Petrol engine and diesel engine 1 Cycle Otto

Petrol engine and diesel engine 1. Cycle ( Otto and diesel) 2. comparison www. bookspar. com | Website for Students | VTU NOTES | QUESTION PAPERS 1

Otto cycle ( theoretical) • • Suction stroke Compression stroke Working stroke Exhaust stroke www. bookspar. com | Website for Students | VTU NOTES | QUESTION PAPERS 2

Suction stroke • Stroke is represented by the line horizontal line AB. www. bookspar. com | Website for Students | VTU NOTES | QUESTION PAPERS 3

Compression stroke • Reversible adiabatic • Represented by curve BC. • Constant volume combustion process represented by vertical line CD. www. bookspar. com | Website for Students | VTU NOTES | QUESTION PAPERS 4

Working stroke • Process is represented by the line DE. (reversible adiabatic process) • Exhaust opens and drop in pressure is represented by EB. www. bookspar. com | Website for Students | VTU NOTES | QUESTION PAPERS 5

Exhaust stroke • Process is represented by a horizontal line BA. www. bookspar. com | Website for Students | VTU NOTES | QUESTION PAPERS 6

Diesel cycle www. bookspar. com | Website for Students | VTU NOTES | QUESTION PAPERS 7

Suction stroke • This process is represented by the horizontal line AB. www. bookspar. com | Website for Students | VTU NOTES | QUESTION PAPERS 8

Compression stroke • Adiabatic process represented by the line BC. www. bookspar. com | Website for Students | VTU NOTES | QUESTION PAPERS 9

Power stroke • Constant pressure expansion due to combustion of fuel is represented by CD. • Expansion of burnt gases represented by the curve DE. www. bookspar. com | Website for Students | VTU NOTES | QUESTION PAPERS 10

Exhaust stroke • Exhaust port opens at end of previous stroke represented by curve EB. • Exhaust gases expelled out represented by the curve BA. www. bookspar. com | Website for Students | VTU NOTES | QUESTION PAPERS 11