To provide an electrically assisted bicycle that is able to exhibit a good push walk function while avoiding an increase in cost of the bicycle.SOLUTION: A control device 30 comprises: a vehicle speed calculation unit 32 that calculates a change gear ratio of a transmission mechanism 27 based on an output from a vehicle speed sensor 43 and an output from a rotation sensor 42 in response to acquisition of an output from the vehicle speed sensor 43 and calculates a vehicle speed based on the calculated change gear ratio and the output from the rotation sensor 42 at a frequency higher than a frequency of acquiring an output from the vehicle speed sensor 43; an initial target calculation unit 34 that calculates a target work rate without using an output from the vehicle speed sensor 43 in a predetermined period ΔTi from start of a push walk when receiving a push walk command; and a target calculation unit 33 that, after a lapse of the predetermined period ΔTi, calculates a target work rate based on the vehicle speed calculated by the vehicle speed calculation unit 32.SELECTED DRAWING: Figure 6

    【課題】自転車のコスト増を回避しながら、良好な押し歩き機能を発揮できる電動補助自転車を提供する。【解決手段】制御装置30は、車速センサ43の出力を取得するのに応じて車速センサ43の出力と回転センサ42の出力とに基づいて変速機構27の変速比を算出し、車速センサ43の出力を取得する頻度よりも高い頻度で、算出された変速比と回転センサ42の出力とに基づいて車速を算出する車速算出部32と、押し歩き指令を受けたとき、押し歩きの開始から所定期間ΔTiにおいて、車速センサ43の出力を利用することなく目標仕事率を算出する初期目標算出部34と、所定期間ΔTiの経過後に、車速算出部32が算出した車速に基づいて目標仕事率を算出する目標算出部33と、を有する。【選択図】図6


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    Title :

    ELECTRICALLY-ASSISTED BICYCLE, DRIVING SYSTEM THEREOF, AND MANUFACTURING METHOD


    Additional title:

    電動補助自転車、その駆動システム、及び製造方法


    Contributors:

    Publication date :

    2021-07-29


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B62M RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES , Antrieb von Radfahrzeugen oder Schlitten durch den Fahrer / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen / B62J Fahrrad- oder Motorradsättel oder -sitze , CYCLE SADDLES OR SEATS