CN110805581A - Novel hydraulic traveling reverse drive control system - Google Patents
Novel hydraulic traveling reverse drive control system Download PDFInfo
- Publication number
- CN110805581A CN110805581A CN201911110235.5A CN201911110235A CN110805581A CN 110805581 A CN110805581 A CN 110805581A CN 201911110235 A CN201911110235 A CN 201911110235A CN 110805581 A CN110805581 A CN 110805581A
- Authority
- CN
- China
- Prior art keywords
- hydraulic
- reverse
- hydraulic motor
- oil
- electric proportional
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
- F15B20/007—Overload
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Control Of Fluid Gearings (AREA)
Abstract
The invention discloses a novel hydraulic traveling back-drive control system, which relates to the technical field of back-drive control and comprises the following components: one end of the reverse drive control device is connected with a first oil outlet and a second oil outlet of the hydraulic pump through hydraulic pipelines, and the other end of the reverse drive control device is connected with forward rotation oil inlets and reverse rotation oil inlets of the first hydraulic motor and the second hydraulic motor through hydraulic pipelines; the reverse drive controller is electrically connected with the reverse drive control device and is used for controlling the opening and closing of each valve in the reverse drive control device, protecting a hydraulic system of the hydraulic traveling vehicle and avoiding overhigh pressure in the hydraulic system and reverse dragging of an engine; the hydraulic system integrates an overflow valve, a switch valve, a throttle valve and a sensor, can be suitable for vehicles with one or more hydraulic running working conditions, prevents the engine from being reversely dragged, and simultaneously buffers reverse acting energy in the hydraulic system.
Description
Technical Field
The invention belongs to the technical field of back-drive control, and particularly relates to a novel hydraulic traveling back-drive control system.
Background
In order to ensure the speed stability of a vehicle running on a downhill road section, the hydraulic running system of the engineering machinery, in particular to a low constant speed hydraulic running system of the railway engineering machinery, is provided with a back-driving control valve, and the back-driving control valve is adjusted to a certain pressure value, so that proper reverse braking force can be generated, and the engine is prevented from being dragged backwards. The existing back-drive control valve has the following defects: the existing hydraulic traveling reverse driving control valve is generally manually adjusted, only has one maximum reverse braking pressure value, is only suitable for the traditional vehicle with only one hydraulic traveling working condition, and is not suitable for the vehicle with two or more hydraulic traveling working conditions, namely the vehicle with high-speed hydraulic traveling and low-constant-speed hydraulic traveling working conditions; therefore, the conventional hydraulic traveling reverse drive control valve has a very limited effect.
Disclosure of Invention
The invention aims to provide a novel hydraulic traveling back-driving control system aiming at the defects in the prior art, integrates an overflow valve, a switch valve, a throttle valve and a sensor, can be suitable for vehicles with one or more hydraulic traveling working conditions, prevents an engine from dragging backwards, and simultaneously buffers reverse acting energy in a hydraulic system.
In order to achieve the above object, the present invention provides a novel hydraulic traveling back-drive control system, comprising:
one end of the reverse drive control device is connected with a first oil outlet and a second oil outlet of the hydraulic pump through hydraulic pipelines, and the other end of the reverse drive control device is connected with forward rotation oil inlets and reverse rotation oil inlets of the first hydraulic motor and the second hydraulic motor through hydraulic pipelines;
and the back drive controller is electrically connected with the back drive control device and is used for controlling the opening and closing of each valve in the back drive control device, protecting a hydraulic system of the hydraulic traveling vehicle and avoiding overhigh pressure in the hydraulic system and back dragging of the engine.
Optionally, the reverse-drive control device includes a first electric proportional overflow valve and a second electric proportional overflow valve connected in parallel inside the device, an oil inlet of the first electric proportional overflow valve is connected to reverse rotation oil inlets of the first hydraulic motor and the second hydraulic motor through a hydraulic pipeline, and an oil return port of the first electric proportional overflow valve is connected to forward rotation oil inlets of the first hydraulic motor and the second hydraulic motor through a hydraulic pipeline.
Optionally, an oil inlet of the second electric proportional overflow valve is connected with forward rotation oil inlets of the first hydraulic motor and the second hydraulic motor through a hydraulic pipeline, and an oil return port of the second electric proportional overflow valve is connected with reverse rotation oil inlets of the first hydraulic motor and the second hydraulic motor through a hydraulic pipeline.
