CN113492814A - Commercial vehicle and electronic parking braking system thereof - Google Patents
Commercial vehicle and electronic parking braking system thereof Download PDFInfo
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- CN113492814A CN113492814A CN202010254453.2A CN202010254453A CN113492814A CN 113492814 A CN113492814 A CN 113492814A CN 202010254453 A CN202010254453 A CN 202010254453A CN 113492814 A CN113492814 A CN 113492814A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/66—Electrical control in fluid-pressure brake systems
- B60T13/68—Electrical control in fluid-pressure brake systems by electrically-controlled valves
- B60T13/683—Electrical control in fluid-pressure brake systems by electrically-controlled valves in pneumatic systems or parts thereof
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Abstract
The invention provides a commercial vehicle and an electronic parking braking system thereof, and the scheme is as follows: the gas storage unit is respectively connected with gas circuits of the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve and the fourth electromagnetic valve; the first electromagnetic valve is electrically connected with the electronic control unit ECU and is respectively connected with the trailer valve and the rear axle module gas circuit; the second electromagnetic valve is electrically connected with the control switch and is connected with the trailer valve air passage; the third electromagnetic valve is electrically connected with the control switch, the third electromagnetic valve is respectively connected with the middle and rear axle diaphragm spring brake air chamber and the trailer valve air passage, and the rear axle module is connected with the middle and rear axle diaphragm spring brake air chamber air passage; the fourth solenoid valve is electrically connected with the control switch and is connected with the air passage of the trailer valve. The system realizes parking braking of the commercial vehicle in an electronic control mode, and integrates the functions of parking braking, automatic parking, hill starting, emergency braking, trailer position detection, trailer independent braking and the like in the vehicle running process.
Description
Technical Field
The invention relates to the technical field of automobile chassis, in particular to a commercial vehicle and an electronic parking braking system of the commercial vehicle.
Background
With the continuous progress of automobile electronic technology, the electronic control technology is more and more widely applied to automobiles, and the original mechanical control system is gradually developed into an electronic control system. In line with the trend of development, conventional manual mechanical parking is also beginning to be developed into an electronic parking system (EPB). The electronic parking brake system has various advantages such as easy operation, optimized cab space, safety, etc., compared to the conventional parking system.
At present, the commercial vehicle mostly adopts manual mechanical parking, and an electronic parking braking system integrating multiple functions is lacked.
In view of the above-mentioned drawbacks, the inventors of the present invention have finally obtained the present invention through a long period of research and practice.
Disclosure of Invention
The invention provides an electronic parking brake system for commercial vehicles and commercial vehicles, which realizes parking brake of the commercial vehicles in an electronic control mode and integrates the functions of parking brake, automatic parking, hill starting, emergency brake, trailer position detection, trailer independent brake and the like in the vehicle running process.
The technical scheme adopted by the invention is as follows:
on one hand, the electronic parking brake system for the commercial vehicle comprises an Electronic Control Unit (ECU), a gas storage unit 10, a control switch, a rear axle module 7, a trailer valve 9, a middle and rear axle diaphragm spring brake chamber 12, a control switch, a first electromagnetic valve 1, a second electromagnetic valve 14, a third electromagnetic valve 15 and a fourth electromagnetic valve 16;
the gas storage unit 10 is respectively connected with the gas circuits of the first electromagnetic valve 1, the second electromagnetic valve 14, the third electromagnetic valve 15 and the fourth electromagnetic valve 16;
the first electromagnetic valve 1 is electrically connected with the electronic control unit ECU, and the first electromagnetic valve 1 is respectively connected with a trailer valve 9 and a rear axle module 7 through gas circuits;
the second electromagnetic valve 14 is electrically connected with the control switch, and the second electromagnetic valve 14 is connected with the air passage of the trailer valve 9;
the third electromagnetic valve 15 is electrically connected with the control switch, the third electromagnetic valve 15 is respectively connected with the air passages of the middle and rear axle diaphragm spring brake air chamber 12 and the trailer valve 9, and the rear axle module 7 is connected with the air passage of the middle and rear axle diaphragm spring brake air chamber 12;
the fourth electromagnetic valve 16 is electrically connected with the control switch, and the fourth electromagnetic valve 16 is connected with the trailer valve 9 through an air passage.
