CN112693440A - Integrated electro-hydraulic brake system automatic exhaust device and exhaust method - Google Patents
Integrated electro-hydraulic brake system automatic exhaust device and exhaust method Download PDFInfo
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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
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/002—Air treatment devices
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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
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/18—Safety devices; Monitoring
- B60T17/22—Devices for monitoring or checking brake systems; Signal devices
Abstract
The invention discloses an integrated electro-hydraulic brake system automatic exhaust device, which comprises: the integrated type electro-hydraulic brake comprises a hydraulic unit, a liquid storage tank, a main cylinder push rod and a motor, a brake main cylinder, an active cylinder, a plurality of integrated type electro-hydraulic brake electromagnetic valves and a hydraulic pipeline are integrated in the hydraulic unit, and the brake main cylinder is decoupled with the active cylinder. The invention also discloses an automatic exhaust method of the integrated electro-hydraulic brake system. Aiming at the problem that the air in a hydraulic pipeline is difficult to exhaust due to the decoupling of a brake main cylinder and a driving cylinder of the integrated electro-hydraulic brake system, the invention realizes the automatic and thorough exhaust of the integrated electro-hydraulic brake system by controlling the hydraulic cylinder, the motor and the integrated electro-hydraulic brake solenoid valve, and provides a perfect solution for the automatic exhaust of the fully decoupled integrated electro-hydraulic brake system.
Description
Technical Field
The invention belongs to an exhaust method of a brake system, and particularly relates to an automatic exhaust device and an exhaust method of an integrated electro-hydraulic brake system.
Background
At present, with the continuous development of automobile intellectualization and electromotion technology, the traditional vacuum boosting brake system is difficult to meet the requirements of intelligent automobiles and electric automobiles on the brake system, and is gradually replaced by a novel integrated electro-hydraulic brake system. Frequent operation of the brake system can result in air ingress. Once air appears in a hydraulic brake pipeline, the brake pressure can be reduced, even the brake fails, and great potential safety hazards exist. In the traditional exhaust method, one person steps on a brake pedal to the lowest end, the other person unscrews air release bolts on the brake wheel cylinders to release a certain amount of brake fluid and gas, then screws the bolts again to release the brake pedal, and repeats the actions until no air bubbles exist in the brake fluid discharged by the four wheel cylinders. This kind of mode not only needs two people to cooperate simultaneously, wastes time and energy, still needs frequently to loosen and screw up the bolt, influences the life of wheel cylinder.
For example, Chinese patent application No. 201320782492.5 discloses an exhaust device for a brake line of an automobile, in which a piston is driven in an acting cylinder to push a guide rod to drive a rotating pedal fixed with the guide rod to move, and the driving piston is returned under the action of a control valve and a return spring. The problem of high labor intensity is solved by replacing manual treading with air pressure, but automatic air exhaust cannot be realized, and an additional set of additional device is required. Chinese patent application No. 201220429748.2 discloses an electronic suction means of brake piping residual air, it is not thorough to solve to exhaust, waste time and energy, brake fluid corrodes operating personnel and polluted environment, cause extravagant scheduling problem, the characterized by includes the motor, motor output shaft connects the screw axle, screw axle drive piston, the external diameter of piston and the internal diameter cooperation of cylinder body, the cylinder body is equipped with the air vent towards the one end of motor, the sleeve passes the other end of cylinder body, the screw axle passes through planetary gear mechanism connecting sleeve, the one end that the sleeve is located the cylinder body is equipped with the oil drain hole, the cylinder body is equipped with the oil outlet who accesss to the stock solution bottle on the cylinder body chamber wall at. However, the system has relatively high cost, needs to additionally add more complex mechanical devices, needs to artificially judge the exhaust ending state, and cannot realize automatic exhaust. Chinese patent application number 201721180705.1 discloses an automatic exhaust device of an electro-hydraulic brake experiment bench, which can solve the problems that the brake exhaust process is time-consuming and labor-consuming, the exhaust is not thorough, the brake fluid corrodes operators and the like. The air exhaust of the braking system is realized by controlling the motor pressure build of the motor mechanical booster and detecting bubbles by the camera. However, the method is not suitable for an integrated electro-hydraulic brake system with a complex hydraulic pipeline, and in addition, the reliability of detecting bubbles in the pipeline by using a camera is insufficient, and the cost is high. Chinese patent application No. 201810601470.1 discloses an ESC automatic exhaust device and an exhaust method, which can relieve the problem that the normal operation of an ESC system is influenced by gas residue existing in the exhaust of the traditional method in the prior art. And the exhaust of the brake system is realized through the cooperation of the ESC motor and the electromagnetic valve. However, because the ESC is arranged in the middle of the braking system, the method can not exhaust the gas between the brake master cylinder and the ESC pipeline completely, and the problem of incomplete exhaust still exists. In addition, the system controls the work of the motor and the electromagnetic valve according to the time process, and the exhaust is finished after the system works according to the flow, so that whether the system exhausts completely cannot be judged.
