Shift-by-Wire Parking Release Control Method for Anti-Theft
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Solution Overview
Problem
Shift-by-wire vehicles face challenges in preventing inappropriate manual release of the parking state, which can lead to unauthorized operation or robbery, especially when there are issues with the electric system, such as discharge, and require a mechanical mechanism to switch between P-stage and N-stage states.
Innovation Solution
A control method for the parking release apparatus that determines abnormal manual releasing attempts by monitoring movement in the parking cable's display parts, uses a braking circuit to prevent motor rotation, and includes reverse control and alarm functions to ensure the parking state is maintained and alert for potential issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a mechanical mechanism is provided to manually switch between P-stage and N-stage states, then the vehicle can be operated when electric system problems occur, but the tool hole may be used to rotate the worm wheel for fun or robbery, creating a security risk
Solution Approach 1:
The controller monitors the rotation direction of the worm wheel and compares it with the current gear stage. If the rotation direction does not match the expected direction for the current stage (e.g., rotating in N-stage direction when in P-stage), the controller determines this is an abnormal attempt and activates the braking circuit to prevent the shift, thereby blocking unauthorized operation before it can complete
2Reliability
If the parking release apparatus allows manual operation, then switching between P-stage and N-stage is possible during electric failures, but inappropriate operation can lead to unauthorized release of parking state
Solution Approach 1:
The rotation sensor continuously provides feedback about the worm wheel's rotation direction to the controller. The controller processes this feedback by comparing the detected rotation direction with the expected direction for the current gear stage, and based on this feedback analysis, determines whether to allow or block the shift operation through the braking circuit
3Object-affected harmful factors
If a braking circuit is used to prevent motor rotation during abnormal attempts, then unauthorized release is prevented, but the system complexity increases
Solution Approach 1:
The braking circuit serves multiple functions: it acts as a motor brake to prevent unauthorized shifts, serves as a safety mechanism for abnormal conditions, and works in conjunction with the rotation sensor and controller to provide intelligent monitoring. This multi-functionality justifies the added component while providing comprehensive protection
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances vehicle safety and prevents unauthorized operation by preventing abnormal manual release of the parking state, improving commercial value by ensuring secure switching between P-stage and N-stage states even during electric system failures.
Implementation Method 1
uses a braking circuit to prevent motor rotation
Data Source
AI summary
A control method for a parking release apparatus of a shift-by-wire shifting device can improve the commercial value of a vehicle by improving safety of the vehicle and preventing robbery, by interfering with or preventing an attempt of abnormally and manually releasing a parking state of the vehicle when there is no problem in the electric system of the vehicle, using a part provided to be manually operated in the parking release apparatus such that a P-stage state and an N-stage state can be manually switched when a problem, such as discharge, occurs in the electric system, in the vehicle equipped with a shift by wire apparatus.