CN113911085B - Hydraulic brake system and method of brake - Google Patents

Hydraulic brake system and method of brake Download PDF

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Publication number
CN113911085B
CN113911085B CN202111289980.8A CN202111289980A CN113911085B CN 113911085 B CN113911085 B CN 113911085B CN 202111289980 A CN202111289980 A CN 202111289980A CN 113911085 B CN113911085 B CN 113911085B
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China
Prior art keywords
brake
pressure
oil
regulating valve
outlet
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CN202111289980.8A
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Chinese (zh)
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CN113911085A (en
Inventor
刘德宁
祁宏
赵远
王丽威
王治伟
肖洪彬
薛喆
张娜
韦建龙
贾秀华
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Taiyuan Institute of China Coal Technology and Engineering Group
Shanxi Tiandi Coal Mining Machinery Co Ltd
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Taiyuan Institute of China Coal Technology and Engineering Group
Shanxi Tiandi Coal Mining Machinery Co Ltd
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Application filed by Taiyuan Institute of China Coal Technology and Engineering Group, Shanxi Tiandi Coal Mining Machinery Co Ltd filed Critical Taiyuan Institute of China Coal Technology and Engineering Group
Priority to CN202111289980.8A priority Critical patent/CN113911085B/en
Publication of CN113911085A publication Critical patent/CN113911085A/en
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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
    • B60T13/12—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 the fluid being liquid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L7/00—Electrodynamic brake systems for vehicles in general
    • B60L7/10—Dynamic electric regenerative braking
    • B60L7/18—Controlling the braking effect
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L7/00—Electrodynamic brake systems for vehicles in general
    • B60L7/24—Electrodynamic brake systems for vehicles in general with additional mechanical or electromagnetic braking
    • B60L7/26—Controlling the braking effect
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/16—Information or communication technologies improving the operation of electric vehicles

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Braking Systems And Boosters (AREA)

Abstract

The invention discloses a hydraulic brake system of a brake, which relates to the field of hydraulic systems of brakes and comprises a brake pedal, a pressure regulating valve and a pressure sensor, wherein the brake pedal is connected with the pressure regulating valve, the motion of the brake pedal is used for regulating the oil pressure at the outlet of the pressure regulating valve, the inlet of the pressure regulating valve is used for introducing high-pressure oil, the pressure sensor is used for measuring the oil pressure at the outlet of the pressure regulating valve, the pressure sensor is used for being electrically connected with an electric feedback brake device, the electric feedback brake device can regulate the braking force of the electric feedback brake device according to the oil pressure detected by the pressure sensor, the outlet of the pressure regulating valve is used for being communicated with a piston cylinder of the brake, and the oil pressure flowing into a piston cylinder of the brake from the outlet of the pressure regulating valve is used for regulating the braking force of the brake. The hydraulic brake system of the brake can realize the electro-hydraulic combined braking of the vehicle and improve the safety of the vehicle.

Description

Hydraulic brake system and method of brake
Technical Field
The invention relates to the field of brake hydraulic systems, in particular to a brake hydraulic braking system and a brake hydraulic braking method.
Background
Due to special explosion-proof requirements of underground coal mines and the operation condition of multiple mud and multiple water in underground roadways, most mining vehicles adopt a closed wet brake, meanwhile, the whole vehicle needs to be provided with a full hydraulic brake system, and a brake pedal valve can realize continuous change of brake pressure according to the action of a brake pedal, so that the magnitude of brake force is controlled. Because the slope of the mine roadway is larger than that of the road surface, the travel is long, when the vehicle is heavily loaded and descends, the brake needs to be frequently braked, the brake is seriously abraded, the service life of the brake is short, the cost for replacing the brake is high, and the vehicle has great potential safety hazard.
Disclosure of Invention
The invention aims to provide a hydraulic brake system and a hydraulic brake method of a brake, which are used for solving the problems in the prior art, realizing the electro-hydraulic combined braking of a vehicle and improving the safety of the vehicle.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a hydraulic brake system of a brake, which comprises a brake pedal, a pressure regulating valve and a pressure sensor, wherein the brake pedal is connected with the pressure regulating valve, the motion of the brake pedal is used for regulating the oil pressure at the outlet of the pressure regulating valve, the inlet of the pressure regulating valve is used for introducing high-pressure oil, the pressure sensor is used for measuring the oil pressure at the outlet of the pressure regulating valve, the pressure sensor is used for being electrically connected with an electric feedback brake device, the electric feedback brake device can regulate the braking force of the electric feedback brake device according to the oil pressure detected by the pressure sensor, the outlet of the pressure regulating valve is used for being communicated with a piston cylinder of the brake, and the oil pressure flowing into the piston cylinder of the brake from the outlet of the pressure regulating valve is used for regulating the braking force of the brake.
