EV Parking Control Device Dynamics for Charging Alignment
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Solution Overview
Problem
Current vehicle parking systems for electric vehicles require high parking accuracy to maintain efficient non-contact charging, which can cause driver discomfort due to changes in drive torque during alignment, and existing solutions either compromise on efficiency or increase coil size to accommodate positional shifts.
Innovation Solution
A vehicle parking control device that includes a target position specifying unit, a predetermined range setting unit, a judgment unit, and a switching unit to adjust acceleration-OFF-state movement characteristics, such as creep torque and brake hydraulic pressure, based on the vehicle's position and conditions, ensuring accurate parking without driver discomfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the drive torque is reduced to facilitate minute movements during parking alignment, then parking accuracy is improved, but the driver experiences discomfort and stress when operating the accelerator pedal
Solution Approach 1:
The patent applies dynamics by making the drive torque characteristic changeable based on vehicle position. The control device dynamically adjusts the accelerator pedal characteristic to provide reduced drive torque when the vehicle is in the parking alignment range, while maintaining normal characteristics outside this range. This resolves the contradiction by making the system adaptive to operational context rather than fixed.
Solution Approach 2:
The patent applies local quality by providing different drive torque characteristics for different spatial positions of the vehicle. Specifically, the accelerator pedal characteristic is modified only within the parking alignment range (a localized spatial region) while remaining unchanged elsewhere. This allows precise control where needed without affecting overall driving comfort.
2Productivity
If the coil size is increased to maintain charging efficiency with positional shifts, then charging efficiency is improved, but the device complexity and space requirements increase
Solution Approach 1:
The patent applies parameter changes by modifying the drive torque parameter (accelerator pedal characteristic) rather than changing the physical dimensions of the charging coils. This allows the system to compensate for positional shifts through control parameter adjustment instead of increasing hardware size, thereby maintaining charging efficiency without increasing device complexity.
3Ease of operation
If the drive torque is changed during parking alignment, then positional alignment is facilitated, but the vehicle behavior becomes unpredictable on slopes causing driver discomfort
Solution Approach 1:
The patent applies feedback by using the detected vehicle position (relative to the parking alignment range) to continuously adjust the accelerator pedal characteristic. The control device monitors whether the vehicle is within the alignment range and modifies drive torque accordingly, creating a closed-loop system that adapts to real-time conditions while maintaining predictable behavior through systematic control logic.
Data Source
AI summary
At a time that a parking operation is performed, a vehicle parking control device detects that a power receiving pad of an electric vehicle lies within a characteristics modifying range. Furthermore, the vehicle parking control device detects that other predetermined conditions are satisfied. In the case that the power receiving pad is positioned inside of the characteristics modifying range, and if all of the predetermined conditions have been satisfied, an acceleration-OFF-state movement characteristic of the vehicle, for example, a creep torque characteristic or a brake hydraulic pressure characteristic, is switched to an appropriate characteristic from a characteristic thereof at normal times.