Measuring and testing – Simulating operating condition – Marine
Patent
1986-07-02
1988-01-12
Myracle, Jerry W.
Measuring and testing
Simulating operating condition
Marine
36443105, G01M 1500
Patent
active
047182725
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is based on an adaptation method for a position detection member, particularly for the detection of positions of a movable control part in a motor vehicle, of the type which includes a plurality of position receivers which scan a plurality of overlapping path areas with different resolutions. Potentiometers, which likewise comprise overlapping potentiometer paths with different resolutions, are known from the German Utility Model No. 71 20 684, as well as from DE-OS No. 34 33 585, for use as throttle valve position indicators. It is possible with this arrangement to work in the region of small opening angles with a very high resolution and in the region of larger opening angles with a smaller resolution.
An electrically controlled, intermittently working fuel injection system with an injection signal generation which is based on the speed of rotation and the throttle valve position is known from DE-OS No. 24 42 373. The throttle valve position is detected by means of a potentiometer. In regard to an optimal fuel apportioning, it is necessary to detect the throttle valve position very accurately in the region of relatively small throttle valve opening angles, i.e. in the lower load region. This requires an increased resolution in the lower load region in comparison to higher load regions.
When using a potentiometer with overlapping path regions, wherein the path region corresponding to the small opening angles has a higher resolution, a sufficient accuracy for detecting, e.g., the throttle valve position can be achieved in principle, but it has proven very difficult to assign the overlapping path regions to one another accurately enough so that an allowed error of 0.2.degree. is not exceeded. For reasons relating to manufacturing, particularly in mass production, however, no greater accuracy than .+-.1.degree. can be achieved with justifiable expenditure.
OBJECT AND ADVANTAGES OF THE INVENTION
Therefore, it is the object of the invention to show a method by means of which a very accurate assignment of the measurment signals of the various path regions to one another can be achieved, and too high manufacturing tolerances are avoided.
This object is met in an advantageous manner in that adaptation is effected in the overlapping path areas, wherein a correction value (K.sub.i) is formed and the measured values (M2) of the path area to be adapted are added to it, and in that a new correction value (K.sub.i+l) is formed in each instance from the difference value (D) between the corrected measured values (W2) of the path area to be adapted and a desired value (T(W1)) for the path area, which desired value (T(W1)) is given by means of a stored assignment table of measured values (W1) of another path area forming a measurement basis. Subsequent displacements, e.g. due to aging, can also still be compensated and do not lead to errors in the measuring results. In comparison to the manufacturing tolerances, a very high accuracy and resolution are achieved.
Advantageous further developments and improvements of the adaptation method are possible by means of the features given in the subclaims. Thus, it is guaranteed, in particular, that temporarily occurring interference signals or displacements due to shaking have no influence on the correction value for the adaptation, since a new correction value is only formed, after a predetermined quantity of operating cycles, if the deviation always has the same direction.
BRIEF DESCRIPTION OF THE DRAWING
Embodiment examples of the invention are shown in the drawing and are described and explained in more detail in the following.
FIG. 1 shows a schematic illustration of an electronically controlled injection system in which the throttle valve position and the speed of rotation are processed as the most important operating characteristic values,
FIG. 2 shows a position detection member with a plurality of individual paths and individual regions, respectively, proceeding from a common starting point,
FIG. 3 shows another example of a position detectio
REFERENCES:
patent: 4526042 (1985-07-01), Yamazoe et al.
patent: 4586403 (1986-05-01), Lee et al.
Myracle Jerry W.
Robert & Bosch GmbH
Striker Michael J.
LandOfFree
Adaptation method for a position detection member, particularly does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Adaptation method for a position detection member, particularly , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Adaptation method for a position detection member, particularly will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-914692