Device and method for adjusting the ratio of transmission in a CVT
First Claim
1. An arrangement for adjusting the transmission ratio of a continuously variable belt transmission having a drive end and an output end, each of said ends having at least one axially displaceable element which has essentially the form of a conical disc, the arrangement comprising:
- sensor means for detecting an rpm signal (Np) representing the rotational movement of said drive end or of the output end and for detecting a displacement signal (Xp), which represents the axial displacement of said at least one element which can be axially displaced;
means for adjusting the transmission ratio with the adjustment taking place at least in dependence upon the detected displacement signal (Xp); and
,said adjusting means for adjusting said transmission ratio being so configured that;
(a) a corrective value (offset) is determined in dependence upon a displacement signal, which is detected when a pregivable status of the transmission is present; and
,(b) the detected displacement signal (Xp) and/or quantities (Xp '"'"') derived from the detected displacement signal are modified in dependence upon the determined corrective value (offset).
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Accused Products
Abstract
The invention proceeds from an arrangement or a method for adjusting the transmission ratio of a continuously variable belt transmission having a drive end and an output end. The drive end and the output end have at least one axially displaceable element which has essentially the form of a conical disc. Via sensor means, an rpm signal is detected, which represents the rotational movement of the drive end or the output end, and, on the other hand, a displacement signal is detected which represents the axial displacement of at least one of the axially displaceable elements. The essence of the invention is that means for adjusting the transmission ratio are provided with the aid of which the adjustment takes place at least in dependence upon the detected displacement signal. An advantage of the invention is that, in this way, the possibility is provided to save one rpm sensor. Furthermore, and as shown in the course of the description in greater detail, the total transmission ratio adjustment is substantially independent of the engine load or of the drive torque acting in the drive train.
11 Citations
8 Claims
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1. An arrangement for adjusting the transmission ratio of a continuously variable belt transmission having a drive end and an output end, each of said ends having at least one axially displaceable element which has essentially the form of a conical disc, the arrangement comprising:
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sensor means for detecting an rpm signal (Np) representing the rotational movement of said drive end or of the output end and for detecting a displacement signal (Xp), which represents the axial displacement of said at least one element which can be axially displaced; means for adjusting the transmission ratio with the adjustment taking place at least in dependence upon the detected displacement signal (Xp); and
,said adjusting means for adjusting said transmission ratio being so configured that; (a) a corrective value (offset) is determined in dependence upon a displacement signal, which is detected when a pregivable status of the transmission is present; and
,(b) the detected displacement signal (Xp) and/or quantities (Xp '"'"') derived from the detected displacement signal are modified in dependence upon the determined corrective value (offset). - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for adjusting the transmission ratio of a continuously adjustable belt transmission having a drive end and an output end which have at least one axially displaceable element, which has essentially the form of a conical disc for which an rpm signal (Np) is detached, which represents the rotational movement of the drive end or the output end, the method comprising the steps of:
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detecting a displacement signal (Xp) which represents the axial displacement of at least one of the axially displaceable elements; causing the adjustment to take place at least in dependence upon the detected displacement signal (Xp); and
,configuring said adjusting means for adjusting said transmission ratio so that; (a) a corrective value (offset) is determined in dependence upon a displacement signal, which is detected when a pregivable status of the transmission is present; and
,(b) the detected displacement signal (Xp) and/or the quantities Xp '"'"' derived from the detected displacement signal are modified in dependence upon the determined corrective value (offset).
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Specification