Bi-Fuel Engine Power Loss Mitigation via Lean Charged Operation
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Solution Overview
Problem
Internal combustion engines face a loss of output power when operating with fuels that have lower energy content, such as hydrogen, due to their inability to efficiently run in lean mode, leading to reduced efficiency and increased pollutant emissions.
Innovation Solution
The engine is retrofitted with a processor-controlled air pump and fuel intake system, allowing it to operate in a charged mode using exhaust gases to drive a turbocharger or supercharger, maintaining a wide open throttle position for optimal air flow, thereby reducing power loss and increasing efficiency when using lower energy fuels like hydrogen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the engine operates in lean mode with lower energy fuels, then fuel efficiency is improved, but output power is reduced
Solution Approach 1:
The system changes the air-fuel ratio parameter by operating in lean mode (higher lambda values) when using lower energy fuels, optimizing combustion efficiency for alternative fuels while maintaining acceptable power output through the interaction with the air pump system
Solution Approach 2:
The air pump system dynamically adjusts air intake based on fuel type and operating conditions, allowing the engine to adapt between rich and lean operating modes to balance power output and fuel efficiency requirements
2Object-generated harmful factors
If the engine operates in lean mode, then pollutant emissions are reduced, but output power is reduced
Solution Approach 1:
The system utilizes parameter changes in air-fuel ratio and charging level to reduce pollutant emissions through lean operation, while compensating for power loss through dynamic air pump control and optimized combustion parameters
3Use of energy by moving object
If the engine uses lower energy fuels, then fuel efficiency is improved, but output power is reduced
Solution Approach 1:
The air pump system provides dynamic compensation for power loss by adjusting air intake levels based on fuel type, allowing the engine to maintain power output while benefiting from the fuel efficiency and emission benefits of alternative fuels
Solution Approach 2:
The system optimizes combustion parameters including air-fuel ratio, ignition timing, and charging level to maximize energy utilization from lower energy fuels while minimizing power output reduction
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 enables the engine to maintain similar output power with lower energy fuels by operating in a charged, lean mode, reducing fuel consumption and pollutant emissions while ensuring efficient operation.
Implementation Method 1
a turbocharger or supercharger, maintaining a wide open throttle position for optimal air flow
Implementation Method 2
igniting a mixture of air and gasoline (or other fuel) inside a cylinder to cause combustion within the cylinder
Data Source
AI summary
A conventional gasoline engine is retrofitted and calibrated to operate as a bi-fuel engine using Hydrogen as the second fuel. When operated with Hydrogen, which typically leads to a reduction of engine output power, the engine is preferably operated in a charged mode and in a lean mode with the engine throttle kept in a wide-open position during charged and lean mode operation resulting in a more efficient engine with a reduction of engine output power loss.