Further, when the electronic control unit ECU judges that the automatic parking condition is met, the first electromagnetic valve 1 is controlled to be powered on, and the air outlet of the first electromagnetic valve 1 inputs air pressure to the control port 4 of the rear axle module 7 and the control port 41 of the trailer valve 9 respectively, so that the temporary parking brake of the main vehicle and the trailer is realized, and the automatic parking function is realized.
Further, the first electromagnetic valve 1 can output air pressures with different sizes according to different duty ratios; when the vehicle is parked automatically, the speed of the vehicle is zero.
Further, the second electromagnetic valve 14 is used for realizing a trailer position detection function; during detection, the second electromagnetic valve 14 is electrified through control of a control switch, then the second electromagnetic valve 14 inputs compressed air into a No. 43 control port of the trailer valve 9 to release parking braking of the trailer, at the moment, no air pressure is output from an air outlet of the third electromagnetic valve 15, and the parking braking of the trailer is realized by the aid of the middle and rear axle diaphragm spring braking air chamber 12; the second solenoid valve 14 is de-energized and the trailer position detection is exited.
Further, the second solenoid valve 14 is arranged at the frame rail.
Further, the third electromagnetic valve 15 is used for manually realizing parking braking and releasing;
when parking and braking are carried out, no air pressure is output from an air outlet of the third electromagnetic valve 15 by operating the control switch, at the moment, the parking pipeline has no air pressure, the main vehicle realizes parking under the action of the middle and rear axle diaphragm spring brake air chamber 12, and meanwhile, the air pressure of a No. 43 control port of the trailer valve 9 is zero, so that the trailer is braked;
when the parking brake is released, the air pressure output is made from the air outlet of the third electromagnetic valve 15 by operating the control switch, so that the compressed air enters the spring brake cylinder parking cavity of the diaphragm spring brake air chamber 12 of the middle and rear axles to release the parking brake of the trailer, and simultaneously the compressed air enters the No. 43 control port of the trailer valve 9 to release the pressure of the trailer control pipeline and release the trailer brake.
Further, the third electromagnetic valve 15 is arranged at the frame longitudinal beam, the third electromagnetic valve 15 has a manual release function, and parking or releasing of the parking brake of the vehicle can be manually realized when a vehicle circuit is in failure; the third solenoid valve 15 has a memory function, and can prevent the solenoid valve from being disabled due to normal open, and can ensure that the vehicle will not automatically perform parking braking if the solenoid valve is de-energized in a driving state.
Further, the fourth electromagnetic valve 16 is used for realizing independent braking and releasing of the trailer;
when the trailer is independently braked, the fourth electromagnetic valve 16 is in an electrified state, and the fourth electromagnetic valve 16 timely adjusts air pressure by operating a control switch, so that the air pressure at an air outlet of the fourth electromagnetic valve 16 is reduced to 4bar, the air pressure at a No. 43 control port of the trailer valve 9 is dynamically maintained at 4bar, the output air pressure at a No. 22 output port of the trailer valve 9 is controlled to be 4bar, and the independent brake of the trailer is realized;
when the independent brake of the trailer is released, the fourth electromagnetic valve 16 is powered off, and the air inlet valves of the fourth electromagnetic valve 16 are all opened, so that the air pressure of the output port and the air pressure of the input port of the fourth electromagnetic valve 16 are the same, and the independent brake of the trailer is released.
Further, the electronic parking brake system further includes an on-off valve 3,
the on-off valve 3 is arranged between the gas storage unit 10 and the third electromagnetic valve 15, and the on-off valve 3 is electrically connected with a control switch;
the on-off valve 3 is used for operating the control switch to park when an electronic control circuit and a control device of the electronic parking system fail.
In another aspect, a commercial vehicle is provided that includes the electronic parking brake system described above.
Compared with the prior art, the invention has the beneficial effects that:
the electronic parking brake system has the advantages of simple and labor-saving operation of the parking switch, improvement of driving and operating comfort, more use space of a cab, capability of realizing free starting and automatic driving away on a ramp, automatic parking function and capability of realizing automatic parking and automatic release.
