Brake Master Cylinder Sensor Layout for Precise Travel Detection
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Solution Overview
Problem
The distance between a permanent magnet and a sensing element in a vehicle's braking system affects the precision of the travel sensor, leading to reduced signal quality and increased complexity in the braking apparatus.
Innovation Solution
A reasonable layout of the permanent magnet and travel sensor is implemented, with the magnet positioned inside the master cylinder part and the sensor fixed on the hydraulic block, reducing the gap and dimension chain between them, and incorporating a non-ferromagnetic structure sleeve to minimize magnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the permanent magnet is positioned farther from the sensing element, then the structure is simpler and assembly is easier, but the signal precision of the travel sensor deteriorates
Solution Approach 1:
The permanent magnet is nested inside the master cylinder part, which itself is installed on the hydraulic block. This nested arrangement allows the magnet to be positioned close to the sensing element (improving signal precision) while maintaining a compact overall structure that doesn't significantly increase assembly complexity.
2Measurement precision
If the gap between the permanent magnet and the sensing element is reduced, then the signal precision is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The master cylinder part integrates multiple functions: it houses the permanent magnet, provides a mounting interface on the hydraulic block, and defines the positioning for the sensing element. By merging these functions into a single component, the patent reduces the number of separate parts and their associated dimension chains, thereby reducing manufacturing precision requirements while maintaining a small gap between the magnet and sensing element.
3Measurement precision
If the permanent magnet is positioned closer to the sensing element, then the signal precision is improved, but the device complexity increases
Solution Approach 1:
The master cylinder part serves multiple purposes: it acts as a structural support, a housing for the permanent magnet, a mounting platform for the sensing element, and a hydraulic component. This multi-functionality eliminates the need for separate positioning structures, thereby reducing layout complexity while enabling close positioning of the magnet and sensing element for improved signal precision.
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 design enhances signal precision of the travel sensor, simplifies the structure, reduces assembly complexity, and improves the overall performance of the braking apparatus.
Implementation Method 1
a travel sensor in the braking apparatus generally uses a magnetic induction principle. When a permanent magnet moves with a change of a pedal travel, a sensing element in the travel sensor detects a magnetic field change
Implementation Method 2
a sensing element in the travel sensor detects a magnetic field change and converts the magnetic field change into an electrical signal
Data Source
AI summary
A braking apparatus includes a hydraulic block, a master cylinder part, and a travel sensor. The hydraulic block is provided with a first groove and a second groove. The second groove extends in a first direction. The master cylinder part is located in the second groove and is in sliding contact with the second groove. The master cylinder part in the second groove is internally provided with a permanent magnet. The travel sensor is located in the first groove and is fixedly coupled to the hydraulic block, and is configured to detect a movement amount of the permanent magnet.