Hydraulic Brake Assist with Compensation Piston for ABS Compatibility
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Solution Overview
Problem
Existing hydraulic brake systems for vehicles driven by muscle strength and/or electromotor, such as e-bikes, face compatibility issues with conventional base brakes due to limited storage chamber dimensions, which can lead to inadequate braking pressure reduction and increased energy consumption.
Innovation Solution
A brake assistance device with a compensation volume and a second piston, preloaded by a spiral spring, which is actuated to modulate braking pressure. This system includes a 2/2 way valve and an actuator to adjust the force effect on the second piston, ensuring compatibility with statutory minimum delay requirements and reducing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the accumulator chamber dimensions are increased to ensure sufficient brake pressure reduction for ABS functionality, then ABS performance is improved, but the system becomes incompatible with conventional base brakes due to limited brake lever displacement volume
Solution Approach 1:
The invention divides the brake fluid storage into two separate chambers: a first chamber (accumulator) for ABS pressure reduction and a second chamber (compensation volume) for maintaining brake pressure. This segmentation allows each chamber to be optimized independently - the first chamber can be small for ABS functionality while the second chamber provides additional fluid volume for compatibility with conventional brakes.
Solution Approach 2:
The invention introduces a compensation volume with a second piston as an intermediary between the brake lever and the brake caliper. This compensation volume acts as a mediator that can supply additional brake fluid when needed, enabling the system to work with conventional base brakes while the first accumulator chamber maintains ABS functionality.
2Force
If the electric motor works against high hand pressure generated by the rider to move the piston, then braking force is improved, but the power requirement increases significantly and the actuator may fail to generate sufficient torque
Solution Approach 1:
The invention pre-loads the second piston in the compensation volume with a prestressing element (spring) before braking occurs. This preliminary action stores potential energy and positions the piston to move in the desired direction during braking, reducing the power required from the electric motor to achieve the necessary braking force.
Solution Approach 2:
The invention makes the system dynamically adaptive by allowing the second piston to move selectively in response to braking conditions. The prestressing element provides a variable force that adapts to the braking situation, enabling the electric motor to work with rather than against the rider's hand pressure in many cases.
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
The solution ensures consistent braking performance by maintaining the statutory minimum delay even with leaks, reduces energy consumption by optimizing braking pressure modulation, and enhances compatibility with conventional base brakes.
Implementation Method 1
a compensation volume (5), in particular a cylinder, which has a second piston (6) arranged therein, which exerts pressure on a hydraulic fluid/brake fluid by means of a prestressing element (7), in particular a spiral spring
Implementation Method 2
The brake assistance device (1) has a sensor (3), in particular a hand lever, and a first piston (4) which acts on a first line section (16) of the hydraulic brake system
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to a vehicle which can be driven by muscle power and/or an electric motor and to a brake assistance device (1) for a hydraulic brake system (2). The brake assistance device (1) comprises a sensor (3) with a first piston (4), a compensation volume (5) with a second piston (6) and a pretensioning element (7), a 2/2-way valve (8), a brake piston (9), and an actuator (11). The pretensioning element (7) is designed to exert a pressure onto the second piston (6) and thus onto a hydraulic fluid of the brake system (2), and the actuator (11) is designed to move the second piston (6) selectively in a first direction or in a second direction oriented opposite the first direction.