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A method for automatic adjustment of a pedelec having a first assist level and a second assist level includes the following steps. The pedelec is operated at an initial assist level. A pedal torque index is measured and compared with a predetermined numeric section having an upper threshold and a lo

A method for automatic adjustment of a pedelec having a first assist level and a second assist level includes the following steps. The pedelec is operated at an initial assist level. A pedal torque index is measured and compared with a predetermined numeric section having an upper threshold and a lower threshold. If the pedal torque index is within the predetermined numeric section, the pedelec is kept in operating at the initial assist level. If the pedal torque index is lower than the lower threshold, the pedelec is adjusted to operate at the second assist level. If the pedal torque index is higher than the upper threshold, the pedelec is adjusted to operate at the first assist level. Therein, auxiliary force provided by the pedelec at the second assist level is less than auxiliary force provided by the pedelec at the first assist level.

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1. A method for automatic adjustment of a pedelec, the pedelec having a first assist level and a second assist level, auxiliary force provided by the pedelec at the second assist level being less than auxiliary force provided by the pedelec at the first assist level, the pedelec comprising a pedal,

1. A method for automatic adjustment of a pedelec, the pedelec having a first assist level and a second assist level, auxiliary force provided by the pedelec at the second assist level being less than auxiliary force provided by the pedelec at the first assist level, the pedelec comprising a pedal, the method comprising the following steps: (A) operating the pedelec at an initial assist level;(B) measuring a pedal torque index and comparing the pedal torque index with a predetermined numeric range, the predetermined numeric range being defined between an upper threshold and a lower threshold, and the upper threshold is higher than the lower threshold;(C) if the pedal torque index is within the predetermined numeric range, keeping the pedelec in operating at the initial assist level;(D) if the pedal torque index is lower than the lower threshold, adjusting the pedelec to operate at the second assist level; and(E) if the pedal torque index is higher than the upper threshold, adjusting the pedelec to operate at the first assist level. 2. The method of claim 1, before the step (A), further comprising the following steps: (1) sensing a traveling speed of the pedelec and a rotating speed of the pedal;(2) if the traveling speed or the rotating speed is equal to 0, adjusting the pedelec to operate at the first assist level and returning back to the step (1); and(3) executing the steps (A) to (E) only when both the traveling speed and the rotating speed are larger than 0. 3. The method of claim 1, wherein a rotation path of the pedal has a first position and a second position, and the step (B) comprises the following steps: (B1) detecting a pedal position of the pedal;(B2) recording a plurality of instant torque values measured during the pedal moving from the first position toward the second position, and assigning a maximum torque value among the instant torque values as the pedal torque index; and(B3) when the pedal position passes through the second position, comparing the pedal torque index with the lower threshold and passing a result of the comparing to the step (D). 4. The method of claim 3, wherein the first position being same as the second position, the maximum torque value among the instant torque values in a rotation cycle of the pedal is assigned as the pedal torque index, and the step (D) is executed once in every rotation cycle of the pedal. 5. The method of claim 1, wherein a rotation path of the pedal has a first position and a second position, and the step (B) comprises the following steps: (B1′) detecting a pedal position of the pedal;(B2′) when the pedal position is between the first position and the second position, measuring an instant torque value, assigning the instant torque value as the pedal torque index, comparing the pedal torque index with the upper threshold, and passing a result of the comparing to the step (E); and(B3′) re-detecting a pedal position of the pedal, and when the pedal position is still between the first position and the second position, returning back to the step (B2′). 6. The method of claim 1, wherein the lower threshold and the upper threshold are capable of being adjusted by a user, and an interval between the lower threshold and the upper threshold is kept to be a constant torque difference. 7. A method for automatic adjustment of a pedelec, the pedelec being capable of outputting auxiliary force at a first assist level, a second assist level and a third assist level selectively, the auxiliary force provided by the pedelec at the first assist level being larger than the auxiliary force provided by the pedelec at the second assist level, the auxiliary force provided by the pedelec at the second assist level being larger than the auxiliary force provided by the pedelec at the third assist level, a next lower level for the first assist level being the second assist level, a next lower level for the second assist level being the third assist level, the pedelec comprising a pedal, a rotation path of the pedal having a first position and a second position, the pedelec having a current assist level parameter and a predetermined numeric range, the predetermined numeric range being defined between an upper threshold and a lower threshold, the upper threshold being higher than the lower threshold, the method comprising the following steps: (A) assigning one of the first assist level and the second assist level to the current assist level parameter;(B) detecting