In-Wheel Motor Steering Load Compensation
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Solution Overview
Problem
In-wheel motor vehicles experience increased steering load during braking, leading to reduced steering performance and quality, necessitating higher steering capacity settings that increase weight and material costs.
Innovation Solution
A control method that determines high steering load states by monitoring motor current or torque levels and releases the front wheel brake, using the in-wheel motor to compensate for the steering load by adjusting the tire rotational angle, thereby reducing the steering load without increasing steering capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the steering capacity is set higher to handle increased steering load during braking, then the steering performance and quality are improved, but the vehicle weight and material cost increase
Solution Approach 1:
The patent applies dynamics by making the steering system adaptive through real-time monitoring of steering load conditions. The controller dynamically adjusts steering assistance based on detected load levels, allowing the system to provide enhanced support only when needed (during high-load braking conditions) rather than maintaining constantly high steering capacity. This resolves the contradiction by enabling adequate steering performance during critical moments without the penalty of permanently increased vehicle weight.
Solution Approach 2:
The patent changes the parameter of steering assistance level based on detected steering load conditions. By monitoring steering load and adjusting the control parameters of the steering motor accordingly, the system provides variable steering support - increasing assistance during high-load braking conditions and reducing it during normal conditions. This parameter adjustment allows the vehicle to maintain good steering performance when needed without requiring permanently oversized steering components that would increase weight.
2Reliability
If the steering capacity is set higher to handle increased steering load during braking, then the steering quality is improved, but the material cost increases
Solution Approach 1:
The system dynamically adjusts steering assistance based on real-time load conditions, allowing standard steering components to perform adequately during normal operation while providing enhanced support only during high-load braking conditions. This dynamic adaptation eliminates the need for expensive oversized steering components that would be required to handle peak loads continuously, thus reducing material costs while maintaining steering quality when needed.
Solution Approach 2:
By changing the control parameters of the steering motor based on detected steering load, the system optimizes the performance of standard steering components. The controller adjusts assistance levels to match actual steering demands, allowing conventional steering hardware to deliver high steering quality during critical braking moments without requiring expensive upgrades to the entire steering system.
3Speed
If the front wheel brake is applied during steering, then the vehicle stopping performance is improved, but the steering load increases
Solution Approach 1:
The system applies preliminary anti-action by detecting high steering load conditions caused by brake application and automatically compensating with additional steering motor torque. When the controller detects that the steering load exceeds a threshold (indicating brake-on-steering conditions), it activates compensatory steering assistance to counteract the increased load, allowing the driver to maintain steering control even while braking.
Solution Approach 2:
The system uses feedback by continuously monitoring steering motor current or torque to detect high steering load conditions. When the feedback indicates excessive load (threshold exceeded), the controller responds by adjusting steering motor output to provide compensatory assistance. This closed-loop feedback mechanism enables the system to automatically adapt to brake-induced steering load increases and maintain steering performance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method effectively reduces steering load during steering, enhancing steering performance and quality without increasing vehicle weight or material costs by using in-wheel motor compensation control.
Implementation Method 1
driving an in-wheel motor of the front wheel for a compensation by the determined required tire rotational angle of the front wheel
Implementation Method 2
maintaining, by the controller, a front wheel brake in a released state
Data Source
AI summary
A control method of an in-wheel motor vehicle includes: determining, by a controller, a state of a steering load that is a load of a steering system; maintaining, by the controller, a front wheel brake in a released state, when the state of the steering load is in a high load state of a predetermined level or more; determining, by the controller, a tire angle of a front wheel according to a driver steering input based on driver steering input information in the released state of the front wheel brake; determining, by the controller, a required tire rotational angle of the front wheel by using the determined tire angle of the front wheel; and reducing, by the controller, the steering load by driving an in-wheel motor of the front wheel for a compensation by the determined required tire rotational angle of the front wheel.