WO2014166314A1 - 混合驱动的电动液压助力转向系统及其控制方法 - Google Patents

混合驱动的电动液压助力转向系统及其控制方法 Download PDF

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Publication number
WO2014166314A1
WO2014166314A1 PCT/CN2014/072222 CN2014072222W WO2014166314A1 WO 2014166314 A1 WO2014166314 A1 WO 2014166314A1 CN 2014072222 W CN2014072222 W CN 2014072222W WO 2014166314 A1 WO2014166314 A1 WO 2014166314A1
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Prior art keywords
auxiliary
main
hydraulic pump
power steering
oil
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PCT/CN2014/072222
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English (en)
French (fr)
Inventor
李振山
黄彬伟
黄建
彭能岭
汤望
高云庆
张春敏
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郑州宇通客车股份有限公司
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Publication of WO2014166314A1 publication Critical patent/WO2014166314A1/zh

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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
    • B62D5/06—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
    • 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
    • B62D5/062—Details, component parts
    • B62D5/063—Pump driven by vehicle engine
    • 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
    • B62D5/062—Details, component parts
    • B62D5/064—Pump driven independently from vehicle engine, e.g. electric driven pump

Definitions

  • the invention relates to a hybrid driven electrohydraulic power steering system and a control method thereof.
  • the electro-hydraulic power steering system referred to as EHPS
  • EHPS electro-hydraulic power steering system
  • the power steering system used in the traditional new energy bus is a single hydraulic drive, that is, the power steering pump is assisted by a hydraulic pump, and the hydraulic pump is driven by the automobile engine. Once the engine is stopped or reversed, the steering oil pump and the power steering device are also As soon as the work stops, the steering of the steering wheel becomes heavy and cannot meet the needs of the stop or reverse steering of the passenger car.
  • Chinese patent CN202193115U discloses a dual-pump hydraulic power steering device for a hybrid vehicle, which has two parallel oil passages between the oil storage tank and the power steering gear, one of which has a main hydraulic unit on the parallel oil circuit, and another An auxiliary hydraulic unit is provided on a parallel oil circuit.
  • the main hydraulic unit includes a main hydraulic pump connected in series on the corresponding oil passage, and the main hydraulic pump is driven by the automobile engine;
  • the auxiliary hydraulic unit includes an auxiliary hydraulic pump connected in series on the corresponding oil passage, and the auxiliary hydraulic pump is driven by the auxiliary steering motor.
  • a shuttle valve is arranged between the main hydraulic pump and the auxiliary hydraulic pump, and the two oil inlets of the shuttle valve are respectively connected with the oil outlets of the main hydraulic pump and the auxiliary hydraulic pump, and the oil outlet of the shuttle valve and the power steering gear The oil inlet is connected.
  • the device uses the main hydraulic unit and the auxiliary hydraulic unit to simultaneously supply the driving hydraulic pressure to the power steering gear.
  • the auxiliary steering motor and the auxiliary hydraulic pump provide power for the power steering, but the two hydraulic units correspond to
  • the high-pressure oil passage is connected to the power steering through the shuttle valve, and the shuttle valve can only ensure that the oil passage on the higher oil pressure side is turned on, that is, when the oil pressure outputted by the main hydraulic pump is greater than the oil pressure output from the auxiliary hydraulic pump, Only the main hydraulic pump provides power for the power steering, but the auxiliary steering motor continues to run, and the flow of the auxiliary hydraulic pump is wasted, causing waste of energy output from the auxiliary hydraulic pump; when the hydraulic pressure output from the main hydraulic pump is smaller than the auxiliary hydraulic pump When the oil pressure is output, only the auxiliary hydraulic pump provides power for the power steering, but the engine continues to run, and the flow of the main hydraulic pump is white. The cost is lost, resulting in wasted energy output from the engine.
  • the present invention also provides a control method of the system.
  • a control method of a hybrid-driven electrohydraulic power steering system includes a main hydraulic unit and an auxiliary hydraulic unit, wherein The main hydraulic pump of the main hydraulic unit is driven by the main motor of the vehicle, and the auxiliary hydraulic pump of the auxiliary hydraulic unit is driven by the auxiliary steering motor; the main controller of the main hydraulic unit measures the flow S1 of the main hydraulic pump in real time, and the measurement result is real-time.
