IP Library › Granted Patent US 6,871,128
Granted Patent B2
US 6,871,128 · App. 10/121,690 · Granted Mar 22, 2005

Speed change control method and speed change controller

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Quick Facts
Patent No.
US 6,871,128
App. No.
10/121,690
Granted
Mar 22, 2005
Kind
B2
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 (17)

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.