Tech@Edu

FUEL PUMP “A fuel pump is a device which deliver the fuel inside the fuel atomizer or fuel injector.” The purpose of the fuel pump is to meter the correct quantity of fuel and deliver it at the correct time to the engine cylinder according to the varying load and speed requirements. Parts of Fuel Pump The Fuel pump consists of following parts. 1. Plunger 2. Barrel 3. Delivery Valve 4. Ports 5. Spring 6. Rack Construction of Fuel Pump Its consists of Plunger which is driven by the cam & tappet mechanism, Barrel in which plunger reciprocate, Delivery Valve which lift off its seat under the liquid fuel pressure & spring force. The fuel pump is connected to the fuel injector through the passage P. SP & Y are the spill & supply port respectively. Types of Fuel Pump Two general types of fuel pump are as follows: 1. Mechanical Fuel Pump 2. Electrical Fuel Pump 1.  Mechanical Fuel Pump The mechanical fuel pump is operated by an eccentric on the engine camshaft. It is mounted o

Fuel Supply System “The fuel system of an internal combustion Engine is intended to produce a combustible mixture, composed of the fuel stored in the fuel tank and atmospheric air, and then deliver both to the cylinders.” Fuel Injection for SI Engine In a S.I engine, a measured quantity of petrol or gas is already mixed with air in a calculated proportion before being sucked by engine. Then this combustible charge having right quantity of fuel-air is ignited at the appropriate time at the end of compression stroke in the engine with the help of a spark plug. Depending on the method of mixing petrol or gas in the air in right proportion as per the requirement of engine, the fuel supply system of S.I engine is conventionally is of two types. 1. Carburetion In the carburetion method, fuel stored in the fuel tank is supplied to carburetor by means of a simple diaphragm pump through a fuel filter. The job of pump is only to supply fuel from fuel tank to float chamber of carburetor. Sometime

Wheel & Tyre Assembly Wheel “The wheel assembly consists of the hub, disc or spokes, rim, tyre & tube.”  Wheels is the important part of the vehicle. The vehicle can’t move on the road without wheels. “The wheels are legs of the vehicle carry it to far off distance. The support of the whole weight of the vehicle & convert rotary motion into longitudinal one.” The wheel also resists side force created by turning also absorb the road shocks. Essential  Requirement of Wheel In an automobile essential requirement of wheels are as follows–  1. Strong enough to take the weight of vehicle.  2. Flexible to absorb the road shocks.  3. Perfectly balanced statically as well as dynamically.  4. Able to grip the road surface.  5. Mounted or remove easily.  6. Not too expensive.  7. Lightest possible so that the unsprang weight is least. Classification of Wheel The automobile wheels are generally three types:-  (i) Pressed steel disc wheels.  (ii) Wire wheels.  (iii) Light alloy cas

Anti Lock Braking System “Anti-lock Braking System also known as anti-skid braking system (ABS) is an automobile safety system which prevents the locking of wheels during braking and avoid uncontrolled skidding.”  The modern abs system allows steering during braking which gives more control over the vehicle in case of sudden braking. The main advantages of using ABS system in vehicle is that it provides better control over the vehicle and decreases stopping distance on dry and slippery surfaces. Components of ABS It has four main components  1. speed sensors  2. Valves  3. Pump  4. Controller  1. Speed Sensors-  It is used to calculate the acceleration and deceleration of the wheel. It consists of a toothed wheel and an electromagnetic coil or a magnet and a Hall Effect sensor to generate signal. When the wheel or differentials of the vehicle rotates, it induces magnetic field around the sensor. The fluctuation in this magnetic field generates voltage in the sensor. This voltage gen