  • the auxiliary controller is fed back to the auxiliary hydraulic unit, and the auxiliary controller controls the auxiliary hydraulic pump output flow S2 according to the result of the feedback, S2 ⁇ P-Sl, P is a constant flow required for the power steering work.
  • the main controller measures the flow rate of the main hydraulic pump by measuring the rotational speed of the main motor of the automobile, and the auxiliary controller controls the flow rate of the auxiliary hydraulic pump by controlling the rotational speed of the auxiliary steering motor.
  • the hybrid-driven electrohydraulic power steering system of the present invention adopts the following technical solution:
  • a hybrid-driven electrohydraulic power steering system implementing the above control method including an oil storage tank and a power steering, between the oil storage tank and the power steering
  • the main hydraulic unit and the auxiliary hydraulic unit are arranged in parallel, and the main hydraulic unit comprises a main hydraulic pump and a main check valve which are sequentially connected in series on the corresponding parallel oil circuit, the main hydraulic pump is driven by the main motor of the automobile, and the auxiliary hydraulic unit comprises serially connected in parallel in parallel.
  • the valve and the auxiliary check valve are connected one by one, and an overflow valve is connected in series with the oil passage between the oil outlet of the three-way and the oil inlet of the power steering, and the oil outlet of the overflow valve and the power steering
  • the port connection and the overflow port are connected to the oil storage tank;
  • the main hydraulic unit further includes a main controller for measuring the flow rate of the main hydraulic pump output, and the auxiliary hydraulic pressure
  • the unit also includes an auxiliary controller coupled to the main controller for controlling the magnitude of the main hydraulic pump output flow.
  • the main controller measures the flow rate of the main hydraulic pump by measuring the rotational speed of the main motor of the automobile.
  • the auxiliary hydraulic pump is driven by an auxiliary steering motor, and the auxiliary controller controls the flow of the auxiliary hydraulic pump output by controlling the auxiliary steering motor.
  • the electrohydraulic power steering system of the above configuration since a tee is provided between the main check valve of the main hydraulic unit and the auxiliary check valve of the auxiliary hydraulic unit, the two parallel high pressure oil passages are performed at the three-way position.
  • the hydraulic pumps on the two oil lines not only can independently assist the power steering, but also provide the synergy between the two; and the overflow valve between the three-way and the power steering can ensure the input to the power steering
  • the flow rate is within a certain range, preventing the flow into the power steering device from being excessive and causing damage to the power steering; more importantly, the main controller measures the main hydraulic pump output flow in real time, and the auxiliary controller is based on the feedback from the main controller. The result controls the corresponding output flow of the auxiliary hydraulic pump, and adjusts the flow output of the auxiliary hydraulic pump in real time according to the output flow of the main hydraulic pump, so that the assistance of the two hydraulic units can be well taken to prevent energy waste.
  • FIG. 1 is a schematic structural view of an electrohydraulic power steering system according to the present invention.
  • FIG. 1 An embodiment of the electrohydraulic power steering system of the present invention: as shown in FIG. 1, comprising an oil storage tank 3 and a power steering gear 5, the oil storage tank 3 has two oil outlets and one oil return port, and the power steering gear 5 has An oil inlet and an oil outlet, the oil outlet of the power steering 5 is connected to the oil return port of the oil storage tank 3; between the two oil outlets of the oil storage tank 3 and the oil inlet of the power steering gear 5 There are two parallel oil circuits, one of which has a main hydraulic unit on the parallel oil circuit and the other parallel oil circuit with an auxiliary hydraulic unit.
