CN109249918A - Brake fluid system and vehicle - Google Patents

Brake fluid system and vehicle Download PDF

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Publication number
CN109249918A
CN109249918A CN201811126558.9A CN201811126558A CN109249918A CN 109249918 A CN109249918 A CN 109249918A CN 201811126558 A CN201811126558 A CN 201811126558A CN 109249918 A CN109249918 A CN 109249918A
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CN
China
Prior art keywords
brake
valve
accumulator
outlet
controller
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
Application number
CN201811126558.9A
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Chinese (zh)
Inventor
邓希来
邓云海
延伟
彭清祥
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hunan Province Ground Unmanned Equipment Engineering Research Center Co ltd
Original Assignee
Sany Automobile Manufacturing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sany Automobile Manufacturing Co Ltd filed Critical Sany Automobile Manufacturing Co Ltd
Priority to CN201811126558.9A priority Critical patent/CN109249918A/en
Publication of CN109249918A publication Critical patent/CN109249918A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60TVEHICLE 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
    • B60T13/00Transmitting 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
    • B60T13/10Transmitting 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
    • B60T13/12Transmitting 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 the fluid being liquid
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60TVEHICLE 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
    • B60T13/00Transmitting 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
    • B60T13/10Transmitting 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
    • B60T13/12Transmitting 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 the fluid being liquid
    • B60T13/14Transmitting 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 the fluid being liquid using accumulators or reservoirs fed by pumps
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60TVEHICLE 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
    • B60T15/00Construction arrangement, or operation of valves incorporated in power brake systems and not covered by groups B60T11/00 or B60T13/00
    • B60T15/02Application and release valves

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Braking Systems And Boosters (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)

Abstract

The invention proposes a kind of brake fluid system and vehicles, wherein brake fluid system includes: running brake;Parking brake;First accumulator, is connected with running brake;Second accumulator, the second accumulator are connected with parking brake;First check valve, the import of the first check valve are connected with the first accumulator, and the outlet of the first check valve is connected with the second accumulator;Oil pump, the oil outlet of oil pump are connected with the oil inlet and outlet of the first accumulator, and are connected by the first check valve with the oil inlet and outlet of the second accumulator.According to the technical solution of the present invention; it is connect respectively with running brake and parking brake using two accumulators; form two relatively independent circuits of service brake and parking braking; reduce the interference between service brake and parking brake loop; it is also provided for vehicle and send oily pressure maintaining, alarm, urgent parking braking, the quadruple protection of service brake auxiliary, greatly improve the safety and reliability of vehicle.

Description

Brake fluid system and vehicle
Technical field
The present invention relates to vehicle brake technology fields, in particular to a kind of brake fluid system and a kind of vehicle.
Background technique
Most of all-hydraulic service brake at present, using simple brake circuit, the safe design of system is insufficient.Work as oil circuit Components break down or leakage when, vehicle there are brake force not enough or brake failure dangerous situation.
Meanwhile service brake, generally using pressurization braking, parking braking also mostly brakes parking using hydraulic pressure maintaining, and logical Normal service brake and parking braking share accumulator, thus this braking system service brake can have an impact parking braking.
Summary of the invention
The present invention is directed to solve at least one of the technical problems existing in the prior art or related technologies.
In view of this, it is an object of the present invention to provide a kind of brake fluid systems.
It is another object of the present invention to provide a kind of vehicles.
To achieve the goals above, the technical solution of first aspect present invention provides a kind of brake fluid system, comprising: Running brake;Parking brake;The oil inlet and outlet of first accumulator, the first accumulator is connected with running brake;Second stores Energy device, the oil inlet and outlet of the second accumulator are connected with parking brake;First check valve, the import of the first check valve are stored with first The oil inlet and outlet of energy device is connected, and the outlet of the first check valve is connected with the oil inlet and outlet of the second accumulator;Oil pump, oil pump it is fuel-displaced Mouth is connected with the oil inlet and outlet of the first accumulator, and is connected by the first check valve with the oil inlet and outlet of the second accumulator.
In the technical scheme, by brake fluid system be arranged two accumulators, and two accumulators respectively with Running brake is connected with parking brake, thus be conducive to running brake and parking brake by with the storage that is respectively connected Energy device forms relatively independent circuit, reduces the interference between service brake circuit and parking brake loop;Further, pass through The setting of first check valve, so that after the hydraulic oil in the first accumulator flows to the second accumulator, no longer from the second accumulator stream It returns, in this way, the hydraulic oil in the second accumulator is by first when the first accumulator, which breaks down, leads to leakage, pressure decline The blocking of check valve and can not flow back so that the hydraulic fluid pressure of the second accumulator will not be influenced by the first accumulator failure and It reduces, to guarantee the pressure of parking brake, improves the safety and reliability of vehicle driving and braking;Oil pump is set It sets, when being conducive to the hydraulic oil reduction in the first accumulator or the second accumulator declines pressure, is stored by oil pump to first Oily pressurising is sent in energy device and the second accumulator, to guarantee the hydraulic fluid pressure of the first accumulator and the second accumulator, is further mentioned Rise the safety and reliability of vehicle driving.
In the above-mentioned technical solutions, the oil inlet of fuel tank, oil pump is connected with fuel tank;First control valve is set to the first storage Between the oil inlet and outlet and running brake of energy device, the first control valve is used to control the oil inlet and outlet of the first accumulator and driving is made The on-off of on-off and/or running brake and fuel tank between dynamic device;Second control valve is set to the disengaging oil of the second accumulator Mouthful between parking brake, the second control valve at least have there are two types of station, and under the first station, the disengaging of the second accumulator is oily Mouth is connected to by the second control valve with parking brake, and under second station, parking brake passes through the second control valve and fuel tank Connection.
In the technical scheme, the oil inlet of oil pump is connected with fuel tank, convenient for storing hydraulic oil by fuel tank and passing through oil It pumps to two accumulators and send oil, guarantee the pressure in accumulator;Between the oil inlet and outlet and running brake of the first accumulator First control valve is set, the first control valve is used to control the on-off between the oil inlet and outlet and running brake of the first accumulator, Be conducive in this way in service brake, connect the pipeline between the first accumulator and running brake, send oil to running brake Service brake is realized in pressurization, and by the pipeline between the first accumulator of cutting and running brake, is discharged in running brake Hydraulic oil and be depressured, release service brake.
First control valve is also used to control the on-off of running brake and fuel tank.Specifically, running brake also passes through One control valve is connected with fuel tank, in this way, passing through the first control after the pipeline between the first accumulator and running brake is cut off Valve processed connects the pipeline between running brake and fuel tank, and hydraulic oil, which can flow back to fuel tank by the first control valve, reduces driving Pressure in brake realizes the releasing of service brake;And in service brake, the first control valve cuts off running brake and oil Pipeline between case reduces brake force, improves vehicle row to avoid hydraulic oil flows back to fuel tank and hydraulic fluid pressure is caused to decline The convenience and reliability of vehicle control for brake.
Second control valve is set between the oil inlet and outlet and parking brake of the second accumulator, it is possible to understand that ground, the second control Valve processed is also connected with fuel tank, in this way, being conducive to the second control valve under the first station, is connected to the second accumulator and parking brake Between pipeline the pipeline of parking brake and fuel tank is connected to, to realize respectively under two stations and under second station Parking braking releases parking braking, promotes the convenience and reliability of vehicle parking control.