Preferably, the brake is a safety brake.
Preferably, the pressure regulating valve is a pressure regulating valve, a piston rod is arranged in the piston cylinder, the piston cylinder comprises a rod cavity and a rodless cavity, a spring for pushing the piston rod to extend out of the piston cylinder is arranged in the rodless cavity, and the rod cavity of the piston cylinder is communicated with an outlet of the pressure regulating valve; when the oil pressure detected by the pressure sensor is smaller than the maximum oil pressure at the outlet of the pressure regulating valve, the electric feedback brake device is triggered to start braking, and when the oil pressure in the rod cavity is smaller than the elastic force of the spring, the brake is triggered to start braking; the oil pressure at the outlet of the pressure regulating valve is in negative correlation with the downward stroke of the control pedal, the braking force of the electric feedback braking device is in negative correlation with the oil pressure at the outlet of the pressure regulating valve, and the braking force of the brake is in negative correlation with the oil pressure at the outlet of the pressure regulating valve.
Preferably, the oil-saving device further comprises an explosion-proof electromagnetic valve, an oil inlet of the explosion-proof electromagnetic valve is used for introducing high-pressure oil, and an oil outlet of the explosion-proof electromagnetic valve is used for being communicated with an oil inlet of the pressure regulating valve.
Preferably, an oil return port of the explosion-proof electromagnetic valve and an oil return port of the pressure regulating valve are both communicated with an oil tank.
Preferably, the brake is a non-safety brake.
Preferably, the pressure regulating valve is a pressure regulating valve, a piston rod is arranged in the piston cylinder, the piston cylinder comprises a rod cavity and a rodless cavity, the rod cavity is internally provided with a spring for pushing the piston rod to contract into the piston cylinder, the rodless cavity is communicated with an outlet of the pressure regulating valve, when the oil pressure detected by the pressure sensor is greater than the oil pressure, the electric feedback brake device is triggered to start braking, when the oil pressure in the rodless cavity is greater than the elastic force of the spring, the safety wet brake is triggered to start braking, the oil pressure at the outlet of the pressure regulating valve is positively correlated with the descending stroke of the control pedal, the braking force of the electric feedback brake device is positively correlated with the oil pressure at the outlet of the pressure regulating valve, and the braking force of the brake is positively correlated with the oil pressure at the outlet of the pressure regulating valve.
Preferably, the hydraulic brake further comprises a one-way sequence valve, an oil inlet of the one-way sequence valve is communicated with an oil outlet of the pressure regulating valve, an oil outlet of the one-way sequence valve is communicated with the rodless cavity, and oil enters the rodless cavity to trigger the non-safety brake to start braking.
The invention also provides a brake hydraulic braking method based on any one of the brake hydraulic braking systems, which comprises the following steps: the method is characterized in that: the method comprises the following steps: the brake pedal is stepped on, and the brake pedal starts to regulate the oil outlet pressure of the pressure regulating valve; the pressure sensor detects the change of the oil outlet pressure of the pressure regulating valve, a detection signal is transmitted to the electric feedback brake device to start braking, and the braking force of the electric feedback brake device changes according to the change of the oil outlet pressure of the pressure regulating valve detected by the pressure sensor; the oil outlet pressure of the pressure regulating valve simultaneously controls a piston cylinder of the brake so as to control the braking force of the brake.
Preferably, when the brake is a safety brake, the brake pedal is stepped, the pressure of the oil outlet of the pressure regulating valve is regulated by the brake pedal to be gradually reduced along with the descending of the brake pedal, and the electric feedback brake device gradually increases the braking force; the oil hydraulic pressure in a piston cylinder of the brake is gradually reduced, so that the braking force of the brake is gradually increased; when the brake pedal is released, the pressure of the oil outlet of the pressure regulating valve is gradually increased when the brake pedal moves upwards, and the braking force of the electric feedback brake device and the brake is gradually reduced;
when the brake is a non-safety brake, the brake pedal is stepped down, the pressure of the oil outlet of the pressure regulating valve is regulated by the brake pedal to gradually increase along with the descending of the brake pedal, the electric feedback brake device gradually increases the braking force, and the oil hydraulic pressure in a piston cylinder of the brake is gradually increased to gradually increase the braking force of the brake; and when the brake pedal is released, the pressure of the oil outlet of the pressure regulating valve is gradually reduced when the brake pedal moves upwards, and the braking force of the electric feedback braking device and the brake is gradually reduced.
