Brake Torque Distribution Control for Heavy-Vehicle Judder
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Solution Overview
Problem
Heavy-duty vehicles experience brake judder during braking events due to irregularities in brake drums or disks, leading to discomfort for the driver without compromising braking performance.
Innovation Solution
A computer system that determines oscillation amplitude and compares it with predefined reference values to control brake torque distribution between front and rear axle brakes, adjusting the distribution based on brake request values to minimize judder perception while maintaining desired braking performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If brake torque is applied to front axle brakes during braking, then braking performance is improved, but driver discomfort increases due to brake judder
Solution Approach 1:
The system dynamically adjusts the brake torque distribution between front and rear axles based on real-time oscillation detection. When judder is detected, the system automatically modifies the braking force allocation, shifting torque from the problematic front axle to the rear axle, thereby maintaining braking effectiveness while reducing driver discomfort.
Solution Approach 2:
The system changes the operating parameters of the braking system by adjusting the torque distribution ratio between front and rear axles. This parameter modification allows the system to optimize the balance between braking performance and comfort, reducing the harmful oscillations transmitted to the driver while preserving the total braking force.
2Object-affected harmful factors
If brake torque distribution is adjusted to reduce judder, then driver comfort is improved, but braking performance may be compromised
Solution Approach 1:
The system continuously monitors oscillation levels during braking and uses this feedback to adjust torque distribution in real-time. This closed-loop control ensures that braking performance is maintained at the required level while minimizing driver discomfort, as the system only modifies torque allocation when judder is actually detected.
Solution Approach 2:
The torque distribution is made dynamic rather than fixed, allowing the system to adapt to actual braking conditions. When judder is detected, the system temporarily adjusts the distribution to reduce discomfort, while maintaining the ability to restore optimal braking performance when needed.
3Object-affected harmful factors
If oscillation amplitude is reduced through brake distribution control, then driver comfort increases, but system complexity increases
Solution Approach 1:
The system introduces a control unit as an intermediary that automatically manages the torque distribution based on oscillation detection. This intermediary component handles the complexity of real-time adjustments, shielding the driver from the system's complexity while delivering improved comfort through automated torque reallocation.
Data Source
AI summary
A computer system including processing circuitry configured to: determine, during a braking event of a vehicle, an oscillation amplitude of a currently oscillating part of the vehicle; perform an amplitude comparison by comparing the determined oscillation amplitude with a predefined reference value; receive a brake request value indicative of a desired total brake torque or total brake force; perform a brake request comparison by comparing the received brake request value with a predefined brake request value; and control a brake distribution between front axle brakes and rear axle brakes of the vehicle based on the amplitude comparison and the brake request comparison, wherein the brake distribution is in the form of a brake torque distribution of said desired total brake torque or a brake force distribution of said desired total brake force. There is also disclosed a computer-implemented method.