Predictive Torque Control for Windshield Wiper Motors
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Solution Overview
Problem
Existing windshield wiping devices respond slowly to changing environmental conditions due to fixed motor torque dimensions, which are designed for worst-case scenarios, leading to inefficient power and torque usage.
Innovation Solution
A control device that adjusts power and torque requirements based on real-time vehicle position, speed, and weather conditions using GPS, navigation, cruise control, and camera systems to predictively manage torque and power needs, considering parameters like travel speed, windshield state, and wiper arm movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the motor is dimensioned for worst-case scenarios to guarantee power and torque requirements, then reliability is improved, but motor size and weight increase
Solution Approach 1:
The patent implements dynamic torque adjustment by dividing the crank's rotary angle range into multiple angle ranges, each with a dedicated maximum torque. The control device dynamically selects the appropriate torque level based on the current angle range, replacing the static worst-case torque dimensioning with an adaptive torque profile that matches actual operational requirements at different positions in the wiping cycle.
Solution Approach 2:
The control device changes the torque parameter dynamically during operation by assigning different maximum torque values to different angle ranges of the motor crank. This parameter change allows the system to operate with lower torque during phases where it is not needed, while maintaining sufficient torque when required, thereby reducing the overall motor size and weight compared to a worst-case dimensioned motor.
2Adaptability or versatility
If the control device responds to environmental conditions in real-time, then adaptability is improved, but response time increases due to multiple parameter checks
Solution Approach 1:
The control device performs preliminary action by proactively adjusting the torque before the wiper system actually needs it. The system divides the crank rotation into angle ranges and pre-assigns maximum torque values to each range, allowing the torque to be adjusted in advance as the crank approaches specific angular positions. This predictive torque management reduces response time compared to reactive adjustments based on continuous environmental sensing.
Data Source
AI summary
The invention relates to a windshield wiping device (1), in particular for a motor vehicle, comprising at least one driving device (2) which can be controlled by a control device (3), said control device (3) controlling a power and torque requirement of the windshield wiping device (1) dependent on at least one or more parameters influencing the power and torque requirement of the driving device (2). The invention is characterized in that the control device (3) has at least parameters for determining the current position of the motor vehicle to reduce the power and torque.