CN117485425A - Hydraulic steering system, control method thereof and dump truck - Google Patents

Hydraulic steering system, control method thereof and dump truck Download PDF

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Publication number
CN117485425A
CN117485425A CN202311763128.9A CN202311763128A CN117485425A CN 117485425 A CN117485425 A CN 117485425A CN 202311763128 A CN202311763128 A CN 202311763128A CN 117485425 A CN117485425 A CN 117485425A
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CN
China
Prior art keywords
steering
oil
pressure
hydraulic
oil inlet
Prior art date
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Pending
Application number
CN202311763128.9A
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Chinese (zh)
Inventor
李文举
熊世文
康海洋
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Great Wall Heavy Industry Co ltd
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Great Wall Heavy Industry Co ltd
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Application filed by Great Wall Heavy Industry Co ltd filed Critical Great Wall Heavy Industry Co ltd
Priority to CN202311763128.9A priority Critical patent/CN117485425A/en
Publication of CN117485425A publication Critical patent/CN117485425A/en
Pending legal-status Critical Current

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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
    • 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
    • B62D5/07—Supply of pressurised fluid for steering also supplying other consumers ; control thereof
    • B62D5/075—Supply of pressurised fluid for steering also supplying other consumers ; control thereof using priority valves
    • 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
    • B62D5/08—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 type of steering valve used

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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

The invention provides a hydraulic steering system, a control method thereof and a dump truck, wherein the hydraulic steering system comprises a hydraulic oil tank, a steering gear, a steering oil cylinder, a main reversing loop and an emergency reversing loop; the main reversing loop comprises a first oil inlet pipeline arranged between an oil inlet of the steering gear and the hydraulic oil tank and a first oil return pipeline arranged between an oil outlet of the steering gear and the hydraulic oil tank, and a main steering pump is arranged on the first oil inlet pipeline; the emergency reversing loop comprises a second oil inlet pipeline connected with the first oil inlet pipeline in parallel and a first return pipeline, an emergency steering pump, a liquid filling valve and an energy accumulator are sequentially arranged on the second oil inlet pipeline, the emergency steering pump can charge the energy accumulator through the liquid filling valve, and the energy accumulator can supply oil to an oil inlet of the steering gear through the second oil inlet pipeline; the steering gear is connected with the steering oil cylinder and is used for providing hydraulic oil for the steering oil cylinder so as to drive the steering oil cylinder to act. The hydraulic steering system can improve the rapidity of emergency steering response.

Description

Hydraulic steering system, control method thereof and dump truck
Technical Field
The invention relates to the technical field of steering systems, in particular to a hydraulic steering system. The invention also relates to a control method of the hydraulic steering system. Meanwhile, the invention also relates to a dump truck with the hydraulic steering system.
Background
The existing hydraulic steering system is one of a high-pressure main steering motor pump matched with a high-pressure accumulator and the other of the hydraulic steering system is a low-pressure emergency steering pump matched with a high-pressure motor pump. The two have the following disadvantages respectively: the high-pressure main steering motor pump is matched with the high-pressure accumulator, so that the high-pressure main steering motor pump fails due to various reasons, and the high-pressure accumulator releases stored hydraulic energy to a certain pressure and loses effect. However, if a certain duration is desired, a larger-sized accumulator needs to be installed, and the space and cost of the whole machine are limited.
The high-voltage motor pump is matched with the low-voltage emergency steering pump, the high-voltage main steering motor pump fails, the low-voltage emergency steering pump is started to provide hydraulic energy for the steering system, the low-voltage emergency steering pump energy is measured to the low-voltage storage battery, the storage battery is less in configuration quantity due to factors such as the whole machine space and the cost of the storage battery, the storage electric quantity is limited, the duration is short, the steering is slow, and the battery is damaged or damaged due to continuous power supply.
