CN113002517A - Exhaust device and exhaust method of brake electric control system test bed - Google Patents
Exhaust device and exhaust method of brake electric control system test bed Download PDFInfo
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- CN113002517A CN113002517A CN202110327469.6A CN202110327469A CN113002517A CN 113002517 A CN113002517 A CN 113002517A CN 202110327469 A CN202110327469 A CN 202110327469A CN 113002517 A CN113002517 A CN 113002517A
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- brake caliper
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- release valve
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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
- B60T17/221—Procedure or apparatus for checking or keeping in a correct functioning condition of brake systems
- B60T17/222—Procedure or apparatus for checking or keeping in a correct functioning condition of brake systems by filling or bleeding of hydraulic systems
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/66—Electrical control in fluid-pressure brake systems
Abstract
The invention relates to the technical field of automobiles, in particular to an exhaust device and an exhaust method of a brake electric control system test bed, wherein the exhaust device of the brake electric control system test bed comprises a first exhaust assembly, a first air release valve and a first brake caliper, wherein the first exhaust assembly comprises the first air release valve and the first brake caliper which are sequentially communicated, and the first air release valve is communicated with a left front oil outlet of a brake electric control system; the second exhaust assembly comprises a second air release valve and a second brake caliper which are sequentially communicated, and the second air release valve is communicated with a right front oil outlet of the brake electronic control system; the third exhaust assembly comprises a third air release valve and a third brake caliper which are sequentially communicated, and the third air release valve is communicated with a left rear oil outlet of the brake electronic control system; and the fourth exhaust assembly comprises a fourth air release valve and a fourth brake caliper which are sequentially communicated, and the fourth air release valve is communicated with a right rear oil outlet of the brake electronic control system. The invention can discharge the air of the test bed and is convenient to carry along with the vehicle.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to an exhaust device and an exhaust method of a brake electric control system test bed.
Background
Along with the development of automobile intellectualization and networking, more and more vehicles begin to carry an integrated brake electronic control system (IBC), a manual cylinder and a pedal simulation cylinder in the IBC are communicated, and a servo cylinder is communicated with a brake device. Before the IBC is used, an IBC performance test bed needs to be established to solve the problem of the IBC and perform test approval on the performance of the IBC, air in a braking system needs to be exhausted before the IBC is tested, the existing test bed exhaust mode is vacuum pumping liquid injection and exhaust, but a special vacuum pumping liquid injection device is needed in the method, and the device is large in size, complex in structure and incapable of being carried along with a vehicle.
Therefore, an exhaust device and an exhaust method for a brake electric control system test stand are needed to solve the above technical problems.
Disclosure of Invention
The invention aims to provide an exhaust device and an exhaust method for a brake electric control system test bed, which can exhaust air of the test bed, reduce the volume of the exhaust device and facilitate carrying on a vehicle.
In order to achieve the purpose, the invention adopts the following technical scheme:
an exhaust apparatus of a brake electric control system test stand, comprising:
the first exhaust assembly comprises a first air release valve and a first brake caliper which are sequentially communicated, and the first air release valve is communicated with a left front oil outlet of the brake electric control system;
the second exhaust assembly comprises a second air release valve and a second brake caliper which are sequentially communicated, and the second air release valve is communicated with a right front oil outlet of the brake electronic control system;
the third exhaust assembly comprises a third air release valve and a third brake caliper which are sequentially communicated, and the third air release valve is communicated with a left rear oil outlet of the brake electronic control system;
the fourth exhaust assembly comprises a fourth air release valve and a fourth brake caliper which are sequentially communicated, and the fourth air release valve is communicated with a right rear oil outlet of the brake electronic control system;
and the actuating cylinder is connected with a push rod of the brake electronic control system and can push the push rod to move so as to exhaust air in the manual cylinder and the pedal simulation cylinder through the first air release valve, the second air release valve, the third air release valve and the fourth air release valve, and exhaust air in the servo cylinder and the brake device through the first brake caliper, the second brake caliper, the third brake caliper and the fourth brake caliper.
Further, the first brake caliper, the second brake caliper, the third brake caliper and the fourth brake caliper are all provided with air bleeding bolts, and the air bleeding bolts are all in an open state when the servo cylinder and the brake device are exhausted.
