Parking Route Generation with Static Steering Limits
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Solution Overview
Problem
Existing parking assist systems increase processing loads and elongate parking time by repeatedly determining whether to include static steering for each turnabout, especially when the electric power steering temperature exceeds a threshold.
Innovation Solution
A route generation device that calculates a number-of-times upper limit for static steering based on the steering load state and generates a guidance route considering this limit, reducing the need for frequent steering determinations during parking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the parking assist apparatus determines whether to include static steering for each turnabout based on electric power steering temperature, then the steering load is managed appropriately, but the processing load on the microcomputer increases and parking time is elongated
Solution Approach 1:
The patent calculates the number-of-times upper limit for static steering in advance based on the detected electric power steering temperature before parking begins. This preliminary calculation allows the system to determine the maximum allowable static steering operations upfront, eliminating the need for repeated determinations during each turnabout maneuver, thus reducing processing load and parking time while maintaining steering load management
Solution Approach 2:
The patent dynamically adjusts the number-of-times upper limit value based on the real-time temperature of the electric power steering. When the temperature is high, the upper limit is set lower to prevent overheating; when the temperature is low, the upper limit can be higher. This dynamic adjustment allows flexible optimization of parking efficiency while protecting the steering system
2Reliability
If the parking assist apparatus sets the amount of static steering according to electric power steering temperature for each turnabout, then the steering system is protected from overload, but the processing complexity and parking duration increase
Solution Approach 1:
The patent performs the steering load management calculation in advance by determining the number-of-times upper limit based on the current electric power steering temperature before the parking maneuver starts. This preliminary action consolidates the processing complexity into a single initial calculation rather than repeated determinations during each turnabout, simplifying the overall control logic while maintaining steering system protection
3Reliability
If the parking assist apparatus performs repeated determination of static steering inclusion during parking, then the steering load is continuously monitored, but the computation time and parking time increase
Solution Approach 1:
The patent calculates the number-of-times upper limit for static steering in advance based on the detected electric power steering temperature before parking begins. This preliminary calculation allows the system to determine the maximum allowable static steering operations upfront, eliminating the need for repeated determinations during each turnabout maneuver, thus reducing processing load and parking time while maintaining steering load management
Data Source
AI summary
A route generation device includes: a steering loaded state input unit to which a steering loaded state of a vehicle is inputted; a parking slot position input unit to which a position of a parking slot near the vehicle is inputted; a vehicle position input unit to which a position of the vehicle is inputted; a number-of-times-of-static-steering upper limit calculation unit configured to calculate, on the basis of the steering loaded state, a number-of-times-of-static-steering upper limit value up to which static steering of the vehicle can be performed between the position of the vehicle and the position of the parking slot; and a guidance route generation unit configured to generate a guidance route for guiding the vehicle to the parking slot, on the basis of the position of the vehicle, the position of the parking slot, and the number-of-times-of-static-steering upper limit value.