Disclosure of Invention
In view of this, the present invention aims to propose a hydraulic steering system that is able to improve the rapidity of the emergency steering response.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
a hydraulic steering system comprises a hydraulic oil tank, a steering gear, a steering oil cylinder, a main reversing loop and an emergency reversing loop;
the main reversing loop comprises a first oil inlet pipeline arranged between an oil inlet of the steering gear and the hydraulic oil tank and a first oil return pipeline arranged between an oil outlet of the steering gear and the hydraulic oil tank, and a main steering pump is arranged on the first oil inlet pipeline;
the emergency reversing loop comprises a second oil inlet pipeline connected with the first oil inlet pipeline in parallel and the first return pipeline, an emergency steering pump, a charging valve and an energy accumulator are sequentially arranged on the second oil inlet pipeline, the emergency steering pump can charge the energy accumulator through the charging valve for energy storage, and the energy accumulator can supply oil to an oil inlet of the steering gear through the second oil inlet pipeline;
the steering gear is connected with the steering oil cylinder and is used for providing hydraulic oil for the steering oil cylinder so as to drive the steering oil cylinder to act.
Further, a priority valve and a one-way valve are arranged on the first oil inlet pipeline, the priority valve is located between the main steering pump and the one-way valve, and the priority valve is used for achieving unloading energy conservation of the main steering pump when the steering gear does not work.
Further, a pressure relief oil way is connected in parallel on the first oil inlet pipeline, one end of the pressure relief oil way is connected with the outlet end of the one-way valve, the other end of the pressure relief oil way is connected with the hydraulic oil tank, and an overflow device is arranged on the pressure relief oil way.
Further, a first pressure detection device is arranged on the first oil inlet pipeline and/or the second oil inlet pipeline, the first pressure detection device is arranged close to the steering gear, and the first pressure detection device is used for detecting the pressure of oil entering an oil inlet of the steering gear.
Further, a control valve is arranged on the second oil inlet pipeline and is positioned at the downstream of the energy accumulator, and the control valve is used for switching on or switching off the second oil inlet pipeline.
Further, a second pressure detection device is arranged on the second oil inlet pipeline and is positioned between the control valve and the energy accumulator, and the second pressure detection device is used for detecting the oil pressure at the oil port of the energy accumulator.
Compared with the prior art, the invention has the following advantages:
according to the hydraulic steering system, through the main reversing loop and the emergency reversing loop which are arranged, and the charging valve and the energy accumulator are arranged in the emergency reversing loop, the emergency steering pump charges the energy accumulator through the charging valve, and when the main reversing loop cannot work normally, the energy accumulator can independently supply oil to the steering gear to drive the steering oil cylinder to act, and the energy accumulator and the emergency steering pump can also supply oil to the steering gear at the same time, so that the rapidity of emergency steering response can be improved.
In addition, the priority valve arranged on the first oil inlet pipeline can realize unloading energy conservation of the main steering pump when the steering gear does not work, and the arranged one-way valve can prevent oil from flowing to the priority valve and the main steering pump to release pressure when the emergency steering pump operates. The pressure relief oil way and the overflow device are arranged, play roles of protecting the system and determining the system pressure, and when the load pressure exceeds the overflow pressure set by the overflow device, the unloading of the oil way system is realized through the overflow pressure, so as to protect transmission components.
In addition, the first pressure detection device is used for detecting the pressure of oil entering an oil inlet of the steering gear, namely detecting the pressure of a steering pipeline. The arrangement of the control valve on the second oil way can be beneficial to realizing the on-off of the second oil way, and when the pressure of the main reversing loop is insufficient, the second oil way is conducted through the control valve, so that the emergency reversing pump provides power for the steering gear. And the second pressure detection device is arranged on the second oil way and is used for detecting the pressure of the energy accumulator.
Another object of the present invention is to propose a control method of a hydraulic steering system as described above, the control method comprising:
the preset pressure of the first pressure detection device is A1, the preset pressure of the second pressure detection device is A2, the set cut-off pressure of the liquid filling valve is A3, and when the hydraulic steering system works normally, the following conditions are met: a1 is more than A2 and less than A3;
in driving, when the detected pressure A1 detected by the first pressure detection device is smaller than A1, the main steering pump works, the control valve is controlled to change direction, the energy accumulator is controlled to work, the emergency steering pump is controlled to work at the same time, and the energy accumulator and the emergency steering pump simultaneously provide hydraulic oil for the oil inlet of the steering gear;
and when the detection pressure A1 is still smaller than A1 after the emergency steering pump circulates for a plurality of times, sending out a fault signal in the emergency steering loop.
