WO2005021357A1 - パワーステアリングユニット - Google Patents
パワーステアリングユニット Download PDFInfo
- Publication number
- WO2005021357A1 WO2005021357A1 PCT/JP2004/012105 JP2004012105W WO2005021357A1 WO 2005021357 A1 WO2005021357 A1 WO 2005021357A1 JP 2004012105 W JP2004012105 W JP 2004012105W WO 2005021357 A1 WO2005021357 A1 WO 2005021357A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- assist force
- steering
- steering assist
- hydraulic oil
- pump
- Prior art date
Links
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
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
- B62D5/065—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by specially adapted means for varying pressurised fluid supply based on need, e.g. on-demand, variable assist
Definitions
- the present invention relates to a power steering unit that drives a pump that discharges hydraulic oil supplied to a steering assist force generating hydraulic actuator by an electric motor.
- Patent Document 1 JP-A-6-206554
- Patent Document 2 US Pat. No. 4,449,964
- Patent Document 3 US Patent No. 6419042
- a control valve in a conventional power steering device mechanically changes the opening degree of a throttle forming a flow path of hydraulic oil according to a steering direction and an operation state. Therefore, it is difficult to finely control the steering assist force, and the mechanical structure becomes complicated, so that the number of man-hours and the manufacturing cost increase. In addition, parts cannot be shared with manual-type steering devices, which makes it difficult to reduce manufacturing costs and also contributes to the conversion of manual-type steering devices to power steering devices. Furthermore, if the oil chamber in the hydraulic actuator on the side to which the hydraulic oil is supplied becomes negative pressure, the application of the steering assisting force is delayed, and the steering feeling deteriorates.
- An object of the present invention is to solve the above problems.
- a power steering unit includes a hydraulic actuator for generating a steering assist force, A tank for storing the hydraulic oil of the hydraulic actuator, a pump for discharging the hydraulic oil stored in the tank, an electric motor for driving the pump, a state for generating a right steering assist force, and a state for generating a left steering assist force And an electric switching valve for switching the flow path of the hydraulic oil to the hydraulic actuator, and a steering assist force corresponding to the required steering direction.
- a control device for controlling the switching valve.
- the motor is controlled by the control device such that the pressure of the hydraulic oil discharged from the pump changes in accordance with the determined operation state.
- an electric valve for changing an opening degree in a hydraulic oil flow path between a discharge side of the pump and the tank is provided, and the electric valve is so arranged that a steering assist force changes according to a determined operation state. It is controlled by the control device.
- both the motor and the motor-operated valve may be so controlled by the control device.
- the action direction of the steering assist force can be changed according to the steering direction by switching the flow path of the hydraulic oil by the electric switching valve,
- fine control of the steering assist force is possible by controlling the motor or the electric valve according to the operating state.
- the tank, the pump, the motor, the switching valve, and the control device are integrated so as to be integrally detachable from the hydraulic actuator. Thereby, assembly can be performed efficiently. Also, by connecting the output member of the hydraulic actuator for generating steering assist force to the steering force transmitting member of the manual type steering device, and attaching the integrated tank, pump, motor, switching valve and control device to the hydraulic actuator, The steering device can be made a power steering device.
- the hydraulic actuator includes a right steering assist force generating oil chamber and a left steering assist force generating oil chamber.
- a check valve that regulates the flow of the hydraulic oil from each of the oil chambers to the tank and allows the flow of the hydraulic oil from the tank to each of the oil chambers is disposed in the hydraulic oil flow path between the two. Is preferred.
- the hydraulic oil in the hydraulic actuator is When the oil chamber on the side where oil is supplied becomes negative pressure, hydraulic oil flows into the oil chamber from the tank via the check valve, so that a delay in the operation of the hydraulic actuator can be prevented and steering assist force can be generated quickly. .
- the steering assist force generated by the hydraulic actuator can be finely controlled according to the steering direction and the driving state at a low cost without requiring a complicated structure. It is possible to contribute to the power steering device of the steering device and to obtain a good steering feeling.
- FIG. 1 is an explanatory diagram of a configuration of a power steering unit according to an embodiment of the present invention.
- FIG. 2 is a front view of a hydraulic power steering device including the power steering unit according to the embodiment of the present invention.
- FIG. 3 is a diagram showing an example of a relationship between steering torque, vehicle speed, and hydraulic oil pressure in the power steering unit according to the embodiment of the present invention.
- FIG. 4 is a configuration explanatory view of a power steering unit according to a first modified example of the present invention.
