WO2006041177A1 - 操舵輪が駆動される車輌の電動式パワーステアリング装置の制御装置 - Google Patents
操舵輪が駆動される車輌の電動式パワーステアリング装置の制御装置 Download PDFInfo
- Publication number
- WO2006041177A1 WO2006041177A1 PCT/JP2005/018994 JP2005018994W WO2006041177A1 WO 2006041177 A1 WO2006041177 A1 WO 2006041177A1 JP 2005018994 W JP2005018994 W JP 2005018994W WO 2006041177 A1 WO2006041177 A1 WO 2006041177A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- steering
- target value
- torque
- vehicle
- increase
- Prior art date
Links
- 230000002123 temporal effect Effects 0.000 claims description 7
- 230000007935 neutral effect Effects 0.000 claims description 4
- 238000012937 correction Methods 0.000 description 25
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000013016 damping Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 101100406879 Neurospora crassa (strain ATCC 24698 / 74-OR23-1A / CBS 708.71 / DSM 1257 / FGSC 987) par-2 gene Proteins 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 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
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
- B62D5/0457—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by control features of the drive means as such
- B62D5/046—Controlling the motor
- B62D5/0463—Controlling the motor calculating assisting torque from the motor based on driver input
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D6/00—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
- B62D5/0457—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by control features of the drive means as such
- B62D5/046—Controlling the motor
- B62D5/0466—Controlling the motor for returning the steering wheel to neutral position
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
- B62D5/0457—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by control features of the drive means as such
- B62D5/046—Controlling the motor
- B62D5/0472—Controlling the motor for damping vibrations
Definitions
- the present invention relates to a control device for an electric power steering device for a vehicle in which a steering wheel is driven.
- An electric power steering device that uses an electric motor as a power device is known as one of the power steering devices that assist the steering by the driver's handle operation with the power device. Since the electric power steering device using an electric motor can freely control the magnitude of the steering assisting force independently of the steering angle and steering angular velocity, the operation of the electric power steering device is related to the driving state of the vehicle.
- Various attempts have been made to control. As one example, Japanese Patent Application Laid-Open No.
- Hei 8-10 4 2 4 9 aims to improve the deflection performance due to torque steer during starting and acceleration without affecting the steering reaction force during normal driving. Therefore, the reaction force component based on the detected value of the vehicle behavior including the normal rate is included in the drive command to the motor, and the driving force of the steered wheel is detected, and the reaction force component is detected based on the detected driving force. It has been proposed to correct the parameter gain. Disclosure of the Invention When steering wheels are driven, there is a problem of torque steer that the steering of the vehicle is disturbed by the difference in driving force applied to the pair of left and right steering wheels. But before that, even if a uniform driving torque was applied to a pair of steered wheels, as the driving force increased, the vehicle tried to go straight ahead more strongly. Greater force is required to change the direction of the steering wheel to deflect in either the left or right direction.
- the present invention mainly aims to improve the steering feeling of a vehicle equipped with an electric power steering device capable of controlling the steering assisting force without being influenced by the steering angle or the steering angular velocity. is doing.
- the present invention applies steering control at the time of turning back the handle by applying the operation control of the electric power steering device focusing on the driving force of the steering wheel as described above at the time of turning back the handle.
- a further objective is to improve.
- Another object of the present invention is to reliably prevent the steering from being overshot even when the steering assisting force is increased to improve the steering feeling according to the above-described procedure.
- the present invention provides an electric power steering for a vehicle having a handle, a pair of steering wheels that are steered by the handle, and a power source that drives the steering wheels.
- a control device of the steering device As a control device of the steering device, the target value of the steering assist force to be generated by the electric power steering device is increased according to the increase of the steering torque of the steering wheel, and the driving torque of the steering wheel is increased by the power source.
- the present invention proposes a control device characterized by having an arithmetic device that calculates to increase with the degree of increase in response to the above.
- the target value of the steering assisting force that should be generated by the electric power steering device is increased to the extent that the steering wheel driving torque of the steering wheel is increased according to the increase of the steering torque.
- the steering assist force increases with the steering torque of the steering wheel, and the steering resistance increases with the increase of the steering wheel driving torque.
- the steering feel of the handle can be stabilized.
- the calculation device may further increase the steering assist force target value in accordance with an increase in the temporal differential value of the steering angle of the handle.
