Robert Boschgmbh

Yujiang Xu

Ling Li

Peter Huebner

Rui Qian

Modepally Kiran Kumar

Zhongzheng Liu

Honglong Zhou

Siwei Dong

The invention concerns a method () of detecting an emulator for an SCR catalytic converter system () with the following steps: operating the SCR catalytic converter system () in a test state; and measuring a test variable of the SCR catalytic converter system (); and deciding whether the test variable is behaving as for an SCR catalytic converter system () with or without an emulator.

Method of detecting an emulator for an SCR catalytic converter system

Disclosed is an exhaust gas aftertreatment system () for a diesel engine, the exhaust gas aftertreatment system comprising: a treatment agent tank () for storing an exhaust gas treatment agent; a metering injection module (), with the injection of the metering injection module () being controlled with a determined duty ratio signal according to a desired injection amount; a supply module () connected between the treatment agent tank () and the metering injection module () for supplying the exhaust gas treatment agent to the metering injection module (); an exhaust gas treatment agent pipe () connected between the metering injection module () and the supply module (); a pressure sensor for measuring the system pressure in the exhaust gas treatment agent pipe (); and a controller (); wherein the controller () is configured to receive a system pressure signal from the pressure sensor during injection of the metering injection module (), and detect an injection abnormality of the metering injection module () based on at least a first amount, which represents an actual injection amount and is determined by the system pressure signal, and a second amount, which represents a theoretical injection amount and is determined by a corresponding duty ratio signal. A corresponding injection abnormality detection method is further disclosed. The injection abnormality detection method is simple and reliable.

Exhaust gas aftertreatment system for diesel engine and method of detecting abnormal injection

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Wuxi, China

Yujiang Xu