Vehicle electric machine control strategy

Patent metadata

Field	Value
Publication number	US-9714029-B2
Application number	US-201213601130-A
Country	US
Kind code	B2
Filing date	Aug 31, 2012
Priority date	Aug 31, 2012
Publication date	Jul 25, 2017
Grant date	Jul 25, 2017

Abstract

A vehicle includes at least one electric machine and an inverter for selectively transmitting power to the electric machine. The inverter includes a power module. At least one controller controls the electric machine and the inverter. The controller at least temporarily disables the inverter during a power cycle such that power to the electric machine is inhibited. In response to the disabling of the inverter, the controller resets the duty cycle commands for the power module, and re-enables the inverter during the same power cycle.

First claim

What is claimed is:

1. A vehicle comprising:
an electric motor/generator; and
at least one controller configured to, in response to a disabling of the electric motor/generator during a drive cycle, (i) reset duty cycle commands for the electric motor/generator and (ii) re-enable the electric motor/generator during the drive cycle within a predefined time period from the disabling of the electric motor/generator.

2. The vehicle of claim 1 , wherein the at least one controller is further configured to, in response to the electric motor/generator being disabled for a time period greater than the predefined time period, inhibit the electric motor/generator from being re-enabled during the drive cycle.

3. The vehicle of claim 2 further comprising another electric motor/generator, wherein the at least one controller is further configured to increase a power to the another electric motor/generator in response to the disabling of the electric motor/generator.

4. The vehicle of claim 2 further comprising an engine, wherein the at least one controller is further configured to start the engine in response to the electric motor/generator being disabled for a time period greater than the predefined time period.

5. The vehicle of claim 1 , wherein the predefined time period is approximately 1 second.

6. A method of controlling an electric motor/generator in a vehicle comprising:
disabling the electric motor/generator during a drive cycle of the vehicle in response to detecting a presence of a fault condition associated with the electric motor/generator; and
re-enabling the electric motor/generator during the drive cycle within a predefined time period from the disabling of the electric motor/generator in response to detecting an absence of the fault condition.

7. The method of claim 6 further comprising, prior to the re-enabling of the electric motor/generator, resetting duty cycle commands for the electric motor/generator.

8. The method of claim 6 further comprising preventing the re-enabling of the electric motor/generator during the drive cycle in response to the electric motor/generator being disabled for a time period greater than the predefined time period.

9. The method of claim 6 , wherein the fault condition is indicative of a temperature of an inverter operatively arranged with the electric motor/generator being greater than a threshold temperature.

10. The method of claim 6 , wherein the fault condition is indicative of a voltage of an inverter operatively arranged with the electric motor/generator being greater than a threshold voltage.

11. The method of claim 6 , wherein the predefined time period is approximately 1 second.

12. A method of controlling an electric motor/generator in a vehicle comprising:
disabling the electric motor/generator during a drive cycle of the vehicle in response to detecting a presence of a fault condition associated with the electric motor/generator;
resetting duty cycle commands for the electric motor/generator; and
re-enabling the electric motor/generator during the drive cycle in response to detecting an absence of the fault condition.

13. The method of claim 12 , wherein the fault condition is indicative of a temperature of an inverter operatively arranged with the electric motor/generator being greater than a threshold temperature.

14. The method of claim 12 , wherein the fault condition is indicative of a voltage of an inverter operatively arranged with the electric motor/generator being greater than a threshold voltage.

Assignees

• Isayeva Rimma
• Reynolds William
• Butcher Jonathan Andrew
• Ford Global Tech Llc

Inventors

• Isayeva Rimma
• Reynolds William
• Butcher Jonathan Andrew

Classifications

• B60W20/50 Primary

  Control strategies for responding to system failures, e.g. for fault diagnosis, failsafe operation or limp mode · CPC title

• Y10S903/903

  having energy storing means, e.g. battery, capacitor · CPC title

• B60W50/035 Primary

  Bringing the control units into a predefined state, e.g. giving priority to particular actuators · CPC title

• B60W2050/0297

  Control Giving priority to different actuators or systems · CPC title