Vehicle Posture Control During Automatic Parking
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Solution Overview
Problem
Existing vehicles capable of automatic parking control do not activate vehicle posture control when driving force is controlled independently of the accelerator pedal operation, leading to potential instability during automatic parking.
Innovation Solution
A vehicle system that includes a controller to calculate and execute vehicle posture control based on a second control accelerator pedal position inversely derived from the vehicle's driving force, allowing posture control to be activated even during automatic parking without user input, and gradually transitions to user-defined settings post-parking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If automatic parking control is executed without accelerator pedal operation, then automation level is improved, but vehicle posture control cannot be activated
Solution Approach 1:
The ECU acts as an intermediary by calculating a virtual accelerator pedal operation amount based on the relationship between accelerator pedal operation amount and driving force. This virtual value serves as a mediator that enables vehicle posture control activation during automatic parking control without requiring actual accelerator pedal input from the user.
Solution Approach 2:
The system performs self-service by autonomously calculating the virtual accelerator pedal operation amount and using it to activate vehicle posture control during automatic parking. The ECU independently determines the appropriate control parameters without external user input, allowing the system to serve itself during the automated parking process.
2Extent of automation
If driving force is controlled independently of accelerator pedal operation during automatic parking, then automation is improved, but vehicle stability control is lost
Solution Approach 1:
The system implements feedback by calculating the virtual accelerator pedal operation amount based on the relationship between accelerator pedal operation amount and driving force. This feedback mechanism allows the vehicle posture control to respond appropriately to driving force changes during automatic parking control, maintaining vehicle stability without requiring direct accelerator pedal input.
3Device complexity
If vehicle posture control is not activated during automatic parking, then system complexity is reduced, but vehicle stability during parking is compromised
Solution Approach 1:
The virtual accelerator pedal operation amount serves as an intermediary that enables vehicle posture control activation without adding complex hardware. By using a calculated virtual value rather than requiring additional sensors or complex mechanical linkages, the system maintains relatively simple device complexity while achieving the reliability benefit of activated posture control during automatic parking.
Data Source
AI summary
The ECU executes TRC for controlling the posture of the vehicle and automatic parking control for parking the vehicle at a target parking position without being based on the vehicle operation of the user. The ECU calculates a user accelerator opening based on the operation amount of the accelerator pedal and a control accelerator opening calculated in reverse from the required driving force of the vehicle.