CN115320561A - Electro-hydraulic brake control system and tractor - Google Patents
Electro-hydraulic brake control system and tractor Download PDFInfo
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- CN115320561A CN115320561A CN202211034865.0A CN202211034865A CN115320561A CN 115320561 A CN115320561 A CN 115320561A CN 202211034865 A CN202211034865 A CN 202211034865A CN 115320561 A CN115320561 A CN 115320561A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/66—Electrical control in fluid-pressure brake systems
- B60T13/68—Electrical control in fluid-pressure brake systems by electrically-controlled valves
- B60T13/686—Electrical control in fluid-pressure brake systems by electrically-controlled valves in hydraulic systems or parts thereof
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Abstract
The invention relates to an electro-hydraulic brake control system and a tractor, wherein the electro-hydraulic brake control system comprises a controller, a brake mechanism, a brake valve bank and an oil supply mechanism, wherein the brake mechanism, the brake valve bank and the oil supply mechanism are respectively in communication connection with the controller; the oil supply mechanism and the brake valve set are communicated through a pipeline to form a circulation loop, and the brake valve set is also communicated with the brake mechanism through a pipeline. The invention has the advantages of simple structure, reasonable design, small brake pressure impact, small vehicle pause and contusion, and greatly improved service life of the brake and driving comfort; meanwhile, four brake valves are arranged, one or two brake valves output pressure oil required by a brake system, and the rest brake valves are standby, so that the running safety of the whole vehicle is enhanced; in addition, the intelligent degree of the braking system is high, the braking performance under the unmanned working condition can be achieved under the manual driving working condition, the unmanned and manual driving modes are in seamless connection, and the application range is wide.
Description
Technical Field
The invention relates to the technical field of tractor braking, in particular to an electro-hydraulic brake control system and a tractor.
Background
The tractor braking system is a core subsystem of the tractor and is related to the use safety performance of the tractor. The existing braking systems comprise a pure mechanical braking system, a hydraulic boosting braking system and an electro-hydraulic braking system. The electro-hydraulic brake system controls the hydraulic valve to output pressure through an electric signal, and outputs certain pressure and oil quantity to the brake to realize the braking of the vehicle. Along with the continuous improvement of tractor use weight, the required oil mass of stopper and pressure value also progressively improve, in addition, unmanned tractor also provided corresponding requirement to braking system.
The brake pedal is stepped on by a manual foot, the stepping force and the hydraulic resistance are converted into the brake pressure of brake oil by the brake master cylinder, the brake pressure acts on the brake to output the brake torque, the brake function is realized, and the mode has the following defects: a. the control of the brake pressure is realized through manual treading force, the accuracy of the pressure value is insufficient, and the pressure impact is large; b. the safety is not high because of no standby emergency braking measures; c. active braking under unmanned conditions cannot be achieved.
Disclosure of Invention
The technical problem to be solved by the invention is to provide
The technical scheme for solving the technical problems is as follows:
an electro-hydraulic brake control system comprises a controller, a brake mechanism, a brake valve bank and an oil supply mechanism, wherein the brake mechanism, the brake valve bank and the oil supply mechanism are respectively in communication connection with the controller; the oil supply mechanism and the brake valve group are communicated through a pipeline to form a circulation loop, and the brake valve group is further communicated with the brake mechanism through a pipeline.
The beneficial effects of the invention are: when the brake is not applied, the oil supply mechanism supplies oil and stores energy to prepare for subsequent brake operation; during braking, the oil supply mechanism supplies oil, and the controller controls the amount of oil reaching the braking mechanism by the braking valve group, so that accurate braking is realized, and the braking is stable; meanwhile, unmanned driving and manual driving can be achieved, and driving is convenient.
The invention has simple structure, reasonable design, small brake pressure impact and small vehicle pause feeling, greatly prolongs the service life of the brake mechanism and the driving comfort, and simultaneously enhances the running safety of the whole vehicle; in addition, the intelligent degree of the braking system is high, the braking performance under the unmanned working condition can be achieved under the manual driving working condition, the unmanned and manual driving modes are in seamless connection, and the application range is wide.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, the oil supply mechanism comprises an oil tank and a brake pump, wherein the inlet of the brake pump is communicated with the oil tank through an oil inlet pipeline, and the outlet of the brake pump is communicated with the oil inlet of the brake valve bank through an oil discharge pipeline; and an oil return port of the brake valve group is communicated with the oil tank through an oil return pipeline.