- FIG. 5 is a configuration explanatory view of a power steering unit according to a second modification of the present invention.
- FIG. 6 is a configuration explanatory view of a power steering unit according to a third modification of the present invention.
- Electromagnetic open / close valve (electric valve)
- FIGS. 1 and 2 show a rack-and-pinion type power steering device 1 including a power steering unit according to the present invention, which is connected to a steering shaft 3 connected to a steering wheel 2 of a vehicle via a universal joint 4.
- the input shaft 5 is provided.
- the input shaft 5 is supported by a housing 6 via a bearing (not shown).
- a pinion 7 is connected to the input shaft 5, and wheels are connected to a rack rod 8 formed with rack teeth 8 a engaging with the pinion 7 via tie rods, knuckle arms, and the like, not shown.
- the rotation of the pinion 7 due to the steering of the steering wheel 2 moves the rack rod 8, and the movement of the rack port 8 is transmitted to the wheels so that the steering angle changes.
- the power steering unit includes a hydraulic cylinder 10 as a hydraulic actuator for generating a steering assist force.
- the hydraulic cylinder 10 includes a cylinder 11 formed integrally with the housing 6 so as to cover the rack rod 8, and a piston 12 integrated with the rack rod 8. Between the inner circumference of the cylinder 11 and the outer circumference of the rack rod 8, a right steering assist force generating oil chamber 13 and a left steering assist force generating oil chamber 14 partitioned by a piston 12 are formed. Are sealed by oil seals 15 and 16 between the outer periphery of the rack rod 8 and the inner periphery of the housing 6.
- the hydraulic oil of the hydraulic cylinder 10 is stored in a tank 20, and the hydraulic oil stored in the tank 20 is discharged by a pump 21.
- the pump 21 is configured by, for example, a vane pump, a gear pump, or the like, and is driven by an electric motor 22.
- the hydraulic oil discharged from the pump 21 is sent to the hydraulic cylinder 10 via an electric switching valve 23.
- the switching valve 23 of the present embodiment is a solenoid valve and has a spool 23b displaced by a solenoid 23a, and the spool 23b is selectively positioned at a right steering assist position, a left steering assist position, and a neutral position.
- the spool 23b is located at the right steering assist position, the hydraulic oil is guided from the pump 21 to the right steering assist force generating oil chamber 13 so as to increase the hydraulic pressure, and the hydraulic oil is sent from the left steering assist force generating oil chamber 14.
- the flow path of the hydraulic oil is switched to a state of leading to the tank 20.
- Spool 23b is located at left steering assist position As a result, the hydraulic oil flows from the pump 21 to the left steering assist force generating oil chamber 14 so as to increase the oil pressure, and the hydraulic oil flows from the right steering assist force generating oil chamber 13 to the tank 20. The road is switched. Thus, the state in which the right steering assist force is generated and the state in which the left steering assist force is generated can be selectively selected by switching the flow path of the hydraulic oil by the switching valve 23.
- the spool 23b is located at the neutral position, both the oil chambers 13 and 14 communicate with the tank 20.
- the two oil chambers 13 and 14 of the hydraulic cylinder 10 are connected to each other via a hydraulic oil flow path having a fixed throttle 24 outside the hydraulic cylinder 10.
- the fixed throttle 24 suppresses a sudden change in the steering assist force when the hydraulic oil pressure suddenly changes.
- the hydraulic oil flow path having the fixed throttle 24 may be provided in the piston 12 in the hydraulic cylinder 10, and may not be provided because it is not essential.
- the discharge side of the pump 21 and the tank 20 are connected via a hydraulic oil flow path having a relief valve 31.
- the relief valve 31 closes when the discharge pressure of the pump 21 is lower than the set value, and opens so that the hydraulic oil discharged from the pump 21 is returned to the tank 20 when the discharge pressure is equal to or higher than the set value.
- a tonnole sensor 40 for detecting a steering torque is provided on the input shaft 5.
- the steering direction according to the positive or negative of the output value can be obtained.
- a publicly known torque sensor 40 can be used.
- the torque sensor 40 is also used as means for determining the magnitude of the steering torque as the driving state of the vehicle.
- a vehicle speed sensor 41 is provided as a means for determining the driving state of the vehicle.
- the motor 22, the switching valve 23, the torque sensor 40, and the vehicle speed sensor 41 are connected to the control device 50.
- the tank 20, the pump 21, the motor 22, the switching valve 23, and the control device 50 are integrated so as to be integrally detachable from the hydraulic cylinder 10 with bolts or the like.
