Parking Assist Steering Angle Control for Smooth Cancellation
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Solution Overview
Problem
Existing parking assist systems cause abrupt changes in vehicle behavior when assist is cancelled, leading to user inconvenience due to sudden steering angle returns to neutral, especially during turns.
Innovation Solution
A parking assist system with an electronic control unit that detects available parking areas, calculates guidance paths, and executes steering control to guide the vehicle to a parking target, with the option to maintain or gradually reduce the steering angle at the end of guidance control for a predetermined period to prevent abrupt changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If parking assist is cancelled when vehicle speed exceeds a predetermined value, then safety is improved by preventing excessive speed during automatic parking, but user comfort deteriorates due to abrupt steering angle return to neutral position
Solution Approach 1:
The system performs preliminary action by maintaining the steering angle at its final position for a predetermined period after parking assist cancellation, before gradually returning it to the neutral position. This preliminary holding action prevents abrupt changes in vehicle behavior and improves user comfort while still ensuring safety through timely cancellation.
Solution Approach 2:
The system applies dynamics by transitioning the steering angle control from a static abrupt return to neutral, to a dynamic gradual return process. The steering angle is first held constant, then gradually adjusted over time to the neutral position, creating a smooth transition that maintains user comfort while ensuring safety.
2Device complexity
If steering control is automatically cancelled during guidance, then system control is simplified by ending assist torque, but vehicle behavior stability deteriorates due to sudden steering angle changes
Solution Approach 1:
The system performs preliminary action by maintaining the steering angle at its final position for a predetermined period after parking assist cancellation, before gradually returning it to the neutral position. This preliminary holding action prevents abrupt changes in vehicle behavior and improves user comfort while still ensuring safety through timely cancellation.
Solution Approach 2:
The system applies dynamics by transitioning the steering angle control from a static abrupt return to neutral, to a dynamic gradual return process. The steering angle is first held constant, then gradually adjusted over time to the neutral position, creating a smooth transition that maintains user comfort while ensuring safety.
Data Source
AI summary
A parking assist system includes an electronic control unit. The electronic control unit is configured to detect an available parking area in an area around a vehicle, calculate a parking guidance path for guiding the vehicle from a current position of the vehicle to a parking target position included in the available parking area, execute guidance control for guiding the vehicle to the parking target position by executing at least steering control along the parking guidance path, and, when an end condition for ending guidance is satisfied in the middle of execution of the guidance control, end the guidance control and carry out at least one of steering to keep a steering angle at an end of the steering control for a predetermined period or steering to gradually reduce the steering angle from the steering angle at the end of the steering control toward a neutral position.