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Fuel injection rate variable diesel fuel injection system and method for diesel engine

A diesel engine and injection system technology, applied in engine control, machine/engine, fuel injection control, etc., can solve problems such as not meeting the optimal requirements of the engine, and achieve the goal of reducing design difficulty, reducing driving peak torque, and improving reliability. Effect

Pending Publication Date: 2019-01-01
FAW JIEFANG AUTOMOTIVE CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] During a single fuel injection process, the fuel injection pressure of the conventional common rail fuel injection system is constant, so that the shape of the main injection fuel injection rate of the electronically controlled fuel injector is only a rectangle. This characteristic is very important for engine combustion, fuel economy and combustion noise. It has a direct impact and cannot meet the best requirements of the engine under all operating conditions

Method used

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  • Fuel injection rate variable diesel fuel injection system and method for diesel engine
  • Fuel injection rate variable diesel fuel injection system and method for diesel engine
  • Fuel injection rate variable diesel fuel injection system and method for diesel engine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: The low-pressure fuel rail 2 builds up a pressure of 500 bar under the action of the high-pressure oil pump 1, and the high-pressure fuel rail 3 builds up a pressure of 1000 bar under the action of the high-pressure oil pump 1. The electronic control unit ECU7 controls the electronically controlled fuel injector Ⅰ5 to open for 3000us, and electronic control after 2000us The unit ECU7 controls the electronic control injector Ⅱ4 to turn on for 1000us, and the electronic control unit ECU7 controls the electronic control injector Ⅰ5 and the electronic control injector Ⅱ4 to close simultaneously at 3000us.

Embodiment 2

[0034] Embodiment 2: The low-pressure fuel rail 2 builds up a pressure of 1200bar under the action of the high-pressure oil pump 1, and the high-pressure fuel rail 3 builds up a pressure of 2200bar under the action of the high-pressure oil pump 1. The electronic control unit ECU7 controls the electronically controlled fuel injector Ⅰ5 to open for 5000us, and electronic control after 3000us The unit ECU7 controls the electronic control injector Ⅱ4 to turn on for 2000us, and the electronic control unit ECU7 controls the electronic control injector Ⅰ5 and the electronic control injector Ⅱ4 to close at the same time at 5000us.

Embodiment 3

[0035] Example 3: The low-pressure fuel rail 2 builds up a pressure of 850bar under the action of the high-pressure oil pump 1, and the high-pressure fuel rail 3 builds up a pressure of 1600bar under the action of the high-pressure oil pump 1. The electronic control unit ECU7 controls the electronically controlled fuel injector Ⅰ5 to open for 4000us, and electronic control after 2500us The unit ECU7 controls the electronic control injector Ⅱ4 to turn on for 1500us, and the electronic control unit ECU7 controls the electronic control injector Ⅰ5 and the electronic control injector Ⅱ4 to close simultaneously at 4000us.

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Abstract

The invention discloses a fuel injection rate variable diesel fuel injection system and method for a diesel engine. The system comprises a high-pressure fuel pump, a low-pressure fuel rail, a high-pressure fuel rail, a first electric control fuel injector, a second electric control fuel injector, a one-way valve and an ECU. The high-pressure fuel pump is connected with the low-pressure fuel rail and the high-pressure fuel rail. The first electric control fuel injector is arranged above an engine combustor. The second electric control fuel injector is arranged in a pipeline between the high-pressure fuel rail and the first electric control fuel injector. The one-way valve is arranged in a pipeline between the low-pressure fuel rail and the first electric control fuel injector. The ECU is connected with the high-pressure fuel pump, the low-pressure fuel rail, the high-pressure fuel rail, the first electric control fuel injector and the second electric control fuel injector through wires.By means of the fuel injection rate variable diesel fuel injection system and method for the diesel engine, the fuel injection pressure is changed in the single fuel injection process by adoption ofthe two fuel rails and the two single-cylinder electric control fuel injectors while independence of diesel fuel injection pressure from the engine rotation speed is achieved, and finally the ideal continuously and flexibly variable fuel injection rate is obtained.

Description

technical field [0001] The invention belongs to the technical field of diesel injection systems for diesel engines, in particular to a variable fuel injection rate diesel injection system and injection method for diesel engines. Background technique [0002] With the increasingly stringent emission regulations, the limit value of exhaust pollutants is getting lower and lower, especially in recent years, the limit value of diesel engine exhaust pollutants (mainly particles and nitrogen oxides) has reached the level of China V or China VI. In order to reduce the above two exhaust pollutants at the same time and make engine emissions meet the requirements of emission regulations, electronically controlled high-pressure common rail injection technology has become one of the implementation strategies to meet emission regulations. [0003] Electronically controlled high-pressure common rail injection technology refers to a closed-loop system composed of high-pressure oil pump, hig...

Claims

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Application Information

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IPC IPC(8): F02D41/38
CPCF02D41/3827F02D41/3836F02D2041/3881
Inventor 尹燕升戈非朱宏志张弛
Owner FAW JIEFANG AUTOMOTIVE CO
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