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, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic diagram of an air circuit of an electronic parking brake system according to an embodiment of the present invention;
FIG. 2 is an enlarged view of the trailer valve of FIG. 1;
fig. 3 is an enlarged view of the rear axle module of fig. 1.
Detailed Description
The above and further features and advantages of the present invention are described in more detail below with reference to the accompanying drawings.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description of the present invention, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Fig. 1 is a schematic diagram of a gas circuit of an electronic parking brake system of this embodiment, and as shown in fig. 1, the electronic parking brake system of a commercial vehicle includes an electronic control unit ECU (not shown), a control switch (not shown), a first electromagnetic valve 1, an air processing unit 2, an on-off valve 3, a five-way valve 4 with a check valve, an air brake valve 5, a relay valve 6, a rear axle module 7, a differential relay valve 8, a trailer valve 9, an air storage unit 10, a front axle air chamber 11, a middle and rear axle diaphragm spring air chamber 12, a first two-way check valve 13, a second electromagnetic valve 14, a third electromagnetic valve 15, a fourth electromagnetic valve 16, and a second two-way check valve 17. The gas storage unit 10 is respectively connected with the gas circuits of the first electromagnetic valve 1, the second electromagnetic valve 14, the third electromagnetic valve 15 and the fourth electromagnetic valve 16; the first electromagnetic valve 1 is electrically connected with the electronic control unit ECU, and the first electromagnetic valve 1 is respectively connected with the trailer valve 9 and the rear axle module 7 through gas circuits; the second electromagnetic valve 14 is electrically connected with the control switch, and the second electromagnetic valve 14 is connected with the air passage of the trailer valve 9; the third electromagnetic valve 15 is electrically connected with the control switch, the third electromagnetic valve 15 is respectively connected with the air passages of the middle and rear axle diaphragm spring brake air chamber 12 and the trailer valve 9, and the rear axle module 7 is connected with the air passage of the middle and rear axle diaphragm spring brake air chamber 12; the fourth electromagnetic valve 16 is electrically connected with the control switch, and the fourth electromagnetic valve 16 is connected with the trailer valve 9 in an air path.
Specifically, as shown in fig. 1 to 3, parking braking and release: the parking brake can be realized by the third electromagnetic valve 15, the third electromagnetic valve 15 is arranged at a frame longitudinal beam, no air pressure is output from an air outlet No. 2 of the third electromagnetic valve 15 by operating an electronic switch during parking brake, at the moment, the parking pipeline has no air pressure, the tractor realizes parking under the spring action of a spring brake cylinder parking cavity, meanwhile, the air pressure is controlled to be zero by a control port No. 43 of a trailer valve 9, and the trailer controls the pipeline pressure output to realize the brake of the trailer; when the parking brake is released, the air pressure is output from the No. 2 air outlet of the third electromagnetic valve 15 by operating the electronic switch, the differential relay valve 8 is respectively connected between the third electromagnetic valve 15 and the middle and rear axle diaphragm spring brake air chambers 12, the No. 42 control port of the differential relay valve 8 is opened by compressed air, the compressed air enters the spring brake cylinder parking chamber to release the parking brake of the tractor, meanwhile, the compressed air enters the No. 43 control port of the trailer valve 9 from the first two-way one-way valve 13 of the parking loop to release the pressure of the trailer control pipeline, and the trailer brake is released. The third electromagnetic valve 15 has a manual release function, so that the parking brake of the vehicle can be manually released or applied when the vehicle circuit is in failure. The electromagnetic valve has a memory function, prevents the normally-on capacitor from easily causing the failure of the electromagnetic valve, and can ensure that the vehicle cannot automatically implement parking braking if the electromagnetic valve is powered off in a driving state.