The further scheme has the advantages that when the brake is not applied, the brake valve group is not opened, pressure oil in the brake flows through the brake valve group and flows back to the oil tank, and the brake does not apply the brake; during braking, the brake valve bank is opened, oil in the oil tank is delivered to the brake valve bank through the brake pump and then delivered to the brake mechanism, and braking of wheels is achieved; meanwhile, the controller controls the brake valve group to control the oil amount sent to the brake mechanism, so that accurate braking is realized, and the braking is stable.
Further, an oil suction filter is fixedly arranged on the oil inlet pipeline corresponding to the inlet of the brake pump.
The beneficial effects of adopting above-mentioned further scheme are that simple structure, reasonable in design, the brake pump delivers to the in-process of brake valve group with the fluid in the oil tank, at first filters fluid through the oil absorption filter, gets rid of the impurity in the fluid, avoids the impurity in the fluid to influence the working property of each part, guarantees the normal operating of each part.
The oil supply mechanism further comprises an energy accumulator and a liquid charging valve, wherein the liquid charging valve is provided with a first interface, a second interface and a third interface, and the second interface can be connected with or disconnected from the first interface; the energy accumulator is communicated with the oil discharge pipeline through an energy accumulation pipeline, an energy accumulation pressure sensor is fixedly mounted on the energy accumulation pipeline, and the energy accumulation pressure sensor is in communication connection with the controller; the first connector is communicated with the oil discharge pipeline through a pipeline, the second connector is communicated with the oil tank through a pipeline, and the third connector is communicated with the energy accumulator through a pipeline.
The technical scheme has the advantages that when the brake is not performed, the liquid charging valve is not opened, oil in the oil tank is sent to the energy accumulator through the brake pump, meanwhile, the pressure in the energy accumulator is detected through the energy storage pressure sensor, and a corresponding pressure signal is sent to the controller; when the oil in the energy accumulator reaches a set amount, the liquid filling valve is opened, the second interface is communicated with the first interface, and the oil pumped by the brake pump directly flows back to the oil tank through the liquid filling valve, so that the excessive pressure in the system is avoided, and the normal operation of the system is ensured;
during braking, the brake pump continuously sends out oil in the oil tank, and meanwhile the energy accumulator supplies oil to the brake valve group, so that the brake mechanism brakes.
Furthermore, a one-way valve is fixedly arranged on the oil discharge pipeline corresponding to the position between the oil discharge pipeline and the communication position of the energy accumulator and the liquid charging valve.
The hydraulic brake system has the advantages that the hydraulic brake system is simple in structure and reasonable in design, when the pressure in the energy accumulator reaches the set pressure value through the check valve, the oil pressure of the energy accumulator and the oil discharging pipeline is basically unchanged, and meanwhile, oil sent by the brake pump can only flow back to the oil tank through the liquid charging valve.
Furthermore, the brake valve group comprises two brake valve blocks, a main oil inlet, a main oil outlet and a main oil return port are respectively arranged on the two brake valve blocks, and each main oil inlet can be respectively communicated with the corresponding main oil outlet and the corresponding main oil return port;
the two main oil inlets are respectively communicated with the oil discharge pipeline through pipelines, and the two main oil return ports are respectively communicated with the oil return pipeline through pipelines; the braking mechanism comprises two brakes which are respectively communicated with the two main oil outlets through braking pipelines; and the two brake pipelines are respectively and fixedly provided with a brake pressure sensor, and the two brake pressure sensors are respectively in communication connection with the controller.
The further scheme has the advantages that during braking, the two brake valve blocks are opened, oil liquid sent by the energy accumulator or/and the brake pump is respectively sent to the two brakes through the two brake valve blocks, and then the wheels on the two sides of the vehicle are braked through the two brakes, so that the braking is convenient; in the process, the two brake pressure sensors are used for respectively detecting the brake pressures of the two brakes and sending corresponding pressure signals to the controller, and the controller is used for receiving the corresponding pressure signals and controlling the opening degrees of the two brake valve blocks according to the pressure signals, so that the brake pressure values of the two brakes are adjusted, accurate braking is realized, and braking is convenient.
The mechanical brake mechanism is respectively communicated with the two brake pipelines, and the communication positions of the mechanical brake mechanism and the two brake pipelines are respectively and fixedly provided with a first shuttle valve; the displacement sensor is in communication connection with the controller and is used for detecting the displacement of the pedal in the mechanical braking mechanism.
The technical scheme has the advantages that during manual driving, a pedal in the mechanical brake mechanism is manually treaded during braking, the displacement and the moving speed of the pedal are detected through the displacement sensor, the corresponding displacement and moving speed signals are sent to the controller, the controller judges the brake pressure values of the two brakes according to the displacement and the moving speed, accurate braking is achieved, and braking is convenient.
