| 摘要 |
An exhaust gas recirculation system which comprises a passage provided between an exhaust passage of an internal combustion engine and an intake passage thereof, a valve provided at an intermediate portion of the passage for regulating a flow of an exhaust gas recirculated through the passage, a fuel distillation part for sensing a fuel distillation characteristic of a fuel within a fuel tank, an engine temperature part for sensing an engine temperature of the internal combustion engine, a first valve control part, and a second valve control part. The first valve control part generates a reference value at which the valve is turned ON allowing the exhaust gas recirculation to the intake passage, the reference value being varied to a first level when the fuel is a heavy type fuel and varied to a second level when the fuel is a light type fuel, the first level being higher than the second level. The second valve control part compares the engine temperature with the reference value, so that the valve is turned off stopping the exhaust gas recirculation while the engine temperature is not higher than the reference value, and the valve is turned on allowing the exhaust gas to be recirculated to the intake passage after the engine temperature exceeds the reference value. It is possible to vary the reference value in accordance with the fuel distillation characteristic of the fuel used, preventing driveability from worsening and properly reducing the amount of nitrogen oxide in the exhaust gas.
|
