Patent ID: 6146297
Filing Date: 2000-11-14
Classification: B62M

Abstract:
An automatic shift control apparatus for a bicycle transmission comprising:a bicycle speed receiving mechanism for receiving a bicycle speed;a shift control mechanism for commanding downshifting of the bicycle transmission from a higher speed step to a lower speed step in response to the bicycle speed and for commanding upshifting of the bicycle transmission from the lower speed step to the higher speed step in response to the bicycle speed;a memory;a regular mode downshift table stored in the memory and including a plurality of speed step entries associated with a corresponding plurality of regular mode downshift speed entries;an upshift mode downshift table stored in the memory and including the plurality of speed step entries associated with a corresponding plurality of upshift mode downshift speed entries;an upshift mode setting mechanism for setting an upshift mode in response to the shift control mechanism commanding the bicycle transmission to shift from the lower speed step to the higher speed step;wherein the shift control mechanism accesses the upshift mode downshift table and commands the bicycle transmission to shift from the higher speed step to the lower speed step at one of the plurality of upshift mode downshift speed entries when the upshift mode setting mechanism is in the upshift mode;wherein the shift control mechanism accesses the regular mode downshift table and commands the bicycle transmission to shift from the higher speed step to the lower speed step at one of the plurality of regular mode downshift speed entries when the upshift mode setting mechanism is not in the upshift mode; andwherein the one of the plurality of upshift mode downshift speed entries is different from the one of the plurality of regular mode downshift speed entries.