A Diesel-LNG Dual Fuel Engine Misfire Diagnosis Method
A dual-fuel engine, diagnostic method technology, applied in the direction of engine ignition, engine components, machines/engines, etc., can solve problems such as damaged cylinders, unstable engine speed, safety issues, etc.
Active Publication Date: 2015-10-21
宝应县鲁绣经济发展有限公司
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Problems solved by technology
[0002] Diesel-LNG dual-fuel engine "misfire" is divided into two situations, one is the misfire caused by the damage of the engine injector, that is, lack of cylinder, which is a real misfire, and the result is unstable diesel engine speed and misfire in dual-fuel mode All the natural gas injected by the cylinder enters the exhaust pipe, which leads to energy waste and safety problems, and even damages the cylinder in severe cases; the second is due to the failure of the natural gas injection device, such as the injection valve not working, the consequence is that the engine speed is unstable and the cycle occurs. Strictly speaking, this is not a misfire, but a lack of natural gas injection or a complete stop of injection
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[0021] Taking a 6-cylinder diesel-LNG dual-fuel engine with 4 injection valves per cylinder as an example, such as figure 1 As shown, a rack position sensor needs to be installed, and the electronic control unit controls the injection valve to inject natural gas. The natural gas enters the intake manifold of each cylinder from the natural gas pressure pipe to mix with air, and then enters the cylinder to be mixed with diesel for blending. The crankshaft position sensor is used to detect speed fluctuations, and the cam position sensor is used to determine the injection phase.
[0022] Steady-state condition judgment, the steps are as follows figure 2 Shown:
[0023] In S1, the engine sensor circuit failure, injection valve circuit failure, and sensor parameter failure are diagnosed to confirm that the engine is in a normal working state.
[0024] In S2, each cycle triggers a speed stability judgment, and the current speed and the average rotational speed of 100 first-in-fi...
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The invention provides a fire catching diagnostic method based on a diesel-LNG dual-fuel engine, and belongs to the field of engine electronic control. The fire catching diagnostic method is suitable for fire catching diagnosis of each air cylinder of the multi-snifting-valve diesel-LNG dual-fuel engine. When the engine runs in the diesel-LNG dual-fuel mode, when the certain cylinder is confirmed catching fire, a part of snifiting valves of the cylinder are cut off, the rotating speed fluctuation conditions generated before and after cutting off is conducted are compared, if the rotating speed does not obviously fluctuate after cutting off is conducted, it is proved that fire catching is caused by faults of the cut-off snifting valves or faults of an oil atomizer, then, the rest of the snifting valves of the cylinder are cut off, if the rotating speed still does not obviously fluctuate, it is judged that fire catching is caused by faults of the oil atomizer, and if the rotating speed obviously fluctuates, it is determined that fire catching is caused by faults of the cut-off snifting valves, wherein it is proved that no fault occurs when the rotating speed fluctuations are increased when the part of the snifting valves are cut off.
Description
technical field [0001] The invention relates to the field of engine electronic control, and provides a method for diagnosing misfire of a diesel-LNG dual fuel engine. Background technique [0002] Diesel-LNG dual-fuel engine "misfire" is divided into two situations, one is the misfire caused by the damage of the engine injector, that is, lack of cylinder, which is a real misfire, and the result is unstable diesel engine speed and misfire in dual-fuel mode All the natural gas injected by the cylinder enters the exhaust pipe, which leads to energy waste and safety problems, and even damages the cylinder in severe cases; the second is due to the failure of the natural gas injection device, such as the injection valve not working, the consequence is that the engine speed is unstable and the cycle occurs. Strictly speaking, this is not a misfire, but a lack of natural gas injection or a complete stop of injection. In order to identify the above faults, it is necessary to develop...
Claims
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IPC IPC(8): F02P17/00
Inventor 沈剑黄兴华赵旭冉吴迪王洪张育华
Owner 宝应县鲁绣经济发展有限公司