WO2011061768A1 - Tilting vehicle and control system thereof - Google Patents
Tilting vehicle and control system thereof Download PDFInfo
- Publication number
- WO2011061768A1 WO2011061768A1 PCT/IT2009/000520 IT2009000520W WO2011061768A1 WO 2011061768 A1 WO2011061768 A1 WO 2011061768A1 IT 2009000520 W IT2009000520 W IT 2009000520W WO 2011061768 A1 WO2011061768 A1 WO 2011061768A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- control
- vehicle
- frame
- control unit
- actuating means
- Prior art date
Links
- 238000000034 method Methods 0.000 claims description 13
- 230000007423 decrease Effects 0.000 claims description 6
- 230000003213 activating effect Effects 0.000 claims 5
- 230000001133 acceleration Effects 0.000 description 11
- 230000004913 activation Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000002301 combined effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000011045 prefiltration Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62K—CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDE-CARS, FORECARS, OR THE LIKE
- B62K5/00—Cycles with handlebars, equipped with three or more main road wheels
- B62K5/08—Cycles with handlebars, equipped with three or more main road wheels with steering devices acting on two or more wheels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62K—CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDE-CARS, FORECARS, OR THE LIKE
- B62K5/00—Cycles with handlebars, equipped with three or more main road wheels
- B62K5/02—Tricycles
- B62K5/027—Motorcycles with three wheels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62K—CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDE-CARS, FORECARS, OR THE LIKE
- B62K5/00—Cycles with handlebars, equipped with three or more main road wheels
- B62K5/10—Cycles with handlebars, equipped with three or more main road wheels with means for inwardly inclining the vehicle body on bends
Definitions
- the present invention relates to a tilting vehicle comprising more than two wheels at least one of which is a tilting wheel, in particular a three- wheeled vehicle, and to a control system thereof.
- a tilting vehicle with more than two wheels generally comprises a frame attached to the wheels in a tilting manner with respect to the ground so that the frame tilts during steering, actuating means connected to the frame and a tilting control unit connected to the actuating means to control the angular position of the frame.
- Controlling of the angular position of the frame and of the tilting wheels is an important issue relating to tilting vehicles.
- Tilting vehicles are known where the tilting control unit uses a lateral acceleration sensing algorithm.
- a lateral acceleration sensing algorithm generally known in the scientific literature as "Direct Tilt Control, DTC"
- DTC Direct Tilt Control
- actuators are powered after the wheels substantially steer and an inertial load is generated during steering.
- actuators requires the power to counterbalance the full steering inertial load.
- steering inertial load is positively related to speed and may reach high values. Therefore wheels must have a relatively high lateral distance in order to avoid rollover and ensure stability in any driving condition.
- the scope of the present invention is to provide a tilting vehicle free from the aforementioned drawbacks .
- a further scope of the present invention is to provide a control method for a tilting vehicle.
- the scope of the present invention is achieved by a vehicle according to claim 1 and a control method according to claim 1 .
- FIG. 1 is a perspective view of a vehicle according to the present invention with straight steering wheels and non-tilted frame;
- FIG. 2 is an enlarged perspective view of a front portion of figure 1 ;
- FIG. 3 is an enlarged, longitudinal cross section of a component of the steering unit of the vehicle of figure 1;
- FIG. 4 is a block diagram of a control method implemented to control the vehicle of figure 1.
- a tilting vehicle comprising a tilting frame 2, two front wheels 3 and a single rear wheel 4, wheels 3 and 4 being connected to frame 2.
- Frame 2 is a completely rigid frame supporting the components of the vehicle, e.g. internal combustion engine, seat of the driver, and can be configured with an upper portion 5 protecting the driver in the frontal, rear and upward direction.
- Vehicle 1 further comprises an internal combustion engine driving rear wheel 4 and, preferably, electric motors housed in front wheels 3, i.e. front wheels 3 are electric motor wheels.
- Front wheels 3 are connected to a front portion
- connection of wishbone arms 8 is such that front wheels 3 can move independently from one another to absorb a relief or a depression of a street.
- each front wheel 3 is connected to front portion 7 by an upper and a lower wishbone 8 and all wishbones 8 have the same length.
- Lower and upper wishbone 8 are parallel to one another in any 1
- wishbones 8, front portion 7 and front wheels 3 are connected as described in patent application EP1798081.
