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In-cylinder water spraying control method

A control method and timing technology, which is applied in the direction of engine control, adding non-fuel substances to fuel, engine components, etc., can solve the problems of slow combustion in the cylinder and high heat load of the engine, so as to increase the combustion rate, reduce the heat load, and improve the geometry. Effect of Compression Ratio

Inactive Publication Date: 2021-03-19
GUANGXI YUCHAI MASCH CO LTD
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Problems solved by technology

In terms of combustion performance, the use of EGR rate makes the combustion in the cylinder slower, and the engine still faces the problem of excessive heat load

Method used

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  • In-cylinder water spraying control method
  • In-cylinder water spraying control method
  • In-cylinder water spraying control method

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the specific embodiments in the accompanying drawings.

[0026] refer to Figure 1-3 , a water spray control method in a cylinder, comprising:

[0027] Set the late closing time of the intake valve;

[0028] Establish and save the water spray map table with rotation speed, load, top dead center signal, maximum burst pressure in the cylinder, exhaust temperature in front of the vortex, water spray time, and water spray duration, and the water spray map table is stored in the ECU;

[0029] The ECU obtains the current engine 1 actual speed, actual load, actual dead center signal, actual maximum explosion pressure in the cylinder, and actual exhaust temperature in front of the vortex. , The actual exhaust temperature in front of the vortex is queried from the water spray map table to obtain the best water spray time and the best water spray duration;

[0030] The ECU controls the high-pressure wate...

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Abstract

The invention discloses an in-cylinder water spraying control method, relates to the technical field of in-cylinder water spraying, and solves the technical problems that an EGR system is complex andrelatively high in cost. The control method includes the following steps that the later closing moment of a gas inlet valve is set; a water spraying pulse spectrum table in which the rotating speed, the load, the top dead center signal, the in-cylinder highest explosion pressure, the turbine front temperature, the water spraying moment and the water spraying duration are stored is established; theactual rotating speed, the actual load, the actual top dead center signal, the actual in-cylinder highest explosion pressure and the actual turbine front temperature are obtained, and the water spraying pulse spectrum table is queried according to the actual rotating speed, the actual load, the actual top dead center signal, the actual in-cylinder highest explosion pressure and the actual turbinefront temperature to obtain an optimal water spraying moment and an optimal water spraying duration; according to the optimal water spraying moment and the optimal water spraying duration, a high-pressure water rail and an in-cylinder water sprayer are controlled to work to precisely spray water into the cylinder. The EGR system can be completely replaced by accurately spraying water into the cylinder by closing the gas inlet valve later and combining the water spraying pulse spectrum table.

Description

technical field [0001] The invention relates to the technical field of water spraying in cylinders, more specifically, it relates to a method for controlling water spraying in cylinders. Background technique [0002] In order to meet the NOx emission limit requirements of the current National VI emission regulations, the National VI natural gas engine needs to adopt the combustion emission technology route of equivalent combustion combined with three-way catalysis. That is, the equivalent combustion + EGR + three-way catalytic combustion emission technology route adopted by the current engine, the biggest technical problem is the EGR rate control accuracy and a series of problems caused by the use of EGR. [0003] First, the EGR system is relatively complex, costly and takes up a large installation space; [0004] The second is the transient control accuracy of the EGR rate. When the actual EGR rate is lower than the target value, it is easy to cause knocking failure, and i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M25/03F02D13/02
CPCF02M25/03F02M25/0227F02D13/0234
Inventor 官维盛利朱赞董伟李琼华张松
Owner GUANGXI YUCHAI MASCH CO LTD
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