  • the main hydraulic unit comprises a main hydraulic pump 4 and a main check valve 7 which are sequentially connected in series on the corresponding parallel oil passage, and the main hydraulic pump 4 is drivingly connected with the main motor 1 of the automobile through the gear set 2;
  • the auxiliary hydraulic unit comprises a series connection in parallel in parallel
  • the auxiliary hydraulic pump 10 and the auxiliary check valve 9 on the oil passage, the auxiliary hydraulic pump 10 and the auxiliary steering motor 11 are directly connected;
  • a tee 8 is provided between the main check valve 7 and the auxiliary check valve 9, and the tee 8 has Two oil inlets and one oil outlet, the main check valve 7 and the auxiliary check valve 9 are respectively arranged at the two oil inlets of the three-way 8, the oil outlet of the three-way 8 and the power steering gear 5
  • An overflow valve 6 is connected in series with the oil passage between the oil inlets, and the oil outlet of the relief valve 6 is connected with the oil inlet of the power steering gear 5, and the overflow port is
  • the oil storage tank 3 is connected, and
  • the main hydraulic unit further includes a main controller 14 for measuring the rotational speed of the main motor 1 of the automobile, and the auxiliary hydraulic unit further includes an auxiliary controller 12 for controlling the operating condition of the auxiliary steering motor 11, the auxiliary control
  • the device 12 is connected to the main controller 14 via a CAN bus to implement information exchange.
  • the hydraulic oil passing through the main hydraulic pump 4 becomes high-pressure oil, and the high-pressure oil enters the power steering device 5 through the main check valve 7 and the tee 8, so that the power steering device 5 is operated, and the main check valve 7 It is used to prevent the passing of the high-pressure oil;
  • the auxiliary steering motor 11 when the auxiliary steering motor 11 is working, the hydraulic oil that has passed through the auxiliary hydraulic pump 10 becomes high-pressure oil, and the high-pressure oil enters the power steering device 5 through the auxiliary check valve 9 and the three-way 8 to assist the power.
  • the steering device 5 is operated, and the auxiliary check valve 9 is used to prevent the passing of the high-pressure oil.
  • the two high-pressure oils meet in the tee 8 and enter the power steering device 5 to assist the power.
  • the steering gear 5 works. Since the overflow valve 6 is connected in series with the oil passage between the oil outlet of the three-way 8 and the oil inlet of the power steering gear 5, the flow rate of the overflow valve 6 (ie, the flow rate of the power steering input 5) is basically It is constant, ensuring that the steering force of the output of the power steering gear 5 is maintained within a stable range.
  • the flow rate entering the power steering device 5 is ultimately determined by the flow rate output by the main hydraulic pump 4 and the flow rate output by the auxiliary hydraulic pump 10,
  • the flow rate entering the power steering gear 5 is P
  • the flow rate of the main hydraulic pump 4 is S1
  • the flow rate of the auxiliary hydraulic pump 10 is S2.
  • the value of S2 is determined by the rotation speed n2 of the auxiliary steering motor 11 and the displacement of the auxiliary hydraulic pump.
  • the flow rate of the overflow valve 6 before and after the flow should always satisfy S ⁇ P; meanwhile, the working state of the automobile main motor 1 determines the working state of the automobile (such as high speed, low speed, reverse, etc.), and its operating condition
  • the information exchange between the main controller 14 and the auxiliary controller 12, that is, the main controller 14 is used to collect the result of the rotational speed nl of the main motor 1 of the automobile.
  • the auxiliary controller 12 controls the operation of the auxiliary steering motor 11 according to the result of the feedback from the main controller 14, In order to ensure that the rotational speed of the auxiliary steering motor 11 varies with the change of the main motor 1, namely:
  • the main controller 14 feeds back information to the auxiliary controller 12, which calculates the need for the auxiliary steering motor 11.
  • the main controller 14 transmits information to the auxiliary controller 12, and the auxiliary controller 12 controls the auxiliary steering motor 11 to stop working. At this time, only the main hydraulic pump 4 supplies the flow to the power steering gear 5.
  • the specific working principle of the above embodiment is as follows: The system is applied to a new energy vehicle, and 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 is turned in place, reversed, and coasted back, the main The motor 1 does not rotate or reverse, and the auxiliary steering motor 11 operates. Only the auxiliary hydraulic pump 10 provides steering assist to the power steering gear 5; when the vehicle advances at a low speed, the main motor 1 forward rotation speed is lower than the rotation speed threshold, and the main hydraulic pump 4 provides The assisting power 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 forward rotation speed is higher than the rotation speed threshold, and the main hydraulic pump 4 provides The assistance assists the steering demand, and the auxiliary steering motor 11 stops working.