In the above-mentioned technical solutions, brake fluid system further include: driving mechanism is drivingly connected with oil pump;Pressure sensing Device is connected with the oil inlet and outlet of the first accumulator, and pressure sensor is used to obtain the hydraulic oil of the oil inlet and outlet of the first accumulator Pressure;Controller is connected with pressure sensor and driving mechanism, and controller is used in hydraulic fluid pressure less than the first preset value When, start driving mechanism, controller is also used to close driving mechanism when hydraulic fluid pressure is greater than the second preset value, and first is pre- If value is less than the second preset value.
In the technical scheme, by being monitored to hydraulic fluid pressure, start in pressure reduction to the first preset value Driving mechanism is to drive oil pump to carry out sending oily ftercompction to the first accumulator, to keep hydraulic fluid pressure within the scope of certain numerical value, The brake force for advantageously ensuring that system promotes the safety and reliability of vehicle driving.
In the above-mentioned technical solutions, brake fluid system further include: first pressure relay, the disengaging with the first accumulator Hydraulic fluid port is connected;Alarm is connected with first pressure relay;First pressure relay is used to be less than third in hydraulic fluid pressure pre- If when value, issuing the first signal to alarm, alarm being made to issue alarm signal;Or, first pressure relay is used for hydraulic The first signal is issued to controller when oil pressure is less than third preset value, controller issues alarm signal for controlling alarm; Wherein, third preset value is less than the first preset value.
In the technical scheme, hydraulic fluid pressure is further monitored by first pressure relay, is conducive in vehicle Failure leads to oil leak, so that oily ftercompction is sent to can not achieve pressure maintaining, ftercompction is invalid, and pressure is further reduced to third preset value When, system issues alarm signal by alarm, reminds driver to take measures, realizes the duplicate protection to vehicle, effectively Safety accident is prevented, the safety and reliability of vehicle is further improved.
In the above-mentioned technical solutions, brake fluid system further include: second pressure relay, the disengaging with the first accumulator Hydraulic fluid port is connected with controller;Vehicle speed sensor is connected with controller, and vehicle speed sensor is used to feed back speed to controller;Control Device is connected with the second control valve;Second pressure relay is used for when hydraulic fluid pressure is less than four preset values, is sent out to controller Second signal is sent, and when speed is greater than zero, controller is also used to send control signal to the second control valve so that parking braking Device carries out parking braking, wherein the 4th preset value is less than third preset value.
In the technical scheme, second pressure relay further monitors hydraulic fluid pressure, be conducive to pressure into One step is reduced to the 4th preset value, and when speed is greater than zero, controls the second control valve by controller, and then control parking braking Device carries out parking braking, realizes the triple protection to vehicle, effectively prevent safety accident occur, further improve vehicle Safety and reliability.
In the above-mentioned technical solutions, brake fluid system further include: angular transducer is connected with controller, angle sensor Device is used to feed back vehicle inclination angle to controller;Position retaining device is connected with controller, and position retaining device is used for controller feedback gear letter Number;Throttle is connected with controller, and throttle is used to feed back throttle signal to controller;Wherein, vehicle gear is in neutral gear, and throttle When signal, speed are zero, controller is also used to send control signal to the second control valve so that parking brake carries out parking Braking;Or, kept off in vehicle gear in traveling, and throttle signal, speed are zero, when vehicle inclination angle is more than or equal to predetermined angle, Controller is also used to send control signal to the second control valve so that parking brake carries out parking braking;Or, controller and One control valve be connected, parking brake braking after, and speed be greater than zero when, controller be also used to send control signal to first Control valve makes running brake carry out service brake.
In the technical scheme, vehicle gear illustrates that vehicle has stopped going in neutral gear and when throttle signal, speed are zero It sails;Vehicle gear is kept off in traveling, and throttle signal, speed are zero, vehicle inclination angle be more than or equal to predetermined angle (such as 3 °, 4 °, 5 °, 6 ° etc.) when, illustrate that vehicle is located on slope and has stopped travelling, but prevent from slipping by slope by the way that gear is hung over traveling gear, at this In the case of two kinds, parking braking is carried out by the control of controller, the automation control of vehicle driving is easy to implement, promotes vehicle The convenience and comfort of driving;And after parking brake braking and when speed is greater than zero, illustrate that car slipping occurs in vehicle Phenomenon, the running brake of controller control at this time carry out service brake, are conducive to increase brake force, vehicle is avoided further to slide It is dynamic, quadruple protection is provided for vehicle, greatly improves the safety of vehicle.
In any of the above-described technical solution, the first control valve be electric-hydraulic proportion brake valve, electric-hydraulic proportion brake valve into Hydraulic fluid port is connected with the first accumulator, and the oil inlet and outlet of electric-hydraulic proportion brake valve is connected with running brake, electric-hydraulic proportion brake valve Oil return opening be connected with fuel tank, electric-hydraulic proportion brake valve be used to be adjusted according to the current signal size that receives the first accumulator to The hydraulic fluid flow rate of running brake output;Between the second accumulator and parking brake, it is additionally provided with pressure reducing valve and the second list To valve;Second control valve is two-position three way magnetic valve, the first hydraulic fluid port of two-position three way magnetic valve and the disengaging oil of the second accumulator Mouthful it is connected, the second hydraulic fluid port of two-position three way magnetic valve is connect with fuel tank, the third hydraulic fluid port of two-position three way magnetic valve and pressure reducing valve Oil inlet is connected, and the oil outlet of pressure reducing valve is connected with parking brake;Under the first station, the first oil of two-position three way magnetic valve It mouthful is connected with the third hydraulic fluid port of two-position three way magnetic valve, under second station, the second hydraulic fluid port of two-position three way magnetic valve and two The third hydraulic fluid port of three-way magnetic valve is connected;The oil inlet of second one-way valve is connected with parking brake, second one-way valve it is fuel-displaced Mouth is connected with the third hydraulic fluid port of two-position three way magnetic valve.
In the technical scheme, electric-hydraulic proportion brake valve is set by the first control valve, is conducive to be issued according to controller Current signal size adjust the first accumulator and to the hydraulic fluid flow rate that running brake exports accurately adjust brake power, The accuracy manipulated in vehicle travel process is promoted, safety and the convenience of vehicle performance are promoted.
Between the second accumulator and parking brake, the setting of pressure reducing valve, convenient for by the hydraulic oil pressure of the second accumulator It is conveyed to parking brake after power decompression, avoids the excessive damage parking brake of pressure;Second control valve is using two-position three way electricity Magnet valve promotes the convenience of vehicle operating convenient for providing hydraulic pressurization and pressure reducing circuit for parking braking.
In any of the above-described technical solution, the disengaging of the rodless cavity of the brake cylinder of running brake and the first accumulator Hydraulic fluid port is connected, and running brake realizes service brake by hydraulic pressurization;The rodless cavity of the brake cylinder of parking brake is arranged There is spring, the rod chamber of the brake cylinder of parking brake is connect with the oil inlet and outlet of the second accumulator, and parking brake passes through Hydraulic pressurization compressed spring discharges parking braking.