Optionally, an oil inlet of the first electric proportional relief valve is connected with a first pressure sensor, and the first pressure sensor is communicated with reverse oil inlets of the first hydraulic motor and the second hydraulic motor.
Optionally, an oil inlet of the second electric proportional overflow valve is connected with a second pressure sensor, and the second pressure sensor is communicated with forward rotation oil inlets of the first hydraulic motor and the second hydraulic motor.
Optionally, the reverse drive control device further comprises a throttle valve, and two ends of the throttle valve are connected with the first oil outlet and the second oil outlet of the hydraulic pump through hydraulic pipelines.
Optionally, one end of the throttle valve is connected with an electromagnetic switch valve, and the other end of the electromagnetic switch valve is communicated with the first oil outlet or the second oil outlet of the hydraulic pump.
Optionally, the first electric proportional overflow valve and the second electric proportional overflow valve are both electrically connected with the back drive controller, and the back drive controller controls the magnitude of current introduced into the first electric proportional overflow valve and the second electric proportional overflow valve according to different vehicle operating conditions, so as to control the opening pressures of the first electric proportional overflow valve and the second electric proportional overflow valve.
Optionally, the first pressure sensor and the second pressure sensor are electrically connected to the back drive controller, and are respectively used for measuring pressure values in hydraulic pipelines on one sides of the reverse rotation oil inlet and the forward rotation oil inlet of the first hydraulic motor and the second hydraulic motor, and conveying the pressure values to the back drive controller.
Optionally, the electromagnetic switch valve is electrically connected with the back drive controller, and the back drive controller controls the opening and closing of the electromagnetic switch valve according to pressure values in the hydraulic pipeline measured by the first pressure sensor and the second pressure sensor.
The invention provides a novel hydraulic traveling back-drive control system, which has the beneficial effects that:
1. the back drive control valve has high integration level and integrates an overflow valve, a switch valve, a throttle valve and a sensor into a whole;
2. the anti-driving control valve has high automation degree, and all functions and debugging processes are realized through electrical control;
3. the reverse driving control valve can be suitable for vehicles with one or more hydraulic running working conditions, such as vehicles with high-speed hydraulic running and low-constant-speed hydraulic running working conditions, and can protect hydraulic system equipment no matter in running working conditions or operation working conditions when the vehicles run at high speed or low speed on a downhill or emergency braking occurs in normal running, so that the hydraulic system is prevented from being overhigh in pressure and reverse dragging of an engine, and meanwhile, the reverse driving control valve can play a role in buffering instant reverse acting energy of the hydraulic system.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts throughout.
FIG. 1 shows a block diagram of a novel hydraulic traveling back-drive control system according to an embodiment of the invention.
Description of reference numerals:
1. a back drive control device; 2. a hydraulic conduit; 3. a hydraulic pump; 4. a first oil outlet; 5. a second oil outlet; 6. a first hydraulic motor; 7. a second hydraulic motor; 8. a positive rotation oil inlet; 9. the oil inlet is reversed; 10. a first electric proportional relief valve; 11. a second electric proportional relief valve; 12. an oil inlet; 13. an oil return port; 14. a first pressure sensor; 15. a second pressure sensor; 16. a throttle valve; 17. an electromagnetic on-off valve; 18. an engine; 19. an axle.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The invention provides a novel hydraulic traveling back-drive control system, which comprises:
one end of the reverse drive control device is connected with a first oil outlet and a second oil outlet of the hydraulic pump through hydraulic pipelines, and the other end of the reverse drive control device is connected with forward rotation oil inlets and reverse rotation oil inlets of the first hydraulic motor and the second hydraulic motor through hydraulic pipelines;
and the back drive controller is electrically connected with the back drive control device and is used for controlling the opening and closing of each valve in the back drive control device, protecting a hydraulic system of the hydraulic traveling vehicle and avoiding overhigh pressure in the hydraulic system and back dragging of the engine.
