9.1.6. Management of fuel system
Fig. 9.1. Control system of the Fenix 5.1 engine: 2/14 — the system relay of the engine; 3/1 — the ignition switch; 4/1 — the block of system management of the Fenix 5.1 engine; 6/13 — the fuel pump; 7/15 — the heated sensor of oxygen (HO2S); 7/21 — the RPM meter (RPM) of the petrol engine;
7/22 — the sensor of absolute pressure in a collector (MAR sensor); 7/23 — the sensor of temperature of cooling liquid of the engine (EST); 7/24 — the sensor of temperature of entrance air; 7/25 — the sensor of provision of a butterfly valve; 7/26 — the sensor of a detonation (KS); 7/27 — the sensor of position of the camshaft; 8/2 — the regulator of idling (IAC); 8/6, 8/7, 8/8, 8/9 — nozzles; 8/12 — the valve of a purge of the coal filter (SR); 10/51 — a precautionary lamp of temperature of exhaust gases; 11/2 — the block of safety locks in passenger salon; 24/20 — the 22-contact socket of a plait of passenger salon (C), a plait of a compartment of the engine (A) (gray); 24/23 — the 22-contact socket of a plait of passenger salon; 24/27 — the 12-contact socket of a plait of a compartment of the engine
(A) — a plait of the module of engine management (ESM); 24/33 — the 4-contact socket of a plait of the module of engine management (unified social tax) (B) (Q); 31/25 — a ground contact under the dashboard
BU provides operation of the main relay of system 2/14 (fig. 9.1)
, the fuel pump 6/13 and nozzles 8/6,8/7, 8/8, 8/9, receiving signals from the following sensors:
— sensor of frequency of rotation and provision of a bent shaft of the engine 7/21;
— sensor of position of the camshaft 7/27;
— sensor of pressure 7/22;
— sensor of air temperature 7/24;
— sensor of temperature of cooling liquid of the engine 7/23;
— sensor of provision of a butterfly valve 7/25;
— oxygen sensor 7/15.
BU provides operation of the main relay of system at inclusion of ignition. At the same time the fuel pump approximately on 1 turns on with; this time is enough for creation of necessary pressure of fuel. At an engine provorachivaniye a starter sensors of frequency of rotation and the provision of a bent shaft of the engine and position of the camshaft give the corresponding signals in BU which ensures functioning of the fuel pump and opening of nozzles for injection of fuel at the moment when the sensor of frequency of rotation and the provision of a bent shaft of the engine specifies stay in VMT.
During start-up of BU counts injection duration on the basis of data on engine temperature, pressure of air and frequency of rotation of the engine.
After launch of the engine duration of injection is calculated on the basis of the data on the frequency of rotation of the engine, tension of the rechargeable battery, temperature of the engine and its loading received as a result of pressure assessment in the inlet pipeline, air temperatures and opening of a butterfly valve. BU at the same time establishes consecutive injection once for a running cycle when the corresponding nozzle is open.
When calculating amount of injectable fuel also the amendment on a signal from the oxygen sensor after achievement of working temperature by it is provided.
Programs of compensation of change of tension of the rechargeable battery, acceleration, full loading and interruption in supply of fuel are provided in BU during braking by the engine, along with existence of the adaptive functions using information on optimum amount of injectable fuel for various traffic conditions.
Blok uses this information for introduction of compensation amendments and admissions on wear of components of system that allows to reduce emission of toxic gases to a minimum and to reduce time spent for work on service and adjustment. If the detonation exceeds extreme value, the amount of injectable fuel increases and process of combustion takes place more quietly. For prevention of damage of the engine the injection of fuel stops if the frequency of rotation exceeds some admissible value.
At turning on of the compressor of the conditioner of air or inclusion of transfer of BU at once increases amount of injectable fuel to compensate increase in loading and thus to provide the invariable frequency of rotation of idling.