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The Modified Phan-Thien and Tanner model applied to turbochargers thrust bearing
In this paper, an unsteady thermohydrodynamic formulation of a turbocharger’s thrust bearing contact is presented. The Modified Phan-Thien and Tanner model takes into account complex rheological characteristics of the lubricant, transient aspects and inertia effects due to the very high rotational speed. An extensive rheological testing campaign was performed to get data as input for the numerical model. The results obtained from this model are compared to experimental data provided by a thrust bearing rig. It shows acceptable correlation between prediction and test data of axial thrust load versus thrust bearing oil film thickness for two typical turbocharger frame sizes.
An Ultra-low Inertia Turbocharger Compatible with Exhaust Pulse Separation
DualBoostTM is an Ultra-Low Inertia concept for Gasoline Boosting
– The first Mono-scroll version was presented in 2011/2012
– Mono-scroll range DB14-DB22 was exhibited in Vienna in 2013
– The concept is now reaching aerodynamic and mechanical maturity
• DualBoostTM Twin-Flow
– Flow seperation can be applied to the DualBoost concept
– DualBoost is a valid concept for Mono & Twin-Flow applications
• Meridional Division shows some advantages in performance todate
• Sector Division remains interesting for further development
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GTD10: The Smallest Honeywell VNT™ Turbo Designed for C02 Reduction
GTD range, the latest Honeywell VNT generation designed for EU6 applications, now includes the smallest VNT turbo from Honeywell. This new product has been designed to reduce fuel consumption and provide better transient response, enabling further downsizing. The GTD10 can be matched as a single VNT turbo for engine power rating between 45 to 65kW or as High Pressure Turbo for Two-Stage engine power rating between 110 to 120kW.
Development of a Common Dual Axle VNT™ for Single and Two-Stage Off-Highway Applications
Honeywell launched the latest generation DutyDrive VNT for off-highway on John Deere's 9.0L Tier4 engine. Developments made to the VNT stage resulted in improved efficiency and allowed over 20 unique power ratings, including both two-stage and single stage air systems, with the same turbo design. The turbo also features an integrated electro-hydraulic actuation system developed to operate in high-temperature, high-vibration environments in a compact package size.
Shaft Coking Resolution using Multiple Variable Bearing System Design Optimization for CV Turbochargers
Honeywell has been able to find a solution to the shaft coking problem in CV using innovative prediction capabilities including advanced rotor-dynamic analysis coupled with shaft thermal prediction. This led to significant saving in development and testing time and provided a robust bearing system in the first attempt.
Transient Response of Turbocharger Turbines
The transient response of turbocharged engines is becoming critical to passenger vehicles because of the recent trend in engine downsizing and the expansion of gasoline turbocharging. Honeywell has examined the transient behavior of turbo turbines through Newton’s equation of motion and has identified a single non-dimensional variable controlling the transient. The effects of various parameters on turbine acceleration are discussed and viable options to improve engine acceleration are demonstrated.
New Turbocharger Concept for Boosted Gasoline Engines
Honeywell has designed an innovative turbo system for gasoline engines featuring a new aerodynamic configuration. The new system, which does not use expensive materials such as TiAl, has demonstrated a ≥ 25 percent improvement in torque transient performance at low engin e speeds. This technology enables increased levels of engine downsizing and down-speeding and thus allows further reductions in fuel consumption and CO2 emissions.
TwoStage for New Audi V6-TDI Bi-turbo
The first TwoStage serial boosting architecture for V6 diesel engines was recently developed by Honeywell. Its unique architecture combines a high pressure VNT™ turbo that maximizes low-end response with a low pressure turbo for enhanced transition and high-end output. This downsized engine, with its 30 percent displacement reduction, delivers up to 35 percent increased engine power and up to 10 percent improved fuel economy.
High Volume Production of Ball Bearing Turbochargers
Recent developments at Honeywell have introduced Ball Bearing technology to passenger car diesel. The new “low-friction” turbo, which runs on two rows of ceramic balls, has much lower mechanical losses and hence higher turbo efficiency. The result is an improvement in transient response of between 20-70 percent dependant oil temperature and 2 percent improvement in fuel economy in standard test cycles. The 3.0L V6 diesel application in Europe is an example of the true potential of ball bearing technology.
Down-speeding and Upgrading a Product Line for US’07 Tier 2 Bin 5, EU5/6
From 2006 to 2010, the GT20-25 VNT™ product range has undergone a series of advanced changes in order to meet the US’07 Tier 2 Bin 5, EU5 and EU6 requirements. Cutting-edge aerodynamics, upgraded variable geometry mechanism (3rd generation) and new bearing systems are among the critical developments that helped achieve significant improvements in cold start, driveability, reliability, fuel consumption and emission control.
Sequential Boosting Valve and Turbocharger System sets New Standard for Diesel V-Engines
The remarkable performance improvement of the V6 3.0L JLR engine is enabled by Honeywell TwoStage parallel boosting architecture. The system consists of two turbos working sequentially: the primary VNT™ turbo solely provides boost at low engine speeds while the second turbo (in conjunction with the primary turbo) delivers peak power at high engine speeds. In addition, a unique valve technology controls the transition between mono and twin-turbo modes. Multi-stage turbocharging appears as a key enabling technology delivering outstanding performance in terms of low-end torque, high-end power and transient response.
