US 12,134,994 B2
Pump unit
Yukihiko Yato, Obu (JP)
Assigned to AISAN KOGYO KABUSHIKI KAISHA, Obu (JP)
Filed by AISAN KOGYO KABUSHIKI KAISHA, Obu (JP)
Filed on Feb. 5, 2024, as Appl. No. 18/432,929.
Application 18/432,929 is a continuation of application No. 17/641,640, granted, now 11,927,147, previously published as PCT/JP2020/028762, filed on Jul. 27, 2020.
Claims priority of application No. 2019-172989 (JP), filed on Sep. 24, 2019.
Prior Publication US 2024/0175404 A1, May 30, 2024
Int. Cl. F02D 41/00 (2006.01); F02D 41/30 (2006.01)
CPC F02D 41/3082 (2013.01) [F02D 2200/0602 (2013.01); F02D 2200/0606 (2013.01); F02D 2200/50 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A pump unit comprising:
a pump configured to increase a pressure of diesel fuel and discharge the diesel fuel to a fuel passage in which a filter is disposed; and
a controller configured to control an operation of the pump,
wherein
the controller is configured to execute freeze avoidance control in which the operation of the pump is controlled using an index that indicates a degree of clogging of the filter caused by the diesel fuel freezing and is acquired while the pump is not in operation, and
in the freeze avoidance control, the controller is configured to apply a higher load to the pump as the degree of clogging of the filter indicated by the index is higher.