And because the integrated electro-hydraulic brake system is high in integration level and completely decoupled, the brake master cylinder and the active cylinder are in the same hydraulic system, and the gas in the brake system is difficult to exhaust by using the traditional method or by using the motor and the electromagnetic valve for exhaust. Therefore, it is very critical to provide an automatic exhaust device and method for a fully decoupled integrated electro-hydraulic brake system.
Disclosure of Invention
Therefore, the invention aims to provide an automatic exhaust device and an exhaust method for an integrated electro-hydraulic brake system, which can realize automatic exhaust for the fully decoupled integrated electro-hydraulic brake system and solve the problems that the traditional exhaust method needs two persons to be matched simultaneously, wastes time and labor, exhausts incompletely, needs to loosen and tighten bolts frequently and affects the service life of a wheel cylinder.
In order to achieve the purpose, the invention adopts the following technical scheme:
an integrated form electric liquid braking system self-bleeding device, the device is used for separately exhausting to the brake master cylinder and the initiative jar return circuit of the integrated braking system of decoupling type, it includes: the device comprises an integrated electro-hydraulic brake, a hydraulic cylinder, a first electromagnetic valve, a stroke sensor, a hydraulic motor, a brake wheel cylinder, a flow dividing and collecting valve, a second electromagnetic valve, a bubble detector and a controller;
the integrated electro-hydraulic brake comprises a hydraulic unit, a liquid storage tank, a main cylinder push rod and a motor, wherein the liquid storage tank is arranged at the upper part of the hydraulic unit; a brake master cylinder, a driving cylinder, a plurality of integrated electro-hydraulic brake electromagnetic valves and a hydraulic pipeline are integrated in the hydraulic unit, and the brake master cylinder is decoupled with the driving cylinder; a main cylinder push rod is assembled on the brake main cylinder, a stroke sensor is arranged on the main cylinder push rod, and a motor is assembled on the driving cylinder; the integrated electro-hydraulic brake electromagnetic valve, the stroke sensor and the motor are electrically connected with the controller;
the hydraulic cylinder is a two-cavity piston hydraulic cylinder and comprises a hydraulic cylinder push rod, a first cavity and a second cavity, and the hydraulic cylinder push rod is connected with the main cylinder push rod and can drive the main cylinder push rod to move horizontally; the inner cavity of the hydraulic cylinder is divided into a first cavity and a second cavity by the hydraulic cylinder push rod;
the first electromagnetic valve is a three-position four-way electromagnetic valve and is electrically connected with the controller; when the first electromagnetic valve is in a power-off state, the first electromagnetic valve is switched to an intermediate working position, and at the moment, two inlets of the first electromagnetic valve are communicated with each other; when the position is switched to the position A, the two inlets are communicated with the corresponding outlets, and when the position is switched to the position B, the two inlets are communicated with the outlets in a crossed manner; two outlets of the first electromagnetic valve are respectively communicated with the first cavity and the second cavity through pipelines, two inlets of the first electromagnetic valve are respectively connected with the hydraulic motor and the hydraulic oil barrel through pipelines, and the hydraulic motor is electrically connected with the controller;
the brake wheel cylinders comprise an FR brake wheel cylinder, an FL brake wheel cylinder, an RR brake wheel cylinder and an RL brake wheel cylinder, liquid inlets of the four brake wheel cylinders are communicated with four outlets of the integrated electro-hydraulic brake through pipelines, liquid outlets of the four brake wheel cylinders are communicated with a liquid inlet of the flow dividing and collecting valve through a pipeline, and a liquid outlet of the flow dividing and collecting valve is communicated with an inlet of the second electromagnetic valve;
the second electromagnetic valve is a high-flow two-position two-way normally closed switch valve which is electrically connected with the controller and is in a normally closed state when power is off; the outlet of the second electromagnetic valve is communicated with the liquid storage tank through a pipeline, a bubble detector is also connected in the corresponding liquid outlet pipeline, and the bubble detector is electrically connected with the controller.
The invention adopts the technical scheme that the method has the beneficial effects that: the invention provides an automatic exhaust device of an integrated electro-hydraulic brake system, which aims at the problem that the air in a hydraulic pipeline is difficult to exhaust due to the decoupling of a brake master cylinder and a driving cylinder of the integrated electro-hydraulic brake system, realizes the automatic and thorough exhaust of the integrated electro-hydraulic brake system by controlling a hydraulic cylinder, a motor and an electromagnetic valve of the integrated electro-hydraulic brake, and provides a perfect solution for the automatic exhaust of the fully decoupled integrated electro-hydraulic brake system.
Preferably, the pipeline that hydraulic motor and first solenoid valve are connected still is connected with the overflow valve, and hydraulic motor's income liquid mouth and the liquid outlet of overflow valve all communicate with the hydraulic oil bucket.
The invention accurately controls the state of the three-position four-way solenoid valve according to the displacement of the push rod of the main cylinder, and prevents the system from overloading by arranging the overflow valve, thereby having higher safety.
