Automatic Steering Control Cancellation Logic
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Solution Overview
Problem
Conventional automatic vehicle steering systems tend to cancel steering control easily, especially when the steering actuator's output is insufficient, leading to deviations in steering angle and potential overheating issues, making the automatic parking function difficult for drivers to use.
Innovation Solution
A vehicle steering system that includes a steering actuator, an automatic steering controller, a steering angle detection unit, a deviation determination device, and an automatic steering cancellation unit, which continues the automatic steering control when the steering angle deviation exceeds a threshold due to actuator output shortages, and cancels it when the deviation is not caused by the actuator's output shortage, allowing for proper handling of automatic steering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the automatic steering control is cancelled when steering angle deviation exceeds a threshold, then the system reliability is improved, but the ease of operation deteriorates
Solution Approach 1:
The system dynamically changes the threshold parameter for steering angle deviation based on the determined cause. When output shortage is identified as the cause, a first (higher) threshold is applied, allowing the control to continue. When other causes are identified, a second (lower) threshold is applied, leading to control cancellation. This parameter adaptation resolves the contradiction by adjusting the cancellation criterion based on the specific situation.
2Ease of operation
If the automatic steering control continues when steering angle deviation exceeds a threshold, then the ease of operation is improved, but the reliability deteriorates
Solution Approach 1:
The system changes the threshold parameter based on the determined cause of deviation. When output shortage is the cause, a higher threshold allows control continuation, improving ease of operation. When other causes are present, a lower threshold triggers cancellation, maintaining reliability. This dynamic parameter adjustment resolves the contradiction.
Solution Approach 2:
The system uses feedback from the cause determination process to adjust the threshold application. The feedback loop determines whether output shortage is the cause of deviation and accordingly applies different threshold criteria, enabling the system to maintain reliability while improving ease of operation under appropriate conditions.
3Manufacturing precision
If the steering actuator operates at maximum output to follow target steering angle, then the manufacturing precision is improved, but the loss of energy increases
Solution Approach 1:
The system changes the operational parameters by adjusting the threshold for control continuation based on the cause of deviation. When output shortage is identified, the system allows continued operation with adjusted expectations, reducing energy consumption while maintaining acceptable steering precision. This resolves the contradiction between achieving precise steering angles and minimizing energy loss.
Data Source
AI summary
An automatic parking control is cancelled when a motor current has not yet reached a maximum current value Imax with a steering angle deviation exceeding a deviation threshold value. In addition, the automatic parking control is cancelled when a steering speed has not yet reached a maximum steering speed with a state where the motor current has reached and remains at the maximum steering speed continuing over a first time period. On the other hand, when a state where the steering speed has reached and remains at the maximum steering speed continues over a second time period, it is determined that there occurs an output shortage of a steering actuator, an automatic parking condition is recalculated, so as to allow the automatic parking continue to continue.