Granted Patent B2

US 8,849,489 · App. 13/531,907 · Granted Sep 30, 2014

Abstract

Claims (45)

1. A method of controlling first and second electric motors of a vehicle having an electrically variable transmission during a transmission shift operation, said method comprising using a processor to perform the steps of:

determining whether a type of shift being performed is (1) a clutch-to-clutch shift with input torque control, (2) a clutch-to-clutch shift with first and second motor torque and battery power control or (3) a synchronous shift with first and second motor torque and battery power control;

determining if a first clutch is being applied or released during the transmission shift operation;

determining if a second clutch is being applied or released during the transmission shift operation;

determining an acceleration limit based on the type of shift being performed and which of the first and the second clutch is being applied and/or released;

determining acceleration and speed profiles based on the type of shift being performed, which of the first and the second clutch is being applied and/or released and the acceleration limit;

determining a first electric motor torque and a second electric motor torque based on the acceleration and speed profiles;

setting a torque of the first electric motor to the determined first electric motor torque;

setting a torque of the second electric motor to the determined second electric motor torque;

determining a first clutch torque and a second clutch torque based on the acceleration and speed profiles;

setting a torque of the first clutch to the determined first clutch torque; and

setting a torque of the second clutch to the determined second clutch torque.

2. The method of claim 1 , further comprising:

determining an engine torque based on the acceleration and speed profiles; and

setting a torque of the engine to the determined engine torque.

3. The method of claim 1 , wherein the determined acceleration limit is an input acceleration limit and the determined acceleration and speed profiles are desired main planetary carrier acceleration and speed profiles and desired input acceleration and speed profiles.

4. The method of claim 1 , further comprising determining an optimum input torque, wherein determining the first electric motor torque and the second electric motor torque is also based on the determined optimum torque.

5. The method of claim 1 , wherein the determined acceleration limit is a main planetary carrier acceleration limit and the determined acceleration and speed profiles are desired main planetary carrier acceleration and speed profiles.

6. The method of claim 1 , further comprising:

setting a torque of the first clutch to zero; and

setting a torque of the second clutch to zero.

7. The method of claim 6 , wherein the determined acceleration limit is a main planetary carrier acceleration limit and the determined acceleration and speed profiles are desired main planetary carrier acceleration and speed profiles.

8. A controller for controlling first and second electric motors of a vehicle having an electrically variable transmission during a transmission shift operation, said controller comprising:

a processor programmed to:

determine whether a type of shift being performed is (1) a clutch-to-clutch shift with input torque control, (2) a clutch-to-clutch shift with first and second motor torque and battery power control or (3) a synchronous shift with first and second motor torque and battery power control;

determine if a first clutch is being applied or released during the transmission shift operation;

determine if a second clutch is being applied or released during the transmission shift operation;

determine an acceleration limit based on the type of shift being performed and which of the first and the second clutch is being applied and/or released;

determine acceleration and speed profiles based on the type of shift being performed, which of the first and the second clutch is being applied and/or released and the acceleration limit;

determine a first electric motor torque and a second electric motor torque based on the acceleration and speed profiles;

set a torque of the first electric motor to the determined first electric motor torque;

set a torque of the second electric motor to the determined second electric motor torque;

determine a first clutch torque and a second clutch torque based on the acceleration and speed profiles;

set a torque of the first clutch to the determined first clutch torque; and

set a torque of the second clutch to the determined second clutch torque.

9. The controller of claim 8 , wherein the processor is further programmed to:

determine an engine torque based on the acceleration and speed profiles; and

set a torque of the engine to the determined engine torque.

10. The controller of claim 8 , wherein the determined acceleration limit is an input acceleration limit and the determined acceleration and speed profiles are desired main planetary carrier acceleration and speed profiles and desired input acceleration and speed profiles.

11. The controller of claim 8 , wherein the processor is further programmed to determine an optimum input torque, wherein the processor determines the first electric motor torque and the second electric motor torque also based on the determined optimum torque.

12. The controller of claim 8 , wherein the determined acceleration limit is a main planetary carrier acceleration limit and the determined acceleration and speed profiles are desired main planetary carrier acceleration and speed profiles.

13. The controller of claim 8 , wherein if the type of shift being performed is the synchronous shift with first and second motor torque and battery power control, the processor is further programmed to:

set a torque of the first clutch to zero; and

set a torque of the second clutch to zero.

14. The controller of claim 13 , wherein the determined acceleration limit is a main planetary carrier acceleration limit and the determined acceleration and speed profiles are desired main planetary carrier acceleration and speed profiles.

Assignments (8)