Preferably, the liquid storage tank is connected with a first hydraulic pipeline, a second hydraulic pipeline and a third hydraulic pipeline, the liquid storage tank is respectively communicated with the actuating cylinder and the brake wheel cylinder through the first hydraulic pipeline, the liquid storage tank is communicated with the brake master cylinder through the second hydraulic pipeline and the third hydraulic pipeline, the brake master cylinder is communicated with the brake wheel cylinder through a fourth hydraulic pipeline, and the brake master cylinder is respectively communicated with the actuating cylinder and the brake wheel cylinder through a fifth hydraulic pipeline.
Preferably, the bubble detector is an ultrasonic bubble detector.
The ultrasonic bubble detector is a sensor specially used for detecting bubbles in a hydraulic pipeline by utilizing the characteristic that the acoustic impedance difference between air and water is large. The ultrasonic bubble detector is used for detecting whether bubbles exist in a pipeline connected with a liquid outlet of the second electromagnetic valve or not and transmitting result information to the controller in real time.
Preferably, a filter is connected between the second electromagnetic valve and the pipeline communicated with the liquid storage tank.
According to the invention, the hydraulic oil discharged by the brake wheel cylinder is filtered and then directly introduced into the liquid storage tank through the pipeline, and brake fluid does not need to be added in the whole exhaust process, so that the two problems that the brake fluid cannot be recycled and reused and the ground is polluted by the sprayed brake fluid are solved.
Preferably, the controller drives the relevant actuators in the integrated electro-hydraulic brake to work through a driver connected with the controller, and the controller and the actuators are both powered through a 12V direct current power supply.
Preferably, the controller is available from MicroAutobox II 1401/1512 of Dspace, and the driver is available from RapidPro of Dspace.
The invention also provides an automatic exhaust method of the integrated electro-hydraulic brake system, which comprises the following steps:
the method comprises the following steps: compiling the program and loading the program into the controller;
step two: under the power-off state of the integrated electro-hydraulic brake, the controller controls the hydraulic motor to start working and controls the first electromagnetic valve to be switched to the B working position at the same time, and the hydraulic cylinder push rod pushes the master cylinder push rod to build pressure for four brake wheel cylinders;
step three: when the stroke sensor detects that the push rod of the master cylinder reaches the maximum displacement, the controller controls the first electromagnetic valve to be switched to the middle working position, and meanwhile, the hydraulic motor is closed;
step four: opening the second electromagnetic valve, closing after lasting for 0.5-1.5s, and simultaneously detecting whether bubbles exist in the liquid pipeline by a bubble detector; if bubbles exist, controlling the first electromagnetic valve to be switched to the working position A, starting the hydraulic motor to enable the hydraulic cylinder to return, detecting the return of the main cylinder push rod to the initial position by the stroke sensor, closing the first electromagnetic valve and the hydraulic motor, and switching to the step two; if no bubble exists, the integrated electro-hydraulic brake master cylinder and related pipelines are exhausted, the first electromagnetic valve is controlled to be switched to the working position A, and the hydraulic motor is started to enable the hydraulic cylinder to return; after the stroke sensor detects that the push rod of the main cylinder returns to the initial position, closing the first electromagnetic valve and the hydraulic motor, and continuing to perform the step five;
step five: the controller sends a control command to control the integrated electro-hydraulic brake to close the two brake master cylinder isolation valves, open the two master cylinder suction valves and simultaneously control the motor to operate to the maximum working position to build pressure for the four brake wheel cylinders;
step six: opening the second electromagnetic valve, closing after lasting for 0.5-1.5s, and simultaneously detecting whether bubbles exist in the liquid pipeline by a bubble detector; if bubbles exist, the controller controls the motor to reach the initial position and then switches to the fifth step; if no bubble exists, the integrated electro-hydraulic brake master cylinder and the related pipeline are exhausted, and the seventh step is continued;
step seven: and closing all the devices, and finishing the automatic exhaust of the integrated electro-hydraulic brake system.
The invention provides an automatic exhaust device and method for an integrated electro-hydraulic brake system, aiming at the problem that the air in a hydraulic pipeline of the integrated electro-hydraulic brake system is difficult to exhaust due to the decoupling of a brake master cylinder and a driving cylinder, the automatic and thorough exhaust of the integrated electro-hydraulic brake system is realized by controlling a hydraulic cylinder, a motor and an integrated electro-hydraulic brake solenoid valve, and a perfect solution is provided for the automatic exhaust of the fully decoupled integrated electro-hydraulic brake system.
According to the invention, the hydraulic motor drives the hydraulic cylinder to work to replace a person to step on a pedal to exhaust the brake master cylinder loop, so that the use of the person and the labor loss can be reduced, and in addition, the hydraulic cylinder can realize higher brake strength, so that the exhaust is faster and more thorough.
