Wiper Motor Control via Smart ECW Module and Variable PWM
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Solution Overview
Problem
Conventional wiper motor control systems have precision control limitations due to mechanical contact-based operation, leading to noise and limited wiping performance, and existing solutions like PWM control are costly and require new system development.
Innovation Solution
A wiper motor control system that improves the plate structure of the wiper motor and monitors the parking switch state using a smart ECW module with a micro-control unit, enabling variable PWM control based on the switch's sections to reduce noise and enhance performance, and allows remote wireless control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If mechanical contact-based operation is used to control wiper motor, then the system structure is simple, but precision control is limited and noise is generated
Solution Approach 1:
The patent replaces the mechanical contact-based control system with an electronic control system. The electronic control unit receives signals from the parking switch and controls the wiper motor through electronic switching devices, eliminating the need for mechanical contacts. This substitution enables precise speed control while reducing mechanical noise and improving reliability.
Solution Approach 2:
The patent implements variable speed control by changing the electrical parameters supplied to the wiper motor. The electronic control unit adjusts the voltage or current parameters based on the detected parking switch state, enabling the wiper blade to operate at different speeds for different sections (upper, middle, lower) of the windshield, thereby achieving precision control without complex mechanical structures.
2Device complexity
If mechanical contact-based operation is used to control wiper motor, then the system structure is simple, but operational noise is generated
Solution Approach 1:
The patent eliminates mechanical contacts by replacing them with electronic switching devices controlled by an electronic control unit. This substitution removes the source of mechanical arcing and contact noise, significantly reducing operational noise while maintaining system functionality.
Solution Approach 2:
The patent introduces an electronic control unit as an intermediary between the parking switch and the wiper motor. This intermediary processes the switch signals and controls the motor through electronic means, eliminating direct mechanical contact and the associated noise generation.
3Manufacturing precision
If PWM control is used to control wiper motor speed, then speed control precision is improved, but system cost increases
Solution Approach 1:
The patent utilizes the existing parking switch structure and its internal circuitry to generate the control signals needed for PWM modulation. The electronic control unit leverages the available switch states (B+, GND, OPEN sections) to derive timing and duty cycle information, eliminating the need for separate sensors or complex control circuits that would increase system cost.
Solution Approach 2:
The patent makes the existing parking switch serve multiple functions: it not only controls the basic on/off operation of the wiper motor but also provides the timing reference and control signals for PWM speed regulation. This multi-functionality reduces the need for additional components and keeps the system cost-effective while achieving precise speed control.
4Device complexity
If constant speed operation is used in wiper motor, then the control system is simple, but wiping performance is limited
Solution Approach 1:
The patent transitions from constant speed operation to dynamic speed control. The electronic control unit continuously adjusts the wiper motor speed based on the position and state of the parking switch, enabling the wiper blade to operate at optimal speeds for different sections of the windshield. This dynamic adaptation significantly improves wiping performance by matching the speed to the specific wiping requirements of each area.
Solution Approach 2:
The patent changes the operational parameters of the wiper motor from a fixed constant speed to variable speeds. By adjusting the electrical parameters supplied to the motor based on the detected switch state, the system achieves differentiated speed control for upper, middle, and lower sections, thereby enhancing overall wiping effectiveness without requiring a fundamentally complex control architecture.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system reduces operational noise, improves wiping performance by maintaining differentiated speeds, and provides remote control convenience while being economically efficient by utilizing internal circuitry and existing linkage structures.
Implementation Method 1
some of advanced companies control a wiper motor speed with a pulse width modulation (PWM) control in order to overcome some of the disadvantages of the conventional the wiper device
Data Source
AI summary
The present disclosure provides a wiper motor control system for a vehicle, which precisely controls the speed of the wiper motor to improve the wiper performance. The present disclosure implements a wiper motor control method in a new form, which precisely controls a speed of the wiper motor for each section through a scheme of improving a plate structure of the wiper motor and monitoring a state of a parking switch, and thus reduces a noise generated in an operation of a wiper device and increases the wiping performance through a differentiated speed for each section, which generally improves the wiper performance. More specifically, the present disclosure implements a smart ECW (Electric Control Wiper) control module inputting a remote control by a wireless transmitter, so that a driver can wirelessly control a wiper before getting into a vehicle, which makes the driver feel convenience and induces the driver to safely drive.