WO2012144069A1 - 電動パワーステアリング装置 - Google Patents
電動パワーステアリング装置 Download PDFInfo
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- WO2012144069A1 WO2012144069A1 PCT/JP2011/059944 JP2011059944W WO2012144069A1 WO 2012144069 A1 WO2012144069 A1 WO 2012144069A1 JP 2011059944 W JP2011059944 W JP 2011059944W WO 2012144069 A1 WO2012144069 A1 WO 2012144069A1
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- WIPO (PCT)
- Prior art keywords
- steering
- electric power
- assist force
- vehicle
- steering assist
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Classifications
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- 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
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- 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
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- 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
- B62D5/0481—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 monitoring the steering system, e.g. failures
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- 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
- B62D5/0481—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 monitoring the steering system, e.g. failures
- B62D5/0484—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 monitoring the steering system, e.g. failures for reaction to failures, e.g. limp home
Definitions
- the present invention relates to an electric power steering device that assists a steering force by a motor.
- an electric power steering device mounted on a vehicle such as an automobile generates a steering assist force by a motor driven by power supplied from an in-vehicle battery as a main power source, and the steering assist force is transmitted to a steering shaft.
- this electric power steering apparatus is configured to assist the aforementioned steering force when the vehicle is in a driving state.
- the vehicle when an engine stalls due to a red light and an engine cannot be restarted, the vehicle may be moved to a safe place such as a road shoulder. If the vehicle is to be moved, the weight of the vehicle is large, and since the engine is stalled, the steering assist force by the electric power steering device is not generated, so that a very large steering force must be applied to the steering wheel. Accordingly, it is expected that the driver will push the vehicle and move the vehicle to a safe place while steering the steering wheel with great difficulty.
- the conventional electric power steering device generates the steering assist force only by the fact that the steering assist force start condition is not satisfied even though the vehicle-mounted battery has no abnormality and can sufficiently continue the steering assist force. You may be unable to do so.
- the present invention has been made to solve the above-described problems in the conventional electric power steering apparatus.
- the steering assist force start condition is not satisfied and there is no abnormality in the power supply, the steering is performed.
- An object of the present invention is to provide an electric power steering device capable of obtaining an auxiliary force.
- An electric power steering apparatus is a vehicle equipped with a motor that generates an output that applies a steering assist force to a steering system, a power source that supplies electric power to the motor, and a control device that controls the output of the motor.
- the output of the motor is controlled by a driver's operation so as to apply a limited steering assist force that is limited to be smaller than a normal steering assist force to the steering system.
- a limited steering assist force is applied to the steering system when the vehicle is retracted, making the vehicle a safe place. It is possible to reduce the burden on the driver for traveling.
- FIG. 1 is a block diagram showing an electric power steering apparatus according to Embodiment 1 of the present invention.
- a vehicle steering 1 is connected to a rack and pinion mechanism 8 via a steering shaft 2.
- a front wheel 9 which is a steering wheel of the vehicle is connected to a rack and pinion mechanism 8 and is steered by the rack and pinion mechanism 8 based on a steering force applied to the steering 1 by a driver of the vehicle.
- An electric power steering apparatus includes a motor 6 coupled to a steering shaft 2 via a gear 7, and an electric power steering control apparatus (hereinafter referred to as EPS / ECU) 5 for controlling the motor 6. And a torque sensor 3 provided on the steering shaft 2 and a vehicle speed sensor 4 for detecting the vehicle speed.
- the EPS / ECU 5 is supplied with electric power from the in-vehicle battery 10.
- the torque sensor 3 attached to the steering shaft 2 detects the steering torque of the driver who operates the steering 1, and inputs it to the EPS / ECU 5 as a steering torque signal.
- the vehicle speed sensor 4 detects the vehicle speed and inputs it to the EPS / ECU 5 as a vehicle speed signal.
- the EPS / ECU 5 calculates a steering assist force based on the input steering torque signal and the vehicle speed signal, and controls the motor 6 so as to apply the calculated steering assist force to the steering shaft 2 via the gear 7. This is a normal steering assist force applying operation in the electric power steering apparatus.
