Auxiliary Air Compressor Isolation for Engine Supercharging
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Solution Overview
Problem
Conventional electrically assisted supercharging systems face issues with high design and use costs, and sudden pressure changes due to the auxiliary air compressor operating in the same intake channel as the exhaust gas turbocharger, leading to delayed throttle response and engine performance instability, especially at low-speed operations.
Innovation Solution
An electrically assisted supercharging control method and system that uses a one-way valve and separate intake branch to isolate the auxiliary air compressor, allowing it to operate at smoothly changing rotation speeds based on real-time engine parameters like rotation speed, fuel injection quantity, and coolant temperature, preventing compressed air from driving the impeller and optimizing engine performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the auxiliary air compressor and the exhaust gas turbocharger compressor are in the same intake channel, then the supercharging function is provided, but compressed air drives the auxiliary air compressor impeller to rotate, requiring consistent design service life and increasing design and use costs
Solution Approach 1:
The patent divides the intake channel into two separate paths: one for the exhaust gas turbocharger compressor and another for the auxiliary air compressor. This segmentation allows the auxiliary air compressor to operate independently without being driven by compressed air from the turbocharger, thereby reducing design complexity and costs while maintaining reliable supercharging function.
Solution Approach 2:
The patent extracts the auxiliary air compressor from the common intake channel of the exhaust gas turbocharger. By taking out the auxiliary air compressor and placing it on a separate intake branch, the system eliminates the problem of compressed air driving the auxiliary impeller, reducing design and use costs while preserving the supercharging reliability provided by the turbocharger.
2Ease of operation
If the auxiliary air compressor starts or stops suddenly, then the supercharging control is simplified, but sudden pressure changes occur affecting engine performance
Solution Approach 1:
The patent implements dynamic control of the auxiliary air compressor by adjusting its rotation speed smoothly based on real-time engine operating parameters. This dynamic adjustment prevents sudden pressure changes that would occur with abrupt start/stop operations, thereby maintaining engine performance reliability while keeping the control system adaptable to varying conditions.
Solution Approach 2:
The patent employs feedback control mechanisms that continuously monitor engine operating parameters and adjust the auxiliary air compressor's rotation speed accordingly. This feedback system ensures smooth transitions during start-up and shutdown, preventing sudden pressure changes that could adversely affect engine performance while maintaining simplified operational control.
3Power
If the auxiliary air compressor operates at high speed to provide sufficient air pressure, then the supercharging effect is improved, but the service life of the auxiliary air compressor is reduced
Solution Approach 1:
The patent dynamically adjusts the rotation speed of the auxiliary air compressor based on actual engine needs rather than operating at constant high speed. This dynamic speed adjustment provides sufficient air pressure for effective supercharging while reducing unnecessary high-speed operation, thereby extending the service life of the auxiliary air compressor.
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 solution reduces design and use costs of the auxiliary air compressor, ensures stable engine operation by avoiding sudden pressure changes, and extends its service life by allowing for customizable design, while maintaining engine performance and preventing damage from extreme coolant temperatures.
Implementation Method 1
disposing a one-way valve and an intake branch connected in parallel to the one-way valve on an intake channel between an exhaust gas compressor and an intake manifold
Implementation Method 2
disposing an auxiliary air compressor on the intake branch
Implementation Method 3
controlling, according to actual engine parameters, the auxiliary air compressor to operate at a smoothly changing rotation speed
Implementation Method 4
A conventional turbocharger uses energy of exhaust gas discharged from an engine to drive a turbine, and the turbine drives a coaxial compressor impeller
Implementation Method 5
the turbine drives a coaxial compressor impeller. The impeller compresses air passing through an air filter and introduces the compressed air into an engine cylinder
Data Source
Figure 1~2
Figure 3
AI summary
An electrically assisted supercharging control method for an engine is disclosed, including: disposing a one-way valve (4) and an intake branch (5) connected in parallel to the one-way valve (4) on an intake channel (3) between an exhaust gas compressor (1) and an intake manifold (2), disposing an auxiliary air compressor (6) on the intake branch (5), and controlling, according to actual engine parameters, the auxiliary air compressor (6) to operate at a smoothly changing rotation speed. An electrically assisted supercharging control system for an engine is further disclosed. Compressed air can be prevented from driving an impeller of the auxiliary air compressor to rotate, design and use costs of the auxiliary air compressor are reduced, and operation performance of the engine is ensured.