US 12,085,001 B2
Heater control in heavy-duty motor vehicle engines
Cynthia Chaffin Webb, Sedro-Woolley, WA (US); Charles Wayne Reinhardt Swart, Bellingham, WA (US); Maarten Meijer, Anacortes, WA (US); Varun Ramesh, Bellingham, WA (US); and John Lahti, Anacortes, WA (US)
Assigned to PACCAR Inc, Bellevue, WA (US)
Filed by PACCAR Inc, Bellevue, WA (US)
Filed on Jun. 28, 2023, as Appl. No. 18/343,660.
Application 18/343,660 is a continuation of application No. 17/002,511, filed on Aug. 25, 2020, granted, now 11,725,560.
Claims priority of provisional application 63/057,090, filed on Jul. 27, 2020.
Claims priority of provisional application 63/056,131, filed on Jul. 24, 2020.
Claims priority of provisional application 63/054,468, filed on Jul. 21, 2020.
Prior Publication US 2024/0060439 A1, Feb. 22, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. F01N 3/00 (2006.01); F01N 3/035 (2006.01); F01N 3/20 (2006.01); F01N 3/28 (2006.01)
CPC F01N 3/2066 (2013.01) [F01N 3/035 (2013.01); F01N 3/2892 (2013.01); F01N 2240/20 (2013.01); F01N 2570/14 (2013.01); F01N 2610/02 (2013.01); F01N 2610/146 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A heavy-duty truck, comprising:
a diesel engine;
an exhaust after-treatment system; and
an engine control unit configured to:
operate a diesel engine of a heavy-duty truck such that the diesel engine generates an exhaust gas flow; and
while the diesel engine is operating, operate an exhaust after-treatment system of the heavy-duty truck to maintain a temperature of the exhaust gas flow at a selective catalytic reduction system of the exhaust after-treatment system at a constant target temperature by:
calculating a rate at which heat energy is provided from the diesel engine to the exhaust gas flow, calculating a target rate of heat energy for the exhaust gas flow at the selective catalytic reduction system based on the constant target temperature, calculating a rate at which to provide supplemental heat energy from a heater of the exhaust after-treatment system to the exhaust gas flow based on the calculated rate at which heat energy is provided from the diesel engine to the exhaust gas flow and the calculated target rate of heat energy, and operating the heater to provide supplemental heat energy to the exhaust gas flow at the calculated rate,
wherein calculating the rate at which heat energy is provided from the diesel engine to the exhaust gas flow includes averaging a product of a temperature of the exhaust gas flow as it enters the exhaust after-treatment system, a mass flow rate of the exhaust gas flow, and a molar specific heat of the exhaust gas flow across a moving average window of time.