Power Window Motor Control for Lower Entrapment Load
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Solution Overview
Problem
Existing opening/closing member control devices, such as power window systems, face issues with increased entrapment load when entrapment is detected due to delayed determination and subsequent increase in drive voltage to counteract load fluctuations.
Innovation Solution
The control device maintains a prestored drive voltage to the motor until entrapment is determined, regardless of load fluctuations, and adjusts the drive voltage based on outside air temperature to maintain consistent speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If feedback control is used to maintain constant drive speed by varying drive voltage, then drive speed stability is improved, but entrapment load increases when entrapment is detected
Solution Approach 1:
The control device determines entrapment occurrence before actively responding to load fluctuations. By using a determination unit that monitors load information and decides entrapment status in advance, the system avoids unnecessary drive voltage increases that would occur if feedback control continuously adjusted voltage in response to normal load variations. This preliminary determination allows the system to distinguish between normal load fluctuations and actual entrapment conditions.
Solution Approach 2:
The control device uses feedback control to supply drive voltage based on monitored load information, but modifies the traditional feedback approach by incorporating an entrapment determination step. The feedback loop includes a determination unit that analyzes load information to decide whether entrapment has occurred before adjusting drive voltage, preventing unnecessary voltage increases during normal operation while still maintaining speed stability when needed.
2Speed
If drive voltage is increased to counteract load fluctuations, then drive speed stability is maintained, but entrapment load increases
Solution Approach 1:
The control device performs entrapment determination before responding to load fluctuations. By using a determination unit that analyzes load information in advance and decides whether entrapment has occurred, the system avoids prematurely increasing drive voltage in response to normal load variations. This preliminary assessment ensures that drive voltage is only increased when actual entrapment is confirmed, not during routine operational fluctuations.
Solution Approach 2:
The control device changes the parameter of drive voltage supply based on entrapment determination results. When the determination unit identifies that entrapment has occurred, the control unit adjusts drive voltage accordingly. When entrapment is not determined, normal drive voltage supply continues despite load fluctuations, avoiding unnecessary parameter changes that would increase entrapment load.
3Reliability
If entrapment determination is delayed, then false positives from load fluctuations are reduced, but response time to actual entrapment increases
Solution Approach 1:
The control device performs entrapment determination as a preliminary step before active response. The determination unit continuously monitors load information and decides entrapment status in advance, allowing the system to be ready to respond immediately when entrapment is confirmed. This preliminary determination approach ensures both accuracy (by thorough assessment) and quick response (by having the decision ready before active intervention is needed).
Solution Approach 2:
The control device uses continuous feedback monitoring of load information with a determination unit that processes this information to decide entrapment status. The feedback loop provides real-time information about load conditions, and the determination unit analyzes this feedback to make timely and accurate entrapment decisions, balancing detection accuracy with response time.
Data Source
AI summary
An opening/closing member control device includes a control section configured to control a motor for opening and closing an opening/closing member and determine whether an entrapment occurs when closing the opening/closing member. The control section is further configured to supply a prestored drive voltage to the motor when closing the opening/closing member, and maintain supply of the prestored drive voltage until it is determined that an entrapment has occurred, even if the acquired load information fluctuates.