Method and apparatus for controlling an automatic bicycle transmission
AssigneeShimano Inc.
InventorKazuhiro Takeda
Life of this patent
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Abstract
An apparatus for determining when to shift a bicycle chain from a first sprocket having a first number of teeth to a second sprocket having a second number of teeth comprises a memory for storing a reference value, and a processor that determines a shift value corresponding to a shift speed for shifting the chain from the first sprocket to the second sprocket by multiplying the reference value by one of the first number of teeth and the second number of teeth and dividing by the other one of the first number of teeth and the second number of teeth.
Claims42
An apparatus for determining when to shift a bicycle chain from a first sprocket having a first number of teeth to a second sprocket having a second number of teeth, comprising:
- a memory for storing a reference value;
- and
- a processor that determines a shift value corresponding to a shift speed for shifting the chain from the first sprocket to the second sprocket by multiplying the reference value by one of the first number of teeth and the second number of teeth and dividing by the other one of the first number of teeth and the second number of teeth.
An apparatus for determining when to shift a bicycle chain among a plurality of sprockets, comprising:
- a wheel rotation sensor;
- a memory for storing a table having a plurality of shift values corresponding to shift speeds, wherein a shift value SV(m) for shifting from a sprocket S(m) having T(m) teeth to a sprocket S(n) having T(n) teeth equals a reference value RV(m) multiplied by one of T(m) and T(n) and divided by the other one of T(m) and T(n);
- and
- a processor for providing a shift signal when the bicycle chain engages sprocket S(m) and a value calculated from the wheel rotation sensor passes shift value SV(m).
Dependencies are inferred from the claim text.