Wiper Controller Resistance Variance Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing wiper cycle setting devices have resistance value variances, leading to inconsistent voltage supply and incorrect adjustment of intermittent wipe cycles, requiring burdensome device-specific corrections.
Innovation Solution
A wiper controller that computes position information from output signals using learned values to adjust and correct resistance value variations, ensuring accurate intermittent wipe cycle settings across different devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the resistance value of the resistor circuit is used to control the intermittent wipe cycle, then the wipe cycle can be adjusted according to the knob position, but the resistance value varies between devices (±30% tolerance) causing incorrect adjustment and inconsistent operation
Solution Approach 1:
The system performs preliminary learning to detect the actual resistance value characteristics of each cycle setting device during initial operation or calibration mode. The learning unit stores the detected resistance values and their corresponding knob positions in advance, creating a device-specific reference map before normal operation begins. This preliminary detection and storage of actual device parameters eliminates the need for manual correction and ensures accurate wipe cycle control for each individual device despite manufacturing variations.
Solution Approach 2:
The system changes the control parameter from a fixed reference resistance value to a dynamically adjusted value based on actual device characteristics. The correction unit modifies the relationship between knob position and wipe cycle by applying correction values derived from the learned resistance values. This parameter transformation allows the system to accommodate the ±30% resistance tolerance by adapting the control parameters to each device's actual characteristics rather than relying on nominal values.
2Reliability
If correction is performed for each cycle setting device to account for resistance value variance, then accurate wipe cycle control is achieved, but the processing becomes burdensome and complex
Solution Approach 1:
The cycle setting device performs self-correction by automatically detecting its own resistance value characteristics during a learning phase and storing this information for use during normal operation. The learning unit and correction unit work together to enable the device to self-adjust without external intervention or manual calibration procedures. This self-service approach eliminates the need for burdensome correction processing while maintaining high reliability, as the device autonomously adapts to its own manufacturing variations.
Solution Approach 2:
The system implements a feedback mechanism where the actual resistance values measured from each device are fed back into the control algorithm through the learning and correction units. The correction unit uses this feedback information to adjust the wipe cycle control parameters dynamically. This closed-loop feedback approach automatically compensates for device variations without requiring complex manual correction procedures, thereby maintaining reliability while minimizing operational complexity.
Data Source
AI summary
A controller for controlling a wiper unit including a wiper and an intermittent wipe cycle setting device for setting an intermittent wipe cycle of the wiper. The cycle setting device is set at a plurality of positions respectively corresponding to different intermittent wipe cycles. Further, the cycle setting device has a resistance value, which changes in accordance with each of the positions, and generates an output signal, which is in accordance with the change in the resistance value. The controller computes position information of the intermittent wipe cycle setting device from the output signal by using a learned value. The computer adjusts the learned value in accordance with the computation result of the position information to correct the position information. Accordingly, resistance value variances of the intermittent wipe cycle setting device are automatically corrected.