The invention realizes the thorough exhaust of the interior of the integrated brake by controlling the motor and the electromagnetic valve in the integrated electro-hydraulic brake system to work in cooperation with the exhaust device and utilizing the pressure build-up of the motor to exhaust the loop of the driving cylinder.
The invention adopts the flow dividing and collecting valve to converge the brake fluid distributed by the four wheel cylinders, and utilizes the ultrasonic bubble detector to detect the pipeline bubbles, thereby realizing accurate unified control and detection, saving the system cost and improving the exhaust efficiency.
The invention accurately controls the state of the three-position four-way solenoid valve according to the displacement of the push rod of the main cylinder, and prevents the system from overloading by arranging the overflow valve, thereby having higher safety.
According to the invention, the hydraulic oil discharged by the brake wheel cylinder is filtered and then directly introduced into the liquid storage tank through the pipeline, and brake fluid does not need to be added in the whole exhaust process, so that the two problems that the brake fluid cannot be recycled and reused and the ground is polluted by the sprayed brake fluid are solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic overall structure diagram of an integrated electro-hydraulic brake system automatic exhaust device in an embodiment of the invention.
Fig. 2 is a schematic overall structure diagram of an integrated electronically controlled brake system according to an embodiment of the present invention.
FIG. 3 is a flowchart illustrating the operation of the automatic exhaust method of the integrated electro-hydraulic brake system according to an embodiment of the present invention.
In the figure, 1, an integrated electro-hydraulic brake, 2, a hydraulic cylinder, 3, a first electromagnetic valve, 4, a stroke sensor, 5, a hydraulic motor, 6, an overflow valve, 7, an FR brake cylinder, 8, an FL brake cylinder, 9, an RR brake cylinder, 10, an RL brake cylinder, 11, a flow dividing and collecting valve, 12, a second electromagnetic valve, 13, an ultrasonic bubble detector, 14, a controller, 15, a direct current power supply, 16, a driver, 17, a filter, 101, a master cylinder push rod, 102, a liquid storage tank, 103, a motor, 104, a hydraulic unit, 201, a hydraulic cylinder push rod, 202, a first cavity, 203, a second cavity, 1041, a brake master cylinder, 1042, an active cylinder, 1043, a brake master cylinder isolation valve, 1044, an active cylinder suction valve, 1045, a first hydraulic pipeline, 1046, a second hydraulic pipeline, 1047, a third hydraulic pipeline, 1048, a fourth hydraulic pipeline, 1049, and a fifth hydraulic pipeline.
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 automatic exhaust device and the exhaust method of the integrated electro-hydraulic brake system according to the embodiment of the invention are described in detail with reference to fig. 1 to 3.
Example (b):
the embodiment of the invention provides an automatic exhaust device of an integrated electro-hydraulic brake system, which is used for respectively exhausting loops of a brake master cylinder 1041 and a driving cylinder 1042 of a decoupling integrated brake system. As shown in fig. 1, the automatic exhaust apparatus includes: the device comprises an integrated electro-hydraulic brake 1, a hydraulic cylinder 2, a first electromagnetic valve 3, a stroke sensor 4, a hydraulic motor 5, a brake wheel cylinder, a flow dividing and collecting valve 11, a second electromagnetic valve 12, a bubble detector and a controller 14; the dashed line portion in fig. 1 represents the control signal, and the solid line portion represents the hydraulic line.
The integrated electrohydraulic brake 1 comprises a hydraulic unit 104, a liquid storage tank 102, a master cylinder push rod 101 and a motor 103, wherein the liquid storage tank 102 is arranged at the upper part of the hydraulic unit 104 so as to supply hydraulic oil to the whole brake system; as shown in fig. 2, a master brake cylinder 1041, a master cylinder 1042, a plurality of integrated electro-hydraulic brake solenoid valves and hydraulic pipelines are integrated in the hydraulic unit 104, and the master brake cylinder 1041 is decoupled from the master cylinder 1042; the master cylinder 1041 is provided with a master cylinder push rod 101, namely, the master cylinder push rod 101 acts on the master cylinder 1041; a stroke sensor 4 is arranged on the master cylinder push rod 101; the master cylinder 1042 is provided with a motor 103, that is, the motor 103 acts on the master cylinder 1042; the integrated electro-hydraulic brake solenoid valve, the stroke sensor 4 and the motor 103 are electrically connected with the controller 14, and the stroke sensor 4 can transmit stroke information of the master cylinder push rod 101 to the controller 14 in real time;
the hydraulic cylinder 2 is a two-cavity piston hydraulic cylinder and comprises a hydraulic cylinder push rod 201, a first cavity 202 and a second cavity 203, and the hydraulic cylinder push rod 201 is connected with the main cylinder push rod 101 and can drive the main cylinder push rod 101 to move horizontally left and right; the cylinder push rod 201 divides the inner cavity of the cylinder 2 into a first chamber 202 and a second chamber 203;
