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Segmented rail for high-pressure common rail system and control method of segmented rail

A high-pressure common rail system and segmented technology, applied in electrical control, charging system, engine control, etc., can solve problems such as poor stability and consistency, and achieve increased fuel injection rate, improved stability, and improved consistency sexual effect

Pending Publication Date: 2021-01-26
TIANJIN UNIV OF TECH & EDUCATION TEACHER DEV CENT OF CHINA VOCATIONAL TRAINING & GUIDANCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a segmented rail for a high-pressure common rail system and its control method for the technical defects of poor stability and consistency of fuel injection in a high-pressure common rail system for a high-power diesel engine

Method used

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  • Segmented rail for high-pressure common rail system and control method of segmented rail
  • Segmented rail for high-pressure common rail system and control method of segmented rail
  • Segmented rail for high-pressure common rail system and control method of segmented rail

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A segmented rail for a high-pressure common rail system, such as figure 1 with figure 2 As shown, it includes a segmented rail body 1 and a high-pressure conversion interface 2 and a check valve 3 that are sealed and installed on the segmented rail body 1;

[0034] The segmented rail body 1 is hollow to form an accumulator volume chamber 4 for containing high-pressure fuel, and the volume of the accumulator volume chamber 4 is greater than or equal to 40 times the maximum fuel injection volume per cycle of the electronically controlled injector;

[0035] The one-way valve 3 communicates with the accumulator volume chamber 4, and high-pressure fuel enters the accumulator volume chamber 4 in one direction through the one-way valve 3; The high-pressure fuel in the accumulator volume chamber 4 flows out through the high-pressure conversion interface 2 and enters the electronically controlled fuel injector.

[0036] Since the volume of the accumulator volume chamber 4 is ...

Embodiment 2

[0038] This embodiment introduces its detailed structure on the basis of Embodiment 1.

[0039] Specifically, as image 3 As shown, the segmented rail body 1 is a "T"-shaped structure, including an integrally connected rail body body 1-1 and a one-way valve connecting body 1-2 for installing the one-way valve 3; The pressure-volume cavity 4 is located in the rail body 1-1, and the rail body 1-1 is provided with an installation port 1-3 for installing the high-voltage conversion interface 2.

[0040] Specifically, as Figure 4 As shown, the installation port 1-3 includes a threaded area 1-3-1, a tapered surface 1-3-2, and a plane 1-3-3 from bottom to top, and the high-pressure conversion interface 2 and the threaded area 1 - 3-1 threaded connection, and press against the tapered surface 1-3-2 to form a seal, and the flat surface 1-3-3 is to facilitate tight installation with the high-pressure conversion interface 2.

[0041] As a preference, both ends of the rail body 1-1 ar...

Embodiment 3

[0049] This embodiment introduces its control method based on Embodiment 2.

[0050] The above-mentioned high-pressure common rail system uses the segmented rail control method. When the fuel pressure outside the check valve 3 is greater than the fuel pressure in the accumulator volume chamber 4, the check valve 3 is opened, and the high-pressure fuel passes through the check valve. 3 One-way entry into the accumulator volume chamber 4 for high-pressure fuel replenishment;

[0051] When the fuel pressure outside the check valve 3 is less than or equal to the fuel pressure in the accumulator volume chamber 4, the check valve 3 is closed without affecting the fuel pressure of adjacent electronically controlled injectors.

[0052] Specifically, the fuel pressure outside the one-way valve 3 refers to the pressure F of the high-pressure fuel at the inlet 3-1-1 of the one-way valve cap 3-1 acting on the ball valve 3-2. 1 .

[0053] The fuel pressure in the accumulator volume chamb...

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Abstract

The invention discloses a segmented rail for a high-pressure common rail system. The segmented rail comprises a segmented rail body, a high-pressure conversion connector and a one-way valve, wherein the high-pressure conversion connector and the one-way valve are installed on the segmented rail body in a sealed mode; the segmented rail body is hollow to form a pressure accumulation volume cavity used for containing high-pressure fuel oil, and the high-pressure fuel oil enters the pressure accumulation volume cavity in a one-way mode through the one-way valve; and the high-pressure fuel oil inthe pressure accumulation volume cavity flows out through the high-pressure conversion connector and enters an electric control oil sprayer; and the volume of the pressure accumulation volume cavity is larger than or equal to 40 times of the maximum oil spraying amount per cycle of the electric control oil sprayer. According to the segmented rail for the high-pressure common rail system, high-pressure fuel oil pressure drop caused by oil spraying each time can be effectively reduced, the stability of fuel oil spraying can be improved, and the fuel oil spraying speed can be increased. Meanwhile, due to the effect of the one-way valve in the segmented rail for the high-pressure common rail system, the pressure change of the high-pressure fuel oil in the pressure accumulation volume cavity cannot influence the pressure of the high-pressure fuel oil in the pressure accumulation volume cavity in the adjacent segmented rail, and the consistency of fuel oil spraying of the high-pressure common rail system can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of high-pressure fuel supply for high-power diesel engines, in particular to a segmented rail for a high-pressure common rail system and a control method thereof. Background technique [0002] In the high-pressure common rail system for high-power diesel engines, due to the structural size of the high-power diesel engine, the size of the high-pressure common-rail pipe is relatively long, which increases the processing difficulty of the high-pressure common-rail pipe and increases the manufacturing cost of the high-pressure common-rail pipe; at the same time, The high-pressure common rail system for high-power diesel engines has a large amount of fuel injection per cycle, resulting in a large pressure drop in the high-pressure common rail pipe, which directly affects the stability and consistency of fuel injection, and also causes a drop in fuel injection rate. Contents of the invention [0003] The object ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M55/02F02M55/00F02M63/00F02D41/38
CPCF02D41/3863F02M55/005F02M55/025F02M63/005F02M63/0054F02M63/007
Inventor 李汝宁
Owner TIANJIN UNIV OF TECH & EDUCATION TEACHER DEV CENT OF CHINA VOCATIONAL TRAINING & GUIDANCE
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