E3 Lean Burn Gas Engine Control System

    Fully-integrated approach to precise governing and air-fuel ratio control


    E3 Lean Burn System


    Woodward's E3 Lean-Burn Trim system controls lean-burn industrial gas engines used in numerous power generation, pumping, and other stationary applications ranging from 300 kW to 2000 kW (400–2700 hp). The highly accurate, closed-loop control system helps customers meet regulated emission levels while maintaining engine performance over a wide range of fuel qualities.

    The E3 Lean-Burn’s core functionality is an air/fuel ratio trim control using either exhaust oxygen closed loop or generator power feedback. Additional functions are available by adding optional hardware (see tab below). The base system hardware is an air/fuel ratio control E3 controller, trim valve & UEGO or kW feedback sensor. The fuel metering subsystem consists of a carburetor combined with a fuel trim valve, each appropriately sized for the application.

    The system can control speed/load, air/fuel ratio and spark timing/duration, at any engine load and speed condition. It can be applied to inline or multibank engines in a wide range of power outputs, both naturally aspirated and turbocharged. Calibration can be fuel specific and the control is easily programmable through Woodward Toolkit.

    The E3 Lean-Burn system accommodates a wide range of gas compositions, including LPG, pipeline natural gas, landfill gas, and other low-heating value gases. Anticipated changes in gas quality during normal operation of the engine are compensated by the control by means of kW feedback or UEGO closed loop.


    E3 Lean-Burn System features include: 

    • Integrated approach reduces system complexity and reduces overall cost
    • Scalable to meet entire range of customer needs
    • Integrated engine protection and diagnostics to ensure safe engine operation
    • Power generation or mechanical drive applications



    Available E3 Lean-Burn functions and corresponding hardware requirements are noted below.  

    • Integrated ignition featuring Woodward heavy duty 24-volt Smart Coils is available for lower BMEP applications and non-hazardous locations.
    • For higher BMEP applications and those requiring Class 1, Division 2 certified ignition, an external IC-920/922 ignition system is available, with standard or shielded capacitive discharge coils, as required. The IC-920/922 ignition controller is integrated with the E3 controller, over a J1939 CAN communication network.
    • Integrated power management is available using the easYgen™ 3000 series power management controller, which communicates with the E3 controller over a second J1939 CAN communication network.



    E3 emission control systems can be retrofitted to your existing engines by a Woodward Recognized Engine Retrofit (RER) partner. Find information on an RER in your area from the listing below.


    Recognized Retrofit Partners

    Alberta Governor Service: Western Canada provinces of British Columbia, Alberta, Saskatchewan, Manitoba. 

    Provinces of New Brunswick, Newfoundland and Labrador, Nova Scotia, Ontario, Prince Edward Island, and Quebec, and territories of Northwest Territories, Nunavut, and Yukon--select an RER closest to you.

    Drake Controls: California, Kansas, western Nevada, Oklahoma, southeastern New Mexico, Texas, Mexico.

    Governor Control Systems: Alabama, Arkansas, Florida, Georgia, northern Idaho, Kentucky, Louisiana, Mississippi, North Carolina, Oregon, South Carolina, Tennessee, Virginia, Washington, West Virginia.

    Peaker Services: Midwest: Illinois, Indiana, Iowa, Michigan, Minnesota, Missouri, eastern Nebraska, eastern North Dakota, Ohio, eastern South Dakota, Wisconsin; Northeast: Connecticut, Delaware, Maine, Maryland, Massachusetts, New Hampshire, New Jersey, New York, Pennsylvania, Rhode Island, Vermont.

    Winn-Marion: Rocky Mountains: Arizona, Colorado, southern Idaho, Montana, eastern Nevada, New Mexico, Utah, Wyoming; western Nebraska, western North Dakota, western South Dakota.

     Alaska, Hawaii: Select an RER closest to you.


    Recognized Retrofit Partners

    Governor Control Services