- FIG. 2 is a flowchart showing the operation of the electric power steering apparatus according to Embodiment 1 of the present invention.
- step S101 it is determined whether or not the steering assist can be applied, that is, whether or not the steering assist force applying condition is satisfied.
- the state that satisfies the steering assist force application condition is, for example, a state in which the engine speed is 1000 [rpm] or more, power is generated by the alternator, and power is sufficiently supplied.
- step S101 If it is determined in step S101 that the steering assist force application condition is satisfied (YES), the steering torque signal that is the output of the torque sensor 1 and the vehicle speed that is the output of the vehicle speed sensor 4 are determined in step S102.
- the signal is taken into the EPS • ECU 5 and the above-described normal steering assist force applying operation is performed.
- step S101 determines whether the steering assist force application condition is not satisfied (NO), such as when the engine stops due to a vehicle failure or fuel shortage (NO)
- the process proceeds to step S103. move on.
- step S103 it is determined whether the power supply relationship such as the battery 10 that supplies power to the EPS / ECU 5 of the electric power steering apparatus and the power supply system is normal, and it is determined that the power supply relationship is not normal. (NO), the steering assist force is stopped in step S106.
- step S104 determines whether there is a request for the save mode. If it is determined in step S104 that there is a request for the contrast mode (YES), the motor 6 is controlled to shift to the retreat mode and apply the limited steering assist force to the steering shaft 2.
- the application of the limited steering assist force is performed, for example, by limiting the motor current to be smaller than normal. As a result, the minimum necessary steering assistance for moving the vehicle to a safe place is ensured, and the burden on the driver can be reduced.
- step S103 If it is determined in step S103 that the power supply relationship is not normal (NO), or if it is determined in step S104 that there is no request for the comparison mode (NO), the process proceeds to step S106, and steering assist is performed. The power is stopped.
- the electric power steering apparatus According to the electric power steering apparatus according to Embodiment 1 of the present invention described above, if the steering assist force application condition is satisfied, the power supply relationship is normal, and there is a request for the retract mode, the limited steering assist force is Therefore, the minimum necessary steering assistance for moving the vehicle to a safe place is ensured, and the burden on the driver can be reduced.
- FIG. 3 is a flowchart showing the operation of the electric power steering apparatus according to Embodiment 2 of the present invention. Steps S101 to S104 and S106 in FIG. 3 are the same as steps S101 to S104 and S106 having the same reference numerals as those in FIG.
- step S101 the condition for applying the steering assist force is not established (NO) in step S101, such as when the vehicle breaks down or the engine does not operate due to lack of fuel (NO). It is determined whether or not the power supply relationship such as the battery 10 that supplies power to the power steering apparatus and the power supply system is normal. If it is determined that the power supply relationship is abnormal (NO), the process proceeds to step S106 and the steering is performed. Stop the auxiliary force.
- step S103 determines whether abnormality in the power supply relationship such as the power supply system (YES). If it is determined in step S103 that there is no abnormality in the power supply relationship such as the power supply system (YES), the process proceeds to step S104, and if it is determined that there is a request for the evacuation mode (YES), step S201 is performed. Transition to evacuation mode. In step S201, the save mode is executed as follows.
- FIG. 4 is an explanatory diagram for explaining the operation of the electric power steering apparatus according to Embodiment 2 of the present invention.
- the horizontal axis indicates the battery voltage VB of the battery 10 as a power source, and the vertical axis indicates the coefficient G.
- the coefficient G corresponding to the battery voltage VB at that time is obtained from the characteristic of the coefficient G with respect to the battery voltage shown in FIG. 4, and the current LimitI is calculated from the following equation (1).
- LimitI Imax ⁇ G Equation (1)
- Imax is a maximum current in a normal state.
- the current supplied to the motor 6 is limited by the coefficient G set in accordance with the battery voltage VB as described above, and a limited steering assist force is applied to the steering shaft 2.
