Engine operation based on integrated starter-generator temperature

Patent metadata

Field	Value
Publication number	US-10519917-B2
Application number	US-201715496475-A
Country	US
Kind code	B2
Filing date	Apr 25, 2017
Priority date	Apr 25, 2017
Publication date	Dec 31, 2019
Grant date	Dec 31, 2019

Abstract

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.

First claim

What is claimed is:

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.

Assignees

• Ford Global Tech Llc

Inventors

• Lee Josephine S
• Shields Mark
• Farahmand Sassan
• Hartmann Bastian
• Bryan Paul Stephen
• Zamora Joseph Andrew

Classifications

• F02N2300/104

  Control of the starter motor torque · CPC title

• F02N11/04 Primary

  the motors being associated with current generators · CPC title

• B60W2510/0676

  Engine temperature · CPC title

• B60W2710/248

  Current for loading or unloading · CPC title

• B60W20/11

  using model predictive control [MPC] strategies, i.e. control methods based on models predicting performance {(utilising navigation and traffic information in the control strategy B60W20/12)} · CPC title