In the technical scheme, the oil inlet and outlet phase of the rodless cavity of the brake cylinder of running brake and the first accumulator Even, after hydraulic oil enters the rodless cavity of running brake, it is capable of the rod chamber of squeezing travelling brake, makes running brake Service brake bar in rod chamber drives brake block braking, i.e., realizes service brake by hydraulic pressurization;In parking brake The rodless cavity of brake cylinder is provided with spring, and the elastic force of spring squeezes the rod chamber of parking brake, drives parking vehicle brake lever Brake block and realize parking braking;And the oil inlet and outlet of the rod chamber of the brake cylinder of parking brake and the second accumulator connects Connect, hydraulic oil enters the brake cylinder of parking brake from the rod chamber of parking brake, compressed spring and make parking vehicle brake lever Towards counter motion, to realize the release of parking braking.
In any of the above-described technical solution, brake fluid system further include: hand pump, the oil outlet of hand pump and parking Brake is connected;The oil inlet of first overflow valve, the first overflow valve is connected with parking brake, and the oil outlet of the first overflow valve connects Connected tank;First hydraulic fluid port of pressure-relief valve, pressure-relief valve is connected with parking brake, and the second hydraulic fluid port of pressure-relief valve connects fuel tank;Shuttle valve, With first, second mouthful and third mouth, first is connected with the oil outlet of pressure reducing valve, second mouthful with the oil outlet phase of hand pump Even, third mouth is connected with parking brake.
In the technical scheme, it by the setting of hand pump, is returned convenient for forming unpowered trailer with fuel tank, parking brake Road provides hydraulic oil by hand pump for parking brake and discharges parking braking when vehicle power failure needs trailer, Avoid due to vehicle trouble or hydraulic deficiency cause parking braking that cannot discharge can not trailer, improve the convenience of vehicle operating Property;First overflow valve is set between fuel tank and parking brake, convenient for limit hand pump convey to parking brake it is hydraulic The maximum pressure of oil, to avoid hypertonia and damage parking brake;The setting of pressure-relief valve is conducive to complete trailer Afterwards, so that the hydraulic oil in parking brake is flowed back to fuel tank by the unlatching of pressure-relief valve and restore parking braking, promote vehicle behaviour The convenience of control.
By the setting of shuttle valve, is conducive to that parking brake loop and unpowered trailer circuit is isolated, parking braking is avoided to return Road and unpowered trailer circuit interfere contradiction and generate failure, in this way, hydraulic oil enters parking brake in driving, and Unpowered trailer circuit will not be flowed to.Equally, when being pressurizeed using hand pump, hydraulic oil flows to parking brake, will not flow To parking brake loop, the interference between circuit is avoided, improves the reliability of vehicle operation.
The technical solution of second aspect of the present invention provides a kind of any one of vehicle, including above-mentioned first aspect technology The brake fluid system of scheme.
In the technical scheme, by using the brake fluid system of any one of above-mentioned first aspect technical solution, To be provided with whole beneficial effects of above-described embodiment, details are not described herein.
Additional aspect and advantage of the invention will become obviously in following description section, or practice through the invention Recognize.
Detailed description of the invention
Fig. 1 is the hydraulic schematic diagram of the brake fluid system of one embodiment of the present of invention;
Fig. 2 is the electrical control logical schematic of the brake fluid system of one embodiment of the present of invention.
Wherein, the corresponding relationship between appended drawing reference and component names of the Fig. 1 into Fig. 2 are as follows:
10 fuel tanks, 12 first accumulators, 14 oil pumps, 16 driving mechanisms, 18 pressure sensors, 20 first pressure relays, 21 controllers, 22 alarms, 24 second pressure relays, 26 vehicle speed sensor, 28 parking brake, 32 position retaining devices, 34 throttles, 36 running brakes, 38 second accumulators, 40 second control valves, 42 pressure reducing valves, 46 first check valves, 48 second one-way valves, 50 First control valve, 52 hand pumps, 54 first overflow valves, 56 pressure-relief valves, 58 shuttle valves, 60 second overflow valves.
Specific embodiment
It is with reference to the accompanying drawing and specific real in order to be more clearly understood that the above objects, features and advantages of the present invention Applying mode, the present invention is further described in detail.It should be noted that in the absence of conflict, the implementation of the application Feature in example and embodiment can be combined with each other.
In the following description, numerous specific details are set forth in order to facilitate a full understanding of the present invention, still, the present invention may be used also To be implemented using other than the one described here other modes, therefore, protection scope of the present invention is not by described below Specific embodiment limitation.
According to some embodiments of the present invention referring to Fig. 1 to Fig. 2 description.
As shown in Figure 1 to Figure 2, the brake fluid system of the one embodiment proposed according to the present invention, comprising: service brake Device 36;Parking brake 28;The oil inlet and outlet of first accumulator 12, the first accumulator 12 is connected with running brake 36;Second The oil inlet and outlet of accumulator 38, the second accumulator 38 is connected with parking brake 28;First check valve 46, the first check valve 46 Import is connected with the oil inlet and outlet of the first accumulator 12, the outlet and the oil inlet and outlet phase of the second accumulator 38 of the first check valve 46 Even;Oil pump 14, the oil outlet of oil pump 14 are connected with the oil inlet and outlet of the first accumulator 12, and pass through the first check valve 46 and second The oil inlet and outlet of accumulator 38 is connected.
In this embodiment, by brake fluid system be arranged two accumulators, and two accumulators respectively with row Vehicle brake 36 and parking brake 28 connect, thus be conducive to running brake 36 and parking brake 28 by with respective phase Accumulator even forms relatively independent circuit, reduces the interference between service brake circuit and parking brake loop;Further Ground, by the setting of the first check valve 46 so that after the hydraulic oil in the first accumulator 12 flows to the second accumulator 38, no longer from Second accumulator 38 flows back to, in this way, when the first accumulator 12, which breaks down, leads to leakage, pressure decline, the second accumulator 38 Interior hydraulic oil by the first check valve 46 blocking and can not flow back so that the hydraulic fluid pressure of the second accumulator 38 will not be by The influence of first accumulator, 12 failure and reduce, to guarantee the pressure of parking brake 28, improve vehicle driving and braking Safety and reliability;The setting of oil pump 14, the hydraulic oil be conducive in the first accumulator 12 or the second accumulator 38 subtract When declining pressure less, oily pressurising is sent into the first accumulator 12 and the second accumulator 38 by oil pump 14, to guarantee that first stores The hydraulic fluid pressure of energy device 12 and the second accumulator 38, further promotes the safety and reliability of vehicle driving.
In the above-described embodiments, the oil inlet of fuel tank 10, oil pump 14 is connected with fuel tank 10;First control valve 50, is set to Between the oil inlet and outlet and running brake 36 of first accumulator 12, the first control valve 50 be used for control the first accumulator 12 into The on-off of on-off and/or running brake 36 and fuel tank 10 between oil outlet and running brake 36;Second control valve 40, if It being placed between the oil inlet and outlet and parking brake 28 of the second accumulator 38, the second control valve 40 at least has there are two types of station, Under first station, the oil inlet and outlet of the second accumulator 38 is connected to by the second control valve 40 with parking brake 28, in the second work Under position, parking brake 28 is connected to by the second control valve 40 with fuel tank 10.