- the steering assist force target value is further increased in accordance with the increase in the time differential value of the steering angle of the handle, the steering resistance is increased in response to the increase in the time differential value of the steering angle of the steering wheel.
- Supporting force target values can be adapted more appropriately.
- the arithmetic unit is adapted to calculate a steering assist force target value for switching back that increases with an increase in driving torque of the steering wheel when the handle is switched back toward the neutral position. Good. Such control also improves the feel of switchback steering.
- the arithmetic unit may reduce the steering assist force target value for switching back as the vehicle speed increases. In this way, when the vehicle is traveling at a certain speed or higher, the switchback steering assisting force does not cause excessive turning back and steering instability, resulting in unstable driving. This can only be done when the vehicle is actually needed or when driving at very low speeds.
- the arithmetic unit may be configured to maximize the steering assist force target value for switching back when the steering angle of the handle is medium.
- the switchback steering assist force can be adapted to the switchback operation force that changes according to the steering angle of the steering wheel.
- the arithmetic unit may reduce the steering assist force target value in accordance with an increase in the temporal differential value of the steering angle of the handle at a degree that increases as the vehicle speed increases.
- the vehicle speed range in which the steering assist force target value is decreased in accordance with the increase in the temporal differential value of the handle steering angle is adjusted, and the steering assist force is increased in accordance with the increase in the temporal differential value of the handle steering angle.
- FIG. 1 is a schematic diagram of a vehicle showing components related to a control device according to the present invention.
- FIG. 2 is a flowchart showing the main routine of the operation of the control device according to the present invention.
- FIG. 3 is a flowchart showing a subroutine which is executed in step 100 of the main routine and which calculates a correction torque T sv for the steering angular velocity, the vehicle speed, and the steering wheel driving torque.
- FIG. 4 is a flowchart showing a subroutine that is executed in step 200 of the main routine and that calculates a correction torque T nr for the steering angle, the vehicle speed, and the steering wheel driving torque at the time of switching back.
- FIG. 5 is a map showing the basic value T abo of the steering assist torque target value based on the steering torque T s.
- Fig. 6 is a map showing the vehicle speed coefficient K v that corrects T abo for vehicle speed V.
- FIG. 7 is a map showing a drive torque coefficient K twf for correcting basic values of correction torques T sv and T nr described later with respect to the steering wheel drive torque T wf.
- Fig. 8 is a map showing the basic value T svo of the correction torque T sv based on the time differential value ⁇ of the steering angle.
- Figure 9 is a map showing the vehicle speed coefficient Ksv that corrects T svo against vehicle speed V.
- Fig. 10 is a map showing the basic value T nro of the correction torque Tnr at the time of return based on the steering angle ⁇ .
- Figure 11 shows a map that shows the vehicle speed coefficient Knv that corrects T nro for vehicle speed V.
- Fig. 12 is a map showing the basic straight line T dpo of the correction torque T dp based on the time derivative ⁇ 'of the steering angle.
- Figure 13 shows a map showing the vehicle speed coefficient Kvdp that corrects Tdpo for vehicle speed V.
- 1 0 FL, 1 0 FR, 1 0 RL, 1 0 RR are the left front wheel, the right front wheel, and the left rear wheel mounted on the vehicle body 1 2 by a wheel suspension device not shown in the figure.
- the left front wheel 1 0 FL and right front wheel 1 0 FR are tyrosed by a steering wheel 14 operated by the driver and an electric power steering device generally indicated by 1 6. It is a steered wheel that is steered via 18 L and 18 R. 20 is an electronic control unit incorporating a microcomputer.
- the electric power steering device 1 6 includes an electric motor 2 2, and the electric motor is connected to a rack bar 2 through a motion conversion device 2 6 that is a ball and a screw.
- the tie rods 1 8 L and 1 8 R pivoted to both ends of the rack par 2 4 are connected to the steered wheels 1 0 FL and 1 0 FR by the king pins not shown in the figure. It is designed to rotate around.
- FR is a power source consisting of a normal engine not shown in the figure or It is driven by a hybrid power source consisting of a combination of an engine and one or two motor generators.
- the 30 is a brake device, which is not shown in detail in the figure, but has a hydraulic circuit 32 which is well known in the technical field, and is well known in the technical field.
