How to diagnose and solve common faults of gas engines, such as knocking, stalling, abnormal emissions, etc?

During the operation of a gas engine, faults such as detonation, stalling, and abnormal emissions may occur, which not only affect the performance of the engine but may also lead to safety hazards. Timely and accurate diagnosis and resolution of these faults are crucial.

Explosion fault

Knocking is one of the common faults in gas engines, characterized by the sharp metallic knocking sound emitted during engine operation. The main reasons are improper mixing ratio of gas and air, excessive ignition advance angle, and engine overheating. During diagnosis, it is possible to preliminarily determine the presence of detonation by listening to the sound, and then use a professional detonation sensor for precise detection. The solution includes adjusting the mixing ratio of gas and air to achieve the optimal combustion state; Optimize the ignition advance angle and set it reasonably according to the engine's operating conditions; Check the engine cooling system to ensure that the engine is operating within the normal temperature range.

Shutdown fault

A stalling fault can cause the engine to suddenly stop running, affecting the normal use of the equipment. There are various reasons for engine stalling, such as insufficient gas supply, spark plug failure, control system malfunction, etc. When diagnosing, the first thing to check is whether the gas pipeline is blocked and whether the valve is open normally; Secondly, check the ignition status of the spark plug to see if there are any issues such as carbon buildup or damage; Finally, check the control system to identify any fault codes. The solutions include cleaning the gas pipeline, replacing damaged spark plugs, and repairing or replacing faulty control system components.

Abnormal emission malfunction

Abnormal emissions are manifested as excessive harmful substances in the exhaust, such as nitrogen oxides, carbon monoxide, etc. This is mainly caused by insufficient combustion, emission control system failures, and other reasons. When diagnosing, it is necessary to use exhaust gas detection equipment to detect emissions and determine the type and content of substances that exceed the standard. At the same time, check the combustion system of the engine to see if there is a situation where the mixture is too rich or too lean; Check whether the emission control system, such as the three-way catalyst and oxygen sensor, is working properly. The solution includes adjusting the mixture ratio to ensure sufficient combustion; Clean or replace emission control components such as three-way catalysts and oxygen sensors to restore their normal function.

In short, the diagnosis and solution of common faults in gas engines require the comprehensive use of professional knowledge and testing equipment to accurately determine the cause of the fault and take effective measures to solve it. Regular maintenance of the engine can reduce the probability of malfunctions and ensure stable operation of the engine.