Belt type continuously variable transmission and vehicle

• US 8,579,745 B2
• Filed: 01/14/2008
• Issued: 11/12/2013
• Est. Priority Date: 01/15/2007
• Status: Active Grant

• Current Assignee: Yamaha Hatsudoki Kabushiki Kaisha (Yamaha Corporation)
• Original Assignee: Yamaha Hatsudoki Kabushiki Kaisha (Yamaha Corporation)
• Inventors: Sakaue, Masaya
• Primary Examiner(s): Rivera, William A
• Assistant Examiner(s): LIU, HENRY Y
• Application Number:
  US12/013,914
• Publication Number:
  US 20080168831A1
• Time in Patent Office: 2,129 Days
• Field of Search: 474/8, 474/18, 474/28, 701 51- 68
• US Class Current: 474/8
• CPC Class Codes: F16H 2061/283 Adjustment or calibration of actuator positions, e.g. neutral position
• CPC Class Codes: F16H 61/66259 using electrical or electronical sensing or control means
• CPC Class Codes: F16H 63/062 electric or electro-mechanical actuating means

Abstract

A control device for a belt type continuously variable transmission of a vehicle such as a motorcycle includes a first storage section for storing in advance reference correlation between a position of a movable flange and a detection value of a flange position detection sensor. A first processing section moves the movable flange to a position where its movement is restricted by a restriction section. A detection value of the flange position detection sensor is stored in a second storage section. A second processing section derives correlation between the position of the movable flange and the detection value of the flange position detection sensor based on the detection value of the flange position detection sensor stored in the second storage section and the reference correlation between the position of the movable flange and the detection value of the flange position detection sensor stored in the first storage section. A detection value of the flange position detection sensor is thereby calibrated.

Claims

1. A belt type continuously variable transmission comprising:

a primary sheave and a secondary sheave each having a pair of flanges axially movable relative to each other, at least one of the flanges of the primary sheave being a movable flange;

a belt wound around the sheaves;

a flange position detection sensor for detecting a position of the movable flange;

a restriction section for restricting movement of the movable flange at one end of a movable range of the movable flange; and

a control device for controlling the position of the movable flange in a running mode based on a detection value of the flange position detection sensor, the control device including

a first storage section for storing in advance reference correlation between the position of the movable flange and the detection value of the flange position detection sensor,

a first processing section for moving the movable flange to a position in a check mode different from the running mode where movement of the movable flange is restricted by the restriction section, and for storing a detection value of the flange position detection sensor detected with the movable flange moved to that position in a second storage section, and

a second processing section in the check mode for deriving correlation between the position of the movable flange in the belt type continuously variable transmission and the detection value of the flange position detection sensor based on the detection value of the flange position detection sensor stored in the second storage section by the first processing section and the reference correlation between the position of the movable flange and the detection value of the flange position detection sensor stored in the first storage section.

2. The belt type continuously variable transmission according to claim 1, wherein

the first storage section stores a reference change amount of the detection value of the flange position detection sensor corresponding to movement of the movable flange from the one end to the other end of the movable range, and

the second processing section derives a detection value of the flange position detection sensor with the movable flange moved to the other end of the movable range by adding the reference change amount stored in the first processing section to the detection value caused to be stored in the second storage section by the first processing section.

3. The belt type continuously variable transmission according to claim 2, the control device comprising:

a third storage section for storing the detection value of the flange position detection sensor derived by the second processing section.

4. The belt type continuously variable transmission according to claim 3, the control device comprising:

a third processing section for detecting that the movable flange has moved to the other end of the movable range based on the detection value of the flange position detection sensor stored in the third storage section.

5. The belt type continuously variable transmission according to claim 1, wherein the first processing section determines that the movable flange has moved to the position where movement of the movable flange is restricted by the restriction section when there is no change in the detection value of the flange position detection sensor in a process to move the movable flange to the position where movement of the movable flange is restricted by the restriction section.

6. The belt type continuously variable transmission according to claim 1, wherein the restriction section defines the one end of the movable range of the movable flange on a side where a gear ratio of the belt type continuously variable transmission is LOW.

7. The belt type continuously variable transmission according to claim 6, the control device comprising:

a fourth processing section for moving the movable flange to a side where the gear ratio of the belt type continuously variable transmission is TOP to hold the belt between the pair of flanges of the primary sheave after a process performed by the first processing section to move the movable flange to the position where movement of the movable flange is restricted by the restriction section.

8. The belt type continuously variable transmission according to claim 1, the control device comprising:

a fourth storage section for storing a tolerable range of the detection value of the flange position detection sensor detected with the movable flange moved to the position where movement of the movable flange is restricted by the restriction section; and

a first abnormality detection section for detecting an abnormality when the detection value stored in the second storage section by the first processing section is outside the tolerable range stored in the fourth storage section.

9. The belt type continuously variable transmission according to claim 1, the control device comprising:

a second abnormality detection section for detecting an abnormality when the detection value of the flange position detection sensor keeps changing, in a process to move the movable flange to the position where movement of the movable flange is restricted by the restriction section, for a predetermined time or longer since the process was started.

