Brake Pressure Sensor With Variable Stiffness for Low-Pressure Accuracy
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Solution Overview
Problem
Conventional brake pressure sensors face challenges in achieving high precision in the middle/low pressure region while maintaining stiffness within the limit due to changes in output values in the high pressure region, which is crucial for effective brake control in vehicles.
Innovation Solution
The proposed brake pressure sensor includes a housing part, an induction part, an adjusting part, a support part, and a measurement part. The adjusting part is embedded in the housing part and moves in response to hydraulic pressure, adjusting the spacing between itself and the induction part to control the flow rate of oil, thereby improving measurement accuracy at middle/low pressures and stabilizing the measurement of maximum required brake pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the pressure sensor uses a limited output resource with wide regions evenly set, then the device complexity is reduced, but the measurement precision is degraded due to large pressure variation per output signal
Solution Approach 1:
The pressure measurement range is divided into multiple regions (first region, second region, third region) with different stiffness characteristics. The adjusting part segments the single measurement chamber into multiple functional zones, allowing different pressure variations per output signal in different regions, thereby improving measurement precision without excessive complexity
Solution Approach 2:
Different regions within the measurement chamber are assigned different stiffness properties through the adjusting part positioning. The first region (low pressure) has different characteristics than the second region (middle pressure) and third region (high pressure), allowing optimized measurement precision for each local region while maintaining overall system functionality
2Strength
If the pressure sensor is designed for high pressure region with large brake force, then the stiffness is increased, but the precision in middle/low pressure region is degraded
Solution Approach 1:
The adjusting part is designed to move dynamically in response to hydraulic pressure changes. As pressure increases from low to high, the adjusting part automatically repositions itself, changing the effective stiffness of the measurement chamber. This dynamic adaptation allows the system to maintain appropriate stiffness for each pressure region, preserving precision in middle/low pressure regions while maintaining capability for high pressure measurement
3Measurement precision
If the adjusting part moves according to hydraulic pressure to adjust spacing, then the measurement accuracy in middle/low pressure region is improved, but the device complexity increases
Solution Approach 1:
The adjusting part automatically positions itself based on the hydraulic pressure it measures, without requiring external control mechanisms. The hydraulic pressure itself drives the adjustment, creating a self-regulating system that improves measurement accuracy while avoiding the complexity of externally controlled adjustment mechanisms
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 measurement accuracy in the middle/low pressure region and ensures stable measurement of high brake pressures, effectively addressing the limitations of conventional sensors.
Implementation Method 1
as a spacing between the adjusting part and the induction part is varied while the adjusting part is moved according to hydraulic pressure
Implementation Method 2
a measurement part connected to the support part, and configured to measure the pressure of the oil having passed through the support part
Data Source
AI summary
A brake pressure sensor may include: a housing part; an induction part mounted in a first end portion of the housing part, and configured to guide oil; an adjusting part embedded in the housing part, and configured to guide oil, and adjust an amount of oil passing therethrough, as a spacing between the adjusting part and the induction part is varied while the adjusting part is moved according to hydraulic pressure; a support part mounted in a second end portion of the housing part, and configured to support the adjusting part and guide the oil having passed through the adjusting part; and a measurement part connected to the support part, and configured to measure the pressure of the oil having passed through the support part.