5.18.1. Features of a design

Elements of the following subsystems are a part of a power supply system:

Fig. 5.19. Fuel supply system: 1 – tubes fuel (plastic); 2 – fuel filter; 3 – arm of fastening of the fuel filter; 4 – sealing ring of the fuel pump; 5 – fuel pump; 6 – remote ring; 7 – clamping ring of fastening of the fuel pump; 8 – hose of a bulk pipe; 9 – stopper of a bulk pipe of the fuel tank; 10 – facing of a mouth of a bulk pipe; 11 – collar; 12 – bulk pipe of the fuel tank; 13 – the airtaking-away hose; 14 – collar of fastening of the fuel tank; 15 – connector (quick-detachable socket); 16 – fuel tank; 17 – tubes fuel (metal); 18 – hose of toplivopodvodyashchiya; 19 – arm; 20 – nozzles; 21 – fuel stage

– the fuel supply system including the fuel tank 16 (fig. 5.19

Fig. 5.20. Fuel stage and nozzles: 1 – nozzle; 2 – fuel stage; 3 – sealing ring; 4 – nozzle clamp; 5 – an union cap for control of pressure of fuel
), the fuel pump 5 with the built-in regulator of pressure of fuel, fuel tubes 1 and 17, a hose 18, a fuel stage of 2 (fig. 5.20) with nozzles 1, and also the fuel filter 2 (see fig. 5.19);

Fig. 5.21. System of air supply: 1 – sensor of a mass consumption of air; 2 – sealing plug; 3 – air filter; 4 – throttle knot; 5 – inlet collector; 6 – regulator of idling or regulator of additional air; 7 – collars of fastening of hoses; 8 – thermostat; 9 – the bringing pipe of the pump of cooling liquid; 10 – hoses of heating of throttle knot; 11 – the airbringing sleeve; 12 – collars of fastening of the airbringing sleeve

– the system of air supply consisting of the air filter 3 (fig. 5.21) airbringing sleeves 11, a throttle hub 4;

Fig. 5.22. System of catching of vapors of fuel: 1 – steam line tube lobby; 2 – tube of an adsorber and valve of a purge; 3 – adapter; 4 – hoses; 5 – adsorber purge valve; 6 – collar; 7 – fuel discharge tube; 8 – separator arm; 9 – laying of the valve; 10 – the valve is gravitational; 11 – separator of vapors of fuel; 12 – steam line tube back; 13 – steam line tube average; 14 – steam line tube; 15 – adsorber

– the system of catching of vapors of fuel including an adsorber of 15 (fig. 5.22), the adsorber purge valve 5, a separator of 11 vapors of fuel, the gravitational valve 10, connecting steam lines 1, 2, 12, 13, 14 and hoses 4.
Functional purpose of a fuel supply system — ensuring giving of necessary amount of fuel in the engine on all operating modes. The engine is equipped with an electronic control system with the distributed fuel injection. In system of the distributed injection of fuel of function of a smeseobrazovaniye and dispensing of supply of fuel-air mix in cylinders of the engine are divided: nozzles make the dosed injection of fuel in an inlet pipe, and the amount of air, necessary at every moment of operation of the engine, moves the system consisting of throttle knot and the regulator of idling. Such way of management gives the chance to provide optimum composition of gas mixture at each concrete moment of operation of the engine that allows to receive the maximum power at minimum possible fuel consumption and low toxicity of the fulfilled gases. The electronic control unit (ECU) the engine which is continuously controlling by means of the corresponding sensors the engine loading size, speed of the movement of the car, a thermal condition of the engine, an optimality of process of combustion in engine cylinders operates system of injection of fuel and system of ignition.
Feature of system of injection of the VAZ-2170 Lada Priora car is synchronism of operation of nozzles according to gas distribution phases (the control unit of the engine obtains information from the phase sensor). The controller includes nozzles consistently, but not in pairs or at the same time, as in systems of asynchronous injection. Each nozzle joins through 720 ° turn of a bent shaft. However on the modes of start-up and on dynamic power setting the asynchronous method of supply of fuel without synchronization with rotation of a bent shaft is used.
The main sensor for system of injection of fuel is the sensor of concentration of oxygen in the fulfilled gases (lambda probe). It is established in a final collector of the engine and together with the control unit of the engine and nozzles forms a contour of management of composition of the fuel-air mix given to the engine. The control unit of the engine determines amount of not burned down oxygen in the fulfilled gases by sensor signals and respectively estimates an optimality of composition of the fuel-air mix coming to engine cylinders in each timepoint. Having recorded a structure deviation from optimum 1:14 (fuel: air), the catalytic converter of the fulfilled gases ensuring the most effective functioning, the control unit by means of nozzles changes composition of mix. As the sensor of concentration of oxygen is switched on in a chain of feedback of the control unit of the engine, the contour of management of composition of fuel-air mix is closed. Feature of a control system of the engine of the VAZ-2170 Lada Priora car is existence, besides the operating sensor, the second, diagnostic sensor of concentration of the oxygen established at the exit from converter. It determines efficiency of its work by composition of the gases which passed through converter.
The fuel tank 16 (see fig. 5.19) welded, stamped, is installed under a body floor in its back part and fixed by two steel collars 14. That vapors of fuel did not get to the atmosphere, the tank is connected through a separator of 11 vapors of fuel (see fig. 5.22) and the gravitational valve by 10 steam lines 12, 13, 14 and 1 to an adsorber 15. In a flange opening in the top part of a tank install the electric module of an electrogasoline pump (the fuel pump) 5 (see fig. 5.19), the pump uniting in itself actually, the sensor of the index of level of fuel and the regulator of pressure of fuel. In a back part of a tank the branch pipe for accession of a bulk pipe 12 is executed. From the pump fuel moves in the fuel filter 2 installed from below on the basis of a body and from there comes to the fuel stage 21 fixed on a head of the block of cylinders of the engine. From a fuel stage fuel is injected by nozzles 20 into inlet channels of a head of the block of cylinders, and the torch of fuel is directed to the inlet valve. Surplus of fuel via the fuel pressure regulator installed in the electrogasoline pump module merges in the fuel tank. Such scheme of installation of the regulator of pressure of fuel, besides an exception of the long pipeline of the return discharge, allows to prevent temperature increase of fuel in a tank, defiant excessive steam formation.
The fuel pump (the electrogasoline pump module) 5 (see fig. 5.19) submersible, vortex type, with the filter of rough purification of fuel. The pump provides supply of fuel and is installed in the fuel tank that reduces a possibility of formation of steam traffic jams as fuel moves under pressure, but not under the influence of depression. The fuel pump provides supply of fuel from the fuel tank via the main fuel filter in a stage of nozzles under pressure of more than 380 kPa.
The fuel filter 2 (see fig. 5.19) thin cleaning — full-line, is fixed in an arm 3 on the basis of a body near the fuel tank. The filter is non-demountable, it is supplied with the steel case with the paper filtering element.
The fuel stage 21 (see fig. 5.19), representing a hollow tubular detail, serves for supply of fuel to nozzles and is fixed on a head of the block of cylinders. On the engine the besslivny power supply system is applied, pressure in a stage is supported by the fuel pressure regulator installed in the electrogasoline pump module. Nozzles 20 are attached to a stage by clamps 4 (see fig. 5.20) through rubber sealing rings. For alignment of pressure in nozzles fuel moves in a middle part of a stage.
Nozzles the sprays enter the openings located over inlet channels of a head of the block of cylinders. In openings of a nozzle are condensed with rubber sealing rings. The nozzle is intended for the dosed injection of fuel in cylinders of the engine and represents the high-precision electromechanical valve in which the needle of the locking valve is pressed to a saddle by a spring. When giving an electric impulse from the control unit the needle rises by an electromagnet winding and opens a spray opening through which fuel moves in an inlet pipe of the engine. The amount of the fuel injected by a nozzle depends on duration of an electric impulse.
The regulator of pressure of fuel is installed in the module of the fuel pump and intended for maintenance of constant pressure of fuel in a fuel stage. The regulator is connected in the beginning of the giving highway at once after the fuel filter and represents perepuskny the valve with the spring having strictly calibrated effort.