Furthermore, the two brake valve blocks respectively comprise at least one brake control valve, the brake control valves are respectively provided with an oil inlet, an oil outlet and an oil return port, and each oil inlet can be respectively communicated with the corresponding oil outlet or the corresponding oil return port;
the two oil inlets are communicated with the oil discharge pipeline through pipelines respectively, the two oil return ports are communicated with the oil return pipeline through pipelines respectively, and the two oil outlets are communicated with one ends of the two brake pipelines respectively.
The further scheme has the advantages that when the brake is carried out, the two brake control valves are opened, oil liquid sent by the brake pump is respectively sent to the two brakes through the two brake control valves, and then the wheels on the two sides of the vehicle are braked through the two brakes, so that the brake is convenient; in the process, the two brake pressure sensors are used for respectively detecting the brake pressures of the two brakes and sending corresponding pressure signals to the controller, and the controller receives the corresponding pressure signals and controls the opening degrees of the two brake control valves according to the pressure signals, so that the brake pressure values of the two brakes are adjusted, accurate brake is realized, and the brake is convenient.
Furthermore, the two brake valve blocks respectively comprise a plurality of brake control valves, the brake control valves in each brake valve block are distributed in parallel, the oil outlets are respectively communicated with one ends of the corresponding brake pipelines, and a second shuttle valve is fixedly installed at one end of each of the two brake pipelines.
The beneficial effect of adopting above-mentioned further scheme is simple structure, reasonable in design, and when a plurality of brake control valves started simultaneously, when the fluid of a plurality of brake control valves punishment flowed to shuttle valve two respectively and the fluid of the brake control valve department that pressure is big flowed to the stopper through shuttle valve two, realizes steady braking.
The vehicle speed detector is in communication connection with the controller and is used for detecting the rotating speed of the wheels.
The beneficial effects of adopting above-mentioned further scheme are that simple structure, reasonable in design, when unmanned, through the speed detector speed of a motor vehicle detection vehicle to give the controller to corresponding speed signal transmission, the controller receives corresponding speed signal and controls the degree of opening of two brake valve blocks according to corresponding speed signal, thereby controls two brakes and brakes, and the braking is convenient.
The invention also relates to a tractor comprising the electro-hydraulic brake control system.
The technical scheme has the advantages that the technical scheme is simple in structure, reasonable in design, small in brake pressure impact, small in vehicle pause and pause feeling, and greatly prolongs the service life of the brake and improves driving comfort; meanwhile, two brakes are arranged, one brake executes braking, and the other brake is standby, so that the running safety of the whole vehicle is enhanced; in addition, the intelligent degree of the braking system is high, the braking performance under the unmanned working condition can be achieved under the manual driving working condition, the unmanned and manual driving modes are in seamless connection, and the application range is wide.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic structural view of the present invention when the brake is not applied and the accumulator is storing energy;
FIG. 3 is a schematic structural view of the present invention when the brake is not applied and the accumulator is not accumulating energy;
fig. 4 is a schematic structural view of the present invention during braking.
In the drawings, the components represented by the respective reference numerals are listed below:
1. a controller; 2. an oil tank; 3. a brake pump; 4. an oil absorption filter; 5. an accumulator; 6. a liquid charging valve; 7. an energy storage pressure sensor; 8. a one-way valve; 9. a brake; 10. a brake pressure sensor; 11. a mechanical braking mechanism; 12. a first shuttle valve; 13. a brake control valve; 14. a second shuttle valve; 15. a displacement sensor; 16. a vehicle speed detector; 17. a pedal; 18. a brake cylinder; 19. the brake oil can.
Detailed Description
It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate a number of the indicated technical features. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected 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 through specific situations.
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Example 1
As shown in fig. 1 to 4, the embodiment provides an electro-hydraulic brake control system, which includes a controller 1, a brake mechanism, a brake valve set, and an oil supply mechanism, where the brake mechanism, the brake valve set, and the oil supply mechanism are respectively in communication connection with the controller 1; the oil supply mechanism and the brake valve set are communicated through a pipeline to form a circulation loop, and the brake valve set is also communicated with the brake mechanism through a pipeline.
When the brake is not applied, the oil supply mechanism supplies oil and stores energy to prepare for the subsequent brake operation; during braking, the oil supply mechanism supplies oil, the controller 1 controls the amount of oil reaching the braking mechanism by the braking valve group, accurate braking is realized, and braking is stable; meanwhile, unmanned driving and manual driving can be achieved, and driving is convenient.
