ELECTRICALLY ASSISTED BICYCLE

• Main Author: SHIMAZU MASAHIRO
• Format: Patent
• Language: English
• Published: 01.12.2011
• Subjects: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TOTRANSPORTATION; CYCLES; ELECTRIC EQUIPMENT OR PROPULSION OF ELECTRICALLY-PROPELLEDVEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES, IN GENERAL; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; PERFORMING OPERATIONS; POWERED PROPULSION OF SLEDGES OR; RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES; TRANSPORTING; VEHICLES IN GENERAL

PROBLEM TO BE SOLVED: To provide an electrically assisted bicycle to which suitable auxiliary force is applied according to a travelling environment.SOLUTION: The electrically assisted bicycle includes a traveling environment load setting table in which various types of traveling environment loads are predefined by employing a bicycle traveling speed and a torque applied to a crankshaft as variables. A traveling environment load is detected by fitting a torque detected by a torque detecting unit 43 and a traveling speed detected by a traveling speed detecting unit 42 in the table. A control unit 31 sets a ratio (assist ratio) of an assist drive force to be generated by an electric drive system to a drive force generated by a human power drive system based on the detected load, and causes the electric drive system to generate the assist drive force at the set ratio.