General Circumstance Of The Growth Of VGT Turbocharger Control Equipment Abroad
Foreign nations have constantly been in a leading position in the research as well as the advancement of VGT turbocharger (variable geometry turbochargers) control systems. The USA, Germany, as well as Japan, have actually established a selection of typical and also sensible variable nozzle turbocharger control systems.
Honeywell established a VGT turbocharger system in the last century, which is generally composed of nozzle vane actuators, PCM valves, air pumps, control systems, sensing units and different tools. The nozzle vane actuator embraces a diaphragm-type negative stress actuator, as well as the actuator, is powered by a vacuum pump installed at the back side of the generator. A PCM shutoff is mounted in between the actuator and also the vacuum pump to control the negative pressure of the actuator.
The control unit sends out a control signal to the PCM valve according to the engine sensor signal and also adjusts the unfavourable stress produced by the vacuum pump by altering the time proportion of opening and closing of the PCM shutoff, consequently managing the angle of the nozzle vanes. The control system takes the boost stress as the control target parameter.
To improve the stability and also the level of smoothness of the system under non-steady state problems, a feedforward PI control formula is used: the engine speed and tons are determined under steady-state conditions. The nozzle opening lots proportion is utilized as feedforward and also added to the PI control algorithm to understand the control of the PCM shutoff.
American GM has likewise established a VGT turbocharger system for gas engines. The system includes an actuator, digital pressure regulatory authority (EPR), digital vacuum regulator (EVR), digital control device and sensing units.
The difference between the system diaphragm type stress actuator and the previous diaphragm type actuator is that the actuator air chamber is split into two parts by the diaphragm, and the diaphragm is at the same time influenced by the consumption manifold and the booster from the air consumption manifold before the compressor after the throttle shutoff.
The pressure difference between both air chambers of the compressed intake manifold presses the diaphragm to drive the nozzle ring blades to revolve, to ensure that the pneumatic actuator can efficiently conquer the resistance from the nozzle pull pole under various functioning problems.
On top of that, the pressure in both air chambers is regulated by EPR and also EVR, respectively. The control method is to first create a steady-state working problem increase stress control MAP map and store it in the ECM, contrast the present boost pressure with the target increase stress in the ECM, as well as the digital control package readjusts the control signal according to the distinction to make the execution The controller acts to recognize the ideal control of boost high pressure.
Additionally, Japan Ishikawajima-Harima Heavy Industries Co., Ltd. also used fuzzy control to a six-cylinder diesel motor power equipped with a VNT turbo, using a stepping electric motor to drive the actuator, and accomplished excellent control results.
Figure 1 - VGT Turbocharger
Study Status Of Domestic VNT Turbocharger Control System
Residential study on VNT turbochargers is a little behind international nations, as well as there are a couple of systems taking part in this research study. Among them, Tsinghua University, Beijing Institute of Innovation, Tongji University and various other schools have actually done some work in the VGT control system.
In 1995, Wang Junqiu of the Beijing Institute of Innovation as well as others developed a VGT control system. The system consists of a digital control device ECU, turbine section opening actuator (torque electric motor), sensor and control object J6110Z diesel motor and so on.
The system approves signals such as engine speed, boost pressure at the compressor end, as well as variation of the nozzle blade actuator at the wind turbine end. Through a particular formula, the control signal result in the nozzle blade actuator changing the rotation angle of the nozzle ring blades, thereby regulating the turbine nozzle opening.
In 2000, Ma Zhaochen from the Beijing Institute of Innovation and also others designed a mechanical beginning control system for the VGT matched to the J6110Z six-cylinder diesel motor. The position of the nozzle ring blade of the supercharger is regulated by a swing pole, which embraces the lever principle.
Both ends of the swing rod are the nozzle ring blade as well as the spring respectively. The balance of the pressure difference throughout the actuator diaphragm drives the nozzle ring vanes to rotate. The layout factor of the turbocharger is picked at the calibration point, at which time the tension of the spring is stabilized with the compressor electrical outlet stress acting on the diaphragm.
The State Secret Laboratory of Auto Safety and also Energy Conservation of Tsinghua University has developed the VGT turbocharger control system on the Volkswagen TDI engine, which is identified by utilizing a stepper motor as the actuator, and examining the MAP map with both signals of the engine speed sensing unit and also the accelerator placement sensor., get the target boost pressure, and perform PID control.
In the consistent state, the PID control with the change of the variable nozzle opening is adopted to achieve excellent command of the target increase pressure. In the transient condition, the control technique of PID specifications varies from the consistent state as well as the introduction of the forecast function is taken on to enhance the feedback rate of the system in the transient condition, as well as the test, is executed on the developed software application and hardware system.
Epilogue
Variable nozzle exhaust gas turbocharging innovation has a larger area than standard exhaust gas turbochargers in terms of power saving and also emission decrease of internal combustion engines. It is the present growth direction of turbocharging modern technology.
Its research and development are of fantastic importance to promoting the updating of China's VGT turbocharger market. After years of technical build-up abroad, the variable nozzle turbocharger is much ahead of China in regards to general innovation and control innovation, while the research study on variable nozzle turbochargers in my nation is just in the academic research study stage.
Honeywell has actually created a VGT turbocharger system in the last century, which is generally made up of nozzle vane actuators, PCM valves, vacuum pumps, control units, sensing units as well as various instruments. The nozzle vane actuator embraces a diaphragm-type negative stress actuator, and also the actuator is powered by a vacuum cleaner pump set up at the rear end of the generator. A PCM valve is set up in between the actuator as well as the vacuum cleaner pump to control the unfavourable pressure of the actuator.
The 2 ends of the swing pole are the nozzle ring blade and also the spring respectively. The balance of the pressure distinction throughout the actuator diaphragm drives the nozzle ring vanes to rotate.
Figure 2 - CAT C15 Acert Turbocharger
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