How to Solve Engine Knocking?
1 Answers
Solutions for knocking: use higher-octane fuel or retard the ignition timing to reduce combustion pressure. When the knock sensor detects engine knocking, it delays the ignition timing to a point where knocking does not occur, and gradually restores the ignition timing once the engine stops knocking. The specific causes of engine knocking are as follows: 1. Overly advanced ignition timing: Premature ignition causes most of the fuel-air mixture to burn while the piston is still in the compression stroke, leading to extreme pressure on the unburned mixture, which then auto-ignites, causing knocking. 2. Excessive carbon buildup in the engine: Heavy carbon deposits in the combustion chamber increase the compression ratio and create high-temperature hotspots on the carbon deposits, resulting in engine knocking. 3. Overheating engine: A too-hot environment raises the intake air temperature, or poor engine coolant circulation causes high engine temperatures, leading to knocking. 4. Incorrect air-fuel ratio: An overly lean fuel-air mixture increases combustion temperature, which raises the engine temperature, making knocking more likely. 5. Low fuel octane rating: High-compression engines have higher combustion chamber pressures, and using fuel with low anti-knock properties increases the likelihood of knocking.