the first electromagnetic valve 3 is a three-position four-way electromagnetic valve and is electrically connected with the controller 14; when the first electromagnetic valve 3 is in a power-off state, the first electromagnetic valve is switched to an intermediate working position, and at the moment, two inlets of the first electromagnetic valve are communicated with each other; when the position is switched to the position A, the two inlets are communicated with the corresponding outlets, and when the position is switched to the position B, the two inlets are communicated with the outlets in a crossed manner; two outlets of the first electromagnetic valve 3 are respectively communicated with the first cavity 202 and the second cavity 203 through pipelines, two inlets are respectively connected with the hydraulic motor 5 and the hydraulic oil barrel through pipelines, and the hydraulic motor 5 is electrically connected with the controller 14; the first electromagnetic valve 3 can control the working mode of the hydraulic cylinder 2;
the brake wheel cylinders comprise an FR brake wheel cylinder 7, an FL brake wheel cylinder 8, an RR brake wheel cylinder 9 and an RL brake wheel cylinder 10, liquid inlets of the four brake wheel cylinders are communicated with four outlets of the integrated electro-hydraulic brake 1 through pipelines, liquid outlets of the four brake wheel cylinders are communicated with a liquid inlet of a flow dividing and collecting valve 11 through a pipeline, and a liquid outlet of the flow dividing and collecting valve 11 is communicated with an inlet of a second electromagnetic valve 12;
the second electromagnetic valve 12 is a large-flow two-position two-way normally closed switch valve, is electrically connected with the controller 14, and is in a normally closed state when power is off; the outlet of the second electromagnetic valve 12 is connected to the liquid storage tank 102 through a pipeline, and a bubble detector is connected to the corresponding liquid outlet pipeline and electrically connected to the controller 14.
In order to further optimize the technical scheme of the embodiment, an overflow valve 6 is further connected to a pipeline connecting the hydraulic motor 5 and the first electromagnetic valve 3, a safety pressure can be set to prevent the hydraulic cylinder 2 from being overloaded, and a liquid inlet of the hydraulic motor 5 and a liquid outlet of the overflow valve 6 are both communicated with a hydraulic oil barrel.
In order to further optimize the technical solution of the above embodiment, as shown in fig. 2, a first hydraulic pipeline 1045, a second hydraulic pipeline 1046 and a third hydraulic pipeline 1047 are connected to the reservoir 102, the reservoir 102 is respectively communicated with the master cylinder 1042 and the brake cylinder via the first hydraulic pipeline 1045, the reservoir 102 is respectively communicated with the master cylinder 1041 via the second hydraulic pipeline 1046 and the third hydraulic pipeline 1047, the master cylinder 1041 is communicated with the brake cylinder via a fourth hydraulic pipeline 1048, and the master cylinder 1041 is respectively communicated with the master cylinder 1042 and the brake cylinder via a fifth hydraulic pipeline 1049.
In order to further optimize the technical solution of the above embodiment, the bubble detector is an ultrasonic bubble detector 13. The ultrasonic bubble detector 13 is a sensor dedicated to detecting bubbles in a hydraulic line, taking advantage of the characteristic that the acoustic impedance of air and water is greatly different. The ultrasonic bubble detector 13 is configured to detect whether bubbles exist in a pipeline connected to the liquid outlet of the second electromagnetic valve 12, and transmit result information to the controller 14 in real time.
In order to further optimize the technical scheme of the above embodiment, a filter 17 is further connected between the pipeline connecting the second electromagnetic valve 12 and the liquid storage tank 102, and the hydraulic oil flowing out of the second electromagnetic valve 12 is filtered by the filter 17 and then flows back to the liquid storage tank 102 through the liquid outlet pipeline, so that the automatic supplement of the hydraulic oil in the automatic exhaust process is realized.
In order to further optimize the technical scheme of the embodiment, the controller 14 drives the relevant actuators in the integrated electro-hydraulic brake 1 to work through the driver 16 connected with the controller, and the controller 14 and the actuators are both powered through the 12V direct current power supply 15.
In order to further optimize the technical solution of the above embodiment, the controller 14 is made of MicroAutobox ii 1401/1512 product of Dspace, and the driver 16 is made of RapidPro product of Dspace.
In this embodiment, the controller 14 is powered by a MicroAutobox ii 1401/1512 product of Dspace corporation, and acquires a displacement signal of the master cylinder push rod 101 of the stroke sensor 4 and information of the ultrasonic bubble detector 13 in real time by supplying power through the 12V dc power supply 15, and sends a PWM command to control the operation of the first electromagnetic valve 3 and the second electromagnetic valve 12 through a program logic after processing. Meanwhile, the controller 14 can also send control signals of the motor 103 of the integrated electro-hydraulic brake 1 and the integrated electro-hydraulic brake solenoid valve pwm to the driver 16, and drive the relevant actuator to work through the driver 16.