The brake mechanism has the advantages that the structure is simple, the design is reasonable, the brake pressure impact is small, the whole vehicle pause feeling is small, the service life and the driving comfort degree of the brake mechanism are greatly improved, and meanwhile, the running safety of the whole vehicle is enhanced; in addition, the intelligent degree of the braking system is high, the braking performance under the unmanned working condition can be achieved under the manual driving working condition, the unmanned and manual driving modes are in seamless connection, and the application range is wide.
Example 2
On the basis of the embodiment 1, in the embodiment, the oil supply mechanism comprises an oil tank 2 and a brake pump 3, wherein the inlet of the brake pump 3 is communicated with the oil tank 2 through an oil inlet pipeline, and the outlet of the brake pump is communicated with the oil inlet of the brake valve group through an oil discharge pipeline; an oil return port of the brake valve group is communicated with the oil tank 2 through an oil return pipeline.
When not braking, the brake valve set is not opened, and braking is carried out
The pressure oil in the device flows through the brake valve group and flows back to the oil tank 2, and the brake does not brake; during braking, the brake valve group is opened, oil in the oil tank 2 is sent to the brake valve group through the brake pump 3 and then sent to the brake mechanism, and braking of the wheels is achieved; meanwhile, the controller 1 controls the brake valve group to control the oil amount sent to the brake mechanism, so that accurate braking is realized, and the braking is stable.
Example 3
In addition to embodiment 2, in this embodiment, an oil suction filter 4 is fixedly installed on the oil inlet pipeline at a position corresponding to the inlet of the brake pump 3.
This scheme simple structure, reasonable in design, brake pump 3 delivers to the in-process of brake valve group with the fluid in the oil tank 2, at first filters fluid through oil absorption filter 4, gets rid of the impurity in the fluid, avoids the impurity in the fluid to influence the working property of each part, guarantees the normal operating of each part.
Preferably, in this embodiment, the oil absorption filter 4 is made by using the prior art, and the specific structure and principle thereof are not described herein again.
Example 4
On the basis of any one of embodiments 2 to 3, in this embodiment, the oil supply mechanism further includes an energy accumulator 5 and a charging valve 6, the charging valve 6 is provided with a first interface, a second interface and a third interface, and the second interface can be connected with or disconnected from the first interface; the energy accumulator 5 is communicated with the oil discharge pipeline through an energy accumulation pipeline, an energy accumulation pressure sensor 7 is fixedly installed on the energy accumulation pipeline, and the energy accumulation pressure sensor 7 is in communication connection with the controller 1; the first interface is communicated with an oil discharge pipeline through a pipeline, the second interface is communicated with the oil tank 2 through a pipeline, the third interface is communicated with the energy accumulator 5 through a pipeline, and oil flowing into the liquid charging valve 6 from the third interface can push the valve core of the liquid charging valve 6 to move so that the first interface is communicated with or disconnected from the second interface.
When the brake is not performed, the liquid charging valve 6 is not opened, oil in the oil tank 2 is sent to the energy accumulator 5 through the brake pump 3, meanwhile, the pressure in the energy accumulator 5 is detected through the energy accumulation pressure sensor 7, and a corresponding pressure signal is sent to the controller 1; when the oil in the energy accumulator 5 reaches a set amount, the liquid charging valve 6 is opened, the second interface is communicated with the first interface, and the oil sent by the brake pump 3 directly flows back to the oil tank 2 through the liquid charging valve 6, so that the excessive pressure in the system is avoided, and the normal operation of the system is ensured;
during braking, the brake pump 3 continuously sends out oil in the oil tank 2, and meanwhile the energy accumulator 5 supplies oil to the brake valve group, so that the brake mechanism brakes.
Example 5
In addition to embodiment 4, in this embodiment, a check valve 8 is fixedly installed on the oil discharge pipe at a position corresponding to a position between the oil discharge pipe and a position where the oil discharge pipe communicates with the accumulator 5 and the charge valve 6.
The scheme is simple in structure and reasonable in design, when the pressure in the energy accumulator 5 reaches a set pressure value through the check valve 8, the oil pressure of the energy accumulator 5 and the oil discharging pipeline is basically unchanged, and meanwhile, oil sent by the brake pump 3 can only flow back to the oil tank 2 through the liquid charging valve 6.
