Redundant Brake Traction Control for Main Brake Failure on Slopes
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Solution Overview
Problem
Existing brake traction control systems fail to function effectively when the main hydraulic brake or electronic parking brake malfunctions, leading to difficulties in controlling braking force and maintaining vehicle stability.
Innovation Solution
A redundancy braking system is implemented, utilizing an auxiliary braking force adjusting device that controls both hydraulic and electronic brakes, with sensors to detect vehicle state and road gradient, allowing the system to adjust braking force even in the event of a failure in the main braking system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a main hydraulic brake is used for brake traction control, then fast reaction speed and linear control are achieved, but the system becomes unreliable when the main hydraulic brake malfunctions
Solution Approach 1:
The system performs preliminary action by activating the electronic brake in advance when the main hydraulic brake malfunctions. The control unit detects the failure state and switches to the auxiliary braking force adjusting device, which controls the electronic brake to provide preliminary braking force adjustment, ensuring continuous brake traction control functionality despite the main system failure.
Solution Approach 2:
The electronic brake acts as an intermediary component when the main hydraulic brake fails. The auxiliary braking force adjusting device mediates between the driver's braking demand and the actual braking force application by controlling the electronic brake, providing a backup control path that maintains system functionality through this intermediate device.
2Reliability
If an electronic brake is controlled through an auxiliary braking force adjusting device, then braking force can be adjusted when main brake fails, but reaction delay and difficulty in performing linear braking force control occur
Solution Approach 1:
The system applies parameter changes by adjusting the pre-operation time of the electronic brake based on the detected gradient ratio. When the gradient ratio indicates a higher risk level (steeper slope), the control unit increases the pre-operation time parameter, allowing the electronic brake to engage earlier and compensate for its slower response characteristics, thereby improving effective braking reaction speed under critical conditions.
3Reliability
If pre-operation time of electronic brake is increased to compensate for reaction delay, then braking effectiveness improves, but energy consumption and braking drag increase
Solution Approach 1:
The control unit dynamically changes the pre-operation time parameter based on the detected gradient ratio, applying longer pre-operation time only when the gradient ratio indicates higher risk levels. This conditional parameter adjustment ensures brake traction control effectiveness is improved only when necessary, avoiding unnecessary energy consumption and braking drag during normal driving conditions on flat or gentle slopes.
Data Source
AI summary
A brake traction control system (BTCS) using a redundancy braking system includes a main braking force adjusting device configured to control a hydraulic brake of a vehicle, a sensor unit configured to detect a driving state of the vehicle, an electronic brake electrically operating and configured to generate braking force for at least one driving wheel, and an auxiliary braking force adjusting device configured to control the hydraulic brake and the electronic brake when a failure occurs in the main braking force adjusting device, wherein the auxiliary braking force adjusting device is configured to adjust the braking force of the electronic brake provided on at least one wheel on left and right sides of the vehicle based on a detected value of the sensor unit, wherein the auxiliary braking force adjusting device apply the longer pre-operation time of the electronic brake as a risk level increases, and wherein the risk level is determined based on a gradient ratio of a road on which the vehicle is travelling.