Automatic parking: when the function is in an activated state and the vehicle speed is zero, the function is activated to automatically brake the vehicle, the service brake valve can be released at the moment, and if the accelerator is stepped down, the vehicle automatically releases the service brake. And when the set time is reached or the service brake pressure is lower than the set value, the parking brake is automatically switched. The first electromagnetic valve 1 can output air pressure with different sizes according to different duty ratios. When the vehicle is parked automatically, the speed of the vehicle is zero, the first electromagnetic valve 1 is electrified, the air inlet valve is opened, and the air enters the No. 4 control port of the rear axle module 7 and the No. 41 control port of the trailer valve 9 through the second two-way one-way valve 17 of the service braking loop respectively, so that the temporary parking braking of the main vehicle and the trailer is realized, and the automatic parking function is realized. When the vehicle is in neutral gear, the accelerator is stepped on, and the parking brake can not be released automatically. The function is combined with the automatic parking function, and the hill starting function can be realized.
Detecting the braking position of the trailer: the trailer brake position detection function is mainly used for tractor hill-hold capability detection, and the second solenoid valve 14 is arranged at a frame longitudinal beam. During detection, the second electromagnetic valve 14 is powered on through switch control, the air inlet valve of the second electromagnetic valve 14 is opened, compressed air enters the No. 43 control port of the trailer valve 9 through the No. 2 air outlet of the first two-way check valve 13 of the parking loop to release trailer parking braking, at the moment, no air pressure is output from the No. 2 air outlet of the third electromagnetic valve 15, and the tractor achieves parking braking by means of the middle and rear axle diaphragm spring brake air chamber 12. And finishing the trailer position detection function. When the second solenoid valve 14 is de-energized, the second solenoid valve 14 intake valve is closed and the trailer position detection function exits.
Independent braking of the trailer: when the trailer is independently braked, the fourth electromagnetic valve 16 is in an electrified state, and the fourth electromagnetic valve 16 timely adjusts air pressure through switch control, so that the air pressure of the No. 2 air outlet of the trailer is reduced, the air pressure of the No. 43 control port of the trailer valve 9 is dynamically maintained at 4bar air pressure, and further the output air pressure of the No. 22 output port of the trailer valve 9 is 4bar, and the independent braking of the trailer is realized. When the independent braking of the trailer is released, the fourth electromagnetic valve 16 is powered off, the air inlet valves of the fourth electromagnetic valve 16 are all opened, the air pressure of the compressed air at the No. 2 output port of the fourth electromagnetic valve 16 is the same as the air pressure at the No. 1 input port in the morning, and the independent braking of the trailer is released.
Emergency braking: the on-off valve 3 is arranged between the gas storage unit 10 and the third electromagnetic valve 15, and the on-off valve 3 is electrically connected with the control switch. When the vehicle braking system fails, the control switch is pulled up, so that the parking brake is linearly controlled, and the emergency brake of the vehicle is realized. The on-off valve 3 can mechanically realize parking braking through the on-off valve 3 when the vehicle electronic control unit fails.
In summary, the electronic parking brake system for the commercial vehicle provided by the invention controls the corresponding electrical valve to complete the corresponding action response through the electronic control unit ECU according to the specific control strategy to realize the specific function. The system can realize the functions of parking braking and releasing, hill starting, automatic parking, independent braking of the trailer, trailer position detection, emergency braking and the like. The on-off valve has the function that when an electronic control circuit and a control device of the electronic parking system fail, parking can still be carried out from a driving position. The first electromagnetic valve can enable the vehicle to automatically carry out service braking and switch to parking braking under the condition that the condition is met. The second electromagnetic valve is used for detecting whether the independent main vehicle can be stably parked on a slope or not. The third electromagnetic valve has a manual release function, and can manually release or implement the parking brake of the vehicle when the circuit of the vehicle is in failure. The electromagnetic valve has a memory function, can prevent the normally-on capacitor from easily causing the failure of the electromagnetic valve and can ensure that the vehicle cannot automatically implement parking braking if the electromagnetic valve is powered off in a driving state. The fourth electromagnetic valve can realize independent braking and releasing of the trailer.
Electronic parking braking system has many-sided advantage compared in traditional parking system:
(1) the operation is easy: because the system structure taking the electronic circuit as the core is adopted, a driver does not need to directly control mechanical equipment, and only needs to operate an electronic button or other electronic input equipment, so that the system can meet the required control requirement. The operation is simpler and the control is more accurate.