The driver 16 adopts a RapidPro product of Dspace company, is powered by a 12V direct current power supply 15, and can amplify a signal level control command sent by the controller 14 into a power level and drive the motor 103 and the solenoid valve in the integrated electro-hydraulic brake 1 to work. The driver 16 may also send a feedback signal such as current to the controller 14 to implement closed-loop feedback control.
As shown in fig. 2, the overall structure of the integrated electronically controlled brake system is schematically illustrated, when the pedal is depressed in the power-off state, the hydraulic oil in the two chambers of the master cylinder 1041 is pushed to flow into the four wheel cylinders from the two circuits respectively, and during the process, the hydraulic oil passes through the master cylinder isolation valves 1043 of the two circuits and the liquid inlet valves of the four wheel cylinders. However, since the two master cylinder suction valves 1044 at the outlet of the master cylinder 1042 are closed, complete exhaust of the master cylinder 1042 and some of the lines cannot be achieved. If two master cylinder suction valves 1044 at the outlets of the master cylinder 1042 are opened when the pedal is stepped on, the two circuits are communicated in the middle, and because the pressures of the two circuits are basically consistent, the air in the master cylinder 1042 and a part of pipelines cannot be exhausted. If two master cylinder suction valves 1044 at the outlet of the master cylinder 1042 are opened and then the motor 103 is controlled to work, air in the master cylinder 1041 and a part of the pipeline cannot be exhausted because the master cylinder 1042 directly draws hydraulic oil from the reservoir tank 102. Therefore, only by designing a combined exhaust strategy, the air in the integrated electro-hydraulic brake system can be exhausted only by respectively exhausting the pipelines related to the master cylinder 1041 and the master cylinder 1042. The integrated automatic exhaust device of the electro-hydraulic brake system in the embodiment realizes the function, and the automatic exhaust method, as shown in fig. 3, comprises the following steps:
the method comprises the following steps: opening Matlab/Simulink software in the upper computer to compile the program, and opening Dspace corporation ControlDesk software in the upper computer to download the program into the controller 14;
step two: under the power-off state of the integrated electro-hydraulic brake 1, the controller 14 controls the hydraulic motor 5 to start working, and simultaneously controls the first electromagnetic valve 3 to be switched to the B working position, and the hydraulic cylinder push rod 201 pushes the master cylinder push rod 101 to build pressure for four brake wheel cylinders;
step three: when the stroke sensor 4 detects that the master cylinder push rod 101 reaches the maximum displacement, the controller 14 controls the first electromagnetic valve 3 to be switched to the middle working position, and simultaneously closes the hydraulic motor 5;
step four: opening the second electromagnetic valve 12, closing after lasting for 0.5-1.5s, and simultaneously detecting whether bubbles exist in the liquid pipeline by a bubble detector; if bubbles exist, controlling the first electromagnetic valve 3 to be switched to the working position A, starting the hydraulic motor 5 to enable the hydraulic cylinder 2 to return, detecting the return of the main cylinder push rod 101 to the initial position by the stroke sensor 4, closing the first electromagnetic valve 3 and the hydraulic motor 5, and switching to the step two; if no bubble exists, the integrated electro-hydraulic brake 1 finishes the exhaust of the brake master cylinder 1041 and related pipelines, controls the first electromagnetic valve 3 to be switched to the working position A, and starts the hydraulic motor 5 to enable the hydraulic cylinder 2 to return; after the stroke sensor 4 detects that the master cylinder push rod 101 returns to the initial position, closing the first electromagnetic valve 3 and the hydraulic motor 5, and continuing to perform the step five;
step five: the controller 14 sends a control command to control the integrated electro-hydraulic brake 1 to close the two brake master cylinder isolation valves 1043, open the two master cylinder suction valves 1044 and simultaneously control the motor 103 to operate to the maximum working position to build pressure for the four brake wheel cylinders;
step six: opening the second electromagnetic valve 12, closing after lasting for 0.5-1.5s, and simultaneously detecting whether bubbles exist in the liquid pipeline by a bubble detector; if bubbles exist, the controller 14 switches to the step five after controlling the motor 103 to the initial position; if no bubble exists, the driving cylinder 1042 of the integrated electro-hydraulic brake 1 and the related pipeline are exhausted, and the seventh step is continued;
step seven: and closing all the devices, and finishing the automatic exhaust of the integrated electro-hydraulic brake system.
Aiming at the problem that air in a hydraulic pipeline of the integrated electro-hydraulic brake system is difficult to exhaust due to the decoupling of a brake master cylinder 1041 and a driving cylinder 1042, the automatic and thorough exhaust of the integrated electro-hydraulic brake system is realized by controlling a hydraulic cylinder 2, a motor 103 and an integrated electro-hydraulic brake solenoid valve, and a perfect solution is provided for the automatic exhaust of the fully decoupled integrated electro-hydraulic brake system.
