Speed change control method and speed change controller

• US 6,871,128 B2
• Filed: 04/15/2002
• Issued: 03/22/2005
• Est. Priority Date: 04/19/2001
• Status: Expired due to Term

• Current Assignee: Kawasaki Jukogyo Kabushiki Kaisha
• Original Assignee: Kawasaki Jukogyo Kabushiki Kaisha
• Inventors: Uenishi, Masaaki, Kawakami, Koji, Goi, Tatsuhiko, Nakashima, Kenichi, Kouno, Yukinobu
• Primary Examiner(s): Black, Thomas G.
• Assistant Examiner(s): MANCHO, RONNIE M
• Application Number:
  US10/121,690
• Publication Number:
  US 20020173403A1
• Time in Patent Office: 1,072 Days
• Field of Search: 701/51, 701/52, 475/198, 477/37, 477/107, 477/35, 192/3.51, 192/3.54, 476/67, 763/36
• US Class Current: 701/51
• CPC Class Codes: F16H 2037/088 Power split variators with summing differentials, with the input of the CVT connected or connectable to the input shaft
• CPC Class Codes: F16H 2059/704 Monitoring gear ratio in CVT's
• CPC Class Codes: F16H 37/086 CVT using two coaxial friction members cooperating with at least one intermediate friction member
• CPC Class Codes: F16H 61/6648 controlling of shifting being influenced by a signal derived from the engine and the main coupling

Abstract

A speed change control method of controlling a speed change ratio of a continuously variable transmission mechanism including a traction continuously variable transmission, includes: estimating a tilt angle of a power roller included in the continuously variable transmission based on an input rotating speed and an output rotating speed of the continuously-variable transmission mechanism;

estimating a position of the power roller based on an estimated tilt angle obtained by the tilt angle estimating step and a command signal given to a driving device of adjusting the tilt angle of the power roller; and executing a feedback control operation based on an estimated position of the power roller obtained by the position estimating step.

Claims

1. A speed change control method of controlling a speed change ratio of a continuously variable transmission mechanism including a traction continuously variable transmission, comprising:

estimating a tilt angle of a power roller included in the continuously variable transmission based on an input rotating speed and an output rotating speed of the continuously-variable transmission mechanism;

estimating a position of the power roller based on an estimated tilt angle obtained by the tilt angle estimating step and a command signal given to a driving device of adjusting the tilt angle of the power roller; and

executing a feedback control operation based on an estimated position of the power roller obtained by the position estimating step.

2. The speed change control method according to claim 1, wherein the speed change ratio of the continuously variable transmission mechanism is controlled so that the output rotating speed of the continuously variable transmission mechanism coincides with a predetermined rotating speed.

3. The speed change control method according to claim 2, wherein the position of the power roller is estimated by an observer constituted using the tilt angle and a model of the driving device.

4. The speed change control method according to claim 3, wherein the driving device includes a hydraulic cylinder actuator.

5. The speed change control method according to claim 1, wherein the position of the power roller is estimated by an observer constituted using the tilt angle and a model of the driving device.

6. The speed change control method according to claim 5, wherein the driving device includes a hydraulic cylinder actuator.

7. A speed change controller for controlling a speed change ratio of a continuously variable transmission mechanism including a traction continuously variable transmission, comprising:

a tilt angle estimating unit of estimating a tilt angle of a power roller included in the continuously variable transmission based on an input rotating speed and an output rotating speed of the continuously variable transmission mechanism; and

a power roller position estimating unit of estimating a position of the power roller based on an estimated tilt angle estimated by the tilt angle estimating unit and a command signal given to a driving device of adjusting the tilt angle of the power roller, the position of the power roller estimated by the power roller position estimating unit being used to execute a feed back control operation.

8. The speed change controller according to claim 7, wherein the speed change ratio of the continuously variable transmission mechanism is controlled so that the output rotating speed of the continuously variable transmission mechanism coincides with a predetermined rotating speed.

9. The speed change controller according to claim 8, wherein the power roller position estimating unit includes an observer constituted using the tilt angle and a model of the driving device.

10. The speed change controller according to claim 9, wherein the driving device includes a hydraulic cylinder actuator.

11. The speed change controller according to claim 7, wherein the power roller position estimating unit includes an observer constituted using the tilt angle and a model of the driving device.

12. The speed change controller according to claim 11, wherein the driving device includes a hydraulic cylinder actuator.