In this embodiment, the oil inlet of oil pump 14 is connected with fuel tank 10, convenient for storing hydraulic oil by fuel tank 10 and leading to It crosses oil pump 14 and send oil to two accumulators, guarantee the pressure in accumulator;It is made in the oil inlet and outlet of the first accumulator 12 and driving First control valve 50 is set between dynamic device 36, and the first control valve 50 is used to control the oil inlet and outlet of the first accumulator 12 and driving is made On-off between dynamic device 36, is conducive in this way in service brake, connects between the first accumulator 12 and running brake 36 Pipeline send oily pressurization to running brake 36, realizes service brake, and pass through the first accumulator 12 of cutting and running brake 36 Between pipeline, discharge running brake 36 in hydraulic oil and be depressured, release service brake.
First control valve 50 is also used to control the on-off of running brake 36 Yu fuel tank 10.Specifically, running brake 36 Also it is connected by the first control valve 50 with fuel tank 10, in this way, the pipeline quilt between the first accumulator 12 and running brake 36 After cutting, the pipeline between running brake 36 and fuel tank 10 is connected by the first control valve 50, hydraulic oil can pass through first Control valve 50 flows back to fuel tank 10 and reduces the pressure in running brake 36, realizes the releasing of service brake;And in service brake When, the first control valve 50 cuts off the pipeline between running brake 36 and fuel tank 10, to avoid hydraulic oil flows back to fuel tank 10 and leads Hydraulic fluid pressure decline is caused, brake force is reduced, improves the convenience and reliability of vehicle driving control for brake.
It is to be appreciated that the first control valve 50 is including any one in two position three-way valve, three-position three-way valve, electro-hydraulic proportional valve Kind.
Second control valve 40 is set between the oil inlet and outlet and parking brake 28 of the second accumulator 38, it is possible to understand that ground, Second control valve 40 is also connected with fuel tank 10, in this way, being conducive to the second control valve 40 under the first station, is connected to the second accumulator Pipeline between 38 and parking brake 28, and under second station, it is connected to the pipeline of parking brake 28 and fuel tank 10, thus It realizes parking braking respectively under two stations or releases parking braking, promote the convenience of vehicle parking control and reliable Property.
It is to be appreciated that the second control valve 40 includes any one in two position three-way valve, three-position three-way valve, meanwhile, it can To be proportioning valve or common reversal valve.
As shown in Fig. 2, in the above-described embodiments, brake fluid system further include: driving mechanism 16 drives with oil pump 14 and connects It connects;Pressure sensor 18 is connected with the oil inlet and outlet of the first accumulator 12, and pressure sensor 18 is for obtaining the first accumulator 12 Oil inlet and outlet hydraulic fluid pressure;Controller 21 is connected with pressure sensor 18 and driving mechanism 16, and controller 21 is used for When hydraulic fluid pressure is less than the first preset value, start driving mechanism 16, controller 21 is also used to be greater than second in hydraulic fluid pressure When preset value, driving mechanism 16 is closed, the first preset value is less than the second preset value.
In this embodiment, by being monitored to hydraulic fluid pressure, in pressure reduction to the first preset value to starting Driving mechanism 16 is to drive oil pump 14 to carry out sending oily ftercompction to the first accumulator 12, to keep hydraulic fluid pressure in certain numerical value model In enclosing, advantageously ensures that the brake force of system, promote the safety and reliability of vehicle driving.
Specifically, driving mechanism 16 are drivingly connected with oil pump 14, convenient for providing the power for sending oily pressurising for oil pump 14, mention Rise the convenience for sending oily efficiency and sending oil;Controller 21 is connected with driving mechanism 16 and pressure sensor 18, pressure sensor 18 It is connected with the first accumulator 12, convenient for being monitored by pressure sensor 18 to hydraulic fluid pressure, it is ensured that hydraulic fluid pressure exists Between first preset value and the second preset value, and when pressure is lower than the first preset value, driving mechanism is started by controller 21 16, driving oil pump 14 send oily pressurising into the first accumulator 12, guarantees the stabilization of pressure, and then guarantees that the brake force of vehicle is steady It is fixed, it avoids generating safety accident;Driving mechanism 16 is closed when pressure is greater than the second preset value and send oil to stop oil pump 14, is avoided Pressure is excessive to be caused to damage the first accumulator 12, improves the reliability and safety of vehicle.
Driving mechanism 16 includes any one in motor, electric motor, can also be internal combustion engine certainly.
In the above-described embodiments, brake fluid system further include: first pressure relay 20, with first accumulator 12 into Oil outlet is connected;Alarm 22 is connected with first pressure relay 20;First pressure relay 20 is used for small in hydraulic fluid pressure When third preset value, the first signal is issued to alarm 22, alarm 22 is made to issue alarm signal;Or, first pressure relay Device 20 is used to issue the first signal to controller 21 when hydraulic fluid pressure is less than third preset value, and controller 21 is for controlling report Alert device 22 issues alarm signal;Wherein, third preset value is less than the first preset value.
In this embodiment, hydraulic fluid pressure is further monitored by first pressure relay 20, is conducive in vehicle Failure leads to oil leak, so that oily ftercompction is sent to can not achieve pressure maintaining, ftercompction is invalid, and pressure is further reduced to third preset value When, system issues alarm signal by alarm 22, reminds driver to take measures, realizes the duplicate protection to vehicle, have Effect prevents safety accident, further improves the safety and reliability of vehicle.
Specifically, oil circuit and components are likely to occur failure or pipeline leaks, and cause oil pump 14 to the first accumulation of energy Oily pressurising is sent to fail in device 12, hydraulic fluid pressure cannot be maintained at the first preset value or more, but further decrease, and pass through setting First pressure relay 20 is also provided with and is connected with first pressure relay 20 to monitor being further change in for hydraulic pressure value Alarm 22, so as to it is hydraulic be further reduced to third preset value or less when, first pressure relay 20 can be to alarm 22 or controller 21 issue the first signal, make alarm 22 issue alarm signal and remind driver that parking maintenance etc. is taken to arrange Apply, prevent it is hydraulic continue reduce cause brake force lose and cause safety accident.
It is to be appreciated that setting first pressure relay 20 come monitor hydraulic fluid pressure whether drop to third preset value with Under, rather than monitored by pressure sensor 18, this is because pressure switch can when pressure reaches predetermined value, first Time acts electric contact, meanwhile, first pressure relay 20 is connected with alarm 22, once in this way, hydraulic fluid pressure is lower than Third preset value can be made alarm 22 issue alarm signal by first pressure relay 20, shorten the stream of signal in this way Path saves the time, improves the efficiency that alarm issues, is conducive to driver and is down to third preset value or less under pressure First time just take measures, avoid the safety accidents such as car slipping, double protection realized to vehicle, further improves vehicle Safety and reliability.
Optionally, alarm 22 includes any one in buzzer siren 22, combined aural and visual alarm 22.
In the above-described embodiments, brake fluid system further include: second pressure relay 24, with first accumulator 12 into Oil outlet is connected with controller 21;Vehicle speed sensor 26 is connected with controller 21, and vehicle speed sensor 26 is used for anti-to controller 21 Present speed;Controller 21 is connected with the second control valve 40;Second pressure relay 24 is used for pre- less than the 4th in hydraulic fluid pressure If sending second signal to controller 21, and when speed is greater than zero, controller 21 is also used to send control signal to the when value Two control valves 40 are so that parking brake 28 carries out parking braking, wherein the 4th preset value is less than third preset value.