a pedal position of the pedal;(C) when the pedal position is between the first position and the second position, (C1) measuring and recording an instant torque value;(C2) if the instant torque value is higher than the upper threshold, assigning the first assist level to the current assist level parameter; and(C3) if the instant torque value is lower than the upper threshold, maintaining the current assist level parameter; and(D) when the pedal position passes through the second position, (D1) determining a maximum torque value among a plurality of instant torque values measured and recorded during the pedal moving from the first position toward the second position;(D2) if the maximum torque value is lower than the lower threshold, adjusting the current assist level parameter to the next lower level for the assist level that is assigned to the current assist level parameter; and(D3) if the maximum torque value is higher than the lower threshold, maintaining the current assist level parameter. 8. The method of claim 7, wherein the step (C) further comprises a step (C4) returning back to the step (B), and the step (D) further comprises a step (D4) returning back to the step (B). 9. The method of claim 7, before the step (A), further comprising the following steps: (1) sensing a traveling speed of the pedelec and a rotating speed of the pedal;(2) if the traveling speed or the rotating speed is equal to 0, assigning the first assist level to the current assist level parameter and returning back to the step (1); and(3) executing the steps (A) to (D) only when both the traveling speed and the rotating speed are larger than 0. 10. A method for automatic adjustment of a pedelec, the pedelec being capable of operating at a first assist level, a second assist level and a third assist level selectively, auxiliary force provided by the pedelec at the first assist level being larger than auxiliary force provided by the pedelec at the second assist level, the auxiliary force provided by the pedelec at the second assist level being larger than auxiliary force provided by the pedelec at the third assist level, a next lower level for the first assist level being the second assist level, a next lower level for the second assist level being the third assist level, the pedelec having a pedal, a current assist level parameter, and a predetermined numeric range, the predetermined numeric range being defined between an upper threshold and a lower threshold, the upper threshold being higher than the lower threshold, the method comprising the following steps: (A) assigning one of the first assist level and the second assist level to the current assist level parameter;(B) measuring a pedal torque index;(C) comparing the pedal torque index with the upper threshold, and if the pedal torque index is higher than the upper threshold, assigning the first assist level to the current assist level parameter;(D) comparing the pedal torque index with the lower threshold, and if the pedal torque index is lower than the lower threshold, adjusting the current assist level parameter to the next lower level for the assist level that is assigned to the current assist level parameter; and(E) if the pedal torque index is higher than the lower threshold and lower than the upper threshold, maintaining the current assist level parameter. 11. The method of claim 10, a rotation path of the pedal having a first position and a second position, wherein the step (D) comprises the following steps: (D1) detecting a pedal position of the pedal; and(D2) when the pedal position passes through the second position, comparing the pedal torque index with the lower threshold. 12. The method of claim 11, wherein the step (B) comprises the following step: (B1) recording a plurality of instant torque values measured during the pedal moving from the first position toward the second position, and assigning a maximum torque value among the instant torque values to the pedal torque index. 13. The method of claim 10, a rotation path of the pedal having a first position and a second position, wherein the steps (B) and (C) comprise the following steps: (1) detecting a pedal position of the pedal;(2) when the pedal position is between the first position and the second position, measuring an instant torque value, assigning the instant torque value to the pedal torque index, and comparing the pedal torque index with the upper threshold; and(3) re-detecting a pedal position of the pedal, and when the pedal position is still between the first position and the second position, returning back to the step (2). 14. The method of claim 10, wherein in each rotation cycle of the pedal, an execution count for the step (D) is less than an execution count for the step (C). 15. The method of claim 10, wherein the lower threshold and the upper threshold are capable of being adjusted by a user, and an interval between the lower threshold and the upper threshold is kept to be a constant torque difference. 16. The method of claim 15, wherein the constant torque difference is 10 newton meter. 17. The method of claim 10, before the step (A), further comprising the following steps: (1) sensing a rotating speed of the pedal;(2) if the rotating speed is equal to 0, adjusting the pedelec to output at the first assist level and returning back to the step (1); and(3) executing the steps (A) to (E) only when the rotating speed is larger than 0. 18. The method of claim 10, before the step (A), further comprising the following steps: (1) sensing a traveling speed of the pedelec;(2) if the traveling speed is equal to 0, adjusting the pedelec to output at the first assist level and returning back to the step (1); and(3) executing the steps (A) to (E) only when the traveling speed is larger than 0. 19. The method of claim 17, wherein a frequency for sensing the rotating speed is at least 20 times per second. 20. The method of claim 18, wherein a frequency for sensing the traveling speed is at least 20 times per second.