ABB DEGO-II SPEED GOVERNOR QHFD122

Overview

DEGO-II is the second-generation electronic governor system designed by ABB (formerly ASEA Brown Boveri) for marine diesel engines. As a member of the DEGO series governors, it adopts a full electronic control architecture to accurately control the speed and load of marine diesel main engines. As an early digital governor system, it has been gradually replaced by DEGO III and DEGO IV, but many ships still use it or are undergoing technical modifications.

Technical Parameters

Basic Information

• Model Series: DEGO-II / DEGO S Series
• Specific Models: QHFD 111 / QHFD 122
• Manufacturer: ABB (ASEA)
• Application Type: Marine Main Engine Electronic Governor

Reference Parameters (Based on DEGO Series General Specifications)

• I/O Interface: Digital input/output, analog signal processing
• Speed Sensor: Supports multi-channel speed signal input
• Control Signal: Analog or increment/decrement signal setting
• Operating Power Supply: Marine DC power supply (usually 110V DC)

Product Features

Main Characteristics

• Full Electronic Control: Replaces traditional mechanical governors with an electronic control unit
• Redundant Design: Adopts dual speed sensor input to improve safety
• PID Regulation: Built-in PID controller for speed and load optimization
• OverSpeed Protection: Equipped with overspeed monitoring and suppression functions
• LCD Display: Shows speed, fuel, control mode and alarm information
• Multi-brand Actuator Compatibility: Can control various brands and types of actuators
• Fault Diagnosis: Built-in diagnostic function for easy maintenance and troubleshooting

Structure and Composition

System Architecture

• Control Unit: Core electronic control board, including processor and I/O interface
• Actuator Drive: Built-in actuator driver (can output 0-20mA, ±10V or PWM signals)
• Sensor Interface: Speed sensor signal input (usually magnetic pickup)
• Operation Panel: Local display and manual control unit
• I/O Module: Analog and digital signal input/output
• Communication Interface: RS-485, CAN (later models), etc.

Hardware Composition

• QHFD 111: DEGO-II main engine governor main module
• Supporting Actuators: Hydraulic or electric actuators (torque range 70-400Nm)
• Speed Sensor: Magnetoelectric speed sensor

Application Fields

Main Applications

• Marine Main Engine Propulsion: Single or multi-main engine propulsion systems
• Electric Propulsion: Multi-engine parallel drive systems
• Generator Sets: Marine and onshore diesel generator sets
• Retrofit Applications: Can replace old mechanical governors, DEGO S series, Wärtsilä, Woodward and other brand products

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