- the electric power steering device for example, even when the battery 10 is deteriorated, a limited steering assist force corresponding to the power supply amount of the battery 10 is generated, A steering assist force for moving the vehicle to a safe place is applied, and the driver's steering operation force can be reduced.
- FIG. 5 is a flowchart showing the operation of the electric power steering apparatus according to Embodiment 3 of the present invention. Steps S101 to S106 in FIG. 5 are the same as steps S101 to S106 having the same reference numerals as those in FIG.
- step S211 when it is determined in step S104 that there is a request for the evacuation mode (YES), it is determined in step S211 whether or not the application of the steering assist force is within a predetermined time. Do. As a result of the determination in step S211, if it is determined that it is within the predetermined time (YES), the limited steering assist force is applied in step S105, and if it is determined that it is not within the predetermined time (NO). Then, the process proceeds to step S106, and the application of the steering assist force is stopped.
- the limited steering assist force is applied when the steering assist force is applied within a predetermined time. Even when the vehicle moves again without causing malfunction, it is possible to extend the time for supplying power to the electric power steering apparatus.
- FIG. 6 is a flowchart showing the operation of the electric power steering apparatus according to Embodiment 4 of the present invention. Steps S101 to S104 and S106 in FIG. 6 are the same as steps S101 to S104 and S106 having the same reference numerals as those in FIG.
- the steering assist force is not much in the evacuation mode. Since this is not necessary, the steering assist force map used at high speed is used.
- FIG. 7 is an explanatory diagram for explaining the operation of the electric power steering apparatus according to Embodiment 4 of the present invention.
- a steering assist force map as shown in FIG. 7 stored in the EPS / ECU 5 is used to apply the steering assist force according to the vehicle speed. . Therefore, when it is determined in FIG. 6 that there is a request for the evacuation mode in step S104 (YES), in step S221, the steering assist force is a high-speed steering assist force map shown in FIG. This is fixed to the steering assist force map at a vehicle speed of 200 [km / h].
- the steering assist force map is fixed to the steering assist force map used at a high speed that does not require much steering assist force.
- FIG. 8 is a flowchart showing the operation of the electric power steering apparatus according to Embodiment 5 of the present invention. Steps S101 to S103, S105, and S106 in FIG. 8 are the same as steps S101 to S103, S105, and S106 having the same reference numerals as those in FIG.
- step S101 when it is determined in step S101 that the engine is stopped and the steering assist force application condition is not satisfied (NO), it is determined in step S102 that the power supply relationship is normal. (YES), it is determined in step S301 whether or not the engine restart operation has been performed a plurality of times within a predetermined time. If it is determined that the restart operation has been performed a plurality of times (YES), step S105 is performed. Proceed to to apply limited steering assist force.
- step S301 determines whether the engine restart operation has been performed a plurality of times (NO) or not been performed a plurality of times (NO).
- FIG. 9 is a flowchart showing the operation of the electric power steering apparatus according to Embodiment 6 of the present invention. Steps S101 to S103, S105, and S106 in FIG. 9 are the same as steps S101 to S103, S105, and S106 having the same reference numerals as those in FIG.
- step S101 when it is determined in step S101 that the engine is stopped and the steering assist force application condition is not satisfied (NO), it is determined in step S103 that the power supply relationship is normal. If it is determined (YES), it is determined in step S401 whether or not the steering wheel has been steered a plurality of times 90 degrees or more. If it is determined that the steering wheel has been steered a plurality of times 90 degrees or more (YES), the process proceeds to step S105 to limit Applies steering assist force.
- step S401 determines whether the steering wheel has been steered a plurality of times by 90 degrees or more (NO). If it is determined in step S401 that the steering wheel has not been steered a plurality of times by 90 degrees or more (NO), the process proceeds to step S106 and the application of the steering assist force is stopped.
- FIG. 10 is a flowchart showing the operation of the electric power steering apparatus according to Embodiment 7 of the present invention. Steps S101 to S103, S105, and S106 in FIG. 10 are the same as steps S101 to S103, S105, and S106 having the same reference numerals as those in FIG.
- a save mode request switch is provided, and the presence / absence of a request for the save mode is determined based on ON / OFF of the save mode request switch. That is, in FIG. 10, when it is determined in step S101 that the engine is stopped and the steering assist force application condition is not satisfied (NO), it is determined in step S103 that the power supply relationship is normal. If (YES), it is determined in step S501 whether the retraction mode request switch is ON or OFF, and if it is determined that the retraction mode request switch is ON (YES), the process proceeds to step S105 to apply limited steering assist force. To do.
- step S501 determines that the steering wheel is not steered a plurality of times by 90 degrees or more (NO)
- the process proceeds to step S106, and the application of the steering assist force is stopped.
- the save mode request switch may use a signal such as in-vehicle communication other than the switch by hardware.
- a signal indicating that the evacuation mode request switch is ON can be input to the EPS / ECU 5 to recognize that there is an evacuation mode request. This makes it possible to clarify the intention of the evacuation mode request and to avoid entering the evacuation mode inadvertently.
- the present invention can be used in the field of the automobile industry, particularly in the field of electric power steering devices for automobiles.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
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Abstract
Description
以下、この発明の実施の形態1による電動パワーステアリング装置について、図面に基づいて説明する。図1は、この発明の実施の形態1による電動パワーステアリング装置を示す構成図である。図1に於いて、車両のステアリング1は、ステアリングシャフト2を介してラックアンドピニオン機構8に連結されている。車両の操舵輪である前輪9は、ラックアンドピニオン機構8に連結されており、車両の運転者によりステアリング1に加えられた操舵力に基づいてラックアンドピニオン機構8により操舵される。
次に、この発明の実施の形態2による電動パワーステアリング装置について説明する。図3は、この発明の実施の形態2による電動パワーステアリング装置の動作を示すフローチャートである。図3に於けるステップS101~S104、S106は、図2に於けるそれらと同符号のステップS101~S104、S106と同一である。
LimitI=Imax×G・・・・・・・・・・式(1)
ここに、Imaxは、正常時の最大電流である。
次に、この発明の実施の形態3による電動パワーステアリング装置について説明する。図5は、この発明の実施の形態3による電動パワーステアリング装置の動作を示すフローチャートである。図5に於けるステップS101~S106は、図2に於けるそれらと同符号のステップS101~S106と同一である。
次に、この発明の実施の形態4による電動パワーステアリング装置について説明する。図6は、この発明の実施の形態4による電動パワーステアリング装置の動作を示すフローチャートである。図6に於けるステップS101~S104、S106は、図2に於けるそれらと同符号のステップS101~S104、S106と同一である。
次に、この発明の実施の形態5による電動パワーステアリング装置について説明する。図8は、この発明の実施の形態5による電動パワーステアリング装置の動作を示すフローチャートである。図8に於けるステップS101~S103、S105、S106は、図2に於けるそれらと同符号のステップS101~S103、S105、S106と同一である。
次に、この発明の実施の形態6による電動パワーステアリング装置について説明する。図9は、この発明の実施の形態6による電動パワーステアリング装置の動作を示すフローチャートである。図9に於けるステップS101~S103、S105、S106は、図2に於けるそれらと同符号のステップS101~S103、S105、S106と同一である。
次に、この発明の実施の形態7による電動パワーステアリング装置について説明する。図10は、この発明の実施の形態7による電動パワーステアリング装置の動作を示すフローチャートである。図10に於けるステップS101~S103、S105、S106は、図2に於けるそれらと同符号のステップS101~S103、S105、S106と同一である。
4 車速センサ、5 EPS・ECU、6 モータ、7 ギア、
8 ラックアンドピニオン機構、9 車輪、10 バッテリ
Claims (8)
- ステアリング系に操舵補助力を付与する出力を発生するモータと、前記モータに電力を供給する電源と、前記モータの出力を制御する制御装置とを備えた車両の電動パワーステアリング装置であって、
前記制御装置は、運転者の操作によって、通常時の操舵補助力よりも小さく制限された制限付き操舵補助力を前記ステアリング系に付与するように前記モータの出力を制御する、
ことを特徴とする電動パワーステアリング制御装置。 - 前記制限付き操舵補助力の付与は、前記制御装置により前記電源から前記モータへ供給する電流を通常時より制限することにより行なわれる、
ことを特徴とする請求項1に記載の電動パワーステアリング装置。 - 前記制御装置による前記電流の制限は、前記電源の電圧に応じた係数を通常時のモータ電流に乗算することに基づいて行なわれる、
ことを特徴とする請求項2に記載の電動パワーステアリング装置。 - 前記制限付き操舵補助力の付与は、所定時間内に行なわれる、
ことを特徴とする請求項1に記載の電動パワーステアリング装置。 - 前記制限付き操舵補助力の付与は、前記制御装置内に保持されている高速走行時の操舵保持力のデータに基づいて行なわれる、
ことを特徴とする請求項1に記載の電動パワーステアリング装置。 - 前記車両のエンジンの再始動操作が複数回行なわれたとき、前記車両の退避時であると判定する、
ことを特徴とする請求項1乃至5のうちの何れか一項に記載の電動式パワーステアリング装置。 - 前記車両のハンドルが所定角度以上に複数回操舵されたとき、前記車両の退避時であると判定する、
ことを特徴とする請求項1乃至5のうちの何れか一項に記載の電動式パワーステアリング装置。 - 車両の退避時に操作されるスイッチを備え、
前記スイッチが前記退避時に操作されたとき、前記車両の退避時であると判定する、
ことを特徴とする請求項1乃至5のうちの何れか一項に記載の電動式パワーステアリング装置。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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CN201180064559.5A CN103298685B (zh) | 2011-04-22 | 2011-04-22 | 电动力转向装置 |
US13/991,082 US9567001B2 (en) | 2011-04-22 | 2011-04-22 | Electric power steering apparatus |
EP11864113.3A EP2700563B1 (en) | 2011-04-22 | 2011-04-22 | Electric power steering device |
JP2013510809A JP5518256B2 (ja) | 2011-04-22 | 2011-04-22 | 電動パワーステアリング装置 |
PCT/JP2011/059944 WO2012144069A1 (ja) | 2011-04-22 | 2011-04-22 | 電動パワーステアリング装置 |
Applications Claiming Priority (1)
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PCT/JP2011/059944 WO2012144069A1 (ja) | 2011-04-22 | 2011-04-22 | 電動パワーステアリング装置 |
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US (1) | US9567001B2 (ja) |
EP (1) | EP2700563B1 (ja) |
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WO2014073339A1 (ja) * | 2012-11-09 | 2014-05-15 | 日産自動車株式会社 | 車両制御装置 |
JP2016019449A (ja) * | 2014-07-11 | 2016-02-01 | 株式会社デンソー | モータ制御装置およびそれを用いた電動パワーステアリング装置 |
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US10589778B2 (en) * | 2018-01-15 | 2020-03-17 | Ford Global Technologies, Llc | Method and system for active steering for start-stop events |
JP7120075B2 (ja) * | 2019-02-26 | 2022-08-17 | トヨタ自動車株式会社 | 車両の制御装置 |
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- 2011-04-22 US US13/991,082 patent/US9567001B2/en not_active Expired - Fee Related
- 2011-04-22 EP EP11864113.3A patent/EP2700563B1/en not_active Not-in-force
- 2011-04-22 CN CN201180064559.5A patent/CN103298685B/zh not_active Expired - Fee Related
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Also Published As
Publication number | Publication date |
---|---|
US9567001B2 (en) | 2017-02-14 |
CN103298685B (zh) | 2018-06-26 |
EP2700563A4 (en) | 2015-09-23 |
JP5518256B2 (ja) | 2014-06-11 |
US20130253766A1 (en) | 2013-09-26 |
JPWO2012144069A1 (ja) | 2014-07-28 |
EP2700563B1 (en) | 2017-03-01 |
EP2700563A1 (en) | 2014-02-26 |
CN103298685A (zh) | 2013-09-11 |
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