Infiniti QX4 service since 1996 of release
1. Introduction
2. Maintenance instruction
3. Routine maintenance
4. Engine
5. Cooling and heating systems
6. Power supply systems and managements
6.1. Specifications
6.2. System of the consecutive distributed injection (SFI)
6.3. Sbrasyvaniye of pressure in a power supply system of petrol engines
6.4. Check of a condition and replacement of fuel lines and their shtutserny connections
6.5. Systems of electronic control - the general information
6.6. Control system of the VG33E engine. Diagnostics procedures
7. Start and charge systems
8. Transmission line
9. Brake system
10. Suspension bracket and steering
11. Body
12. Electric equipment
 












6-2-sistema-posledovatelnogo-raspredelennogo-vpryska-sfi.html

6.2. System of the consecutive distributed injection (SFI)


The scheme of an arrangement of components of a control system of consecutive injection (SFI) in an impellent compartment

In systems of consecutive injection each of 6 (by number of cylinders) fuel injectors works at the moment of the beginning of opening of the corresponding inlet valve. Thus, fuel is injected into cylinders according to order of operation of spark plugs.

During start of the engine and in case of refusals the system passes control systems (emergency operation) to a mode of simultaneous injection of fuel in all cylinders of the engine.

The main components of SFI system are:

  • The catalytic converter of the closed type, system of catching of fuel evaporations (EVAP) and a retsirkulyatsiya of the fulfilled gases (EGR).

By efficiency of functioning the system answers all with requirements of the international standards. The description of a principle of functioning responsible for fuel injection the engine of a part of system below is provided. Information on functioning of a subsystem of ignition — see. Control system of the VG33E engine. Diagnostics procedures.

Placed in a fuel tank pogruzhny the fuel pump provides supply of fuel under pressure to the fuel highway, on the way banishing it through the fuel filter established behind under the car. The pressure of supply of fuel is defined established on the throttle case by a pressure regulator. Excess of fuel on the returnable line goes back to a fuel tank.

The electric part of a control system consists of the electronic module of management (ECM) and the following information sensors (see an illustration the Scheme of an arrangement of components of a control system of consecutive injection (SFI) in an impellent compartment):

  • The sensor of situation (potentiometer) of a butterfly valve (TPS) informs ECM on the provision of a butterfly valve;
  • The sensor of temperature of cooling liquid (ECT) informs ECM on temperature of cooling liquid of the engine;
  • The sensor of temperature of soaked-up air (IAT) informs ECM on temperature of air soaked up in the inlet pipeline;
  • The lambda probe (models for Great Britain) informs ECM on concentration of the content in the fulfilled gases of molecules About 2;
  • The sensor of provision of a cranked shaft (CKP) informs ECM on turns of the engine and the provision of a cranked shaft;
  • The sensor of provision of a camshaft (CMP) informs ECM on situation and frequency of rotation of a final camshaft;
  • The sensor of a detonation (KS) informs ECM on emergence of signs of early ignition;
  • The sensor of measurement of weight of air (MAF) informs ECM on amount of the air arriving in the inlet pipeline;
  • The sensor of absolute pressure in the inlet pipeline (MAP) informs ECM on load of the engine, tracing depth of depression in the inlet pipeline;
  • The control unit of system of anti-blocking of brakes (ABS) informs ECM on speed of movement of the car;
  • The sensor switch of central air of air (at the corresponding complete set) notifies ECM on the fact of turning on of the conditioner.

All arriving information is processed by ECM which then gives out teams of management of ignition and opening of an injector of injection of fuel. Management of an injector occurs by change of width of an operating electric opening impulse that allows with the minimum delay to make correction of structure of an air and fuel mix at change of external factors. Thanks to possibility of such adjustments return of the engine is supported at a maximum level at any stage of functioning of the unit: at start, during warming up, at acceleration, a deseleratsiya and movement with constant speed.

ECM exercises also administration of idling turns. Necessary adjustments are made by activation of the throttle of the step-by-step electric motor established on the case. The engine on the ECM teams makes an opening / perekryvaniye of the perepuskny channel, in case of need (for example, at closed or being in the provision of idling to a butterfly valve) starting up air bypassing the throttle chamber.

Besides, ECM exercises administration of functioning of system of catching of fuel evaporations of EVAP.

If from sensors information testifying to emergence not to an emergency situation arrives, ECM is switched in emergency functioning when instead of inadequate signals base values of the corresponding parameters are substituted — efficiency of return of the engine in such mode, naturally, decreases. About ECM entrance in emergency operation of the driver prevents operation of a control lamp of refusals on an instrument guard of the car (see. Head the Maintenance instruction), in memory of the processor is thus brought the corresponding diagnostic code (see. Control system of the VG33E engine. Diagnostics procedures).

At operation of a control lamp the car should be driven away at the first possibility on firm car repair shop Opel for carrying out detailed diagnostics with use of the special equipment and performance of necessary regenerative repair.

The diagnostic equipment (the input reader of skanerny type) is connected to located under a decorative slip under ahead lever of the parking brake to the DLC socket.


«on page back
6.1. Specifications
on the following page»
6.3. Sbrasyvaniye of pressure in a power supply system of petrol engines