When the hydraulic walking vehicle runs, the engine drives the hydraulic pump, and a first oil outlet and a second oil outlet of the hydraulic pump are respectively connected with forward rotation oil inlets and reverse rotation oil inlets of a first hydraulic motor and a second hydraulic motor at two ends of an axle through hydraulic pipelines to drive forward rotation and reverse rotation of the axle; the reverse drive control device is arranged at two ends of a first oil outlet and a second oil outlet of a hydraulic pump of the hydraulic walking vehicle and is connected with the first hydraulic motor and the second hydraulic motor in parallel; the reverse driving control device is internally provided with a first electric proportional overflow valve and a second electric proportional overflow valve which have opposite working oil circuit directions and are respectively connected with two ends of a forward rotation oil inlet and a reverse rotation oil inlet of a first hydraulic motor and a second hydraulic motor through hydraulic pipelines, and the first electric proportional overflow valve and the second electric proportional overflow valve are controlled by a reverse driving controller according to different running conditions of a vehicle by opening pressure; when the vehicle runs in the forward direction, the hydraulic pump outputs oil from the first oil outlet, the first electric proportional overflow valve is a reverse overflow valve, and the second electric proportional overflow valve is a forward overflow valve; when the vehicle runs under the working condition of low constant speed operation, the opening direction of the first electric proportional overflow valve is opposite to the direction of an oil way, and the reverse drive controller controls the opening pressure of the reverse overflow valve set by the first electric proportional overflow valve to be higher, so that sufficient reverse torque is generated when the vehicle runs on a downhill, and the stability of the relative constant speed of the vehicle in the downhill process is ensured; when the vehicle runs under a high-speed running working condition, the back drive controller controls the opening pressure of a reverse overflow valve set by the first electric proportional overflow valve to be smaller, so that the reverse torque generated by the vehicle during downhill running operation or emergency braking is ensured to be smaller, and the rotating speed of an engine is ensured not to be dragged to be high during downhill running operation or emergency braking; in the process, the opening pressure value of the second electric proportional overflow valve in the same direction as the oil path of the first oil outlet of the hydraulic pump is always kept at the maximum design pressure value of the system.
Further, if the traveling direction of the hydraulic traveling vehicle is opposite to the condition, the hydraulic pump outputs oil from the second oil outlet, the second electric proportional overflow valve is a reverse overflow valve, and the first electric proportional overflow valve is a forward overflow valve; when the vehicle runs under the working condition of low constant speed operation, the opening direction of the second electric proportional overflow valve is opposite to the direction of the oil way, and the reverse drive controller controls the opening pressure of the reverse overflow valve set by the second electric proportional overflow valve to be larger, so that sufficient reverse torque is generated when the vehicle runs on a downhill, and the stability of the relative constant speed of the vehicle in the downhill process is ensured; when the vehicle runs under a high-speed running working condition, the back drive controller controls the opening pressure of a reverse overflow valve set by the second electric proportional overflow valve to be smaller, so that the reverse torque generated by the vehicle during downhill running operation or emergency braking is ensured to be smaller, and the rotating speed of an engine is ensured not to be dragged to be high during downhill running operation or emergency braking; in the process, the opening pressure value of the first electric proportional overflow valve in the same direction as the second oil outlet oil way of the hydraulic pump is always kept at the maximum design pressure value of the system.
In one example, the reverse drive control device comprises a first electric proportional overflow valve and a second electric proportional overflow valve which are connected in parallel inside the device, wherein an oil inlet of the first electric proportional overflow valve is connected with reverse rotation oil inlets of a first hydraulic motor and a second hydraulic motor through a hydraulic pipeline, and an oil return port of the first electric proportional overflow valve is connected with forward rotation oil inlets of the first hydraulic motor and the second hydraulic motor through a hydraulic pipeline.
Specifically, the opening direction of the first electric proportional overflow valve is opposite to the forward rotation direction of the first hydraulic motor and the second hydraulic motor, the first electric proportional overflow valve is a reverse overflow valve, when the vehicle runs on a downhill road section or decelerates, the pressure in the hydraulic pipeline on one side of the reverse rotation oil inlet of the first hydraulic motor and the second hydraulic motor rises, when the pressure value reaches the pressure value set by the controller for the first electric proportional overflow valve according to the working condition, the first electric proportional overflow valve is opened, the first electric proportional overflow valve starts to overflow into the hydraulic pipeline on one side of the forward rotation oil inlet of the first hydraulic motor and the second hydraulic motor, the pressure in the hydraulic system is prevented from being overhigh, and the engine is prevented from.
