Rich burn air fuel ratio control system for gas engines with catalyst protection and oxygen monitoring

Air Fuel Ratio Control System for Rich Burn Gas Engines

This air fuel ratio control system is engineered for rich burn gas engines operating in industrial and oil & gas environments. By continuously monitoring exhaust oxygen levels and automatically adjusting fuel delivery, the controller maintains optimal combustion efficiency and protects catalytic converters from overheating. Designed for reliable performance in demanding conditions, it improves engine stability, reduces emissions, and supports long-term operational efficiency.

Key Features of the Air Fuel Ratio Control System

Applications

Technical Specifications

Engine Type Rich Burn Gas Engines
Control Type Closed-Loop Air Fuel Ratio Control
Power Supply 12 / 24 VDC Nominal
Oxygen Sensor Input Heated Exhaust Gas Oxygen (HEGO)
Sensor
Catalyst Monitoring Pre & Post Thermocouple Inputs
(Type K Optional)
Temperature Protection Differential Catalyst Temperature Monitoring
Fuel Valve Compatibility Butterfly Fuel Control Valve / Proportional
Solenoid Valve
Alarm Outputs Separate Alarm and Shutdown
Relay Contacts
User Interface Full-Color Graphical Display
with Diagnostics
Enclosure Rating IP66 Industrial Enclosure
Typical Applications Gas compressor engines, industrial
generator sets, oilfield equipment, marine
auxiliary gas engines

How the Air Fuel Ratio Control System Works

The air fuel ratio control system operates using closed-loop combustion control. A heated exhaust gas oxygen sensor continuously measures oxygen levels in the engine’s exhaust stream and sends real-time feedback to the controller.

The controller compares the measured oxygen value against a predefined rich burn air fuel ratio set point. If deviations occur due to engine load changes, fuel composition variations, or environmental conditions, the system automatically adjusts the fuel control valve to restore the optimal mixture.

Optional pre- and post-catalyst temperature monitoring allows operators to evaluate catalytic converter performance. By detecting abnormal temperature differences, the system can trigger alarm or shutdown outputs to protect the engine and emission control components.

This continuous real-time adjustment improves combustion stability, enhances fuel efficiency, reduces emissions, and extends catalyst service life in industrial gas engine applications.

Frequently Asked Questions

What is an air fuel ratio control system?
An air fuel ratio control system is a closed-loop combustion controller that maintains the correct mixture of air and fuel in gas engines. It continuously monitors exhaust oxygen levels and adjusts fuel delivery to ensure optimal combustion efficiency.
Why is air fuel ratio control important in rich burn gas engines?
Rich burn gas engines require precise fuel mixture control to maximize performance and protect catalytic converters. Proper air fuel ratio control improves fuel efficiency, reduces emissions, and prevents catalyst overheating.
How does the system protect the catalytic converter?
The system supports pre- and post-catalyst temperature monitoring. If abnormal temperature differences are detected, alarm or shutdown outputs can be activated to prevent catalyst damage and extend service life.
What types of engines can use this controller?
The air fuel ratio controller is designed for rich burn gas engines used in industrial generator sets, compressor stations, oilfield equipment, and marine auxiliary applications.
Does the system support alarm and shutdown functions?
Yes. The controller includes dedicated relay outputs for alarm and engine shutdown functions, improving operational safety and equipment protection.

Why Choose Rajkot Marine L.L.C

As an authorized distributor in the UAE & GCC Region, Rajkot Marine L.L.C delivers genuine products with expert technical support. Our team ensures seamless integration for marine, industrial, and oilfield applications — helping clients achieve consistent performance and reliability.

Authorized Distributor

We provide genuine Enovation Controls products backed by manufacturer warranties and support.

Technical Expertise

Our engineers assist with complete system configuration, installation, and troubleshooting.

Regional Presence

Serving UAE & GCC with fast delivery, regional service, and technical guidance.

Reliable Solutions

All solutions are designed to withstand demanding marine and industrial environments.

Office Address

Rajkot Marine LLC
Jerf Industrial No 1 PO.Box: 5861.
AJMAN – UAE.
Main Office
Rajkot Diesel Machines Tr.Est.LLC Industrial Area 15, Capitals Kitchen Building, Show room, no.2 - Sharjah - United Arab Emirates

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