Engine operation based on integrated starter-generator temperature
A vehicle includes an engine and a controller. The controller may be configured to, responsive to indication of a temperature of a starter-generator exceeding a de-rated threshold, command the engine to start and disable engine automatic shut-off. And the controller may be configured to, responsive to indication of the temperature exceeding a disabled threshold, or the temperature exceeding the de-rated threshold and a traction battery discharge power being less than a threshold, command the engine to start and shed a load.
1. A vehicle comprising:
an engine; and
a controller configured to,
responsive to indication of a temperature of a starter-generator exceeding a de-rated threshold, command the engine to start and disable engine automatic shut-off,
responsive to indication of the temperature exceeding a disable threshold, or the temperature exceeding the de-rated threshold and a traction battery discharge power being less than a threshold, command the engine to start and shed a load, and
responsive to indication of the temperature dropping below the de-rated threshold and dropping below a first threshold, enable engine shut-off, wherein the first threshold is less than the de-rated threshold and the de-rated threshold is less than the disable threshold.
2. The vehicle of claim 1 , wherein the controller is further configured to, responsive to indication of the temperature dropping below the disable threshold and the de-rated threshold, enable automatic engine shut-off and permit enabling of the load.
3. The vehicle of claim 2 , wherein the load is a seat heater, a seat ventilator, a positive thermal coefficient heating element, or an air conditioner compressor.
4. The vehicle of claim 1 , wherein the de-rated threshold is greater than a first percentage of a Curie temperature, and wherein the first percentage is associated with a permanent magnetic field strength (PMFS) having a value that is ½ of the PMFS at 0 degrees Celsius.
5. The vehicle of claim 4 , wherein the disable threshold is greater than a second percentage of the Curie temperature and less than the de-rated threshold, and wherein the second percentage is associated with the PMFS having a value that is ¼ of the PMFS at 0 degrees Celsius.
6. The vehicle of claim 1 , wherein the starter-generator is a belt integrated starter-generator.
7. A vehicle comprising:
an engine;
an integrated starter-generator (ISG); and
a controller configured to,
responsive to indication of a ISG temperature exceeding a de-rated threshold that is greater than a percentage of a Curie temperature, command the engine to start and disable engine automatic shut-off, wherein the percentage is associated with a permanent magnetic field strength (PMFS) having a value that is ½ of the PMFS at 0 degrees Celsius.
8. The vehicle of claim 7 wherein the controller is further configured to, responsive to indication of the ISG temperature exceeding a disabled threshold that is greater than an other percentage of the Curie temperature and less than the de-rated threshold, or the ISG temperature exceeding the de-rated threshold and a traction battery discharge power being less than a threshold, command the engine to start and shed a low-voltage load, and wherein the other percentage is associated with the PMFS having a value that is ¼ of the PMFS at 0 degrees Celsius.
9. The vehicle of claim 8 , wherein the controller is further configured to, responsive to indication of the ISG temperature dropping below the de-rated threshold and dropping below a first threshold, enable engine shut-off, and wherein the first threshold is less than the de-rated threshold and the de-rated threshold is less than the disable threshold.
10. The vehicle of claim 9 , wherein the controller is further configured to, responsive to indication of the ISG temperature dropping below the disable threshold, the de-rated threshold, and the first threshold, enable engine shut-off and permit enabling of the low-voltage load.
11. The vehicle of claim 10 , wherein the low-voltage load is a seat heater, a seat ventilator, a positive thermal coefficient heating element, or an air conditioner compressor.
12. The vehicle of claim 10 , wherein the ISG is a belt ISG.
13. A method of controlling a vehicle comprising:
by a controller,
responsive to receiving indication of a temperature of an integrated starter-generator (ISG) exceeding a de-rated threshold, commanding an engine coupled with the ISG to start and disabling engine shut-off;
responsive to receiving indication of the temperature exceeding a disable threshold, disabling a load; and
responsive to indication of the temperature dropping below the de-rated threshold and dropping below a first threshold, enabling engine shut-off, wherein the first threshold is less than the de-rated threshold and the de-rated threshold is less than the disable threshold.
14. The method of claim 13 , wherein the ISG is a belt ISG.
15. The method of claim 13 , wherein, responsive to indication of the temperature dropping below the disable threshold and the de-rated threshold, enabling automatic engine shut-off and permitting enabling of the load.