Wheel Vertical Force Compensation for ABS Braking Control
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Solution Overview
Problem
Existing antilock braking systems (ABS) for vehicles do not adequately address the issue of maintaining optimal braking performance when vehicle wheels experience different vertical forces, leading to underbraking sensations during inclines or off-road conditions.
Innovation Solution
A system that determines the wheel vertical forces of multiple vehicle wheels and adjusts the wheel behavior by setting parameters such as wheel torque, speed, and acceleration for the wheel with lower vertical force to match those of the wheel with higher vertical force, using sensors and an antilock braking system to maintain consistent braking across all wheels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ABS is used without wheel vertical force compensation, then the system structure remains simple, but underbraking occurs on inclines or off-road where wheel vertical forces differ
Solution Approach 1:
The system determines wheel vertical forces in advance before braking operation and uses these forces to compensate ABS control parameters. This preliminary determination allows the system to pre-adjust control strategies based on actual wheel loading conditions, preventing underbraking before it occurs.
Solution Approach 2:
The system changes ABS control parameters (such as target wheel torques or wheel speeds) based on determined wheel vertical forces. When vertical forces differ between wheels, the control parameters are adjusted accordingly to ensure optimal braking performance for each wheel's specific loading condition.
2Ease of operation
If wheel vertical force determination and compensation is implemented, then underbraking is prevented, but the device complexity increases
Solution Approach 1:
The system uses the vehicle's existing suspension sensors (spring travel sensors) to determine wheel vertical forces without requiring separate measurement devices. The suspension system's own sensors serve the dual purpose of suspension control and braking control, making the system self-sufficient.
Solution Approach 2:
The spring travel sensors in the suspension system are used for multiple functions: both suspension control and wheel vertical force determination for braking control. This multi-functionality reduces the need for additional dedicated sensors and simplifies the overall system architecture.
3Productivity
If wheel vertical forces are equalized through control, then all wheels contribute to deceleration, but energy consumption increases
Solution Approach 1:
The system applies different control strategies to different wheels based on their individual vertical forces. Each wheel's braking control is optimized for its specific loading condition rather than applying a uniform control strategy to all wheels, maximizing braking efficiency for each wheel's capabilities.
Solution Approach 2:
The system allows wheels with higher vertical forces to contribute more to braking (excessive action relative to their load) while wheels with lower vertical forces contribute less. This partial differentiation optimizes overall braking efficiency without requiring all wheels to operate at maximum capacity simultaneously.
Data Source
AI summary
A system for a vehicle for controlling/adjusting the wheel behaviour of at least one vehicle wheel comprises at least one unit for determining the wheel vertical force of at least two vehicle wheels which are mounted on the same axle of the vehicle. The system is adapted to determine for each of the at least two vehicle wheels at least one parameter indicative of the wheel behaviour. The system is further adapted to determine, on the basis of the wheel vertical forces determined by the unit for determining the wheel vertical force for the at least two vehicle wheels, at least the vehicle wheel with the higher wheel vertical force. The system is further adapted to set the at least one parameter indicative of the wheel behaviour determined for the at least one vehicle wheel with the higher wheel vertical force as the target value for the vehicle wheel with a lower wheel vertical force.