MDPS Steering Angle Acceleration Threshold for Emergency Maneuvers
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Solution Overview
Problem
Existing autonomous driving systems in vehicles are not designed to handle emergency situations effectively, often canceling autonomous driving mode during urgent steering, which can lead to dangerous situations for the driver and increase the risk of accidents.
Innovation Solution
An MDPS system control apparatus and method that includes an autonomous driving cancellation determination unit and a signal processing unit to differentiate between intended and unintended steering, allowing urgent steering while maintaining autonomous driving mode by using a band stop filter, differentiators, LPF, gain adjusting unit, and variable HPF to prevent cancellation during emergency situations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If autonomous driving mode is canceled during urgent steering, then driver safety is improved, but responsiveness to emergency situations deteriorates
Solution Approach 1:
The system changes the parameter of autonomous driving mode cancellation based on steering angle acceleration thresholds. When steering angle acceleration exceeds the threshold, the system determines urgent steering is occurring and maintains autonomous driving mode. When below the threshold, the system allows autonomous driving cancellation. This dynamic parameter adjustment resolves the contradiction by adapting the cancellation decision to the emergency situation severity.
2Speed
If autonomous driving mode is maintained during urgent steering, then responsiveness to emergency situations is improved, but driver safety deteriorates
Solution Approach 1:
The system uses feedback from steering angle sensors and acceleration calculations to continuously monitor steering behavior. The steering angle acceleration is calculated in real-time and fed back to the autonomous driving cancellation determination unit, which adjusts the autonomous driving mode status accordingly. This feedback mechanism enables the system to maintain autonomous driving during genuine emergencies while canceling it during normal urgent steering, thus resolving the safety contradiction.
3Speed
If steering angle acceleration threshold is set low, then responsiveness to emergency situations is improved, but false detection of urgent steering increases
Solution Approach 1:
The system dynamically adjusts the steering angle acceleration threshold based on vehicle operating conditions such as speed, road surface, and turning radius. The threshold is not fixed but adapts to current driving conditions, allowing lower thresholds during high-speed straight-line driving where urgent steering is more likely emergency, and higher thresholds during low-speed maneuvering where false emergencies are more likely. This dynamic thresholding resolves the contradiction between responsiveness and detection accuracy.
Data Source
AI summary
An apparatus for controlling an MDPS system including: an autonomous driving cancellation determination unit configured to determine whether to cancel autonomous driving, using column torque passed through a band stop filter, under an autonomous driving condition; and a signal processing unit configured to calculate command steering angle acceleration information using command steering angle information outputted from an autonomous driving system. When the steering angle acceleration information is equal to or greater than a predetermined reference value, the autonomous driving cancellation determination unit may determine that urgent steering is performed by the autonomous driving system, and forbid cancellation of the autonomous driving.