Compared with the prior art, the invention has the following technical effects:
according to the hydraulic brake system of the brake, the brake pedal is stepped, the pressure sensor detects that the oil pressure at the outlet of the pressure regulating valve changes, the electric feedback brake device receives a signal transmitted by the pressure sensor to trigger the electric feedback brake device to start braking, the outlet of the pressure regulating valve is communicated with the piston cylinder of the brake, and when the oil pressure at the outlet of the pressure regulating valve changes, the brake can regulate the braking force of the brake according to the oil pressure in the piston cylinder, so that the combined braking of the electric feedback brake device and the brake is realized, the working strength of the brake is reduced, the stability of the brake is improved, and the safety of a vehicle is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required in the embodiments will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural view of a safety type brake hydraulic braking system of the brake hydraulic braking system provided in the present invention;
fig. 2 is a schematic structural diagram of a non-safety type brake hydraulic braking system of the brake hydraulic braking system provided in the present invention.
In the figure: 1-explosion-proof electromagnetic valve; 2-a pressure regulating valve; 3-a brake pedal; 4-a pressure sensor; 5, a piston cylinder; 6-rodless cavity; 7-a rod cavity; 8-a piston rod; 9-a spring; 10-a fuel tank; 11-single-phase sequence valve.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a hydraulic brake system of a brake, which aims to solve the problems in the prior art, realize the electro-hydraulic combined braking of a vehicle and improve the safety of the vehicle.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Example one
The embodiment provides a hydraulic brake system of a brake, which comprises a brake pedal 3, a pressure regulating valve 2 and a pressure sensor 4, wherein the brake pedal 3 is connected with the pressure regulating valve 2, the motion of the brake pedal 3 is used for regulating the oil pressure at the outlet of the pressure regulating valve 2, the inlet of the pressure regulating valve 2 is used for introducing high-pressure oil, the pressure sensor 4 is used for measuring the oil pressure at the outlet of the pressure regulating valve 2, the pressure sensor 4 is used for being electrically connected with an electric feedback brake device, the electric feedback brake device can regulate the braking force of the electric feedback brake device according to the oil pressure detected by the pressure sensor 4, the outlet of the pressure regulating valve 2 is used for being communicated with a piston cylinder 5 of the brake, and the oil pressure flowing into the piston cylinder 5 of the brake from the outlet of the pressure regulating valve 2 is used for regulating the braking force of the brake. The brake pedal 3 is stepped on, the pressure sensor 4 detects that the oil pressure at the outlet of the pressure regulating valve 2 changes, the electric feedback brake device receives a signal transmitted by the pressure sensor 4 to trigger the electric feedback brake device to start braking, the outlet of the pressure regulating valve 2 is communicated with the piston cylinder 5 of the brake, and when the oil pressure at the outlet of the pressure regulating valve 2 changes, the brake can regulate the braking force of the brake according to the oil pressure in the piston cylinder 5, so that the combined braking of the electric feedback brake device and the brake is realized, the working strength of the brake is reduced, the stability of the brake is improved, and the safety of a vehicle is improved.
Example two
The present embodiment provides a hydraulic brake system, and as shown in fig. 1, the brake of the hydraulic brake system provided in the present embodiment is a safety brake. The safety brake is in a working mode of spring driving brake fluid driving pressure release.