- FIG 2 a steering unit 10 of vehicle 1 is shown .
- Steering unit 10 comprises a rotatable handlebar 11 directly operated by the driver and a device 12 configured to transmit the angular position of handlebar 11 to front wheels 3.
- device 12 comprises a rotatable steering column 13 connected to front wheels 3 in a manner that is known in the art ' and will not be described further, a torsionally resilient joint 14 to couple in a torsionally resilient manner handlebar 11 to wheels 3 and a steering actuator 15 (schematically shown in figure 1) providing the largest amount of torque to steer wheels 3.
- steering column 13 comprises a first portion 13' connected between handlebar 11 and resilient joint 14, and a second portion 13'' connected between joint 14 and front wheels 3.
- resilient joint 14 is configured to have two stop position so that handlebar 11 and steering column portion 13'' may relatively rotate within a predefined interval. Once the maximum relative angular position is reached in either, rotational directions, handlebar 11 and steering column 13 become connected in a rotationally rigid way so that if handlebar 11 is further rotated by a certain amount, steering column portion 13'' is driven in rotation by the same amount.
- resilient joint 14 comprises a torsion bar 16 connected between steering column portions 13' and 13'', a sleeve 17 rigidly connected to steering column portion 13' and two fixed pins 18 radially extending from steering column portion 13'' towards torsion bar 16.
- Each pin has an end portion engaging a respective circumferential slot 19 (only one slot is illustrated in figure 3) defined by sleeve 17.
- each slot 19 is circumferentially delimited by two abutments 20.
- the angular interval wherein handlebar 11 and steering column portion 13'' can relatively rotate is defined by the circumferential dimension of slot 19.
- resilient joint 14 also comprises a first and a second angular sensor 21 and 22 to detect the relative angular position of steering column portions 13' and -13''.
- output of sensors 21 and 22 can be combined to the stiffness of torsion bar 16 in order to evaluate the torque that the user applies to handlebar 11.
- the measure of steering wheel torque is not directly and immediately transformed into torque at the steerbox that rotates front wheels 3.
- Vehicle 1 further comprises a tilting control unit that controls the tilting position of frame 2 with respect to the street surface.
- Such tilting control unit comprises actuating means 23 holding frame 2 in a preferred tilting position, a plurality of sensors 24 detecting dynamic parameters of vehicle 1 and an electronic control unit 25 elaborating the outputs of sensors 24 and of sensors 21, 22 to control steering actuator 15 and actuating means 21 through a signal S that will be better described later on.
- actuating means 21 comprises a rotating motor 26, in particular an electric motor, a reduction gear 27 connected to the output of motor 26 by a transmission, e.g. a belt transmission, ⁇ a crank arm 28 connected to a first output shaft of gear 27 and rising transversally, e.g. perpendicularly in a rest position, with respect to wishbone arms 8, and a brake B, e.g. a disk brake, to block motor 26, gear 27 and ram 28 in a preferred position.
- Disk brake B is controlled by electronic control unit as well.
- Actuating means 21 and frame 2 are connected as follows.
- Front portion 7 of frame 2 has a substantially parallelepiped shape each corner of which is hinged to a respective wishbone 8. Front portion 7 is rigidly connected to the housing of motor 26 and of gear 27.
- Crank arm 28 is connected to both right and left upper wishbones 8 by means of a respective shock absorber 29 and 30 set at opposite sides with respect to crank arm 28.
- torsion bar 16 is designed to have a low stiffness such that a rotation -of the handlebar 11 having pin 18 not contacting abutments 20 does not substantially steer front wheels 3 per se, i.e. front wheels 3 substantially steer either because of tilting and/or because of the activation of steering actuator 15 and do not substantially steer when handlebar is rotated and pin 18 is not contacting abutments 20.
- front wheels 3 do not substantially rotate to follow the road bend according to the input given by handlebar 11 as in standard powered steering systems.
- electronic control unit 25 activates motor 26 to initiate tilting of frame 2 and front wheels 3 towards the centre of the bend.
