2.2.1.2. Features of a sitema of power supply of the engine

The power supply system of the engine provides a fence, a filtration and the distributed air supply and fuels in cylinders of the engine and consists of a power supply system air and power supply systems fuel.

Engine power supply system air

Fig. 48. Scheme of a power supply system of the engine air: 1 – air filter; 2 – sensor of a mass consumption of air; 3 – throttle device; 4 – regulator of additional air (RAA); 5 – top case of a receiver; 6 – lower case of a receiver; 7 – final gas pipeline; 8 – sensor of provision of a butterfly valve; 9 – the adjustment screw WITH; 10 – air temperature sensor


The power supply system air functions as follows. Air in the engine is sucked in via the air filter 1 (fig. 48), the sensor 2 of a mass consumption of air and the single-channel throttle device 3 which size of opening depends on effort of pressing a pedal of the drive of a butterfly valve. In zadrosselny space air mass is divided by pipes of a receiver and condensed in engine cylinders due to effect of inertial pressurization. On the modes of start-up, warming up and idling of the engine air supply is carried out via the roundabout channel of the regulator 4 of additional air adjusted by the control unit executed bypassing a butterfly valve.
 Air filter. The input channel of the filter is intended for an air intake from podkapotny space. The output channel of the filter is connected by a rubber branch pipe to the sensor of a mass consumption of air.
 The throttle device is intended for regulation of mass of the air coming to engine cylinders. It fastens to the top case of a receiver of the engine and connects rubber branch pipes to the sensor of a mass consumption of air and the regulator of additional air.
The throttle device includes the following elements: the case with an oval opening through passage in which on an axis the air butterfly valve, the mechanism of the drive of a butterfly valve with the coulisse, the flowing channel of system of heating of the throttle device, the channel for ventilation of a case idling and the sensor 8 of provision of a butterfly valve is fixed.
The initial provision of a butterfly valve is regulated by means of the persistent screw that excludes jamming of the gate and normalizes air supply via normally closed throttle device.
Smooth opening of the gate in the initial sector of an angle of its turn in case of sharp pressing a pedal of a butterfly valve is provided due to operation of the kulisny mechanism. It increases comfort of a trip on the car.
The angle of rotation of the gate is traced by the sensor of provision of a butterfly valve which axis is rigidly connected with a gate axis. Information on the size of opening of a butterfly valve and speed of its closing or opening comes to the control unit of the engine.
 The receiver of the inlet gas pipeline is intended for distribution of air on cylinders of the engine and its consolidation.
The receiver consists of two parts: the top case 5 to which the throttle device and the regulator of additional air, and the lower case 6 fastens. Cases of a receiver have flanges which parts of a receiver fasten among themselves and to the block of cylinders. All connections of a receiver are condensed with laying.
Distribution of the sucked-in air on receiver pipes besides creation of effect of inertial pressurization allows to limit an overflowing of fuel-air mix from an inlet pipe of one cylinder in an inlet pipe of another. In the top case of a receiver the air temperature sensor 10 is screwed in.
 The regulator of additional air (the idling regulator) is intended for management of air supply bypassing a butterfly valve on various power setting.
The size of opening of the regulator is set by the operating control unit signals.
In the start-up mode when the throttle device is closed, the regulator of additional air opens completely until steady launch of the engine.
In the mode of warming up of the engine the regulator of idling is open more than for 50% and provides the increased idling rotation frequency which established value is defined by temperature of cooling liquid.
In the mode of restriction of the minimum frequency of rotation of idling the regulator is open less than for 50% and provides the first step of regulation of frequency of idling of the heated-up engine.
In the mode of compulsory idling (the braking mode the engine) the regulator is completely closed and opens for transition of the engine to the idling mode when rotation frequency at the closed butterfly valve becomes lower than minimum.
In the modes of partial loadings and full capacity the regulator is slightly opened for damping of fluctuations of air in the inlet highway that ensures steady functioning of the engine at sharp closing and opening of a butterfly valve.

Engine power supply system fuel

Fig. 49. Scheme of a power supply system of the engine fuel: 1 – fuel tanks; 2 – filter settler; 3 – electric fuel pump; 4 – jet pump; 5 – filter of thin purification of fuel; 6 – fuel stage; 7 – fuel pressure regulator; 8 – stopper of the fuel tank; 9 – valve; 10 – the giving fuel highway; 11 – drain highway


The engine power supply system fuel functions as follows. The intake of fuel is made by the working electrogasoline pump of 3 (fig. 49) from the left tank via the filter settler 2. Further fuel comes via the filter 5 of thin cleaning to a fuel stage 6, relative pressure in which is supported by pressure regulator 7 at the level,
300 kPa. Elevated pressure of fuel excludes emergence of vials of air and vapors of gasoline in a fuel-supply line which prevent normal work of nozzles. The nozzles representing high-speed electromagnetic valves (are normally closed), open and inject fuel into an inlet pipe of the engine.
Opening closing of nozzles is carried out automatically according to the cyclogram of work of the corresponding output channels of the control unit. Nozzles inject fuel on the hot closed inlet valves of cylinders of the engine that improves quality of fuel-air mix. The control unit establishes duration and a phase of injection of fuel depending on power setting, frequencies of rotation cranked
shaft and loading. Excess fuel in a stage merges through an opening of the regulator of pressure and the jet pump 4 in the left tank. At the same time fuel by means of injection flows from the right tank via the jet pump in the left tank.
 The fuel stage is intended for connection of the fuel highway to an inlet path of the engine and installation of nozzles.

Fig. 50. Fuel stage: 1 – a hose from the fuel filter of thin cleaning; 2 – fuel stage; 3 – nozzle; 4 – pressure regulator; 5 – a fuel discharge hose (to the jet pump)


The fuel stage of 2 (fig. 50) represents a through pipe with four openings for connection and fixing of entrance unions of nozzles 3. On the one hand pipes the giving fuel highway, with another – the drain fuel highway with the fuel 4 pressure regulator is connected.
Output unions of nozzles through sealing rings are pressed by a fuel stage to openings in a head of the block of cylinders.
 The regulator of pressure of DR-L 0280160258 fuel (BOSCH, Germany) or its analog is intended for maintenance of constant pressure difference of fuel about 300 kPa in a fuel stage and zadrosselny space of an inlet pipe.
The regulator of pressure consists of the following elements: cases with the pressure chamber, entrance and output fuel unions, the valve of management of the return discharge of the fuel fixed on a diaphragm and the vacuum chamber with the air union.
The regulator of pressure fastens via the entrance carving union to a drain opening of a fuel stage, and its output union connects via the drain pipeline to the jet pump. The air union of the regulator of pressure of fuel is connected by a thin rubber hose to the union screwed in a receiver of an inlet pipe.

Fig. 51. Jet pump


 The pump jet (fig. 51) is intended for compulsory pumping of fuel from the right tank in left.
The pump represents an injector which flowing channel is connected to the pipeline of discharge of fuel in the left tank, and the injection channel – to the right tank.
The jet pump is fixed on fuel hoses at the left longeron of a frame.
 Fuel tanks. The bulk mouth of the right tank has the union for connection of a hose to the tank valve. The valve is installed under a cowl at the left on an extension of a guard of facing of a radiator and allows to support fuel pressure in the right tank, close to atmospheric.
As fuel merges in the left tank, in case of creation in it excessive pressure excess fuel flows from the left tank in right. At operation it is necessary to watch that the stopper of the left tank was densely and without distortion it is closed.