Thermal Conditioning System for Gaseous Fuel Injectors
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Solution Overview
Problem
Existing natural gas fuel-supply systems for internal-combustion engines face issues with gas temperature dropping below a critical threshold, leading to injector malfunction or failure, especially during cold starting, as conventional heat exchangers are insufficient in heating the gas to prevent these issues.
Innovation Solution
A thermal-conditioning system with a first heating device using an electrical resistance embedded in the gas supply line and a second heating device in the form of a thermal blanket for the injectors, controlled by a unit that monitors temperature and activates these devices to maintain optimal operating conditions, ensuring the gas and injectors remain above the critical temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional heat exchanger using engine cooling water is used to heat the natural gas, then the system structure is simple, but the gas temperature cannot be maintained above the critical threshold during cold starting
Solution Approach 1:
The heating system is divided into two independent heating devices: a first heating device (electrical resistance) in the gas supply line and a second heating device (thermal blanket) for the injectors. This segmentation allows each device to address specific thermal needs, ensuring reliable injector operation while maintaining system simplicity through modular design.
Solution Approach 2:
The control unit activates the first heating device before the engine starts to preheat the natural gas in the supply line. This preliminary heating action ensures that when the engine starts, the gas temperature is already above the critical threshold, preventing injector malfunction from the outset.
2Reliability
If electrical heating devices are added to maintain gas temperature above critical threshold, then injector reliability improves, but system complexity and energy consumption increase
Solution Approach 1:
The control unit continuously monitors the temperature of the natural gas and the state of the engine, and adjusts the activation of the heating devices accordingly. This feedback mechanism ensures that energy is consumed only when necessary to maintain gas temperature above the critical threshold, optimizing energy usage while ensuring injector reliability.
Solution Approach 2:
The system performs preliminary heating of the gas supply line before engine startup using the first heating device. This advance preparation reduces the total energy required by pre-conditioning the gas, so that less energy is needed during actual operation to maintain temperature.
3Reliability
If the gas is heated more aggressively to ensure it stays above critical temperature, then injector malfunction is prevented, but energy consumption and system complexity increase
Solution Approach 1:
The heating function is segmented into two independent devices with distinct functions: the first heating device handles gas line heating and the second heating device handles injector heating. This segmentation simplifies the control logic for each device while collectively ensuring comprehensive thermal protection of the injector system.
Solution Approach 2:
The system uses the engine's own cooling water temperature as a feedback signal to determine when heating is needed. When the cooling water temperature indicates cold conditions, the control unit automatically activates the heating devices, allowing the system to self-regulate based on engine thermal state without complex external control.
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
The system effectively maintains the gas and injectors above the critical temperature, preventing malfunctions and ensuring efficient operation, even during cold starts, while integrating seamlessly with vehicle control systems and being suitable for retrofit applications.
Implementation Method 1
a first heating device (16), designed to heat the gas supplied by the gas-supply system
Implementation Method 2
a second heating device (18), designed to heat the injectors mounted in the fuel manifold (10)
Implementation Method 3
at least one temperature sensor (22), configured for detecting the temperature of the gas in a given point of the system
Implementation Method 4
a heat exchanger, which has the purpose of vaporising and heating the natural gas. This heat exchanger uses as conditioning fluid the cooling water of the engine
Data Source
AI summary
Described herein is a thermal-conditioning system for a system for supplying gaseous fuel in an the internal-combustion engine of a vehicle, which is characterized in that it envisages a first device for heating the gaseous fuel and a second device for heating the injectors of the fuel-supply system. A control unit is purposely designed for governing the two devices on the basis of the operating conditions of the engine.