- ECU 25 may activate actuator 15 and wheels 3 further steer by the proper angle preferably calculated on the basis of the torque applied by the user to handlebar 11 in order to give to the driver the same feeling as with a torsionally rigid device 12, i.e. torsion bar 16 is a part of a torque sensor. Therefore, according to the present invention, ECU 25 activates tilting of frame 2 and of wheels 3, 4, when the user rotates handlebar 11. The tilting of front wheels 3 produces per se a turning of vehicle 1. In order to provide the proper turning of vehicle 1 in view of the speed and the radius of curvature of the road bend, ECU 25 may activate steering actuator 15 to further steer front wheels 3.
- ECU 25 implements a control method by which at low speed, i.e. below 25 km/h, wheels 3 steer because steering actuator 15 is actuated and frame 2 is maintained substantially perpendicular with respect to the ground surface.
- torsional stiffness of device 12 between handlebar 11 and front wheel 3 is maximum, ideally infinite, i.e. handlebar 11 and front wheels 3 are torsionally connected in a rigid way.
- Torsional stiffness between handlebar 11 and front wheels 3 is given by the combined effect of torsion bar 16 and steering actuator 15 and is variable.
- steering actuator 15 is activated so to give a small steering angle to front wheels 3.
- ECU 25 activates steering actuator 15 so that handlebar 11 and portion 13 ' ' rotates by the same angle .
- ECU 25 activates steering actuator 15 depending on the speed of vehicle 1 measured by sensor 24.
- torsional stiffness of device 12 decreases when speed of vehicle 1 increases. Decrease of torsional stiffness may follow many different paths, e.g. continuous and monotone paths.
- speed of vehicle 1 is low, the turning effect deriving from the tilting of front wheel 3 becomes less and less effective and turning takes place by steering front wheels 3 through steering actuator 15, as previously described.
- ECU 25 controls both steering actuator 15 and actuating means 23.
- stiffness of device 12 decreases so that when the driver turns handlebar 11 actuating means 23 are activates so that frame 2 and front wheels 3 tilt.
- ECU 25 When also actuator 15 is activated, ECU 25 continues to control the angular position of frame 2 in order to counterbalance the inertial load due to lateral acceleration of frame 2 itself and minimize the resulting overall force applied to the center of gravity of the frame.
- ECU 25 is configured to set the lateral acceleration at a level that is perceivable by the driver, so that
- Figure 4 shows in a greater detail how tilting control unit of vehicle 1, resilient joint 14 and steering actuator 15 are connected.
- Main input to the system are road profile 30 torque 31 on handlebar 11 and external forces acting on the frame, e.g. wind 32.
- frame 2 is equipped with sensors 24 measuring longitudinal speed, right wishbone angle, left wishbone angle, crank 28 angle, lateral acceleration.
- the output of sensors 24 are elaborated by a state observer to obtain the estimated values over time of parameters such as estimated lateral acceleration 34, and estimated roll angle 35.
- Other parameters are: estimated crank angle 28, estimated right wishbone angle, estimated left wishbone angle, estimated longitudinal speed, estimated steering column portion 13' angle, estimated steering column portion 13 ' ' angle and estimated steering column deformation ⁇ 36, defined as difference between estimated steering column portion 13', 13'' angles.
- ECU implements a feedback control 38 for tilt torque, a feedforward control 39 for tilt torque and a reference torque control for steering actuator 15 of front wheels 3.
- feedback control 38 has a first input defined by estimated lateral acceleration 34 and a second input, defined by desired lateral acceleration 40 set by supervisor 37.
- Estimated and lateral acceleration 34, 37 are processed by a subtraction node 41 and the resulting error signal is multiplied by a variable gain 42 controlled by supervisor 37.
- the resulting gained error signal is processed by prefilter 43 and subtracted to estimated roll angle 35 in node 44.
- the resulting error signal is an input for an addition node 45.
- Feedforward control 39 comprises estimated steering column deformation 36 and a gain 46 controlled by supervisor 37.
- the resulting gained signal is processed in addition node 45 to generate control signal S for actuating means 21.
- Signal S is also split downstream to node 45 and processed by a variable gain 47 controlled by supervisor 37 to generate signal 48 enabling brake B.
- control signal S has a mixed structure defined by both a feedforward component and a feedback component .
- ECU 25 also controls steering, actuator 15.
- estimated steering column deformation 36 is split before entering in supervisor 37 and processed in a subtraction node 49 with desired steering column deformation 50 set by supervisor 37.