  • the main controller directly measures the actual flow rate of the main hydraulic pump, and feeds the measurement result to the auxiliary controller, and the auxiliary controller according to the feedback result.
  • the auxiliary steering motor maintains a constant speed operation, and the auxiliary controller controls the flow regulating valve according to the feedback result to control the flow output of the auxiliary hydraulic pump, and controls the auxiliary steering motor to stop when the flow regulating valve is completely closed.
  • control method of the hybrid-driven electrohydraulic power steering system of the present invention is the same as the control method in the above embodiment, and the content thereof will not be described herein.

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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

一种混合驱动的电动液压助力转向系统及其控制方法，该转向系统的储油罐和助力转向器之间并联设置有主液压单元和辅助液压单元，主液压单元的主单向阀和辅助液压单元的辅助单向阀之间设有三通，三通的两个进油口分别与主单向阀和辅助单向阀连接，三通的出油口与助力转向器的进油口之间的油路上串联有溢流阀；主液压单元还包括用于测量主液压泵输出的流量大小的主控制器，辅助液压单元还包括与主控制器连接的、用于控制辅助液压泵输出流量大小的辅助控制器。该转向系统及其控制方法根据主液压泵输出流量的情况，来实时调节辅助液压泵输出的流量，从而兼顾两个液压单元的助力，防止能量浪费。

Description

说明书 混合驱动的电动液压助力转向系统及其控制方法 技术领域
本发明涉及一种混合驱动的电动液压助力转向系统及其控制方法。
背景技术
电动液压助力转向系统， 简称 EHPS, 广泛应用于新能源汽车上， 尤其是纯 电动汽车和深度混合动力汽车。 传统的新能源客车采用的助力转向系统为单液 压驱动， 即助力转向器由一个液压泵提供助力， 而液压泵由汽车发动机驱动， 一旦发动机停止运转或反转时， 转向油泵和助力转向器也就随即停止工作， 方 向盘的转向变得沉重， 无法满足客车的停机转向或倒车转向需要。
中国专利 CN202193115U公开了一种混合动力汽车用双泵液压助力转向装 置， 该装置的储油罐和助力转向器之间具有两个并联的油路， 其中一个并联油 路上设有主液压单元， 另一个并联油路上设有辅助液压单元。 主液压单元包括 串联在对应油路上的主液压泵， 主液压泵由汽车发动机驱动； 辅助液压单元包 括串联在对应油路上的辅助液压泵， 辅助液压泵由辅助转向电机驱动。 主液压 泵和辅助液压泵之间设有梭阀， 梭阀的两个进油口分别与主液压泵和辅助液压 泵的出油口一一对应连接， 梭阀的出油口与助力转向器的进油口连接。 