Urea-SCR system and control method thereof

Details Urea-SCR system and control method thereof Urea-SCR system and control method thereof

2009-02-25

2011-12-20

Denion, Thomas E. (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

Having sensor or indicator of malfunction, unsafeness, or...

C060S274000, C060S286000, C060S295000, C060S297000, C060S301000, C060S311000

Reexamination Certificate

active

08079209

ABSTRACT:
A method for controlling an urea-SCR system may include a first step for calculating a target urea injection amount, a second step that uses urea injection pressure and urea injection time to calculate a real urea injection amount, a third step that calculates a difference value between the target urea injection amount and the real urea injection amount, and monitors the difference value at a predetermined time interval, a fourth step that accumulates difference values for a determined time when the difference value exceeds a predetermined level, and transfers an alarm signal to a driver when the average value thereof exceeds a predetermined level, and/or a fifth step that starts to accumulate a number of engine starts and driving distance after transferring the alarm signal, and when the number of engine starts is larger than a predetermined value or the driving distance is longer than a predetermined value, if the difference value does not become lower than a predetermined level, executes urea recharging means for a driver to charge a urea tank with a urea solution. The urea consumption amount may be continuously monitored, the remained urea amount may be accurately detected, and the urea recharging may be induced in time such that the nitrogen oxide exhaust is prevented.

REFERENCES:
patent: 5522218 (1996-06-01), Lane et al.
patent: 6063350 (2000-05-01), Tarabulski et al.
patent: 6487852 (2002-12-01), Murphy et al.
patent: 7861518 (2011-01-01), Federle
patent: 7946109 (2011-05-01), Potter et al.
patent: 7954311 (2011-06-01), Shaikh et al.
patent: 7954312 (2011-06-01), Gresens
patent: 2007/0163245 (2007-07-01), Sheridan et al.

Affiliated with

Also associated with

Rating

Urea-SCR system and control method thereof does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Urea-SCR system and control method thereof, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Urea-SCR system and control method thereof will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4266219