Further, a first pressure sensor is arranged at the left front oil outlet; a second pressure sensor is arranged at the right front oil outlet; a third pressure sensor is arranged at the left rear oil outlet; and a fourth pressure sensor is arranged at the right rear oil outlet.
Furthermore, a displacement sensor and a force sensor are arranged on the actuating cylinder, the displacement sensor is used for detecting the extension length of the piston of the actuating cylinder, and the force sensor is used for detecting the acting force of the piston of the actuating cylinder.
Further, a first switch valve is arranged between the first deflation valve and the first brake caliper, a second switch valve is arranged between the second deflation valve and the second brake caliper, a third switch valve is arranged between the third deflation valve and the third brake caliper, and a fourth switch valve is arranged between the fourth deflation valve and the fourth brake caliper.
The exhaust method of the brake electric control system test bed, which uses the exhaust device of the brake electric control system test bed, comprises the following steps:
s1, brake fluid is added into a brake electric control system, the brake electric control system is electrified, a pedal simulator valve is opened to enable a manual cylinder to be communicated with the pedal simulator cylinder, a servo cylinder valve is closed, the manual cylinder valve is opened to enable the manual cylinder to be communicated with a first air release valve, a second air release valve, a third air release valve and a fourth air release valve;
s2, opening the first air release valve, closing the second air release valve, the third air release valve and the fourth air release valve, enabling an actuating cylinder to push a push rod of the brake electronic control system to move to 70% of the stroke of the actuating cylinder, stopping for a first set time, controlling the first air release valve to be closed within the first set time, then enabling a piston of the actuating cylinder to retract to an initial position, stopping for a second set time, and controlling the first air release valve to be opened within the second set time;
s3, repeating the step S2 for a plurality of times;
s4, replacing the first air release valve in the step S2 with the second air release valve, the third air release valve and the fourth air release valve in sequence, and executing the steps S2 and S3 to exhaust air in the manual cylinder and the pedal simulation cylinder;
s5, closing the pedal simulator valve and the manual cylinder valve, and opening the servo cylinder valve to enable the servo cylinder to be communicated with the first brake caliper, the second brake caliper, the third brake caliper and the fourth brake caliper;
s6, opening the first brake caliper, closing the second brake caliper, the third brake caliper and the fourth brake caliper, enabling the actuating cylinder to push a push rod of the brake electronic control system to move to 70% of the stroke of the servo cylinder, stopping the first set time, controlling the first brake caliper to be closed within the first set time, then retracting the piston of the actuating cylinder to an initial position, stopping the second set time, and controlling the first brake caliper to be opened within the second set time;
s7, repeating the step S2 for a plurality of times;
and S8, replacing the first brake caliper in the step S2 with the second brake caliper, the third brake caliper and the fourth brake caliper in sequence, executing the step S6 and the step S7, and discharging air in the servo cylinder and the brake device.
Further, the first set time and the second set time are both 10 s.
Further, in the step S4, the following steps are adopted to determine whether the air evacuation in the manual cylinder and the pedal simulation cylinder meets the requirement:
s41, opening the first air release valve, the second air release valve, the third air release valve and the fourth air release valve, cutting off the power of the brake electronic control system, enabling the actuating cylinder to push the push rod to move at a set speed until the push rod reaches the full stroke of the manual cylinder, and recording a first relation curve between the displacement of the actuating cylinder and the input force of the actuating cylinder in the whole process, namely a relation curve between the resilience force of a piston spring in the manual cylinder and the displacement of the actuating cylinder;
s42, calculating a second relation curve of the rebound force of the pedal simulator combined spring in the pedal simulator cylinder and the displacement of the pedal simulator piston by using the following formula;
s43, obtaining a third relation curve of the target actuating cylinder input force and the actuating cylinder displacement by using the following formula;
s44, when the same cylinder displacement is l1Next, the target cylinder input force F is calculated2And actual cylinder input force F4Difference ratio between Δ F24
Target output hydraulic pressure P2And actual output hydraulic pressure P4Difference ratio Δ P between24
S45, when Δ F24<5％,ΔP24<And when 5% of the pressure in the manual cylinder and the pedal simulator cylinder are simultaneously satisfied, the gas in the manual cylinder and the pedal simulator cylinder is completely exhausted.
