Fluid Pressure Pump Piston Sensing With Guide-Integrated Magnet Sensor
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for measuring the position of a piston in a fluid pressure supply apparatus for vehicle braking systems are indirect and prone to errors, and the assembly of sensors in these systems is complex and difficult.
Innovation Solution
A direct method for accurately measuring the position of a piston using a first magnet and a first magnet sensor disposed on the piston and guide, respectively, within the fluid pressure supply apparatus, allowing for easy assembly and reduced error risk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If an indirect measuring method using a sensor synchronized with the rotating body of a motor is used, then the structure is simple, but the reliability of piston position measurement deteriorates due to high possibility of losing position information
Solution Approach 1:
The patent replaces the indirect mechanical sensing method with a direct magnetic field-based measurement system. A magnet is attached to the piston, and a magnet sensor directly detects the magnet's position, eliminating the need for complex synchronization mechanisms and reducing reliance on rotating body sensors that can fail.
Solution Approach 2:
The patent introduces a magnet as an intermediary element attached to the piston. This magnet serves as a reliable marker that can be directly detected by the magnet sensor, providing accurate position information without requiring complex mechanical linkages or synchronization with the motor's rotating body.
2Ease of manufacture
If a sensor for measuring piston position is disposed at a side of an ECU disposed outside a pump, then the measurement function is separated, but the assembly difficulty of the ECU increases due to the need to arrange the sensor at a correct location
Solution Approach 1:
The patent merges the magnet sensor with the ECU housing, integrating the sensing function directly into the control unit structure. This eliminates the need for separate sensor mounting outside the pump and simplifies assembly by reducing the number of discrete components and their alignment requirements.
Solution Approach 2:
The patent repositions the magnet sensor from an external location to an internal position within the ECU housing, utilizing the three-dimensional space available in the control unit. This spatial reconfiguration allows the sensor to be strategically placed for optimal detection while simplifying 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 enhances the accuracy and reliability of piston position measurement, simplifies sensor assembly, and reduces the risk of errors in the braking 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
Figure 1
Figure 2
Figure 3
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 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.