Brake Torque Control Using Pitch-Angle Wheel Load Calculation
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Solution Overview
Problem
Existing brake systems for motor vehicles struggle to optimize braking power across varying pitching behaviors during different driving situations, as conventional methods rely on characteristic curves that are not universally applicable.
Innovation Solution
A method that calculates normal forces on wheels based on pitch angle using a programmed model, considering vertical and rotary movements, to determine maximally deliverable braking power, and adjusts braking torque compensation factors for optimal braking performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If characteristic curves are used to consider pitching behavior, then braking effect is optimized for specific driving situations, but the method is not transferable to other driving situations
Solution Approach 1:
The patent changes from using fixed characteristic curves to dynamically calculating normal forces based on pitch angle and vehicle parameters. The normal force FN is calculated as FN = m*g*cos(φ) + Fp, where φ is the pitch angle and Fp is the longitudinal force component. This parameter-based approach allows the braking system to adapt to any driving situation by continuously updating the calculation based on current vehicle state, resolving the contradiction between reliability for specific situations and versatility across all situations.
2Adaptability or versatility
If wheel brakes are actuated based on pitch angle, then braking power is optimized across all driving situations, but calculation complexity increases
Solution Approach 1:
The patent segments the complex braking optimization problem into manageable calculation components: (1) determining pitch angle from vehicle sensors, (2) calculating normal force using the formula FN = m*g*cos(φ) + Fp, (3) determining braking force based on normal force and friction coefficient. This segmentation reduces calculation complexity while maintaining adaptability across all driving situations, as each component can be independently computed from available sensor data.
Solution Approach 2:
The system uses already-available vehicle sensors (accelerometers, gyroscopes, wheel speed sensors) to provide the data needed for pitch angle calculation, eliminating the need for additional specialized sensors. The braking control unit itself performs the calculations using data from existing vehicle systems, making the solution self-sufficient and reducing overall system complexity while maintaining universal applicability.
Data Source
AI summary
A method for operating a brake system of a motor vehicle. The motor vehicle has a vehicle body and multiple wheels mounted relative to the vehicle body by a wheel suspension on the vehicle body. The vehicle body is capable of executing a pitching movement by the wheel suspension. The brake system has a wheel-individual wheel brake for at least some of the wheels. A pitch angle of the vehicle body is monitored, and the wheel brakes are actuated as a function of the acquired pitch angle. The pitch angle is calculated as a function of normal forces acting on the wheels.