(2) Optimizing cab space: compared with a mechanical mechanism, the electronic structure has higher integration level, and replaces a parking hand valve and a trailer hand valve, so that the cab space is saved. The arrangement is more compact, and the comfort is improved.
(3) The function is stronger greatly: not only have the required basic function of traditional mechanical braking, can provide more intelligent function moreover, bring more succinct operation for driving, have the function of preventing forgetting the parking simultaneously, use the car safer.
The foregoing is merely a preferred embodiment of this invention, which is intended to be illustrative, and not limiting. The structure, the connection mode and the like of all the components in the invention can be changed, and the equivalent transformation and the improvement on the basis of the technical scheme of the invention are not excluded from the protection scope of the invention.
Claims (10)
1. An electronic parking brake system of a commercial vehicle comprises an Electronic Control Unit (ECU), a gas storage unit (10), a rear axle module (7), a trailer valve (9), a middle rear axle diaphragm spring brake chamber (12), and is characterized by further comprising a control switch, a first electromagnetic valve (1), a second electromagnetic valve (14), a third electromagnetic valve (15) and a fourth electromagnetic valve (16);
the gas storage unit (10) is respectively connected with gas circuits of a first electromagnetic valve (1), a second electromagnetic valve (14), a third electromagnetic valve (15) and a fourth electromagnetic valve (16);
the first electromagnetic valve (1) is electrically connected with the Electronic Control Unit (ECU), the first electromagnetic valve (1) is respectively connected with the air passages of a trailer valve (9) and a rear axle module (7), and the rear axle module (7) is connected with the air passage of a middle rear axle diaphragm spring brake air chamber (12);
the second electromagnetic valve (14) is electrically connected with the control switch, and the second electromagnetic valve (14) is connected with the air passage of the trailer valve (9);
the third electromagnetic valve (15) is electrically connected with the control switch, and the third electromagnetic valve (15) is respectively connected with the air passages of the middle rear axle diaphragm spring brake air chamber (12) and the trailer valve (9);
the fourth electromagnetic valve (16) is electrically connected with the control switch, and the fourth electromagnetic valve (16) is connected with the air passage of the trailer valve (9).
2. The commercial vehicle electronic parking brake system according to claim 1, wherein when the Electronic Control Unit (ECU) determines that the automatic parking condition is satisfied, the first electromagnetic valve (1) is controlled to be energized, and an air outlet of the first electromagnetic valve (1) inputs air pressure to a control port No. 4 of the rear axle module (7) and a control port No. 41 of the trailer valve (9), so that short-time parking brake of the main vehicle and the trailer is realized, and an automatic parking function is realized.
3. The electronic parking brake system for commercial vehicle as claimed in claim 2, wherein said first solenoid valve (1) can output air pressure with different magnitude according to different duty ratio; when the vehicle is parked automatically, the speed of the vehicle is zero.
4. A commercial vehicle electronic parking brake system according to claim 1, characterized in that the second solenoid valve (14) is used to implement trailer position detection function; during detection, the second electromagnetic valve (14) is electrified under the control of the control switch, then the second electromagnetic valve (14) inputs compressed air into a No. 43 control port of a trailer valve (9) to release the parking brake of the trailer, at the moment, no air pressure is output from an air outlet of a third electromagnetic valve (15), and the parking brake of the trailer is realized by the aid of a middle and rear axle diaphragm spring brake air chamber (12); and when the second electromagnetic valve (14) is powered off, the trailer position detection is quitted.
5. A commercial vehicle electronic parking brake system according to claim 4, characterized in that the second solenoid valve (14) is arranged at the frame rail.