In the embodiment, the larger the descending distance of the brake pedal 3 of the pressure regulating valve 2 is, the smaller the oil pressure at the outlet of the pressure regulating valve 2 is, the piston rod 8 is arranged in the piston cylinder 5, the piston cylinder 5 comprises a rod cavity 7 and a rodless cavity 6, the spring 9 for pushing the piston rod 8 to extend out of the piston cylinder 5 is arranged in the rodless cavity 6, and the rod cavity 7 of the piston cylinder 5 is communicated with the outlet of the pressure regulating valve 2; when the oil pressure detected by the pressure sensor 4 is smaller than the maximum oil pressure at the outlet of the pressure regulating valve 2, the electric feedback brake device is triggered to start braking, and when the oil pressure in the rod cavity 7 is smaller than the elastic force of the spring 9, the brake is triggered to start braking; the oil pressure at the outlet of the pressure regulating valve 2 is in negative correlation with the downward stroke of the control pedal, the braking force of the electric feedback brake device is in negative correlation with the oil pressure at the outlet of the pressure regulating valve 2, and the braking force of the brake is in negative correlation with the oil pressure at the outlet of the pressure regulating valve 2. The brake pedal 3 is stepped on, the oil pressure at the outlet of the pressure regulating valve 2 is gradually reduced, when the pressure sensor 4 detects that the oil pressure is smaller than the maximum pressure at the outlet of the pressure regulating valve 2, the electric feedback brake device starts to brake, the larger the descending stroke of the brake pedal 3 is, the smaller the oil pressure at the outlet of the pressure regulating valve 2 is, and the larger the braking force of the electric feedback brake device is. When the downward stroke of the brake pedal 3 is larger and larger, the oil pressure at the outlet of the pressure regulating valve 2 is reduced to be smaller than the elastic force of the spring 9, the elastic force of the spring 9 pushes the piston rod 8 to extend out of the piston cylinder 5, the smaller the oil pressure at the outlet of the pressure regulating valve 2 is, the larger the stroke of the piston rod 8 extending out of the piston cylinder 5 is, and the larger the braking force of the brake is. Therefore, the electro-hydraulic combined braking of the vehicle is realized, and the safety of the vehicle is improved.
In this embodiment, still include explosion-proof solenoid valve 1, the oil inlet of explosion-proof solenoid valve 1 is used for letting in high-pressure oil, and the oil-out of explosion-proof solenoid valve 1 is used for communicating with the oil inlet of pressure regulating valve 2. The explosion-proof electromagnetic valve 1 can improve the safety of the hydraulic system.
In this embodiment, the oil return port of the explosion-proof solenoid valve 1 and the oil return port of the pressure regulating valve 2 are both communicated with the oil tank 10. The excess oil is returned to the tank 10.
EXAMPLE III
The present embodiment provides a hydraulic brake system, as shown in fig. 2, and is different from the second embodiment in that the brake of the hydraulic brake system provided in the present embodiment is a non-safety brake. The non-safety brake is in a working mode of hydraulic drive brake spring drive release.
In this embodiment, the larger the descending distance of the brake pedal 3 of the pressure regulating valve 2 is, the larger the oil pressure at the outlet of the pressure regulating valve 2 is, the piston rod 8 is arranged in the piston cylinder 5, the piston cylinder 5 comprises a rod cavity 7 and a rodless cavity 6, a spring 9 for pushing the piston rod 8 to contract into the piston cylinder 5 is arranged in the rod cavity 7, the rodless cavity 6 is communicated with the outlet of the pressure regulating valve 2, when the oil pressure at the oil pressure detected by the pressure sensor 4 is greater than the oil pressure, the electric feedback brake device is triggered to start braking, when the oil pressure in the rodless cavity 6 is greater than the elastic force of the spring 9, the safety wet brake is triggered to start braking, the oil pressure at the outlet of the pressure regulating valve 2 is positively correlated with the descending stroke of the control pedal, the braking force of the electric feedback brake device is positively correlated with the oil pressure at the outlet of the pressure regulating valve 2, and the braking force of the brake is positively correlated with the oil pressure at the outlet of the pressure regulating valve 2. The brake pedal 3 is stepped on, the oil pressure at the outlet of the pressure regulating valve 2 is gradually increased, when the pressure sensor 4 detects that the oil pressure is greater than 0, the electric feedback brake device starts to brake, and the larger the descending stroke of the brake pedal 3 is, the larger the oil pressure at the outlet of the pressure regulating valve 2 is, and the larger the braking force of the electric feedback brake device is. When the downward stroke of the brake pedal 3 is larger and larger, and the oil pressure at the outlet of the pressure regulating valve 2 is increased to be larger than the elastic force of the spring 9, the oil pressure pushes the piston rod 8 to extend out of the piston cylinder 5, the larger the oil pressure at the outlet of the pressure regulating valve 2 is, the larger the stroke of the piston rod 8 extending out of the piston cylinder 5 is, and the larger the braking force of the brake is. Therefore, the electro-hydraulic combined braking of the vehicle is realized, and the safety of the vehicle is improved.
