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Rail pressure control method of high-pressure common-rail diesel engine

A high-pressure common rail and diesel engine technology, which is applied in engine control, electrical control, fuel injection control, etc., can solve the problem that the effect of rail pressure stability needs to be improved, and achieve good stability

Active Publication Date: 2021-09-03
CHINA NORTH ENGINE INST TIANJIN
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  • Application Information

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Problems solved by technology

The problem in the prior art is that the responsiveness and followability when the target rail pressure changes suddenly, and the effect of rail pressure stability under stable working conditions need to be improved

Method used

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  • Rail pressure control method of high-pressure common-rail diesel engine
  • Rail pressure control method of high-pressure common-rail diesel engine
  • Rail pressure control method of high-pressure common-rail diesel engine

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Embodiment Construction

[0024] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0025] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0026] A rail pressure control method of a high-pressure common rail diesel engine provided by the present invention includes the following contents:

[0027] According to the different working conditions of the diesel engine, the rail pressure control strategy of the high-pressure common rail diesel engine is determined:

[0028] The engine starting condition adopts open-loop control;

[0029] The working condition after starting adopts closed-loop control.

[0030] Specifically, at the initial stage of engine starting, the engine speed is low and the pressure in the common rail is low. In order to make the engine start quickly, an open-loop control strategy is adopted. That is, the ...

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Abstract

The invention provides a rail pressure control method of a high-pressure common-rail diesel engine. The rail pressure control method comprises the following steps that according to different working conditions of the diesel engine, the following rail pressure control strategies of the high-pressure common-rail diesel engine are determined, specifically, if the working condition is the engine starting working condition, open-loop feedforward control is adopted, that is, a proportional valve connected with a high-pressure pump is controlled to be not powered on, and the valve is completely opened; if the working condition is the working condition after starting, closed-loop rail pressure fuzzy self-adaptive PID control is adopted, that is, the proportional valve is powered on, the opening degree of the proportional valve is controlled, and the rail pressure is stabilized within a certain error range of a rail pressure target value; specifically, the rail pressure target value is calculated according to the operation working condition, the current oil injection quantity and engine rotating speed information; and then the rail pressure target value, the current rail pressure actual value and the circulating oil injection quantity information are input into a rail pressure controller to be compared, and the opening degree of the proportional valve is controlled through a deviation signal. According to the rail pressure control method, the responsiveness and the following performance during sudden change of the target rail pressure and the stability of the rail pressure under the stable working condition are better.

Description

technical field [0001] The invention belongs to the technical field of diesel engine control, and in particular relates to a rail pressure control method of a high-pressure common rail diesel engine. Background technique [0002] The high-pressure common rail electronic control system can control the common rail pressure of the diesel engine, realize precise control of the cycle fuel injection volume control, fuel injection timing, etc., so that the economy and power of the diesel engine can be significantly improved. Rail pressure control is the core part of the control strategy of high pressure common rail system, mainly including rail pressure responsiveness and rail pressure stability. [0003] Rail pressure response control means that the diesel engine can quickly build up high pressure when starting, and the rail pressure can quickly follow the target pressure when the operating mode is switched; rail pressure stability means that the diesel engine keeps the actual rai...

Claims

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Application Information

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IPC IPC(8): F02D41/38F02D41/14F02D41/24
CPCF02D41/3836F02D41/1401F02D41/2451F02D41/3827F02D2041/1409F02D2200/0614F02D2200/101F02D2200/0606F02D2200/703F02D2041/141
Inventor 李菲菲和龙阴晋冠贾利邢璐刘涛吕慧
Owner CHINA NORTH ENGINE INST TIANJIN
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