Piston Position Sensing in Fluid Pressure Supply Assemblies
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Solution Overview
Problem
Conventional methods for measuring the position of a piston in electric brake systems are indirect and prone to errors due to sensor malfunctions or assembly difficulties.
Innovation Solution
A fluid pressure supply apparatus that directly measures the position of a piston using a first magnet and a first magnet sensor disposed on the piston and guide, respectively, allowing for accurate positioning and easy sensor placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an indirect measuring method using a sensor synchronized with the rotating body of a motor is used, then the position of the piston can be measured, but there is a high possibility of losing position information due to sensor malfunction or S/W execution error
Solution Approach 1:
The patent replaces the indirect electrical sensing method with a direct mechanical measurement approach. A magnet is attached to the piston and a magnet sensor is mounted on the guide, creating a direct mechanical linkage for position detection that eliminates the need for software synchronization and indirect calculations, thereby improving both measurement precision and reliability
Solution Approach 2:
The patent introduces a magnet as an intermediary element attached to the piston and a magnet sensor as a mediator on the guide. This intermediary magnetic field system enables direct position detection without relying on the motor's rotating body or software processing, resolving the reliability issues of indirect measurement methods
2Ease of operation
If a sensor for measuring piston position is disposed at a side of an electronic control unit outside the pump, then the ECU can process the position data, but the assembly difficulty increases due to the need to arrange the sensor at a correct location
Solution Approach 1:
The patent merges the sensor placement with the existing guide structure by mounting the magnet sensor directly on the guide. This integration eliminates the need for separate sensor arrangement on the ECU and reduces assembly complexity while maintaining correct positioning functionality
Solution Approach 2:
The guide structure serves dual purposes: it guides the piston movement and simultaneously provides the mounting position for the magnet sensor. This self-service approach eliminates the need for separate sensor positioning operations and simplifies the overall assembly process
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 direct measurement method reduces the risk of position information loss and simplifies the assembly of the electronic control unit by placing sensors within the housing, enhancing the reliability and ease of assembly of the brake system.
Implementation Method 1
a first magnet sensor which is disposed on the guide and detects a change in a magnetic field of the first magnet according to the linear motion of the piston
Data Source
AI summary
Disclosed is a fluid pressure supply apparatus. The fluid pressure supply apparatus may include a motor including a stator and a rotor, a motion conversion device which converts a rotational motion of the rotor into a linear motion, a piston which is connected to the motion conversion device and performs a linear motion, a housing which includes a cylinder, in which the piston is disposed to perform the linear motion, and a guide extending in a longitudinal direction of the cylinder and inserted into the piston and in which a fluid pressed by the piston is disposed in a space between an inner circumferential surface of the cylinder and an outer circumferential surface of 10 the guide, a first magnet disposed on the piston, and a first magnet sensor which is disposed on the guide and detects a change in a magnetic field of the first magnet according to the linear motion of the piston.