The invention accurately controls the state of the three-position four-way solenoid valve according to the displacement of the main cylinder push rod 101, and prevents the system from overloading by arranging the overflow valve 6, thereby having higher safety. According to the invention, the hydraulic motor 5 drives the hydraulic cylinder 2 to work to replace a person to step on a pedal to exhaust a loop of the brake master cylinder 1041, so that the use of personnel and the manpower loss can be reduced, and in addition, the hydraulic cylinder 2 can realize higher brake strength, so that the exhaust is faster and more thorough. According to the invention, through controlling the motor 103 and the electromagnetic valve in the integrated electro-hydraulic brake system to work in cooperation with the exhaust device, the motor 103 is used for building pressure to exhaust the loop of the driving cylinder 1042, and the complete exhaust in the integrated brake is realized. The invention adopts the flow dividing and collecting valve 11 to converge the brake fluid distributed by the four wheel cylinders, and utilizes the ultrasonic bubble detector 13 to detect the pipeline bubbles, thereby realizing accurate unified control and detection, saving the system cost and improving the exhaust efficiency. According to the invention, the hydraulic oil discharged from the brake wheel cylinder is filtered and then directly introduced into the liquid storage tank 102 through the pipeline, brake fluid does not need to be added in the whole exhaust process, and the two problems that the brake fluid cannot be recycled and reused and the ground is polluted by the sprayed brake fluid are solved.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. An integrated electro-hydraulic brake system automatic exhaust device, which is used for respectively exhausting a brake master cylinder (1041) loop and an active cylinder (1042) loop of a decoupling integrated brake system, and comprises: the device comprises an integrated electro-hydraulic brake (1), a hydraulic cylinder (2), a first electromagnetic valve (3), a stroke sensor (4), a hydraulic motor (5), a brake wheel cylinder, a flow dividing and collecting valve (11), a second electromagnetic valve (12), a bubble detector and a controller (14);
the integrated electro-hydraulic brake (1) comprises a hydraulic unit (104), a liquid storage tank (102), a master cylinder push rod (101) and a motor (103), wherein the liquid storage tank (102) is arranged at the upper part of the hydraulic unit (104); a master braking cylinder (1041), a driving cylinder (1042), a plurality of integrated electro-hydraulic brake solenoid valves and hydraulic pipelines are integrated in the hydraulic unit (104), and the master braking cylinder (1041) is decoupled with the driving cylinder (1042); a master cylinder push rod (101) is assembled on the brake master cylinder (1041), a stroke sensor (4) is arranged on the master cylinder push rod (101), and a motor (103) is assembled on the master cylinder (1042); the integrated electro-hydraulic brake electromagnetic valve, the stroke sensor (4) and the motor (103) are electrically connected with the controller (14);
the hydraulic cylinder (2) is a two-cavity piston hydraulic cylinder and comprises a hydraulic cylinder push rod (201), a first cavity (202) and a second cavity (203), and the hydraulic cylinder push rod (201) is connected with the main cylinder push rod (101) and can drive the main cylinder push rod (101) to move horizontally left and right; the inner cavity of the hydraulic cylinder (2) is divided into a first cavity (202) and a second cavity (203) by a hydraulic cylinder push rod (201);
the first electromagnetic valve (3) is a three-position four-way electromagnetic valve and is electrically connected with the controller (14); when the first electromagnetic valve (3) is in a power-off state, the first electromagnetic valve is switched to an intermediate working position, and at the moment, two inlets of the first electromagnetic valve are communicated with each other; when the position is switched to the position A, the two inlets are communicated with the corresponding outlets, and when the position is switched to the position B, the two inlets are communicated with the outlets in a crossed manner; two outlets of the first electromagnetic valve (3) are respectively communicated with the first cavity (202) and the second cavity (203) through pipelines, two inlets are respectively connected with the hydraulic motor (5) and the hydraulic oil barrel through pipelines, and the hydraulic motor (5) is electrically connected with the controller (14);
the brake wheel cylinders comprise an FR brake wheel cylinder (7), an FL brake wheel cylinder (8), an RR brake wheel cylinder (9) and an RL brake wheel cylinder (10), liquid inlets of the four brake wheel cylinders are communicated with four outlets of the integrated electrohydraulic brake (1) through pipelines, liquid outlets of the four brake wheel cylinders are communicated with a liquid inlet of the flow dividing and collecting valve (11) through pipelines, and a liquid outlet of the flow dividing and collecting valve (11) is communicated with an inlet of a second electromagnetic valve (12);
the second electromagnetic valve (12) is a large-flow two-position two-way normally closed switch valve, is electrically connected with the controller (14) and is in a normally closed state when power is off; the outlet of the second electromagnetic valve (12) is communicated with the liquid storage tank (102) through a pipeline, a bubble detector is also connected in the corresponding liquid outlet pipeline, and the bubble detector is electrically connected with the controller (14).
2. The integrated automatic exhaust device of the electro-hydraulic brake system according to claim 1, wherein an overflow valve (6) is further connected to a pipeline connecting the hydraulic motor (5) and the first electromagnetic valve (3), and a fluid inlet of the hydraulic motor (5) and a fluid outlet of the overflow valve (6) are both communicated with a hydraulic oil barrel.