Further, the control method further includes: in the driving process, the detection pressure A1 is smaller than A1, the main steering pump does not work, and a fault signal in the main steering loop is sent out.
Further, in the driving process, when the detection pressure A2 detected by the second pressure detection device is smaller than A2, the emergency steering pump is controlled to work, the accumulator is filled with liquid through the liquid filling valve until the set cut-off pressure A3 is reached, the emergency steering pump is unloaded, the detection pressure A2 is larger than A2, and the emergency steering pump stops working.
The control method of the hydraulic steering system can be beneficial to realizing intelligent control of normal steering and emergency steering, and is also beneficial to intelligent identification of faults of the hydraulic steering system.
A further object of the present invention is to provide a dump truck provided with the hydraulic steering system as described above.
Compared with the prior art, the dumper has the same beneficial effects as the hydraulic steering system, and the dumper is not repeated here.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 is a schematic diagram of a hydraulic steering system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a steering gear and steering cylinder connection according to an embodiment of the present invention;
FIG. 3 is a logic diagram of a method of controlling a hydraulic steering system according to an embodiment of the present invention;
reference numerals illustrate:
1. a hydraulic oil tank; 2. a main steering pump; 3. an emergency steering pump; 4. a priority valve; 5. a charging valve; 6. an accumulator; 7. a second pressure detecting means; 8. a control valve; 9. a one-way valve; 11. a first pressure detection device; 12. a controller; 13. a diverter; 14. a steering cylinder; 15. an overflow device;
10. a first oil inlet line; 20. a second oil inlet pipeline; 30. a first oil return line; 40. decompression oil way; 50. the second oil return pipeline; 60. a third oil return line; 70. and a feedback oil path.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
In the description of the present invention, it should be noted that, if terms indicating an orientation or positional relationship such as "upper", "lower", "inner", "outer", etc. are presented, they are based on the orientation or positional relationship shown in the drawings, only for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, if any, are also used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Furthermore, in the description of the present invention, the terms "mounted," "connected," and "connected," are to be construed broadly, unless otherwise specifically defined. For example, the connection can be fixed connection, detachable connection or integrated connection; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in combination with specific cases.
The invention will be described in detail below with reference to the drawings in connection with embodiments.
The present embodiment relates to a hydraulic steering system capable of improving the rapidity of an emergency steering response.
In terms of overall construction, as shown in fig. 1, the hydraulic steering system of the present embodiment specifically includes a hydraulic tank 1, a steering gear 13, a steering cylinder 14, and a main steering circuit and an emergency steering circuit.
The main reversing loop comprises a first oil inlet pipeline 10 arranged between an oil inlet of the steering gear 13 and the hydraulic oil tank 1, and a first oil return pipeline 30 arranged between an oil outlet of the steering gear 13 and the hydraulic oil tank 1, wherein the main steering pump 2 is arranged on the first oil inlet pipeline 10. The main steering pump 2 supplies the oil in the hydraulic tank 1 to the inlet of the steering gear.
The emergency reversing loop comprises a second oil inlet pipeline 20 connected with the first oil inlet pipeline 10 in parallel and a first return pipeline, an emergency steering pump 3, a charging valve 5 and an energy accumulator 6 are sequentially arranged on the second oil inlet pipeline 20, the emergency steering pump 3 can charge the energy accumulator 6 through the charging valve 5 to store energy, and the energy accumulator 6 can supply oil to an oil inlet of the steering gear 13 through the second oil inlet pipeline 20. Moreover, the emergency steering pump 3 also supplies the oil in the hydraulic tank 1 to the oil inlet of the steering gear.
And, the steering gear 13 is connected with the steering cylinder 14, and the steering gear 13 is used for providing hydraulic oil for the steering cylinder 14 to drive the steering cylinder 14 to act.
