Patent ID: 11927147
Assignee: AISAN KOGYO KABUSHIKI KAISHA
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 0:
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;
a controller configured to control an operation of the pump; and
a temperature acquirer configured to acquire a fuel temperature of the diesel fuel,
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,
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, and
in a case where the acquired fuel temperature is lower than a second threshold when a stop request for stopping the pump is received from outside while the pump is in operation, the controller is configured to stop the pump after allowing the pump to operate with an increased load for a predetermined period.