System and method for cooperatively controlling supercharged diesel engine EGR valve, VGT and throttle valve

An EGR valve and collaborative control technology, applied in electrical control, engine control, mechanical equipment, etc., can solve problems such as complex coupling relationship, difficulty in recirculating exhaust gas, and difficulty in optimized application, so as to reduce pumping loss, reduce calibration workload, Improve the effect of the control effect

Inactive Publication Date: 2014-11-19
JILIN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The cooperation between EGR valve, VGT and throttle valve can solve this problem, but the three have cross-effects on MAF, backflow exhaust gas volume and boost pressure, and the coupling relationship is very complicated
The traditional single-input single-output strategy is very difficult to control MAF and return exhaust gas at t

Method used

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  • System and method for cooperatively controlling supercharged diesel engine EGR valve, VGT and throttle valve
  • System and method for cooperatively controlling supercharged diesel engine EGR valve, VGT and throttle valve
  • System and method for cooperatively controlling supercharged diesel engine EGR valve, VGT and throttle valve

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Embodiment Construction

[0035] specific implementation plan

[0036] The present invention will be further described below in conjunction with the accompanying drawings.

[0037] like figure 1 As shown, the supercharged diesel engine EGR valve, VGT and throttle cooperative control system of the present invention consists of an electronically controlled EGR valve 1, a throttle valve 2, a variable geometry supercharger (VGT) 3, a compressor 4, a cooler 5, Tee 6, engine exhaust manifold 7, engine intake manifold 8, EGR valve VGT throttle electronic control unit 9, operating condition judgment unit 10, air flow sensor 11, engine speed sensor 12, accelerator pedal position sensor 13, engine torque The sensor 14, the CAN bus 15 and the start switch 16 are composed, wherein the accelerator pedal position sensor 13 is connected with the working condition judging unit 10; the air flow sensor 11, the engine speed sensor 12 and the engine torque sensor 14 are connected with the EGR valve VGT throttle electro...

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Abstract

The invention discloses a diesel engine air inlet and outlet control system. The diesel engine air inlet and outlet control system comprises an exhaust gas recirculation (EGR) valve, a variable geometry turbocharger (VGT) and a throttle valve to adjust the mass air flow (MAF) flowing into an engine. The engine control system comprises a first module and a second module, wherein the first module is a working condition state monitoring module based on position signals of an accelerator pedal and is used for judging whether the engine is in an urgent acceleration condition or not, the second module is used for adopting a transient open-loop control strategy under the urgent acceleration condition or an EGR valve, VGT and throttle valve cooperative control strategy with the difference of the MAF target value and the measured value as the control input according to the judgment result of the working condition of the first module, wherein the transient open-loop control strategy can improve the air inlet system reaction speed and optimize the transient smoke exhausting, and according to the EGR valve, VGT and throttle valve cooperative control strategy, the EGR valve is taken as the principal thing, VGT flow area adjusting is taken as the secondary thing, throttle valve control is taken as the auxiliary thing, and an MAF is accurately controlled. By means of the method, the complete opening state of the throttle valve can be kept as much as possible, the throttling loss can be reduced, and the purposes of improving the fuel economy and reducing standardized workloads are achieved.

Description

technical field [0001] The invention belongs to the technical field of intake and exhaust feedback control of diesel engines, and in particular relates to a system and method for cooperative control of an exhaust gas recirculation (EGR) valve, a variable geometry supercharger (VGT) and a throttle valve. Background technique [0002] The Exhaust Gas Recirculation (EGR) system can improve the operation of diesel engines and reduce NOx emissions. Supercharging technology can increase the intake air density, mass air flow (MAF) and power of diesel engines, and exhaust gas turbocharging is widely used in automotive diesel engines. In addition to effectively solving the problems of insufficient low-speed torque, poor part-load economy, and slow transient response that exist in the matching of ordinary turbochargers and diesel engines, VGT can also effectively solve the problem of exhaustion in some working conditions. To solve the problem of air pressure deficit, increase the rang...

Claims

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Application Information

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IPC IPC(8): F02D43/00F02D13/00F02D23/00F02D21/08
CPCY02T10/12
Inventor 赵靖华洪伟谭振江于晓鹏梁海英解方喜李小平王海燕
Owner JILIN NORMAL UNIV
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