Brake Control System for Off-Road Vehicle Hold Stability
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Solution Overview
Problem
Existing automatic parking brake systems are inadequate for off-road situations, particularly for SUVs, as they fail to provide sufficient holding torque and start-up assistance, leading to vehicle roll-back issues due to uneven weight distribution and reduced contact force at individual wheels.
Innovation Solution
An electronic control unit in the brake control system determines the required brake pressure based on longitudinal inclination, contact force distribution, and torque transmission capability of all wheels, adapting brake pressure to ensure stable standstill and start-up in off-road conditions by increasing braking torque when reduced contact force is detected and considering friction coefficient for driven wheels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional automatic parking brake systems are used, then the system is simple and easy to operate, but the holding torque is insufficient for off-road situations with uneven weight distribution
Solution Approach 1:
The brake control system dynamically adjusts brake pressure based on real-time detection of contact force distribution at individual wheels. The electronic control unit continuously monitors wheel contact forces and redistributes brake pressure accordingly, transforming the static brake system into a dynamic one that adapts to changing off-road conditions to maintain sufficient holding torque.
Solution Approach 2:
The patent segments the brake control into individual wheel control rather than treating the vehicle as a whole. The electronic control unit independently determines and applies brake pressure to each wheel based on its specific contact force conditions, allowing targeted intervention at wheels with reduced contact force to prevent vehicle roll-back.
2Reliability
If brake pressure is increased to prevent roll-back, then holding capability improves, but the system cannot adapt to varying contact force distribution at individual wheels
Solution Approach 1:
The system incorporates feedback through sensors that continuously detect contact force distribution at individual wheels. This feedback information is processed by the electronic control unit, which then adjusts brake pressure distribution accordingly. The closed-loop control ensures the system adapts to varying contact force conditions while maintaining vehicle hold stability.
Solution Approach 2:
The patent applies local quality by treating each wheel independently with customized brake pressure based on its specific contact force conditions. Rather than applying uniform brake pressure to all wheels, the system tailors the braking force to the local conditions at each wheel contact point, optimizing both stability and adaptability.
3Reliability
If the system detects and responds to reduced contact force at individual wheels, then off-road performance improves, but the detection and control complexity increases
Solution Approach 1:
The electronic control unit serves as an intermediary that processes sensor data from the wheel contact force detection system and translates it into appropriate brake pressure commands. This intermediary layer simplifies the overall system architecture by centralizing the complex detection and control logic in a dedicated control unit, making the system more manageable despite the increased sophistication required.
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 prevents uncontrolled rolling and ensures safe restart in off-road situations by dynamically adjusting brake pressure, allowing drivers to focus on navigation and smooth acceleration without simultaneous two-foot operation.
Implementation Method 1
brake force can be established and terminated or can be held at least temporarily
Data Source
AI summary
A brake control system has an electronic control unit such that, when the motor vehicle is at a standstill, an automatic parking brake function can be activated by the control unit. In the presence of an activation condition for the parking brake function, the brake pressure required for this purpose can be determined at least in a manner dependent on the longitudinal inclination and in a manner dependent on an estimated normal force distribution of all of the wheels and/or an estimated capability of all of the wheels to transmit braking and/or drive torque to the underlying surface. Here, the brake pressure can be predefined to be higher the more wheels have a reduced normal force.