E-Bike ABS Control Using the Assist Motor Drive Source
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Solution Overview
Problem
Bicycles equipped with an ABS unit tend to increase in size due to the additional components required for the Antilock Brake System, which can compromise their compactness and efficiency.
Innovation Solution
Integration of an assist motor, ABS unit, assist selection switch, and control device that allows for the control of the ABS unit based on the assist motor's operation mode, reducing the overall size by sharing a drive source and optimizing the ABS unit's operation within the bicycle's existing framework.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an ABS unit is equipped in a bicycle, then braking safety is improved by preventing wheel lockage, but the bicycle size increases due to additional components
Solution Approach 1:
The patent combines the ABS unit and assist motor into a single integrated assembly, where the assist motor serves dual purposes: providing pedaling assistance and driving the ABS pump mechanism. This merging eliminates the need for separate drive sources and reduces overall component count, thereby preventing bicycle size increase while maintaining braking safety functionality
Solution Approach 2:
The assist motor is designed to perform multiple functions: it provides mechanical assistance to the crankshaft during pedaling and simultaneously serves as the drive source for the ABS hydraulic pump. This multi-functionality allows the system to maintain both assist and ABS capabilities without adding extra motors or drive mechanisms, thus avoiding size increase
2Reliability
If an ABS unit with separate drive source is equipped, then braking control reliability is improved, but device complexity and size increase
Solution Approach 1:
The patent merges the ABS control system with the assist motor control system under a single control device. The control device monitors crankshaft rotation, wheel speed, and braking conditions to coordinate assist motor operation and ABS pump activation, thereby reducing control system complexity while maintaining reliable braking control
Solution Approach 2:
The control device is designed to manage multiple functions: it controls the assist motor's pedaling assistance based on crankshaft rotation detection and simultaneously controls the ABS pump operation based on wheel speed sensors and brake lever detection. This unified control approach reduces the number of separate control units needed while ensuring reliable braking control
Data Source
AI summary
A bicycle apparatus comprises an assist motor, an ABS unit, an assist selection switch and a control device. The ABS unit is configured to control a braking force that is applied to a bicycle wheel. The assist selection switch is configured to switch the assist motor between an ON mode in which the assist motor is ON and an OFF mode in which the assist motor is OFF. The control of the ABS unit by the control device is dependent on an operation of the assist selection switch. The control device is configured to control the assist motor to add the assisting force to the manual drive force when the assist motor is in the ON mode. The control device is configured to set the ABS unit to an ABS operating mode to begin control of the ABS unit when the assist selection switch selects the ON mode.