- the casing of the control device 50 is mounted on the casing of the motor 22 and the pump 21.
- the casing of the pump 21 is fitted with the casing of the switching valve 23 and the tank 20.
- the rotating shaft of the motor 22 passes through the casing of the control device 50 and is connected to the rotating shaft of the pump 21.
- a hydraulic oil flow path and a fixed throttle 24 are formed in the casing of the switching valve 23.
- the control device 50 controls the switching valve 23 so that a steering assist force according to the steering direction obtained from the positive or negative of the steering torque detected by the torque sensor 40 acts, whereby the electromagnetic force of the solenoid 23a is controlled. As a result, the spool 23b is displaced to the right steering assist position or the left steering assist position. When the steering torque is not detected, the control device 50 displaces the spool 23b to the neutral position. Further, the control device 50 controls the motor 22 so that the pressure of the hydraulic oil discharged from the pump 21 changes according to the magnitude of the steering torque detected by the torque sensor 40 and the vehicle speed detected by the vehicle speed sensor 41. I do. For example, as shown in Fig.
- the drive power of the motor 22 is increased so that the hydraulic oil becomes high pressure and the steering assist force becomes large as the detected vehicle speed is low and the detected steering torque is large.
- the motor 22 is stopped to release the steering assist force, thereby saving energy.
- the operation of the steering assist force according to the steering direction is performed by switching the flow path of the hydraulic oil by the electric switching vanoreb 23.
- the direction can be changed, and fine control of the steering assist force can be performed by controlling the electric motor 22 according to the driving state.
- the tank 20, the pump 21, the motor 22, the switching valve 23 and the control device 50 are integrally and detachably integrated with the hydraulic cylinder 10, the assembling can be performed efficiently.
- the hydraulic cylinder 10 has a negative pressure on the side where the hydraulic oil is supplied in the oil chambers 13 and 14, the hydraulic oil is supplied from the tank 20 to the corresponding chamber in the two check valves 32 and 33. , The operation delay of the hydraulic cylinder 10 can be prevented, and the steering assist force can be quickly generated.
- an electric flow control valve 60 as an electric valve connected to the control device 50 is provided with the two oil chambers 13 of the hydraulic cylinder 10, 14 and the flow control valve 60 is By functioning as such, the opening degree in the hydraulic oil flow path between the pump 21 and the tank 20 can be changed.
- the control device 50 controls the flow control valve 60 together with the motor 22 so that the steering assist force changes according to the determined operating state. For example, when the steering assist force is applied, the control device 50 controls the motor 22 so that the driving power increases as the detected steering torque increases, and the flow control valve 60 controls the detected vehicle speed to a low speed. Control is performed so that the degree of opening of the hydraulic oil passage becomes smaller as much as possible.
- the motor 22 is driven at a constant output by the control device 50, and the flow control valve 60 may be controlled according to the operating state.For example, the magnitude of the detected steering torque is increased. As the detected vehicle speed is lower, the opening degree of the hydraulic oil passage is reduced by the flow control valve 60.
- the electric flow control valve 60 is preferably integrated with the tank 20, the pump 21, the motor 22, the switching valve 23 and the control device 50. Others are the same as the above embodiment.
- an electric valve is provided in the hydraulic oil flow path between each of the oil chambers 13 and 14 and the tank 20.
- An electric flow control valve 60 is provided, and the opening of the hydraulic oil flow path between the pump 21 and the tank 20 can be changed by each flow control valve 60 functioning as a variable throttle.
- the control device 50 controls the motor 22 and the flow control valve 60 connected to the high pressure side in both oil chambers 13 and 14 in the same manner as in the first modification, and the flow control valve 60 connected to the low pressure side is
- the opening degree of the hydraulic oil passage is controlled to be constant, for example, fully open or fully closed. Others are the same as the above embodiment.
- an electromagnetic valve 61 that opens and closes a hydraulic oil passage as an electric valve and a discharge side pressure of the pump 21 are detected.
- the pressure sensor 62 is arranged between the discharge side of the pump 21 and the tank 20, so that the opening degree of the hydraulic oil flow path between the pump 21 and the tank 20 can be changed.
- the electromagnetic opening / closing valve 61 is controlled by the control device 50 so that the discharge side pressure of the pump 21 detected by the pressure sensor 62 does not exceed the set value, so that the electromagnetic opening / closing valve 61 functions as a relief valve. Further, the control device 50 controls the electromagnetic opening and closing valve 61 together with the motor 22 so that the steering assist force changes in accordance with the obtained operating state.