In one example, the oil inlet of the second electric proportional overflow valve is connected with the forward rotation oil inlets of the first hydraulic motor and the second hydraulic motor through a hydraulic pipeline, and the oil return port of the second electric proportional overflow valve is connected with the reverse rotation oil inlets of the first hydraulic motor and the second hydraulic motor through a hydraulic pipeline.
Specifically, the opening direction of the second electric proportional overflow valve is the same as the forward rotation direction of the first hydraulic motor and the second hydraulic motor, and the second electric proportional overflow valve is a forward overflow valve, and the opening pressure value of the second electric proportional overflow valve is always kept at the maximum design pressure value of the system.
In one example, a first pressure sensor is connected to an oil inlet of the first electric proportional relief valve, and the first pressure sensor is communicated with reverse oil inlets of the first hydraulic motor and the second hydraulic motor.
Specifically, the setting of first pressure sensor can real-time supervision first hydraulic motor and the second hydraulic motor reverse the pressure value in the oil inlet one side hydraulic pressure pipeline to carry it to in the controller is driven in, the controller is driven in opposite directions can be according to the switching of this pressure value control electromagnetic switch valve.
In one example, a second pressure sensor is connected to an oil inlet of the second electric proportional overflow valve, and the second pressure sensor is communicated with forward rotation oil inlets of the first hydraulic motor and the second hydraulic motor.
Specifically, the setting of second pressure sensor can real-time supervision first hydraulic motor and the second hydraulic motor corotation oil inlet pressure value in the hydraulic pressure pipeline of one side to carry it to in the controller is driven in the turn-over, the turn-over controller can be according to the switching of this pressure value control electromagnetic switch valve.
In one example, the reverse drive control device further comprises a throttle valve, and two ends of the throttle valve are connected with the first oil outlet and the second oil outlet of the hydraulic pump through hydraulic pipelines.
Specifically, the throttle valve is arranged, so that oil in the high-pressure oil way flows into the low-pressure oil way according to the set flow of the throttle valve when the pressure value in the hydraulic pipeline on one side of the forward rotation oil inlet or one side of the reverse rotation oil inlet of the first hydraulic motor and the second hydraulic motor is too high, and the instantaneous too high reverse pressure in the hydraulic system is avoided.
In one example, one end of the throttle valve is connected with an electromagnetic switch valve, and the other end of the electromagnetic switch valve is communicated with the first oil outlet or the second oil outlet of the hydraulic pump.
Specifically, the electromagnetic switch valve can be opened when the pressure value in the hydraulic pipeline on one side of the forward rotation oil inlet or one side of the reverse rotation oil inlet of the first hydraulic motor and the second hydraulic motor is too high, so that oil in the high-pressure oil way flows into the low-pressure oil way, and the pressure in the high-pressure oil way can be lowered to a set value as soon as possible by matching the overflow effect of the reverse overflow valve, so that the situation that the reverse pressure in the hydraulic system is too high instantly is avoided.
In one example, the first electric proportional overflow valve and the second electric proportional overflow valve are both electrically connected with the back drive controller, and the back drive controller controls the magnitude of current introduced into the first electric proportional overflow valve and the second electric proportional overflow valve according to different operating conditions of the vehicle, so as to control the opening pressures of the first electric proportional overflow valve and the second electric proportional overflow valve.
In one example, the first pressure sensor and the second pressure sensor are electrically connected with the back drive controller, and are respectively used for measuring pressure values in the hydraulic pipelines on one sides of the reverse rotation oil inlet and the forward rotation oil inlet of the first hydraulic motor and the second hydraulic motor, and transmitting the pressure values to the back drive controller.
In one example, the electromagnetic switch valve is electrically connected with a back-drive controller, and the back-drive controller controls the opening and closing of the electromagnetic switch valve according to pressure values in the hydraulic pipeline measured by the first pressure sensor and the second pressure sensor.