Example 6
On the basis of any one of embodiments 2 to 5, in this embodiment, the brake valve group includes two brake valve blocks, a main oil inlet, a main oil outlet, and a main oil return port are respectively provided on the two brake valve blocks, and each main oil inlet can be respectively communicated with the corresponding main oil outlet and the corresponding main oil return port;
the two main oil inlets are respectively communicated with an oil discharge pipeline through pipelines, and the two main oil return ports are respectively communicated with an oil return pipeline through pipelines; the braking mechanism comprises two brakes 9, and the two brakes 9 are respectively communicated with the two main oil outlets through braking pipelines; and the two brake pipelines are respectively and fixedly provided with a brake pressure sensor 10, and the two brake pressure sensors 10 are respectively in communication connection with the controller 1.
During braking, the two brake valve blocks are opened, oil liquid sent by the energy accumulator 5 or/and the brake pump 3 is respectively sent to the two brakes 9 through the two brake valve blocks, and then the wheels on the two sides of the vehicle are braked through the two brakes 9, so that the braking is convenient; in the process, the two brake pressure sensors 10 are used for respectively detecting the brake pressures of the two brakes 9 and sending corresponding pressure signals to the controller 1, and the controller 1 receives the corresponding pressure signals and controls the opening degrees of the two brake valve blocks according to the pressure signals, so that the brake pressure values of the two brakes 9 are adjusted, accurate braking is realized, and braking is convenient.
Preferably, in the present embodiment, the two brakes 9 are a left brake and a right brake, respectively, and the left brake and the right brake are in transmission connection with wheels on the left side and the right side of the vehicle, respectively, and are used for braking the wheels on the left side and the right side of the vehicle, respectively.
Preferably, in this embodiment, the two brake pressure sensors 10 may be directly and fixedly mounted on the two brake pipes, respectively, and the detection ends thereof extend into the two brake pipes, respectively; or the two brake pressure sensors 10 are respectively and fixedly arranged at one end of the detection pipeline, and the other ends of the two detection pipelines are respectively communicated with the two brake pipelines.
Example 7
On the basis of the embodiment 6, the embodiment further comprises a mechanical braking mechanism 11 and a displacement sensor 15, wherein the mechanical braking mechanism 11 is respectively communicated with the two brake pipelines, and the communicated parts of the mechanical braking mechanism 11 and the two brake pipelines are respectively and fixedly provided with a shuttle valve I12; the displacement sensor 15 is connected to the controller 1 for detecting the displacement of the pedal in the mechanical brake mechanism 11.
During manual driving, during braking, the pedal 17 in the mechanical braking mechanism 11 is manually stepped on, the displacement and the moving speed of the pedal are detected through the displacement sensor 15, and corresponding displacement and moving speed signals are sent to the controller 1, and the controller 1 judges the braking pressure values of the two brakes 9 according to the displacement and the moving speed, so that accurate braking is realized, and braking is convenient.
Preferably, in this embodiment, the mechanical brake mechanism 11 adopts the prior art, and specifically includes two brake cylinders 18 and two pedals 17, the rod cavities of the two brake cylinders 18 are respectively communicated with the two brake pipelines through pipelines, and the two pedals 17 are respectively fixedly connected with the pistons in the two brake cylinders 18 through connecting rods.
In addition, the mechanical brake mechanism 11 further comprises a brake oil can 19, and an oil outlet of the brake oil can 19 is respectively communicated with the two brake oil cylinders 18 and a pipeline communicated between the two brake pipelines through pipelines, and is used for supplementing oil to the mechanical brake mechanism 11.
Preferably, in this embodiment, when the oil and the brake valve block in the mechanical brake mechanism 11 simultaneously supply oil to the corresponding brake 9 and the two paths of oil reach the first shuttle valve 12, respectively, the oil with a larger pressure in the two paths of oil pushes the spool of the first shuttle valve 12 to block the oil with a smaller pressure, and the oil with a larger pressure is supplied to the brake 9. The scheme is applied to the condition of manual driving, and when the vehicle is not driven, the brake valve block is used for providing oil for the brake 9 to brake.
Example 8
On the basis of any one of embodiments 6 to 7, in this embodiment, each of the two brake valve blocks includes at least one brake control valve 13, the brake control valves 13 are respectively provided with an oil inlet, an oil outlet and an oil return port, and each oil inlet can be respectively communicated with the corresponding oil outlet or oil return port;
the two oil inlets are communicated with an oil discharge pipeline through pipelines respectively, the two oil return ports are communicated with an oil return pipeline through pipelines respectively, and the two oil outlets are communicated with one ends of the two brake pipelines respectively.
