Technology for the development of a big-size injector that is a core device in fuel supply system of a MW-size internal combustion engine fueled with methane-based gas such as natural gas, shale gas and bio-gas etc. The moving part is opened by the electromagnetic force generated from the solenoid and closed by the pressure difference and the spring force. The high flow rate methane-based gas fuel injection valve features a specific shape of flow channel.

 

 

Client / Market

• MW-class gas engine production company (for ship and power generation)
• Retrofit company from large diesel engine to large gas engine (including a retrofit kit manufacturer and seller)
• Repair and maintenance company of gas engines for medium/large ships and power generation

 

Necessity of this Technology

• Existing injector has a confined area for flow channel and there is a limit for sufficient fuel supply.
• Because the leakage rate of existing high flow rate injector (4.8 L/min or less at the pressure difference of 0.7 bar) is large, an injector with a smaller leakage rate is needed.
• Expensive ferromagnetic material is used in the core and armature. Therefore, there is a need for an economically feasible material with great formability and durability that could fulfill required response time and flow rate.
• Injector capability that could guarantee stable stroke and flow rate with the same control signal is required.

 

Technical Differentiation

• Solenoid structure with maximized magnetic force by electromagnetic analysis and experiment
• Armature structure with minimal resistance and optimized stroke to secure quick responsiveness and sufficient flow rate
• Differentiation of injection valve driving characteristics according to the change in material of the solenoid core and armature (Silicon steel with strong magnetic force is appropriate for a case of high pressure difference)
• Aspecific shape of internal flow channel designed to guarantee high flow rate
• Consistent valve opening and closing responsiveness matching with stroke regardless of repetitive injection valve operation
• Minimized valve leakage through improvement of lower outlet design by replacement of O-ring
• Monitoring and control function for the high flow methane-oriented gaseous fuel injector
• Measurement of stopper abrasion and spring elasticity change using shock and oscillation detection in the acceleration sensor for injector maintenance and selfdiagnosis of error

 

Excellence of Technology

• Valve response accuracy, reproducibility and flow rate linearity following the control duty ratio
• Injection valve opening and closing responsiveness within 2 ms
• Ultra-low leak injection valve with the leakage of 2 to 3 L/min under the pressure difference of 0.2 to 2 bar

 

 

Current Intellectual Property Right Status

PATENT

• An Injection Valve for the Methane-Oriented Gaseous Fuel (KR1570492)
• A Monitoring and Control Method of Injection Valve for the Methane-Oriented Gaseous Fuel (KR1674994)

KNOW-HOW

• High flow methane-oriented gaseous fuel injection valve design technology
• High flow methane-oriented gaseous fuel injection valve control technology
• Methane-oriented gaseous fuel injection valve breakdown diagnosis technology