Examples
As shown in FIG. 1, the present invention provides a novel hydraulic traveling back-drive control system, comprising:
one end of the reverse drive control device 1 is connected with a first oil outlet 4 and a second oil outlet 5 of a hydraulic pump 3 through a hydraulic pipeline 2, and the other end of the reverse drive control device 1 is connected with a forward rotation oil inlet 8 and a reverse rotation oil inlet 9 of a first hydraulic motor 6 and a second hydraulic motor 7 through the hydraulic pipeline 2;
and the back drive controller is electrically connected with the back drive control device 1 and is used for controlling the opening and closing of each valve in the back drive control device 1, protecting a hydraulic system of the hydraulic walking vehicle and avoiding overhigh pressure in the hydraulic system and back dragging of the engine.
In the embodiment, the reverse drive control device 1 comprises a first electric proportional overflow valve 10 and a second electric proportional overflow valve 11 which are connected in parallel inside the device, an oil inlet 12 of the first electric proportional overflow valve 10 is connected with reverse rotation oil inlets 9 of the first hydraulic motor 6 and the second hydraulic motor 7 through a hydraulic pipeline 2, and an oil return port 13 of the first electric proportional overflow valve 10 is connected with forward rotation oil inlets 8 of the first hydraulic motor 6 and the second hydraulic motor 7 through the hydraulic pipeline 2.
In the embodiment, the oil inlet 12 of the second electric proportional pressure relief valve 11 is connected with the forward rotation oil inlets 8 of the first hydraulic motor 6 and the second hydraulic motor 7 through the hydraulic pipeline 2, and the oil return port 13 of the second electric proportional pressure relief valve 11 is connected with the reverse rotation oil inlets 9 of the first hydraulic motor 6 and the second hydraulic motor 7 through the hydraulic pipeline 2.
In the embodiment, a first pressure sensor 14 is connected to the oil inlet 12 of the first electric proportional relief valve 10, and the first pressure sensor 14 is communicated with the reverse oil inlets 9 of the first hydraulic motor 6 and the second hydraulic motor 7.
In the present embodiment, a second pressure sensor 15 is connected to the oil inlet 12 of the second electric proportional relief valve 11, and the second pressure sensor 15 is communicated with the forward rotation oil inlets 8 of the first hydraulic motor 6 and the second hydraulic motor 7.
In the present embodiment, the reverse drive control device 1 further comprises a throttle valve 16, and both ends of the throttle valve 16 are connected with the first oil outlet 4 and the second oil outlet 5 of the hydraulic pump 3 through the hydraulic pipeline 2.
In the present embodiment, one end of the throttle valve 16 is connected to an electromagnetic switch valve 17, and the other end of the electromagnetic switch valve 17 is communicated with the first oil outlet 4 or the second oil outlet 5 of the hydraulic pump 3.
In this embodiment, the first electric proportional relief valve 10 and the second electric proportional relief valve 11 are both electrically connected to the back drive controller, and the back drive controller controls the magnitude of the current introduced into the first electric proportional relief valve 10 and the second electric proportional relief valve 11 according to the difference of the vehicle operation conditions, so as to control the opening pressures of the first electric proportional relief valve 10 and the second electric proportional relief valve 11.
In this embodiment, the first pressure sensor 14 and the second pressure sensor 15 are both electrically connected to the back drive controller, and are respectively configured to measure pressure values in the hydraulic pipeline 2 at one sides of the reverse rotation oil inlet 9 and the forward rotation oil inlet 8 of the first hydraulic motor 6 and the second hydraulic motor 7, and transmit the pressure values to the back drive controller.
In this embodiment, the electromagnetic switch valve 17 is electrically connected to a back drive controller, and the back drive controller controls the opening and closing of the electromagnetic switch valve 17 according to the pressure values in the hydraulic pipeline 2 measured by the first pressure sensor 14 and the second pressure sensor 15.