Further, in step S8, the following steps are adopted to determine whether the air evacuation in the servo cylinder and the brake device satisfies the requirement:
s81, determining a third relation curve V of the pressure of the first brake caliper and the volume of the first brake caliper1＝f(P1) Determining a fourth relationship curve V of the pressure of the third brake caliper to the volume of the third brake caliper2＝f(P1) (ii) a According to the third relation curve and the fourth relation curve, the following formula is used for calculating:
determining a target output hydraulic pressure P1Curve P as a function of the displacement of the actuating cylinder1＝f(l1)；
S82, when the same cylinder displacement is l1Next, the target output hydraulic pressure P is calculated1And actual output hydraulic pressure P3Difference ratio Δ P between13
S45, when Δ P13<When 5% is satisfied, it indicates that the air in the servo cylinder and the brake device is empty.
Further, in step S82, the cylinder displacement l1Is half of the full stroke of the manual cylinder.
The invention has the beneficial effects that:
the invention provides an exhaust device and an exhaust method of a brake electric control system test bed, a first exhaust component communicated with a left front oil outlet of a brake electric control system is arranged, a second exhaust component communicated with a right front oil outlet of the brake electric control system, a third exhaust component communicated with a left rear oil outlet of the brake electric control system, a fourth exhaust component communicated with the right rear oil outlet of the brake electric control system is arranged, the actuating cylinder is connected with a push rod of the brake electric control system, and the push rod can be pushed to move so as to discharge the air in the manual cylinder and the pedal simulation cylinder through the first air release valve, the second air release valve, the third air release valve and the fourth air release valve, and discharge the air in the servo cylinder and the brake device through the first brake caliper, the second brake caliper, the third brake caliper and the fourth brake caliper, so that the air in the test bed is completely discharged. Because the structure of first exhaust subassembly, second exhaust subassembly, third exhaust subassembly and fourth exhaust subassembly is comparatively simple, and the volume is less, when can be with the air escape of test bench, the vehicle-mounted is convenient for carry.
Drawings
FIG. 1 is a schematic view of an exhaust system of a test stand of a brake electric control system according to the present invention.
In the figure:
10. a brake electronic control system; 20. a first purge valve; 21. a first brake caliper; 22. a first pressure sensor; 30. a second purge valve; 31. a second brake caliper; 32. a second pressure sensor; 40. a third purge valve; 41. a third brake caliper; 42. a third pressure sensor; 50. a fourth purge valve; 51. a fourth brake caliper; 52. a fourth pressure sensor; 60. an actuating cylinder.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings and the embodiment. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.
In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In order to exhaust air of a test bed and reduce the volume of an exhaust device so as to be convenient to carry with a vehicle, the invention provides the exhaust device of the brake electric control system test bed, as shown in figure 1. This exhaust apparatus includes: a first exhaust assembly, a second exhaust assembly, a third exhaust assembly, a fourth exhaust assembly, and a cylinder 60.
The first exhaust assembly comprises a first air release valve 20 and a first brake caliper 21 which are sequentially communicated, and the first air release valve 20 is communicated with a left front oil outlet of the brake electronic control system 10; the second exhaust assembly comprises a second deflation valve 30 and a second brake caliper 31 which are sequentially communicated, and the second deflation valve 30 is communicated with a right front oil outlet of the brake electronic control system 10; the third exhaust assembly comprises a third air release valve 40 and a third brake caliper 41 which are sequentially communicated, and the third air release valve 40 is communicated with a left rear oil outlet of the brake electric control system 10; the fourth exhaust assembly comprises a fourth air release valve 50 and a fourth brake caliper 51 which are sequentially communicated, and the fourth air release valve 50 is communicated with a right rear oil outlet of the brake electric control system 10; the actuating cylinder 60 is connected with a push rod of the brake electronic control system 10 and can push the push rod to move so as to exhaust air in a manual cylinder and a pedal simulation cylinder through the first, second, third and fourth bleed valves 20, 30, 40 and 50, and exhaust air in a servo cylinder and a brake device through the first, second, third and fourth brake calipers 21, 31, 41 and 51.
