Torque error detection and torque estimation system

Patent metadata

Field	Value
Publication number	US-9448135-B2
Application number	US-201414332893-A
Country	US
Kind code	B2
Filing date	Jul 16, 2014
Priority date	Jul 16, 2014
Publication date	Sep 20, 2016
Grant date	Sep 20, 2016

Abstract

A vehicle may include a powertrain having an engine and a generator coupled to a driveshaft, an inverter configured to provide phase currents to the generator, and a controller programmed to output a fault condition based on first and second generator torques, the first generator torque being based on an engine torque and the second generator torque being based on no more than two phase currents of the generator.

First claim

What is claimed is:

1. A vehicle comprising:
a powertrain including an engine and a generator coupled to a driveshaft;
an inverter configured to provide phase currents to the generator; and
a controller programmed to output a fault condition based on first and second generator torques, the first generator torque being based on an engine torque and the second generator torque being based on no more than two phase currents of the generator.

2. The vehicle of claim 1 , wherein the controller is further programmed to identify a fault condition in response to a difference between the first generator torque and the second generator torque exceeding an error threshold.

3. The vehicle of claim 1 , wherein the first generator torque is further based on a motor acceleration and a generator acceleration.

4. The vehicle of claim 3 , wherein the engine torque is estimated in the controller.

5. The vehicle of claim 1 , wherein the second generator torque is further based on a generator magnetic flux and a generator drag torque.

6. A torque error detection system comprising:
a controller including input communication channels configured to receive an engine torque and no more than two phase currents of a generator, output communication channels configured to output a fault condition, and control logic configured to generate the fault condition in response to a difference between first and second generator torques exceeding a threshold, wherein the first generator torque is based on the engine torque and the second generator torque is based on the two currents.

7. The system of claim 6 , wherein the first generator torque is further based on a motor acceleration and a generator acceleration.

8. The system of claim 7 , wherein the engine torque is estimated in the controller.

9. The system of claim 6 , wherein the second generator torque is further based on a generator magnetic flux and a generator drag torque.

10. A method for detecting generator torque error comprising:
outputting a fault condition in response to a difference between first and second generator torques exceeding a threshold, wherein the first torque is based on a steady state engine torque, an engine acceleration, and a generator acceleration, and wherein the second torque is based on generator phase currents.

11. The method of claim 10 , wherein the second torque is based on no more than two generator phase currents.

12. The method of claim 11 , wherein the second torque is further based on a generator magnetic flux and a generator drag torque.

13. The method of claim 10 , further comprising estimating a steady state generator torque based on the steady state engine torque and a sun to carrier gear ratio of a planetary gear set.

14. The method of claim 10 , further comprising filtering the generator acceleration and the motor acceleration, wherein the engine acceleration is based on the filtered generator acceleration and a sun to carrier gear ratio of a planetary gear set plus the filtered motor acceleration and a motor to ring gear ratio and a ring to carrier gear ratio of the planetary gear set.

15. The method of claim 14 , wherein the first torque is further based on a generator inertial torque based on the filtered generator acceleration.

16. The method of claim 15 , wherein the first torque is further based on an engine inertial torque based on the engine acceleration.

Assignees

• Ford Global Tech Llc

Inventors

• Syed Fazal Urrahman
• Luedtke Daniel Richard
• Badreddine Bader M
• Cikanek Susan Rebecca

Classifications

• B60W20/50 Primary

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

• B60L3/12

  Recording operating variables {; Monitoring of operating variables} · CPC title

• G01L3/109

  involving measuring phase difference of two signals or pulse trains · CPC title

• G01M15/042 Primary

  by monitoring a single specific parameter not covered by groups G01M15/06 - G01M15/12 · CPC title

• B60L3/0061

  relating to electrical machines · CPC title