Mixture Supply System with Bypass Valve for Combustion Engine
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Solution Overview
Problem
Internal combustion engines face challenges in controlling excess air ratios due to unstable ignition and emissions issues, with existing methods like adjusting delivery pressure or variable turbine geometry being inefficient or cost-intensive, and valve control systems being slow or complex.
Innovation Solution
A mixture supply system with a bypass and bypass valve, coupled with a valve train that adjusts intake valve timing and opening duration to rapidly control excess air ratios by partially closing or opening the bypass valve in response to engine load changes, allowing for simultaneous adjustment of valve control time to maintain defined air ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If delivery pressure is adjusted via throttle valve or turbocharger bypass, then excess air ratio can be controlled, but energy losses increase due to dissipation of flow energy or wasted enthalpy
Solution Approach 1:
The invention extracts the excess air control function from the traditional throttle valve or turbocharger bypass systems. By introducing a dedicated excess air valve that selectively opens to the atmosphere, the system separates the excess air discharge path from the main air intake and exhaust flows, eliminating the energy losses associated with throttling or recirculation while maintaining precise excess air ratio control.
2Measurement precision
If variable turbine geometry (VTG) is used, then excess air ratio control is improved, but device complexity and cost increase
Solution Approach 1:
The invention extracts the excess air control function from the turbocharger system entirely by using a simple atmosphere-connected valve. This eliminates the need for complex variable turbine geometry mechanisms while achieving the same control objective through a much simpler device that opens directly to the atmosphere.
Solution Approach 2:
The invention replaces expensive and complex VTG mechanisms with a simple, inexpensive excess air valve that has no moving parts in the turbocharger system. The valve is essentially a disposable-like component that opens and closes based on pressure differential, avoiding the need for costly turbine geometry adjustment mechanisms.
3Quantity of substance
If intake valve closing time is varied to control cylinder filling, then mixture delivery is adjusted, but response speed is slow and system becomes complex
Solution Approach 1:
The invention extracts the mixture delivery control from the intake valve timing mechanism. By introducing a separate excess air valve that responds directly to pressure differential changes, the system achieves fast response speed independent of the slow mechanical valve train, while keeping the intake valve control simple and reliable.
Data Source
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AI summary
The invention relates to a mixture-feeding system for an internal combustion engine, having quantitative mixture control. The mixture-feeding system comprises: a supercharging system, which can be connected to the internal combustion engine and which comprises a bypass and a bypass valve arranged in the bypass; and a valve train for periodically actuating an intake valve of the internal combustion engine. A valve control time of the intake valve can be controlled by means of the valve train. The mixture-feeding system is designed, in the event of an increase in the engine load, to at least partially close the bypass valve and to change the valve control time in order to extend the valve opening duration, and to at least partially open the bypass valve during and/or after the end of a valve train latency time, and, in the event of a decrease in the engine load, to at least partially open the bypass valve and to change the valve control time in order to shorten the valve opening duration, and to at least partially close the bypass valve during and/or after the end of a valve train latency time. The invention further relates to a method for operating a mixture-feeding system for an internal combustion engine, said mixture-feeding system having quantitative mixture control.