Through the arrangement, a special exhaust device is not needed, the floor area of the test bed is greatly reduced, the development cost of the test bed is reduced, the exhaust fault rate is reduced, and the exhaust device can be popularized to exhaust on a vehicle carrying the brake electric control system 10.
Further, the first brake caliper 21, the second brake caliper 31, the third brake caliper 41 and the fourth brake caliper 51 need to be arranged on a plane 300-.
Further, the first brake caliper 21, the second brake caliper 31, the third brake caliper 41 and the fourth brake caliper 51 are each provided with a bleeder bolt, which is in an open state when the servo cylinder and the brake device are exhausted. Through setting up the bleeder bolt, can open when needs discharge the air in servo cylinder and the arresting gear, close when not needing, the control of being convenient for.
Further, a first pressure sensor 22 is arranged at the left front oil outlet; a second pressure sensor 32 is arranged at the right front oil outlet; a third pressure sensor 42 is arranged at the left rear oil outlet; a fourth pressure sensor 52 is provided at the right rear oil outlet. Through the arrangement, the pressure of the left front oil outlet, the pressure of the right front oil outlet, the pressure of the left rear oil outlet and the pressure of the right rear oil outlet of the brake electric control system 10 can be acquired, and data support is provided for the follow-up judgment of whether air is completely discharged.
Further, the cylinder 60 is provided with a displacement sensor for detecting the extension length of the piston of the cylinder 60 and a force sensor for detecting the acting force of the piston of the cylinder 60. The displacement of the push rod under the pushing of the piston of the actuating cylinder 60 can be indirectly detected through the displacement sensor, and the acting force on the push rod can be monitored in real time through the force sensor, so that the movement of the actuating cylinder 60 can be controlled in a displacement and force control mode, and the working state of the actuating cylinder 60 can be detected in real time.
Further, a first on-off valve is provided between the first bleed valve 20 and the first brake caliper 21, a second on-off valve is provided between the second bleed valve 30 and the second brake caliper 31, a third on-off valve is provided between the third bleed valve 40 and the third brake caliper 41, and a fourth on-off valve is provided between the fourth bleed valve 50 and the fourth brake caliper 51. Through setting up first ooff valve, second ooff valve, third ooff valve and fourth ooff valve, when needing to utilize the gassing bolt to carry out the gassing, open first ooff valve, second ooff valve, third ooff valve and fourth ooff valve at first. By the above mode, malfunction can be avoided. When the corresponding switch valve is opened, brake fluid and air in the brake circuit can flow into the corresponding brake caliper from the corresponding switch valve, and when the corresponding switch valve is closed, the brake fluid and the air are blocked from flowing into the corresponding brake caliper, so that the control flexibility is increased.
The embodiment also provides an exhaust method of a brake electric control system test bed, which uses the exhaust device of the brake electric control system test bed, and comprises the following steps:
s1, brake fluid is added into the brake electric control system 10, the brake electric control system 10 is powered on, the pedal simulator valve is opened to enable the manual cylinder to be communicated with the pedal simulator cylinder, the servo cylinder valve is closed, the manual cylinder valve is opened to enable the manual cylinder to be communicated with the first air release valve 20, the second air release valve 30, the third air release valve 40 and the fourth air release valve 50;
s2, opening the first air release valve 20, closing the second air release valve 30, the third air release valve 40 and the fourth air release valve 50, closing the first switch valve, the second switch valve, the third switch valve and the fourth switch valve, enabling the actuating cylinder 60 to push the push rod of the brake electronic control system 10 to move to 70% of the stroke of the manual cylinder at the speed of 70mm/S, stopping for a first set time, controlling the first air release valve 20 to be closed within the first set time, then enabling the piston of the actuating cylinder 60 to retract to the initial position, stopping for a second set time, and controlling the first air release valve 20 to be opened within the second set time;
s3, repeating step S2 several times, specifically, in the present embodiment, repeating step S2 five times; in other embodiments, the number of repetitions may be set according to actual needs, without any excessive restrictions;
s4, replacing the first air release valve 20 in the step S2 with a second air release valve 30, a third air release valve 40 and a fourth air release valve 50 in sequence, and executing the step S2 and the step S3 to exhaust air in the manpower cylinder and the pedal simulation cylinder;
s5, closing the pedal simulator valve and the manual cylinder valve, and opening the servo cylinder valve to enable the servo cylinder to be communicated with the first brake caliper 21, the second brake caliper 31, the third brake caliper 41 and the fourth brake caliper 51;
s6, opening the first brake caliper 21 and the first switch valve, closing the second brake caliper 31, the third brake caliper 41 and the fourth brake caliper 51 and the second switch valve, the third switch valve and the fourth switch valve, enabling the actuating cylinder 60 to push a push rod of the brake electronic control system 10 to move to 70% of the stroke of the servo cylinder at the speed of 70mm/S, stopping for a first set time, controlling the first brake caliper 21 to close within the first set time, then retracting the piston of the actuating cylinder 60 to the initial position, stopping for a second set time, and controlling the first brake caliper 21 to open within the second set time;
s7, repeating step S6 several times, and similarly, in the present embodiment, repeating step S6 five times; in other embodiments, the number of repetitions may be set according to actual needs, without any excessive restrictions;
s8, replacing the first caliper 21 in the step S6 with the second caliper 31, the third caliper 41 and the fourth caliper 51 in order, and executing the steps S6 and S7 to discharge the air in the servo cylinder and the brake device.
