Fishman Stewart PLLC
Method and apparatus for determining cooling gallery fill in a piston
A system includes an engine block having a plurality of cylinder-piston combinations. At least one of the cylinder-piston combinations includes a cylinder, a piston positioned in the cylinder and coupled to a connecting rod, the piston having an internal cooling gallery about a circumference of the piston, an oil jet for introducing coolant into the cooling gallery, and at least one pressure sensor positioned within the piston to detect pressure fluctuations within the cooling gallery. The system includes a processor having a program coupled thereto. The processor is configured to detect cyclical pressure fluctuations within the cooling gallery, via the at least one pressure sensor, during a linear motion of the piston within the engine block, determine pressures that occur during the detected cyclical pressure fluctuations, and determine a fill ratio of coolant within the cooling gallery based on the determined pressures.
Mahle International GmbH
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Michael T. Yu
Lapp Chen