- the wheel cylinders 3 4 FL, 3 exert a braking force on the brake discs incorporated in each of the wheels 10 FL, 10 FR, 10 RL, 10 RR. 4 FR, 3 4 RL and 3 4 RR are selectively supplied with braking hydraulic pressure.
- the hydraulic circuit 32 is also connected to a manual brake device including a brake pedal 36 and a master cylinder 38 which are well known in the art so that the vehicle is in the normal mode under the driver's braking operation.
- 40 is a secondary device for performing vehicle stabilization control that is performed by automatically controlling the hydraulic circuit 32 as is known in various ways in the art. This is an electronic control device.
- Reference numeral 4 2 denotes a steering shaft that supports the handle 14 and is rotated according to the steering operation by the driver and drives the rack bar 24 manually by way of a pinion (not shown).
- Reference numeral 44 denotes a steering angle sensor that detects the rotation angle of the steering shaft 42 and transmits a signal indicating the steering angle ⁇ to the electronic control unit 20.
- Reference numeral 46 denotes a torque sensor that detects a steering torque transmitted through the steering shaft 42 and transmits a signal indicating its value Ts to the electronic control unit 20.
- 48 is a vehicle speed sensor that detects the vehicle speed in a variety of ways in the field of this technology and transmits a signal indicating its value V to the electronic control unit 20 in a known manner.
- Reference numeral 50 denotes an engine control unit that performs traction control in a manner known in the art in cooperation with the electronic control unit 40.
- the operation of the control device for the electric power steering device 16 according to the present invention is carried out substantially by a control program loaded in the electronic control device 20 according to the present invention. This control will be described below with reference to FIG. 2-13 for one embodiment.
- FIG. 2 is a flowchart showing a main routine of the above control.
- the control according to this main routine is repeated during operation of the vehicle at a cycle such as 10 to 100 milliseconds when an ignition switch (not shown) is closed.
- step 10 signals are read from the steering angle sensor 4 4, the steering torque sensor 4 6, the vehicle speed sensor 4 8, and other sensors not shown in the drawings.
- the basic value of the steering assist force target value to be generated by the electric power steering device is calculated based on the steering torque of the steering wheel and the vehicle speed.
- the steering assist force is the steering assist torque
- the basic value of the target value is the steering assist torque target value with reference to the map shown in FIG. Calculated as the basic value of T ab.
- the basic value T abo for the basic value T ab of the steering assist torque target value is calculated based on the steering torque T s of the handle, with reference to a map as illustrated in FIG. T abo is calculated to increase as the value increases.
- the values for the left and right turns of the vehicle are displayed as positive or negative, respectively.
- the vehicle speed coefficient K v is calculated on the basis of the vehicle speed V with reference to a map as illustrated in FIG.
- step 30 the front wheel drive torque T wf is calculated. This can be calculated based on the output of the power source and the gear ratio of the drive system.
- a driving torque coefficient K for reflecting the influence of the driving torque of the steered wheels in correcting the steering assist torque target value is calculated based on the driving torque T wf of the steered wheel so that K twf increases as T wf increases with reference to a map as illustrated in FIG.
- step 50 it is determined whether steering is in reverse steering. If the answer is no, the control proceeds to step 60, where the correction torque T nr for the steering wheel drive torque at the time of switchback steering is reset to zero. On the other hand, if the answer to step 50 is yes, control proceeds to step 70 where it is determined whether the steering condition is within a certain narrow range around the neutral position. If the answer is yes, control is returned to step 60. If the answer to step 70 is no, that is, when the return steering is being performed at a certain large steering angle, the control proceeds to step 80, and the steering wheel driving torque when not at the return steering is not controlled. Correction torque T sv is reset to 0.
- step 60 the control proceeds to step 100, and a correction value T sv of the steering assist torque with respect to the steering wheel driving torque is calculated according to the flowchart of the subroutine shown in FIG.
- step 1 1 referring to the map illustrated in FIG. 8, the steering torque correction value T sv based on the temporal differential value 0 ′ of the steering angle 0 Is calculated so that T sv increases as ⁇ ′ increases.
- the values for the left turn and right turn of the vehicle are displayed as positive or negative, respectively.
