Transmission controller

Patent metadata

Field	Value
Publication number	US-10520079-B2
Application number	US-201616082656-A
Country	US
Kind code	B2
Filing date	Mar 8, 2016
Priority date	Mar 8, 2016
Publication date	Dec 31, 2019
Grant date	Dec 31, 2019

Abstract

A transmission controller comprises an actuator which changes a roller position of a toroidal CVT to adjust the tilt motion angle of a power roller; a tilt motion angle information generation unit which generates information of the tilt motion angle; a position estimation unit which derives an estimated value of the roller position; and a position control unit which derives an operation command value of the actuator so that a deviation between a command value of the roller position and the estimated value of the roller position is cancelled. The position estimation unit is configured to derive the estimated value based on the information of the tilt motion angle which is generated by the tilt motion angle information generation unit, and the operation command value, and to compensate the estimated value based on an environment parameter which affects an operation of the power roller.

First claim

The invention claimed is:

1. A transmission controller which controls a transmission ratio of a toroidal continuously variable transmission which continuously changes the transmission ratio based on a tilt motion angle of a power roller, the transmission controller comprising:
an actuator which changes a roller position of the power roller to adjust the tilt motion angle;
a tilt motion angle information generation unit which generates information of the tilt motion angle;
a position estimation unit which derives an estimated value of the roller position; and
a position control unit which derives an operation command value of the actuator so that a deviation between a command value of the roller position and the estimated value of the roller position is cancelled,
wherein the position estimation unit is configured to derive the estimated value based on the information of the tilt motion angle which is generated by the tilt motion angle information generation unit, and the operation command value, and to compensate the estimated value based on an environment parameter which affects an operation of the power roller.

2. The transmission controller according to claim 1 ,
wherein the toroidal continuously variable transmission constitutes a part of a driving power transmission path which transmits driving power of an engine rotary shaft of an aircraft to an electric generator mounted in the aircraft, and
wherein the driving power transmission path does not include a path which bypasses the toroidal continuously variable transmission.

3. The transmission controller according to claim 2 ,
wherein the actuator is a hydraulic actuator, and
wherein the environment parameter includes a hydraulic oil temperature of the actuator.

4. The transmission controller according to claim 2 ,
wherein the toroidal continuously variable transmission includes a clamping mechanism which generates a clamping force for pushing the power roller against an input disc and an output disc, and
wherein the environment parameter includes the clamping force.

5. The transmission controller according to claim 2 ,
wherein the environment parameter includes an input rotation speed of the toroidal continuously variable transmission.

6. The transmission controller according to claim 2 ,
wherein the tilt motion angle information generation unit is constituted by an estimated angle estimation unit which generates an estimated value of the tilt motion angle as the information of the tilt motion angle, and
wherein the estimated angle estimation unit includes an actual transmission ratio calculation unit which derives an actual transmission ratio of the toroidal continuously variable transmission, and a converting unit which derives the estimated value of the tilt motion angle based on the actual transmission ratio derived by the actual transmission ratio calculation unit, with reference to a inverse function of the tilt motion angle with respect to the actual transmission ratio.

7. The transmission controller according to claim 1 ,
wherein the actuator is a hydraulic actuator, and
wherein the environment parameter includes a hydraulic oil temperature of the actuator.

8. The transmission controller according to claim 7 ,
wherein the toroidal continuously variable transmission includes a clamping mechanism which generates a clamping force for pushing the power roller against an input disc and an output disc, and
wherein the environment parameter includes the clamping force.

9. The transmission controller according to claim 7 ,
wherein the environment parameter includes an input rotation speed of the toroidal continuously variable transmission.

10. The transmission controller according to claim 7 ,
wherein the tilt motion angle information generation unit is constituted by an estimated angle estimation unit which generates an estimated value of the tilt motion angle as the information of the tilt motion angle, and
wherein the estimated angle estimation unit includes an actual transmission ratio calculation unit which derives an actual transmission ratio of the toroidal continuously variable transmission, and a converting unit which derives the estimated value of the tilt motion angle based on the actual transmission ratio derived by the actual transmission ratio calculation unit, with reference to a inverse function of the tilt motion angle with respect to the actual transmission ratio.

11. The transmission controller according to claim 1 ,
wherein the toroidal continuously variable transmission includes a clamping mechanism which generates a clamping force for pushing the power roller against an input disc and an output disc, and
wherein the environment parameter includes the clamping force.

12. The transmission controller according to claim 11 ,
wherein the environment parameter includes an input rotation speed of the toroidal continuously variable transmission.

13. The transmission controller according to claim 11 ,
wherein the tilt motion angle information generation unit is constituted by an estimated angle estimation unit which generates an estimated value of the tilt motion angle as the information of the tilt motion angle, and
wherein the estimated angle estimation unit includes an actual transmission ratio calculation unit which derives an actual transmission ratio of the toroidal continuously variable transmission, and a converting unit which derives the estimated value of the tilt motion angle based on the actual transmission ratio derived by the actual transmission ratio calculation unit, with reference to a inverse function of the tilt motion angle with respect to the actual transmission ratio.

14. The transmission controller according to claim 1 ,
wherein the environment parameter includes an input rotation speed of the toroidal continuously variable transmission.

15. The transmission controller according to claim 14 ,
wherein the tilt motion angle information generation unit is constituted by an estimated angle estimation unit which generates an estimated value of the tilt motion angle as the information of the tilt motion angle, and
wherein the estimated angle estimation unit includes an actual transmission ratio calculation unit which derives an actual transmission ratio of the toroidal continuously variable transmission, and a converting unit which derives the estimated value of the tilt motion angle based on the actual transmission ratio derived by the actual transmission ratio calculation unit, with reference to a inverse function of the tilt motion angle with respect to the actual transmission ratio.

16. The transmission controller according to claim 1 ,
wherein the tilt motion angle information generation unit is constituted by an estimated angle estimation unit which generates an estimated value of the tilt motion angle as the information of the tilt motion angle, and
wherein the estimated angle estimation unit includes an actual transmission ratio calculation unit which derives an actual transmission ratio of the toroidal continuously variable transmission, and a converting unit which derives the estimated value of the tilt motion angle based on the actual transmission ratio derived by the actual transmission ratio calculation unit, with reference to a inverse function of the tilt motion angle with respect to the actual transmission ratio.

Assignees

• Kawasaki Heavy Ind Ltd

Inventors

• Nakashima Kenichi
• Kohno Yukinobu
• Goi Tatsuhiko

Classifications

• B60W20/30

  Control strategies involving selection of transmission gear ratio {(control of change speed gearings, together with other vehicle sub-units B60W10/10; HEV transmission gearing B60K6/36; gearings and control thereof F16H)} · CPC title

• F16H61/0213

  characterised by the method for generating shift signals · CPC title

• F16H61/02

  characterised by the signals used · CPC title

• F16H59/44

  dependent on machine speed {, e.g. the vehicle speed} (F16H59/46 takes precedence) · CPC title

• B60W10/109

  of the toroïd type · CPC title