Work Vehicle Power System Using On-Board Ether Conversion
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Solution Overview
Problem
Heavy work vehicles rely on diesel engines that generate undesirable emissions, and ethanol, despite being a renewable fuel, is not suitable for compression combustion engines due to low cetane number and ignition challenges in cold start and low load conditions.
Innovation Solution
A power system that uses ethanol and converts it on-board into diethyl ether using a catalytic converter, which is then injected into the engine to facilitate ignition, improving cetane number and enabling reliable ignition even at low temperatures, with a controller managing the ethanol and ether ratio based on temperature conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If ethanol is used as fuel in compression combustion engines, then renewable fuel benefits are achieved, but ignition reliability deteriorates due to low cetane number
Solution Approach 1:
The system performs preliminary conversion of ethanol to ether in a catalytic converter before the fuel reaches the combustion chamber. This pre-conversion ensures that ether, with its superior ignition properties and higher cetane number, is available to facilitate reliable ignition under compression combustion conditions while maintaining the renewable fuel benefit of ethanol usage.
Solution Approach 2:
Ether acts as an intermediary substance that bridges the gap between ethanol and compression combustion requirements. The catalytic converter transforms ethanol into ether, which then serves as the actual ignition-promoting agent in the combustion chamber, mediating between the renewable fuel source and the ignition reliability requirement.
2Object-generated harmful factors
If ethanol is used in cold start conditions, then renewable fuel usage is maintained, but ignition capability worsens at low temperatures
Solution Approach 1:
The catalytic converter performs preliminary conversion of ethanol to ether before cold start conditions occur. The ether, being more volatile and having better cold flow properties, is then available to facilitate easier cold starting while the system continues to use renewable ethanol as the primary fuel source.
Solution Approach 2:
The system changes the chemical parameter of the fuel by converting ethanol to ether through catalytic action. This parameter change improves cold start capability and ignition properties while maintaining the fundamental benefit of using renewable ethanol-based fuel.
3Reliability
If diesel fuel is used, then ignition reliability is improved, but harmful emissions worsen
Solution Approach 1:
Ether serves as an intermediary that provides diesel-like ignition reliability without requiring actual diesel fuel. The catalytic conversion process creates ether from ethanol, which then facilitates compression ignition similar to diesel while the exhaust emissions remain closer to those of renewable fuel combustion.
Solution Approach 2:
The system changes the cetane number parameter of the fuel by converting ethanol to ether. This parameter change achieves diesel-like ignition characteristics and reliability while maintaining the emissions benefits of renewable fuel usage.
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 enhances ignition properties, maintains diesel-like performance, and reduces emissions by utilizing ethanol and ether as fuels, improving engine efficiency and capability in heavy work applications.
Implementation Method 1
a catalytic converter fluidly coupled to receive alcohol from the alcohol tank and configured to convert the alcohol into ether
Implementation Method 2
an electric heating element configured to heat the catalytic converter in order to facilitate the conversion of ethanol into ether
Implementation Method 3
the catalytic converter of the power system is arranged such that the exhaust gas heats the catalytic converter in order to facilitate the conversion of ethanol into ether
Implementation Method 4
the EGR cooler is integrated with the catalytic converter such that heat is transferred from the exhaust gas to the catalytic converter
Implementation Method 5
the charge air cooler is integrated with the ether reservoir such that heat is transferred from the air in the charge air cooler to the ether reservoir
Implementation Method 6
an engine including one or more piston-cylinder sets configured to selectively receive the alcohol stored in the alcohol tank and the ether converted by the catalytic converter and to combust the ethanol and the ether with air to produce mechanical power
Data Source
AI summary
A power system for a work vehicle includes an alcohol tank configured to store alcohol; a catalytic converter fluidly coupled to receive alcohol from the alcohol tank and configured to convert the alcohol into ether; and an engine including one or more piston-cylinder sets configured to selectively receive the alcohol stored in the alcohol tank and the ether converted by the catalytic converter and to combust the alcohol and the ether with air to produce mechanical power and exhaust gas.