LEXUS RX 300

1998 — 2003 of release

Repair and car operation


RX 300 Lexus
+ Lexus RX-300 Cars
+ Governing bodies and operation receptions
+ Settings and routine maintenance of the car
+ Engine
+ Systems of cooling of the engine, heating, ventilation and air conditioning
- Power supply system and production of the fulfilled gases
   + Power supply system
   - Systems of release and decrease in toxicity of the fulfilled gases
      General information
      PCV system check
      EVAP system check
      Check of catalytic converters
+ Systems of electric equipment of the engine
+ Automatic transmission and interaxal differential
+ Transmission line
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment
+ Schematic diagrams of electric connections



Systems of release and decrease in toxicity of the fulfilled gases

General information

System of release of OG

The system of production of the fulfilled gases consists of final collectors, reception pipes, catalytic converters, exhaust silencers and an exhaust pipe.

Systems of decrease in toxicity of the fulfilled gases

Components of systems of decrease in toxicity of OG

1 — the Vacuum receiver
2 — the PCV Valve
3 — EVAP system VSV
4 — the Service union of EVAP system
5 — the VSV valve CCV
6 — Nizhny the catalytic converter
7 — the Catalytic converter of a number of cylinders 1
8 — the Catalytic converter of a number of cylinders 2
9 — the purge Line
10 — the Line of supply of air

11 — the Sensor of pressure of fuel evaporations
12 — the EVAP system Line
13 — the ventilation Line
14 — the VSV 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 dumping of air
18 — the Coal adsorber
19 — the Fuel tank
20 — the otsechka Valve
21 — the Control valve of level of fuel

Scheme of work of systems of decrease in toxicity of OG

1 — the Service union of EVAP system
2 — the Sensor of pressure of fuel evaporations
3 — the purge Line
4 — EVAP system VSV
5 — the EVAP system Line
6 — the ventilation Line
7 — the Coal adsorber
8 — the Fuel tank
9 — the Hose of dumping of air
10 — the VSV valve of a purge of an adsorber

11 — the Line of supply of air
12 — the VSV valve CCV
13 — the Air purifier
14 — the Lambda probe of 1 number of cylinders 2 (the sensor of quality of a mix)
15 — the Lambda probe of 1 number of cylinders 1 (the sensor of quality of a mix)
16 — the Catalytic converter of a number of cylinders 1
17 — the Catalytic converter of a number of cylinders 2
18 — the Lambda probe 2
19 — Nizhny the catalytic converter

The principle of functioning of a control system of the engine is constructed so that to receive the maximum return from the engine at the minimum fuel consumption and the maintenance of toxic components in OG. The system of catching of fuel evaporations (EVAP) prevents hit of last of a fuel tank in the atmosphere. The system of ventilation of a case (PCV) is established also.

System of operated ventilation of a case (PCV)

For elimination of leakages of not burned down hydrocarbons in the atmosphere the engine completely загерметизирован. Gases and pairs of oil which are forming in a case, via the mesh filter get to the inlet pipeline and burn down in cylinders together with fuel.

Gases are removed from a case at the expense of a pressure difference in a case and the inlet pipeline (pressure in a case is higher).

System of catching of fuel evaporations (EVAP)

The EVAP system is intended for decrease in emission in the atmosphere of not burned 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 pairs of fuel which are forming in a tank during parking of the car gather, and keep there until on a signal of the control unit the adsorber purge will not begin. During a purge of pair of fuel move via the purge valve in the inlet pipeline where they mix up with a working mix and further burn down usually in combustion chambers.

For ensuring normal operation of the engine on single turns and during warming up the control unit holds the valve the closed. Thus hit of not burned down fuel in the converter (is prevented at the raised turns of idling a mix переобогащена). After engine warming up the valve starts to open and be closed, submitting pairs of fuel to an inlet path.

Catalytic converter and lambda probes

For decrease in number of harmful emissions three-functional catalytic converters are built in the atmosphere in system of release. The control system of injection of fuel has feedback in which are included a lambda probes, constantly informing the control unit about OG structure. Depending on the received data, the control unit corrects quality of the mix submitted to chambers of combustion and, thus, optimizes fuel combustion.

In a lambda probe, established behind catalytic converters, the heating element which is switched on by the control unit through the special relay is built in. The working surface a lambda probe is sensitive to change of the content of oxygen in OG. Depending on concentration of oxygen target tension of the sensor changes. If a mix переобогащена (the content of oxygen in the fulfilled gases very low), the lambda probe submits signals with a low voltage. Tension increases in process of pauperization of a mix and increase in the content of oxygen in gases. Most effectively the converter works at optimum composition of gas mixture (14.7 parts of air for 1 part of fuel). At optimum concentration of oxygen in OG there is a jump in tension on a lambda probe. This jump is a reference point for the control unit at correction of quality of a mix.

It is established three lambda probe: on one in front of the top catalytic converters (these a lambda probes at the same time are sensors of quality of an air and fuel mix) and one behind the bottom converter. It reaches more exact tracking of structure of OG.