EGR control system for internal combustion engine instantaneous conditions

Abstract

The invention relates to an EGR control system for internal combustion engine instantaneous conditions, and belongs to the field of emission control over the internal combustion engine instantaneous conditions. A high speed revolution speed sensor, a high speed torque sensor, four high response electronic control EGR valves and an ECU with smoke intensity control MAP are additionally arranged on the basis of an existing EGR control system, the four high response electronic control EGR valves are connected to an outlet of a filter and one inlets of three air inlet three-way tubes through pipes in parallel, and the ECU is respectively and elastically connected with an internal combustion engine, a high response revolution speed sensor, a high response torque sensor and the four high response electronic control EGR valves. According to the EGR control system, carbon smoke emission under the internal combustion engine instantaneous conditions can be effectively controlled, NOx emission is reduced to the greatest extent, and noxious substance emission of the internal combustion engine is reduced.

Description

technical field

[0001] The invention belongs to the field of emission control of internal combustion engines in transient working conditions, and in particular relates to a transient emission control system based on the feedback control of EGR gear opening and closing based on smoke emission limit value. Background technique

[0002] Due to the advantages of strong power, good economy and high reliability, the internal combustion engine has attracted much attention, and its share in the automotive engine market is increasing. However, automotive diesel engines are in transient conditions most of the time, especially On urban roads, the load and speed of the engine change more frequently. The supercharged internal combustion engine works under transient conditions, and its combustion and emission performance will be distorted differently from the steady state conditions. With the increasingly stringent emission regulations of vehicle diesel engines, the emissions of internal ...

Examples

Embodiment 1

[0041] refer to figure 1 , an EGR control system for an internal combustion engine under transient conditions, comprising an internal combustion engine 1, an intake manifold 2 and an exhaust manifold 18 connected to the internal combustion engine 1, a high-response rotational speed sensor 3 and a high-response torque sensor 4 arranged on the internal combustion engine 1, Air intake intercooler 5, electronic control unit ECU6, EGR intercooler 7, filter 8, four high-response electronically controlled EGR valves 9, 10, 11, 12, air filter 13, intake tee pipe 14 , compressor 15, turbine 16, tee pipe 17;

[0042]The inlet of the three-way pipe 18 is connected with the discharge main pipe 18, and the two outlets are respectively connected with the inlets of the turbine 16 and the EGR intercooler 7, and the inlet of the filter 8 is connected with the outlet of the EGR intercooler 7 The four high-response electronically controlled EGR valves 9, 10, 11, 12 are connected to the outlet ...

experiment example 1

[0051] The detailed working process under the transient condition with loading time of 2s is as follows:

[0052] (1) First, according to the actual needs of the smoke control target and the test calibration value, set the upper limit value of the smoke level, the upper limit value of the smoke level control area and the lower limit value of the smoke level control area in the electronic control unit (ECU) 6 . In this embodiment, the upper limit value of smoke is 10% (extinction smoke value), the upper limit of smoke control area is 8%, and the lower limit of smoke control area is 4%;

[0053] (2) Electronic control unit (ECU) 6. Collect the speed, torque and EGR gear signal of the diesel engine. When the torque transient rate of the engine is detected to be 278N.m·s -1 , it is determined that the engine is in a transient condition, and the following commands are quickly executed:

[0054] (3) The electronic control unit (ECU) 6 estimates the rapid smoke value according to th...

experiment example 2

[0059] The detailed working process under the transient condition with loading time of 10s is as follows:

[0060] (1) First, according to the actual needs of the smoke control target and the test calibration value, set the upper limit value of the smoke level, the upper limit value of the smoke level control area and the lower limit value of the smoke level control area in the electronic control unit (ECU) 6 . In this embodiment, the upper limit value of smoke is 10% (extinction smoke value), the upper limit of smoke control area is 8%, and the lower limit of smoke control area is 4%;

[0061] (2) Electronic control unit (ECU) 6. Collect the speed, torque and EGR valve opening signal of the diesel engine. When the torque transient rate of the engine is detected to be 55.6N.m·s -1 , it is determined that the engine is in a transient condition, and the following commands are quickly executed:

[0062] (3) The electronic control unit (ECU) 6 estimates the quick smoke value acco...

technical field

[0001] The invention belongs to the field of emission control of internal combustion engines in transient working conditions, and in particular relates to a transient emission control system based on the feedback control of EGR gear opening and closing based on smoke emission limit value. Background technique

[0002] Due to the advantages of strong power, good economy and high reliability, the internal combustion engine has attracted much attention, and its share in the automotive engine market is increasing. However, automotive diesel engines are in transient conditions most of the time, especially On urban roads, the load and speed of the engine change more frequently. The supercharged internal combustion engine works under transient conditions, and its combustion and emission performance will be distorted differently from the steady state conditions. With the increasingly stringent emission regulations of vehicle diesel engines, the emissions of internal ...

Examples

Embodiment 1

[0041] refer to figure 1 , an EGR control system for an internal combustion engine under transient conditions, comprising an internal combustion engine 1, an intake manifold 2 and an exhaust manifold 18 connected to the internal combustion engine 1, a high-response rotational speed sensor 3 and a high-response torque sensor 4 arranged on the internal combustion engine 1, Air intake intercooler 5, electronic control unit ECU6, EGR intercooler 7, filter 8, four high-response electronically controlled EGR valves 9, 10, 11, 12, air filter 13, intake tee pipe 14 , compressor 15, turbine 16, tee pipe 17;

[0042]The inlet of the three-way pipe 18 is connected with the discharge main pipe 18, and the two outlets are respectively connected with the inlets of the turbine 16 and the EGR intercooler 7, and the inlet of the filter 8 is connected with the outlet of the EGR intercooler 7 The four high-response electronically controlled EGR valves 9, 10, 11, 12 are connected to the outlet ...

experiment example 1

[0051] The detailed working process under the transient condition with loading time of 2s is as follows:

[0052] (1) First, according to the actual needs of the smoke control target and the test calibration value, set the upper limit value of the smoke level, the upper limit value of the smoke level control area and the lower limit value of the smoke level control area in the electronic control unit (ECU) 6 . In this embodiment, the upper limit value of smoke is 10% (extinction smoke value), the upper limit of smoke control area is 8%, and the lower limit of smoke control area is 4%;

[0053] (2) Electronic control unit (ECU) 6. Collect the speed, torque and EGR gear signal of the diesel engine. When the torque transient rate of the engine is detected to be 278N.m·s -1 , it is determined that the engine is in a transient condition, and the following commands are quickly executed:

[0054] (3) The electronic control unit (ECU) 6 estimates the rapid smoke value according to th...

experiment example 2

[0059] The detailed working process under the transient condition with loading time of 10s is as follows:

[0060] (1) First, according to the actual needs of the smoke control target and the test calibration value, set the upper limit value of the smoke level, the upper limit value of the smoke level control area and the lower limit value of the smoke level control area in the electronic control unit (ECU) 6 . In this embodiment, the upper limit value of smoke is 10% (extinction smoke value), the upper limit of smoke control area is 8%, and the lower limit of smoke control area is 4%;

[0061] (2) Electronic control unit (ECU) 6. Collect the speed, torque and EGR valve opening signal of the diesel engine. When the torque transient rate of the engine is detected to be 55.6N.m·s -1 , it is determined that the engine is in a transient condition, and the following commands are quickly executed:

[0062] (3) The electronic control unit (ECU) 6 estimates the quick smoke value acco...

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