Method of controlling an auxiliary pump for a transmission
AssigneeGM Global Technology Operations LLC
InventorsGoro Tamai, Jy-Jen F. Sah, Eric S. Tryon, Scott A. Miller, Steven J. Shepherd
Life of this patent
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Abstract
A method of operating an auxiliary pump for an electrically variable transmission includes purging the auxiliary pump when an auxiliary pump temperature is below a minimum operating temperature and above a minimum purge temperature. The auxiliary pump fluid temperature and the minimum purge temperature are determined based upon the transmission fluid temperature and the ambient temperature.
Claims13
A method for operating an auxiliary pump for an electrically variable transmission for a vehicle comprising:
- obtaining an ambient temperature and a transmission fluid temperature;
- comparing the ambient temperature with the transmission fluid temperature to determine an auxiliary fluid temperature, a minimum operating temperature, and a minimum purge temperature;
- comparing the auxiliary fluid temperature with the minimum purge temperature;
- purging the auxiliary pump when the auxiliary pump temperature is below a minimum operating temperature and above the minimum purge temperature;
- and
- instructing a shift to electric vehicle mode of the transmission when one of the auxiliary pump temperature is not less than the minimum operating temperature and the purging of the auxiliary pump is completed.
A method for operating an electrically variable transmission for a vehicle comprising:
- obtaining an ambient temperature and a transmission fluid temperature;
- comparing the ambient temperature with the transmission fluid temperature to determine an auxiliary fluid temperature, a minimum operating temperature, and a minimum purge temperature;
- comparing the auxiliary fluid temperature with the minimum purge temperature;
- starting the auxiliary pump when the auxiliary pump temperature is below a minimum operating temperature and above the minimum purge temperature;
- stopping the auxiliary pump;
- and
- instructing a shift to electric vehicle mode.
Dependencies are inferred from the claim text.