Introduction about Engine auxiliary systems

1. ENGINE AUXILIARY SYSTEMS
UNIT-II

2. Simple Carburetor

3. Multiple jet compensation

4. SOLEX CARBURETOR
TYPES OF CIRCUITS
1. Float circuit
2. Starting circuit
3. Idle and slow running circuit
4. Normal running circuit
5. Acceleration circuit

6. Starting circuit

8. ELECTRONIC FUEL INJECTION SYSTEM
FOR SI ENGINE

9. GASOLINE INJECTION SYSTEM
1. Multi-point injection system
2. Monopoint injection system

12. Electronically Controlled Gasoline
Injection System
• Fuel delivery system
• Air induction system
• Sensors and air flow control system
• Electronic control unit

13. Sensors and air flow control system
1. Air flow sensor
2. Intake air temperature sensor
3. Exhaust gas oxygen (EGO) sensor
4. Manifold absolute pressure (MAP) sensor
5. Speed/crankshaft sensor
6. Engine temperature sensor
7. Crankshaft position sensor
8. Knock sensor

15. ELECTRONIC DIESEL INJECTION
SYSTEM
1. Unit injector system
2. Rotary Distributor system
3. Common rail direct injection system

16. UNIT INJECTOR SYSTEM

21. ELECTRONIC IGNITION SYSTEM

25. SUPERCHARGING
• Supercharging is the process of supplying the
air fuel mixture to the engine just above the
atmosphere pressure. A supercharger
increases the pressure of the air fuel mixture
from the carburetor before it enters the
engine.

26. TURBO CHARGERS

27. Variable Geometry Turbocharger

28. Variable Geometry Turbocharger

29. Waste Gate Turbocharger

30. EXHAUST GAS RECIRCULATION SYSTEM

31. Engine Emission Control by Catalytic
Converter
(platinum, rhodium, palladium)

32. (i) Reduction catalyst:
The reduction catalyst is the first stage of the
catalytic converter. It uses platinum and rhodium to help in
reducing NOx emissions. When an NO or NO2 molecule
contacts the catalyst, the catalyst rips the nitrogen atom out
of the molecule and holds on to it, freeing the oxygen in the
form of O2. The nitrogen atoms bond with other nitrogen
atoms which are also stuck to the catalyst, forming N2.
2NO => N2+ O2

33. (ii) .Oxidation catalyst:
The oxidation catalyst is the second stage of the
catalytic converter. It reduces the unburned hydrocarbons
and carbon monoxide by burning (oxidizing) them over a
platinum and palladium catalyst. This catalyst aids the
reaction of the CO and hydrocarbons with the remaining
oxygen in the exhaust gas.
2CO + O2 => 2CO2

34. EMISSION NORMS (EURO AND BS)
• Emission norms for automobiles are the standards set by the
authority of different countries focusing on controlling the
amount of pollutants released into the environment from
automobiles.
• Each stage of emission standards specifically describes the
amount of pollutants from vehicles such as carbon monoxide
(CO), nitrogen oxides (NOx), sulphur dioxide, carbon dioxide
(CO2), hydrocarbons (HC) and particulates which can be
emitted from an automobile into the environment. These
regulatory standards differ from bottom to nation. But the
aim is common to control the environmental pollution.

35. Parameters determining emission from vehicles:
• Vehicular technology
• Fuel quality
• Inspection & maintenance of in-use vehicles
• Road and traffic management.