{
  "$type": "site.standard.document",
  "description": "A gear-shifting system (10)(10') for a power-assisted bicycle (90) includes: a power supply module (11); a microcomputer (21)(21'); a gear-shifting driver (31); and a pedal position sensing module (41) for detecting an angular position of a crank (95) of the power-assisted bicycle (90). The…",
  "path": "/patents/979568",
  "publishedAt": "2014-01-15T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60L15/2054",
    "J D COMPONENTS CO LTD [TW]"
  ],
  "textContent": "A gear-shifting system (10)(10') for a power-assisted bicycle (90) includes: a power supply module (11); a microcomputer (21)(21'); a gear-shifting driver (31); and a pedal position sensing module (41) for detecting an angular position of a crank (95) of the power-assisted bicycle (90). The microcomputer (21)(21') has a gear-shifting operation logic (22)(22') and is configured to execute the gear-shifting operation logic (22)(22') before performing a gear-shifting operation. Steps for executing the gear-shifting operation logic (22) include: (1) when the angular position of the crank (95) passes through a first angular position (P1), reducing the assisting power output by the motor (91) to a first power value; (2) when the angular position of the crank (95) leaves the first angular position (P1) and passes through a dead point (Pd), minimizing the assisting power output by the motor (91); (3) performing the gear-shifting operation; (4) when the gear-shifting operation is finished, returning the assisting power output by the motor (91) to a level of the assisting power before the step (1).",
  "title": "Gear-shifting system for power - assisted bicycle"
}