Controller of continuously variable transmission and vehicle provided with the same

• US 20070027602A1
• Filed: 07/14/2006
• Published: 02/01/2007
• Est. Priority Date: 07/15/2005
• Status: Active Grant

• Current Assignee: Yamaha Hatsudoki Kabushiki Kaisha (Yamaha Corporation)
• Original Assignee: Yamaha Hatsudoki Kabushiki Kaisha (Yamaha Corporation), Yamaha Motor Company Limited (Yamaha Corporation)
• Inventors: Ishioka, Kazutoshi, Unno, Toshio
• Granted Patent: US 9,097,343 B2
• Time in Patent Office: Days
• US Class Current: 701/51
• CPC Class Codes: F16H 61/66254 controlling of shifting being influenced by a signal derived from the engine and the main coupling
• CPC Class Codes: F16H 61/66259 using electrical or electronical sensing or control means

Abstract

A controller of a continuously variable transmission makes sufficient use of the essential engine performance of a motorcycle or the like. A speed change ratio controller, which controls a speed change ratio of the continuously variable transmission, normally exercises map control according to a predetermined speed change ratio map so that a V-N characteristic curve prescribed by a vehicle speed (V) and an engine rotational frequency (N) falls in a range of a predetermined region of speed change. When an accelerator opening degree exceeds a predetermined range and a vehicle load exceeds a predetermined range a target speed change ratio is corrected so that the V-N characteristic curve gets out of the predetermined region of speed change. After the V-N characteristic curve gets out of the region of speed change, the necessity of continuation of acceleration or deceleration is determined on the basis of a predetermined condition such as returning of an accelerator grip, and when the continuation is unnecessary, normal map control is automatically restored.

Claims

1. A controller of a continuously variable transmission mounted on a vehicle, which includes an engine and an accelerator manipulating element manipulated by hand, the controller comprising

an accelerator manipulated variable detector that detects a manipulated variable of the accelerator manipulating element, and

a speed change ratio controller that sets a target speed change ratio of the continuously variable transmission on the basis of a manipulated variable of the accelerator manipulating element and controls the continuously variable transmission so that a speed change ratio becomes the target speed change ratio, and

wherein the speed change ratio controller comprises

a standard speed change ratio setting unit that sets a target speed change ratio so that V-N characteristics prescribed by a vehicle speed and an engine rotational frequency falls in a predetermined region of speed change, when a manipulated variable of the accelerator manipulating element is in a predetermined standard range,

a specific speed change ratio setting unit that sets a target speed change ratio so that the V-N characteristics get out of the predetermined region of speed change, when a manipulated variable of the accelerator manipulating element exceeds the standard range, and

an automatic return unit that resets a target speed change ratio so that the V-N characteristics having gotten out of the predetermined region of speed return to the region of speed change.

4. The controller of a continuously variable transmission, according to claim 1, wherein the speed change ratio controller comprises a storage unit, which stores predetermined speed change ratio information,

the standard speed change ratio setting unit sets a target speed change ratio according to the speed change ratio information, and

the specific speed change ratio setting unit calculates a correction for the target speed change ratio, which is set by the standard speed change ratio setting unit, on the basis of a manipulated variable of the accelerator manipulating element and sets a value, which is obtained by correcting the target speed change ratio on the basis of the correction, as a new target speed change ratio when a manipulated variable of the accelerator manipulating element exceeds the standard range.

8. The controller of a continuously variable transmission, according to claim 1, wherein the automatic return unit begins resetting of the speed change ratio when a manipulated variable of the accelerator manipulating element becomes equal to or less than a predetermined amount after the vehicle accelerates and the V-N characteristics get out of the predetermined region of speed change.

9. The controller of a continuously variable transmission, according to claim 1, wherein the automatic return unit begins resetting of the speed change ratio when a decrease in a manipulated variable of the accelerator manipulating element becomes equal to or more than a predetermined amount after the vehicle accelerates and the V-N characteristics get out of the predetermined region of speed change.

10. The controller of a continuously variable transmission, according to claim 1, wherein the automatic return unit begins resetting of the speed change ratio when a manipulated variable of the accelerator manipulating element becomes equal to or more than a predetermined amount after the vehicle decelerates and the V-N characteristics get out of the predetermined region of speed change.

11. The controller of a continuously variable transmission, according to claim 1, wherein the automatic return unit begins resetting of the speed change ratio when an increase in a manipulated variable of the accelerator manipulating element becomes equal to or more than a predetermined amount after the vehicle decelerates and the V-N characteristics get out of the predetermined region of speed change.

12. The controller of a continuously variable transmission, according to claim 1, further comprising an acceleration detector that detects acceleration of the vehicle, and

wherein the automatic return unit begins resetting of the speed change ratio when the acceleration becomes equal to or less than a predetermined value due to a driver'"'"'s manipulation after the vehicle accelerates and the V-N characteristics get out of the predetermined region of speed change.

