4.26. The power supply system

The power supply system structure includes elements of following systems:

Fig. 4.17. System топливоподачи: 1 – an arm of fastening of hoses; 2 – an electrogasoline pump; 3 – a bulk pipe; 4 – a fuel tank; 5 – a taking away tube of a fuel stage; 6 – a bringing tube of a fuel stage; 7 – an atomizer; 8 – a fuel stage; 9 – a regulator of pressure of fuel; 10 – an arm of fastening of the fuel filter; 11 – the fuel filter; 12 – fuel hoses; 13 – fuel tubes

– The system of giving of fuel including a fuel tank 4 (fig. 4.17), an electrogasoline pump 2, pipelines 5, 6 and 13, hoses 12, a fuel stage 8 with atomizers 7 and a regulator of pressure of fuel 9, and also the fuel filter 11;

Fig. 4.18. An arrangement of elements of the power supply system in подкапотном space: 1 – the air filter; 2 – воздухоподающий a branch pipe; 3 – throttle knot; 4 – an adsorber of system of catching of steams of fuel; 5 – the fuel filter; 6 – топливопроводы; 7 – a regulator of pressure of fuel; 8 – a fuel stage with atomizers

– Systems воздухоподачи, including the air filter 1 (fig. 4.18), воздухоподающий a branch pipe 2, throttle knot 3;

– Systems of catching of steams of the fuel, including an adsorber 4 and connecting pipelines.

Basic feature of the power supply system of the engine VAZ-2123 is absence in it of the carburettor combining functions смесеобразования and dispensing of giving топливовоздушной of a mix in cylinders of the engine. In the system of the distributed injection established on the given engine, these functions are divided – atomizers carry out the dosed out injection of fuel in an inlet pipe, and giving necessary during each moment of work of the engine of air is carried out by the system consisting of throttle knot and a regulator of idling.

Management of system of injection of fuel and ignition system is carried out by the electronic block of engine management continuously supervising by means of corresponding gauges size of loading of the engine, speed of movement of the car, a thermal condition of the engine, an optimality of process of combustion in engine cylinders. Such way of management gives the chance to provide optimum structure of a gas mixture during each concrete moment of work of the engine that allows to receive the maximum capacity at is minimum possible expense of fuel and low toxicity of the fulfilled gases. The power supply system represents an indissoluble part of a control system of the engine (more in detail the control system is described in section 9 "Electric equipment").

The fuel tank 4 - (fig. 4.17 see) welded, stamped, is fixed in a luggage space by bolts and nuts. In the top part of a fuel tank the electric fuel pump united with the gauge of level of fuel is established. From the pump fuel moves in the fuel filter established in a motor compartment, and therefrom arrives in the fuel stage of the engine fixed on an inlet pipe of the engine. From a fuel stage fuel is injected by atomizers into an inlet pipe. Surpluses of fuel through a regulator of pressure of the fuel, established on the back end of a fuel stage, merge in a fuel tank.

The fuel pump 2 – with the electric drive, two-level, роторного type, is established in a fuel tank that reduces possibility of formation of steam stoppers as fuel moves under pressure, instead of under the influence of depression. It provides giving of fuel under the pressure of more 284 кПа. The fuel filter 11 is built in submitting highway between an electrogasoline pump and a fuel stage and established in a motor compartment on a board передка bodies. The filter – not folding, has the steel case with a paper filtering element. The stage of 8 atomizers represents a hollow lath with the atomizers established on it and a regulator of pressure of fuel. The stage of atomizers is fixed on an inlet pipe. On the back end of a stage there is a valve for the control of pressure of the fuel, the closed carving stopper.

Atomizers 7 -

Are attached to a stage from which to them fuel moves, and the sprays enter into apertures of an inlet pipe. In apertures of a stage and an inlet pipe of an atomizer are condensed by rubber sealing rings. The atomizer represents the electromechanical valve in which the needle запорного the valve is pressed to a saddle by a spring. At giving of an electric impulse from the management block on a winding of an electromagnet the needle rises and opens a spray aperture, through which fuel moves in an inlet pipe of the engine. The quantity of fuel injected by an atomizer, depends on duration of an electric impulse.

The regulator of 9 pressure of fuel - is established on a fuel stage and intended for maintenance of constant pressure difference between pressure of air in an inlet pipe and pressure of fuel in a stage.

Fig. 4.19. A regulator of pressure of fuel: 1 – the case; 2 – a cover; 3 – a branch pipe for a vacuum hose; 4 – a diaphragm; 5 – the valve; And – a fuel cavity; – a vacuum cavity

The regulator consists of the valve 5 (fig. 4.19) with a diaphragm 4, drawn in by a spring to a saddle in the regulator case. On the working engine the regulator supports pressure in a stage of atomizers within 284–325 кПа.

On a regulator diaphragm pressure of fuel, and with another – pressure (depression) in an inlet pipe on the one hand operates. At pressure reduction in an inlet pipe (throttle заслонка it is closed) the regulator valve opens at smaller pressure of fuel, перепуская superfluous fuel on a drain highway back in a tank.

Pressure of fuel in a stage goes down. At pressure increase in an inlet pipe (at opening throttle заслонки) the regulator valve opens already at большем pressure of fuel and pressure of fuel in a stage raises.

