Power control system with transmission transient boost function

Patent metadata

Field	Value
Publication number	US-11351983-B2
Application number	US-201916670210-A
Country	US
Kind code	B2
Filing date	Oct 31, 2019
Priority date	Oct 31, 2019
Publication date	Jun 7, 2022
Grant date	Jun 7, 2022

Abstract

A control system includes a transmission with a directional clutch and control assembly clutches coupled together and configured for selective engagement to transfer power. A controller is configured to selectively actuate the directional clutch and the control assembly clutches with clutch commands to implement a first split mode in which combined power is transferred to drive the output shaft, a first direct drive mode in which power from only the engine to drive the output shaft, and a first series mode in which power is transferred from primarily the at least one motor to drive the output shaft. The controller is further configured to implement a transient boost function within at least a portion of the first series mode in which the at least one directional clutch is partially engaged to supplement power from the at least one motor with power from the engine to drive the output shaft.

First claim

What is claimed is:

1. A control system for operating a power train of a work vehicle having an engine and at least one motor configured to generate power for an output shaft, the control system comprising:
a transmission positioned operatively between the engine, the at least one motor, and the output shaft, the transmission comprising at least one directional clutch and a plurality of control assembly clutches coupled together and configured for selective engagement to transfer the power from the engine and the at least one motor to drive the output shaft according to a plurality of modes; and
a controller, having a processor and memory architecture, configured to selectively actuate the at least one directional clutch and the plurality of control assembly clutches with clutch commands to implement the plurality of modes, including
a first split mode in which the at least one directional clutch is fully engaged and at least one of the plurality of the control assembly clutches is fully engaged to transfer combined power from the engine and the at least one motor to drive the output shaft,
a first direct drive mode in which the at least one directional clutch is fully engaged and at least one of the plurality of the control assembly clutches is fully engaged to transfer power from only the engine to drive the output shaft, and
a first series mode in which at least one of the plurality of the control assembly clutches is fully engaged to transfer power from primarily the at least one motor to drive the output shaft,
the controller further configured to implement a transient boost function within at least a portion of the first series mode in which the at least one directional clutch is partially engaged to supplement power from the at least one motor with power from the engine to drive the output shaft.

2. The control system of claim 1 , wherein the controller is configured to implement the transient boost function immediately at an initiation of the first series mode for a partial duration of the first series mode.

3. The control system of claim 2 , wherein the controller is configured to terminate the transient boost function after the partial duration of the first series mode at which time the at least one directional clutch is fully disengaged.

4. The control system of claim 1 , wherein the controller is configured to implement the transient boost function at a time after an initiation of the first series mode and prior to an end of the first series mode at a duration that extends to the end of the first series mode.

5. The control system of claim 1 , wherein the controller is configured to implement the transient boost function at an initiation of the first series mode in which the at least one directional clutch is partially engaged, to terminate the transient boost function during an intermediate portion of the first series mode in which the at least one directional clutch is fully disengaged, and to implement the transient boost function at an end of the first series mode.

6. The control system of claim 1 , wherein the controller is configured to implement the transient boost function throughout the first series mode.

7. The control system of claim 1 , wherein, during implementation of the transient boost function, the controller generates the clutch commands such that a resultant clutch torque at the at least one directional clutch is less than 10%.

8. The control system of claim 1 , wherein, during implementation of the transient boost function, the controller generates the clutch commands such that a resultant clutch torque at the at least one directional clutch is less than 5%.

9. The control system of claim 1 , wherein, during implementation of the transient boost function, the controller generates the clutch commands for partial engagement of the at least one directional clutch for a duration of less than 1 second.

10. The control system of claim 1 ,
wherein the at least one directional clutch includes a forward directional clutch, the first split mode is a forward split mode in which the forward directional clutch is fully engaged and the at least one of the plurality of the control assembly clutches is fully engaged to transfer the combined power from the engine and the at least one motor to drive the output shaft in a forward direction, the first direct drive mode is a forward direct drive mode in which the forward directional clutch is fully engaged and the at least one of the plurality of the control assembly clutches is fully engaged to transfer power from only the engine to drive the output shaft in the forward direction, and the first series mode includes a forward series mode portion in which the at least one of the plurality of the control assembly clutches is fully engaged to transfer power from primarily the at least one motor to drive the output shaft in the forward direction, and
wherein the controller, during the transient boost function within the forward series mode portion, is configured to generate the clutch commands to partially engage the forward directional clutch.

11. The control system of claim 10 ,
wherein the at least one directional clutch further includes a reverse directional clutch,
wherein the plurality of modes implemented by controller includes a reverse split mode in which the reverse directional clutch is fully engaged and the at least one of the plurality of the control assembly clutches is fully engaged to transfer the combined power from the engine and the at least one motor to drive the output shaft in a reverse direction, and a reverse direct drive mode in which the reverse directional clutch is fully engaged and the at least one of the plurality of the control assembly clutches is fully engaged to transfer power from only the engine to drive the output shaft in the reverse direction, and wherein the first series mode includes a reverse series mode portion in which the at least one of the plurality of the control assembly clutches is fully engaged to transfer power from primarily the at least one motor to drive the output shaft in the reverse direction, and
wherein the controller, during the transient boost function within the reverse series mode portion, is configured to generate the clutch commands to partially engage the reverse directional clutch.

12. The control system of claim 11 ,
wherein the controller is configured to implement a shuttle shift in which the transmission transitions from the forward split mode, into the first series mode, and into the reverse split mode, and
wherein the controller is configured to implement the transient boost function during the forward series mode portion of the first series mode immediately after the forward split mode, and during the reverse series mode portion of the first series mode immediately before the reverse split mode.

13. The control system of claim 11 ,
wherein the controller is configured to implement a shuttle shift in which the transmission transitions from the reverse split mode, into the first series mode, and into the forward split mode, and
wherein the controller is configured to implement the transient boost function during the reverse series mode portion of the first series mode immediately after the reverse split mode, and during the forward series mode portion of the first series mode immediately before the forward split mode.

14. A work vehicle comprising:
an engine;
at least one continuously variable power source (CVP);
an output shaft;
a transmission positioned operatively between the engine, the at least one motor, and the output shaft, the transmission comprising at least one directional clutch and a

Assignees

• Deere & Co

Inventors

• Mckinzie Kyle K
• Janasek Clayton G
• Anderson Eric R

Classifications

• B60K6/445

  Differential gearing distribution type · CPC title

• B60K6/12

  by means of a chargeable fluidic accumulator · CPC title

• B60W10/02

  including control of driveline clutches · CPC title

• B60W10/06

  including control of combustion engines · CPC title

• B60K6/387

  Actuated clutches, i.e. clutches engaged or disengaged by electric, hydraulic or mechanical actuating means · CPC title