LEXUS RX 300
1998-2003 of release
Repair and car operation
Lexus RX 300
+ Cars Lexus RX-300
+ Controls and operation receptions
+ Options and car routine maintenance
+ The engine
+ Systems of cooling of the engine, heating, ventilation and air conditioning
- The power supply system and release of the fulfilled gases
+ The power supply system
- Systems of release and decrease in toxicity of the fulfilled gases
The general information
System PCV check
System EVAP check
Check каталитических converters
+ Systems of an electric equipment of the engine
+ Automatic transmission and interaxal differential
+ Transmissionnaja line
+ Brake system
+ Suspension bracket and steering
+ Onboard electric equipment
+ Basic schemes of electric connections
Systems of release and decrease in toxicity of the fulfilled gases
System of release ОГ
The system of release of the fulfilled gases consists of final collectors, reception pipes, каталитических converters, mufflers and an exhaust pipe.
Systems of decrease in toxicity of the fulfilled gases
The scheme of work of systems of decrease in toxicity ОГ
The principle of functioning of a control system of the engine is constructed so that to receive the maximum return from the engine at minimum the expense of fuel and the maintenance of toxic components in ОГ. The system of catching of fuel evaporations (EVAP) prevents hit of last of a fuel tank in atmosphere. The ventilation system картера (PCV) is established also.
System of operated ventilation картера (PCV)
For elimination of leaks of not burnt down hydrocarbons in atmosphere the engine completely загерметизирован. Gases and steams of oil formed in картере, through the mesh filter get to the inlet pipeline and burn down in cylinders together with fuel.
Gases leave from картера for the account of a difference of pressure in картере and the inlet pipeline (pressure in картере above).
System of catching of fuel evaporations (EVAP)
System EVAP is intended for emission decrease in atmosphere of not burnt down hydrocarbons. The jellied mouth of a fuel tank is tightly closed by a cover, under a fuel tank the coal adsorber is established. In it steams of fuel formed in a tank during parking of the car gather, and are kept there until on a signal of the block of management the adsorber purge will not begin. During a purge of pair fuel move through the purge valve in the inlet pipeline where they mix up with a working mix and further burn down in the usual image in combustion chambers.
For maintenance of normal work of the engine on single turns and during warming up the management block holds the valve the closed. Thus hit of not burnt down fuel in the converter (is prevented at the raised turns of idling a mix переобогащена). After warming up of the engine the valve starts to open and be closed, submitting fuel steams to an inlet path.
The Katalitichesky converter and ljambda-probes
For decrease in quantity of harmful emissions atmosphere in release system are built in трёхфункциональные каталитические converters. The control system of fuel injection has a feedback in which the ljambda-probes constantly informing the block of management about structure OG are included. Depending on the received data, the management block corrects quality of the mix submitted to the chambers of combustion and, thus, optimises fuel combustion.
In a ljambda-probe established for каталитическими by converters, the heating element included by the block of management through the special relay is built in. The working surface of a ljambda-probe is sensitive to change of the maintenance of oxygen in ОГ. Depending on concentration of oxygen target pressure of the gauge varies. If the mix переобогащена (the oxygen maintenance in the fulfilled gases very low), a ljambda-probe submits signals with a low voltage. Pressure increases in process of pauperisation of a mix and increase in the maintenance of oxygen in gases. Most effectively the converter works at optimum structure of a gas mixture (14.7 parts of air on 1 part of fuel). At optimum concentration of oxygen in ОГ there is a jump in pressure on a ljambda-probe. This jump is a reference point for the management block at updating of quality of a mix.
It is established three ljambda-probes: on one before top каталитическими converters (these ljambda-probes simultaneously are gauges of quality of an air-fuel mix) and one behind the bottom converter. It reaches more exact tracing of structure OG.