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US 9,284,876 B2Granted
System and method for cooling engine pistons
AssigneeFord Global Technologies, LLC
InventorsDavid Karl Bidner, Joseph Norman Ulrey, Yihua (Eva) Barber
Life of this patent
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Abstract
An engine cooling system and method for operating the engine cooling system is disclosed. In one example, engine oil is sprayed on to a piston via piston cooling jets. The approach judges whether or not to operate the piston cooling jets based on a benefit assessment. The approaches may be suitable for systems that include a variable oil pump.
Claims19
A method for operating an engine, comprising:
- operating a piston cooling jet in response to an engine torque difference between operating at a borderline spark while operating the piston cooling jet at an engine speed and load, and operating at a borderline spark while not operating the piston cooling jet at the engine speed and load.
A method for operating an engine, comprising:
- operating engine cooling jets in response to an engine friction torque difference between operating engine cooling jets at an engine speed and load, and not operating engine cooling jets at the engine speed and load;
- and
- operating the engine cooling jets responsive to an engine torque difference between operating at a borderline spark while operating piston cooling jets at an engine speed and load, and operating at a borderline spark while not operating the piston cooling jets at the engine speed and load.
An engine system, comprising:
- a piston;
- a piston cooling jet selectively spraying oil on the piston;
- an oil pump supplying oil to the piston cooling jet;
- and
- a controller including executable non-transitory instructions for adjusting the oil pump to vary output of the oil pump in response to a determined difference between two engine torques.
2 more elements
Dependencies are inferred from the claim text.