In the embodiment, the brake system further comprises a one-way sequence valve 11, an oil inlet of the one-way sequence valve 11 is communicated with an oil outlet of the pressure regulating valve 2, an oil outlet of the one-way sequence valve 11 is used for being communicated with the rodless cavity 6, and oil enters the rodless cavity 6 to trigger the non-safety brake to start braking.
In this embodiment, the one-way sequence valve 11 is a one-way sequence valve 11 capable of adjusting the opening pressure. The starting point of participation of the brake force in the braking process can be adjusted.
In this embodiment, the one-way sequence valve 11 is interposed between the pressure sensor 4 and the brake, and the opening set pressure of the one-way sequence valve 11 is p 6 Should satisfy p 6 ＜p 7 And p is 6 The size of the brake is adjustable, and the size of the brake is determined by the participation starting point of the brake force in the braking process. When the brake pedal 3 is gradually deepened, the pressure of the pressure regulating valve 2 is increased to p 6 When the one-way sequence valve 11 is opened in the forward direction, the brake starts to act, and the electric feedback braking force is kept constant. When the brake pedal 3 is lifted, the outlet pressure of the pressure regulating valve 2 is gradually reduced until the outlet pressure is zero, the pressure oil in the brake cavity is drained through the check valve inside the check sequence valve 11, and the brake is in a release state at the moment.
In this embodiment, the oil return port of the one-way sequence valve 11 and the oil return port of the pressure regulating valve 2 are both communicated with the oil tank 10. The excess oil is returned to the tank 10.
EXAMPLE III
The embodiment provides a hydraulic braking method of the brake based on the first embodiment and the second embodiment: the method comprises the following steps: the brake pedal 3 is stepped on, and the brake pedal 3 starts to regulate the oil outlet pressure of the pressure regulating valve 2; the pressure sensor 4 detects the change of the oil outlet pressure of the pressure regulating valve 2, a detection signal is transmitted to the electric feedback brake device to start braking, and the braking force of the electric feedback brake device changes according to the change of the oil outlet pressure of the pressure regulating valve 2 detected by the pressure sensor 4; the oil outlet pressure of the pressure regulating valve 2 simultaneously controls a piston cylinder 5 of the brake so as to control the braking force of the brake.
In the embodiment, when the brake is a safety brake, the brake pedal 3 is stepped, the pressure of the oil outlet of the pressure regulating valve 2 is regulated by the brake pedal 3 to be gradually reduced along with the descending of the brake pedal 3, and the electric feedback brake device gradually increases the braking force according to the signal of the pressure sensor 4; the oil pressure in the piston cylinder 5 of the brake is gradually reduced, so that the braking force of the brake is gradually increased; the brake pedal 3 is released, the pressure of the oil outlet of the pressure regulating valve 2 is gradually increased when the brake pedal 3 moves upwards, and the braking force of the electric feedback brake device and the brake is gradually reduced;
when the brake is a non-safety brake, the brake pedal 3 is stepped on, the pressure of the oil outlet of the pressure regulating valve 2 is regulated by the brake pedal 3 to gradually increase along with the descending of the brake pedal 3, the electric feedback brake device gradually increases the braking force according to the signal of the pressure sensor 4, and the oil pressure in the piston cylinder 5 of the brake gradually increases to gradually increase the braking force of the brake; when the brake pedal 3 is released, the pressure of the oil outlet of the pressure regulating valve 2 is gradually reduced when the brake pedal 3 moves upwards, and the braking force of the electric feedback braking device and the brake is gradually reduced.
In this embodiment, when the brake is a safety brake, the maximum outlet pressure value of the pressure regulating valve 2 is p 2 The full release pressure value of the safety brake is p 4 The pressure value of the two should satisfy p 2 >p 4 . When the brake pedal 3 is actuated, the outlet pressure of the pressure regulating valve 2 is controlled by p 2 Gradually decreases, the pressure value p detected by the pressure sensor 4 3 Is less than p 2 When the pressure value is gradually reduced, the braking force of the electric feedback braking device is gradually increased; when the brake pedal 3 is gradually deepened, the outlet pressure of the pressure regulating valve 2 is reduced to p 4 In the following, the brake starts to act due to the action of the spring force, and the braking force of the electric feedback brake device at this time is kept constant.
