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ENAE202

Farm Power and Engine System

Syllabus

  1. Introduction to Farm Power (2 hours)
    1. Role of farm power in agricultural mechanization
    2. Survey of farm power
    3. Agricultural mechanization and labor requirement
  2. Animate and Inanimate Sources of Farm Power (4 hours)
    1. Sources of farm power and their utilization: human power, animal power, electrical power, mechanical power, solar energy, wind energy, bio-gas and micro-hydro
    2. Availability, advantages and limitations of farm power sources
    3. Account of farm power sources in Nepal
    4. Animal power harnesses: measurement of human and animal power; yokes and harnesses for draught animals; walking type farm machines and equipment; riding type farm machines and equipment; transport equipment; design parameters for animal harnesses
  3. Internal Combustion (IC) Engines (6 hours)
    1. Introduction to IC engine
    2. Operational parameters of IC engines
    3. Classification of IC engines
    4. Working cycles of IC engines
    5. Two-stroke and four-stroke cycle engines
    6. Spark ignition and compression ignition engines
    7. Engine components and their construction
    8. Firing order, firing interval and criteria for selection of firing order
  4. Performance of IC Engines (7 hours)
    1. Power and its measurements: concept of horse power; relation between mechanical and electrical power units; purpose and types of dynamometer; indicated power, brake power, mean effective pressure; engine efficiency; heat balance for IC engine; power, torque and speed relationship; specific fuel consumption
  5. Operating Principle and Function of Engine Systems (24 hours)
    1. Valve operating system: valve arrangement; components involved in valve operation; cam profile and valve lift; valve timing and valve clearance; valve adjustment and maintenance
    2. Intake and exhaust system: components involved; air cleaning system and types; performance of different air cleaners; maintenance
    3. Engine fuels and fuel supply system: properties of fuels; calorific and heating values; octane and cetane number; test of gasoline and diesel fuel; combustion equation for hydrocarbon fuels; combustion in spark ignition and compression ignition engines; air-fuel ratio and mixture requirements; carburetion and working principle of carburetor; diesel fuel supply system; petrol fuel supply system; petrol injection, electronic fuel injection (EFI) and multipoint fuel injection (MPFI) systems; common rail direct injection (CRDI) system; turbo charging and supercharging; governor and governor control
    4. Ignition system: purpose and types; components and function; pre-ignition and ignition delays; ignition timing, advance and retard; detonation and knocking in IC engine
    5. Cooling system: purpose and types; air cooling system; pressure water cooling system; corrosion and corrosion inhibitors; antifreeze mixture; cooling system tune-up
    6. Lubrication system: purpose and types; lubricating oil classification; properties of lubricants; additives and pollution; selection parameters; components of pressure feed lubrication system; maintenance
    7. Starting and electrical system: self-starting system; storage battery and its maintenance; charging, lighting and horn system; maintenance of electrical system
  6. Small Engines for Farm Operations (2 hours)
    1. Stationary engines for farm operations
    2. Range and availability in the country
    3. Selection of engines for farm operations

Practicals

Tutorial (15 hours)

  1. Estimate of human and animal power for operation of farm implements
  2. Preparation of power overlap chart
  3. Estimation of power of engine and its performances
  4. Preparation of heat balance sheet
  5. Calculation of heating value of hydrocarbon fuels

Practical (30 hours)

  1. Dismantling of an IC engine, identification of major parts and measurement of basic dimensions
  2. Study on working principle of two-stroke and four stroke cycle spark ignition and compression ignition engines, firing interval, firing order and valve timing
  3. Study on intake and exhaust system and air-cleaners
  4. Study on fuel supply system of compression ignition engines
  5. Study on fuel supply system of spark ignition engines
  6. Study on cooling system in IC engines
  7. Study on lubrication system in IC engines
  8. Study on governors and governing system in IC engines
  9. Study on electrical and starting system
  10. Oil and fuel test
  11. Starting of engine and making adjustments in engine systems
  12. Study on engine maintenance schedule, troubles and their remedies