LEXUS RX 300

1998-2003 of release

Repair and car operation

Systems of release and decrease in toxicity of the fulfilled gases

The general information

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

Components of systems of decrease in toxicity ОГ

1 — the Vacuum receiver 2 — Valve PCV 3 — VSV systems EVAP 4 — the Service union of system EVAP 5 — VSV valve CCV 6 — Bottom каталитический the converter 7 — the Katalitichesky converter of some cylinders 1 8 — the Katalitichesky converter of some cylinders 2 9 — a purge Line 10 — the Line of giving of air	11 — the Gauge of pressure of fuel evaporations 12 — system EVAP Line 13 — a ventilation Line 14 — VSV the valve of a purge of an adsorber 15 — the Cover of a jellied mouth of a fuel tank 16 — the Jellied mouth of a fuel tank 17 — the Hose of dump of air 18 — the Coal adsorber 19 — the Fuel tank 20 — the Valve отсечки 21 — the Control valve of level of fuel

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 in 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.