Shashikanth Suryanarayanan Assistant Professor, Department of Mechanical Engineering IIT Bombay, Powai, Mumbai 400076 Foun...
Steer-by-Wire (SBW) <ul><li>SBW: No mech linkages between handwheel and roadwheels </li></ul>Traditional Steering Systems ...
Steer-by-Wire (SBW) with Independent Steering <ul><li>“ Handwheel” system can be configured to provide steering feel of ch...
Aug 8, 2008 /18  A Scorpio Retrofitted with  India’s First Steer-by-Wire System <ul><li>For one of the tests, made to feel...
<ul><li>Rapidly tightening emission norms </li></ul><ul><li>Anything below 0.6-0.7 g/km difficult to meet w carburettors <...
Sep 12, 2007 /30 Typical Catalyst Conversion Efficacy Maintaining air-fuel ratio close to stoichiomety   Reduced CO, HC, ...
IIT Bombay Small Engine EMS <ul><li>What’s new? Minimal Sensing Architecture    Reduced costs </li></ul><ul><li>Made poss...
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Shashikanth Suryanarayanan TR35

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Shashikanth Suryanarayanan TR35

  1. 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. 2. Steer-by-Wire (SBW) <ul><li>SBW: No mech linkages between handwheel and roadwheels </li></ul>Traditional Steering Systems Steer-by-Wire
  3. 3. Steer-by-Wire (SBW) with Independent Steering <ul><li>“ Handwheel” system can be configured to provide steering feel of choice </li></ul><ul><li>“ Little finger” Steering Possible </li></ul><ul><li>Feel of a traditional steering system possible </li></ul>Roadwheels independently steered; Departure from Ackermann Geometry Spread-Eagle Position Knock-knee Position
  4. 4. Aug 8, 2008 /18 A Scorpio Retrofitted with India’s First Steer-by-Wire System <ul><li>For one of the tests, made to feel like a conventional vehicle </li></ul><ul><li>Roadwheel system retrofit </li></ul>
  5. 5. <ul><li>Rapidly tightening emission norms </li></ul><ul><li>Anything below 0.6-0.7 g/km difficult to meet w carburettors </li></ul><ul><li>Going Forward: Carburettors out, Fuel-injection in </li></ul><ul><li>Fuel-injection allows for accurate fuel metering </li></ul>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. 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. 7. IIT Bombay Small Engine EMS <ul><li>What’s new? Minimal Sensing Architecture  Reduced costs </li></ul><ul><li>Made possible through exploitation of small engine physics </li></ul><ul><li>Protos of ECUs tested by 2-wheeler OEM on chassis dyno </li></ul><ul><ul><li>75% ↓ in engine-out HC as compared to carburettor </li></ul></ul><ul><ul><li>10% ↓ in fuel consumption as compared to carburettor </li></ul></ul><ul><ul><li>First successful, “from-scratch” concept effort in India leading to demo of a high-performance fuel-injection ECU </li></ul></ul><ul><li>Product realization by SEDEMAC -- venture-funded start-up </li></ul>Battery Fuel Injector To Spark Plug Electronic Control Unit (ECU) ‏ From Vehicle Sensors Fuel Pump

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