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Shashikanth Suryanarayanan TR35
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Shashikanth Suryanarayanan TR35

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  • 1. Shashikanth Suryanarayanan Assistant Professor, Department of Mechanical Engineering IIT Bombay, Powai, Mumbai 400076 Founder & Director, SEDEMAC Mechatronics Pvt Ltd Separating Decision Making from Actuation Steer-by-Wire with Independent Steering EMS for petrol-powered small engines
  • 2. Steer-by-Wire (SBW)
    • SBW: No mech linkages between handwheel and roadwheels
    Traditional Steering Systems Steer-by-Wire
  • 3. Steer-by-Wire (SBW) with Independent Steering
    • “ Handwheel” system can be configured to provide steering feel of choice
    • “ Little finger” Steering Possible
    • Feel of a traditional steering system possible
    Roadwheels independently steered; Departure from Ackermann Geometry Spread-Eagle Position Knock-knee Position
  • 4. Aug 8, 2008 /18 A Scorpio Retrofitted with India’s First Steer-by-Wire System
    • For one of the tests, made to feel like a conventional vehicle
    • Roadwheel system retrofit
  • 5.
    • Rapidly tightening emission norms
    • Anything below 0.6-0.7 g/km difficult to meet w carburettors
    • Going Forward: Carburettors out, Fuel-injection in
    • Fuel-injection allows for accurate fuel metering
    Emission Regulations for Small Engines Year 2-wheeler (g/km) 3-wheeler (g/km) CO HC+NOx CO HC+NOx 1991 12-15 8-9 30 12 1996 4.5 3.6 6.75 5.4 2000 2 2 4 2 2005 1.5 1.5 2.25 2 2008/10 1 1 1.25 1.25
  • 6. Sep 12, 2007 /30 Typical Catalyst Conversion Efficacy Maintaining air-fuel ratio close to stoichiomety  Reduced CO, HC, NO x emissions Fuel-Injection and Accurate Fuel Metering Orchestration of fuel injection and sparking requires EMS EMS: Sensors + Actuators + Control unit (ECU) Design Drivers: High fuel economy, good drivability, low emissions
  • 7. IIT Bombay Small Engine EMS
    • What’s new? Minimal Sensing Architecture  Reduced costs
    • Made possible through exploitation of small engine physics
    • Protos of ECUs tested by 2-wheeler OEM on chassis dyno
      • 75% ↓ in engine-out HC as compared to carburettor
      • 10% ↓ in fuel consumption as compared to carburettor
      • First successful, “from-scratch” concept effort in India leading to demo of a high-performance fuel-injection ECU
    • Product realization by SEDEMAC -- venture-funded start-up
    Battery Fuel Injector To Spark Plug Electronic Control Unit (ECU) ‏ From Vehicle Sensors Fuel Pump

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