- the resulting error signal is processed by a variable gain 51 to obtain control signal 52 for steering actuator 15.
- vehicle 1 The advantages of vehicle 1 according to the present invention are the following.
- Frame 2 and front wheels 3 tilt to provide in combination a turning effect and a decrease in lateral acceleration.
- the center of gravity of frame 2 and all of the components attached thereto moves towards the center of curvature of the bend and generate a momentum opposite to that generated by centrifugal inertial force resulting in a reduced overall momentum applied to the frame. Therefore, reaction between the ground and front wheels 3 due to such overall momentum is reduced and either the track of the wheels 3 can be reduced or the maximum speed of the vehicle running the bend can increase without impacting on stability.
- Such principle is applied to a vehicle having three wheels and two front steering wheels and the effect is particularly appreciated in that the lateral dimension of the vehicle may be decreased to achieve a stability that is superior to that of two wheeled vehicles with a minimum increase in lateral dimension, in order to be more agile in traffic compared to four wheeled vehicles. All the above advantages are achievable because handlebar 11 is connected to
- Spring 14 can be totally absent so that front wheels 3 steer by wire.
- torsional stiffness control of device 12 can be avoided to simplify ECU 25 and a comparable functioning can be obtained by the sole variation of time delay of actuation of steering actuator 15 after actuating means 23.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Automatic Cycles, And Cycles In General (AREA)
- Vehicle Body Suspensions (AREA)
- Steering Control In Accordance With Driving Conditions (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/510,905 US8583325B2 (en) | 2009-11-18 | 2009-11-18 | Tilting vehicle and control system thereof |
BR112012011903A BR112012011903A2 (en) | 2009-11-18 | 2009-11-18 | tiltable vehicle and its control system |
PCT/IT2009/000520 WO2011061768A1 (en) | 2009-11-18 | 2009-11-18 | Tilting vehicle and control system thereof |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/IT2009/000520 WO2011061768A1 (en) | 2009-11-18 | 2009-11-18 | Tilting vehicle and control system thereof |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2011061768A1 true WO2011061768A1 (en) | 2011-05-26 |
WO2011061768A8 WO2011061768A8 (en) | 2012-07-05 |
Family
ID=42338086
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IT2009/000520 WO2011061768A1 (en) | 2009-11-18 | 2009-11-18 | Tilting vehicle and control system thereof |
Country Status (3)
Country | Link |
---|---|
US (1) | US8583325B2 (en) |
BR (1) | BR112012011903A2 (en) |
WO (1) | WO2011061768A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105307924A (en) * | 2014-03-18 | 2016-02-03 | 搜索制品株式会社 | Vehicle |
WO2017082424A1 (en) * | 2015-11-13 | 2017-05-18 | ヤマハ発動機株式会社 | Leaning vehicle |
WO2020240273A1 (en) | 2019-05-24 | 2020-12-03 | Centro De Innovación Para Motociclistas Tech4Riders S.A.S | Safe motorbike |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA3005034A1 (en) * | 2015-11-13 | 2017-05-18 | Yamaha Hatsudoki Kabushiki Kaisha | Leaning vehicle |
JP6648155B2 (en) * | 2015-11-13 | 2020-02-14 | ヤマハ発動機株式会社 | Inclined vehicle |
CA3006013A1 (en) * | 2015-11-20 | 2017-05-26 | Yamaha Hatsudoki Kabushiki Kaisha | Vehicle |
WO2017194688A1 (en) * | 2016-05-13 | 2017-11-16 | Brudeli Tech Holding As | Leaning vehicle |
JP6743735B2 (en) * | 2017-03-17 | 2020-08-19 | トヨタ自動車株式会社 | Self-tilting vehicle |