该装置 采用主液压单元和辅助液压单元同时为助力转向器提供驱动液压， 即使发动机 停止运转或反转， 还有辅助转向电机和辅助液压泵为助力转向器提供助力， 但 是由于两个液压单元对应的高压油路通过梭阀与助力转向器连接， 梭阀只能保 证油压较高一侧的油路导通， 也就是说当主液压泵输出的油压大于辅助液压泵 输出的油压时， 只有主液压泵为助力转向器提供助力， 但是辅助转向电机还在 继续运行， 辅助液压泵输出的流量白白浪费掉， 造成辅助液压泵输出的能量浪 费； 当主液压泵输出的油压小于辅助液压泵输出的油压时， 只有辅助液压泵为 助力转向器提供助力， 但是发动机还在继续运行， 主液压泵输出的流量白白浪 费掉， 造成发动机输出的能量浪费。
发明内容
本发明的目的是提供一种混合驱动的电动液压助力转向系统， 用以解决现 有转向系统不能兼顾为助力转向器提供不同助力的两个液压单元， 而造成能量 浪费的问题。 同时本发明还提供了该系统的控制方法。
本发明的混合驱动的电动液压助力转向系统的控制方法采用如下技术方案: 一种混合驱动的电动液压助力转向系统的控制方法， 该方法对应的助力转向系 统包括主液压单元和辅助液压单元， 其中， 主液压单元的主液压泵由汽车主电 机驱动， 辅助液压单元的辅助液压泵由辅助转向电机驱动； 主液压单元的主控 制器实时测量主液压泵输出的流量 S1 , 并将测量的结果实时反馈给辅助液压单 元的辅助控制器， 辅助控制器根据反馈的结果控制辅助液压泵输出流量 S2， S2 ^P-Sl , P为助力转向器工作所需的恒定流量。
所述主控制器通过测量汽车主电机的转速来测量主液压泵的流量， 所述辅 助控制器通过控制辅助转向电机的转速来控制辅助液压泵输出的流量。
本发明的混合驱动的电动液压助力转向系统采用如下技术方案： 一种实施 上述控制方法的混合驱动的电动液压助力转向系统， 包括储油罐和助力转向器， 储油罐和助力转向器之间并联设置有主液压单元和辅助液压单元， 主液压单元 包括依次串联在对应并联油路上的主液压泵和主单向阀， 主液压泵由汽车主电 机驱动， 辅助液压单元包括依次串联在对应并联油路上的辅助液压泵和辅助单 向阀， 辅助液压泵由辅助转向电机驱动； 所述主单向阀和辅助单向阀之间设有 三通， 三通的两个出油口分别与主单向阀和辅助单向阀一一对应连接， 三通的 出油口与助力转向器的进油口之间的油路上串联有溢流阀， 溢流阀的出油口与 助力转向器的进油口连接、 溢流口与储油罐连接； 主液压单元还包括用于测量 主液压泵输出的流量大小的主控制器， 辅助液压单元还包括与主控制器连接的、 用于控制主液压泵输出流量大小的辅助控制器。
所述主控制器通过测量汽车主电机的转速来测量主液压泵的流量大小， 所 述辅助液压泵由辅助转向电机驱动， 辅助控制器通过控制辅助转向电机来控制 辅助液压泵输出的流量。
采用上述结构的电动液压助力转向系统， 由于在主液压单元的主单向阀和 辅助液压单元的辅助单向阀之间设置了三通， 这样两个并联的高压油路在三通 位置处进行会合， 两个油路上的液压泵不仅能独立的为助力转向器提供助力， 还能够提供二者的合力； 而三通和助力转向器之间设置的溢流阀， 能够保证输 入到助力转向器的流量在一定范围内， 防止进入助力转向器的流量过大而对助 力转向器造成损害； 更重要的是， 主控制器实时测量主液压泵输出流量大小， 而辅助控制器根据主控制器反馈的结果控制辅助液压泵相应的输出流量， 根据 主液压泵输出流量的情况， 来实时调节辅助液压泵输出的流量， 这样可以很好 的兼顾两个液压单元的助力， 防止能量浪费。
附图说明
图 1为本发明的电动液压助力转向系统的结构示意图。
具体实施方式