In this embodiment, second pressure relay 24 further monitors hydraulic fluid pressure, be conducive to pressure into One step is reduced to the 4th preset value, and when speed is greater than zero, controls the second control valve 40 by controller 21, and then control parking Brake 28 carries out parking braking, realizes the triple protection to vehicle, effectively prevent safety accident occur, is further promoted The safety and reliability of vehicle.
Specifically, by the way that second pressure relay 24 is arranged in brake fluid system, convenient for the first accumulator 12 of monitoring Hydraulic fluid pressure;It is monitored by vehicle speed sensor 26 and feeds back speed to controller 21, convenient for determining whether vehicle is in capable Sail state;It is connected by controller 21 with second pressure relay 24, vehicle speed sensor 26, the second control valve 40, convenient for control Device 21 receives pressure signal and speed signal, and controls the second control valve 40 according to the signal received, thus in pressure reduction Below to the 4th preset value and when speed is greater than zero, urgent parking braking is carried out to vehicle, stops the traveling of vehicle, avoids safety Accident provides triple protection for vehicle.
It should be noted that hydraulic fluid pressure drops to the 4th preset value, illustrate pressure wretched insufficiency, and speed is greater than Zero, at this time since insufficient pressure causes brake power insufficient, uses parking braking rather than service brake, advantageously ensure that Braking effect.
Optionally, parking brake 28 includes any one in parking handle braking device or parking button braking device.
In the above-described embodiments, brake fluid system further include: angular transducer is connected with controller 21, angle sensor Device is used to feed back vehicle inclination angle to controller 21;Position retaining device 32 is connected with controller 21, and position retaining device 32 is used for anti-to controller 21 Present shift signal;Throttle 34 is connected with controller 21, and throttle 34 is used to feed back throttle signal to controller 21;Wherein, vehicle is kept off Position is in neutral gear, and when throttle signal, speed are zero, controller 21 be also used to send control signal to the second control valve 40 so that Parking brake 28 carries out parking braking;Or, being kept off in vehicle gear in traveling, and throttle signal, speed are zero, vehicle inclination angle When more than or equal to predetermined angle, controller 21 be also used to send control signal to the second control valve 40 so that parking brake 28 into Row parking braking;Or, controller 21 is connected with the first control valve 50, after the braking of parking brake 28, and when speed is greater than zero, Controller 21 is also used to send control signal makes running brake 36 carry out service brake to the first control valve 50.
In this embodiment, vehicle gear illustrates that vehicle has stopped going in neutral gear and when throttle signal, speed are zero It sails;Vehicle gear is kept off in traveling, and throttle signal, speed are zero, when vehicle inclination angle is more than or equal to predetermined angle, illustrates vehicle On slope and stop travelling, but prevented from slipping by slope by the way that gear is hung over traveling gear, in both cases, has passed through control The control of device 21 carries out parking braking, is easy to implement the automation control of vehicle driving, promotes the convenience of vehicle drive and relaxes Adaptive, predetermined angular, which can according to need, to be selected, such as 2 °, 3 °, 4 °, 5 °, 6 °, 7 °;And it is braked in parking brake 28 When afterwards and speed is greater than zero, illustrate that the phenomenon that car slipping occurs in vehicle, controller 21 controls running brake 36 and gone at this time Vehicle braking is conducive to increase brake force, vehicle is avoided further to slide, and provides quadruple protection for vehicle, greatly mentions The safety of vehicle is risen.
Specifically, vehicle inclination angle is obtained by angular transducer, convenient for determining whether road surface where vehicle has the gradient;Separately Outside, controller 21 is connected with position retaining device 32 and throttle 34, convenient for determining the driving status of vehicle;Further, vehicle gear exists Neutral gear and when throttle signal, speed signal are zero, illustrates that vehicle has stopped travelling, at this point, sending control by controller 21 Signal processed gives the second control valve 40 so that parking brake 28 carries out parking braking automatically, i.e. progress automatic parking, can be to avoid Vehicle slides and promotes safety, can also avoid neglecting due to driver and forget to carry out parking braking, improve vehicle drive Convenience and safety, when controller 21 be set to vehicle outside when, can also realize vehicle remote control parking, further realize vehicle Remote driving, improve the convenience and comfort that vehicle uses;Alternatively, kept off in vehicle gear in traveling, and throttle signal, Speed signal be zero and vehicle inclination angle be more than or equal to predetermined angle when, illustrate vehicle be located at certain slope road surface on, On this road surface, by keeping off the setting of vehicle gear in traveling, i.e. the method that slips by slope of motor for preventing is beneficial to prevent vehicle and slips Slope avoids safety accident, therefore can carry out parking braking by controller 21 at this time, further avoids car slipping accident, equally, Control by then passing through controller 21 carries out parking braking, and remote control parking and the remote driving of vehicle also may be implemented.
It is to be appreciated that not meeting any of the above-described condition, i.e. vehicle neutral gear, but throttle signal or speed signal are not zero When or vehicle kept off in traveling, but when throttle signal or speed signal are not zero, need to discharge parking braking, to avoid influence The normally travel of vehicle.
Further, after the braking of parking brake 28, vehicle should be at parked state, and speed signal still occurs The case where greater than zero, explanation are parking brake force deficiencies, it is possible to lead to major accident;At this point, sending control by controller 21 Signal processed to the first control valve 50 control running brake 36 carry out service brake, be conducive to increase brake force, avoid vehicle into One step slides, in this way, providing quadruple protection after sending oily pressurising, alarm, urgent parking braking for vehicle, greatly Ground improves the safety of vehicle.
Optionally, running brake 36 includes any one in brake handle, brake machine.
In any of the above-described a embodiment, the first control valve 50 be electric-hydraulic proportion brake valve, electric-hydraulic proportion brake valve into Hydraulic fluid port is connected with the first accumulator 12, and the oil inlet and outlet of electric-hydraulic proportion brake valve is connected with running brake 36, electric-hydraulic proportion system The oil return opening of dynamic valve is connected with fuel tank 10, and electric-hydraulic proportion brake valve, which is used to adjust first according to the current signal size received, to be stored The hydraulic fluid flow rate that energy device 12 is exported to running brake 36;Between the second accumulator 38 and parking brake 28, it is additionally provided with Pressure reducing valve 42 and second one-way valve 48;Second control valve 40 is two-position three way magnetic valve, the first hydraulic fluid port of two-position three way magnetic valve It is connected with the oil inlet and outlet of the second accumulator 38, the second hydraulic fluid port of two-position three way magnetic valve is connect with fuel tank 10, two-position three way electricity The third hydraulic fluid port of magnet valve is connected with the oil inlet of pressure reducing valve 42, and the oil outlet of pressure reducing valve 42 is connected with parking brake 28;? Under one station, the first hydraulic fluid port of two-position three way magnetic valve is connected with the third hydraulic fluid port of two-position three way magnetic valve, under second station, Second hydraulic fluid port of two-position three way magnetic valve is connected with the third hydraulic fluid port of two-position three way magnetic valve;The oil inlet of second one-way valve 48 with Parking brake 28 is connected, and the oil outlet of second one-way valve 48 is connected with the third hydraulic fluid port of two-position three way magnetic valve.
