Adaptive Window Motor Speed Control for High-Speed Closure
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Solution Overview
Problem
Existing power window control systems fail to ensure full closure of vehicle windows at high speeds due to reduced motor rotational speed, leading to incomplete sealing and increased load on the window glass.
Innovation Solution
A closure panel control apparatus that adjusts the drive speed of the window glass by reducing the rotational speed of the electric motor only when the window reaches a predetermined speed reduction point near full closure, taking into account the vehicle speed to counteract increased loads at higher speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the motor rotational speed is reduced at the speed reduction start point regardless of vehicle speed, then vibrations and noises are reduced, but the window glass cannot be fully closed at high vehicle speeds due to increased load
Solution Approach 1:
The patent applies dynamics by making the speed reduction timing adaptive rather than fixed. The control device dynamically adjusts when to reduce motor speed based on real-time vehicle speed feedback. At higher vehicle speeds, the speed reduction start point is delayed (window glass position is lower), allowing the motor to maintain high rotational speed longer to overcome the increased aerodynamic load on the window glass, ensuring full closure while still reducing speed near the end to minimize vibrations and noises.
Solution Approach 2:
The patent changes the parameter of speed reduction timing based on vehicle speed conditions. Instead of using a fixed position-based speed reduction strategy, the system adjusts the speed reduction start point position as a variable parameter that depends on vehicle speed. This parameter change allows the motor to compensate for increased load at high speeds while maintaining the benefit of speed reduction for noise and vibration control near closure.
2Reliability
If the motor has high torque to drive the window glass under various conditions, then the window can be driven reliably, but controlling the rotational speed becomes necessary to avoid vibrations and noises
Solution Approach 1:
The patent implements feedback control by using a vehicle speed detection device to continuously monitor vehicle speed and feeding this information back to the control device. The control device then adjusts the motor rotational speed based on this feedback, automatically adapting to different operating conditions. This feedback mechanism simplifies the control operation compared to manual speed regulation while ensuring reliable window closure across various vehicle speeds and conditions.
3Speed
If the vehicle speed is increased, then the vehicle performance is improved, but the load pulling the window glass toward the outside is increased, making full closure difficult
Solution Approach 1:
The patent applies the counterweight principle by using the motor to generate a counteracting force that balances the aerodynamic load on the window glass at high vehicle speeds. By detecting vehicle speed and adjusting motor rotational speed accordingly, the system creates an opposing force that compensates for the increased outward pull on the window glass, enabling full closure even at high speeds where the aerodynamic load would otherwise prevent proper sealing.
Data Source
AI summary
In a closure panel control apparatus, an ECU controls a rotational speed of an electric motor, which provides a drive force to drive a closure panel in an opening movement and a closing movement thereof. The ECU obtains a vehicle speed measured with a vehicle speed sensor and receives a command signal from a switch, which is operable by an occupant of a vehicle to command the opening movement or the closing movement of the closure panel. The ECU controls the rotational speed of the electric motor based on the measured vehicle speed that is obtained at the time of receiving the command signal from the switch.