Drive device
AssigneeDenso Corporation
InventorDaisuke NAKANISHI
Life of this patent
Estimating the term…
Abstract
A drive device includes: an actuator rotating, around a rotation axis, a shift drum having a lead groove formed on an outer peripheral surface; and an angle correction unit correcting a detection value of a rotation angle sensor that detects a rotation angle of the shift drum. The angle correction unit calculates the rotation angle of the shift drum at a reference position as a learning angle based on a correspondence between a displacement amount of a first engaging portion and a change amount of the rotation angle of the shift drum per a predetermined time of rotation of the shift drum at a predetermined speed. Then, the angle correction unit corrects the detection value of the rotation angle sensor based on an amount of deviation between the learning angle and a design angle.
Claims12
A drive device for driving a clutch capable of switching between (i) an engaged state in which a pair of engaging portions rotate integrally and (ii) a disengaged state in which the pair of engaging portions do not rotate integrally, the drive device comprising:
- an actuator rotating a shift drum having a lead groove formed on an outer peripheral surface around a predetermined rotating shaft;
- and
- an angle correction unit correcting a detection value of a rotation angle sensor that detects a rotation angle of the shift drum, wherein
- one of the pair of engaging portions is connected to the shift drum via a shift fork having an engagement pin that engages with the lead groove,
- the shift fork engages and disengages the clutch by displacement in an axial direction of the rotating shaft according to a shape of the lead groove,
- the lead groove includes (a) a slope groove portion that is inclined with respect to the axial direction and displaces the one of the engaging portions in the axial direction, and (b) a flat groove portion that stops the axial displacement of the one of the engaging portions, which is connected to the slope groove portion,
- assuming that (A) a position of the one of the engaging portions when the engagement pin is at a connection point between the slope groove portion and the flat groove portion is used as a reference position, and (B) a rotation angle of the shift drum when the engagement pin is at the connection point is used as a design angle,
- the angle correction unit
- calculates the rotation angle of the shift drum at the reference position as a learning angle based on a correspondence between (a) the displacement amount of the one of the engaging portions and (b) the change amount of the rotation angle of the shift drum per predetermined time of rotation of the shift drum at a predetermined speed, and
- corrects the detection value of the rotation angle sensor so that the amount of deviation between the learning angle and the design angle becomes small.
A drive device for driving a clutch, wherein the clutch is configured to switch between (i) an engaged state in which a pair of engaging portions rotate integrally and (ii) a disengaged state in which the pair of engaging portions do not rotate integrally, the drive device comprising:
- an actuator rotating a shift drum including a lead groove formed on an outer peripheral surface around a rotating axis;
- and
- an angle correction unit configured to correct a detection value of a rotation angle sensor that detects a rotation angle of the shift drum, wherein
- the pair of engaging portions includes a mobile engaging portion and a fixed engaging portion, and the mobile engaging portion is connected to the shift drum via a shift fork including an engagement pin that engages with the lead groove,
- the shift fork engages and disengages the clutch by displacement in an axial direction according to a shape of the lead groove as the shift drum rotates,
- the lead groove includes:
- (a) a slope groove portion that is inclined with respect to the axial direction and displaces the mobile engaging portion in the axial direction, and (b) a flat groove portion that stops the axial displacement of the mobile engaging portion, which is connected to the slope groove portion,
- a connection point in the lead groove defines a reference position, and is located where the slope groove portion meets the flat groove portion,
- a rotation angle of the shift drum when the engagement pin is at the connection point is defined as a design angle, and
- the angle correction unit:
- (i) calculates the rotation angle of the shift drum at or near the reference position as a learning angle based on a correspondence between (a) a measured displacement amount of the mobile engaging portion and (b) a measured change amount of the rotation angle of the shift drum corresponding to the measured displacement amount of the mobile engaging portion, wherein measurements are made based on a predetermined time of rotation of the shift drum at a predetermined speed in a region of the slope groove portion near the reference position, and
- (ii) corrects the detection value of the rotation angle sensor based on an amount of deviation between the learning angle and the design angle.
A drive device comprising:
- at least one processor;
- and
- a non-transitory computer-readable storage medium,
- wherein the drive device is configured to control a clutch,
- wherein the clutch includes:
- (i) a shift drum, wherein the shift drum is configured to rotate about a rotational axis, wherein the shift drum includes a lead groove, and wherein the lead groove includes a disengaged flat groove portion and a first slope groove portion,
- (ii) a shift fork including an engagement pin configured to penetrate the lead groove, configured to move within the lead groove when the shift drum rotates, and configured to move vertically when the engagement pin moves within the first slope groove portion while the shift drum rotates,
- (iii) a mobile engaging portion attached directly or indirectly to the shift fork, such that the mobile engaging portion tends to move vertically when the shift fork moves vertically,
- (iv) a static engaging portion configured to receive and to be rotated by the mobile engaging portion,
- (v) a rotation angle sensor configured to measure a rotation angle of the shift drum, wherein a reference angle is defined by a connection point where the disengaged flat groove portion meets the first slope groove portion under design conditions,
- (vi) a stroke sensor configured to measure a displacement amount of the mobile engaging portion vertically, wherein a zero displacement amount is defined when the engagement pin is in the disengaged flat groove portion, and
- wherein the drive device is configured to control engagement and disengagement of the mobile engaging portion by rotating the shift drum based on:
- (i) a target rotation angle of the shift drum associated with a target displacement of the mobile engaging portion, and
- (ii) a corrected detected angle of the shift drum.
Dependencies are inferred from the claim text.