System and method for cold temperature control of an electric oil pump
AssigneePolaris Industries Inc.
InventorsDallas J. Blake, James H. Buchwitz
Life of this patent
Estimating the term…
Abstract
An apparatus and method for controlling an electric oil pump with a pump control signal generated by an electronic control unit (ECU) of a vehicle. The pump control signal has a variable drive time portion during which the electric oil pump is actuated to supply oil to an engine of the vehicle and a variable cycle time defining a frequency of the pump control signal.
Claims28
A method of controlling an electric oil pump with a pump control signal generated by an electronic control unit (ECU) of a vehicle, the pump control signal having a variable drive time portion during which the electric oil pump is actuated to supply oil to an engine of the vehicle and a variable cycle time defining a frequency of the pump control signal, the method comprising:
- determining a base pump volume of the electric oil pump;
- determining a temperature associated with the engine;
- determining a corrected pump volume by correcting the base pump volume using the determined temperature;
- determining a speed of the engine;
- determining a frequency of the pump control signal based on the determined engine speed and the corrected pump volume;
- determining a drive time of the pump control signal based on both the determined engine speed and the determined temperature;
- and
- controlling the electric oil pump using the pump control signal having the determined drive time and the determined frequency.
A method of controlling an electric oil pump with a pump control signal generated by an electronic control unit (ECU) of a vehicle, the pump control signal having a variable drive time portion during which the electric oil pump is actuated to supply oil to an engine of the vehicle and a variable cycle time defining a frequency of the pump control signal, the method comprising:
- determining a speed of the engine;
- determining a temperature associated with the engine;
- determining a number of initial ineffective oil pump actuations after start up of the engine due to a high oil viscosity based on the determined temperature;
- determining a volume of oil to deliver from the electric oil pump to the engine independent of the determined number of initial ineffective oil pump actuations;
- determining a frequency of the pump control signal and a drive time of the pump control signal based on both the determined temperature and determined engine speed to deliver the determined volume of oil from the electric oil pump to the engine;
- and
- controlling the electric oil pump using the pump control signal having the determined drive time and the determined frequency.
A method of controlling an electric oil pump with a pump control signal generated by an electronic control unit (ECU) of a vehicle, the pump control signal having a variable drive time portion during which the electric oil pump is actuated to supply oil to an engine of the vehicle and a variable cycle time defining a frequency of the pump control signal, the method comprising:
- determining a base pump volume of the electric oil pump;
- determining a temperature associated with the engine;
- determining a corrected pump volume by correcting the base pump volume using the determined temperature;
- determining a speed of the engine;
- determining a frequency of the pump control signal based on the determined engine speed and the corrected pump volume;
- determining a base drive time of the pump control signal;
- sensing a voltage of a chassis of the vehicle and correcting the base drive time of the pump control signal based on the sensed chassis voltage;
- and
- controlling the electric oil pump using the pump control signal having the determined frequency and the corrected drive time.
Dependencies are inferred from the claim text.