On-line detection method for flow characteristic drift amount of fuel gas nozzle

Abstract

The invention discloses an on-line detection method for the flow characteristic drift amount of a fuel gas nozzle. According to the on-line detection method for the flow characteristic drift amount of the fuel gas nozzle, on the premise that parts and the cost are not increased, a warn that the flow characteristic drift amount of the fuel gas nozzle is too large is given for a user of a natural gas engine so that the safety of the using process of the engine can be ensured; the flow characteristic drift amount of the fuel gas nozzle is detected so that the user of the engine can be assisted to eliminate the fault causes; the user of the engine can be timely reminded to check and replace parts of a fuel gas supply system so that the controllability of fuel gas supply can be ensured, and the use safety of fuel gas can be ensured; and meanwhile, the detection method is executed in the engine deceleration and fuel cut-off processes so that normal operation and use of the engine cannot be influenced. The detection method has the advantages of being simple and effective.

Description

technical field [0001] The invention relates to an online detection method for the flow characteristic drift of a gas nozzle of a natural gas engine, and belongs to the technical field of engine control systems. Background technique [0002] As a key executive component in the gas supply system of a natural gas engine, the gas nozzle is stable and reliable in performance, which directly determines whether the engine combustion is stable and controllable, so it plays a pivotal role in ensuring the safe and stable operation of the engine. [0003] Through the analysis of the structure of the gas nozzle and the statistics of the fault parts, the effective modes are mainly: the electrical fault of the electromagnetic coil, the sticking of the plunger, and the drift of the flow characteristic caused by the wear of the gas metering component. For the electrical failure of the electromagnetic coil, it can be identified through electrical diagnosis; for the sticking of the plunger a...

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Problems solved by technology

For the electrical failure of the electromagnetic coil, it can be identified through electrical diagnosis; for the sticking of the plunger assembly, related online detection methods are mentioned in other patents; for the wear of the gas metering assembly, when it is worn, the gas nozzle will be damaged. The flow characteristics drift, which in turn causes the combustion air-fuel ratio of the cylinder to deviate from the set value, affecting the safety and reliability of the engine; if all the gas nozzles are worn similarly, they can be identified and corrected by monitoring the exhaust air-fuel ratio , the impact on the combustion air-fuel ratio of each cylinder is relatively small; and if the wear degree of a certain gas nozzle is more serious than that of other gas nozzles, because the exhaust air-fuel ratio detected is the exhaust gas diluted by each cylinder The average air-fuel ratio is difficult to reflect the inconsistency of the air-fuel ratio of a single cylinder, and it is impossible to identify the excessive drift of the flow rate of a single gas nozzle. If the combustion air-fuel ratio of a certain cylinder of the engine deviates too much from the design value, it will directly affect the safety of the engine run

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