1997-2005 of release
Repair and car operation
+ Cars Subaru Forester
+ The maintenance instruction
+ Routine maintenance
+ The engine
+ Systems of cooling, heating
- The power supply system and release
System of release of the fulfilled gases - the general information
Measurement of pressure of fuel
Pressure dump in the power supply system
Principle of action and check of serviceability of functioning of the fuel pump
Service of the fuel filter
Check of a condition and replacement of fuel lines and them штуцерных connections
Service перекидного the valve
Removal and installation of the case of a throttle
Injectors of injection of fuel - the general information and service
Regulator of pressure of fuel - the general data
Cleaning and repair of a fuel tank - the general data
Removal and installation of the gauge of measurement of weight of air (MAF)
Check of serviceability of functioning of system of electronic injection
Turbo-supercharging system - the general information
Service of system of a turbo-supercharging
Release system - the general information
+ Engine electric equipment
+ Control systems of the engine
+ Gear change box
+ Coupling, трансмиссионная a line
+ Brake system
+ Suspension bracket and steering
+ Onboard electric equipment
Turbo-supercharging system - the general informationThe general information and functioning principle
The system consists from турбокомпрессора with water cooling, an intermediate cooler (Intercooler) and control systems of pressurisation (MPFI Turbo).
The scheme of functioning of system of a turbo-supercharging
The control system allows to force the engine on capacity that in an essential measure raises efficiency of its return and, as consequence, improves manoeuvrability of the car in all working ranges. In a control system function of indemnification of change of barometric pressure at car operation in high-mountainous district is provided.
Air, having passed an air cleaner, gets in турбокомпрессор, after compression in which, it is cooled in the heat exchanger of an intermediate cooler (Intercooler) then moves in the case of a throttle and further, - in the inlet pipeline and engine cylinders.
For демпфирования fast change of pressure at sharp closing throttle заслонки bypassing it it is provided special перепускной the channel. At sharp increase of depth of depression at closing заслонки air on the given channel arrives on a compressor input. Application to such system allows to lower appreciably level of a noise background during braking by the engine.
The control system of pressurisation (MPFI Turbo) consists of the gauge of pressure of air, the block of the management, the operating electromagnetic valve, a drive diaphragm перепускного the valve and actually the valve of dump of the pressure providing перепускание of gases by the turbine. The gauge of pressure of air supplies the block of management with the information on pressure in the inlet pipeline.
The compressor is equipped by own water shirt and перепускным the valve of dump of pressure. The turbine is made of a heat-resistant steel, the compressor case, - from an aluminium alloy. The turbine shaft is kept in bearings of floating type.
Adjustment of pressure of pressurisation
Appointment перепускного the valve of dump of pressure
With increase in frequency of rotation of a cranked shaft (at similar positions throttle заслонки) the expense of the fulfilled gases increases that, in turn, leads to growth of turns of a shaft of the turbine (approximately with 20 000 to 150 000 in a minute) and, accordingly, - pressure of pressurisation. Growth of pressure of pressurisation can lead to detonation combustion of an air-fuel mix (diesel engine-effect) and, as consequence, - to increase of thermal loading on the bottoms of pistons that is fraught with damage of internal components of the engine. For the purpose of liquidation of similar effect the compressor is equipped by the special valve of dump of the pressure providing перепускание of gases bypassing the turbine.
The scheme of functioning of the valve of dump of pressure
The concept of management of pressure of pressurisation
turbocharger receives oil from system of greasing of the engine. As soon as frequency of rotation of a shaft of the turbine reaches several thousand turns a minute, shaft bearings "emerge" on the oil wedge formed as with external, and from the inside подшипниковой of assemblage. Except greasing of bearings oil provides also additional heat removal from турбокомпрессора.
The greasing scheme турбокомпрессора
About the purpose of increase of service life and reliability of functioning турбокомпрессора in its case the water shirt of cooling is provided. The cooling liquid arrives on connecting hoses from a water shirt of the engine. After selection of heat from турбокомпрессора the working liquid goes to a broad tank of system of cooling.
System of intermediate cooling of air
The scheme of functioning of system of an intermediate cooler of system of a turbo-supercharging
Intermediate cooling of air after its exit from the compressor raises efficiency of functioning of system of a turbo-supercharging, reduces probability of occurrence of a detonation of a mix and promotes reduction of the expense of fuel.
The scheme of connection of the heat exchanger of an intermediate cooler of system of a turbo-supercharging
The intermediate cooler (Intercooler) represents the water-air heat exchanger with low hydraulic resistance and high cooling ability.
Design of the heat exchanger of an intermediate cooler (Intercooler) turbo-supercharging systems
The heat exchanger of an intermediate cooler consisting of five separate blocks, is executed from an aluminium alloy and provides tap of surplus of heat from the air stream which temperature rises as a result адиабатического compression in the compressor.
The scheme of connection of a radiator of an intermediate cooler of system of a turbo-supercharging
The radiator of an intermediate cooler is made from оребренных aluminium pipes. The left tank of a radiator is divided on two parts that allows to provide more effectively heat removal from a cooling liquid. For removal from a path of air stoppers the special ventilating stopper is provided.
Design of the pump of an intermediate cooler
The drive крыльчатки the pump of an intermediate cooler is carried out from the individual electromotor.
Which capacity makes an order of 28 Vt at opening throttle заслонки less than 80 % and 50 Vt at большем opening заслонки. The given scheme is realised for the purpose of economy of expenses of capacity.
The valve перепускания air in pressurisation system
As already it was told above, at sharp closing throttle заслонки in system of an admission of air there can be a low-frequency rumble. For the purpose of minimisation of a sound background at braking by the engine in a path of system of a turbo-supercharging it is included special перепускной the valve. The valve works under the influence of the depression arising for throttle заслонкой at its sharp closing, as a result air from the throttle chamber перенаправляется on a compressor input.
Design перепускного the valve of dump of pressure
Diagnostics of malfunctions of system of a turbo-supercharging
Infringements of functioning of system of a turbo-supercharging can lead to following consequences:
At a pressurisation elevated pressure:
a) the Detonation of an air-fuel mix.
At the underestimated pressure of pressurisation:
b) capacity Loss
c) Decrease приемистости;
d) Increase of the expense of fuel.
At oil leaks:
e) the Raised expense of oil;
f) Formation of a white smoke on an exit of system of release of the fulfilled gases.