In conclusion, when the novel hydraulic traveling reverse-drive control system provided by the invention is used, the reverse-drive control system is installed in a hydraulic system of a hydraulic traveling vehicle, the hydraulic traveling vehicle is driven by an engine 18 during operation, a first oil outlet 4 and a second oil outlet 5 of the hydraulic pump 3 are respectively connected with a forward rotation oil inlet 8 and a reverse rotation oil inlet 9 of a first hydraulic motor 6 and a second hydraulic motor 7 at two ends of an axle 19 through a hydraulic pipeline 2, and the forward rotation and the reverse rotation of the axle 19 are driven; the back-drive control device 1 is arranged at two ends of a first oil outlet 4 and a second oil outlet 5 of a hydraulic pump 3 of a hydraulic walking vehicle and is connected with a first hydraulic motor 6 and a second hydraulic motor 7 in parallel. When the vehicle travels in the forward direction, the opening direction of the first electric proportional relief valve 10 in the reverse drive control device 1 is opposite to the direction of the working oil path and is a reverse relief valve, and the opening direction of the second electric proportional relief valve 11 is the same as the direction of the working oil path and is a forward relief valve; the hydraulic pump 3 is provided with oil from a first oil outlet 4, a hydraulic pipeline 2 between the first oil outlet 4 and a forward rotation oil inlet 8 of the first hydraulic motor 6 and the second hydraulic motor 7 is a high-pressure oil way, and a hydraulic pipeline 2 between a second oil outlet 5 and a reverse rotation oil inlet 9 of the first hydraulic motor 6 and the second hydraulic motor 7 is a low-pressure oil way. When a vehicle runs on a downhill road section or braking occurs, a hydraulic pipeline 2 between a first oil outlet 4 and a first hydraulic motor 6 and a second hydraulic motor 7 positive rotation oil inlet 8 is a low-pressure oil way, and a hydraulic pipeline 2 between a second oil outlet 5 and a first hydraulic motor 6 and a second hydraulic motor 7 negative rotation oil inlet 9 is a high-pressure oil way; at this time, a large driving torque is generated in the hydraulic pump 3 in the same direction as the rotation direction of the engine 18, and the rotation speed of the engine 18 is dragged up or even overshot.
When the vehicle runs under a low constant speed working condition, the inertia of the vehicle is small, the pressure in a hydraulic pipeline 2 between a second oil outlet 5 and a reverse oil inlet 9 of a first hydraulic motor 6 and a second hydraulic motor 7 is also small when the vehicle runs on a downhill or is braked, the phenomenon that the rotating speed of an engine 18 is dragged to be high cannot be caused, the running speed of the vehicle is required to be kept relatively stable under the working condition, the opening direction of a first electric proportional overflow valve 10 is opposite to the direction of an oil way, and a reverse driving controller controls the opening pressure of a reverse overflow valve set by the first electric proportional overflow valve 10 to be large, so that enough reverse torque is generated when the vehicle runs on the downhill, and the stability of the relative constant speed in the downhill process of;
when the vehicle runs under a high-speed running working condition, the inertia of the vehicle is large, the pressure in a hydraulic pipeline 2 between a second oil outlet 5 and a reverse oil inlet 9 of a first hydraulic motor 6 and a second hydraulic motor 7 is also large when the vehicle runs on a downhill or is braked, a reverse driving controller controls the opening pressure of a reverse overflow valve set by a first electric proportional overflow valve 10 to be small, when a pressure value measured by a first pressure sensor is larger than a set value, the first electric proportional overflow valve 10 is opened, oil begins to overflow from a high-pressure oil way into a low-pressure oil way, the pressure in the high-pressure oil way is reduced, the reverse torque generated by the vehicle during downhill running operation or braking is ensured to be small, and therefore the rotating speed of an engine cannot be dragged to be high during the downhill or braking of.
In the above process, the opening pressure value of the second electric proportional relief valve 11 is always maintained at the system maximum design pressure value. In addition, when the pressure in the hydraulic pipeline 2 between the second oil outlet 5 and the reverse oil inlet 9 of the first hydraulic motor 6 and the second hydraulic motor 7 is too high to exceed a pressure value set in the reverse drive controller due to emergency braking of the vehicle or other factors, the reverse drive controller controls the electromagnetic switch valve 17 to be opened, and the oil flows into the hydraulic pipeline 2 between the first oil outlet 4 and the normal oil inlet 8 of the first hydraulic motor 6 and the second hydraulic motor 7 at a certain flow rate from the hydraulic pipeline 2 between the second oil outlet 5 and the reverse oil inlet 9 of the first hydraulic motor 6 and the second hydraulic motor 7 through the throttle valve 16; meanwhile, the first electric proportional overflow valve 10 is opened to realize overflow together, so that the pressure in the hydraulic pipeline 2 between the second oil outlet 5 and the reverse rotation oil inlets 9 of the first hydraulic motor 6 and the second hydraulic motor 7 is quickly reduced to be below a set value, and then the reverse drive controller controls the electromagnetic switch valve 17 to be closed; therefore, the overhigh pressure in the hydraulic system of the vehicle can be avoided, and the function of buffering the instant reverse action energy of the hydraulic system of the vehicle is realized.
