Control system and control method for reducing smoke in transient conditions of diesel engine

A control system and transient working condition technology, applied in engine control, electrical control, fuel injection control, etc., can solve problems such as smoke deterioration, torque response lag, etc., to improve emissions, reduce lag, and increase in-cylinder heat status effect

Active Publication Date: 2018-03-30
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of torque response lag and smoke deterioration under the current diesel engine transient conditions, propose a control system for reducing diesel engine smoke under transient conditions, and provide a control system based on the control system, With smoke and CA50 as control targets, a closed-loop control method that simultaneously reduces diesel engine smoke under transient conditions and improves engine torque responsiveness

Method used

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  • Control system and control method for reducing smoke in transient conditions of diesel engine
  • Control system and control method for reducing smoke in transient conditions of diesel engine
  • Control system and control method for reducing smoke in transient conditions of diesel engine

Examples

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Effect test

Embodiment 1

[0035] refer to figure 1 , a control system for reducing smoke in transient operating conditions of a diesel engine, including an engine 1, an air filter 2, a compressor 3, a turbine 7 coaxially connected with the compressor 3, an air intake intercooler 4, and an output High-response speed sensor 8 and high-response torque sensor 9 on the shaft, cylinder pressure sensor 10 installed on the cylinder block, ECU electronic control unit 11, charge amplifier 12, single-chip microcomputer 13 with CA50 calculation program, installed on the engine flywheel The crankshaft position sensor 14;

[0036] The air filter 2 is communicated with the intake manifold 5 on the engine 1 through the compressor 3 and the air intake intercooler 4 in sequence, and the turbine 7 is communicated with the exhaust manifold 6 on the engine 1 ;

[0037] The high-response speed sensor 8 and the high-response torque sensor 9 are respectively connected to the ECU electronic control unit 11 in communication; ...

Embodiment 2

[0040] A closed-loop control method based on the control system of the present invention is based on smoke and CA50 (the crankshaft angle corresponding to 50% mass fraction of diesel fuel combustion) as control targets, and adopts a three-stage broken-line loading strategy to adjust the fuel supply rate to achieve the loading rate (unit time torque rate of change), including the following steps: (refer to figure 2 )

[0041] 1), first, according to the engine development requirements, set the smoke level target value and the CA50 target value of each working condition in the ECU electronic control unit 11;

[0042] 2), the ECU electronic control unit 11 collects the engine torque signal through the high-response torque sensor 9, and calculates the initial loading rate of the engine according to the loading rate calculation formula (1), and performs the first stage loading on the engine with this loading rate,

[0043]

[0044] Where: ΔT tq is the change value of the torque...

Embodiment 3

[0054] A diesel engine runs at a constant speed with increased torque (loading), where the constant speed is 1650r / min, the torque increases from 10% of the maximum torque value to 100%, that is, from 10% load to 100% load, and the loading time is 5s; According to the actual needs of the engine, the smoke target value is 10%.

[0055] 1. First, according to the requirements of engine development, set the target value of smoke level in the ECU electronic control unit to 10% and input the CA50 value of each working condition;

[0056] 2. The ECU electronic control unit collects the engine torque signal through the high-response torque sensor, and uses the loading rate calculation formula (1) to calculate the initial loading rate of the engine as 665N·m / s, and uses this loading rate for the first stage of loading. At this time, the ECU electronic control unit collects the instantaneous smoke level of the engine as 12%, which exceeds the smoke target value by 10%. The ECU electron...

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Abstract

The invention belongs to the emission control technology of an internal combustion engine in a transient working condition, and in particular relates to a control system and a control method for reducing smoke in a diesel engine in a transient working condition. It consists of an engine, an air filter, a compressor, a turbine coaxially connected with the compressor, an intake intercooler, a high-response speed sensor and a high-response torque sensor set on the output shaft, and a cylinder set on the cylinder block. pressure sensor, ECU electronic control unit, charge amplifier, single-chip microcomputer with CA50 calculation program, and crankshaft position sensor set on the engine flywheel; rotation angle) as the control target, the three-stage broken-line loading strategy is adopted to adjust the fuel supply rate to realize the change of the loading rate, and at the same time, it can reduce the smoke of the diesel engine under transient conditions and improve the engine torque response, which overcomes the shortcomings of the existing technology that cannot be balanced. .

Description

technical field [0001] The invention belongs to the emission control technology of internal combustion engines in transient working conditions, and in particular relates to a control system capable of reducing smoke in transient working conditions of diesel engines, and the smoke and CA50 (the crankshaft angle corresponding to 50% mass fraction of diesel combustion) are used as the The control method of the control target. Background technique [0002] Due to the advantages of strong power, good reliability and high thermal efficiency, diesel engines are taking an increasing share in the automotive engine market, with promising prospects. However, in the actual work process, vehicle diesel engines are in transient conditions most of the time, especially when running on urban roads, the speed and load change frequently, and most of the emissions are in the short-term transient state where the speed or torque changes sharply. process generated. With the increasingly severe e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D41/14F02D41/30
Inventor 刘忠长丁云龙田径许允张龙平韩恒牛吉祥亓升林
Owner JILIN UNIV
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