13. The controller of a continuously variable transmission, according to claim 1, further comprising an acceleration detector that detects acceleration of the vehicle, and

wherein the automatic return unit begins resetting of the speed change ratio when a decrease in the acceleration becomes equal to or more than a predetermined amount due to a driver'"'"'s manipulation after the vehicle accelerates and the V-N characteristics get out of the predetermined region of speed change.

14. The controller of a continuously variable transmission, according to claim 1, further comprising an acceleration detector that detects acceleration of the vehicle, and

wherein the automatic return unit begins resetting of the speed change ratio when the acceleration becomes equal to or more than a predetermined value after the vehicle accelerates and the V-N characteristics get out of the predetermined region of speed change.

15. The controller of a continuously variable transmission, according to claim 1, further comprising a vehicle speed detector that detects a travel speed of the vehicle, and

wherein the automatic return unit begins resetting of the speed change ratio when the travel speed becomes equal to or less than a predetermined value due to a driver'"'"'s manipulation after the vehicle accelerates and the V-N characteristics get out of the predetermined region of speed change.

16. The controller of a continuously variable transmission, according to claim 1, further comprising a vehicle speed detector that detects a travel speed of the vehicle, and

wherein the automatic return unit begins resetting of the speed change ratio when a decrease in the travel speed becomes equal to or more than a predetermined value due to a driver'"'"'s manipulation after the vehicle accelerates and the V-N characteristics get out of the predetermined region of speed change.

17. The controller of a continuously variable transmission, according to claim 1, further comprising a vehicle speed detector that detects a travel speed of the vehicle, and

wherein the automatic return unit begins resetting of the speed change ratio when the travel speed becomes equal to or more than a predetermined value after the vehicle accelerates and the V-N characteristics get out of the predetermined region of speed change.

18. The controller of a continuously variable transmission, according to claim 1, further comprising a vehicle speed detector that detects a travel speed of the vehicle, and

wherein the automatic return unit begins resetting of the speed change ratio when the travel speed becomes equal to or more than a predetermined value due to a driver'"'"'s manipulation after the vehicle decelerates and the V-N characteristics get out of the predetermined region of speed change.

19. The controller of a continuously variable transmission, according to claim 1, further comprising a vehicle speed detector that detects a travel speed of the vehicle, and

wherein the automatic return unit begins resetting of the speed change ratio when an increase in the travel speed becomes equal to or more than a predetermined amount due to a driver'"'"'s manipulation after the vehicle decelerates and the V-N characteristics get out of the predetermined region of speed change.

20. The controller of a continuously variable transmission, according to claim 1, further comprising a vehicle speed detector that detects a travel speed of the vehicle, and

wherein the automatic return unit begins resetting of the speed change ratio when the travel speed becomes equal to or less than a predetermined value after the vehicle decelerates and the V-N characteristics get out of the region of speed change.

21. The controller of a continuously variable transmission, according to claim 1, further comprising an engine rotational frequency detector that detects a rotational frequency of the engine, and

wherein the automatic return unit begins resetting of the speed change ratio when an engine rotational frequency becomes equal to or less than a predetermined value due to a driver'"'"'s manipulation after the vehicle accelerates or decelerates and the V-N characteristics get out of the predetermined region of speed change.

22. The controller of a continuously variable transmission, according to claim 1, further comprising an engine rotational frequency detector that detects a rotational frequency of the engine, and

wherein the automatic return unit begins resetting of the speed change ratio when a decrease in engine rotational frequency becomes equal to or more than a predetermined amount due to a driver'"'"'s manipulation after the vehicle accelerates or decelerates and the V-N characteristics get out of the predetermined region of speed change.

23. The controller of a continuously variable transmission, according to claim 1, further comprising an engine rotational frequency detector that detects a rotational frequency of the engine, and

wherein the automatic return unit begins resetting of the speed change ratio when an engine rotational frequency becomes equal to or more than a predetermined value after the vehicle accelerates or decelerates and the V-N characteristics get out of the predetermined region of speed change.

24. The controller of a continuously variable transmission, according to claim 1, further comprising a timer capable of measuring an elapsed time, and

wherein the automatic return unit begins resetting of the speed change ratio when a predetermined time elapses after the V-N characteristics get out of the predetermined region of speed change.

25. The controller of a continuously variable transmission, according to claim 1, wherein when a manipulated variable of the accelerator manipulating element becomes equal to or more than a predetermined amount in a state, in which a vehicle stops, the specific speed change ratio setting unit sets a target speed change ratio so that the V-N characteristics get out of the predetermined region of speed change.

27. A vehicle comprising an engine and an accelerator manipulating element, and provided with the controller of a continuously variable transmission, according to claim 1.

