ABNORMALITY DIAGNOSTICS DEVICE FOR A REDUCING AGENT ADDITION DEVICE Russian patent published in 2019 - IPC F01N3/08 F01N11/00 

FIELD: control and measuring equipment; pump building.

SUBSTANCE: invention relates to a device for diagnosing abnormalities for a device for adding a reducing agent. Device includes an additive valve configured to add a reducing agent to exhaust gases flowing through the internal combustion engine discharge channel. There is also an electric pump configured to inject a reducing agent accumulated in the reservoir for the reducing agent. Reducing agent supply channel is configured to introduce a reducing agent pumped from the pump into the adding valve. Pressure sensor is configured to determine pressure in the supply channel of the reducing agent. Device for diagnosing abnormalities is applied to a device for adding a reducing agent. Anomaly diagnosis device comprises a pump control module. Module is configured to control the voltage applied to the pump as equal to the diagnostic voltage, which is the voltage at which the pressure determined by the pressure sensor becomes the preset pressure, in a state in which the adding valve is closed. Additive valve control module is configured to switch the additive valve from the closed valve state to the valve open state in a state, in which the voltage applied to the pump is maintained equal to the diagnostic voltage by the pump control module. Diagnostic parameter obtaining module is configured to obtain a diagnostic parameter, which is a parameter correlated with the pressure reduction value of the reducing agent supply channel, based on the pressure determined by the pressure sensor after the adding valve switches from the closed state of the valve to the open state of the valve by means of the control module of the adding valve. Abnormality diagnostics module configured to diagnose an abnormality of a device for adding a reducing agent by performing a comparison between a diagnostic parameter obtained by the diagnostic parameter generation module and a predetermined threshold value. Pump pressure receiving module is made capable to receive pressure capacity of the pump, which represents pumping quantity per pump revolution. Correction module is configured to correct any of the diagnostic parameters obtained by the diagnostic parameter generation module and the preset threshold value, based on the pump injection capacity obtained by the pump injection pressure generation module. Abnormality diagnostics module is configured to diagnose an abnormality of a device for adding a reducing agent by using a diagnostic parameter or a predetermined threshold value corrected by a correction module.

EFFECT: possibility to provide a technology which can suppress reduced accuracy of diagnostics under influence of pump pressure capacity in device of diagnostics of abnormalities for device of adding of reducing agent.

5 cl, 23 dwg