In this embodiment, electric-hydraulic proportion brake valve is set by the first control valve 50, is conducive to be sent out according to controller 21 Current signal size out adjusts the first accumulator 12 and accurately adjusts driving to the hydraulic fluid flow rate that running brake 36 exports Brake force promotes the accuracy manipulated in vehicle travel process, promotes safety and the convenience of vehicle performance.
Further, the oil inlet of electric-hydraulic proportion brake valve is connected with the first accumulator 12, electric-hydraulic proportion brake valve into Oil outlet is connected with running brake 36, convenient for when carrying out service brake, the first accumulator 12 passes through voltage ratio brake valve Hydraulic oil is conveyed to running brake 36, and brake force is provided;The oil return opening of electric-hydraulic proportion brake valve is connected with fuel tank 10, is convenient for When releasing service brake, the hydraulic oil in running brake 36, which flows back to fuel tank 10 by the oil return opening of electric-hydraulic proportion brake valve, to be released Brake power is put, the convenience of vehicle operating is improved.
Between the second accumulator 38 and parking brake 28, the setting of pressure reducing valve 42, convenient for by the second accumulator 38 It is conveyed to parking brake 28 after hydraulic fluid pressure decompression, avoids the excessive damage parking brake 28 of pressure;Second control valve 40 Using two-position three way magnetic valve, convenient for providing hydraulic pressurization and pressure reducing circuit for parking braking, the convenience of vehicle operating is promoted, Specifically, the first hydraulic fluid port of two-position three way magnetic valve is connected with the oil inlet and outlet of the second accumulator 38, two-position three way magnetic valve Second hydraulic fluid port is connect with fuel tank 10, and the third hydraulic fluid port of two-position three way magnetic valve is connected with the oil inlet of pressure reducing valve 42, pressure reducing valve 42 Oil outlet be connected with parking brake 28;In this way, two-position three way magnetic valve obtains electric, two-position three-way electromagnetic under the first station First hydraulic fluid port of valve is connected with the third hydraulic fluid port of two-position three way magnetic valve, enables the hydraulic oil in the second accumulator 38 by two Position-3-way solenoid valve and pressure reducing valve 42 flow into parking brake 28 as the pressurization of parking brake 28;Under second station, two three Three-way electromagnetic valve power-off, the pipeline cutting between the first hydraulic fluid port and third hydraulic fluid port, the second hydraulic fluid port of two-position three way magnetic valve and two The third hydraulic fluid port of three-way magnetic valve is connected;The oil inlet of second one-way valve 48 is connected with parking brake 28, second one-way valve 48 Oil outlet be connected with the third hydraulic fluid port of two-position three way magnetic valve, keep hydraulic oil in parking brake 28 unidirectional through second Valve 48 and two-position three way magnetic valve flow back to fuel tank 10, realize the decompression of parking brake 28, such structure, which is advantageously implemented, stays The automatic control of vehicle braking and release, promotes the convenience and comfort of vehicle drive, further, also helps realization vehicle Remote controlled braking.
In any of the above-described a embodiment, the rodless cavity of the brake cylinder of running brake 36 and the first accumulator 12 into Oil outlet is connected, and running brake 36 realizes service brake by hydraulic pressurization;The brake cylinder of parking brake 28 without bar Chamber is provided with spring, and the rod chamber of the brake cylinder of parking brake 28 is connect with the oil inlet and outlet of the second accumulator 38, parking Brake 28 discharges parking braking by hydraulic pressurization compressed spring.
In this embodiment, the oil inlet and outlet phase of the rodless cavity of the brake cylinder of running brake 36 and the first accumulator 12 Even, after hydraulic oil enters the rodless cavity of running brake, it is capable of the rod chamber of squeezing travelling brake, makes running brake Service brake bar in rod chamber drives brake block braking, i.e., realizes service brake by hydraulic pressurization;In parking brake 28 The rodless cavity of brake cylinder be provided with spring, the elastic force of spring squeezes the rod chamber of parking brake, makes parking vehicle brake lever band It moves brake block and realizes parking braking;And the disengaging oil of the rod chamber of the brake cylinder of parking brake 28 and the second accumulator 38 Mouthful connection, hydraulic oil enters the brake cylinder of parking brake 28 from the rod chamber of parking brake, compressed spring and make parking Brake bar is towards counter motion, to realize the release of parking braking.
Specifically, when driving, controller 21 sends power control signal to two-position three way magnetic valve, makes two-position three-way electromagnetic Valve obtains electric and enters the first station, and the hydraulic oil in the second accumulator 38 flows into parking brake 28, is compressed by hydraulic pressurization Spring and discharge parking braking;When parking braking, controller 21 sends power down control signal to two-position three way magnetic valve, makes two Three-way magnetic valve power-off and enter second station, the hydraulic oil in parking brake 28 flows back to fuel tank 10, release spring and realize Parking braking.
Such structure, so that the compression aspect of service brake and parking braking is on the contrary, when driving a vehicle, hydraulic pressurization makes to drive a vehicle The pressure of brake 36 discharges, and keeps pressure because of the effect of the first check valve 46 in parking brake 28, and then keeps parking The release of braking, to not interfere with the normally travel of vehicle;When service brake, hydraulic fluid pressure increases, the second accumulator Even if 38 pressure increases therewith, the compressed degree of spring is increased, parking braking will not occur and influence the normal row of vehicle It sails;It,, will not shadow even if hydraulic fluid pressure declines since parking braking is braked by the elastic force of spring when long-time parking It rings and arrives parking brake force, improve the stability and reliability of parking braking, and then improve the safety of vehicle.
In any of the above-described a embodiment, brake fluid system further include: hand pump 52, the oil outlet of hand pump 52 with stay Vehicle brake 28 is connected;The oil inlet of first overflow valve 54, the first overflow valve 54 is connected with parking brake 28, the first overflow valve 54 oil outlet connects fuel tank 10;First hydraulic fluid port of pressure-relief valve 56, pressure-relief valve 56 is connected with parking brake 28, pressure-relief valve 56 Second hydraulic fluid port connects fuel tank 10;Shuttle valve 58 has first, second mouthful and third mouth, the oil outlet of first and pressure reducing valve 42 It is connected, second mouthful is connected with the oil outlet of hand pump 52, and third mouth is connected with parking brake 28.
In this embodiment, by the setting of hand pump 52, convenient for forming unpowered drag with fuel tank 10, parking brake 28 Vehicle circuit provides hydraulic oil by hand pump 52 for parking brake 28 and discharges when vehicle power failure needs trailer Parking braking, avoid due to vehicle trouble or hydraulic deficiency cause parking braking that cannot discharge can not trailer, improve vehicle behaviour The convenience of work;First overflow valve 54 is set between fuel tank 10 and parking brake 28, convenient for limiting hand pump 52 to parking The maximum pressure for the hydraulic oil that brake 28 conveys, to avoid hypertonia and damage parking brake 28;Pressure-relief valve 56 Setting, is conducive to after completing trailer, so that the hydraulic oil in parking brake 28 is flowed back to fuel tank by the unlatching of pressure-relief valve 56 10 and restore parking braking, promote the convenience of vehicle performance.
