Power Window Control Apparatus Position Tracking
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Solution Overview
Problem
Existing power window control systems for vehicles often misidentify the current position of the window glass after a power supply interruption, leading to unnecessary relearning of the origin position and potential operational issues.
Innovation Solution
A control apparatus and method that includes a drive motor, position detection means, storage means, and determination means to write and read position information into an electrically rewritable ROM, allowing the system to identify the current position of the window glass upon power restoration and determine if relearning is necessary based on the stored information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the controller writes position information into the ROM after power supply interruption during motor operation, then the position information stored is inaccurate, but if the controller waits for motor stoppage to write position information, then the system responds slower to power restoration
Solution Approach 1:
The controller performs preliminary determination of whether motor operation was in progress at the time of power interruption. By checking the motor operation state flag before power restoration, the controller can proactively identify when relearning is necessary, avoiding delays while ensuring accurate position reconstruction only when needed.
2Reliability
If the controller performs relearning of the origin position for all power supply interruptions, then the system ensures accurate position tracking, but the operation becomes unnecessarily complicated and frequent
Solution Approach 1:
The controller uses feedback from the motor operation state flag to determine whether relearning is necessary. By continuously monitoring and recording the motor operation state at the moment of power interruption, the controller can accurately identify when position information has become invalid, triggering relearning only in those specific cases and avoiding unnecessary operations during normal stoppage scenarios.
3Measurement precision
If the controller continuously monitors motor operation state to determine relearning necessity, then the system accurately identifies when relearning is needed, but the device complexity increases
Solution Approach 1:
The controller utilizes its existing motor operation state detection capability to automatically determine when relearning is necessary. The system serves itself by using the same operational information it already collects for motor control to make intelligent decisions about position reconstruction, eliminating the need for additional complex monitoring systems or external intervention.
Data Source
AI summary
A controller writes position information (count value) of the window glass into an EEPROM based on halting of operation of a drive motor and identifies the current position of the window glass based on the position information of the window glass written in the EEPROM at the start of power supply. The controller determines whether the current position of the window glass has been lost or not at the start of power supply. Only when the controller determines that the current position of the window glass has been lost at the start of power supply, the controller shifts to a mode of performing relearning of the origin position for matching the position of the window glass with the position of the window glass corresponding to the position information written into the EEPROM.