3. The integrated automatic exhaust device of the electro-hydraulic brake system according to claim 1, wherein a first hydraulic pipeline (1045), a second hydraulic pipeline (1046) and a third hydraulic pipeline (1047) are connected to the reservoir (102), the reservoir (102) is respectively communicated with the master cylinder (1042) and the brake cylinder through the first hydraulic pipeline (1045), the reservoir (102) is respectively communicated with the master cylinder (1041) through the second hydraulic pipeline (1046) and the third hydraulic pipeline (1047), the master cylinder (1041) is communicated with the brake cylinder through a fourth hydraulic pipeline (1048), and the master cylinder (1041) is respectively communicated with the master cylinder (1042) and the brake cylinder through a fifth hydraulic pipeline (1049).
4. The integrated electro-hydraulic brake system automatic exhaust device according to claim 1, wherein the bubble detector is an ultrasonic bubble detector (13).
5. The integrated electro-hydraulic brake system automatic exhaust device according to claim 1, wherein a filter (17) is further connected between the pipeline for communicating the second solenoid valve (12) with the reservoir (102).
6. The integrated electro-hydraulic brake system automatic exhaust device according to any one of claims 1-5, characterized in that the controller (14) drives the relevant actuator in the integrated electro-hydraulic brake (1) to work through a driver (16) connected with the controller, and the controller (14) and the actuator are both powered through a 12V direct current power supply (15).
7. The integrated electro-hydraulic brake system automatic exhaust device according to claim 6, wherein the controller (14) is available from MicroAutobox II 1401/1512 of Dspace, and the driver (16) is available from RapidPro of Dspace.
8. An automatic exhaust method of an integrated electro-hydraulic brake system is characterized by comprising the following steps:
the method comprises the following steps: compiling and loading the program into the controller (14);
step two: under the power-off state of the integrated electro-hydraulic brake (1), the controller (14) controls the hydraulic motor (5) to start working, and simultaneously controls the first electromagnetic valve (3) to be switched to a B working position, and the hydraulic cylinder push rod (201) pushes the master cylinder push rod (101) to build pressure for four brake wheel cylinders;
step three: when the stroke sensor (4) detects that the master cylinder push rod (101) reaches the maximum displacement, the controller (14) controls the first electromagnetic valve (3) to be switched to the middle working position, and meanwhile, the hydraulic motor (5) is closed;
step four: opening the second electromagnetic valve (12), closing after lasting for 0.5-1.5s, and simultaneously detecting whether bubbles exist in the liquid pipeline by the bubble detector; if bubbles exist, controlling the first electromagnetic valve (3) to be switched to the working position A, starting the hydraulic motor (5) to enable the hydraulic cylinder (2) to return, detecting the return of the main cylinder push rod (101) to the initial position by the stroke sensor (4), closing the first electromagnetic valve (3) and the hydraulic motor (5), and switching to the step two; if no bubble exists, the integrated electro-hydraulic brake (1) finishes the exhaust of a brake master cylinder (1041) and related pipelines, controls the first electromagnetic valve (3) to be switched to the working position A, and starts the hydraulic motor (5) to enable the hydraulic cylinder (2) to return; when the stroke sensor (4) detects that the master cylinder push rod (101) returns to the initial position, closing the first electromagnetic valve (3) and the hydraulic motor (5), and continuing to perform the fifth step;
step five: the controller (14) sends a control command to control the integrated electro-hydraulic brake (1) to close the two brake master cylinder isolation valves (1043), open the two master cylinder suction valves (1044), and simultaneously control the motor (103) to operate to the maximum working position to build pressure for the four brake wheel cylinders;
step six: opening the second electromagnetic valve (12), closing after lasting for 0.5-1.5s, and simultaneously detecting whether bubbles exist in the liquid pipeline by the bubble detector; if the bubbles exist, the controller (14) switches to the step five after controlling the motor (103) to the initial position; if no bubble exists, the active cylinder (1042) of the integrated electro-hydraulic brake (1) and related pipelines are exhausted, and the seventh step is continued;
step seven: and closing all the devices, and finishing the automatic exhaust of the integrated electro-hydraulic brake system.
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| CN202011457363.XA CN112693440B (en) | 2020-12-10 | 2020-12-10 | Automatic exhaust device and exhaust method for integrated electrohydraulic braking system |
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| CN113147705A (en) * | 2021-06-04 | 2021-07-23 | 吉林大学 | Brake system for unmanned vehicle |
| CN113212402A (en) * | 2021-06-23 | 2021-08-06 | 中国第一汽车股份有限公司 | Integrated braking system and integrated braking system control method |
| CN114435333A (en) * | 2022-03-11 | 2022-05-06 | 东风汽车集团股份有限公司 | Device and method for monitoring exhaust effect of brake pipeline |
| CN115949884A (en) * | 2023-01-03 | 2023-04-11 | 中冶赛迪技术研究中心有限公司 | Refueling system |
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