6-6-sistema-upravleniya-dvigatelem-vg33e-procedury-diagnostiki.html

6.6. Control system of the VG33E engine. Diagnostics procedures

At the expense of use of the high-speed electronic computer (processor) the control system of the engine carries out coordination of such vital processes, as configuration of an air and fuel mix, installation and continuous adjustment of a corner of an advancing of ignition, functioning of systems of a retsirkulyatsiya of the fulfilled gases and stabilization of turns of idling and so forth. At the center an objective of receiving the maximum return from the engine in any road conditions at minimum fuel consumption and concentration of the maintenance of toxic components in the fulfilled gases.

Function chart of a control system of the VG33E engine

Design of the distributor of ignition

Location of the relay of ignition

Location of the relay of the fuel pump

The chart of gleams of a control lamp of MIL at delivery of diagnostic codes

The task put before system of increase of efficiency of return of the engine and ensuring the maximum comfort of movement is carried out by tracking and adjustment of the following parameters:

• Corner of an advancing of ignition and time of a perekryvaniye of inlet and final valves in relation to positions of pistons;
• Structure of the air and fuel mix submitted to chambers of combustion in each working step of pistons;
• The moment of ignition compressed in the cylinder at the end of a step of compression of an air and fuel mix;
• Temperature of combustion of gas mixture in cylinders, especially at operation of the engine under loading;
• Engine turns in any operating conditions.

All transferred parameters are supervised and corrected by an electronic control system of the engine, providing its maximum return at minimum fuel consumption and issue in the atmosphere of toxic products of combustion practically under any service conditions of the car.

Quality management of an air and fuel mix

For ensuring operation of the petrol engine on single turns in chambers of combustion the gas mixture enriched with fuel should move. At car movement with cruiser speed the quantity of an air component in a mix increases (pauperization). Increase of load of the engine, work of the last on high turns also is accompanied by enrichment of an air and fuel mix. Any changes of quality of a mix should be made smoothly, whenever possible, is imperceptible for the driver. The electronic control system of the Infiniti engine provides precision management of amount of fuel injected into the engine on the basis of arriving from the corresponding sensors of the analysis of information on amount of air soaked up in the engine, turns of a cranked shaft and the provision of a pedal of a gas / butterfly valve.

Measurement of a mass consumption of atmospheric air arriving in the engine is carried out built in to the inlet air highway of the sensor of measurement of weight of air (MAF). Sensors of this type are capable to trace the slightest changes of an expense and density of an air stream and possess very small lag effect, almost instantly correcting parameters of information signal given out on ECM. On the basis of the analysis of parameters of impulses of tension of ECM arriving from the MAF sensor develops command for the corresponding correction of amount of fuel injected into the engine by the thinnest corrections of duration of time of opening of needle valves of injectors. As the range of changes makes milliseconds, working parameters of the engine are corrected smoothly, without throws and failures of turns.

System of the consecutive distributed injection of fuel

On the Infiniti models considered in the real Management the distributed system of injection when each of chambers of combustion is equipped with the individual injector placed in inlet port is used. Injectors provide tonkodispersny dispersion of fuel, under the pressure of injected directly in a stream submitted to inlet port of the chamber of combustion of an air stream. As the moments of injection are coordinated with ignition order, it is a question of system of consecutive type. Injection of accurately dosed out amount of fuel is carried out directly ahead of the moment of opening of the inlet valve of each of cylinders.

Functioning of injectors is defined by supply of the fuel which pressure in a path of a power supply system is corrected depending on depth of depression in the inlet pipeline. Fuel submitted under pressure is pumped over via the filter of thin cleaning established in an impellent compartment and arrives to the fuel highway with the injectors built in in it. Thus, on an entrance of injectors superfluous pressure that guarantees uninterrupted operation of injection at any moment when opening needle valves is constantly supported.

At the expense of the redirection of excess of fuel back in a fuel tank the special regulator of pressure of fuel provides on an entrance of injectors constant superfluous over pressure in the inlet pipeline a pressure in size in 2.4 kgfs/cm ² (235 kPas).

Such scheme allows ECM to carry out adjustment of number of combustion of fuel injected into chambers by simple change of duration of time of opening of injectors — than more long needle valves of injectors remain open, especially the enriched mix moves in cylinders.

Management of a corner of an advancing of ignition

The greatest efficiency gives the chance dynamic management of ignition when the moment of ignition of an air and fuel mix is corrected depending on specific conditions of functioning of the engine. As operating parameters load of the engine, frequency of rotation of a cranked shaft, temperature of cooling liquid, atm