Electric Air Compressor Speed Control for Overheating Limits
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Solution Overview
Problem
Existing methods for preventing overheating in electric air compressor assemblies in vehicles are either inefficient, noisy, or pose design and packaging challenges, and they may not effectively prevent overheating in high ambient temperatures or intensive use conditions.
Innovation Solution
A method that involves monitoring the temperature of components in the electric air compressor assembly and controlling the motor speed based on this temperature, by running the motor at a first speed until a temperature threshold is reached, then increasing the speed to a higher second speed until a desired pressure is achieved, thereby managing thermal conditions effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If liquid cooling system is provided, then cooling efficiency is improved, but device complexity and packaging difficulty increase
Solution Approach 1:
The patent extracts the cooling function from a complex liquid cooling system and implements it through a simplified air cooling approach with a fan positioned near the housing, removing the need for pipes, pumps, and radiators while maintaining adequate cooling capability
Solution Approach 2:
The patent replaces the mechanical liquid cooling system with a simpler air cooling system using a fan, substituting complex mechanical components (pump, pipes, radiator) with a simpler rotational component that achieves the same thermal management function
2Device complexity
If air cooling system with fan is provided, then device complexity is reduced, but cooling efficiency and noise performance worsen
Solution Approach 1:
The patent introduces a controller as an intermediary that monitors temperature and dynamically adjusts fan speed, creating a feedback-controlled system that optimizes cooling efficiency while managing noise and energy consumption, rather than using a fixed-speed fan
3Temperature
If motor speed is continuously decreased to prevent overheating, then temperature control is improved, but productivity deteriorates
Solution Approach 1:
The patent implements dynamic motor speed control that adjusts speed based on real-time temperature conditions and compression requirements, allowing the motor to operate at higher speeds when cooling is adequate and reduce speed only when necessary to prevent overheating, rather than continuously decreasing speed
Solution Approach 2:
The patent employs a controller that continuously monitors temperature and uses this feedback to dynamically adjust motor speed, creating a closed-loop control system that optimizes both temperature management and productivity by only reducing speed when actually needed
4Ease of operation
If noise-based control is implemented, then ease of operation is improved, but temperature regulation precision and reliability worsen
Solution Approach 1:
The patent implements temperature-based feedback control where a sensor directly monitors component temperature and the controller adjusts motor speed based on this direct thermal feedback, providing precise temperature regulation rather than relying on indirect noise level measurements
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 method allows for earlier achievement of the desired pressure while keeping the temperature lower than the maximum admissible temperature, reducing the risk of overheating and shutdown, and providing a safeguard against further temperature increases after pressure is reached.
Implementation Method 1
an electric air compressor assembly including an electric motor (11) and a compressor (15) which is mechanically coupled to the electric motor (11)
Implementation Method 2
a compressor (15) which is mechanically coupled to the electric motor (11) and which is capable of providing compressed air to a tank (22)
Implementation Method 3
monitoring the temperature of at least one component of the electric air compressor assembly (10) and controlling the motor speed as a function of said temperature
Data Source
AI summary
A method for operating an electric air compressor assembly. The assembly includes an electric motor and a compressor which is mechanically coupled to the electric motor and which is capable of providing compressed air to a tank The method comprises monitoring the temperature of at least one component of the electric air compressor assembly and controlling the motor speed as a function of said temperature running the motor at a first speed S1, which results in the temperature increasing; when the temperature reaches a temperature threshold, which is lower than a maximum admissible temperature, running the motor at a second speed S2>S1 until a predetermined desired pressure in the tank is reached.