- step 1 2 based on the vehicle speed V, a vehicle speed coefficient K for correcting the basic value T svo of the correction torque T sv with respect to the vehicle speed with reference to a map as illustrated in FIG. sv is calculated so that K sv decreases as V increases.
- K sv is a coefficient that becomes 0 when the vehicle speed exceeds a certain level.
- step 5 0 when the steering is at a position more than a predetermined angle away from the vicinity of the neutral position and is being turned back, the answer to step 5 0 is yes and the answer to step 7 0 is no. After 0, the control proceeds to 200, and the correction torque Tnr at the time of switchback steering is calculated according to a subroutine as illustrated in FIG.
- step 2 1 the basic value Tnro for the correction torque Tnr at the time of return steering is referred to as a map illustrated in FIG. Based on the steering angle ⁇ , when 0 increases from a small value to a medium value, T nro increases at a negative value according to the increase, and when 0 further increases, according to the increase. The absolute value of Tnro is reduced. In this case as well, the values for the left turn and right turn of the vehicle are displayed as positive or negative, respectively. Therefore, Tnro is the torque that acts in the return direction when the steering is returned.
- step 220 the control proceeds to step 220, and the vehicle speed coefficient Knv for correcting Tnro with respect to the vehicle speed is based on the vehicle speed V, referring to a map as illustrated in FIG. Therefore, Knv is calculated to decrease.
- the correction torque Tdp according to the time differential value ⁇ 'of the steering angle ⁇ becomes a negative value as the time differential value 0' of the steering angle 0 increases.
- the absolute value increases, and this gives the steering device a damping effect according to the rate of change of the steering angle ⁇ so that the power assist steering does not go too far.
- This damping effect increases as the vehicle speed increases.
- the vehicle speed region where Tsv works effectively and the vehicle speed region where Tdp works effectively are different from each other.
- the correction torque Tsv which increases as the angular differential value ⁇ , increases, acts in the low vehicle speed range, and gives a damping effect to the steering assist as the change rate of the steering angle increases. Tdp increases in the high vehicle speed range. Act.
- the basic value Tab of the steering assist torque target value calculated based on the maps in FIGS. 5 and 6 is increased by the torque T sv calculated by the subroutine in FIG.
- the basic value Tab is the torque calculated by the subroutine of Fig. 4.
- the return assist torque is applied with a negative correction by the absolute value of Tnr, and in any case, the time derivative of the steering angle at higher vehicle speeds.
- the correction of the steering assist torque target value by the correction torques Tsv, Tnr, and Tdp is performed in addition or subtraction. Corrections using these correction torques may be performed in the manner of product correction by converting the values of T sv, T nr, and T dp into appropriate product coefficients.
- step 3 20 steering assist control is performed based on the steering assist torque target value Ta calculated as described above.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Steering Control In Accordance With Driving Conditions (AREA)
- Power Steering Mechanism (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/664,697 US8352123B2 (en) | 2004-10-14 | 2005-10-11 | Control device of electric power steering device for vehicles in which steered wheels are driven |
KR1020077008392A KR100889709B1 (ko) | 2004-10-14 | 2005-10-11 | 조타륜이 구동되는 차량의 전동식 파워 스티어링 장치의제어 장치 |