The air filter 3 (see fig. 5.21) is installed in a forward part of a motor compartment on three rubber support. The filtering element paper, flat, with a big area of the filtering surface. The filter is connected by the rubber corrugated airbringing sleeve 11 to a throttle hub 4. Between a sleeve and the filter the sensor of 1 mass consumption of air is installed (see. "Electronic Control System of the Engine (ECSE)").

The throttle hub 4 (see fig. 5.21) is fixed on an inlet collector 5. It doses amount of the air coming to an inlet pipe. Intake of air in the engine the butterfly valve connected to the accelerator pedal drive operates.
Sensors 4 (fig. 5.23) of provision of a butterfly valve and the regulator 5 of idling are a part of throttle knot. In a flowing part of throttle knot (before a butterfly valve and behind it) there are depression selection openings necessary for work of systems of ventilation of a case and catching of vapors of fuel.
The idling regulator 5 (see fig. 5.23) regulates the frequency of rotation of a bent shaft on the idling mode, operating amount of the given air bypassing the closed butterfly valve. It consists of the bipolar step electric motor and the conical valve connected to it. The valve moves forward or cleans up on signals of the control unit of the engine.
When the needle of the regulator is put completely forward (that there correspond 0 steps), the valve completely blocks air pass. When the needle is moved, the air consumption proportional to quantity of steps of withdrawal of a needle from a saddle is provided.
Changing the size of opening and closing of the valve of the regulator, the control unit compensates the significant increase or reduction of amount of the given air caused by its suction through untight inlet system or, on the contrary, a contamination of the air filter.

The system of catching of vapors of fuel prevents leaving the system of food in the atmosphere of the vapors of fuel which are adversely influencing environment ecology.
In system the method of absorption of vapors by a coal adsorber 15 is applied (see fig. 5.22). It is installed in a motor compartment on panels of facing of a radiator and connected by steam lines to the separator of 11 vapors of fuel established in a niche of the left back wheel and to the adsorber purge valve 5 located in a motor compartment on a decorative casing of the engine. The electromagnetic valve of a purge of an adsorber on signals of the control unit of the engine is switched by system operating modes.
Fuel vapors from a tank are partially condensed in a separator 11, condensate merges back in a tank on a tube 7. The remained couples pass through the gravitational valve 10 installed in a separator on steam lines 12, 13, 14, 1 and get to an adsorber 15. The second union of an adsorber is connected by a hose to the adsorber purge valve 5, and the third — to the atmosphere. At the switched-off engine the third union is blocked by the built-in backpressure valve, in this case the adsorber is not reported with the atmosphere. At launch of the EBU engine begins to give the operating impulses on the electromagnetic valve. The electromagnetic valve opens, under the influence of discharge the backpressure valve in an adsorber also opens, at the expense of it air from the atmosphere and fuel vapors from a separator comes to an adsorber. At this time there is a sorbent purge: vapors of gasoline are taken away through hoses 4 and a throttle hub 4 (see fig. 5.21) in an inlet collector 5.
Malfunctions of system of catching of vapors of fuel involve instability of idling, an engine stop, the increased toxicity of the fulfilled gases and deterioration in road performance of the car.