Hydraulic Roll-Off Protection for Motor Vehicles
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Solution Overview
Problem
The existing parking brake systems in motor vehicles are inadequate in preventing roll-off, as they fail to account for transmission position, engine idle speed, and incline, leading to unwanted vehicle movement even when the parking brake is engaged.
Innovation Solution
An apparatus comprising sensors for monitoring parking brake, transmission, and wheel rotation, coupled with a brake controller and an electric brake fluid pump, dynamically adjusts hydraulic pressure to the wheel brakes to prevent roll-off by increasing pressure until vehicle movement ceases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the parking brake is applied without considering transmission position and engine idle speed, then the parking brake structure is simple, but the vehicle may still roll off due to inadequate braking force
Solution Approach 1:
The system performs preliminary detection of transmission position and engine idle speed before activating the parking brake. This allows the control system to pre-calculate the required brake pressure and engage the parking brake with appropriate force from the start, preventing roll-off without requiring complex real-time adjustments during braking.
Solution Approach 2:
The system continuously monitors wheel rotation speed and transmission position, providing feedback to the brake controller. Based on this feedback, the controller dynamically adjusts brake pressure to maintain vehicle stability, ensuring reliable parking brake performance while managing system complexity through intelligent control algorithms.
2Reliability
If the parking brake is engaged on an incline with high engine idle speed, then the vehicle remains stationary with adequate brake pressure, but the brake system requires complex monitoring and control mechanisms
Solution Approach 1:
The brake control system serves multiple functions: it monitors transmission position, detects wheel rotation, calculates required brake pressure based on incline and engine speed, and executes precise brake application. This multi-functional approach ensures vehicle stability on inclines while consolidating control logic to manage system complexity.
Solution Approach 2:
The system dynamically adjusts brake pressure parameters based on detected transmission position, engine idle speed, and wheel rotation rate. By changing the pressure parameter in real-time according to operating conditions, the system maintains reliable vehicle stability on inclines without requiring overly complex mechanical structures.
3Reliability
If the parking brake is applied without dynamic pressure adjustment, then the system is simple to operate, but the vehicle may continue to roll after parking brake engagement
Solution Approach 1:
The parking brake system automatically detects transmission position, calculates required pressure, and applies brake force without requiring driver intervention or complex manual adjustments. The system serves itself by using sensor data to autonomously maintain adequate brake pressure, preventing roll-off while keeping the operation simple for the driver.
Solution Approach 2:
The system dynamically adjusts brake pressure based on real-time detection of transmission position and wheel rotation. This dynamic pressure adjustment ensures the vehicle remains stationary under varying conditions (incline, engine speed) while the driver only needs to engage the parking brake with a single action, maintaining ease of operation.
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
Effectively prevents vehicle roll-off by dynamically adjusting brake pressure based on real-time vehicle conditions, ensuring the vehicle remains stationary when the parking brake is engaged, even on inclines or with high engine idle speeds.
Implementation Method 1
The pump is configured to increase a discharge pressure of pump output to a target discharge pressure
Implementation Method 2
A wheel rotation sensor, a transmission gear position sensor and an accelerator pedal sensor are all coupled into a brake controller
Data Source
AI summary
“Roll-off” is considered to be any unwanted vehicle movement after a parking brake is engaged. Roll-off is prevented or reduced by a method and apparatus that adjusts hydraulic brake pressure applied to vehicle wheel brakes if unintended motion is detected when the parking brake is engaged and the vehicle's transmission is not in the park position.