Parking Assist Steering Control for Simplified Reverse Entry
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Solution Overview
Problem
Existing parking assist systems face complexity in transition control during automatic parking, particularly in turning and accelerating the vehicle, and require complicated calculations for guiding routes due to varying positional relationships between the vehicle and parking spaces.
Innovation Solution
A parking assist system that includes an environment information obtainer and a parking assist controller, which detects available parking spaces, sets a target guiding route, and controls steering and acceleration to simplify the transition process, using sensors and cameras to gather data for precise vehicle positioning and route planning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If the vehicle temporarily stops at the turning position and executes simultaneous transition control for turning the steered wheel and accelerating the vehicle, then the automatic parking can be completed, but the control operation becomes complicated
Solution Approach 1:
The patent divides the automatic parking process into distinct phases: a first phase where the vehicle moves forward to a turning position, and a second phase where the vehicle reverses into the parking space. By segmenting the process, the control operations are separated - the steered wheel is turned during the first phase, and acceleration control is executed during the second phase, avoiding the complexity of simultaneous control.
Solution Approach 2:
The patent performs preliminary actions in sequence: first, the vehicle moves forward to position itself at a turning position and turns the steered wheel to the appropriate angle. Only after this preliminary positioning is complete does the system execute the reversal and acceleration control. This preliminary action approach simplifies the overall control by preparing the system in advance rather than managing multiple transitions simultaneously.
2Adaptability or versatility
If the guiding route is calculated based on the current position of the vehicle, then the route can be adapted to different positions, but the calculation becomes complicated due to varying positional relationships
Solution Approach 1:
The patent changes the reference parameter for route calculation from the vehicle's current position to a fixed turning position. By defining the guiding route from this fixed point to the parking space, the calculation becomes standardized and simpler. The system determines the appropriate turning angle at this fixed position and calculates the route accordingly, rather than recalculating based on varying current positions.
Solution Approach 2:
The patent introduces a fixed turning position as an intermediary point between the vehicle's current position and the parking space. This intermediary serves as a standardized reference point for route calculation, simplifying the mathematical computations by providing a consistent origin point regardless of where the vehicle starts from.
3Manufacturing precision
If the vehicle uses a smallest steering angle for reversing, then the alignment with parking space can be achieved, but the reversing distance may increase
Solution Approach 1:
The patent performs preliminary steering angle adjustment during the forward movement phase. Before the vehicle begins reversing, the steered wheel is turned to the optimal angle at the turning position. This preliminary action allows the vehicle to utilize the smallest necessary steering angle during reversal, improving alignment precision while minimizing the reversing distance, as the vehicle is already positioned and oriented correctly before the reversal begins.
Data Source
AI summary
A parking assist system includes an environment information obtainer and a parking assist controller. The parking assist controller includes an available parking space detector, a target guiding route setter, a target stop position setter, and a steering controller. The steering controller turns a steered wheel of a vehicle and fixes the steered wheel to a steering angle at which the vehicle starts to be reversed at a target stop position for turning the vehicle along a target guiding route. The steering controller also turns the steered wheel to a steering angle at which the vehicle starts to be reversed to an available parking space at a target stop position for parking the vehicle in a state in which the vehicle is in line with the available parking space.