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1. (WO2018146043) METHOD AND APPARATUS FOR INJECTION FLOW RATE MONITORING

Pub. No.:    WO/2018/146043    International Application No.:    PCT/EP2018/052794
Publication Date: Fri Aug 17 01:59:59 CEST 2018 International Filing Date: Tue Feb 06 00:59:59 CET 2018
IPC: F01N 3/20
Applicants: ROBERT BOSCH GMBH
Inventors: LI, Ling
Title: METHOD AND APPARATUS FOR INJECTION FLOW RATE MONITORING
Abstract:
The present invention relates to a method and apparatus for flow rate monitoring, the method comprising: obtaining a first signal, which indicates a pressure at which a reductant, used to treat exhaust gas of an engine of a vehicle, is supplied to a reductant injection unit by a reductant supply unit of the vehicle; acquiring a first frequency domain signal corresponding to the first signal; and determining whether an actual injection flow rate of the reductant injection unit is in an abnormal state, based on whether an amplitude, at an injection frequency of the reductant injection unit, of the first frequency domain signal is outside a target amplitude interval. The method and apparatus can check whether the actual injection flow rate of the reductant injection unit of the vehicle is in an abnormal state in a simple manner.