The working process is the working condition of the reverse driving control system when the hydraulic traveling vehicle travels forwards, when the hydraulic traveling vehicle travels backwards, the opening direction of a second electric proportional overflow valve 11 in the reverse driving control device 1 is opposite to the direction of a working oil way and is a reverse overflow valve, and the opening direction of a first electric proportional overflow valve 10 is the same as the direction of the working oil way and is a forward overflow valve; the hydraulic pump 3 discharges oil from a second oil outlet 5, a hydraulic pipeline 2 between a first oil outlet 4 and a forward rotation oil inlet 8 of a first hydraulic motor 6 and a second hydraulic motor 7 is a low-pressure oil way, and a hydraulic pipeline 2 between the second oil outlet 5 and a reverse rotation oil inlet 9 of the first hydraulic motor 6 and the second hydraulic motor 7 is a high-pressure oil way; at this time, the working states of the first electric proportional relief valve and the second electric proportional relief valve are opposite to the working states of the vehicle running in the forward direction, and the same back-driving control function can be achieved.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (10)
1. The utility model provides a novel hydraulic pressure is walked and is driven control system, the setting is walked in the hydraulic system of vehicle at hydraulic pressure, the vehicle is walked to hydraulic pressure passes through the engine drive hydraulic pump, first hydraulic motor and the second hydraulic motor at hydraulic pump drive axletree both ends, and then realize the hydraulic pressure and walk the line of going of vehicle, the hydraulic pump is provided with first oil-out and second oil-out, first oil-out and second oil-out are connected with the corotation oil inlet and the reversal oil inlet of first hydraulic motor and second hydraulic motor through corotation hydraulic conduit and reversal hydraulic pipeline respectively, a serial communication port, this is driven control system and is included:
one end of the reverse drive control device is connected with a first oil outlet and a second oil outlet of the hydraulic pump through hydraulic pipelines, and the other end of the reverse drive control device is connected with forward rotation oil inlets and reverse rotation oil inlets of the first hydraulic motor and the second hydraulic motor through hydraulic pipelines;
and the back drive controller is electrically connected with the back drive control device and is used for controlling the opening and closing of each valve in the back drive control device, protecting a hydraulic system of the hydraulic traveling vehicle and avoiding overhigh pressure in the hydraulic system and back dragging of the engine.
2. The novel hydraulic traveling reverse-drive control system according to claim 1, wherein the reverse-drive control device comprises a first electric proportional overflow valve and a second electric proportional overflow valve which are connected in parallel inside the device, an oil inlet of the first electric proportional overflow valve is connected with reverse rotation oil inlets of the first hydraulic motor and the second hydraulic motor through a hydraulic pipeline, and an oil return port of the first electric proportional overflow valve is connected with forward rotation oil inlets of the first hydraulic motor and the second hydraulic motor through a hydraulic pipeline.
3. The novel hydraulic traveling reverse-drive control system according to claim 2, wherein the oil inlet of the second electric proportional overflow valve is connected with the forward rotation oil inlets of the first hydraulic motor and the second hydraulic motor through a hydraulic pipeline, and the oil return port of the second electric proportional overflow valve is connected with the reverse rotation oil inlets of the first hydraulic motor and the second hydraulic motor through a hydraulic pipeline.
4. The novel hydraulic traveling backdrive control system according to claim 2, wherein a first pressure sensor is connected to an oil inlet of the first electric proportional overflow valve, and the first pressure sensor is communicated with reverse oil inlets of the first hydraulic motor and the second hydraulic motor.
5. The novel hydraulic traveling reverse-driving control system according to claim 4, wherein a second pressure sensor is connected to an oil inlet of the second electric proportional overflow valve, and the second pressure sensor is communicated with forward rotation oil inlets of the first hydraulic motor and the second hydraulic motor.
