Vehicle Pneumatic Compressor Cold Mode Control
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Solution Overview
Problem
Existing pneumatic systems for vehicles face issues with icing at low temperatures, leading to malfunctions and increased energy consumption due to continuous compressor operation in cold modes, which results in unnecessary energy use and wear on components.
Innovation Solution
A method that dynamically controls the compressor's operation based on ambient temperature, activating a cold mode only when necessary to prevent icing, with a variable switch-on duration calculated to achieve the target temperature, reducing energy consumption and wear on components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the compressor operates continuously in cold mode to prevent icing, then the pneumatic system is protected from freezing, but energy consumption increases
Solution Approach 1:
The control device dynamically adapts the compressor operation by switching between normal mode and cold mode based on detected ambient temperature. In cold mode, the compressor operates continuously to provide warm compressed air that prevents icing, while in normal mode it operates only during supply phases. This dynamic adaptation ensures protection when needed while minimizing energy consumption when the risk is low.
Solution Approach 2:
The system changes the operating parameters of the compressor based on temperature conditions. When ambient temperature drops below a threshold, the control device activates cold mode which changes the compressor from intermittent operation to continuous operation, thereby changing the thermal state of the pneumatic system components to prevent freezing.
2Reliability
If the compressor operates continuously in cold mode, then components are protected from freezing, but wear on the compressor increases
Solution Approach 1:
The control device dynamically switches between normal mode and cold mode based on temperature detection. In normal mode, the compressor operates intermittently during supply phases only, while in cold mode it operates continuously but only when icing risk is detected. This dynamic operation reduces unnecessary wear by avoiding continuous operation during normal temperature conditions.
Solution Approach 2:
The control device uses feedback from temperature detection to regulate compressor operation. When the ambient temperature indicates icing risk, the system activates cold mode with continuous compressor operation. When temperature rises above the threshold, the system returns to normal mode with intermittent operation, thereby reducing wear through feedback-controlled adaptation.
3Reliability
If a heating element is added to prevent icing, then protection from freezing is improved, but manufacturing costs increase
Solution Approach 1:
The system uses the compressed air itself, which is already heated during compression, to prevent icing of components. The warm compressed air is directed to the air drying device and venting valve region, allowing the system to self-heat and protect against freezing without requiring external heating elements or additional energy input.
Solution Approach 2:
Instead of discarding the heat generated during compression, the system recovers and utilizes this thermal energy to prevent icing. The warm compressed air that would otherwise be wasted is redirected to heat the air drying device and venting valve, converting a byproduct into a useful function and eliminating the need for separate heating systems.
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 reduces energy consumption and extends the service life of components by minimizing unnecessary compressor operation, achieving cost savings and environmental benefits through optimized energy use.
Implementation Method 1
The compressed air that is heated by the compression process in the compressor gives off heat to the air drying device
Implementation Method 2
For dehumidifying the compressed air, as a rule an air drying device with a replaceable moisture absorbing cartridge is provided. In order to remove the water collected there
Implementation Method 3
an air drying device with a replaceable moisture absorbing cartridge
Implementation Method 4
dry air from the pneumatic system is passed in the opposite direction through the air drying device and is discharged into the surroundings by means of a venting valve
Data Source
AI summary
A method for operating a pneumatic system of a vehicle is disclosed. The pneumatic system comprises an electronically and/or pneumatically controlled compressor which supplies compressed air during a normal mode and which is switched off or idles when not supplying compressed air. In the method, an ambient temperature (T_Umg) around the pneumatic system is continuously sensed and compared with a predefined target temperature (T_Ziel), a freezing risk is detected when the ambient temperature (T_Umg) reaches or drops below the target temperature (T_Ziel), and when a freezing risk has been detected, a cold mode is activated in which the compressor delivers compressed air also outside delivery phases of the normal mode, and additional compressed air is supplied to pneumatic system components that risk freezing. An additional ON time (ED_zus) of the compressor in the cold mode is variably controlled.