Parasitic Load Control for Exhaust Temperature
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Solution Overview
Problem
Existing engine systems face challenges in efficiently regenerating particulate traps due to increased parasitic load requirements, which can be costly and impractical for unmanned equipment, as they often rely on auxiliary devices and increased engine speed, limiting their applicability.
Innovation Solution
A parasitic load control system that independently regulates fuel pressure and injection in an engine's combustion chambers to increase the load on the fuel pumping mechanism, thereby elevating exhaust temperatures without the need for auxiliary devices, using a fuel system with a pressure chamber, injection valve, and controller to manage fuel injection and pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If auxiliary devices like air-conditioner compressors are used to increase parasitic load for thermal regeneration, then exhaust gas temperature increases, but device complexity increases and applicability to unmanned equipment is limited
Solution Approach 1:
The fuel injection system is designed to perform its primary function of fuel delivery while simultaneously serving as a parasitic load device for thermal regeneration. The injection valve and pressure chamber are controlled to create additional load on the fuel pump, converting the fuel system into a dual-purpose component that eliminates the need for separate auxiliary heating devices.
Solution Approach 2:
The system uses the engine's own fuel system components (fuel pump, injection valve, pressure chamber) to generate the parasitic load needed for thermal regeneration. Instead of requiring external auxiliary devices, the system leverages existing internal components to achieve exhaust temperature elevation, making the engine self-sufficient for regeneration purposes.
2Temperature
If engine speed is increased to elevate exhaust gas temperature, then thermal regeneration is achieved, but power output decreases and fuel consumption increases
Solution Approach 1:
The system applies parasitic load periodically rather than continuously. The controller activates the parasitic load function only when thermal regeneration is needed, allowing the engine to operate at optimal speed for power production during normal operation. The periodic activation maintains exhaust temperature requirements while minimizing impact on overall productivity.
Solution Approach 2:
The system dynamically adjusts the parasitic load applied to the fuel pump based on real-time engine operating conditions and exhaust temperature requirements. The controller modulates the injection valve and pressure chamber operation to provide variable parasitic load, enabling thermal regeneration when needed while maintaining optimal engine speed and power output during normal operation.
3Temperature
If additional fuel is injected to create richer air/fuel mixture for elevated exhaust temperature, then thermal regeneration is achieved, but fuel consumption increases
Solution Approach 1:
The system uses the fuel pump as an intermediary mechanism to convert mechanical energy from the engine into hydraulic pressure energy in the pressure chamber. This stored hydraulic energy then acts as a mediator to drive the injection valve and create parasitic load, ultimately generating exhaust temperature elevation without requiring additional fuel injection. The intermediary system transforms energy forms to achieve the thermal effect efficiently.
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 allows for efficient thermal regeneration of particulate traps by increasing exhaust temperatures, maintaining engine speed, and facilitating the operation of after-treatment devices like catalytic converters, without relying on auxiliary devices, thus enhancing exhaust emissions control across various engine applications.
Implementation Method 1
a fuel pumping mechanism configured to pressurize fuel in a pressure chamber
Implementation Method 2
an injection valve configured to cause fuel pressure to build within the pressure chamber when in a first position and allow injection of fuel from the pressure chamber into one or more combustion chambers
Implementation Method 3
a controller configured to independently regulate the pressure in the pressure chamber and the injection of fuel into the one or more combustion chambers
Implementation Method 4
increasing a load on the fuel pumping mechanism, increasing parasitic load on the engine, thereby increasing a temperature of the exhaust produced by the engine
Data Source
AI summary
A parasitic load control system is provided. The system may include an exhaust producing engine and a fuel pumping mechanism configured to pressurize fuel in a pressure chamber. The system may also include an injection valve configured to cause fuel pressure to build within the pressure chamber when in a first position and allow injection of fuel from the pressure chamber into one or more combustion chambers of the engine when in a second position. The system may further include a controller configured to independently regulate the pressure in the pressure chamber and the injection of fuel into the one or more combustion chambers, to increase a load on the fuel pumping mechanism, increasing parasitic load on the engine, thereby increasing a temperature of the exhaust produced by the engine.