Continuously variable transmission
First Claim
1. A method of controlling a continuously variable transmission (CVT) having a plurality of traction planets with tiltable axles of rotation, the method comprising the steps of:
- providing a control reference indicative of a desired operating condition of the CVT;
sensing a current operating condition of the CVT;
comparing the desired operating condition with the current operating condition thereby generating a control error; and
imparting a skew angle to each of the tiltable axles, the skew angle based at least in part on the control error, wherein sensing a current operating condition comprises providing an axial position of a traction sun, said axial position being indicative of the current operating condition of the CVT.
13 Assignments
0 Petitions
Accused Products
Abstract
Inventions are directed to components, subassemblies, systems, and/or methods for continuously variable transmissions (CVT). In one aspect, a control system is adapted to facilitate a change in the ratio of a CVT. A control system includes a control reference nut coupled to a feedback cam and operably coupled to a skew cam. In some cases, the skew cam is configured to interact with carrier plates of a CVT. Various inventive feedback cams and skew cams can be used to facilitate shifting the ratio of a CVT. In some transmissions described, the planet subassemblies include legs configured to cooperate with the carrier plates. In some cases, a neutralizer assembly is operably coupled to the carrier plates. A shift cam and a traction sun are adapted to cooperate with other components of the CVT to support operation and/or functionality of the CVT. Among other things, shift control interfaces for a CVT are described.
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Citations
20 Claims
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1. A method of controlling a continuously variable transmission (CVT) having a plurality of traction planets with tiltable axles of rotation, the method comprising the steps of:
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providing a control reference indicative of a desired operating condition of the CVT; sensing a current operating condition of the CVT; comparing the desired operating condition with the current operating condition thereby generating a control error; and imparting a skew angle to each of the tiltable axles, the skew angle based at least in part on the control error, wherein sensing a current operating condition comprises providing an axial position of a traction sun, said axial position being indicative of the current operating condition of the CVT. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of controlling a continuously variable transmission (CVT) having a plurality of traction planets with tiltable axles of rotation, the method comprising the steps of:
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providing a control reference indicative of a desired operating condition of the CVT; sensing a current operating condition of the CVT; comparing the desired operating condition with the current operating condition thereby generating a control error; and imparting a skew angle to each of the tiltable axles, the skew angle based at least in part on the control error, wherein imparting a skew angle comprises imparting a carrier plate angle to a carrier plate of the CVT. - View Dependent Claims (15, 16)
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17. A method of controlling a continuously variable transmission (CVT) having a plurality of traction planets with tiltable axles of rotation, the method comprising the steps of:
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providing a control reference indicative of a desired operating condition of the CVT; sensing a current operating condition of the CVT; comparing the desired operating condition with the current operating condition thereby generating a control error; and imparting a skew angle to each of the tiltable axles, the skew angle based at least in part on the control error, wherein sensing a current operating condition comprises determining the magnitude of an axial force exerted on a traction sun, wherein the magnitude of the force is indicative of the current operating condition of the CVT. - View Dependent Claims (18, 19, 20)
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Specification