During braking, the two brake control valves 13 are opened, oil liquid sent by the brake pump 3 is respectively sent to the two brakes 9 through the two brake control valves 13, and then the wheels on the two sides of the vehicle are braked through the two brakes 9, so that the braking is convenient; in the process, the two brake pressure sensors 10 respectively detect the brake pressures of the two brakes 9, corresponding pressure signals are sent to the controller 1, and the controller 1 receives the corresponding pressure signals and controls the opening degrees of the two brake control valves 13 according to the pressure signals, so that the brake pressure values of the two brakes 9 are adjusted, accurate braking is realized, and braking is convenient.
Preferably, in the present embodiment, the two brake valve blocks respectively include a plurality of brake control valves 13, the plurality of brake control valves 13 in each brake valve block are distributed in parallel, the plurality of oil outlets are respectively communicated with one end of the corresponding brake pipeline, and one end of each of the two brake pipelines is fixedly provided with a second shuttle valve 14.
The scheme is simple in structure and reasonable in design, when the plurality of brake control valves 13 are started simultaneously, when oil at the plurality of brake control valves 13 flows to the second shuttle valve 14 respectively, and the oil at the brake control valve 13 with high pressure flows to the brake 9 through the second shuttle valve 14, so that stable braking is realized.
Preferably, in the present embodiment, the two brake valve blocks respectively include two brake control valves 13, and the two brake control valves 13 in each brake valve block are distributed in parallel.
Example 9
On the basis of any one of embodiment 6 to embodiment 9, the present embodiment further includes a vehicle speed detector 16, and the vehicle speed detector 16 is in communication connection with the controller 1 and is used for detecting the rotation speed of the wheel.
This scheme simple structure, reasonable in design, the speed of a motor vehicle is detected through speed detector 16 during unmanned driving to send controller 1 to the speed of a motor vehicle signal that corresponds, controller 1 receives the speed of a motor vehicle signal that corresponds and controls the opening degree of two brake valve blocks according to corresponding speed of a motor vehicle signal, thereby control two brakes 9 and brake, it is convenient to brake.
The vehicle speed detector 16 includes a plurality of vehicle speed sensors, each of which is fixedly mounted on a respective one of a plurality of wheels of the vehicle, is in communication with the controller 1, and is configured to detect a rotational speed of the respective one of the plurality of wheels.
The electronic components are connected to the controller 1 through lines.
Example 10
On the basis of the above embodiments, the present embodiment further provides a tractor including the electro-hydraulic brake control system as described above.
The scheme has the advantages of simple structure, reasonable design, small brake pressure impact, small vehicle pause feeling, and greatly prolonged service life of the brake and improved driving comfort; meanwhile, two brakes are arranged, one brake executes braking, and the other brake is standby, so that the running safety of the whole vehicle is enhanced; in addition, the intelligent degree of the braking system is high, the braking performance under the unmanned working condition can be achieved under the manual driving working condition, the unmanned and manual driving modes are in seamless connection, and the application range is wide.
The working principle of the invention is as follows:
(1) Hydraulic control principle:
all the valves are powered off, the brake pump 3 sucks oil from the oil tank 2, the oil is filtered by the oil suction filter 4 and flows through the one-way valve 8 to enter the inlets of the plurality of brake control valves 13, and meanwhile, the oil enters the energy accumulator 5 to finish charging and energy accumulation (see fig. 2);
when the charging pressure reaches P1 (set according to actual conditions), the charging valve 6 is opened, so that the flow supplied by the brake pump 3 is completely returned to the oil tank 2 through the charging valve 6 (see fig. 3), the low-pressure unloading effect is realized, the check valve 8 ensures that the pressure in the energy accumulator 5 is not reduced within a certain time range, and the vehicle is in an unbraked state.
When the two brake control valves 13 corresponding to the right brake receive the control signals and output pressure oil with pressure PA and pressure PB, the corresponding shuttle valve one 12 selects the pressure oil with the side with higher pressure from the two brake control valves PA and PB and outputs the pressure oil to the right side of the corresponding shuttle valve two 14.
When the two brake control valves 13 corresponding to the left brake receive the control signals and output pressure oil having pressures PC and PD, respectively, the pressure oil having the side having the higher pressure among the two PC and PD is selected for the corresponding shuttle valve one 12 and output to the right side of the corresponding shuttle valve two 14.
When the driver steps on the two pedals 17 with feet, the two brake pressure output ports of the two brake cylinders 18 respectively output the brake oil with the pressure of PmA and PmB to the left sides of the two shuttle valves I12, and the brake oil pot 19 is used for supplementing oil to the two brake cylinders 18.
