Utility Vehicle Automated Braking Force Estimation
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Solution Overview
Problem
Modern utility vehicles with automated brake systems face challenges in accurately estimating achievable total braking forces, which is crucial for efficient platooning to reduce fuel consumption, as existing methods are impractical and unreliable, especially during ongoing operation.
Innovation Solution
A method that estimates achievable total braking forces by setting partial braking forces at each wheel brake, determining braking characteristic values based on current deceleration and mass, and calculating achievable partial braking forces, allowing for precise estimation of total braking forces without full braking processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If full braking processes are performed to determine braking forces, then measurement accuracy is improved, but productivity deteriorates due to time-consuming tests and impractical operation during ongoing driving
Solution Approach 1:
The patent applies partial braking forces at individual wheel brakes rather than performing full braking processes. By setting and evaluating partial braking forces at each wheel brake separately, the system achieves sufficient measurement accuracy for determining achievable total braking forces without requiring complete braking tests, thus maintaining productivity during ongoing operation
Solution Approach 2:
The patent segments the braking system evaluation into individual wheel brake assessments. By determining partial braking forces and braking characteristic values for each wheel brake separately and then summing them, the system achieves accurate total braking force estimation without requiring full vehicle braking tests, enabling continuous operation
2Measurement precision
If braking characteristic values are determined for each wheel brake individually, then measurement precision is improved, but device complexity increases due to multiple separate determinations
Solution Approach 1:
The patent merges the individual partial braking force determinations from multiple wheel brakes into a single achievable total braking force value. By summing the partial braking forces after determining their respective characteristic values, the system achieves precise measurement without requiring complex separate evaluation systems for each wheel brake
3Reliability
If frequent braking tests are performed to update braking force estimates, then reliability is improved, but loss of time increases due to test execution requirements
Solution Approach 1:
The patent implements feedback by continuously determining current deceleration from measured values and using it to calculate braking characteristic values and achievable total braking forces during ongoing operation. This feedback mechanism maintains reliable and accurate braking force estimates without requiring frequent interruptive braking tests, thus minimizing time loss
Data Source
AI summary
A method for estimating achievable total braking force for an automated deceleration of a vehicle or vehicle combination includes performing, for each respective one of a plurality of brake units, at least partially applying, in an estimation braking operation by the respective brake unit, an estimation braking force configured to cause deceleration and determining, from measured values, a current deceleration caused by the estimation braking force. The method further includes, for each respective brake unit, determining, a respective braking characteristic value of the respective brake unit, the braking characteristic value representing a ratio between a partial braking force of the respective brake unit and a manipulated variable which is set for the partial braking force of the respective brake unit, and determining a respective achievable partial braking force. The method further includes estimating, as a sum of the respective achievable partial braking forces, the achievable total braking force.