Hydrogen Peroxide Pilot for Compression-Ignition Engine Auto-Ignition
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Solution Overview
Problem
Hydrogen fuel poses a challenge in compression-ignition combustion engines due to its high ignition temperature, requiring a combustion initiator like diesel pilots, which results in carbon emissions, preventing the vehicle from being classified as zero-emissions.
Innovation Solution
A method for operating a hydrogen direct-injection compression-ignition combustion engine that uses a pilot solution comprising hydrogen peroxide to facilitate auto-ignition of hydrogen fuel, eliminating the need for diesel pilots and reducing carbon emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a diesel pilot is injected to facilitate auto-ignition of hydrogen fuel, then the ignition reliability is improved, but carbon dioxide emissions increase
Solution Approach 1:
The patent changes the chemical composition parameter of the pilot fuel from hydrocarbon-based diesel to hydrogen peroxide-based solution. This parameter change allows the pilot to provide necessary ignition temperature for hydrogen fuel without containing carbon atoms, thus eliminating CO2 emissions while maintaining ignition reliability.
Solution Approach 2:
The patent substitutes the chemical combustion mechanism of diesel fuel with the decomposition mechanism of hydrogen peroxide. Instead of relying on hydrocarbon combustion to generate heat, the system uses H2O2 decomposition, which provides the necessary thermal energy without carbon emissions.
2Reliability
If an electrical spark plug or glow plug is used to initiate combustion, then the ignition reliability is improved, but the device complexity increases
Solution Approach 1:
The patent employs the self-service principle by using the pilot injection system itself to generate the necessary ignition conditions. The hydrogen peroxide solution decomposes exothermically to create a high-temperature zone that automatically ignites the hydrogen fuel, eliminating the need for external electrical ignition devices and their associated structural modifications.
Solution Approach 2:
The patent introduces hydrogen peroxide solution as an intermediary substance between the compression-ignition mechanism and hydrogen fuel. This intermediary provides the necessary thermal bridge to enable combustion without requiring direct modification of the engine's ignition system or cylinder head structure.
3Use of energy by moving object
If compression-ignition engines are used with hydrogen fuel, then the energy efficiency is improved, but the ignition difficulty increases
Solution Approach 1:
The patent applies preliminary action by injecting the hydrogen peroxide pilot solution before the main hydrogen fuel injection. This preliminary pilot creates a high-temperature zone in advance, preparing the combustion chamber conditions necessary for subsequent hydrogen fuel auto-ignition, thereby solving the ignition difficulty while maintaining compression-ignition efficiency.
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 method enables auto-ignition of hydrogen fuel without diesel pilots, reducing carbon emissions and allowing the use of hydrogen in compression-ignition engines, which are more efficient than Otto cycle engines, thereby lowering operational costs.
Implementation Method 1
the pilot comprises hydrogen peroxide... generating a chemically reactive domain to facilitate auto-ignition of the hydrogen fuel
Data Source
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AI summary
A control arrangement (100) and a method for operating a hydrogen direct-injection compression-ignition combustion engine (3). The method comprises injecting (5101) a pilot into the combustion chamber (35) to thereby facilitate auto-ignition of hydrogen fuel, wherein the pilot consists of a solution comprising hydrogen peroxide. The disclosure also relates to a combustion engine system (10) comprising a direct-injection compression-ignition combustion engine (3), operable on hydrogen, and the control arrangement (100). The combustion engine system (10) may be comprised in a vehicle (1).