Eaton TVS Supercharger

Eaton TVS Supercharger

Meeting Customer Wants and Needs (CWN’s)…..

QFDsperformed at customers revealed these CWNs

  • Higher pressure ratio capability than current 5thgeneration supercharger
  • Increased air flow capacity for same supercharger package size
  • Higher isentropic efficiency (reduced input power)
  • Wider operating range
  • Improved NVH characteristics
  • No internal compression to cause parasitic cruise losses

Technical Details

TVS Rotor Design

5th Gen Rotors

TVS
Rotors


 

TVS Housing Design

5thGeneration Housing
TVS Housing

TVS Inlet Design

Improved airflow handling characteristics

  • Larger inlet port –lower air velocity
    • Driven by higher face to face twist

TVS Backflow Port Design

Backflow for noise control achieved through “Blowhole”.

“Blowhole” is internal leak for rotor cavity equalization.

TVS Front Inlet Design

 

Performance Data

R1900 TVS Supercharger
Volumetric efficiency 1.4 pressure ratio

R1900 TVS Supercharger
Volumetric efficiency 1.8 pressure ratio

R1900 TVS Supercharger
Thermal efficiency 1.4 pressure ratio

R1900 TVS Supercharger
Thermal efficiency 1.8 pressure ratio

R1900 TVSMap
Volumetric efficiency map

R1900 TVS Map
Isentropic efficiency map

S2300 Screw Compressor Map
Volumetric efficiency map

S2300 Screw Compressor Map
Isentropic efficiency map

60% Efficiency comparison

70% Efficiency comparison

R1900 TVS Supercharger
Mechanical Boosting Device Flow Comparison

TVS Supercharger
Family Table

Supercharger Power Consumption
Roots vs Screw

TVS Roots vs. Screw Compressor

  • TVS Roots has no internal compression resulting in lower parasitic losses.
    • Screw has 100% higher parasitic power consumption than Roots at highway cruising conditions\
    • Screw requires added complexity and cost of clutch to address parasitic
  • TVS Roots has higher airflow capability for given displacement/size
    • Wider operating range due to higher speed capability
    • Large efficiency islands allow better matching across all enginespeeds
  • For equivalent production volumes, cost of screw compressor is approx 25% to 30% more than a Roots type supercharger
    • Cost increase driven by component complexity of male/female rotors, different size drive and driven gears plus modulating clutch components
    • Currently available clutches have NVH and driveability concerns that require addressing

5.0L Engine
Performance Prediction

5.0L
Predicted Engine Power

5.0L
Predicted Engine Torque

5.0L
Predicted SC Pressure Ratio

5.0L
Predicted SC Input Power

5thGen vs. TVS NVH Analysis
Eaton Test Stand

NVH Evaluation –M112 VS. R1860

TVS prototype test results show improved NVH from current production M1125

Overall SPL, 5 MicrophoneAvg
R1860 prototypevsM112 & M122

Conclusions of NVH Evaluation

  • Very significant TVS improvements over 5thgeneration configurations
    • 5-10 dB LESS case radiated noise
    • TVS Prototype exhibits similar 5-MicSPL (dBA) with and without boost
    • TVS Prototype unit exhibits lower broadband noise than 5thgen roots.
    • Inlet and Outlet Dynamic Pressure responses generally more treatable than 5thgeneration

5thGen vs. TVS NVH Analysis
Eaton GM Truck

Testing

Inlet Microphone Overlay

Hood Microphone Overlay

Cabin Microphone Overlay

NVH Conclusions

  • Inlet Noise:
    • TVS has lower overall, supercharger fundamental, and supercharger harmonic content below 8kscrpm
  • Hood Noise:
    • TVS has lower overall, supercharger fundamental, and supercharger harmonic across most of the engine speed range
  • Cabin Noise:
    • TVS has lower supercharger fundamental across most of the engine speed range

TVS Supercharger Summary

  • 2.4 pressure ratio capability, 70%+ isentropic efficiency, and increased speed operating range.
    • Enables additional engine downsizing, improved packaging and higher specific engine outputs.
    • High compressor efficiency results in reduced SC power consumption for improved BSFC
      • Potential intercooler removal or increased compression ratio on lower specific output applications
    • Instantaneous boost response and high low speed torque capability enables final drive ratio optimization for improved fuel economy or vehicle performance.
  • Lower system costs possible with TVS supercharger
    • Improved NVH characteristics drive lower noise treatment costs.

With the Eaton TVS Supercharger, Customers can now get high efficiency andinstant boost response!

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