The pressure oil on the side with larger pressure at the left side and the right side of the valve is selected corresponding to the shuttle valve I12 and output to the left brake, so that the left tire is braked; and the corresponding shuttle valve I12 selects the pressure oil on the side with larger pressure on the left side and the right side of the valve to output to the right brake, so that the right tire is braked. The two brake pressure sensors 10 detect brake pressure values of the left brake and the right brake, respectively (see fig. 4).
(2) The electrical control principle is as follows:
under the working condition of manual driving, two pedals 17 are stepped on by feet, the displacement sensor 15 obtains the actual displacement and the moving speed of the pedals 17, and the theoretical pressure minimum PB of the two brake pressure sensors 10 is judged according to the actual displacement and the moving speed min And PA min Actual measurement values of the two brake pressure sensors 10 are PB ' and PA ', if PB '<PB min The controller 1 outputs corresponding pressure value PB corresponding to the two brake control valves 13 min The left brake obtains the corresponding brake oil pressure to achieve the purpose of safe braking, and meanwhile, the controller 1 outputs brake failure alarm. If PA'<PA min The situation is similar.
Under the unmanned working condition, according to the set working area and the working speed, when the controller 1 judges that the tractor needs to be braked simultaneously from left to right, the controller 1 outputs a control signal, so that the two corresponding brake control valves output control pressures P ', and P' are final brake pressure values obtained by a left brake and a right brake. The actual control curves of the two brake control valves are adjusted according to the type of the brake, and if the brake 9 has a reset function, the control curves need to be set with larger prefill pressure and longer prefill time; if the brake 9 is provided without a reset function, the control curve can be set with a smaller priming pressure and shorter priming time or without a priming control section. The vehicle speed detector 16 obtains an actual vehicle speed V1, an actual deceleration K, a target vehicle speed V ', and a braking completion remaining time t = (V1-V')/K. When t =500ms, the control pressure P' decrease control strategy is as follows:
1. when t =500ms, the control pressure P' starts to decrease slowly;
2. when t =100ms, the control pressure P' starts decreasing rapidly;
3. when t =20ms, the control pressure P' is zero.
The control strategy is one of the control strategies, and the specific control strategy can be adjusted according to the actual situation.
When the two brake pressure sensors 10 detect that the brake pressure values of the left brake and the right brake are P ', one of the brake control valves 13 corresponding to the two brakes 9 outputs a control pressure P ", P' > P". P' is used for improving the corresponding speed of braking and enhancing the use safety of the tractor. When the brake pressure P 'is abnormally reduced due to a failure of any one of the brake control valves 13 corresponding to the two brakes 9, the controller 1 outputs a control signal such that the remaining brake control valves 13 corresponding to the two brakes 9 rapidly reach the brake pressure P', thereby ensuring the braking performance of the tractor.
When the controller 1 judges that the tractor needs unilateral braking, the controller 1 outputs a control signal to enable one of the brake control valves 13 corresponding to the two brakes 9 to output control pressure P ', and the control curve of P' is the same as that of left and right simultaneous braking, so that the turning with a small turning radius can be realized. The control strategy for adjusting the reduction of the control pressure P' according to the remaining time of braking is the same as that in the case of simultaneous left and right braking.
The energy storage pressure sensor 7 is used for detecting the oil supply pressure value of the brake system, and if the pressure is smaller than the minimum brake pressure, the controller 1 sends out a brake pressure low alarm.
In the invention, each brake control valve 13 is an electric proportional pressure reducing valve, and can control the output brake pressure according to the actual requirement.
In addition, under the unmanned driving working condition, each brake 9 is provided with two brake control valves 13; under the condition of manual driving, the controller 1 can automatically judge whether the brake system operated by the driver has a fault or not, and further control the brake control valve 13 to complete safe braking.
In addition, four shuttle valves are arranged in the system, and pressure oil with larger pressure is automatically selected for braking.
It should be noted that solid lines between two components in the drawings indicate lines, arrows in the lines indicate the direction in which the oil flows, and dotted lines between the respective components and the controller 1 indicate control lines.
In addition, the electronic components according to the present invention are conventionally used, and the components are electrically connected to a controller, and a control circuit between the controller and each component is conventionally used.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present specification describes embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and it is to be understood that all embodiments may be combined as appropriate by one of ordinary skill in the art to form other embodiments as will be apparent to those of skill in the art from the description herein.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. An electro-hydraulic brake control system, characterized by: the brake system comprises a controller (1), a brake mechanism, a brake valve bank and an oil supply mechanism, wherein the brake mechanism, the brake valve bank and the oil supply mechanism are respectively in communication connection with the controller (1); the oil supply mechanism and the brake valve group are communicated through a pipeline to form a circulation loop, and the brake valve group is also communicated with the brake mechanism through a pipeline.
