pneumatic actuator, force, pressure, stroke length. (original) (raw)
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Conversion Of Pneumatic To Electrically Actuated Waste Gated Turbo Charger
IJSRD, 2014
This paper presents the conversion of pneumatic actuated waste gated turbo charger to electrically actuated waste gated turbo charger using a DC brushed motor. In recent years, the turbo charger is one of the basic accessories in a heavy vehicle. Its function is to enable more amount of fresh charge and enhance the development of power. The need of compactness and higher efficiency for a turbocharger in automotive application allows reduction in power consumption. To address the above criteria, study has been carried out to develop a compact waste gate turbocharger which is electrically actuated. Electric actuator consists of a electric motor with speed reducing gear and a output linear actuator to operate the waste gate valve. The advantage over the conversion of pneumatic to electric are better response increase turbine efficiency The angle of valve opening can be manipulated as required ,enabling the turbocharger to run at its maximum efficiency speed for most time.
Design and Analysis of Hybrid Turbocharger
International Journal for Research in Applied Science & Engineering Technology (IJRASET), 2022
Internal Combustion engines have the capacity to exploit its increase in performance. Part ofwhich can be boosted by the technical solution that is turbocharging. To optimize the turbocharging to react as fast as possible and to adjust the volumetric flow of exhaust gases in the turbine, different alterations to turbochargers are done. To optimally support downsizing of Internal Combustion engines, these alterations are necessary. In a VGT there are vanes on the compressor that change the A/R of the turbo as needed. VGTs show a great improvement over conventional single turbocharger. Sequential turbocharger has an edge over VGT, but they are much more complicated. A 2.2L sequential turbocharged engine is same in performance as a 2.7L VGT engine. Exhaust gas turbocharging is a major technology for reducing fuel consumption and emissions in internal combustion engines, improving engine performance while cutting CO2 emissions. There are also electric turbochargers that almost totally eliminate turbo lag by using a motor to spin the compressor and use a generator on the turbine to recover exhaust gas energy. This application reduces fuel usage by up to 5% for driving cycles. EATC reduced the time it took to reach the optimum boost level during a load increase by up to 30%. Turbocharging is a major technology for reducing fuel consumption and emissions in internal combustion engines, improving engine performance while cutting CO2 emissions. Hybrid Turbocharging application leads to remarkable improvement at lowend torques, better engine performance and increased overall engine efficiency which paves way for downsizing of Internal Combustion engines.
Optimization of waste gate in the diesel engines with turbocharger
International journal of automotive engineering, 2016
The usage of turbochargers in diesel engines has led to the downsizing of the motors as well as usage of the waste gates in turbochargers. Any dimensional reduction in turbochargers and appurtenant leads to an enhancement on the performance of internal combustion engines and in environmental problems in terms of aerodynamic, thermodynamic and mechanical specifications for both engines and turbochargers. For this reason, the efforts need to be focused on the design of turbochargers and their waste gates accurately, in order to maintain its benefits as much as possible. The extent of waste gate opening, from full opened to closed valve, is demonstrated by the limiting compressor boost pressure ratio. Ultimately, an optimum point of limiting compressor boost pressure ratio is obtained then an increase in the values of BMEP and engine power for the same fuel consumption in range of waste gate opening is achieved
Dynamic design of electric turbo-compound
2019
Electric turbo-compounding is gaining popularity among hybrid vehicles. This device is composed of an electric machine - mounted on the shaft between the turbine and the compressor - that can operate both as a motor and as a generator. This allows recovering part of the thermal energy that otherwise would be discharged at the exhaust. In this way, the drivability and fuel consumption are improved. In this context, the Research Unit High Efficiency Hybrid Powertrain has been founded to develop new components to increase the efficiency of hybrid vehicles. Politecnico di Torino has been involved to study and design a prototype of a high-speed hysteresis machine for an electric turbo-compound. In the mechanical design of a high-speed electric machine different aspects must be considered: the machine works at 150000 rpm, and at this speed issues like vibration linked with rotordynamic and rotor failure because of high centrifugal forces may arise. To address these aspects, the present th...
Advanced Engine Technologies for Turbochargers Solutions
Applied Sciences, 2021
Research in the process of internal combustion engines shows that their efficiency can be increased through several technical and functional solutions. One of these is turbocharging. For certain engine operating modes, the available energy of the turbine can also be used to drive an electricity generator. The purpose of this paper is to highlight the possibilities and limitations of this solution. For this purpose, several investigations were carried out in the virtual environment with the AMESim program, as well as experimental research on a diesel engine for automobiles and on a stand for testing turbochargers (Turbo Test Pro produced by CIMAT). The article also includes a comparative study between the power and torque of the naturally aspirated internal combustion engine and equipped with a hybrid turbocharger. The results showed that the turbocharger has a very high operating potential and can be coupled with a generator without decreasing the efficiency of the turbocharger or t...
Energy, 2011
In the paper the results of an experimental investigation developed on a small turbocharger turbine for automotive application are presented, including the effect of the waste-gate valve opening. The study was focused on the evaluation of turbine efficiency, especially under unsteady flow conditions typically occurring in automotive turbocharged engines. Turbine efficiency values measured under steady and pulsating flow conditions are compared, also considering a quasi-steady flow approach.
Design and Performance Analysis on E-Tronic Turbocharger to eliminate Turbo Lag
2018
A turbocharger is a turbine which compresses and forces air into a combustion chamber of internal combustion engine which in turn increases the volumetric efficiency of a naturally aspirated engine. It uses exhaust gases to spool up the exhaust turbine and a compressor is coupled with the exhaust turbine which compresses the intake air which in turn lets higher fuel to burn efficiently in a smaller displacement engine, thus producing higher power. The electric turbocharger works like a normal turbocharger which spools up and compresses air into the engine. But instead of connecting the compressor directly to the exhaust turbine, the exhaust turbine is connected to a high current alternator and runs a high-speed motor at the intake compressor. This reduces the spooling time of a turbocharger eliminating turbo lag which is in conventional turbocharger. The present work is focussed on design and performance analysis on E-tronic turbocharger to eliminate turbo lag.
2012
The choice of technology for automotive actuators is driven by the need of high power to size ratio. In general, electro-pneumatic actuators are preferred for application around the engine as they are compact, powerful and require simple controlling devices. Specially, Variable Geometry Turbochargers (VGTs) are almost always controlled with electro-pneumatic actuators. This is a challenging application because the VGT is an important part of the engine air path and the latter is responsible for intake and exhaust air quality and exhaust emissions control. With government regulations on vehicle pollutant emissions getting stringent by the year, VGT control requirements have also increased. These regulations and requirements can only be fulfilled with precise dynamic control of the VGT through its actuator. The demands on actuator control include robustness against uncertainty in operating conditions, fast and smooth positioning without vibration, limited number of measurements. Added...
Active Control Turbocharger for Automotive Application: An Experimental Evaluation
8th International Conference on Turbochargers and Turbocharging, 2006
The current paper presents the results from a comprehensive set of experimental tests on a prototype active control turbocharger. This is a continuing series of test work as part of the development of this new type of turbocharger. Driven by the need to comply to increasingly strict emissions regulations as well as a continuing strive for better overall performance the active control turbocharger is intended to provide an improvement over the current state-of-the-art in turbocharging. In this system, the nozzle is able to alter the throat inlet area of the turbine according to the pressure variation of each engine exhaust gas pulse thus imposing a substantially more 'active' form of control of the conditions at the turbine rotor inlet.