- the control device 50 detects the motor 22 to increase the detected steering torque. Is controlled so that the driving power increases as the pressure increases, and the electromagnetic on-off valve 61 is controlled so that the hydraulic oil discharge pressure of the pump 21 increases as the detection vehicle speed decreases.
- the control device 50 drives the motor 22 with a constant output, and the electromagnetic opening / closing valve 61 may be controlled according to the operating state.For example, the magnitude of the detected steering torque is large.
- the electromagnetic opening / closing valve 61 is controlled such that the lower the detected vehicle speed, the greater the pressure on the discharge side of the pump 21 detected by the pressure sensor 62. Others are the same as the above embodiment.
- the present invention is not limited to the above embodiment.
- the driving state is not limited to the steering torque and the vehicle speed.For example, the steering angle, the steering speed, and the steering acceleration are obtained as the driving conditions. You can control it to make it bigger.
- a steering angle sensor may be provided to determine the steering direction from the detected value.
- the piston rod of a hydraulic cylinder may be connected to a rack of a manual type rack and pinion type steering device.
- the cylinder tube of the hydraulic cylinder is fixed to the vehicle body side, and the integrated tank, pump, electric motor, switching valve and control device are attached to the hydraulic cylinder.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Power Steering Mechanism (AREA)
- Steering Control In Accordance With Driving Conditions (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/569,241 US20060175118A1 (en) | 2003-08-29 | 2004-08-24 | Power steering unit |
EP04772066A EP1659047A4 (en) | 2003-08-29 | 2004-08-24 | POWER STEERING UNIT |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003-306679 | 2003-08-29 | ||
JP2003306679A JP2005075093A (ja) | 2003-08-29 | 2003-08-29 | パワーステアリングユニット |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005021357A1 true WO2005021357A1 (ja) | 2005-03-10 |
Family
ID=34269401
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/012105 WO2005021357A1 (ja) | 2003-08-29 | 2004-08-24 | パワーステアリングユニット |
Country Status (4)
Country | Link |
---|---|
US (1) | US20060175118A1 (ja) |
EP (1) | EP1659047A4 (ja) |
JP (1) | JP2005075093A (ja) |
WO (1) | WO2005021357A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111301520A (zh) * | 2020-03-12 | 2020-06-19 | 洛阳智能农业装备研究院有限公司 | 一种无人农机转向系统 |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4669800B2 (ja) * | 2006-03-09 | 2011-04-13 | 日立オートモティブシステムズ株式会社 | パワーステアリング装置 |
ITBO20060424A1 (it) * | 2006-05-31 | 2007-12-01 | Ferrari Spa | Sistema di sterzatura per una automobile |
JP4961521B2 (ja) * | 2007-01-23 | 2012-06-27 | 日立オートモティブシステムズ株式会社 | パワーステアリング装置 |
US20100018796A1 (en) * | 2008-07-22 | 2010-01-28 | Trw Automotive U.S. Llc | Apparatus for controlling a power-assisted steering gear in response to vehicle conditions |
JP5888546B2 (ja) * | 2011-08-09 | 2016-03-22 | 株式会社ジェイテクト | 油圧式パワーステアリング装置 |
FR2982232B1 (fr) | 2011-11-08 | 2013-11-22 | Jtekt Europe Sas | Valve d'assistance pour direction a assistance hydraulique de vehicule automobile |
JP5910874B2 (ja) | 2012-04-10 | 2016-04-27 | 株式会社ジェイテクト | 油圧式パワーステアリング装置 |
KR20150063766A (ko) * | 2013-12-02 | 2015-06-10 | 주식회사 두산 | 지게차 |
JP6156221B2 (ja) * | 2014-03-26 | 2017-07-05 | 株式会社豊田自動織機 | 産業車両 |