6. The novel hydraulic traveling back-drive control system as claimed in claim 1, wherein the back-drive control device further comprises a throttle valve, and two ends of the throttle valve are connected with the first oil outlet and the second oil outlet of the hydraulic pump through hydraulic pipelines.
7. The novel hydraulic traveling back-drive control system according to claim 6, wherein one end of the throttle valve is connected with an electromagnetic switch valve, and the other end of the electromagnetic switch valve is communicated with the first oil outlet or the second oil outlet of the hydraulic pump.
8. The novel hydraulic running reverse-driving control system according to claim 2, wherein the first electric proportional overflow valve and the second electric proportional overflow valve are both electrically connected with the reverse-driving controller, and the reverse-driving controller controls the magnitude of currents introduced into the first electric proportional overflow valve and the second electric proportional overflow valve according to different vehicle running conditions so as to control the opening pressures of the first electric proportional overflow valve and the second electric proportional overflow valve.
9. The novel hydraulic traveling reverse-drive control system according to claim 5, wherein the first pressure sensor and the second pressure sensor are electrically connected with a reverse-drive controller, and are respectively used for measuring pressure values in hydraulic pipelines on one sides of reverse rotation oil inlets and forward rotation oil inlets of the first hydraulic motor and the second hydraulic motor and conveying the pressure values to the reverse-drive controller.
10. The novel hydraulic running back-drive control system according to claim 7, wherein the electromagnetic switch valve is electrically connected with a back-drive controller, and the back-drive controller controls the electromagnetic switch valve to be opened and closed according to pressure values in the hydraulic pipeline measured by the first pressure sensor and the second pressure sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911110235.5A CN110805581A (en) | 2019-11-14 | 2019-11-14 | Novel hydraulic traveling reverse drive control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911110235.5A CN110805581A (en) | 2019-11-14 | 2019-11-14 | Novel hydraulic traveling reverse drive control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110805581A true CN110805581A (en) | 2020-02-18 |
Family
ID=69502508
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911110235.5A Pending CN110805581A (en) | 2019-11-14 | 2019-11-14 | Novel hydraulic traveling reverse drive control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110805581A (en) |
-
2019
- 2019-11-14 CN CN201911110235.5A patent/CN110805581A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103790874B (en) | Valveless Hydrauservo System and controlling method thereof | |
| CN105229345B (en) | Hydraulic system for double-clutch speed changer | |
| US8201404B2 (en) | Motor control device for construction machinery | |
| CN103313889B (en) | Braking device for vehicle | |
| CN105539132B (en) | Dual power drive system, engineering machinery vehicle and control method | |
| CN104061212A (en) | Electric hydraulic control running system for bracket carrier | |
| CN103482517A (en) | Constant tension control device of hydraulic winch | |
| CN103671364B (en) | Electrohydraulic control system is turned to for remote control loader | |
| JP2007255710A (en) | Fluid transfer circuit for controlling wear of wheel | |
| CN105546077A (en) | Hydrostatic braking concept | |
| CN104976341A (en) | Hydrostatic Traction Drive In Closed Hydraulic Circuit And Method For Controlling The Hydrostatic Traction Drive | |
| CN102030265B (en) | Crane hydraulic system for load sensitive ship | |
| CN109973452B (en) | Reverse braking control valve for hydraulic traveling system | |
| CN103144622A (en) | Automobile hydraulic braking device | |
| CN114475669B (en) | Automatic variable drive control system of monorail crane locomotive | |
| CN109027063B (en) | Variable-pressure yaw brake hydraulic system of wind generating set and control method thereof | |
| CN211116872U (en) | Novel hydraulic traveling reverse drive control system | |
| CN110805581A (en) | Novel hydraulic traveling reverse drive control system | |
| CN201922928U (en) | Hydraulic running differential device of snow thrower | |
| CN111120437B (en) | Multimode steering traveling system of engineering machinery | |
| CN110131122B (en) | Control method and system for preventing cylinder slipping of pumping system and pumping device | |
| RU2733670C1 (en) | Device for control of clamping force of current collector with relay valve | |
| CN103591282A (en) | Engineering machinery walking speed controlling and switching valve | |
| CN203412853U (en) | Four-motor single-side-walking and double-side-walking hydraulic system of bridge detection vehicle | |
| CN215257684U (en) | Hydrostatic drive system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination |