WO2014166313A1 - Véhicule à nouvelles énergies et système de direction assistée hydraulique-électrique de conduite hybride de celui-ci - Google Patents

Véhicule à nouvelles énergies et système de direction assistée hydraulique-électrique de conduite hybride de celui-ci Download PDF

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Publication number
WO2014166313A1
WO2014166313A1 PCT/CN2014/072221 CN2014072221W WO2014166313A1 WO 2014166313 A1 WO2014166313 A1 WO 2014166313A1 CN 2014072221 W CN2014072221 W CN 2014072221W WO 2014166313 A1 WO2014166313 A1 WO 2014166313A1
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WO
WIPO (PCT)
Prior art keywords
oil
power steering
auxiliary
main
storage tank
Prior art date
Application number
PCT/CN2014/072221
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English (en)
Chinese (zh)
Inventor
李振山
黄彬伟
黄建
陈慧勇
彭能岭
Original Assignee
郑州宇通客车股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
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Application filed by 郑州宇通客车股份有限公司 filed Critical 郑州宇通客车股份有限公司
Publication of WO2014166313A1 publication Critical patent/WO2014166313A1/fr

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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
    • B62D5/30—Safety devices, e.g. alternate emergency power supply or transmission means to ensure steering upon failure of the primary steering means

Definitions

  • the present invention relates to a new energy vehicle and a hybrid-driven electrohydraulic power steering system thereof. Background technique
  • the electro-hydraulic power steering system or EHPS for short, is widely used in new energy vehicles, especially pure electric vehicles and deep hybrid vehicles.
  • the power steering system used in the traditional new energy bus is a single-steering motor single-pump structure, that is, the steering assist of the vehicle is completely provided by a steering motor.
  • Chinese patent CN102424068A discloses an automobile hydraulic electric power steering system, which comprises a hydraulic pump and a motor for driving the hydraulic pump.
  • the oil inlet of the hydraulic pump is connected with the oil storage tank, and the oil outlet of the hydraulic pump passes through a one-way valve.
  • the accumulator Connected to the accumulator, the accumulator is connected to the steering assist cylinder, and the steering assist cylinder is connected to the accumulator.
  • the working principle of the system is that the control device is used to set the pressure control threshold in the collected hydraulic accumulator to the range value, and according to the preset condition, determine to output an appropriate control signal to the motor to control the starting and stopping of the motor, specifically
  • the preset conditions are as follows: The required oil pressure threshold is calculated in real time according to the vehicle speed signal and the steering wheel angle signal, and the required oil pressure threshold and the oil pressure in the accumulator are compared, and the judgment result of whether or not the control signal is output is obtained.
  • the control unit If the comparison result is lower than the lower limit value, the pressure in the hydraulic accumulator is low, and the control unit outputs a control command to start the motor and the hydraulic pump to provide high-pressure oil for the steering assist cylinder; if the comparison result is higher than the upper limit To characterize the high pressure in the hydraulic accumulator, the control unit outputs a control command to stop the motor and the hydraulic pump from operating. Since the system adopts a single-steer motor single-pump structure, in the actual operation of the vehicle, once the motor or oil circuit fails or fails, it cannot provide steering assist to the steering assist cylinder, especially when the vehicle is running at high speed, the steering assist disappears. The danger is even greater, and even the car is ruined.
  • the hybrid-driven electrohydraulic power steering system of the present invention adopts the following technical solutions:
  • the hybrid-driven electro-hydraulic power steering system includes a storage tank and a power steering gear, and a main hydraulic unit for providing a main drive hydraulic pressure to the power steering gear between the oil storage tank and the power steering gear, and the main hydraulic unit includes a series connection in series a main hydraulic pump and a main check valve on the oil passage between the oil outlet of the oil tank and the oil inlet of the power steering gear, the main hydraulic pump is driven by the main driving device, and the main check valve and the power steering device are arranged There is a tee, the oil outlet of the tee is connected with the oil inlet of the power steering, the main check valve is arranged at one oil inlet of the tee; the oil tank and the power steering device are also provided with a boost
  • the steering gear provides an auxiliary hydraulic unit for assisting driving hydraulic pressure, and the auxiliary hydraulic unit includes an auxiliary hydraulic pump and an auxiliary check valve which are sequentially connected
  • An overflow valve is connected in series with the oil passage between the three-way oil outlet and the oil inlet of the power steering gear, and the oil outlet of the overflow valve is connected with the oil inlet of the power steering, and the overflow port is connected with the oil storage tank. .
  • the main drive device is an automotive main motor
  • the auxiliary drive device is an auxiliary steering motor.
  • the new energy vehicle of the present invention adopts the following technical solutions:
  • a new energy vehicle including a frame and an electrohydraulic power steering system mounted on the frame, the system including an oil storage tank and a power steering, an oil storage tank and a power steering
  • the one-way valve, the main hydraulic pump is driven by the main driving device, the three-way is arranged between the main check valve and the power steering, the oil outlet of the three-way is connected with the oil inlet of the power steering, and the main check valve is set At an oil inlet of the tee; an auxiliary hydraulic unit for providing auxiliary driving hydraulic pressure to the power steering gear is further disposed between the oil storage tank and the power steering gear, and the auxiliary hydraulic unit comprises another series of oil storage tanks connected in series Auxiliary hydraulic pump and auxiliary check valve on the oil passage between the oil port and the other oil inlet of the tee, the auxiliary hydraulic pump is driven by the auxiliary drive device, and the auxiliary check valve is set in the three-way Should the oil inlet.
  • An overflow valve is connected in series with the oil passage between the three-way oil outlet and the oil inlet of the power steering gear, and the oil outlet of the overflow valve is connected with the oil inlet of the power steering, and the overflow port is connected with the oil storage tank. .
  • the main drive device is an automotive main motor
  • the auxiliary drive device is an auxiliary steering motor.
  • the electric hydraulic power steering system adopting the above structure, since the auxiliary hydraulic unit and the tee are added in addition to the main hydraulic unit in the system, the two hydraulic units are connected through the three-way and the power steering, so that the main hydraulic unit is assisted.
  • Steering gear provides main drive hydraulics, as well as auxiliary hydraulics
  • the auxiliary drive hydraulic pressure is provided for the power steering gear, and the three-way ensures that the driving hydraulic pressure provided by the two hydraulic units meets in the three-way, and together provides the driving hydraulic pressure for the power steering.
  • the power steering device is assisted by two driving hydraulic pressures, that is, the main driving device works under normal conditions, the main hydraulic pump provides power for the power steering device; when the main driving device is not working, the auxiliary driving device Working, the auxiliary hydraulic pump assists the power steering; when the main drive and the auxiliary drive work simultaneously, it provides a synergy for the power steering. Therefore, the main hydraulic unit of the whole system is used as the first power source, and the auxiliary hydraulic unit is used as the second power source. When the first power source fails or fails, the second power source ensures the power steering demand of the power steering gear. The reliability and safety of the steering system and the new energy vehicles using the system prevent accidents in the vehicle.
  • FIG. 1 is a schematic structural view of an electrohydraulic power steering system according to the present invention.
  • FIG. 1 An embodiment of the electro-hydraulic power steering system of the present invention: as shown in FIG. 1 , comprising an oil storage tank 3 , a power steering gear 5 and a tee 8 , the oil storage tank 3 has two oil outlets and a oil return port, and the power is assisted
  • the diverter 5 has an oil inlet port and an oil outlet port
  • the tee 8 has two oil inlet ports and one oil outlet port, wherein one of the three-way oil inlet port is a main oil inlet port and the other is an auxiliary oil inlet port;
