Electronic Brake Control for Vehicle Tension and Air Consumption
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Solution Overview
Problem
Commercial vehicles experience tension due to changes in height, which cannot be compensated when the parking brake is engaged, leading to increased air consumption in existing methods for brake release and re-engagement.
Innovation Solution
The electronic brake system detects tension and releases brakes on both sides to reduce braking only to the extent necessary to alleviate tension without rolling, using wheel speed sensors and displacement sensors to determine the level change and speed, allowing for reduced air consumption while maintaining deceleration within legal limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the brakes are completely released and re-engaged to compensate for wheelbase change, then the tension in the vehicle is reduced, but the air consumption increases significantly
Solution Approach 1:
The patent applies partial action by releasing the brakes only to the extent necessary to allow the axle rocker to pivot and compensate for level change, rather than completely releasing and re-engaging the brakes. This partial release is sufficient to reduce vehicle tension while minimizing air consumption, as the brakes remain partially engaged to maintain vehicle stability.
Solution Approach 2:
The control device monitors brake pressure as a parameter and dynamically adjusts it based on detected level changes. When a level change is detected, the control device modifies the brake pressure parameter to allow controlled wheel rotation for wheelbase compensation, then restores the original brake pressure once compensation is complete, thereby reducing air consumption compared to complete brake release.
2Length of moving object
If the brakes are released to allow wheel rotation for wheelbase compensation, then the wheelbase change is accommodated, but the vehicle may roll away
Solution Approach 1:
The control device uses feedback from level sensors to detect changes in vehicle body level relative to the axles. When a level change is detected, the control device triggers brake pressure adjustment to allow controlled wheel rotation. After the axle rocker has pivoted sufficiently to accommodate the level change, the feedback signal triggers restoration of normal brake pressure, ensuring the vehicle remains stationary while achieving wheelbase compensation.
Solution Approach 2:
The system dynamically adjusts brake pressure based on real-time level conditions rather than maintaining a fixed brake state. The brake pressure is temporarily modified only during the brief period when level change occurs and wheelbase compensation is needed, allowing the system to adapt between maintaining vehicle stability and permitting wheel rotation as conditions require.
3Reliability
If the parking brake is engaged to keep the vehicle stationary, then the vehicle remains braked, but the wheels cannot rotate to compensate for wheelbase change
Solution Approach 1:
The system operates in periodic cycles: normally the parking brake is engaged to maintain vehicle stability, but when level sensors detect a level change, the control device temporarily releases the brakes to allow wheel rotation for wheelbase compensation, then re-engages the brakes once compensation is complete. This periodic switching between braked and unbraked states enables both vehicle stability and wheelbase adaptability.
Data Source
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Figure 3
AI summary
The invention relates to a method for controlling brakes (25) by an electronic braking system in a braked, stationary vehicle (13) when the vehicle's level changes. According to the invention, upon detecting tension in the vehicle (13), the electronic braking system releases brakes (25) on both sides of the vehicle (13), but only to the extent that reduced braking force is still achieved. Further inventions include a vehicle (13) with a control unit (23) in which the method is carried out, a truck and trailer combination (11, 13) with such a vehicle (13), and a control unit (23) suitable for the braking system of the vehicle (13).