Lubrication oil warm-up for a fluid pump
AssigneeCaterpillar Inc.
InventorsYuesheng He, Todd Ryan Kabrich, Jared M. Kirk, David J. Schuh
Life of this patent
Estimating the term…
Abstract
A controller may cause, in a lubrication oil warm-up mode of a transmission, the transmission to operate in a stall mode that transfers heat to transmission oil for the transmission. The transmission oil may be diverted to a lubrication oil heater to heat the lubrication oil using the transmission oil. The controller may cause the transmission to disengage the stall mode and to engage a park mode, to pause the lubrication oil warm-up mode. The controller may cause the transmission to operate in the stall mode, to resume the lubrication oil warm-up mode, after the pause duration.
Claims12
A fluid system, comprising:
- an engine cooling system to circulate engine coolant in an engine;
- a transmission lubrication system to circulate transmission oil in a transmission;
- a pump lubrication system to circulate lubrication oil in a fluid pump, the pump lubrication system comprising:
- a lubrication oil heater to heat the lubrication oil circulated through the lubrication oil heater using the transmission oil;
- a lubrication oil cooler, in parallel with the lubrication oil heater, to cool the lubrication oil circulated through the lubrication oil cooler using the engine coolant;
- and
- a lubrication oil mixer to mix heated lubrication oil from the lubrication oil heater and cooled lubrication oil from the lubrication oil cooler, and to supply mixed lubrication oil to the fluid pump;
- and
- a controller configured to cause, in a lubrication oil warm-up mode, the transmission to operate in a stall mode that transfers heat to the transmission oil.
Dependencies are inferred from the claim text.