Through the mode, air in the manual cylinder and the pedal simulation cylinder is exhausted, and then air in the servo cylinder and the brake device is exhausted, so that air in the brake electronic system test bed is completely exhausted, and the size of the exhaust device is reduced while the air in the test bed is exhausted.
Further, the first set time and the second set time are both 10 s. Of course, in other embodiments, the first setting time and the second setting time may be increased or decreased according to actual needs, and not limited herein.
Further, in step S4, the following steps are taken to determine whether the air evacuation in the manual cylinder and the pedal simulation cylinder satisfies the requirements:
s41, opening the first air release valve 20, the second air release valve 30, the third air release valve 40 and the fourth air release valve 50, cutting off the power of the brake electronic control system 10, enabling the actuating cylinder 60 to push the push rod to move at a set speed until the push rod reaches the full stroke of the manual cylinder, and recording a first relation curve between the displacement of the actuating cylinder 60 and the input force of the actuating cylinder 60 in the whole process, namely a relation curve between the resilience force of a piston spring in the manual cylinder and the displacement of the actuating cylinder 60;
s42, calculating a second relation curve of the rebound force of the pedal simulator combined spring in the pedal simulator cylinder and the displacement of the pedal simulator piston by using the following formula;
s43, obtaining a third relation curve between the target cylinder 60 input force and the displacement of the cylinder 60 using the following formula;
wherein, F1For manual cylinder movementsResilience of the plug spring, F3Spring back force of pedal simulator combined spring in pedal simulator cylinder, F2 Target actuator cylinder 60 input force;
s44, the same cylinder 60 is displaced by l1Next, the input force F of the target cylinder 60 is calculated2Input force F to the actual cylinder 604Difference ratio between Δ F24
Target output hydraulic pressure P2And actual output hydraulic pressure P4Difference ratio Δ P between24
S45, when Δ F24<5％,ΔP24<When 5% of the pressure is met at the same time, the gas in the manual cylinder and the pedal simulator cylinder is exhausted.
When the manual cylinder has two chambers separated from each other, a check needs to be performed for each chamber. Through the mode, whether the gas in the manual cylinder and the pedal simulator cylinder is completely exhausted can be judged.
Further, in step S8, the following steps are taken to determine whether the air evacuation in the servo cylinder and the brake device satisfies the requirements:
s81, determining a third relation curve V of the pressure of the first brake caliper 21 and the volume of the first brake caliper 211＝f(P1) Determining a fourth relationship curve V of the pressure of the third brake caliper 41 to the volume of the third brake caliper 412＝f(P1) (ii) a According to the third relation curve and the fourth relation curve, the following formula is used for calculating:
determining a target output hydraulic pressure P1Curve P in relation to the displacement of the cylinder1＝f(l1)；
S82, the same cylinder 60 is displaced by l1Next, the target output hydraulic pressure P is calculated1And actual output hydraulic pressure P3Difference ratio Δ P between13
S45, when Δ P13<When 5% is satisfied, it indicates that the air in the servo cylinder and the brake device is empty.
Through the mode, whether the gas in the servo cylinder and the brake device is completely exhausted can be judged.