At this time, through the main reversing loop and the emergency reversing loop which are arranged, the main reversing loop and the emergency reversing loop share the same first oil return pipeline 30, so that the structure is simple and more compact, and the charging valve 5 and the energy accumulator 6 are arranged in the emergency reversing loop, so that the emergency steering pump 3 charges the energy accumulator 6 through the charging valve 5 to store energy, the energy accumulator 6 can independently supply oil to the steering gear 13 when the main reversing loop cannot work normally, the steering oil cylinder 14 is driven to act, and the energy accumulator 6 and the emergency steering pump 3 can simultaneously supply oil to the steering gear, so that the rapidity of emergency steering response can be improved.
In detail, as shown in fig. 1, the first oil inlet pipeline 10 is provided with a priority valve 4 and a one-way valve 9, the priority valve 4 is located between the main steering pump 2 and the one-way valve 9, and the priority valve 4 is used for realizing unloading energy conservation of the main steering pump 2 when the steering gear 13 is not operated. The check valve 9 prevents the oil from flowing to the priority valve 4 and the main steering pump 2 to release pressure when the emergency steering pump 3 is operated.
In specific implementation, the P port of the priority valve 4 is connected to the outlet of the main steering pump 2, the CF port of the priority valve 4 is connected to the inlet of the check valve 9, the FF port of the priority valve 4 is connected to the hydraulic oil tank 1 through a second oil return pipeline, and the oil port LD of the priority valve 4 is connected to the oil port LS of the steering device 13 through a feedback oil path 70. In this way, the priority valve 4 is provided to supply the oil to the steering gear 13 preferentially when the steering gear 13 is operated, and the unloading energy saving of the main steering pump 2 is realized by the feedback of the feedback oil passage 70 when the steering gear 13 is not operated. A one-way valve is provided downstream of the pilot valve 4, which prevents oil from flowing to the priority valve 4 and the main steering pump 2 for pressure relief when the emergency steering pump is running.
In this embodiment, the first oil inlet pipe 10 is connected with a pressure relief oil path 40 in parallel, one end of the pressure relief oil path 40 is connected with the outlet end of the check valve 9, the other end is connected with the hydraulic oil tank 1, and the pressure relief oil path 40 is provided with an overflow device 15. The pressure relief oil way 40 and the overflow device 15 are arranged, so that the system safety can be protected, the system pressure can be determined, when the load pressure exceeds the overflow pressure set by the overflow device 15, the unloading of the oil way system is realized through the overflow pressure, and the transmission components are protected. Furthermore, in practice, the overflow means preferably employs an overflow valve.
Still referring to fig. 1, in the present embodiment, a first pressure detecting device 11 is disposed on the first oil inlet pipe 10 and the second oil inlet pipe 20, the first pressure detecting device 11 is disposed near the diverter 13, and the first pressure detecting device 11 is used for detecting the pressure of the oil entering the oil inlet of the diverter 13. The first pressure detection device 11 is preferably a first pressure sensor.
In this embodiment, one end of the first oil inlet pipe 10 and one end of the second oil inlet pipe 20 are connected to the hydraulic oil tank 1, and the other end thereof are collected to the same connecting pipe, and are connected to the oil inlet of the steering gear 13 via the connecting pipe, and at this time, the first pressure detecting device 11 is disposed on the connecting pipe. In this way, the number of first pressure detecting means 11 can be reduced compared to a connection to the steering wheel oil inlet alone.
It should be noted that, instead of being disposed on the connecting pipeline, the first pressure detecting device 11 may be disposed only on the first oil inlet pipeline 10 or only on the second oil inlet pipeline 20, where the first pressure detecting device 11 may be disposed only to detect the pressure of the oil entering the oil inlet of the steering gear 13 in the main steering circuit or only to detect the pressure of the oil entering the oil inlet of the steering gear 13 in the primary steering circuit.
In this embodiment, the second oil inlet pipe 20 is provided with a control valve 8, the control valve 8 is located downstream of the accumulator 6, and the control valve 8 is used to switch on or off the second oil inlet pipe 20. Specifically, the control valve 8 is preferably a normally closed electromagnetic directional valve, and preferably, the control valve 8 is connected to the controller 12, the direction of the steering is controlled by the controller 12, when the steering is performed, the second oil inlet pipeline 20 is conducted, at this time, the accumulator 6 can supply oil to the oil inlet of the steering gear 13, and when the emergency steering pump 3 is controlled to start, the emergency steering pump 3 can also supply oil to the oil inlet of the steering gear 13.
