FIELD: engines and pumps.
SUBSTANCE: invention relates to purification of internal combustion engine exhaust gases. Exhaust gas composition control apparatus includes an exhaust passage, a urea water tank, a urea adding valve, a urea pump, a pipe, and an electronic control unit. Electronic control unit is configured to drive the urea pump to perform a filling control when a condition requiring an execution of urea water addition to the exhaust gas in the exhaust passage by the urea adding valve is satisfied so that the pipe is filled with the urea water. Electronic control unit is configured to execute filling control when an exhaust pressure of the exhaust passage is equal to or less than a specified value. Electronic control unit is configured to stop the filling control when the exhaust pressure of the exhaust passage exceeds the specified value during execution of filling control.
EFFECT: invention will enables to prevent pump operation associated with an unnecessary filling operation.
4 cl, 2 dwg
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