  • One of the oil outlets of the oil storage tank 3 is connected with the three-way main oil inlet port, and the other oil outlet port is connected with the three-way auxiliary oil inlet port, and the power steering oil inlet port is connected with the three-way oil outlet port, and the oil outlet port is connected.
  • a main hydraulic unit is disposed between the three-way main oil inlet and the corresponding oil storage tank outlet, and the main hydraulic unit includes a main hydraulic pump 4 and a main check valve 7 which are sequentially connected in series on the corresponding oil passage, and the main hydraulic pump 4
  • the transmission belt 2 is connected with the main motor 1 of the automobile, the main motor 1 is the main driving device, and the main check valve 7 is arranged at the main oil inlet of the three-way, under the action of the main motor 1 and the main check valve 7,
  • the hydraulic pump 4 provides a main drive hydraulic pressure for the power steering gear 5; an auxiliary hydraulic unit is provided between the three-way auxiliary oil inlet and the corresponding oil storage port outlet, and the auxiliary hydraulic unit includes an auxiliary hydraulic pressure serially connected in series on the corresponding oil passage.
  • the pump 10 and the auxiliary check valve 9, the auxiliary hydraulic pump 10 and the auxiliary steering motor 11 are drivingly connected, the auxiliary steering motor 11 is an auxiliary driving device, and the auxiliary check valve 9 is disposed at the three-way auxiliary oil inlet, in the auxiliary steering motor 11
  • the auxiliary hydraulic pump provides auxiliary drive hydraulic pressure to the power steering gear 5 under the action of the auxiliary check valve 9.
  • the hydraulic oil passing through the main hydraulic pump 4 becomes high pressure oil, and the high pressure oil is passed through.
  • the main check valve 7 and the three-way valve 8 enter the power steering device 5 to operate the power steering device 5, and the main check valve 7 prevents the high-pressure oil from passing backwards; when the auxiliary steering motor 11 is in operation, the auxiliary hydraulic pump 10 is passed.
  • the hydraulic oil becomes high-pressure oil, and the high-pressure oil enters the power steering device 5 via the auxiliary check valve 9 and the three-way 8 to make the power steering device 5 work, and the auxiliary check valve 9 is used to prevent the high-pressure oil from flowing backward; when the main motor 1 When the auxiliary motor 11 is working at the same time, the two high-pressure oils meet in the tee 8 and then enter the power steering device 5 to make the power steering work.
  • an overflow valve 6 is connected in series between the oil outlet of the three-way oil outlet and the oil inlet of the power steering, and the oil outlet of the overflow valve is connected with the oil inlet of the power steering, the overflow port and the oil storage.
  • the tank is connected so as to ensure that the pressure of the high pressure oil entering the power steering gear 5 by the tee 8 is constant.
  • the specific working principle of the above embodiment is as follows: The system is applied to a new energy vehicle. Since the main driving device is the main motor 1 of the automobile, the working state of the main hydraulic pump 4 and the auxiliary hydraulic pump 10 is related to the working state of the automobile, that is, when the vehicle When the original steering, reverse and coasting feedback, the main motor 1 does not rotate or reverse, the auxiliary steering motor 11 works, only the auxiliary hydraulic pump 10 provides steering assist to the power steering 5; when the vehicle advances at low speed, the main motor 1 rotates forward. When the rotational speed is lower than the rotational speed threshold, the assist provided by the main hydraulic pump 4 cannot meet the steering demand.
  • the auxiliary steering motor 11 also works, and the power steering gear 5 obtains the resultant force; when the vehicle advances at a high speed, the main motor 1 rotates at the forward speed. Above the speed threshold, the assist provided by the main hydraulic pump 4 satisfies the steering demand, and the auxiliary steering motor 11 stops operating.
  • the primary drive can also be the engine of a car.
  • the embodiment of the new energy vehicle of the present invention comprises: a frame and an electrohydraulic power steering system mounted on the frame.
  • the structure of the system is as shown in FIG. 1 , which is consistent with the structure of the electrohydraulic power steering system of the above embodiment. The content thereof will not be described here.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Power Steering Mechanism (AREA)

