Electrohydraulic Brake Force Distribution for Electric Bicycles
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Solution Overview
Problem
Conventional braking systems for vehicles, such as electric bicycles, often result in an unfavorable distribution of brake forces between the front and rear wheels, leading to increased wear and potential wheel locking, especially in hazardous situations, which can prolong braking distances and increase the risk of loss of control.
Innovation Solution
A method and device that utilize an electrohydraulic brake force influencing system, controlled by a brake pressure control device, to optimize the distribution of brake forces between the front and rear wheels based on sensor data, including brake actuation detection, acceleration, and vehicle dynamics, allowing for adaptive adjustment of brake pressure to prevent wheel locking and enhance safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the driver directly controls the brake pressure without assistance, then the braking operation is simple and direct, but the brake force distribution between front and rear wheels becomes unfavorable, leading to increased wear and potential wheel locking
Solution Approach 1:
The brake pressure control device acts as an intermediary between the driver's braking input and the actual brake pressure application. It receives the driver's braking signal and automatically adjusts the brake pressure distribution between front and rear wheels based on vehicle dynamics, thereby optimizing brake force distribution without requiring direct driver control of individual wheel brakes
Solution Approach 2:
The brake pressure control device monitors vehicle dynamics parameters (acceleration, speed, wheel rotation) and automatically adjusts brake pressure distribution without continuous driver intervention. The system serves itself by using sensor data to autonomously optimize braking performance, reducing wear and preventing wheel locking while maintaining simple driver operation
2Productivity
If conventional braking systems are used without electrohydraulic influence, then the system structure is simpler, but the braking distance is prolonged and wheel locking risk increases in hazardous situations
Solution Approach 1:
The system replaces purely mechanical brake pressure control with an electrohydraulic system. The brake pressure control device uses electrical signals based on sensor feedback to hydraulically adjust brake pressure, enabling rapid and precise control of brake force distribution that shortens braking distance and prevents wheel locking
Solution Approach 2:
The brake pressure control device continuously monitors vehicle dynamics through sensors (acceleration, speed, wheel rotation) and uses this feedback to automatically adjust brake pressure distribution. This closed-loop control system optimizes braking performance in real-time, adapting to hazardous situations to minimize braking distance and prevent wheel locking
3Reliability
If the driver manually optimizes brake force distribution, then the brake force distribution can be optimal, but this requires very experienced drivers and increases the difficulty of operation for average users
Solution Approach 1:
The brake pressure control device automatically performs the complex task of optimizing brake force distribution without driver intervention. The system uses sensor data to autonomously determine the optimal brake pressure distribution, making advanced braking performance accessible to average drivers while maintaining simple operation
Solution Approach 2:
The brake pressure control device serves as an intelligent intermediary that translates the driver's simple braking input into optimized brake force distribution. It handles the complex calculations and adjustments automatically, bridging the gap between simple driver operation and optimal braking performance
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution optimizes brake force distribution to reduce wear on brakes and tires, minimize the risk of wheel locking, and shorten braking distances, while also potentially reducing the need for ABS intervention in critical situations, thereby improving safety and vehicle control.
Implementation Method 1
a hydraulic front wheel brake and a hydraulic rear wheel brake, each of which is separately actuatable by a driver. The brake pressure effectuated at the front wheel brake or the rear wheel brake may be changed with the aid of an electrohydraulic brake force influencing device
Implementation Method 2
A piezo stack is integrated into the hydraulic line of the braking device. By activating the piezo stack, it may expand or contract, causing the volume in the line of the braking device to increase or decrease
Data Source
AI summary
A method for braking a vehicle which is operable by a motor or by muscular power, in particular an electric bicycle. During a braking operation, a brake force influencing device is controlled by an electric brake pressure control device, and the brake pressure for the front wheel brake and/or for the rear wheel brake, and thus the brake force thereof, is increased and/or decreased. The brake pressure control device receives brake pressure signals in each case from a brake actuation detector for the front wheel brake and for the rear wheel brake, and an improved distribution of a total brake force on the front wheel and the rear wheel is effectuated which differs from the distribution that is effectuated by the driver.