The control strategy in this embodiment is: (1) when p is 3 ＝p 2 When the brake is not applied, no brake is applied; (2) when p is 4 ≤p 3 <p 2 At the time, only the electric feedback brake device brakes, and p 3 The smaller the electric feedback brake device is, the larger the braking force of the electric feedback brake device is; (3) when p is 3 <p 4 When the brake is in use, the electric feedback brake device and the brake act at the same time, the braking force of the electric feedback brake device is kept maximum and constant, and the braking force of the brake is dependent on p 3 The brake force is reduced and increased step by step, and the feedback brake energy is generated as much as possible on the premise of ensuring the reliable braking of the whole vehicle. The safety of the vehicle can be improved, meanwhile, electric energy is recycled, and the cruising ability of the vehicle is improved.
When the brake is a non-safety brake, in the present embodiment, the brake circuit includes the pressure regulating valve 2, the pressure sensor 4, and the non-safety brake. The pressure sensor 4 measures the outlet pressure value of the pressure regulating valve 2 in real time, and the complete braking pressure value of the non-safety brake is p 7 The maximum pressure value of the outlet of the pressure sensor 4 is p 5 Should satisfy p 5 ≥p 7 Preferably p 5 -p 7 Less than 5bar; thereby enabling full braking by the brake.
When the driver steps down on the brake pedal 3, the outlet pressure of the pressure regulating valve 2 is gradually increased from 0, and the pressure value p detected by the pressure sensor 4 3 When the pressure value is larger than 0, starting the electric feedback brake device, and when the pressure value is gradually increased, the braking force of the electric feedback brake device is gradually increased; when the outlet pressure of the pressure regulating valve 2 is greater than the elastic force of the spring 9, the oil pressure pushes the piston rod 8 to extend out of the piston cylinder 5, the larger the oil pressure at the outlet of the pressure regulating valve 2 is, the larger the stroke of the piston rod 8 extending out of the piston cylinder 5 is, and the larger the braking force of the brake is.
The control strategy in this embodiment is: (1) when p is 3 No braking when = 0; (2) when 0 < p 3 ≤p 6 While only the electric regenerative brake is braking, and p 3 The larger the braking force of the electric feedback braking device is; (3) when p is 3 ＞p 6 When the brake is applied, the electric feedback brake and the brake are simultaneously applied, the force brake of the electric feedback brake is kept maximum and constant, and the brake force of the brake is dependent on p 3 Is increased by increasingOn the premise of ensuring the reliable braking of the whole vehicle, the regenerative braking energy is generated as much as possible.
The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims (7)

1. A brake hydraulic braking system characterized by: the brake device comprises a brake pedal, a pressure regulating valve and a pressure sensor, wherein the brake pedal is connected with the pressure regulating valve, the motion of the brake pedal is used for regulating the oil pressure at the outlet of the pressure regulating valve, the inlet of the pressure regulating valve is used for introducing high-pressure oil, the pressure sensor is used for measuring the oil pressure at the outlet of the pressure regulating valve, the pressure sensor is used for being electrically connected with an electric feedback brake device, the electric feedback brake device can regulate the braking force of the electric feedback brake device according to the oil pressure detected by the pressure sensor, the outlet of the pressure regulating valve is used for being communicated with a piston cylinder of a brake, the oil pressure flowing into a piston cylinder of the brake from the outlet of the pressure regulating valve is used for regulating the braking force of the brake, the brake is a safety brake, a spring for pushing a piston rod to extend out of a cylinder body of the piston cylinder is arranged in a rodless cavity of the piston cylinder, and a rod cavity of the piston cylinder is communicated with the outlet of the pressure regulating valve; when the oil pressure detected by the pressure sensor is smaller than the maximum oil pressure at the outlet of the pressure regulating valve, the electric feedback brake device is triggered to start braking, and when the oil pressure in the rod cavity is smaller than the elastic force of the spring, the brake is triggered to start braking; the oil hydraulic pressure at the outlet of the pressure regulating valve is in negative correlation with the descending stroke of the brake pedal, the braking force of the electric feedback brake device is in negative correlation with the oil hydraulic pressure at the outlet of the pressure regulating valve, and the braking force of the brake is in negative correlation with the oil hydraulic pressure at the outlet of the pressure regulating valve.
2. The brake hydraulic braking system of claim 1, wherein: the oil inlet of the explosion-proof electromagnetic valve is used for introducing high-pressure oil, and the oil outlet of the explosion-proof electromagnetic valve is communicated with the oil inlet of the pressure regulating valve.