The air filter 1 - (fig. 4.18 see) is established in a forward part of a motor compartment on rubber support. A filtering element – paper, flat, with the big area of a filtering surface. The filter is connected to throttle knot goffered воздухоподающим a branch pipe, two-piece. Between a branch pipe and the filter the gauge of the mass expense of air («the Control system of the engine» more in detail see) is established.

Fig. 4.20. Throttle knot: 1 – a branch pipe of a supply of a cooling liquid; 2 – a branch pipe of system of ventilation crankcase idling; 3 – a branch pipe For tap of a cooling liquid; 4 – the gauge of position throttle заслонки; 5 – an idling regulator; 6 – the union for an adsorber purge

The throttle knot 3 - (fig. 4.18) is fixed on a receiver. It doses out quantity of air arriving in an inlet pipe. Air receipt in the engine operates throttle заслонка, connected to a drive of a pedal of an accelerator. Into structure of a throttle branch pipe enter the gauge 4 (fig. 4.20) positions throttle заслонки and a regulator 5 idlings. In a flowing part of a throttle branch pipe (before throttle заслонкой and behind it) there are apertures of selection the depression necessary for work of system of ventilation crankcase and an adsorber of system of catching of steams of gasoline.

5 - (fig. 4.20 see) regulates frequency of rotation of a cranked shaft on an idling mode, operating quantity of submitted air bypassing closed throttle заслонки. It consists of the bipolar step-by-step electric motor and connected with it конусного the valve. The valve is put forward or cleaned on controller signals. When the regulator needle is completely put forward (that corresponds 0 steps), the valve completely blocks air pass. When the needle is moved, the expense of air proportional to quantity of steps of a withdrawal of a needle from a saddle is provided.

So the adsorber of system of catching of steams of fuel is established in a motor compartment:

1 – an adsorber; 2 – the electromagnetic valve of a purge of an adsorber; 3 – connecting hoses.

In system of catching of steams of fuel the method of absorption of steams by a coal adsorber 4 (fig. 4.18 see) is applied. It is established in a motor compartment and connected by pipelines to a fuel tank and a throttle branch pipe. On an adsorber cover the electromagnetic valve of a purge of an adsorber by which on signals of the block of engine management system operating modes are switched is located. When the engine does not work, the electromagnetic valve is closed also steams of gasoline from a fuel tank on the pipeline go to an adsorber where they are absorbed by the granulated activated coal. At the working engine the adsorber is blown by air and steams are sucked away to throttle knot, and then in an inlet pipe for burning during working process.

The controller operates an adsorber purge, including the electromagnetic valve located on a cover of an adsorber. At giving on the valve of pressure it opens, letting off steam in an inlet pipe. The valve on a method of pulse-width modulation copes. The valve joins and switched off with frequency of 16 times in a second (16 Hz). The above air expense, the is more duration of impulses of inclusion of the valve. The controller includes the valve of a purge of an adsorber at performance of all following conditions:

– Temperature of a cooling liquid above 75 °С;

– Speed of the car exceeds 10 km/h. After inclusion of the valve the criterion of speed varies. The valve will be disconnected only at decrease in speed to 7 km/h;

– Opening throttle заслонки exceeds 4 %. This factor has further no value if it does not exceed 99 %. At full opening throttle заслонки the controller disconnects the valve of a purge of an adsorber.

Malfunctions of system of catching of steams of fuel involve instability of idling, the engine stop, the raised toxicity of the fulfilled gases and deterioration of rideable qualities of the car.

Following malfunctions of system are possible:

– Malfunction of the electromagnetic valve of a purge;

– Adsorber damage;

– Overflow of the adsorber typing more 60 г of fuel (weight of a new adsorber no more than 1,1 kg);

– Damages or wrong connection of hoses.

THE PREVENTION In the power supply system of the engine with injection of fuel pressure makes 30 МПа (3 kgs/sm2). Therefore it is forbidden to weaken connections топливопроводов in an operating time of the engine or right after its stop. For work on power supply system repair on just stopped engine it is necessary to lower preliminary pressure in the power supply system. Through 2–3 ч after a stop of the engine pressure in system falls practically to zero.

The key «on 10» (it is desirable face) is required to you.

To lower pressure in the power supply system it is possible in two ways.

1. At the first way in salon turn away a nut of a cover of the block of engine management and...	2.... Uncover.

3. Take an electrogasoline pump safety lock.

4. Start up the engine and allow to it to work before full development of fuel from топливопровода. After that the engine will decay.

5. Insert into place a safety lock.

For pressure decrease also it is possible to use the control valve established on the back end of a fuel stage and closed by a plastic cap. The valve has a design similar to a zolotnik of the gate of the tyre of a wheel.

6. Turn away a cap and, having pressed a zolotnik, merge surplus of fuel.

7. After that it is possible to separate топливопроводы.

THE PREVENTION Be cautious – fuel being under a high pressure will leave in the form of the sprayed torch.

Replacement of a filtering element of the air filter is regulated – through each 30 000 km of run. However its condition depends on car service conditions: on more dusty and polluted roads the element gets littered faster.

The screw-driver is required to you.

THE NOTE For convenience of work remove a decorative casing of the engine (Removal and installation of a decorative casing of the engine »see«) and disconnect колодку a plait of wires from the gauge of the mass expense of air.

1. Turn out four screws of fastening of a cover of the filter...	2.... Raise a cover and take out from it filtering element.