2. A controller of a continuously variable transmission mounted on a vehicle, which includes an engine and an accelerator manipulating element manipulated by hand, the controller comprising

a load detector that detects a load on the vehicle, and

a speed change ratio controller that sets a target speed change ratio of the continuously variable transmission on the basis of the load on the vehicle and controls the continuously variable transmission so that a speed change ratio becomes the target speed change ratio, and

wherein the speed change ratio controller comprises

a standard speed change ratio setting unit that sets a target speed change ratio so that V-N characteristics prescribed by a vehicle speed and an engine rotational frequency falls in a predetermined region of speed change, when the load on the vehicle is in a predetermined standard range,

a specific speed change ratio setting unit that sets a target speed change ratio so that the V-N characteristics get out of the predetermined region of speed change, when the load on the vehicle exceeds the standard range, and

an automatic return unit that resets a target speed change ratio so that the V-N characteristics having gotten out of the predetermined region of speed return to the predetermined region of speed change.

5. The controller of a continuously variable transmission, according to claim 2, wherein the speed change ratio controller comprises a storage unit, which stores predetermined speed change ratio information,

the standard speed change ratio setting unit sets a target speed change ratio according to the speed change ratio information, and

the specific speed change ratio setting unit calculates a correction for the target speed change ratio, which is set by the standard speed change ratio setting unit, on the basis of the load on the vehicle and sets a value, which is obtained by correcting the target speed change ratio on the basis of the correction, as a new target speed change ratio when the load on the vehicle exceeds the standard range.

26. The controller of a continuously variable transmission, according to claim 2, wherein when a load on a vehicle becomes equal to or more than a predetermined value in a state, in which a vehicle travels, the specific speed change ratio setting unit sets a target speed change ratio so that the V-N characteristics get out of the predetermined region of speed change.

3. A controller of a continuously variable transmission mounted on a vehicle, which includes an engine and an accelerator manipulating element manipulated by hand, the controller comprising

an accelerator manipulated variable detector that detects a manipulated variable of the accelerator manipulating element,

a load detector that detects a load on the vehicle, and

a speed change ratio controller that sets a target speed change ratio of the continuously variable transmission on the basis of a manipulated variable of the accelerator manipulating element and the load on the vehicle and controls the continuously variable transmission so that a speed change ratio becomes the target speed change ratio, and

wherein the speed change ratio controller comprises

a standard speed change ratio setting unit that sets a target speed change ratio so that the V-N characteristics prescribed by a vehicle speed and an engine rotational frequency falls in a predetermined region of speed change, when a manipulated variable of the accelerator manipulating element or the load on the vehicle is in a predetermined standard range,

a specific speed change ratio setting unit that sets a target speed change ratio so that the V-N characteristics get out of the predetermined region of speed change, when a manipulated variable of the accelerator manipulating element and the load on the vehicle exceed the standard ranges, and

an automatic return unit that resets a target speed change ratio so that the V-N characteristics having gotten out of the predetermined region of speed return to the predetermined region of speed change.

6. The controller of a continuously variable transmission, according to claim 3, wherein the speed change ratio controller comprises a storage unit, which stores predetermined speed change ratio information,

the standard speed change ratio setting unit sets a target speed change ratio according to the speed change ratio information, and

the specific speed change ratio setting unit calculates a correction for the target speed change ratio, which is set by the standard speed change ratio setting unit, on the basis of a manipulated variable of the accelerator manipulating element and the load on the vehicle and sets a value, which is obtained by correcting the target speed change ratio on the basis of the correction, as a new target speed change ratio when a manipulated variable of the accelerator manipulating element and the load on the vehicle exceed the standard ranges.

7. The controller of a continuously variable transmission, according to claim 3, wherein the continuously variable transmission comprises a primary sheave, a secondary sheave, and a transmission belt wound around the primary sheave and the secondary sheave, and

further comprising a vehicle speed detector that detects a travel speed of the vehicle,

an engine rotational frequency detector that detects a rotational frequency of the engine, and

a secondary sheave rotational frequency detector that detects a rotational frequency of the secondary sheave, and

wherein the speed change ratio controller comprises a storage unit, which stores predetermined speed change ratio information,

the standard speed change ratio setting unit sets a target speed change ratio according to the speed change ratio information on the basis of a manipulated variable of the accelerator manipulating element and the travel speed, and

the specific speed change ratio setting unit calculates a correction for the target speed change ratio, which is set by the standard speed change ratio setting unit, on the basis of a manipulated variable of the accelerator manipulating element, the travel speed, the engine rotational frequency, and the secondary sheave rotational frequency and sets a value, which is obtained by correcting the target speed change ratio on the basis of the correction, as a new target speed change ratio when a manipulated variable of the accelerator manipulating element and the load on the vehicle exceed the standard ranges.