System for controlling the urea supply to SCR catalysts

Details System for controlling the urea supply to SCR catalysts System for controlling the urea supply to SCR catalysts

2007-02-20

2007-02-20

Denion, Thomas (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

C060S287000, C060S299000, C060S301000

Reexamination Certificate

active

11017363

ABSTRACT:
A reductant dosing control system, for use in a Selective Catalytic Reduction (SCR) system of a motor vehicle includes an input receiving a NOx feedback signal from an NOx sensor provided to the SCR system. A base dosing module calculates a required quantity of reductant to inject in front of a SCR catalyst of the SCR system based on the NOx feedback signal. The SCR catalyst has ammonia storage properties. An output signals a reductant metering mechanism to periodically or continuously inject excess reductant based on the required quantity of reductant.

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