It is to be appreciated that the second overflow valve 60, the second overflow valve can be set between the first accumulator 12 and fuel tank 10 60 is in parallel with oil pump 14, and the hydraulic oil for avoiding oil pump 14 from being sent in the first accumulator 12 excessively causes pressure too big and damages first Accumulator 12.
By the setting of shuttle valve 58, is conducive to that parking brake loop and unpowered trailer circuit is isolated, avoids parking braking Circuit and unpowered trailer circuit interfere contradiction and generate failure, in this way, hydraulic oil enters parking brake in driving 28, without flowing to unpowered trailer circuit.Equally, when being pressurizeed using hand pump 52, hydraulic oil flows to parking brake 28, It will not be flow to parking brake loop, avoid the interference between circuit, improve the reliability of vehicle operation.
The embodiment of second aspect of the present invention provides a kind of vehicle, including any one embodiment in above-mentioned first aspect Brake fluid system.
In this embodiment, by using the brake fluid system of any of the above-described a embodiment, to be provided with above-mentioned reality Whole beneficial effects of example are applied, details are not described herein.
Optionally, vehicle provided in this embodiment, including but not limited to general-utility car, lorry, engineering truck, special vehicle In any one.
The technical scheme of the present invention has been explained in detail above with reference to the attached drawings, according to the technical solution of the present invention, using two Accumulator is connect with running brake and parking brake respectively, forms service brake and parking braking two relatively independent times The interference between service brake circuit and parking brake loop is reduced on road, improve vehicle driving and braking safety and can By property;It is also provided for vehicle and send oily pressure maintaining, alarm, urgent parking braking, the quadruple protection of service brake auxiliary, be substantially improved The safety and reliability of vehicle.
In the present invention, term " first ", " second ", " third " are only used for the purpose of description, and should not be understood as indicating Or imply relative importance;Term " multiple " then refers to two or more, unless otherwise restricted clearly.Term " installation ", The terms such as " connected ", " connection ", " fixation " shall be understood in a broad sense, for example, " connection " may be a fixed connection, being also possible to can Dismantling connection, or be integrally connected;" connected " can be directly connected, can also be indirectly connected through an intermediary.For this For the those of ordinary skill in field, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
In description of the invention, it is to be understood that the instructions such as term " on ", "lower", "left", "right", "front", "rear" Orientation or positional relationship is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of the description present invention and simplification is retouched It states, rather than the device or unit of indication or suggestion meaning must have specific direction, be constructed and operated in a specific orientation, It is thus impossible to be interpreted as limitation of the present invention.
In the description of this specification, the description of term " one embodiment ", " some embodiments ", " specific embodiment " etc. Mean that particular features, structures, materials, or characteristics described in conjunction with this embodiment or example are contained at least one reality of the invention It applies in example or example.In the present specification, schematic expression of the above terms are not necessarily referring to identical embodiment or reality Example.Moreover, description particular features, structures, materials, or characteristics can in any one or more of the embodiments or examples with Suitable mode combines.
These are only the preferred embodiment of the present invention, is not intended to restrict the invention, for those skilled in the art For member, the invention may be variously modified and varied.All within the spirits and principles of the present invention, it is made it is any modification, Equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.

Claims (10)

1. a kind of brake fluid system characterized by comprising
Running brake (36);
Parking brake (28);
The oil inlet and outlet of first accumulator (12), first accumulator (12) is connected with the running brake (36);
The oil inlet and outlet of second accumulator (38), second accumulator (38) is connected with the parking brake (28);
First check valve (46), the oil inlet and outlet phase of the import of first check valve (46) and first accumulator (12) Even, the outlet of first check valve (46) is connected with the oil inlet and outlet of second accumulator (38);
Oil pump (14), the oil outlet of the oil pump (14) is connected with the oil inlet and outlet of first accumulator (12), and passes through institute The first check valve (46) is stated to be connected with the oil inlet and outlet of second accumulator (38).
2. brake fluid system according to claim 1, which is characterized in that
The oil inlet of fuel tank (10), the oil pump (14) is connected with the fuel tank (10);
First control valve (50), be set to first accumulator (12) oil inlet and outlet and the running brake (36) it Between, first control valve (50) is used to control oil inlet and outlet and the running brake (36) of first accumulator (12) Between on-off and/or the running brake (36) and the fuel tank (10) on-off;
Second control valve (40), be set to second accumulator (38) oil inlet and outlet and the parking brake (28) it Between, second control valve (40) at least has there are two types of station, under the first station, the disengaging oil of second accumulator (38) Mouth is connected to by second control valve (40) with the parking brake (28), under second station, the parking brake (28) it is connected to by second control valve (40) with the fuel tank (10).
3. brake fluid system according to claim 2, which is characterized in that further include:
Driving mechanism (16) is drivingly connected with the oil pump (14);
Pressure sensor (18) is connected with the oil inlet and outlet of first accumulator (12), and the pressure sensor (18) is used for Obtain the hydraulic fluid pressure of the oil inlet and outlet of first accumulator (12);
Controller (21) is connected with the pressure sensor (18) and the driving mechanism (16), and the controller (21) is used for When the hydraulic fluid pressure is less than the first preset value, start the driving mechanism (16), the controller (21) is also used to It when the hydraulic fluid pressure is greater than the second preset value, closes the driving mechanism (16), first preset value is less than described the Two preset values.
4. brake fluid system according to claim 3, which is characterized in that further include:
First pressure relay (20) is connected with the oil inlet and outlet of first accumulator (12);
Alarm (22) is connected with the first pressure relay (20);
The first pressure relay (20) is used for when the hydraulic fluid pressure is less than third preset value, to the alarm (22) the first signal is issued, the alarm (22) is made to issue alarm signal;Or, the first pressure relay (20) is used for The first signal is issued to the controller (21) when the hydraulic fluid pressure is less than third preset value, the controller (21) is used for It controls the alarm (22) and issues alarm signal;
Wherein, the third preset value is less than first preset value.
5. brake fluid system according to claim 4, which is characterized in that further include:
Second pressure relay (24) is connected with the oil inlet and outlet of first accumulator (12) and the controller (21);
Vehicle speed sensor (26) is connected with the controller (21), and the vehicle speed sensor (26) is used for the controller (21) speed is fed back;
The controller (21) is connected with second control valve (40);
The second pressure relay (24) is used for when the hydraulic fluid pressure is less than four preset values, to the controller (21) second signal is sent, and when the speed is greater than zero, the controller (21) is also used to send control signal to described Second control valve (40) so that the parking brake (28) carry out parking braking,
Wherein, the 4th preset value is less than the third preset value.
6. brake fluid system according to claim 5, which is characterized in that further include:
Angular transducer is connected with the controller (21), and the angular transducer is used to feed back to the controller (21) whole Vehicle inclination angle;
Position retaining device (32) is connected with the controller (21), and the position retaining device (32) is used to feed back to the controller (21) and keep off Position signal;
Throttle (34) is connected with the controller (21), and the throttle (34) is used for the controller (21) feedback throttle letter Number;
Wherein, the vehicle gear is in neutral gear, and when the throttle signal, the speed are zero, the controller (21) is also For sending control signal to second control valve (40) so that the parking brake (28) carries out parking braking;Or,
It is kept off in the vehicle gear in traveling, and the throttle signal, the speed are zero, the vehicle inclination angle is more than or equal to When predetermined angle, the controller (21) is also used to send control signal to second control valve (40) so that the parking system Dynamic device (28) carry out parking braking;Or,
The controller (21) is connected with first control valve (50), after the parking brake (28) braking, and it is described When speed is greater than zero, the controller (21), which is also used to send control signal, makes the driving to first control valve (50) Dynamic device (36) carry out service brake.
