US 9,810,167 B2
Catalyst advanced warmup control device for spark ignition engine
Tomomi Watanabe, Higashihiroshima (JP); Shigeyuki Hirashita, Hiroshima (JP); Naoki Kishikawa, Hatsukaichi (JP); and Keiji Araki, Hatsukaichi (JP)
Assigned to MAZDA MOTOR CORPORATION, Hiroshima (JP)
Appl. No. 14/655,704
Filed by MAZDA MOTOR CORPORATION, Hiroshima (JP)
PCT Filed Jan. 15, 2014, PCT No. PCT/JP2014/000157
§ 371(c)(1), (2) Date Jun. 25, 2015,
PCT Pub. No. WO2014/112370, PCT Pub. Date Jul. 24, 2014.
Claims priority of application No. 2013-005230 (JP), filed on Jan. 16, 2013.
Prior Publication US 2015/0337751 A1, Nov. 26, 2015
Int. Cl. F02D 41/02 (2006.01); F01N 9/00 (2006.01); F02D 43/04 (2006.01); F02D 41/06 (2006.01); F02D 13/02 (2006.01); F02P 5/15 (2006.01); F02D 37/02 (2006.01); F02D 41/00 (2006.01); F01N 3/20 (2006.01); F02B 23/10 (2006.01)
CPC F02D 41/0255 (2013.01) [F01N 3/2006 (2013.01); F01N 9/00 (2013.01); F02D 13/02 (2013.01); F02D 37/02 (2013.01); F02D 41/0002 (2013.01); F02D 41/0245 (2013.01); F02D 41/064 (2013.01); F02D 43/04 (2013.01); F02P 5/1502 (2013.01); F02P 5/1506 (2013.01); F01N 2430/08 (2013.01); F01N 2900/1626 (2013.01); F02B 23/104 (2013.01); F02D 2041/001 (2013.01); Y02T 10/18 (2013.01); Y02T 10/26 (2013.01); Y02T 10/42 (2013.01); Y02T 10/46 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A rapid catalyst warmup control device for a spark ignition engine, which is configured to, when a catalytic converter provided in an exhaust passage is in an un-activated state, increase an intake air amount, as compared to when the catalytic converter is in an activated state under a same engine operation condition, and retard an ignition timing beyond a top dead center of a compression stroke, comprising:
an ignition timing setting section configured to set the ignition timing in such a manner that a retard amount thereof from a top dead center of a compression stroke becomes larger as an external load causing a rotational resistance of the engine becomes lower; and
an exhaust valve opening timing setting section configured to set a valve opening start timing of an exhaust valve in a subsequent expansion stroke according to combustion of an air-fuel mixture ignited at the ignition timing set by the ignition timing setting section in such a manner that when the external load is lower than a given reference load, the exhaust valve starts opening before an in-cylinder pressure reaches a peak, wherein the in-cylinder pressure is based on the exhaust valve being maintained in a valve-closed state.