Further, in step S82, the cylinder 60 is displaced by l1The displacement of the actuating cylinder 60 is half of the full stroke of the manual cylinder, but can be adjusted according to actual requirements.
And finally, closing the first release valve 20, the second release valve 30, the third release valve 40 and the fourth release valve 50, closing the four release bolts, opening the first switch valve, the second switch valve, the third switch valve and the fourth switch valve, electrifying the brake electronic control system 10 and entering an initialization state, and finishing the whole exhaust process.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. An exhaust apparatus of a brake electric control system test stand, comprising:
the first exhaust assembly comprises a first air release valve (20) and a first brake caliper (21) which are sequentially communicated, and the first air release valve (20) is communicated with a left front oil outlet of the brake electronic control system (10);
the second exhaust assembly comprises a second air release valve (30) and a second brake caliper (31) which are sequentially communicated, and the second air release valve (30) is communicated with a right front oil outlet of the brake electronic control system (10);
the third exhaust assembly comprises a third air release valve (40) and a third brake caliper (41) which are sequentially communicated, and the third air release valve (40) is communicated with a left rear oil outlet of the brake electronic control system (10);
the fourth exhaust assembly comprises a fourth air release valve (50) and a fourth brake caliper (51) which are sequentially communicated, and the fourth air release valve (50) is communicated with a right rear oil outlet of the brake electronic control system (10);
and the actuating cylinder (60) is connected with a push rod of the brake electronic control system (10) and can push the push rod to move so as to discharge air in a manual cylinder and a pedal simulation cylinder through the first bleed valve (20), the second bleed valve (30), the third bleed valve (40) and the fourth bleed valve (50), and discharge air in a servo cylinder and a brake device through the first brake caliper (21), the second brake caliper (31), the third brake caliper (41) and the fourth brake caliper (51).
2. An exhaust device of a brake electric system test stand according to claim 1, characterized in that the first brake caliper (21), the second brake caliper (31), the third brake caliper (41) and the fourth brake caliper (51) are each provided with a bleeder bolt, which is in an open state when the servo cylinder and the brake device are exhausted.
3. An exhaust apparatus of a brake electric system test stand according to claim 1, wherein a first pressure sensor (22) is provided at said left front oil outlet; a second pressure sensor (32) is arranged at the right front oil outlet; a third pressure sensor (42) is arranged at the left rear oil outlet; and a fourth pressure sensor (52) is arranged at the right rear oil outlet.
4. An exhaust apparatus of a brake electric system test stand according to claim 1, wherein a displacement sensor for detecting a length of extension of a piston of the actuating cylinder (60) and a force sensor for detecting an acting force of the piston of the actuating cylinder (60) are provided on the actuating cylinder (60).
5. An exhaust apparatus of a brake electric system test stand according to claim 1, wherein a first on-off valve is provided between the first bleed valve (20) and the first brake caliper (21), a second on-off valve is provided between the second bleed valve (30) and the second brake caliper (31), a third on-off valve is provided between the third bleed valve (40) and the third brake caliper (41), and a fourth on-off valve is provided between the fourth bleed valve (50) and the fourth brake caliper (51).
