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Electronic control injection control method for high pressure common rail diesel engine

A control method and high-pressure common rail technology, applied in the directions of fuel injection control, electrical control, engine control, etc., can solve the problems such as the inability of diesel engines to operate efficiently, the narrow variation range of exhaust back pressure, and the inability to match the control of fuel injection. Diesel engine power, the effect of reducing fuel consumption and emissions, and increasing power

Active Publication Date: 2020-10-27
中国船舶集团有限公司第七一一研究所 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional high-pressure common rail diesel engine has a narrow range of exhaust back pressure variation, and the control strategy of the existing electronically controlled injection system is not designed for a wide range of back pressure. Therefore, when the back pressure changes greatly, the existing control strategy cannot Optimum matching control of fuel injection due to changes in back pressure, so that the diesel engine cannot operate efficiently in the entire wide back pressure range

Method used

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  • Electronic control injection control method for high pressure common rail diesel engine
  • Electronic control injection control method for high pressure common rail diesel engine
  • Electronic control injection control method for high pressure common rail diesel engine

Examples

Experimental program
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Effect test

Embodiment 1

[0035] figure 1 It is a schematic flowchart of an electronically controlled injection control method for a high-pressure common rail diesel engine according to Embodiment 1 of the present invention.

[0036] like figure 1 As shown, the electronically controlled injection control method for a high-pressure common-rail diesel engine with a wide back pressure range according to this embodiment is used to control the common-rail rail pressure of the high-pressure common-rail diesel engine. The control method includes:

[0037] Firstly, the basic parameters of the diesel engine are obtained, the basic parameters exemplarily include the throttle position, exhaust back pressure and rotational speed of the diesel engine. The basic parameters of the diesel engine can be obtained through the control unit of the diesel engine, for example, the electronic control unit obtains the throttle position, etc., using methods commonly used in the field, which will not be repeated here.

[0038]...

Embodiment 2

[0067] figure 2 It is a schematic flowchart of an electronically controlled injection control method for a high-pressure common rail diesel engine according to Embodiment 2 of the present invention.

[0068] like figure 2 As shown, the electronically controlled injection control method for a high-pressure common-rail diesel engine with a wide back pressure range according to this embodiment is used to control the fuel injection quantity of the high-pressure common-rail diesel engine. The control method includes:

[0069] First, the basic parameters of the diesel engine are obtained, and the basic parameters include accelerator position, exhaust back pressure and rotational speed. The basic parameters are similar to those in Embodiment 1, and will not be repeated here.

[0070] Next, the basic value Qbasic of the fuel injection quantity is obtained according to the relationship between the basic parameter and the basic value of the fuel injection quantity and the obtained b...

Embodiment 3

[0086] image 3 It is a schematic flowchart of an electronically controlled injection control method for a high-pressure common rail diesel engine according to Embodiment 3 of the present invention.

[0087] like image 3 As shown, the electronically controlled injection control method for a high-pressure common-rail diesel engine with a wide back pressure range according to this embodiment is used to control the fuel injection timing of the high-pressure common-rail diesel engine. The control method includes:

[0088] Firstly, the basic parameters of the diesel engine and the current target fuel injection quantity are obtained, and the basic parameters include exhaust back pressure and rotational speed.

[0089] Next, a basic fuel injection timing value θbasic is obtained according to the fuel injection quantity and the relationship between the basic parameter and the basic fuel injection timing value and the obtained current target fuel injection quantity of the diesel engi...

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Abstract

The invention discloses an electric control injection control method of a high-pressure common rail diesel engine. The electric control injection control method is used for controlling the common railpressure, the oil spraying pulse width and the oil spraying timing of the high-pressure common rail diesel engine. According to the electric control injection control method, the basic values of therail pressure, the oil spraying pulse width and the oil spraying timing are obtained based on the exhaust back pressure, the rotating speed, the accelerator position or the oil amount, moreover, correction is carried out based on environmental parameters so that the proper rail pressure, the proper oil spraying pulse width and the proper oil spraying timing can be obtained correspondingly under various exhaust back pressures, then the oil spraying pulse, the oil spraying timing and the oil spraying rail pressure are subject to optimal control when a special-purpose diesel engine runs in a wideback pressure range working condition, and in the whole back pressure range, the power of the diesel engine is improved, the combustion in a cylinder is optimized, and oil consumption and emissions are reduced.

Description

technical field [0001] The invention relates to the technical field of fuel injection control for diesel engines, in particular to an electronic control method for high-pressure common rail diesel engines suitable for wide back pressure ranges. Background technique [0002] High-pressure common rail EFI technology refers to a fuel supply method that completely separates the generation of injection pressure from the injection process in a closed-loop system composed of a high-pressure oil pump, a pressure sensor and an electronic control unit. It uses a high-pressure oil pump to deliver high-pressure fuel to the public fuel supply pipe, and realizes precise control through the oil pressure in the public fuel supply pipe, so that the pressure of the high-pressure fuel pipe has nothing to do with the engine speed, which can greatly reduce the fuel supply pressure of the diesel engine. degree of change. The high-pressure common rail diesel engine is a diesel engine that adopts ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D41/40
CPCF02D41/3827F02D41/3845F02D41/40F02D41/401F02D2200/02F02D2200/0414F02D2200/101
Inventor 朱奎苏晓明王金亭黄伟王昌庆李静芬刘佳彬顾林林
Owner 中国船舶集团有限公司第七一一研究所