Steering Haptic Feedback Tuning for Automated Lateral Control
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Solution Overview
Problem
Existing driver assistance systems for automated lateral vehicle guidance often provide haptic feedback on the steering wheel that varies in feel depending on the driving function, leading to uncertainty and discomfort for the driver.
Innovation Solution
Adapt the feedback signal and adjustment parameters to ensure consistent perception of haptic feedback across different driving functions by adjusting the accuracy and rigidity of the steering actuator, and using ramp-in and ramp-out phases to seamlessly integrate the feedback with the driving experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If haptic feedback is output on the steering wheel during automated lateral guidance, then the driver receives tactile information about the system's actions, but the perception of the haptic feedback varies depending on the driving function, leading to uncertainty and discomfort
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting control parameters of the steering actuator based on the current driving function. When haptic feedback is to be output, the system modifies parameters such as the proportional gain, differential gain, and integral gain of the PID controller to ensure that the haptic feedback perception remains consistent across different driving functions. This resolves the contradiction by changing the system parameters adaptively to maintain reliability while ensuring driver comfort.
2Adaptability or versatility
If different adjustment parameters are specified for different driving functions, then the control system can be optimized for each function, but the haptic feedback perception becomes inconsistent across functions
Solution Approach 1:
The patent applies dynamics by making the control parameters dynamic rather than static. The system automatically switches between different parameter sets depending on the current driving function and the state of automated lateral guidance. When automated guidance is active and haptic feedback is requested, the system transitions to a specific parameter configuration that ensures consistent haptic perception. This dynamic adaptation resolves the contradiction by allowing versatility in different driving functions while maintaining reliability through context-dependent parameter selection.
Solution Approach 2:
The system uses feedback mechanisms to determine when to output haptic feedback and which parameters to apply. The control unit monitors the current driving function and the state of automated lateral guidance, and based on this feedback, selects appropriate adjustment parameters. This feedback loop ensures that the haptic feedback perception remains consistent across different driving functions while still allowing optimization for each function's specific requirements.
3Productivity
If the steering actuator provides automated lateral guidance, then the vehicle can be guided centrally in the lane, but the driver may perceive unintended steering movements when haptic feedback is output
Solution Approach 1:
The patent applies preliminary anti-action by preemptively adjusting the control parameters before outputting haptic feedback. When the system determines that haptic feedback should be output, it first modifies the adjustment parameters to compensate for the potential unintended steering movements that would otherwise be perceived by the driver. This preliminary adjustment prevents the harmful effect of perceived unintended movements while maintaining the productivity of automated lateral guidance.
Solution Approach 2:
The system changes parameters dynamically to prevent the driver from perceiving unintended steering movements. By adjusting the proportional gain, differential gain, and integral gain parameters based on the current driving function and the need to output haptic feedback, the system ensures that the steering actuator's responses are consistent with the driver's expectations. This parameter change approach resolves the contradiction by maintaining automated guidance performance while eliminating harmful perceptual effects.
Data Source
AI summary
A method for operating a control system for the automated lateral guidance of a vehicle includes determining a target variable for the automated lateral guidance of the vehicle, determining a manipulated variable for a steering actuator by a controller device, adapting adjustment parameters, which describe a controlled variable of the controller device and/or an output from the steering actuator, for different driving functions of the vehicle, receiving a request signal to output haptic feedback on a steering wheel of the vehicle, outputting a feedback signal for adapting the target variable for the output of the haptic feedback on the steering wheel during the automated lateral guidance of the vehicle, and adapting the feedback signal and/or the adjustment parameters during the output of the haptic feedback in such a manner that perception of the haptic feedback by a driver is the same irrespective of the driving function of the vehicle.