Renault Megane, Scenic

Since 1996 of release

Repair and car operation

The general description of system of injection of fuel

SYSTEM OF CENTRAL INJECTION SIEMENS-FENIX 3

Models 1.4 of l (engines E7J) are equipped by system of the central injection of fuel Siemens-Fenix 3 with the case of throttle Bosch. The system includes каталитический the converter and system of catching of steams of fuel.
The toplivopodkachivajushchy pump submits fuel from a tank to injectors, through the filter established in a back part of the car. Pressure of giving of fuel copes a regulator of pressure which is established in assemblage of the case of a throttle.
The system of an electric equipment of management consists of the electronic block of management (ECU), along with following gauges.
a) the Potentiometer throttle заслонки - gives to the electronic module of management the information on position throttle заслонки and degrees of its opening.
b) the Gauge of temperature of a cooling liquid - gives to the electronic module of management the information on engine temperature.
The Gauge of temperature of entrance air - gives to the electronic module of management the information on temperature of air passing through the case of a throttle.
d) the Ljambda-gauge - gives to the electronic module of management the information on the oxygen maintenance in the fulfilled gases.
e) the Microswitch (it is included in the step-by-step motor of adjustment of turns of idling) - gives to the electronic module of management the information on closing throttle заслонки (that is when the gas pedal is released).
f) the Gauge of speed/position коленвала - gives to the electronic module of management the information on turns of the engine and position коленвала.
g) the pressure Gauge in the steering hydraulic booster - gives to the electronic module of management the information on application of the pump of the steering hydraulic booster, the module increases idling turns.
h) the detonation Gauge - gives to the electronic module of management the information on engine loading, supervising pressure in the inlet pipeline.
f) the Valve recycling the pair - copes system recycling fuel steams.
All information resulted above is analyzed ECU which then corrects the moment of ignition and fuel giving in the engine. ECU operates work of injectors, changing duration of injection (the period during which the injector is opened) to enrich or impoverish a mix as required. ECU constantly corrects a mix proportion, providing the best work of the engine in various modes.
ECU regulates also turns of idling by means of the step-by-step motor established in the case of a throttle. The motor pusher rests against a cam on an axis throttle заслонки. When throttle заслонка it is closed (a gas pedal is not pressed), ECU uses the motor to change position throttle заслонки and, thus, to regulate idling turns.
ECU also operates work of systems recycling the fulfilled gases and catching of steams of fuel.
If one of gauges fails ECU makes active the block of the initial memory containing regulated values of all factors. In this case ECU ignores a wrong signal of the gauge and replaces its memory taken from the block in size. If ECU addresses in the block of initial memory, on the instrument panel the control lamp lights up and in memory ECU the corresponding code of malfunction remains.
If the control lamp has lighted up, as soon as possible address on HUNDRED Renault which will execute full diagnostics of a control system by the engine by means of a special electronic tester (XR25) which simply joins in a diagnostic socket (it is established on the block of safety locks on the instrument panel).
The switch отсечки fuel is built in system of injection of fuel. In case of failure the switch disconnects energy giving to the fuel pump, preventing thus fuel flood at rupture топливопроводов.
Semiconsecutive system of distributed injection Siemens-Fenix 5
Engines K7M are equipped by the semiconsecutive distributed system of injection of fuel with the case of throttle Pierburg. Basically this system is similar to system with the central injection, described in the previous paragraphs except that in the inlet pipeline there are four injectors (on one on the cylinder). All injectors eat from the general fuel highway equipped with a regulator of pressure of fuel.
In system of semiconsecutive injection injectors work in pairs (1 and 4, and then 2 and 3). For one turn of the engine fuel is injected into each cylinder once, that is during full 4-taktnogo a cycle fuel is injected into cylinders twice.
In system there is a valve recycling the fulfilled gases.
On models with automatic transmission, the information from gauges on transmission is sent to the electronic module of management for processing to define the most effective parametres for the engine.

CONSECUTIVE SYSTEM OF DISTRIBUTED INJECTION SIEMENS-FENIX 5

Engines F3R and F7R are equipped by the consecutive distributed system of injection with the case of throttle Solex (F3R) or Magneti Marelli (F7R). This system is most similar to system with the central injection, described earlier except that in it there are four injectors (on one on the cylinder), established directly in the inlet pipeline or in a head of the block of cylinders. All injectors eat from the general fuel highway in which also there is a regulator of pressure of fuel.
In system of consecutive injection injectors work separately. Combined the signal from gauges of position of a cam-shaft and speed/position коленвала is used by the electronic module of management for definition of turns of the engine, position коленвала and stages of work of the cylinder. And the information on turns of the engine and piston position rather ВМТ arrives from the gauge of speed/position коленвала; the information on that. Which of two pistons is in ВМТ on a compression course, arrives from the gauge of position of a cam-shaft. On the basis of this data the electronic module of management is capable to define the moment of the beginning of injection of fuel for each cylinder separately. Other information from additional gauges allows the electronic module of management to calculate time of an open condition of an injector depending on temperature, turns and engine loading.
On models with engine F7R the valve also is included in system recycling the fulfilled gases. The information on it see in the Part From this Chapter.
On models with engine F7R to provide a necessary stream of entrance air on low turns of the engine for reception of the sufficient rotary moment, and on high turns for reception of sufficient capacity, the two-line inlet pipeline is used. I.e. there are two separate, in parallel working, inlet air lines, operated заслонкой and the electromagnetic block. Depending on engine turns, one of two inlet air lines will be opened or closed, providing a demanded air stream in all operational modes.