SBW Neutral Parking Control for Ignition-Off Parking Situations
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Solution Overview
Problem
In vehicles with shift-by-wire (SBW) transmissions, neutral parking is inconvenient due to differing operating methods across gear selectors and the need for driver intervention even after ignition is off, leading to confusion and inefficiency.
Innovation Solution
A method and system that utilize sensors and a controller to determine when neutral parking is required, output confirmation messages to the driver, and automatically shift the transmission to the neutral gear position upon driver agreement, allowing for convenient neutral parking without requiring the ignition to be turned off.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transmission automatically engages P gear position when ignition is off for safety, then safety is improved, but neutral parking becomes inconvenient and requires multiple operations
Solution Approach 1:
The system automatically detects parking situations using sensors and performs the neutral parking shift without requiring the driver to manually operate the gear selector, making the system serve itself by eliminating the need for driver intervention
Solution Approach 2:
The system uses sensor information to detect when the vehicle is in a parking situation, provides feedback to the driver through output units, and automatically executes the shift to N gear position based on this feedback, creating a closed-loop control system
2Reliability
If multiple operations are required to maintain N gear position after ignition off, then safety is ensured, but driver convenience deteriorates and operation time increases
Solution Approach 1:
The system performs the gear shift to N position automatically during the ignition-off process without requiring the driver to complete multiple subsequent operations, resolving the action in advance before the problem occurs
3Adaptability or versatility
If different operating methods are used for different gear selector types, then adaptability to various selectors is achieved, but ease of operation deteriorates due to lack of intuitive recognition
Solution Approach 1:
The system automatically detects the parking situation and executes the shift without requiring the driver to know or remember different operating methods for different gear selector types, making the system self-sufficient and eliminating the need for driver knowledge of specific operations
Data Source
AI summary
In a vehicle including a shift-by-wire (SBW) transmission which may be parked in the neutral gear position of the transmission, method for controlling parking thereof includes determining whether the vehicle is in a situation in which neutral parking is required according to sensor information, when the vehicle is stopped, outputting first information configured to get a confirmation on whether a driver intends to perform the neutral parking from the driver, when the controller concludes that the vehicle is in the situation in which the neutral parking is required and when a park (P) gear position is input or an ignition of the vehicle is turned off, and controlling the SBW transmission to shift to a neutral (N) gear position, when there is an agreement input as a response to the first information.