Automatic Steering Control Device Non-Sinusoidal Waveform
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Solution Overview
Problem
Automatic steering control systems cause discomfort due to periodic sway of vehicles while maintaining a target course, as the steering angle waveform typically follows a sinusoidal pattern, which is not comfortable for occupants.
Innovation Solution
The system incorporates a road information recognition device and a travel state detector to control the steering angle, allowing at least a portion of the steering angle waveform to become non-sinusoidal, thereby alleviating discomfort by modifying the steering angle control to include linearized crests and troughs within predetermined times, and adjusting the correction control time based on vehicle speed and lane curvature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the steering angle is controlled to follow a sinusoidal waveform for maintaining target course, then the vehicle can travel along the target course, but the occupants experience discomfort due to periodic sway
Solution Approach 1:
The patent applies periodic action by intentionally introducing irregular periodic variations to the steering angle waveform. Instead of using a regular sinusoidal waveform, the system generates a steering angle waveform with varying periods and amplitudes that disrupt the regular periodic sway pattern, thereby reducing occupant discomfort while maintaining course stability
Solution Approach 2:
The patent changes the parameters of the steering angle waveform by varying its amplitude and period dynamically. The control device adjusts the steering angle waveform parameters based on vehicle speed and other conditions, transforming the fixed sinusoidal pattern into a variable waveform that prevents regular periodic motion and reduces discomfort
2Object-affected harmful factors
If the steering angle waveform amplitude is reduced to minimize sway, then occupant comfort improves, but the vehicle's ability to correct positional deviations may be compromised
Solution Approach 1:
The patent applies dynamics by making the steering angle waveform adaptive and dynamic rather than static. The control device continuously adjusts the waveform characteristics based on real-time vehicle position feedback, speed, and road conditions, ensuring that the system maintains sufficient correction capability while minimizing discomfort under varying operating conditions
3Device complexity
If the steering angle control uses simple sinusoidal waveform, then the control system is simple, but the system cannot prevent periodic sway that causes discomfort
Solution Approach 1:
The patent applies feedback by using a control device that receives position information from a position information acquisition device and continuously adjusts the steering angle waveform accordingly. This feedback mechanism allows the system to maintain course accuracy while dynamically modifying the waveform to reduce periodic sway and occupant discomfort
Data Source
AI summary
An automatic steering control apparatus includes a road information recognition device, a travel state detector, and a steering angle control device. The road information recognition device recognizes road information ahead of a vehicle. The travel state detector detects information regarding a travel state of the vehicle. The steering angle control device controls a steering angle of the vehicle, on the basis of the road information and the information regarding the travel state, to allow the vehicle to move toward a target position ahead of the vehicle. The steering angle control device controls the steering angle, to allow at least a portion of a steering angle waveform to have a non-sinusoidal wave. The steering angle waveform represents a time change in the steering angle in a case where the vehicle travels while crossing repetitively an ideal travel locus to be obtained from the target position.