6. A method of exhausting a test stand of a brake electric control system (10), using an exhaust apparatus of the test stand of the brake electric control system according to any one of claims 1 to 5, comprising the steps of:
s1, brake fluid is added into a brake electric control system (10), the brake electric control system (10) is electrified, a pedal simulator valve is opened to enable a manual cylinder to be communicated with the pedal simulator cylinder, a servo cylinder valve is closed, the manual cylinder valve is opened to enable the manual cylinder to be communicated with a first air release valve (20), a second air release valve (30), a third air release valve (40) and a fourth air release valve (50);
s2, opening the first air release valve (20), closing the second air release valve (30), the third air release valve (40) and the fourth air release valve (50), pushing a push rod of the brake electronic control system (10) to move to 70% of the stroke of the manual cylinder by an actuating cylinder (60), stopping for a first set time, controlling the first air release valve (20) to be closed within the first set time, then retracting a piston of the actuating cylinder (60) to an initial position, stopping for a second set time, and controlling the first air release valve (20) to be opened within the second set time;
s3, repeating the step S2 for a plurality of times;
s4, replacing the first air release valve (20) in the step S2 with the second air release valve (30), the third air release valve (40) and the fourth air release valve (50) in sequence, and executing the steps S2 and S3 to exhaust air in the manpower cylinder and the pedal simulation cylinder;
s5, closing the pedal simulator valve and the manual cylinder valve, and opening the servo cylinder valve to enable the servo cylinder to be communicated with the first brake caliper (21), the second brake caliper (31), the third brake caliper (41) and the fourth brake caliper (51);
s6, opening the first brake caliper (21), closing the second brake caliper (31), the third brake caliper (41) and the fourth brake caliper (51), enabling the actuating cylinder (60) to push a push rod of the brake electronic control system (10) to move to 70% of the stroke of the servo cylinder, stopping the first set time, controlling the first brake caliper (21) to be closed within the first set time, then retracting the piston of the actuating cylinder (60) to the initial position, stopping the second set time, and controlling the first brake caliper (21) to be opened within the second set time;
s7, repeating the step S6 for a plurality of times;
s8, replacing the first brake caliper (21) in the step S6 with the second brake caliper (31), the third brake caliper (41) and the fourth brake caliper (51) in sequence, and executing the steps S6 and S7 to discharge air in the servo cylinder and the brake device.
7. The exhaust method for a test stand of a brake electric control system (10) according to claim 6, wherein the first set time and the second set time are both 10 s.
8. The exhaust method for a test stand of a brake electric control system (10) according to claim 6, wherein the step of determining whether the air evacuation in the manual cylinder and the pedal simulation cylinder is satisfactory at step S4 comprises the steps of:
s41, opening the first air release valve (20), the second air release valve (30), the third air release valve (40) and the fourth air release valve (50), cutting off the power of the brake electronic control system (10), enabling the actuating cylinder (60) to push the push rod to move at a set speed until the push rod reaches the full stroke of the manual cylinder, and recording a first relation curve between the displacement of the actuating cylinder (60) and the input force of the actuating cylinder (60) in the whole process, namely a relation curve between the resilience force of a piston spring in the manual cylinder and the displacement of the actuating cylinder (60);
s42, calculating a second relation curve of the rebound force of the pedal simulator combined spring in the pedal simulator cylinder and the displacement of the pedal simulator piston by using the following formula;
s43, obtaining a third relation curve of the input force of the target actuating cylinder (60) and the displacement of the actuating cylinder (60) by using the following formula;
s44, when the same cylinder (60) has a displacement of l1Next, the input force F of the target cylinder 60 is calculated2Input force F to the actual cylinder (60)4Difference ratio between Δ F24
Target output hydraulic pressure P2And actual output hydraulic pressure P4Difference ratio Δ P between24
S45, when Δ F24<5％,ΔP24<And when 5% of the pressure in the manual cylinder and the pedal simulator cylinder are simultaneously satisfied, the gas in the manual cylinder and the pedal simulator cylinder is completely exhausted.
9. The exhaust method for a test stand of a brake electric control system (10) according to claim 6, wherein the step of determining whether air evacuation in the servo cylinder and the brake device is satisfactory at step S8 comprises the steps of:
s81, determining a third relation curve V of the pressure of the first brake caliper (21) and the volume of the first brake caliper (21)1＝f(P1) Determining a fourth relationship curve V of the pressure of the third brake caliper (41) to the volume of the third brake caliper (41)2＝f(P1) (ii) a According to the third relation curve and the fourth relation curve, the following formula is used for calculating:
determining a target output hydraulic pressure P1A curve P relating to the displacement of the actuating cylinder (60)1＝f(l1)；
S82, when the same cylinder (60) has a displacement of l1Next, the target output hydraulic pressure P is calculated1And actual output hydraulic pressure P3Difference ratio Δ P between13
S45, when Δ P13<When 5% is satisfied, it indicates that the air in the servo cylinder and the brake device is empty.
10. The exhaust method for a brake electric system test stand according to claim 9, wherein in step S82, the cylinder (60) is displaced by a distance/1Is half of the full stroke of the manual cylinder.
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| CN113945395A (en) * | 2021-11-22 | 2022-01-18 | 中国第一汽车股份有限公司 | IBC braking system test bench |
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