CN2005800346634A CN101039835B (zh) | 2004-10-14 | 2005-10-11 | 驱动转向轮的车辆用电动转向装置的控制装置 |
EP05793366A EP1800994B1 (en) | 2004-10-14 | 2005-10-11 | Controller of electric power steering device of vehicle in which steered wheels are driven |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004-299755 | 2004-10-14 | ||
JP2004299755A JP4293106B2 (ja) | 2004-10-14 | 2004-10-14 | 電動式パワーステアリング装置用制御装置 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006041177A1 true WO2006041177A1 (ja) | 2006-04-20 |
Family
ID=36148463
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/018994 WO2006041177A1 (ja) | 2004-10-14 | 2005-10-11 | 操舵輪が駆動される車輌の電動式パワーステアリング装置の制御装置 |
Country Status (6)
Country | Link |
---|---|
US (1) | US8352123B2 (ja) |
EP (1) | EP1800994B1 (ja) |
JP (1) | JP4293106B2 (ja) |
KR (2) | KR100912843B1 (ja) |
CN (2) | CN101704382B (ja) |
WO (1) | WO2006041177A1 (ja) |
Families Citing this family (16)
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JP4636994B2 (ja) * | 2005-10-24 | 2011-02-23 | 日立オートモティブシステムズ株式会社 | 車両駆動装置 |
JP4747958B2 (ja) * | 2006-06-15 | 2011-08-17 | トヨタ自動車株式会社 | パワーステアリング装置 |
JP5238441B2 (ja) * | 2008-10-03 | 2013-07-17 | 本田技研工業株式会社 | 電動パワーステアリング装置 |
KR101285052B1 (ko) * | 2008-12-26 | 2013-07-10 | 도요타 지도샤(주) | 차량의 주행 지원 장치 |
DE102009045046A1 (de) * | 2009-09-28 | 2011-03-31 | Zf Lenksysteme Gmbh | Verfahren zum Betrieb eines elektronischen Servolenksystems eines Kraftfahrzeugs |
WO2012037951A2 (en) * | 2010-09-23 | 2012-03-29 | Thyssenkrupp Presta Ag | Driver assistance control in an electric steering system |
JP5316599B2 (ja) * | 2011-07-05 | 2013-10-16 | トヨタ自動車株式会社 | 操舵装置及び操舵制御装置 |
JP5863354B2 (ja) * | 2011-09-20 | 2016-02-16 | 富士重工業株式会社 | 車両のパワーステアリング制御装置 |
JP2013212715A (ja) * | 2012-03-30 | 2013-10-17 | Showa Corp | 電動パワーステアリング装置 |
US9656686B2 (en) * | 2012-12-07 | 2017-05-23 | Toyota Jidosha Kabushiki Kaisha | Drive supporting device, operation detecting device, and controller |
GB201317766D0 (en) * | 2013-10-08 | 2013-11-20 | Trw Ltd | Electrical power assisted steering system |
KR102183049B1 (ko) * | 2014-04-14 | 2020-11-25 | 주식회사 만도 | Lkas와 연동하는 적응 순항 제어 시스템 및 그의 정속 제어 방법 |
KR102172576B1 (ko) * | 2014-09-02 | 2020-11-02 | 현대모비스 주식회사 | Mdps 시스템의 프릭션 보상 제어 장치 및 방법 |
DE102016216796B4 (de) * | 2015-09-08 | 2023-10-26 | Toyota Jidosha Kabushiki Kaisha | Lenkreaktionskraftsteuervorrichtung für fahrzeug |
US11679805B2 (en) | 2019-04-01 | 2023-06-20 | Steering Solutions Ip Holding Corporation | Traction steer mitigation through CVR gain scalars |
CN111661140B (zh) * | 2020-01-09 | 2021-06-11 | 吉林大学 | 一种电动助力转向系统助力特性表计算方法 |
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- 2005-10-11 WO PCT/JP2005/018994 patent/WO2006041177A1/ja active Application Filing
- 2005-10-11 CN CN2009102533480A patent/CN101704382B/zh not_active Expired - Fee Related
- 2005-10-11 CN CN2005800346634A patent/CN101039835B/zh not_active Expired - Fee Related
- 2005-10-11 US US11/664,697 patent/US8352123B2/en not_active Expired - Fee Related
- 2005-10-11 KR KR1020077008392A patent/KR100889709B1/ko not_active Expired - Fee Related
- 2005-10-11 EP EP05793366A patent/EP1800994B1/en not_active Ceased
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Also Published As
Publication number | Publication date |
---|---|
JP4293106B2 (ja) | 2009-07-08 |
CN101039835B (zh) | 2010-09-29 |
KR20080111169A (ko) | 2008-12-22 |
CN101704382B (zh) | 2012-01-11 |
EP1800994A4 (en) | 2008-01-30 |
US20070265751A1 (en) | 2007-11-15 |
CN101039835A (zh) | 2007-09-19 |
EP1800994A1 (en) | 2007-06-27 |
KR100889709B1 (ko) | 2009-03-23 |
CN101704382A (zh) | 2010-05-12 |
EP1800994B1 (en) | 2012-03-28 |
JP2006111110A (ja) | 2006-04-27 |
KR100912843B1 (ko) | 2009-08-18 |
KR20070052349A (ko) | 2007-05-21 |
US8352123B2 (en) | 2013-01-08 |
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