System, method, and apparatus for operating a high efficiency, high output transmission

Patent metadata

Field	Value
Publication number	US-12410861-B2
Application number	US-202318494142-A
Country	US
Kind code	B2
Filing date	Oct 25, 2023
Priority date	Dec 22, 2016
Publication date	Sep 9, 2025
Grant date	Sep 9, 2025

Abstract

A transmission includes an input shaft coupled to a prime mover, a countershaft, main shaft, and an output shaft, with gears between the countershaft and the main shaft. A shift actuator selectively couples the input shaft to the main shaft by rotatably coupling gears between the countershaft and the main shaft. The shift actuator is mounted on an exterior wall of a housing including the countershaft and the main shaft. A controller controls the shift actuator utilizing an actuating pulse and an opposing pulse.

First claim

What is claimed is:

1. A transmission, comprising:
an input shaft configured to couple to a prime mover;
a countershaft having a first plurality of gears mounted thereon;
a main shaft having a second plurality of gears mounted thereon;
an output shaft selectively providing a torque output to a driveline;
a shift actuator configured to selectively couple the input shaft to the main shaft by rotatably coupling at least one of the first plurality of gears to the countershaft and the second plurality of gears to the main shaft, wherein the shift actuator is mounted on an exterior wall of a housing, and wherein the countershaft and the main shaft are at least partially positioned within the housing;
a progressive actuator operationally coupled to an input clutch, wherein a progressive actuator position corresponds to a clutch position of the input clutch;
the input clutch configured to selectively decouple the prime mover from the input shaft; and
a clutch control logic configured to provide a lock-up time of the input clutch, the lock-up time comprising a time commencing with a clutch torque request time and ending with a clutch lock-up event, wherein during the lock-up time, the clutch control logic commands a position of the progressive actuator to maintain a clutch slip feedback value between a slip low threshold value and a slip high threshold value and the clutch lock-up event comprises a clutch slip value being lower than a clutch lock-up slip threshold value.

2. The transmission of claim 1 , wherein the clutch torque request time comprises at least one request condition selected from: a service brake pedal release event, a service brake pedal decrease event, a gear engagement request event, and a prime mover torque increase event.

3. The transmission of claim 2 , wherein the clutch control logic further comprises a clutch characterization logic that is configured to interpret a clutch torque profile, wherein the clutch torque profile provides a relation between the clutch position and a clutch torque value.

4. The transmission of claim 3 , wherein the clutch control logic comprises a launch characterization logic that is configured to interpret at least one launch parameter selected from a set of launch parameters consisting of: a vehicle grade value, a vehicle mass value; and a driveline configuration value.

5. The transmission of claim 4 , wherein the clutch control logic is further configured to command the position of the progressive actuator in response to the at least one launch parameter.

6. The transmission of claim 1 , wherein the clutch control logic is configured to control the progressive actuator position in response to a clutch torque reference value and a clutch torque profile.

7. The transmission of claim 6 , wherein the clutch characterization logic determines a clutch wear value and a clutch engagement response based at least in part on the clutch wear value.

8. The transmission of claim 1 , wherein the progressive actuator comprises at least one of the group consisting of a linear clutch actuator or a pneumatic actuator having a near-zero dead air volume.

9. A transmission, comprising:
an input shaft configured to couple to a prime mover;
a countershaft having a first plurality of gears mounted thereon;
a main shaft having a second plurality of gears mounted thereon;
an output shaft selectively providing a torque output to a driveline;
a shift actuator configured to selectively couple the input shaft to the main shaft by rotatably coupling at least one of the first plurality of gears to the countershaft and the second plurality of gears to the main shaft, wherein the shift actuator is mounted on an exterior wall of a housing, and wherein the countershaft and the main shaft are at least partially positioned within the housing;
an input clutch configured to selectively decouple the prime mover from the input shaft;
a progressive actuator operationally coupled to the input clutch, wherein a progressive actuator position corresponds to a clutch position;
a controller, comprising:
a clutch characterization logic configured to interpret a clutch torque profile of the input clutch, the clutch torque profile providing a relation between the clutch position and a clutch torque value; and
a clutch control logic configured to provide a lock-up time of the input clutch, the lock-up time comprising a time commencing with a clutch torque request time and ending with a clutch lock-up event, wherein the clutch lock-up event comprises a clutch slip value being lower than a clutch lock-up slip threshold value, wherein the clutch control logic is further configured to command a second progressive actuator position in response to a clutch torque reference value and the clutch torque profile; and
wherein the clutch characterization logic is further configured to:
interpret the second progressive actuator position and an indicated clutch torque; and

update the clutch torque profile in response to the second progressive actuator position and the indicated clutch torque.

10. The transmission of claim 9 , wherein the clutch torque request time comprises at least one request condition selected from: a service brake pedal release event, a service brake pedal decrease event, a gear engagement request event, and a prime mover torque increase event.

11. The transmission of claim 10 , wherein the clutch characterization logic determines a clutch wear value and a clutch engagement response based at least in part on the clutch wear value.

12. The transmission of claim 10 , wherein the clutch control logic further comprises a launch characterization logic that is configured to interpret at least one launch parameter selected from a set of launch parameters consisting of: a vehicle grade value; a vehicle mass value; and a driveline configuration value.

13. The transmission of claim 12 , wherein the clutch control logic is further configured to command the position of the progressive actuator in response to the at least one launch parameter.

14. The transmission of claim 9 , wherein the progressive actuator comprises at least one of the group consisting of a linear clutch actuator or a pneumatic actuator having a near-zero dead air volume.

Assignees

• Eaton Cummins Automated Trans Tech Llc

Inventors

• Connolly Thomas
• Furner Joseph Paul
• Chen Sipei
• Hawarden Jeff
• Mckenzie Ian Daniel
• Deboer Christopher

Classifications

• F16H61/0213

  characterised by the method for generating shift signals · CPC title

• F16H61/0021

  Generation or control of line pressure · CPC title

• F16H59/72

  dependent on oil characteristics, e.g. temperature, viscosity · CPC title

• F16H59/38

  of gearing elements · CPC title

• F16H3/091

  including a single countershaft · CPC title