Hydraulic Brake Leakage Detection via Wheel Dynamics
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Solution Overview
Problem
Existing hydraulic brake systems fail to accurately detect liquid leakage in brake lines without relying on hydraulic pressure, which can lead to inadequate braking performance and safety issues.
Innovation Solution
A hydraulic brake system that utilizes a rear-force control device to apply and control a driving force from the rear side of a pressurizing piston, combined with sensors monitoring wheel rotation, yaw rate, and vehicle deceleration to detect liquid leakage based on changes in these factors and differences in rotational velocity and deceleration between wheels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If hydraulic pressure sensors are used to detect liquid leakage, then detection accuracy is improved, but system complexity and cost increase
Solution Approach 1:
The patent replaces hydraulic pressure sensors with a sensor suite that measures mechanical parameters (wheel rotation speed, yaw rate, vehicle deceleration) to indirectly detect liquid leakage. This substitution eliminates complex pressure sensing while achieving leakage detection through mechanical motion analysis.
Solution Approach 2:
The patent introduces intermediate parameters (wheel rotation, yaw rate, deceleration) as mediators between the hydraulic system and detection mechanism. Instead of directly measuring hydraulic pressure, the system measures these intermediate mechanical parameters that change when liquid leakage occurs, providing indirect but effective detection.
2Reliability
If multiple sensors are added to detect leakage without pressure measurement, then detection capability is improved, but device complexity increases
Solution Approach 1:
The patent makes existing sensors serve multiple functions: wheel rotation sensors detect both speed and leakage conditions, yaw rate sensors detect both steering and leakage asymmetry, and deceleration sensors detect both braking and leakage. This multi-functionality improves reliability without adding dedicated leakage sensors.
Solution Approach 2:
The system uses the vehicle's own operational parameters (wheel rotation, steering angle, deceleration) that are already being measured for other purposes. By analyzing these existing measurements for leakage patterns, the system achieves self-diagnosis without requiring additional sensing infrastructure.
3Ease of operation
If hydraulic pressure-based detection is used, then leakage detection is straightforward, but braking performance may be compromised during detection
Solution Approach 1:
The patent enables continuous monitoring of leakage through ongoing measurement of wheel rotation, yaw rate, and deceleration during normal braking operations. This continuous action allows leakage detection without interrupting or compromising braking performance, as the same sensors operate throughout the braking process.
Solution Approach 2:
The system performs preliminary detection of leakage conditions by analyzing sensor data before critical failures occur. By continuously monitoring the intermediate parameters, the system can identify leakage trends and alert operators before braking performance is significantly compromised, enabling preventive maintenance.
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
Enables reliable detection of liquid leakage by analyzing rear force, wheel rotation state, and vehicle running conditions, ensuring timely intervention and maintaining braking performance.
Implementation Method 1
a pressurizing piston; a front chamber located in front of the pressurizing piston... designed to generate a hydraulic pressure related to a brake operating force
Implementation Method 2
a liquid leakage detector configured to detect that there is a liquid leakage from a hydraulic pipe line... in a case where a value detected by the master-cylinder-pressure sensor is small when compared with a hydraulic pressure in the front chamber which is estimated based on a value detected by the foot power sensor
Data Source
AI summary
In a hydraulic brake system including a cylinder device that includes a front chamber and a rear chamber located on front and rear sides of a pressurizing piston, respectively, presence or absence of liquid leakage from a brake line is detected based on a hydraulic pressure in the rear chamber. Where a state in which a subtraction value obtained by subtracting an actual rear hydraulic pressure from a target rear hydraulic pressure is larger than a first malfunction determination threshold value has continued for a time not shorter than a first malfunction determination time, and then an increase of the actual rear hydraulic pressure at a rate not lower than a set rate has caused the subtraction value to become smaller than a return determination threshold value, it is determined that the pressurizing piston has been bottomed due to liquid leakage from the front chamber.