Electric Vehicle Parking Control Using Creep Torque Adjustment
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Solution Overview
Problem
Eco-friendly vehicles equipped with electric motors face issues during parking, as creep torque can cause collisions with or movement over parking curbs, potentially damaging the driving system and parking brake components.
Innovation Solution
A parking control method that determines a parking situation and applies a creep torque modification coefficient to the electric motor's creep torque, using a sensing unit to detect contact with the parking curb, allowing for variable control of the creep torque to prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If creep torque is applied by the electric motor during parking, then the vehicle can imitate low-speed characteristics of internal combustion engine vehicles, but the vehicle may collide with or run over the parking curb causing damage to the driving system
Solution Approach 1:
The control method applies preliminary anti-action by detecting the parking curb through the sensing unit before the vehicle collides with it, and then controlling the electric motor to reduce or cancel creep torque in advance. This prevents the harmful collision from occurring rather than merely mitigating its effects after damage begins.
Solution Approach 2:
The system employs feedback by using the sensing unit to continuously monitor the vehicle's proximity to the parking curb during parking maneuvers. When the curb is detected, this information is fed back to the control unit, which then adjusts the creep torque accordingly to prevent collision, creating a closed-loop control system.
2Speed
If creep torque is applied by the electric motor during parking, then the vehicle can maintain slow movement control, but the parking curb or driving system may be damaged due to collision
Solution Approach 1:
The system performs preliminary action by detecting the parking curb position before the vehicle reaches it during the parking process. The control unit then proactively adjusts the creep torque to prevent collision, rather than reacting after damage occurs. This advance detection and control adjustment ensures both slow movement control and system reliability.
3Reliability
If a sensing unit is added to detect parking curb contact, then collision damage can be prevented, but device complexity increases
Solution Approach 1:
The sensing unit serves multiple functions: it detects the parking curb position, determines when the vehicle is in contact with the curb, and provides information for controlling creep torque. By making the sensing system multi-functional, the patent reduces the need for separate dedicated components for each function, thereby minimizing the increase in device complexity while achieving reliable damage prevention.
Data Source
AI summary
The present disclosure relates to a vehicle and a parking control method therefor which can prevent a parking curb or a driving system from being damaged during parking due to collision with the parking curb or running over the parking curb according to creep torque imitation by an electric motor in a vehicle equipped with the electric motor. A parking control method includes determining whether a parking situation occurs, applying a creep torque modification coefficient to a creep torque until contact with an object that applies a reaction force to a wheel in a parking direction is sensed to determine a modified creep torque upon determining the parking situation, and variably controlling the creep torque by applying a variable coefficient to the modified creep torque.