The principle of operation of the fuel injection system
The fuel pump takes fuel from the fuel tank and delivers it to the accumulator in order to maintain the fuel pressure in the system within the range of 1.5-2.4 kg / cm2. Fuel through the filter is supplied under pressure to the fuel dispenser.
The pressure disk of the air mass meter fixed on the movable lever, which is installed between the air filter and the throttle valve, deviates depending on the air pressure 8 in the engine. The displacement of the pressure disk of the air flow meter is transmitted to the distribution plunger of the fuel dispenser-distributor, thereby determining the amount of fuel supplied. The fuel quantity distributor, depending on the position of the pressure plate of the air flow meter, supplies the required amount of fuel to the engine cylinders through the injectors, ensuring the optimal composition of the fuel-air mixture. The fuel dispenser and air flow meter form a mixture regulator.
Pilot pressure regulator (or the regulator of the composition of the working mixture when the engine warms up) reduces pressure on the control plunger during engine warm-up. Reducing the control pressure at the same air flow leads to an increase in the fuel supply and, consequently, to an enrichment of the combustible mixture.
The additional air supply valve, installed in the air duct, made parallel to the throttle valve, brings additional air to the engine during engine start-up and warm-up, which leads to an increase in the engine idle speed.
To facilitate starting a cold engine, an electromagnetic starting nozzle is provided, the opening time of which is regulated depending on the temperature of the coolant by a thermal time switch.
Adjustment Data
Fuel pressure in the system, kg/cm2: 4.5—5.2.
Control pressure on a warm engine or at idle, kg / cm2: 3.4-3.8.
Pilot pressure on a cold engine: see chart.
Residual fuel pressure in the system after 20 minutes after stopping the engine, kg/cm2, not less than: 1.5.
Idle mode, rpm: 850-950.
The content in the exhaust gases of carbon monoxide (SO), %: 1,0—2,0.
Fuel storage
Brand and type: Bosch 0 438 170 021.
Air mass meter
Brand and type: Bosch 0 438 120 086.
Color index: yellow-violet.
Fuel dispenser
Brand and type: Bosch 0 438 100 028.
Color index: black-red.
Mixture regulator
Brand and type: Bosch 0 438 060 025.
Fuel pump
Electric multisection fuel pump.
Brand and type: Bosch 0 580 254 982.
Fuel supply pressure, kg/cm2: 5.
Pump productivity, l/h: 100.
Pump performance when tested on a car with a 1/2 filled fuel tank for 30 s, cm3: 750.
Operating voltage, V: 7-15.
Consumed current. And, no more: 4.7.
Injection nozzles
Brand and type: Bosch EP/LKE 6 0 437 502 006.
Injection start pressure, kg/cm2: 3.3.
Fuel spray cone angle: 35°.
Thermal time switch
Brand and type: Bosch 0 280 130 220.
Rated voltage. AT 12.
Contact opening temperature,°C: +35.
Pilot pressure regulator
Brand and type: Bosch 0 438 140 005.
Rated voltage, V: 12.
The maximum allowable voltage. IN 20.
Working voltage. B: 7-15.
Auxiliary air valve
Brand and type: Bosch 0 280 140 118.
Rated voltage, V: 12.
Operating voltage, V: 7-15.
Electromagnetic starting nozzle
Brand and type: Bosch 0 280 170 411.
Rated voltage, V: 12.
Working voltage. B: 7-5.
Power consumption, W: 37.
Fuel spray cone angle: 80°.
Working pressure, kg/cm2: 4.5.