10. The belt type continuously variable transmission according to claim 7, the control device comprising:

a third abnormality detection section for detecting an abnormality when the detection value of the flange position detection sensor keeps changing, in a process to move the movable flange to the side where the gear ratio of the belt type continuously variable transmission is TOP, for a predetermined time or longer since the process was started.

11. The belt type continuously variable transmission according to claim 1, the control device comprising:

a sensing section for sensing an abnormality of a mechanism for moving the movable flange or the flange position detection sensor; and

an abnormality sensing information storage section for storing information of the abnormality sensed by the sensing section, wherein the first processing section or the second processing section is enabled in a case where no information of a sensed abnormality is stored in the abnormality sensing information storage section.

12. The belt type continuously variable transmission according to claim 1, the control device comprising:

a control section for sending an operation signal to an electric motor for moving the movable flange;

a voltage sensor for sensing a voltage of a battery for supplying electricity to the electric motor;

a fifth storage section for storing a tolerable range of a value of the voltage sensed by the voltage sensor; and

a fourth abnormality detection section for detecting an abnormality when the battery voltage sensed by the voltage sensor is outside the tolerable range of the voltage value stored in the fifth storage section.

13. The belt type continuously variable transmission according to

claim 1, the control device comprising:

a correction section for correcting the reference correlation based on an actual detection value of the flange position detection sensor at a plurality of predetermined gear ratios.

14. The belt type continuously variable transmission according to claim 1, wherein:

the primary sheave also includes a fixed flange and the secondary sheave includes a fixed flange and a movable flange, each sheave being respectively mounted on a rotary shaft, and

the movable flange of the secondary sheave is urged in a direction of reducing a width of a groove of the secondary sheave, and the control device controls movement of the movable flange of the primary sheave so as to adjust the groove widths of the primary sheave and the secondary sheave.

15. The belt type continuously variable transmission according to claim 1, wherein the flange position detection sensor is an angle sensor mounted on a rotary shaft for rotation in conjunction with a mechanism for moving the movable flange.

16. A vehicle comprising the belt type continuously variable transmission according to claim 1.

17. The vehicle according to claim 1, wherein the vehicle is a motorcycle, a straddle type vehicle, a scooter type vehicle, a golf cart or a four-wheeled buggy.

18. A vehicle comprising the belt type continuously variable transmission according to claim 1, wherein the running mode is only executed during a driving operation of the vehicle, and the check mode is only executed during a non-driving operation of the vehicle.

19. A belt type continuously variable transmission comprising:

a primary sheave and a secondary sheave each having a pair of flanges axially movable relative to each to each other, at least one of the primary sheave being a movable flange;

a belt wound around the sheaves;

a flange position detection sensor for detecting a position of the movable flange;

a restriction section for restricting movement of the movable flange at one end of a movable range of the movable flange; and

a control device for controlling the position of the movable flange based on a detection value of the flange position detection sensor, the control device including

a first storage section for storing in advance reference correlation between the position of the movable flange and the detection value of the flange position detection sensor,

a first processing section for moving the movable flange to a position where movement of the movable flange is restricted by the restriction section, and for storing a detection value of the flange position detection sensor detected with the movable flange moved to that position in a second storage section,

a second processing section for deriving correlation between the position of the movable flange in the belt type continuously variable transmission and the detection value of the flange position detection sensor based on the detection value of the flange position detection sensor stored in the second storage section by the first processing section and the reference correlation between the position of the movable flange and the detection value of the flange position detection sensor stored in the first storage section, and

a correction section for correcting the detection value of the flange position detection sensor in the reference correlation based on a proportion of Δ

A/Δ

B when the gear ratio of the belt type continuously variable transmission has become a predetermined gear ratio, Δ

A being an actual change amount of the flange position detection sensor with reference to the position where movement of the movable flange is restricted by the restriction section, and Δ

B being a change amount of the flange position detection sensor calculated based on the reference correlation between the position of the movable flange and the detection value of the flange position detection sensor.

20. A control device for a belt type continuously variable transmission having

a primary sheave and a secondary sheave each having a pair of flanges axially movable relative to each other, at least one of the flanges of the primary sheave being a movable flange;

a belt wound around the sheaves;

a flange position detection sensor for detecting a position of the movable flange; and

a restriction section for restricting movement of the movable flange at one end of a movable range of the movable flange, the control device in a running mode controlling the position of the movable flange based on a detection value of the flange position detection sensor and including

a first storage section for storing in advance reference correlation between the position of the movable flange and the detection value of the flange position detection sensor,

a first processing section in a check mode different from the running mode for moving the movable flange to a position where movement of the movable flange is restricted by the restriction section, and for storing a detection value of the flange position detection sensor detected with the movable flange moved to that position in a second storage section, and

a second processing section in the check mode for deriving correlation between the position of the movable flange in the belt type continuously variable transmission and the detection value of the flange position detection sensor based on the detection value of the flange position detection sensor stored in the second storage section by the first processing section and the reference correlation between the position of the movable flange and the detection value of the flange position detection sensor stored in the first storage section.

21. A vehicle comprising the belt type continuously variable transmission according to claim 20, wherein the running mode is only executed during a driving operation of the vehicle, and the check mode is only executed during a non-driving operation of the vehicle.