Temperature Adjustment Circuit Pump Speed Control for Switching Thrust
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing temperature adjustment circuits for electric vehicles face increased load and manufacturing costs due to excessive thrust requirements on switching units when switching from non-circulation to circulation states, leading to potential size and cost issues.
Innovation Solution
A temperature adjustment circuit with a control device that decreases the rotation speed of the first pump before switching from non-circulation to circulation states and increases it afterwards, along with an electromagnetic valve to bypass the switching unit, reducing the thrust needed for operation and preventing cost and size increases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the switching unit switches from non-circulation state to circulation state with pump running at normal speed, then the temperature adjustment circuit can provide effective heat medium circulation, but excessive load and thrust are applied on the switching unit causing increased size and manufacturing cost
Solution Approach 1:
The control device decreases the rotation speed of the pump before switching the switching unit from non-circulation state to circulation state. This preliminary action reduces the pressure differential across the switching unit, thereby reducing the thrust required for switching and preventing excessive load on the switching unit while maintaining reliable operation
2Reliability
If the switching unit is designed to handle excessive thrust, then switching reliability is improved, but the size and manufacturing cost of the switching unit increases
Solution Approach 1:
The control device dynamically changes the rotation speed parameter of the pump based on the switching state. By decreasing the pump rotation speed before switching to circulation state and increasing it after switching, the system maintains reliable switching operation while allowing the use of a smaller, more cost-effective switching unit design
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
This approach stabilizes the switching process, prevents thrust increases, and maintains heat radiation performance by adjusting pump speeds and fan air volumes, thereby reducing manufacturing costs and component size.
Implementation Method 1
a first temperature adjustment circuit configured to exchange heat with a battery; a second temperature adjustment circuit configured to exchange heat with at least one of a motor and a power conversion device
Implementation Method 2
a first pump configured to circulate a heat medium in at least one of the first temperature adjustment circuit and the second temperature adjustment circuit
Data Source
AI summary
A temperature adjustment circuit includes a first pump that circulates a heat medium in at least one of a first temperature adjustment circuit and a second temperature adjustment circuit; a coupling path that couples the first temperature adjustment circuit and the second temperature adjustment circuit to form a coupled circuit; a switching unit capable of switching between a circulation state in which the heat medium circulates in the coupled circuit and a non-circulation state in which the heat medium does not circulate in the coupled circuit; and a control device that controls the switching unit and the first pump. The control device switches the coupled circuit from the non-circulation state to the circulation state in a state in which a rotation speed of the first pump is decreased lower than a rotation speed of the first pump before switching, and increases the rotation speed of the first pump after switching.