JP2018172072A (en) * | 2017-03-31 | 2018-11-08 | 株式会社エクォス・リサーチ | vehicle |
EP3927609B1 (en) * | 2019-02-22 | 2024-05-08 | Sway Motorsports LLC | Three-wheeled tilting vehicle |
US11072389B2 (en) * | 2019-02-22 | 2021-07-27 | Sway Motorsports Llc | Three-wheeled tilting vehicle |
EP4005909B1 (en) * | 2019-08-30 | 2024-02-28 | Yamaha Hatsudoki Kabushiki Kaisha | Leaning vehicle |
JPWO2021039989A1 (en) * | 2019-08-30 | 2021-03-04 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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WO1999014099A1 (en) * | 1997-09-16 | 1999-03-25 | Brinks Westmaas B.V. | Tilting vehicle |
WO2002044008A2 (en) * | 2000-11-29 | 2002-06-06 | Nicholas Richard Shotter | Motorcycle-type vehicle |
WO2004074076A2 (en) * | 2003-02-18 | 2004-09-02 | Franklin Ferdinand Niedrig | Anti-theft device for vehicles steered by a handlebar |
WO2006130007A2 (en) * | 2005-05-31 | 2006-12-07 | Brinks Westmaas B.V. | Self-balancing vehicle |
EP1798081A1 (en) | 2005-12-16 | 2007-06-20 | Fondazione Torino Wireless | Vehicle with tilting suspension system |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
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US6575263B2 (en) * | 2001-04-26 | 2003-06-10 | Eaton Corporation | Torque device for electronic steer-by wire steering systems |
JP4388383B2 (en) * | 2004-01-07 | 2009-12-24 | 本田技研工業株式会社 | Vehicle steering system |
JP4586962B2 (en) * | 2004-04-20 | 2010-11-24 | トヨタ自動車株式会社 | Vehicle attitude control device |
WO2007041095A2 (en) * | 2005-09-30 | 2007-04-12 | Harley-Davidson Motor Company Group, Inc. | Leaning suspension mechanics |
JP5064779B2 (en) * | 2006-12-12 | 2012-10-31 | 義大 須田 | Attitude control device |
-
2009
- 2009-11-18 US US13/510,905 patent/US8583325B2/en not_active Expired - Fee Related
- 2009-11-18 BR BR112012011903A patent/BR112012011903A2/en not_active IP Right Cessation
- 2009-11-18 WO PCT/IT2009/000520 patent/WO2011061768A1/en active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999014099A1 (en) * | 1997-09-16 | 1999-03-25 | Brinks Westmaas B.V. | Tilting vehicle |
WO2002044008A2 (en) * | 2000-11-29 | 2002-06-06 | Nicholas Richard Shotter | Motorcycle-type vehicle |
WO2004074076A2 (en) * | 2003-02-18 | 2004-09-02 | Franklin Ferdinand Niedrig | Anti-theft device for vehicles steered by a handlebar |
WO2006130007A2 (en) * | 2005-05-31 | 2006-12-07 | Brinks Westmaas B.V. | Self-balancing vehicle |
EP1798081A1 (en) | 2005-12-16 | 2007-06-20 | Fondazione Torino Wireless | Vehicle with tilting suspension system |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105307924A (en) * | 2014-03-18 | 2016-02-03 | 搜索制品株式会社 | Vehicle |
EP2995532A1 (en) * | 2014-03-18 | 2016-03-16 | Searchware Kabushiki Kaisha | Vehicle |
EP2995532A4 (en) * | 2014-03-18 | 2016-07-13 | Searchware Kabushiki Kaisha | Vehicle |
US9963168B2 (en) | 2014-03-18 | 2018-05-08 | Searchware Kabushiki Kaisha | Vehicle |
WO2017082424A1 (en) * | 2015-11-13 | 2017-05-18 | ヤマハ発動機株式会社 | Leaning vehicle |
JPWO2017082424A1 (en) * | 2015-11-13 | 2018-08-30 | ヤマハ発動機株式会社 | Inclined vehicle |
US10894571B2 (en) | 2015-11-13 | 2021-01-19 | Yamaha Hatsudoki Kabushiki Kaisha | Leaning vehicle |
EP3360764B1 (en) * | 2015-11-13 | 2022-01-26 | Yamaha Hatsudoki Kabushiki Kaisha | Leaning vehicle |
WO2020240273A1 (en) | 2019-05-24 | 2020-12-03 | Centro De Innovación Para Motociclistas Tech4Riders S.A.S | Safe motorbike |
Also Published As
Publication number | Publication date |
---|---|
WO2011061768A8 (en) | 2012-07-05 |
BR112012011903A2 (en) | 2019-09-24 |
US8583325B2 (en) | 2013-11-12 |
US20120310478A1 (en) | 2012-12-06 |
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