本发明的电动液压助力转向系统的实施例： 如图 1所示， 包括储油罐 3和 助力转向器 5， 储油罐 3具有两个出油口和一个回油口， 助力转向器 5具有一个 进油口和一个出油出口， 助力转向器 5的出油口与储油罐 3的回油口连接； 储 油罐 3的两个出油口和助力转向器 5的进油口之间设有两个并联的油路， 其中 一个并联的油路上设有主液压单元， 另一个并联油路上设有辅助液压单元。 其 中， 主液压单元包括依次串联在对应并联油路上的主液压泵 4和主单向阀 7， 主 液压泵 4通过齿轮组 2与汽车主电机 1传动连接； 辅助液压单元包括依次串联 在对应并联油路上的辅助液压泵 10和辅助单向阀 9，辅助液压泵 10与辅助转向 电机 11直接传动连接； 在主单向阀 7和辅助单向阀 9之间设有三通 8， 三通 8 具有两个进油口和一个出油口， 主单向阀 7和辅助单向阀 9分别对应设置在三 通 8的两个进油口处， 在三通 8的出油口和助力转向器 5的进油口之间的油路 上串联有溢流阀 6， 溢流阀 6的出油口与助力转向器 5的进油口连接、溢流口与 储油罐 3连接， 溢流阀 6能够保证由三通 8进入到助力转向器 5的高压油的流 量维持在一定范围内， 防止进入助力转向器 5 的流量过大而对助力转向器造成 损害。 本实施例中， 主液压单元还包括一个用于测量汽车主电机 1 转速大小的 主控制器 14，辅助液压单元还包括一个用于控制辅助转向电机 11运转工况的辅 助控制器 12，辅助控制器 12通过 CAN总线与主控制器 14连接以实现信息交换。
当主电机 1工作时， 经过主液压泵 4的液压油变为高压油， 高压油经主单 向阀 7和三通 8进入到助力转向器 5， 使助力转向器 5工作， 主单向阀 7用以防 止经过的高压油逆流； 当辅助转向电机 11工作时， 经过辅助液压泵 10的液压 油变成高压油， 高压油经辅助单向阀 9、 三通 8进入助力转向器 5， 使助力转向 器 5工作， 辅助单向阀 9用以防止经过的高压油逆流； 当主电机 1、 辅助电机 11 同时工作时， 两路高压油在三通 8内会合后进入到助力转向器 5， 使助力转 向器 5工作。 由于三通 8的出油口和助力转向器 5的进油口之间的油路上串联 了溢流阀 6， 溢流阀 6输出的流量大小（即助力转向器 5输入的流量大小）基本 上是恒定的， 保证了助力转向器 5输出的转向力维持在了一个稳定的范围内。
上述实施例的具体控制方法为： 从上述内容中可知， 进入到助力转向器 5 内的流量大小最终是由主液压泵 4输出的流量大小和辅助液压泵 10输出的流量 大小共同决定的， 设定进入到助力转向器 5内的流量大小为 P, 主液压泵 4输出 的流量大小为 S1 , 辅助液压泵 10输出的流量大小为 S2。 其中， S1的值由主电 机 1的转速 nl和主液压泵的排量 cl决定， 即 Sl=nl X cl， 同样的， S2的值由 辅助转向电机 11的转速 n2和辅助液压泵的排量 c2决定， 即 S2=n2 X c2， 这样 由三通 8输出的流量大小（即溢流阀 6输入的流量大小） S=S1+S2。本实施例中， 溢流阀 6前后进出的流量应始终满足 S^P; 同时， 由于汽车主电机 1的工作状 态决定了汽车的工作状态 （如高速、 低速、 倒车等）， 其运转工况要不时的发生 变化， 为了满足 S^P的条件以及最小的能量消耗， 通过主控制器 14和辅助控 制器 12的信息交换，即主控制器 14用以采集汽车主电机 1转速大小 nl的结果， 辅助控制器 12根据主控制器 14反馈的结果相应的控制辅助转向电机 11的运转， 以保证辅助转向电机 11的转速随主电机 1的变化而变化， 即：
当主电机 1停止运转或反转时，其转速 nl=0，主液压泵 4输出的流量 S1=0， 主控制器 14将采集到的信息反馈给辅助控制器 12， 辅助控制器 12根据反馈的 结果进行计算，计算出辅助转向电机 11的转速 n2，以满足 nl X cl+ n2 X c2 P， 辅助控制器 12控制辅助转向电机 11全速运转， 此时， 只有辅助液压泵 10为助 力转向器 5提供流量。
当主电机 1低速运转时， 主液压泵 4输出的流量不足以满足助力转向器 5 所需的流量， 主控制器 14将信息反馈给辅助控制器 12， 辅助控制器 12计算出 辅助转向电机 11需要的最小转速，从而控制辅助转向电机 11以合适转速运转， 此时， 主液压泵 1和辅助液压泵 10共同为助力转向器 5提供流量。
