Modular Thermal Chamber for Precise Drive Unit Testing

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Solution Overview

Problem

Current drive unit thermal testing methods for electric vehicles are inefficient and costly, particularly at the component level, due to the use of complex and expensive walk-in thermal chambers or inefficient foam box setups that consume energy and fail to provide accurate results.

Innovation Solution

A modular thermal chamber system is designed to enclose the drive unit assembly, with integrated load units, torque meters, and thermal devices outside the chamber, utilizing a radiator and chiller system for precise temperature control, and featuring a compact, easily assembled structure with insulation and sealing to minimize energy loss.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a walk-in thermal chamber is used for drive unit testing, then the testing can be performed under extreme temperature conditions, but the testing cost and space requirement increase significantly

Engineering Contradiction:

Improvetesting accuracyVSAvoidchamber complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The thermal chamber is divided into modular panels that can be assembled around the drive unit assembly. The chamber is segmented into side panels, a top cover, and a bottom panel that can be independently manufactured and assembled, allowing the chamber to be customized to fit the specific testing needs without requiring a full walk-in facility.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The thermal testing function is extracted from the entire dynamometer and applied only to the drive unit assembly. By isolating the drive unit in a dedicated thermal chamber while leaving the rest of the testing equipment outside, the system achieves temperature-controlled testing without the need to cool or heat the entire dynamometer system.

Inventive Principle:

Principle #2Taking out (Extraction)

2Volume of stationary object

If a foam box thermal chamber is used, then the testing space is reduced, but energy consumption increases and testing accuracy decreases

Engineering Contradiction:

Improvechamber volumeVSAvoidenergy consumption

Core Design Contradiction:

Volume of stationary objectVSLoss of energy

Solution Approach 1:

Thermal insulation is applied locally to the interior surfaces of the chamber panels rather than requiring a bulky foam box structure. The panels are designed with insulation layers that provide thermal resistance only where needed, reducing overall energy consumption while maintaining effective temperature control within the chamber.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The chamber design uses asymmetric panel configurations with cut-outs and inserts that allow mechanical connections to load units outside the chamber. This asymmetric design enables precise thermal isolation of the drive unit while maintaining efficient heat transfer paths through strategically placed openings for coolant hoses and mechanical connections.

Inventive Principle:

Principle #4Asymmetry

3Measurement precision

If thermal chamber is assembled around drive unit assembly, then testing precision is improved, but assembly complexity increases

Engineering Contradiction:

Improvetemperature control precisionVSAvoidassembly ease

Core Design Contradiction:

Measurement precisionVSEase of manufacture

Solution Approach 1:

The chamber panels are pre-manufactured with integrated cut-outs, inserts, and attachment features that align with the drive unit assembly and load units. These preliminary preparations allow the chamber to be assembled around the drive unit without requiring complex field modifications or adjustments, simplifying the assembly process while maintaining precision.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The thermal chamber panels are designed to nest around the drive unit assembly, with the drive unit positioned centrally within the chamber. The panels are configured to attach to the drive unit and load units in a nested arrangement, allowing the chamber to be assembled in a single operation without disassembling existing components.

Inventive Principle:

Principle #7Nested doll (Nesting)

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 enables efficient, cost-effective, and accurate thermal testing of drive units in a small space, reducing testing costs and time while ensuring high precision and consistency in test results.

Implementation Method 1

A radiator and chiller system are employed to heat or cool the drive unit assembly inside the thermal chamber for testing

Methodology Applied

Scientific EffectHeat transfer: Conduction (thermal)

Implementation Method 2

The four side panels and the top cover form, with a surface underlying the drive unit assembly, a thermal chamber enclosing the drive unit assembly

Methodology Applied

Scientific EffectThermal insulation: Thermal Insulation

Data Source

PatentUS20250369832A1Thermal chamber for electric drive unit testing

Publication Date: 2025.12.04 WHS ENERGY SOLUTIONS LLC

AI summary

A thermal chamber is configured to be assembled around a drive unit assembly to be thermally tested, with load units, torque meters, a chiller, and a hot air blower outside the thermal chamber. Four side panels and a top cover form, together with the surface supporting the drive unit assembly to be tested, the thermal chamber. The side panels and top cover are secured by latches, with cut-outs and inserts allowing thermal chamber to be assembled around the drive unit assembly to be tested while already connected to the load units.