Denso CRS - Exhaust Gas Control System

Operation Section
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7.4 Exhaust Gas Control System
(1) General Description
• The exhaust gas control system is provided to improve warm-up and heater performance. This system actuates the
exhaust gas control valve VSV, which is attached to the exhaust manifold. It increases the exhaust pressure to in-
crease the exhaust temperature and engine load, in order to improve warm-up and heater performance.
(2) Operation
• The exhaust gas control system operates when the warm-up switch is ON, and all the conditions listed below have
been met.
Operation Conditions
- The EGR is operating.
- The coolant temperature is below 70°C.
- The ambient temperature is below 5°C.
- A minimum of 10 seconds have elapsed after starting the engine.
- The engine speed and fuel injection quantity are in the state shown in the graph below.
Air Cleaner
Exhaust Gas
Control Valve
Exhaust Gas
Control Valve
Vacuum Pump
VSV
Turbo Pressure
Sensor
Coolant Temperature
Sensor
EGR Valve Position
Sensor
Warm-Up Switch
Mass Airflow Meter
Cylinder
Recognition Sensor
(TDC (G) Sensor)
Accelerator
Position Sensor
Atmospheric
Pressure Sensor
ECU
Q000906E
Q000907E
WARM UP
Engine Speed
Operating Range
Extremely Low Torque
or Engine Speed Range
[Exhaust Gas Control System Operating Range]
Injection Quantity