Static Steering Windup Reduction for Electric Motor Overheating
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Solution Overview
Problem
Electric motor steering systems in vehicles face overheating issues due to sustained energy demands when maintaining vehicle wheels against tire-generated windup torque loads, leading to diminished torque production and performance degradation.
Innovation Solution
A static windup reduction system that adjusts the steering wheel angle to reduce tire windup, thereby decreasing the motor load and preventing overheating, by employing a computing device to estimate windup angles and adjust the steering system to minimize energy consumption and maintain wheel position without excessive heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the electric motor sustains vehicle wheels in a steering position against tire-generated windup torque load, then the wheel position is maintained, but the motor overheats and experiences diminished torque capability
Solution Approach 1:
The system performs preliminary detection of windup conditions and proactively reduces steering angle to prevent excessive windup torque accumulation. By detecting when the vehicle is stationary and wheels are turned, the system preemptively adjusts the steering angle to minimize windup, thereby preventing motor overheating before it occurs.
Solution Approach 2:
The system dynamically adjusts the steering angle based on real-time detection of vehicle motion state and windup conditions. When the vehicle is stationary with turned wheels, the system modifies the steering angle to reduce windup torque; when motion is detected, it restores the original steering angle. This dynamic adaptation resolves the contradiction between maintaining wheel position and preventing motor overheating.
2Reliability
If the electric motor provides sufficient energy to maintain wheels against windup torque, then steering position is held, but motor overheating occurs and torque production diminishes
Solution Approach 1:
The system preemptively detects windup conditions and adjusts steering angle before excessive torque accumulation occurs. By performing this preliminary action, the system maintains reliable steering functionality while preventing motor torque capability degradation from overheating.
Solution Approach 2:
The system continuously monitors vehicle motion state and steering conditions, using this feedback to dynamically adjust steering angle. This closed-loop feedback mechanism ensures reliable steering operation while preventing motor overheating that would diminish torque capability.
3Measurement precision
If the steering system maintains the wheels at the commanded angle, then positioning accuracy is achieved, but excessive energy consumption occurs leading to motor overheating
Solution Approach 1:
The system preemptively adjusts steering angle to minimize windup torque when the vehicle is stationary, thereby reducing energy consumption while maintaining adequate positioning accuracy. This preliminary energy-saving action prevents motor overheating without completely sacrificing positioning precision.
Solution Approach 2:
The system applies partial correction to the steering angle - not fully maintaining the commanded angle, but adjusting it sufficiently to reduce windup torque and energy consumption. This partial action approach balances positioning accuracy requirements with energy conservation to prevent motor overheating.
Data Source
AI summary
A vehicle includes a steering system. The steering system pivots a wheel of a vehicle to a first road wheel angle relative to a starting position. The steering system pivots the vehicle wheel to a second road wheel angle calculated to reduce a tire windup upon determining that the vehicle is stationary. The steering system pivots the vehicle wheel to a final road wheel angle upon determining that a vehicle motion is either incipient or initiated.