3. The brake hydraulic braking system of claim 2, wherein: and the oil return port of the explosion-proof electromagnetic valve and the oil return port of the pressure regulating valve are communicated with an oil tank.
4. A brake hydraulic braking system characterized by: the brake pedal is connected with the pressure regulating valve, the brake pedal moves to regulate the oil pressure at the outlet of the pressure regulating valve, the inlet of the pressure regulating valve is used for introducing high-pressure oil, the pressure sensor is used for measuring the oil pressure at the outlet of the pressure regulating valve, the pressure sensor is electrically connected with an electric feedback brake device, the electric feedback brake device can regulate the braking force of the electric feedback brake device according to the oil pressure detected by the pressure sensor, the outlet of the pressure regulating valve is used for being communicated with a piston cylinder of a brake, the oil pressure flowing into a piston cylinder of the brake from the outlet of the pressure regulating valve is used for regulating the braking force of the brake, the brake is a non-safety brake, a spring for pushing a piston rod to contract into the cylinder body of the piston cylinder is arranged in a rod cavity of the piston cylinder of the non-safety brake, a rod-free cavity is communicated with the outlet of the pressure regulating valve, the non-safety brake further comprises a one-way sequence valve, an oil inlet of an oil outlet of the one-way sequence valve is communicated with the pressure regulating valve, an oil outlet of the one-way sequence valve is used for being communicated with the rod-free cavity, and the oil enters the non-safety sequence valve to trigger the non-safety brake.
5. The brake hydraulic braking system of claim 4, wherein: when the oil hydraulic pressure detected by the pressure sensor is greater than 0, the electric feedback brake device is triggered to start braking, when the oil hydraulic pressure in the rodless cavity is greater than the elastic force of the spring, the non-safety brake is triggered to start braking, the oil hydraulic pressure at the outlet of the pressure regulating valve is positively correlated with the descending stroke of the brake pedal, the braking force of the electric feedback brake device is positively correlated with the oil hydraulic pressure at the outlet of the pressure regulating valve, and the braking force of the brake is positively correlated with the oil hydraulic pressure at the outlet of the pressure regulating valve.
6. A brake hydraulic braking method based on the brake hydraulic braking system according to any one of claims 1 to 3, characterized in that: the method comprises the following steps: the brake pedal is stepped on, the pressure of an oil outlet of the pressure regulating valve is regulated by the brake pedal to be gradually reduced along with descending of the brake pedal, and the electric feedback brake device gradually increases the braking force; the oil hydraulic pressure in a piston cylinder of the brake is gradually reduced, so that the braking force of the brake is gradually increased; when the brake pedal is released, the pressure of the oil outlet of the pressure regulating valve is gradually increased when the brake pedal moves upwards, and the braking force of the electric feedback brake device and the brake is gradually reduced.
7. A brake hydraulic braking method based on the brake hydraulic braking system according to any one of claims 4 to 5, characterized in that: the method comprises the following steps: the brake pedal is stepped, the pressure of an oil outlet of the pressure regulating valve is regulated by the brake pedal to be gradually increased along with descending of the brake pedal, the electric feedback brake device gradually increases the braking force, and the oil hydraulic pressure in a piston cylinder of the brake is gradually increased to gradually increase the braking force of the brake; and when the brake pedal is released, the pressure of the oil outlet of the pressure regulating valve is gradually reduced when the brake pedal moves upwards, and the braking force of the electric feedback braking device and the brake is gradually reduced.
CN202111289980.8A 2021-11-02 2021-11-02 Hydraulic brake system and method of brake Active CN113911085B (en)

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DE102005055751B4 (en) * 2005-04-21 2018-09-06 Ipgate Ag Pressure modulator control
DE102016004489A1 (en) * 2016-04-18 2017-10-19 Wabco Gmbh Driver brake valve, compressed air brake system with the driver's brake valve and method of making the driver's brake valve
CN206766014U (en) * 2017-05-16 2017-12-19 中国煤炭科工集团太原研究院有限公司 A kind of mine vehicle hydraulic system with vehicle brake fade autoamtic protection device for forming
CN107344548A (en) * 2017-07-31 2017-11-14 安徽合力股份有限公司 A kind of Electro-hydraulic brake system for electri forklift Brake energy recovery
CN108859779B (en) * 2018-05-11 2020-07-03 中国煤炭科工集团太原研究院有限公司 Electro-hydraulic coupling braking system of alternating-current variable-frequency electric-driven transport vehicle and control method

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