EV Coolant Module Pump Speed Control for Quiet Valve Switching
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Solution Overview
Problem
Conventional electric water pumps in electric vehicles generate noise and vibration due to unstable coolant flow paths when changing directions, affecting durability and passenger comfort.
Innovation Solution
A coolant module system with a coolant pump and valve that controls coolant flow in multiple directions, and a control unit that regulates the pump's speed to a preset RPM during mode changes to stabilize the flow path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the electric water pump operates at high speed to maintain coolant flow rate, then cooling performance is improved, but noise and vibration increase when coolant flow path direction changes
Solution Approach 1:
The control unit dynamically adjusts the operational speed of the electric water pump based on the coolant valve mode. When the coolant valve mode changes (causing dramatic flow path changes), the control unit reduces the pump speed to a preset RPM or lower to minimize noise and vibration. When the valve mode is stable, the pump speed is maintained at normal operational levels to ensure adequate coolant flow rate for cooling performance.
Solution Approach 2:
The control unit detects changes in coolant valve mode and proactively adjusts the electric water pump speed before significant noise and vibration occur. By monitoring the valve mode and anticipating flow path changes, the system preemptively reduces pump speed to prevent harmful vibrations and noise, rather than reacting after they occur.
2Object-affected harmful factors
If the electric water pump speed is reduced to minimize noise and vibration during mode change, then noise and vibration are reduced, but coolant flow rate decreases
Solution Approach 1:
The system implements dynamic speed control where the electric water pump operational speed is adjusted in real-time based on coolant valve mode. During mode transitions when noise and vibration occur, the pump speed is temporarily reduced to a preset RPM or lower. Once the mode change is complete and flow path stability is restored, the pump speed is increased back to normal operational levels to maintain adequate coolant flow rate for cooling performance.
Solution Approach 2:
The control unit implements periodic adjustment of pump speed corresponding to the periodic nature of valve mode changes. The pump speed is reduced during brief transition periods when the valve mode changes, and maintained at normal levels during stable operation periods. This periodic speed adjustment ensures noise and vibration are minimized during transitions while cooling performance is maintained during stable operation.
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
Reduces noise and vibration by stabilizing coolant flow paths during mode changes, maintaining efficient cooling performance without stopping the pump.
Implementation Method 1
a coolant pump configured to press and transfer a coolant
Implementation Method 2
a coolant valve configured to control a flow of the coolant in a plurality of directions
Data Source
AI summary
A coolant module system and a method for controlling the coolant module system for an electric vehicle. The coolant module system includes a coolant pump configured to press and transfer a coolant; a coolant valve configured to control a flow of the coolant in a plurality of directions; and a control unit configured to control operations of the coolant pump and the coolant valve and to control an operational speed of the coolant pump to be equal to or below a preset RPM (revolutions per minute) when a mode of the coolant valve is changed.