Vehicle Speed Control via Predictive Braking Estimation
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Solution Overview
Problem
Heavy goods vehicles often exceed speed limits on downhill slopes due to gravitational force, leading to speeding violations and resulting in penalty points and potential fines, as existing constant speed brake systems either brake excessively, wasting energy, or fail to alert drivers in time to avoid violations.
Innovation Solution
A method that estimates the need for braking to bring the vehicle's speed below the violation speed before a predetermined time expires, activating a controlled braking force to avoid speeding violations, which can be adjusted based on vehicle acceleration, available braking force, and gradient changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a constant speed brake system is used to restrict vehicle speed on downhill slopes, then speeding violations are reduced, but energy is wasted due to excessive braking
Solution Approach 1:
The system performs preliminary estimation of whether braking is needed to avoid speeding violations before actually applying brakes. By calculating the predicted speed trajectory and comparing it with speed limits, the system activates braking only when necessary, preventing unnecessary energy loss while maintaining reliable speed restriction
Solution Approach 2:
The system continuously monitors vehicle speed, acceleration, and gradient changes, then uses this feedback to dynamically adjust braking decisions. The control system estimates future speed based on current state and applies braking force only when the estimation indicates a violation will occur, optimizing the balance between speed control reliability and energy conservation
2Reliability
If braking force is applied early to prevent speeding violations, then violation risk is reduced, but fuel efficiency decreases due to energy loss
Solution Approach 1:
The system performs preliminary calculation of speed trajectory and braking requirements based on current vehicle state and road gradient. By predicting when speed will exceed limits and calculating the precise braking moment needed, the system avoids premature braking that would waste energy, while still ensuring violations are prevented
Solution Approach 2:
The system dynamically adjusts braking parameters based on real-time conditions including vehicle acceleration, gradient changes, and predicted speed trajectory. By optimizing the braking force magnitude and duration based on these parameters, the system achieves reliable violation prevention with minimal energy consumption
Data Source
Figure 1A
Figure 1B
Figure 2A~2B
AI summary
The present invention provides a method to decelerate a vehicle (100), wherein said vehicle (100) comprises a control system and at least one braking system which may be activated by said control system, for the application of a braking force to decelerate said vehicle (100). The method comprises, when said vehicle (100) is driven at a speed exceeding a first speed (vlim), to estimate whether the application of a braking force is required for the speed (v) of said vehicle (100) to fall below said first speed (vlim) before a first period of time (T1) has expired, and - when the application of a braking force is required, to request the application of a first braking force to decelerate said vehicle. The invention also pertains to a system and a vehicle.