Redundant Dynamic Braking With EPB Pressure Control
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Solution Overview
Problem
Current braking systems face challenges in maintaining driving stability and reducing braking distance, especially when the main braking force adjusting device fails, as electronic parking brakes respond slowly and are not linear in pressure application, potentially causing vehicle spins.
Innovation Solution
A redundancy dynamic braking system that includes a main braking force adjusting device, an electronic control braking device, and an auxiliary braking force adjusting device, which controls both hydraulic and electronic braking systems by adjusting current magnitude and application time based on estimated target pressure and driving information to ensure stable braking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electronic parking brake is used as an auxiliary braking device, then the vehicle can continue to drive safely without stopping when the main braking system fails, but the response time is slow and the pressure application is not linear, potentially causing vehicle spins
Solution Approach 1:
The patent applies dynamics by making the braking system adaptable through multiple braking modes (first and second redundancy dynamic braking modes) that can switch based on vehicle conditions. The electronic control braking device adjusts current magnitude and application time dynamically, and the system selects between different braking strategies depending on whether the vehicle is in normal or failure conditions, thereby optimizing response characteristics for each scenario.
Solution Approach 2:
The patent changes parameters by adjusting the magnitude and application time of current applied to the electronic control braking device based on estimated target pressure. The system modifies braking force characteristics through parameter adjustment rather than structural change, allowing linear pressure application and controlled response time while maintaining the same electronic parking brake hardware.
2Productivity
If the electronic parking brake generates excessive braking force, then the braking distance is reduced, but the driving stability deteriorates due to non-linear pressure application and potential vehicle spins
Solution Approach 1:
The patent implements feedback by using wheel speed sensors to detect wheel slip conditions and vehicle state, then adjusting the braking force applied by the electronic control braking device accordingly. The system receives wheel speed information, determines whether wheels are slipping, and modifies current application to maintain stability while achieving effective braking. This closed-loop control prevents excessive braking force that would cause spins.
Solution Approach 2:
The patent applies partial action by using both hydraulic braking devices and electronic control braking devices in combination during normal operation, rather than relying on one system alone. The electronic control braking device supplements the hydraulic system with controlled braking force, achieving better braking efficiency without the excessive force problems of using the electronic system alone, since the hydraulic system handles the primary braking demand.
3Reliability
If the main braking force adjusting device fails, then the vehicle must rely on auxiliary braking means, but the braking performance deteriorates due to the slower response and non-linear characteristics of the electronic parking brake
Solution Approach 1:
The patent applies beforehand cushioning by preparing the auxiliary braking system with the electronic control braking device configured to take over when the main braking system fails. The system pre-establishes redundancy control logic and monitoring mechanisms that detect main system failures and automatically activate the auxiliary system with appropriate control strategies, cushioning the performance loss that would otherwise occur during failure transition.
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 system effectively reduces braking distance and improves deceleration while maintaining driving stability by dynamically controlling electronic control braking devices through different redundancy modes, ensuring safe operation even when the main braking system fails.
Implementation Method 1
an electronic control braking device configured to be operated electrically to generate braking force
Implementation Method 2
a braking device is a device for reducing or stopping the speed of a vehicle in motion, and may be said to be the most important device for vehicle safety. The braking device of a vehicle is a device that utilizes friction force to convert rotational energy of a tire wheel into thermal energy to reduce the speed of the vehicle and stop the vehicle.
Data Source
AI summary
A redundancy dynamic braking system may include: a main braking force adjusting device configured to control a hydraulic braking device of a vehicle; a receiving unit configured to receive driving information of the vehicle; an electronic control braking device configured to be operated electrically to generate braking force; and an auxiliary braking force adjusting device configured to control the hydraulic braking device and the electronic control braking device, in an event of a failure in the main braking force adjusting device, wherein the auxiliary braking force adjusting device is configured to control the electronic control braking device by adjusting a magnitude and an application time of a current applied to the electronic control braking device based on an estimated target pressure using the driving information.