Gas Combustion Engine Fuel Gas Buffer Storage Tank
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Solution Overview
Problem
Gas combustion engines with common rail systems face challenges in managing fuel gas pressure, leading to insufficient fuel supply during high engine speed and torque conditions, and inefficient fuel reuse in cases where fuels like hydrogen cannot be easily returned to the primary tank.
Innovation Solution
Incorporating an additional gas buffer storage tank connected to the high-pressure fuel storage tank to temporarily store excess fuel gas and supply it to the air intake section, allowing for alternative fuel gas distribution and eliminating the need for costly recirculation to the primary tank.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rail pressure is increased to ensure sufficient fuel gas supply during high engine speed and torque conditions, then fuel gas delivery reliability is improved, but fuel gas consumption increases and injection precision deteriorates due to extended injector opening time
Solution Approach 1:
The invention pre-compresses fuel gas to high pressure (350-700 bar) in a fuel storage tank before injection, enabling the system to maintain sufficient rail pressure during high-load conditions without continuous energy input. This preliminary compression action resolves the contradiction by storing energy in advance, allowing reliable fuel delivery during peak demand while avoiding continuous energy consumption during normal operation.
Solution Approach 2:
The system dynamically adjusts rail pressure based on engine operating conditions through a pressure regulation valve that controls fuel gas flow from the high-pressure storage tank. During high engine speed and torque conditions, the valve maintains higher pressure for reliable delivery; during lower load conditions, it reduces pressure to minimize energy consumption and optimize injection precision, thus resolving the contradiction between reliability and energy loss.
2Reliability
If rail pressure is permanently maintained at high levels to cover fuel gas requirements in any load range, then fuel gas supply reliability is improved, but injection precision deteriorates due to extended injector opening time in medium and lower load ranges
Solution Approach 1:
The system implements dynamic rail pressure regulation that adapts to engine load conditions. A pressure control valve adjusts the rail pressure in real-time: maintaining high pressure during high-load conditions for reliable supply, and reducing pressure during medium and lower load conditions for precise injection control. This dynamic adjustment resolves the contradiction between supply reliability and injection precision across different operating ranges.
Solution Approach 2:
The invention changes the operating parameter (rail pressure) based on engine load requirements. By varying the pressure level dynamically rather than maintaining a constant high pressure, the system achieves both reliable fuel supply during high demand and precise injection control during lower demand, thus resolving the contradiction between reliability and manufacturing precision.
3Loss of substance
If fuel gas is recirculated from the high-pressure storage tank back to the primary tank, then fuel gas reuse is improved, but system complexity increases due to costly recirculation infrastructure
Solution Approach 1:
The invention extracts and utilizes the pressure energy from fuel gas being discharged from the high-pressure storage tank by routing it through a turbocharger compressor. Instead of recirculating the gas back to the primary tank through complex infrastructure, the system extracts useful work (compressing intake air) from the pressure differential, thereby achieving fuel gas reuse while simplifying the system architecture.
Solution Approach 2:
The fuel gas discharge process from the high-pressure storage tank self-generates compressed air for the turbocharger through the pressure differential. The system uses its own operational byproduct (pressurized fuel gas flow) to drive the turbocharger compressor, eliminating the need for external recirculation infrastructure and reducing system complexity while maintaining fuel gas reuse benefits.
Data Source
AI summary
The invention relates to an engine having at least two combustion chambers, a shared high-pressure fuel storage tank for holding fuel gas available as pressurized gas, and means for direct injection of the fuel gas from the high-pressure fuel storage tank into the combustion chambers, wherein it is possible to provide the fuel gas in the high-pressure fuel storage tank from a primary tank, wherein it is possible to withdraw the fuel gas from the primary tank and/or to generate it from a fuel withdrawn from the primary tank along a conversion path, and a gas buffer storage tank connected to the high-pressure fuel storage tank discharges fuel gas from the high-pressure fuel storage tank into the gas buffer storage tank, and the gas buffer storage tank is further connected via a separate fuel gas path to the air intake section of the gas combustion engine.