2. The electro-hydraulic brake control system of claim 1, wherein: the oil supply mechanism comprises an oil tank (2) and a brake pump (3), wherein the inlet of the brake pump (3) is communicated with the oil tank (2) through an oil inlet pipeline, and the outlet of the brake pump is communicated with the oil inlet of the brake valve bank through an oil discharge pipeline; and an oil return port of the brake valve group is communicated with the oil tank (2) through an oil return pipeline.
3. The electro-hydraulic brake control system according to claim 2, characterized in that: and an oil absorption filter (4) is fixedly arranged on the oil inlet pipeline corresponding to the inlet of the brake pump (3).
4. The electro-hydraulic brake control system of claim 2, wherein: the oil supply mechanism further comprises an energy accumulator (5) and a liquid charging valve (6), wherein the liquid charging valve (6) is provided with a first connector, a second connector and a third connector, and the second connector can be connected with or disconnected from the first connector; the energy accumulator (5) is communicated with the oil discharge pipeline through an energy accumulation pipeline, an energy accumulation pressure sensor (7) is fixedly mounted on the energy accumulation pipeline, and the energy accumulation pressure sensor (7) is in communication connection with the controller (1); the first connector is communicated with the oil discharge pipeline through a pipeline, the second connector is communicated with the oil tank (2) through a pipeline, and the third connector is communicated with the energy accumulator (5) through a pipeline.
5. The electro-hydraulic brake control system of claim 4, wherein: and a one-way valve (8) is fixedly installed on the part of the oil discharge pipeline corresponding to the part between the oil discharge pipeline and the communication part of the energy accumulator (5) and the liquid charging valve (6).
6. The electro-hydraulic brake control system of any of claims 2-5, wherein: the brake valve group comprises two brake valve blocks, wherein a main oil inlet, a main oil outlet and a main oil return port are respectively arranged on the two brake valve blocks, and each main oil inlet can be respectively communicated with the corresponding main oil outlet and the corresponding main oil return port;
the two main oil inlets are respectively communicated with the oil discharge pipeline through pipelines, and the two main oil return ports are respectively communicated with the oil return pipeline through pipelines; the brake mechanism comprises two brakes (9), and the two brakes (9) are respectively communicated with the two main oil outlets through brake pipelines; and the two brake pipelines are respectively and fixedly provided with a brake pressure sensor (10), and the two brake pressure sensors (10) are respectively in communication connection with the controller (1).
7. The electro-hydraulic brake control system according to claim 6, wherein: the brake system is characterized by further comprising a mechanical brake mechanism (11) and a displacement sensor (15), wherein the mechanical brake mechanism (11) is respectively communicated with the two brake pipelines, and a shuttle valve I (12) is respectively fixedly installed at the communication position of the mechanical brake mechanism (11) and the two brake pipelines; the displacement sensor (15) is in communication connection with the controller (1) and is used for detecting the displacement of a pedal (17) in the mechanical brake mechanism (11).
8. The electro-hydraulic brake control system of claim 6, wherein: the two brake valve blocks respectively comprise at least one brake control valve (13), the brake control valves (13) are respectively provided with an oil inlet, an oil outlet and an oil return port, and each oil inlet can be respectively communicated with the corresponding oil outlet or the corresponding oil return port;
the two oil inlets are communicated with the oil discharge pipeline through pipelines respectively, the two oil return ports are communicated with the oil return pipeline through pipelines respectively, and the two oil outlets are communicated with one ends of the two brake pipelines respectively.
9. The electro-hydraulic brake control system of claim 6, wherein: the vehicle speed detection device is characterized by further comprising a vehicle speed detector (16), wherein the vehicle speed detector (16) is in communication connection with the controller (1) and is used for detecting the rotating speed of wheels.
10. A tractor, its characterized in that: comprising an electro-hydraulic brake control system according to any of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211034865.0A CN115320561A (en) | 2022-08-26 | 2022-08-26 | Electro-hydraulic brake control system and tractor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211034865.0A CN115320561A (en) | 2022-08-26 | 2022-08-26 | Electro-hydraulic brake control system and tractor |
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| Publication Number | Publication Date |
|---|---|
| CN115320561A true CN115320561A (en) | 2022-11-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211034865.0A Pending CN115320561A (en) | 2022-08-26 | 2022-08-26 | Electro-hydraulic brake control system and tractor |
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| Country | Link |
|---|---|
| CN (1) | CN115320561A (en) |
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2022
- 2022-08-26 CN CN202211034865.0A patent/CN115320561A/en active Pending
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