In addition, in the present embodiment, a second pressure detecting device 7 is disposed on the second oil inlet pipe 20, the second pressure detecting device 7 is located between the control valve 8 and the accumulator 6, and the second pressure detecting device 7 is used for detecting the oil pressure at the oil port of the accumulator 6. When the pressure detected by the second pressure detection device 7 is lower than the set pressure of the accumulator 6, the emergency steering pump 3 is controlled to start, and the accumulator 6 is charged with liquid through the charging valve 5. When the pressure detected by the second pressure detecting means 7 reaches the set pressure of the accumulator 6, the emergency steering pump 3 is controlled to stop operating.
In this embodiment, by setting the second detection device 7 and the controller 12, and using the functions of low-pressure automatic filling and high-pressure automatic unloading of the filling valve 5, automatic filling of the accumulator 6 can be realized, and when the filling set pressure of the accumulator 6 is reached, automatic switching can be realized to realize unloading and power failure of the emergency motor pump 3.
In addition, as shown in fig. 1 and 2, the steering device 13 in this embodiment has a steering control valve, where the steering control valve adopts a three-position seven-way steering valve, and a P port of the steering control valve, that is, an oil inlet of the steering device 13, is connected to both the first oil inlet pipeline 10 and the second oil inlet pipeline 20, a T port of the steering control valve is connected to the first oil return pipeline 30, and an oil port LS port of the steering control valve is connected to an oil port of the priority valve 4 through the feedback oil path 70.
The specific operation of the hydraulic steering system of the present embodiment will be described in detail with reference to fig. 1 and 3.
Wherein, the preset pressure of the first pressure detecting device 11 is A1, the preset pressure of the second pressure detecting device 7 is A2, the set cut-off pressure of the filling valve 5 is A3, and when the hydraulic steering system works normally, the following conditions are satisfied: a1 < A2 < A3.
When the main steering circuit works, oil is sucked from the hydraulic oil tank 1 through the main steering pump 2, the oil reaches the steering gear 13 through the priority valve 4, the one-way valve 9 and the first pressure detection device 11, the steering gear 13 rotates to provide hydraulic oil for the steering oil cylinder 14, left and right steering is realized, and the oil flows back to the hydraulic oil tank 1 through the first oil return pipeline 30. When the load pressure exceeds the set pressure of the overflow device 15, the overflow valve is opened, so that oil unloading is realized, and components of the transmission structure are protected.
When the pressure in the main steering circuit is lower than the preset pressure of the first pressure detecting device 11, that is, when the detected pressure A1 of the first pressure detecting device 11 is lower than the preset pressure A1, the main steering pump 2 is not rotated, and at this time, the controller 12 issues a fault signal, for example, to check whether there is a fault in the motor, wire harness, program, or the like of the main steering pump 2.
When the detected pressure A1 of the first pressure detecting device 11 is smaller than the preset pressure A1, the main steering pump 2 rotates, at this time, the controller 12 controls the control valve 8 to switch over, the accumulator 6 supplies hydraulic oil to the oil inlet of the steering gear 13, and at the same time, the controller 12 controls the emergency steering pump 3 to operate, the emergency steering pump 3 operates at the highest rotation speed, and hydraulic oil is supplied to the oil inlet of the steering gear 13. When the detected pressure A1 detected by the first pressure detecting device 11 is greater than the preset pressure A1, the accumulator 6 and the emergency steering pump 3 supply hydraulic oil together to the oil inlet of the steering gear 13. When the detected pressure A1 of the first pressure detecting device 11 is still smaller than the preset pressure A1 after the emergency steering pump 3 circulates several times, the controller 12 sends out a fault signal in the emergency steering circuit, for example, whether the charging valve 5, the control valve 8, the accumulator 6 or the corresponding pipeline and the like have faults or not.
When the detected pressure A1 detected by the first pressure detecting means 11 is greater than the preset pressure A1, the steering gear 13 cannot steer, and at this time, the controller 12 signals that there is a failure in the main steering circuit, for example, checks whether there is a failure in the steering gear 13, the priority valve 4, the check valve 9, or the corresponding piping, or the like.
When the second pressure detection device 7 detects that the detection pressure A2 of the oil port of the accumulator 6 is smaller than A2, the controller 12 controls the emergency steering pump 3 to work, the accumulator 6 is charged with liquid through the liquid charging valve 5 until the liquid charging valve 5 is reached to set cutting-off pressure A3, the liquid charging valve 5 is unloaded through internal pilot control, the emergency steering pump 3 is detected to be larger than A2, the controller 12 controls the emergency steering pump 3 to stop rotating, so that the accumulator 6 always keeps hydraulic oil with certain pressure and flow, the control valve 8 is not electrified in the whole liquid charging process, and the second oil inlet pipeline 20 is in a disconnected state.
Example two
The present embodiment relates to a control method of the hydraulic steering system according to the first embodiment, and in combination with fig. 3, the control method includes: the preset pressure of the first pressure detection device 11 is A1, the preset pressure of the second pressure detection device 7 is A2, the set cut-off pressure of the filling valve 5 is A3, and when the hydraulic steering system works normally, the following conditions are satisfied: a1 < A2 < A3.
In driving, when the detected pressure A1 detected by the first pressure detecting device 11 is smaller than A1, the main steering pump 2 works, the control valve 8 is controlled to reverse, the energy accumulator 6 is controlled to work, the emergency steering pump 3 is controlled to work, and the energy accumulator 6 and the emergency steering pump 3 simultaneously provide hydraulic oil for the oil inlet of the steering gear 13. When the detected pressure A1 is still smaller than A1 after the emergency steering pump 3 circulates for a plurality of times, a fault signal in the emergency reversing loop is sent out.
In addition, in the traveling mode, the detected pressure A1 detected by the first pressure detecting device 11 is smaller than A1, and the main steering pump 2 does not operate, and a signal that a fault exists in the main steering circuit is sent.
In addition, when the detected pressure A2 detected by the second pressure detecting device 7 is smaller than A2 in the driving, the emergency steering pump 3 is controlled to work, the accumulator 6 is charged with liquid through the charging valve 5 until the set cut-off pressure A3 is reached, the emergency steering pump 3 is unloaded, the detected pressure A2 is larger than A2, and the emergency steering pump 3 stops working.
Reference is made in detail to the description above regarding specific operation of the hydraulic steering system.
The control method of the hydraulic steering system can be beneficial to realizing intelligent control of normal steering and emergency steering, is beneficial to intelligent identification of faults of the hydraulic steering system, and has good use effect.
The present embodiment also relates to a dump truck provided with the hydraulic steering system according to the first embodiment. And preferably, the dumper is a pure electric off-highway wide dumper.
The dumper of the embodiment can be beneficial to realizing automatic energy supplementing and cutting-off control of the energy accumulator 6 by applying the hydraulic steering system of the embodiment I, and the energy accumulator 6 and the emergency steering pump 3 supply oil to the steering gear 13 at the same time, so that the dumper can be beneficial to intelligent control of normal steering and emergency steering, and has the advantages of quick response, long endurance time, safety and energy conservation, and good use effect.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.

Claims (10)

1. A hydraulic steering system, characterized by:
the steering device comprises a hydraulic oil tank (1), a steering gear (13), a steering oil cylinder (14), a main reversing loop and an emergency reversing loop;
the main reversing loop comprises a first oil inlet pipeline (10) arranged between an oil inlet of the steering gear (13) and the hydraulic oil tank (1), and a first oil return pipeline (30) arranged between an oil outlet of the steering gear (13) and the hydraulic oil tank (1), wherein a main steering pump (2) is arranged on the first oil inlet pipeline (10);
the emergency reversing loop comprises a second oil inlet pipeline (20) connected with the first oil inlet pipeline (10) in parallel and the first return pipeline, an emergency steering pump (3), a charging valve (5) and an energy accumulator (6) are sequentially arranged on the second oil inlet pipeline (20), the emergency steering pump (3) can charge the energy accumulator (6) through the charging valve (5), and the energy accumulator (6) can supply oil to an oil inlet of the steering gear (13) through the second oil inlet pipeline (20);
the steering device (13) is connected with the steering oil cylinder (14), and the steering device (13) is used for providing hydraulic oil for the steering oil cylinder (14) so as to drive the steering oil cylinder (14) to act.
2. The hydraulic steering system of claim 1, wherein:
the first oil inlet pipeline (10) is provided with a priority valve (4) and a one-way valve (9), the priority valve (4) is positioned between the main steering pump (2) and the one-way valve (9), and the priority valve (4) is used for realizing unloading energy conservation of the main steering pump (2) when the steering gear (13) does not work.
3. The hydraulic steering system of claim 2, wherein:
the hydraulic oil tank is characterized in that a pressure relief oil way (40) is connected in parallel to the first oil inlet pipeline (10), one end of the pressure relief oil way (40) is connected with the outlet end of the one-way valve (9), the other end of the pressure relief oil way is connected with the hydraulic oil tank (1), and an overflow device (15) is arranged on the pressure relief oil way (40).
4. A hydraulic steering system according to claim 3, wherein:
the novel oil inlet device is characterized in that a first pressure detection device (11) is arranged on the first oil inlet pipeline (10) and/or the second oil inlet pipeline (20), the first pressure detection device (11) is close to the steering gear (13), and the first pressure detection device (11) is used for detecting oil pressure entering an oil inlet of the steering gear (13).
5. The hydraulic steering system of claim 4, wherein:
the second oil inlet pipeline (20) is provided with a control valve (8), the control valve (8) is positioned at the downstream of the energy accumulator (6), and the control valve (8) is used for switching on or switching off the second oil inlet pipeline (20).
6. The hydraulic steering system of claim 5, wherein:
the second oil inlet pipeline (20) is provided with a second pressure detection device (7), the second pressure detection device (7) is located between the control valve (8) and the energy accumulator (6), and the second pressure detection device (7) is used for detecting oil pressure at an oil port of the energy accumulator (6).
7. The control method of a hydraulic steering system according to claim 6, characterized in that the control method includes:
the preset pressure of the first pressure detection device (11) is A1, the preset pressure of the second pressure detection device (7) is A2, the set cut-off pressure of the liquid filling valve (5) is A3, and when the hydraulic steering system works normally, the following conditions are met: a1 is more than A2 and less than A3;
in driving, when the detected pressure A1 detected by the first pressure detection device (11) is smaller than A1, the main steering pump (2) works, the control valve (8) is controlled to reverse, the energy accumulator (6) is controlled to work, the emergency steering pump (3) is controlled to work at the same time, and the energy accumulator (6) and the emergency steering pump (3) simultaneously provide hydraulic oil for an oil inlet of the steering gear (13);
and when the detection pressure A1 is still smaller than A1 after the emergency steering pump (3) circulates for a plurality of times, sending out a fault signal in the emergency steering loop.
8. The control method of a hydraulic steering system according to claim 7, characterized in that the control method further comprises:
in the driving process, the detection pressure A1 is smaller than A1, the main steering pump (2) does not work, and a fault signal in the main steering loop is sent.
9. The control method of a hydraulic steering system according to claim 7, characterized in that the control method further comprises:
in driving, when the detection pressure A2 detected by the second pressure detection device (7) is smaller than A2, the emergency steering pump (3) is controlled to work, the accumulator (6) is charged through the charging valve (5) until the set cutting-off pressure A3 is reached, the emergency steering pump (3) is unloaded, the detection pressure A2 is larger than A2, and the emergency steering pump (3) stops working.
10. A dump truck, characterized in that:
the hydraulic steering system according to any one of claims 1 to 6 is provided in the dump truck.
CN202311763128.9A 2023-12-19 2023-12-19 Hydraulic steering system, control method thereof and dump truck Pending CN117485425A (en)

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