当主电机 1高速运转时， 主液压泵 4输出的流量足以满足助力转向器 5所 需的流量， 主控制器 14将信息发送给辅助控制器 12， 辅助控制器 12会控制辅 助转向电机 11停止工作， 此时只有主液压泵 4为助力转向器 5提供流量。
上述实施例具体工作原理如下： 该系统应用在新能源汽车上， 主液压泵 4、 辅助液压泵 10的工作状态与汽车的工作状态有关， 即当车辆原地转向、 倒车及 滑行回馈时， 主电机 1不转或反转， 辅助转向电机 11工作， 只有辅助液压泵 10 为助力转向器 5提供转向助力； 当车辆低速前进时， 主电机 1正转转速小于转 速阀值， 主液压泵 4提供的助力无法满足转向需求， 此时， 辅助转向电机 11也 工作， 助力转向器 5得到二者的合力； 当车辆高速前进时， 主电机 1正转转速 高于转速阀值， 主液压泵 4提供的助力满足转向需求， 辅助转向电机 11停止工 作。
在其他实施例中， 通过在主液压泵的高压油路上分别设置流量表， 主控制 器直接测量主液压泵实际输出的流量大小， 并将测量结果反馈给辅助控制器， 辅助控制器根据反馈结果控制辅助转向电机的运转； 或者在主液压泵的高压油 路上设置流量表的同时， 在辅助液压泵的高压油路上设置流量调节阀， 主控制 器直接测量主液压泵实际输出的流量大小， 并将测量结果反馈给辅助控制器， 与此同时辅助转向电机保持定速运转， 辅助控制器根据反馈结果控制流量调节 阀来控制辅助液压泵的流量输出， 并在流量调节阀完全关闭时， 控制辅助转向 电机停止工作。
本发明的混合驱动的电动液压助力转向系统的控制方法的实施例： 与上述 实施例中的控制方法一致， 其内容在此不再赘述。

Claims

权利要求书
1. 一种混合驱动的电动液压助力转向系统的控制方法， 其特征在于： 该方法对 应的助力转向系统包括主液压单元和辅助液压单元， 其中， 主液压单元的主液 压泵由汽车主电机驱动， 辅助液压单元的辅助液压泵由辅助转向电机驱动； 主 液压单元的主控制器实时测量主液压泵输出的流量 S1 , 并将测量的结果实时反 馈给辅助液压单元的辅助控制器， 辅助控制器根据反馈的结果控制辅助液压泵 输出流量 S2， S2 ^P-S1 , P为助力转向器工作所需的恒定流量。
2. 根据权利要求 1所述的混合驱动的电动液压助力转向系统的控制方法， 其特 征在于： 所述主控制器通过测量汽车主电机的转速来测量主液压泵的流量， 所 述辅助控制器通过控制辅助转向电机的转速来控制辅助液压泵输出的流量。
3. 一种实施如权利要求 1 所述控制方法的混合驱动的电动液压助力转向系统， 其特征在于： 包括储油罐和助力转向器， 储油罐和助力转向器之间并联设置有 主液压单元和辅助液压单元， 主液压单元包括依次串联在对应并联油路上的主 液压泵和主单向阀， 主液压泵由汽车主电机驱动， 辅助液压单元包括依次串联 在对应并联油路上的辅助液压泵和辅助单向阀， 辅助液压泵由辅助转向电机驱 动； 所述主单向阀和辅助单向阀之间设有三通， 三通的两个出油口分别与主单 向阀和辅助单向阀一一对应连接， 三通的出油口与助力转向器的进油口之间的 油路上串联有溢流阀， 溢流阀的出油口与助力转向器的进油口连接、 溢流口与 储油罐连接； 主液压单元还包括用于测量主液压泵输出的流量大小的主控制器， 辅助液压单元还包括与主控制器连接的、 用于控制主液压泵输出流量大小的辅 助控制器。
4. 根据权利要求 3所述的混合驱动的电动液压助力转向系统， 其特征在于： 所 述主控制器通过测量汽车主电机的转速来测量主液压泵的流量大小， 所述辅助 液压泵由辅助转向电机驱动， 辅助控制器通过控制辅助转向电机来控制辅助液 压泵输出的流量。
PCT/CN2014/072222 2013-04-08 2014-02-19 混合驱动的电动液压助力转向系统及其控制方法 WO2014166314A1 (zh)

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