Abstract

L'invention concerne un véhicule à nouvelles énergies et son système de direction assistée hydraulique-électrique de conduite hybride. Dans le système, une unité hydraulique principale est agencée entre un réservoir de stockage d'huile (3) et un dispositif de direction assistée (5), et comporte une pompe hydraulique principale (4) et un clapet de non-retour principal (7). La pompe hydraulique principale est entraînée par un dispositif d'entraînement principal (1) ; un joint en T (8) est agencé entre le clapet de non-retour principal et le dispositif de direction assistée ; une sortie d'huile du joint en T est raccordée à une admission d'huile du dispositif de direction assistée. Une unité hydraulique auxiliaire est agencée entre le réservoir de stockage d'huile et le dispositif de direction assistée, et comporte une pompe hydraulique auxiliaire (10) et un clapet de non-retour auxiliaire (9). La pompe hydraulique auxiliaire est entraînée par un dispositif d'entraînement auxiliaire (11), et le clapet de non-retour auxiliaire est agencé de manière correspondante au niveau de l'admission d'huile du joint en T. L'unité hydraulique principale du système tient lieu de première source d'assistance, et l'unité hydraulique auxiliaire tient lieu de deuxième source d'assistance. En cas d'anomalie ou de panne de la première source d'assistance, la deuxième source d'assistance peut encore satisfaire l'exigence d'assistance du dispositif de direction assistée, de telle sorte que la fiabilité et la sécurité du système de direction et du véhicule à nouvelles énergies utilisant le système sont améliorées.
PCT/CN2014/072221 2013-04-08 2014-02-19 Véhicule à nouvelles énergies et système de direction assistée hydraulique-électrique de conduite hybride de celui-ci WO2014166313A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN 201320170972 CN203158069U (zh) 2013-04-08 2013-04-08 新能源汽车及其混合驱动的电动液压助力转向系统
CN201320170972.6 2013-04-08

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WO2014166313A1 true WO2014166313A1 (fr) 2014-10-16

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108657266A (zh) * 2017-03-31 2018-10-16 宝沃汽车（中国）有限公司 车辆转向助力系统与方法以及电驱动车辆
US20220135122A1 (en) * 2020-10-30 2022-05-05 Dana Belgium N.V. Vehicle steering system

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203158069U (zh) * 2013-04-08 2013-08-28 郑州宇通客车股份有限公司 新能源汽车及其混合驱动的电动液压助力转向系统
CN105370531B (zh) * 2015-11-13 2017-10-24 湖南南车时代电动汽车股份有限公司 一种行车安全系统
CN109724808B (zh) * 2017-10-27 2021-03-23 湖南中车时代电动汽车股份有限公司 一种安全辅助系统可靠性测试装置
CN211494217U (zh) * 2019-10-30 2020-09-15 东风特汽(十堰)客车有限公司 防掉高压转向辅助装置
CN114248839B (zh) * 2022-01-26 2023-04-14 湖南三一中型起重机械有限公司 车辆应急转向液压系统及作业车辆

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US20060175119A1 (en) * 2005-01-27 2006-08-10 Trw Automotive U.S. Llc Power steering apparatus
WO2012014004A1 (fr) * 2010-07-28 2012-02-02 Renault Trucks Système de direction assistée pour un véhicule
CN202193115U (zh) * 2011-08-15 2012-04-18 烟台海德专用汽车有限公司 一种混合动力汽车用双泵液压助力转向装置
CN202703683U (zh) * 2012-08-01 2013-01-30 福建省福工动力技术股份公司 一种混合动力助力转向装置
CN103192872A (zh) * 2013-04-08 2013-07-10 郑州宇通客车股份有限公司 混合驱动的电动液压助力转向系统及其控制方法
CN203158069U (zh) * 2013-04-08 2013-08-28 郑州宇通客车股份有限公司 新能源汽车及其混合驱动的电动液压助力转向系统

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060175119A1 (en) * 2005-01-27 2006-08-10 Trw Automotive U.S. Llc Power steering apparatus
WO2012014004A1 (fr) * 2010-07-28 2012-02-02 Renault Trucks Système de direction assistée pour un véhicule
CN202193115U (zh) * 2011-08-15 2012-04-18 烟台海德专用汽车有限公司 一种混合动力汽车用双泵液压助力转向装置
CN202703683U (zh) * 2012-08-01 2013-01-30 福建省福工动力技术股份公司 一种混合动力助力转向装置
CN103192872A (zh) * 2013-04-08 2013-07-10 郑州宇通客车股份有限公司 混合驱动的电动液压助力转向系统及其控制方法
CN203158069U (zh) * 2013-04-08 2013-08-28 郑州宇通客车股份有限公司 新能源汽车及其混合驱动的电动液压助力转向系统

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108657266A (zh) * 2017-03-31 2018-10-16 宝沃汽车（中国）有限公司 车辆转向助力系统与方法以及电驱动车辆
US20220135122A1 (en) * 2020-10-30 2022-05-05 Dana Belgium N.V. Vehicle steering system

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