DE102015222864C5 (de) | 2015-11-19 | 2024-03-07 | Volkswagen Aktiengesellschaft | Servosystem und hydraulisches Lenksystem für ein Fahrzeug |
JP6656390B2 (ja) * | 2016-09-20 | 2020-03-04 | クノールブレムゼステアリングシステムジャパン株式会社 | パワーステアリング装置 |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH0655945U (ja) * | 1993-01-20 | 1994-08-02 | 株式会社ユニシアジェックス | パワーステアリングのポンプ装置 |
JPH07228264A (ja) * | 1994-02-18 | 1995-08-29 | Nissan Motor Co Ltd | 電動ポンプ式パワーステアリング装置 |
JPH1111337A (ja) * | 1997-06-20 | 1999-01-19 | Kayaba Ind Co Ltd | 油圧式パワーステアリングにおける制御バルブのコントローラ |
JPH11313466A (ja) * | 1998-04-28 | 1999-11-09 | Shibaura Mechatronics Corp | モータおよびポンプ装置 |
US6419042B1 (en) * | 2000-10-03 | 2002-07-16 | Trw Inc. | Integrated electric power hydraulic steering system |
JP2002347636A (ja) * | 2001-05-28 | 2002-12-04 | Unisia Jkc Steering System Co Ltd | ステアリングダンパ |
JP2003208203A (ja) * | 2001-12-20 | 2003-07-25 | Siemens Ag | マイクロコントローラを有するセーフティクリティカルシステムを制御するための方法 |
Family Cites Families (10)
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JPS5536132A (en) * | 1978-09-01 | 1980-03-13 | Toyota Motor Corp | Power steering for vehicle |
JPS57198169A (en) * | 1981-05-29 | 1982-12-04 | Tokai T R W Kk | Motor-driven oil pressure power steering unit |
GB2158788B (en) * | 1984-05-05 | 1988-01-27 | Trw Cam Gears Ltd | Power assistance steering systems for vehicles |
JP3211434B2 (ja) * | 1991-12-18 | 2001-09-25 | アイシン精機株式会社 | 車輛誘導制御装置 |
US5267627A (en) * | 1992-03-27 | 1993-12-07 | Imra America, Inc. | Vehicle stability augmentation system |
US5320191A (en) * | 1993-01-28 | 1994-06-14 | Kabushiki Kaisha Komatsu Seisakusho | Steering circuit system for a moving vehicle |
JP3339131B2 (ja) * | 1993-09-30 | 2002-10-28 | 豊田工機株式会社 | 動力舵取装置 |
DE19519875C1 (de) * | 1995-05-31 | 1996-07-04 | Daimler Benz Ag | Hydraulische Servosteuerung, insbesondere Servolenkung für Kraftfahrzeuge |
US6173223B1 (en) * | 1999-01-05 | 2001-01-09 | Ford Global Technologies, Inc. | Steering control method for providing variable assist power steering |
JP4215662B2 (ja) * | 2004-03-08 | 2009-01-28 | 株式会社日立製作所 | パワーステアリング装置 |
-
2003
- 2003-08-29 JP JP2003306679A patent/JP2005075093A/ja active Pending
-
2004
- 2004-08-24 EP EP04772066A patent/EP1659047A4/en not_active Withdrawn
- 2004-08-24 US US10/569,241 patent/US20060175118A1/en not_active Abandoned
- 2004-08-24 WO PCT/JP2004/012105 patent/WO2005021357A1/ja active Application Filing
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH0655945U (ja) * | 1993-01-20 | 1994-08-02 | 株式会社ユニシアジェックス | パワーステアリングのポンプ装置 |
JPH07228264A (ja) * | 1994-02-18 | 1995-08-29 | Nissan Motor Co Ltd | 電動ポンプ式パワーステアリング装置 |
JPH1111337A (ja) * | 1997-06-20 | 1999-01-19 | Kayaba Ind Co Ltd | 油圧式パワーステアリングにおける制御バルブのコントローラ |
JPH11313466A (ja) * | 1998-04-28 | 1999-11-09 | Shibaura Mechatronics Corp | モータおよびポンプ装置 |
US6419042B1 (en) * | 2000-10-03 | 2002-07-16 | Trw Inc. | Integrated electric power hydraulic steering system |
JP2002347636A (ja) * | 2001-05-28 | 2002-12-04 | Unisia Jkc Steering System Co Ltd | ステアリングダンパ |
JP2003208203A (ja) * | 2001-12-20 | 2003-07-25 | Siemens Ag | マイクロコントローラを有するセーフティクリティカルシステムを制御するための方法 |
Non-Patent Citations (1)
Title |
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See also references of EP1659047A4 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111301520A (zh) * | 2020-03-12 | 2020-06-19 | 洛阳智能农业装备研究院有限公司 | 一种无人农机转向系统 |
Also Published As
Publication number | Publication date |
---|---|
EP1659047A1 (en) | 2006-05-24 |
JP2005075093A (ja) | 2005-03-24 |
US20060175118A1 (en) | 2006-08-10 |
EP1659047A4 (en) | 2008-12-24 |
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