Wimmer Wolfgang
Raevis Robert
Robert & Bosch GmbH
Striker Michael J.
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