6. Power supply systems and managements
Placed in a fuel tank electric погружной fuel наос functions under control of ECM and it is activated at giving from the module of a signal of grounding on the pump relay. An electric food is kept on the relay during till 5 seconds at inclusion of ignition and during all time проворачивания the engine by a starter.
The relay also remains запитанным during all time of delivery on ECM a signal «180 °» from the gauge of position of a camshaft (CMP).
The pump provides fuel giving under a pressure in a fuel highway. Pressure of fuel in injectors is supervised by the special regulator placed in a returnable line between a highway and fuel tank. The pressure regulator consists of two separate tight chambers (fuel and spring), divided among themselves a diaphragm. In the fuel chamber gasoline arrives through similar port from a fuel highway, in the spring chamber depression from the inlet pipeline moves. Such principle of management of a diaphragm allows to support pressure of fuel in a highway at the set level depending on current loading on the engine. So, on single turns depth of depression in the inlet pipeline is great enough that leads to a deflection of a diaphragm and tap back in a fuel tank большего quantities of fuel. Squeezing of a pedal of an accelerator leads to decrease in depth of depression in the pipeline, the effort thus developed by a spring leads to diaphragm displacement, перекрыванию to a returnable line and, as consequence, to increase in pressure of injection.
ECM defines duration of opening of valves of injectors on the basis of the analysis of the information arriving from gauges of position of a camshaft (CMP) and measurement of weight of air (MAF). The width developed ECM command impulses defines quality injected into chambers of combustion of an air-fuel mix.
So mix enrichment is made by the management module in following situations:
- At engine start;
- During engine warming up;
- At an acceleration;
- At work in a hot mode;
- At switching АТ from position «N» in position «D»;
- In modes of functioning with the raised loading.
Mix pauperisation is made:
- At деселерации (braking by the engine);
- At engine functioning on high turns.
The feedback organised through a ljambda-probe allows ECM to make thin updatings of quality of the air-fuel mix, allowing to achieve the maximum return from the engine at a minimum level of toxicity of products of combustion. Rupture of a chain of a feedback in a mode of constant functioning occurs to transition in following situations:
- During engine start;
- Till the moment of warming up of a ljambda-probe to normal working temperature;
- At movement with high speeds with the raised loading on the engine;
- At refusals in a ljambda-probe chain;
- In time деселерации;
- At engine overheats.
Fuel injectors represent the small electromagnetic valves possessing high level of controllability. Opening of valves occurs on given out ECM to the signals having the form of rectangular impulses and leads высоконапорному to fuel injection directly in chambers of combustion of the engine. The necessary pressure is provided with the fuel pump and supervised by a pressure regulator (see above).
Essential influence on the fuel expense renders style of driving. Some councils about reasonable use of a pedal of an accelerator on equipped with system of injection of fuel cars are more low resulted:
- In any weather (even in a frost) begin movement right after realisation of start of the engine;
- At a car stop for a while more for 40 seconds, suppress the engine;
- Try to move always on as much as possible high transfer;
- On distant trips try to support constant speed of movement. Avoid movement on excessively high speeds. Operate the car circumspectly, avoid causeless braking;
- Transport the car excessive cargo, in the absence of need remove from a roof the top luggage carrier;
- Regularly check pressure of a rating of tyres, — try not to suppose its excessive decrease.
Security measures and rules of observance of cleanliness at work with fuel system
The general rules
- Do not come nearer to a place of work with open fire or the lighted cigarette. Always keep in readiness the fire extinguisher.
- Fuel steams are poisonous, — watch maintenance of normal ventilation of a workplace.
- The fuel system is under pressure. At opening of system fuel can be pulled out from it under pressure, — before отпусканием choke sockets turn their rags. Use goggles.
- At work with components of the power supply system of the diesel engine observe special safety measures. In a special measure the given statement concerns procedures of service of atomizers. Remember that pressure of fuel upon an exit makes of atomizers about 1100 atmospheres, — do not substitute under a stream of a hand and other parts of a body.
- Collars of tape and tightening type are applied to fastening шланговых connections. After a detachment of hoses it is necessary to replace tightening collars tape or worm. Fixing of locks of some collars demands application of special adaptations, — consult with experts firm HUNDRED Opel.
- Before undocking choke sockets carefully wipe them outside in order to avoid hit of a dirt in a path.
- Removed components stack on a pure lining and turn in polyethylene or a paper, — avoid application for rubbing and оборачивания components ворсящейся rags.
- If repair demands time, track, that all open apertures in knots and power supply system components have been carefully muffled.
- Establish into place only pure details. Spare parts take out from packing only directly ahead of installation. Do not apply details which were stored unpacked (for example, in a tool box).
- Avoid application of compressed air at an open fuel path. Whenever possible try not to move the car.
- Do not apply some hermetics containing silicone. The particles which have got to the engine of silicone do not burn down and ljambda-probe damage can be at the bottom.
Security measures at removal of a fuel tank
- Before tank removal merge from it fuel or pump out its pump specially provided for this purpose.
- The fuel tank acts in film from the bottom party of the car. Before отпусканием assembly tapes, prop up a tank from below тележечным a jack, — lay between a tank and a jack head wooden брусок.
- The empty tank is explosive and before recycling should be cut on a part, — try not to admit at tank cutting искрообразования. Will hand over most correctly a tank in special place of acceptance.
- After tank installation start the engine and check up tightness of all connections.