7. the brake fluid system according to any one of claim 2-6, which is characterized in that
First control valve (50) is electric-hydraulic proportion brake valve, and the oil inlet of the electric-hydraulic proportion brake valve and described first store Energy device (12) is connected, and the oil inlet and outlet of the electric-hydraulic proportion brake valve is connected with the running brake (36), the electro-hydraulic ratio The oil return opening of example brake valve is connected with the fuel tank (10), and the electric-hydraulic proportion brake valve is used for according to the current signal received The hydraulic fluid flow rate that first accumulator (12) described in big minor adjustment is exported to the running brake (36);
Between second accumulator (38) and the parking brake (28), it is additionally provided with pressure reducing valve (42) and second one-way valve (48);
Second control valve (40) is two-position three way magnetic valve, the first hydraulic fluid port of the two-position three way magnetic valve and described second The oil inlet and outlet of accumulator (38) is connected, and the second hydraulic fluid port of the two-position three way magnetic valve is connect with the fuel tank (10), described The third hydraulic fluid port of two-position three way magnetic valve is connected with the oil inlet of the pressure reducing valve (42), the oil outlet of the pressure reducing valve (42) with The parking brake (28) is connected;Under first station, the first hydraulic fluid port of the two-position three way magnetic valve and described two The third hydraulic fluid port of position-3-way solenoid valve is connected, under second station, the second hydraulic fluid port of the two-position three way magnetic valve and described two The third hydraulic fluid port of position-3-way solenoid valve is connected;
The oil inlet of the second one-way valve (48) is connected with the parking brake (28), and the second one-way valve (48) goes out Hydraulic fluid port is connected with the third hydraulic fluid port of the two-position three way magnetic valve.
8. brake fluid system according to claim 1-6, which is characterized in that
The rodless cavity of the brake cylinder of the running brake (36) is connected with the oil inlet and outlet of first accumulator (12), institute It states running brake (36) and service brake is realized by hydraulic pressurization;
The rodless cavity of the brake cylinder of the parking brake (28) is provided with spring, the brake oil of the parking brake (28) The rod chamber of cylinder is connect with the oil inlet and outlet of second accumulator (38), and the parking brake (28) passes through hydraulic pressurization pressure Contract the spring, discharges parking braking.
9. brake fluid system according to claim 1 to 6, which is characterized in that further include:
The oil outlet of hand pump (52), the hand pump (52) is connected with the parking brake (28);
The oil inlet of first overflow valve (54), first overflow valve (54) is connected with the parking brake (28), and described The oil outlet of one overflow valve (54) connects fuel tank (10);
First hydraulic fluid port of pressure-relief valve (56), the pressure-relief valve (56) is connected with the parking brake (28), the pressure-relief valve (56) the second hydraulic fluid port connects the fuel tank (10);
Shuttle valve (58) has first, second mouthful and third mouth, and the first is connected with the oil outlet of pressure reducing valve (42), institute It states second mouthful to be connected with the oil outlet of the hand pump (52), the third mouth is connected with the parking brake (28).
10. a kind of vehicle, which is characterized in that
Including brake fluid system of any of claims 1-9.
CN201811126558.9A 2018-09-26 2018-09-26 Brake fluid system and vehicle Pending CN109249918A (en)

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CN102602385A (en) * 2012-03-27 2012-07-25 三一集团有限公司 Parking braking system and engineering machinery
CN103359097A (en) * 2013-07-18 2013-10-23 杭叉集团股份有限公司 Hydraulic braking system of large-tonnage electric fork-lift truck
CN203372217U (en) * 2013-07-18 2014-01-01 杭叉集团股份有限公司 Large-tonnage electric forklift hydraulic braking system
CN107264499A (en) * 2017-06-30 2017-10-20 徐州徐工矿山机械有限公司 A kind of quarry tipper hydraulic auxiliary brake system and its control method
CN208978826U (en) * 2018-09-26 2019-06-14 三一汽车制造有限公司 Brake fluid system and vehicle

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CN109809332A (en) * 2019-02-12 2019-05-28 安徽合力股份有限公司 A kind of brake system of forklift
CN109809332B (en) * 2019-02-12 2023-09-15 安徽合力股份有限公司 Fork truck braking system
CN109707673A (en) * 2019-02-26 2019-05-03 江苏力源液压机械有限公司 A kind of manual/auto integrated two-way rotary shaft hydraulic braking system
CN110056587A (en) * 2019-04-08 2019-07-26 浙江大学 A kind of dual fail-safe fast braking hydraulic circuit based on marine tidal-current energy generator group
CN110001611A (en) * 2019-04-12 2019-07-12 徐州徐工筑路机械有限公司 A kind of electrohydraulic control system, method and the land leveller of parking braking and releasing
CN110239503A (en) * 2019-06-28 2019-09-17 三一海洋重工有限公司 Brake control alarm method and brake control system
CN111824259A (en) * 2020-07-30 2020-10-27 三一汽车起重机械有限公司 Axle centering control system and crane
CN111994053B (en) * 2020-08-27 2021-12-17 东风商用车有限公司 Active parking braking method
CN111994053A (en) * 2020-08-27 2020-11-27 东风商用车有限公司 Active parking braking method
CN112092793A (en) * 2020-09-30 2020-12-18 福建龙马环卫装备股份有限公司 Hydraulic braking system and braking method capable of achieving drive-by-wire and manual driving simultaneously
CN112498315A (en) * 2020-11-28 2021-03-16 哈尔滨北方防务装备股份有限公司 Air-break brake system of double-section tracked vehicle
CN112622640B (en) * 2021-01-05 2023-03-21 潍柴动力股份有限公司 Ramp parking method and vehicle
CN112622640A (en) * 2021-01-05 2021-04-09 潍柴动力股份有限公司 Ramp parking method and vehicle
CN113944710A (en) * 2021-11-02 2022-01-18 湖北三江航天万山特种车辆有限公司 Parking brake system and vehicle
CN114056297A (en) * 2022-01-12 2022-02-18 中车戚墅堰机车车辆工艺研究所有限公司 Hydraulic braking device for vehicle and control system thereof
CN114056297B (en) * 2022-01-12 2022-04-12 中车戚墅堰机车车辆工艺研究所有限公司 Hydraulic brake control system for vehicle
CN115123166A (en) * 2022-06-06 2022-09-30 徐州徐工特种工程机械有限公司 Hydraulic braking system and control method
CN114852025A (en) * 2022-06-21 2022-08-05 山推工程机械股份有限公司 Auxiliary braking control system for pure electric loader
CN115257672A (en) * 2022-08-29 2022-11-01 广西柳工机械股份有限公司 Braking system and engineering machinery
CN115626149A (en) * 2022-12-20 2023-01-20 北京少仕科技有限公司 Hydraulic braking system for vehicle and control method
CN117841934B (en) * 2023-12-28 2024-06-07 北京少仕科技有限公司 Unmanned vehicle hydraulic braking system and working method thereof

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