Woodward Power Generation Engine Control System for Small Natural Gas Engines (PG-10)
Reliable and flexible electronic engine control systems for natural-gas stationary engines
OEM’s around the world depend on Woodward’s Power Generation (PG) engine control system technologies to provide reliable and precise control of engine speed and output in natural gas and propane-fueled engines from 1.6 L to 10 L engines. The systems can be used in generator sets, irrigation and oil well pumps, and other stationary industrial equipment.
PG-10 systems provide accurate and reliable performance control over the useful life of the engine in the extreme operating environments typical of heavy-duty stationary industrial applications.
The PG-10 system commands full authority over spark, fuel, and air. This integrated approach permits precise steady-state speed governing for generator frequency control and air/fuel ratio control for low fuel consumption and emissions at best torque. Continual updates to adaptive parameters allow for fast response to rapid changes in load.
For control of fuel and air on engines otherwise equipped with an ignition system, you might consider Woodward’s LC-50 integrated control-throttle-fuel trim system.
PG-10 Components include:
• Electronic control module
• Electric fuel lockoff solenoid valve
• Fuel pressure regulator
• Fuel trim valves (dual dither valve or rotary trim valve)
• Fixed venturi mixer assembly or air valve mixer
• Electronic throttle assembly
• Oxygen sensors
• Integrated temperature and manifold pressure sensor
• Smart ignition coils
• Smart Gauge interface display
PG-10 Features and Capabilities include:
• Closed-loop control of air-fuel ratio improves equipment durability by reducing maintenance, fuel consumption, and engine component wear.
• Control strategy ensures optimal transient performance for efficient system response.
• Comparisons of actual engine operation to expected values allow the system to compensate for wear, tolerances and adverse operating environments.
• Programmable idle speed control includes speed setpoint modifications for coolant temperature and speed selector switch input.
• Monitoring and diagnostic communication allows immediate assessments and corrections either on-site or remotely.
• Individual diagnostic codes detect and log functional faults, intermittent faults, sensor and actuator failures, and engine protection problems.
• Malfunction indicator lamp (MIL) allows instant analysis and troubleshooting.
• Extensive engine protection features include monitoring of engine coolant temperature, oil pressure, and overspeed.
• Actions in response to fault conditions can be individually calibrated to trigger a limited operating mode, shutdown or activate a warning light.
The PG-10 system uses advanced speed-density control strategy for fuel, spark, and air throttle control. Control/calibration features include, but not be limited to, the following:
• Speed-density, closed-loop fuel control with fuel specific controls for natural gas and LPG
• Speed-load spark control with tables for dwell and timing and fuel type
• Speed-load throttle control with table for maximum TPS limiting
• Pre-catalyst closed-loop fuel control with adaptive learn (including parameters of transport delay, O2 set point voltage, excursion rich/lean, jump back rich/lean, perturbation)
• Post-catalyst HEGO trim of pre-catalyst control to correct for pre-catalyst sensor and variability
• Min/max governing
• All-speed isochronous governing
• Fixed speed isochronous governing with three switch selectable speeds
• CAN/J1939 command of engine speed
• Fuel enrichment and spark timing modifiers for temperature and fuel type
• Transient fuel enrichment based on rate of change in MAP and TPS
• Input sensor selection and calibration
• Auxiliary device control for fuel pump, fuel lock-off solenoid, tachometer, MIL, interlocks, vehicle speed limiting, etc.
• CAN bus data transfer for speed, torque, etc.