6. A commercial vehicle electronic parking brake system according to claim 1, characterised in that said third solenoid valve (15) is adapted to manually effect parking braking and release;
when parking and braking are carried out, no air pressure is output from an air outlet of the third electromagnetic valve (15) by operating the control switch, at the moment, no air pressure exists in a parking pipeline, the main vehicle realizes parking under the action of a middle and rear axle diaphragm spring brake air chamber (12), and meanwhile, the air pressure of a No. 43 control port of the trailer valve (9) is zero, so that the trailer is braked;
when the parking brake is released, the air pressure output is made to the air outlet of the third electromagnetic valve (15) by operating the control switch, so that the compressed air enters the spring brake cylinder parking cavity of the diaphragm spring brake air chamber (12) of the middle and rear axles to release the parking brake of the main trailer, and simultaneously the compressed air enters the No. 43 control port of the trailer valve (9), so that the pressure of the trailer control pipeline is released to release the trailer brake.
7. A commercial vehicle electronic parking brake system according to claim 6, characterized in that the third solenoid valve (15) is arranged at the frame rail, the third solenoid valve (15) has a manual release function, and the parking or release of the parking brake of the vehicle can be manually realized when the vehicle circuit is in failure; the third electromagnetic valve (15) has a memory function, can prevent the failure of the electromagnetic valve caused by normal open, and can ensure that the vehicle cannot automatically implement parking braking if the electromagnetic valve is powered off in a driving state.
8. A commercial vehicle electronic parking brake system according to claim 1, characterised in that the fourth solenoid valve (16) is used to effect trailer independent braking and release;
when the trailer is independently braked, the fourth electromagnetic valve (16) is in an electrified state, and the fourth electromagnetic valve (16) timely adjusts air pressure by operating a control switch, so that the air pressure at an air outlet of the fourth electromagnetic valve is reduced to 4bar, the air pressure at a No. 43 control port of the trailer valve (9) is dynamically maintained at 4bar, the output air pressure at a No. 22 output port of the trailer valve (9) is controlled to be 4bar, and the independent brake of the trailer is realized;
when the independent brake of the trailer is released, the fourth electromagnetic valve (16) is powered off, and the air inlet valves of the fourth electromagnetic valve (16) are all opened, so that the air pressure of the output port and the air pressure of the input port of the fourth electromagnetic valve (16) are the same, and the independent brake of the trailer is released.
9. An electric parking brake system for a commercial vehicle according to claim 2, further comprising an on-off valve (3),
the on-off valve (3) is connected with the gas storage unit (10) and the gas circuit of the third electromagnetic valve (15);
the on-off valve (3) has the function that when an electronic control circuit and a control device of the electronic parking system fail, the control switch can still be operated to park.
10. A commercial vehicle comprising an electronic parking brake system according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010254453.2A CN113492814A (en) | 2020-04-02 | 2020-04-02 | Commercial vehicle and electronic parking braking system thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010254453.2A CN113492814A (en) | 2020-04-02 | 2020-04-02 | Commercial vehicle and electronic parking braking system thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114526300A (en) * | 2022-02-25 | 2022-05-24 | 中信戴卡股份有限公司 | Unidirectional automatic pneumatic system braking device |
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| CN203592979U (en) * | 2013-12-17 | 2014-05-14 | 陕西重型汽车有限公司 | Pneumatic brake system of truck |
| CN104494591A (en) * | 2014-12-23 | 2015-04-08 | 安徽安凯汽车股份有限公司 | Electronic parking control system of electric motor coach and control method of electronic parking control system |
| CN205292608U (en) * | 2016-01-21 | 2016-06-08 | 陕西重型汽车有限公司 | Automatic parking braking system of heavy vehicle based on air pressure brake |
| DE102018120350A1 (en) * | 2018-08-21 | 2020-02-27 | Wabco Gmbh | Electropneumatic parking brake arrangement with shut-off valve |
| CN109484383A (en) * | 2018-11-13 | 2019-03-19 | 北汽福田汽车股份有限公司 | Electronic parking and uphill starting control system and vehicle |
| CN209600476U (en) * | 2019-02-21 | 2019-11-08 | 武汉辅安科技有限公司 | A kind of commercial vehicle electronic parking system having failure automatic braking function |
| CN210133104U (en) * | 2019-04-19 | 2020-03-10 | 南京金龙客车制造有限公司 | Simple electronic parking control system for pneumatic braking commercial vehicle |
| CN110816502A (en) * | 2019-11-22 | 2020-02-21 | 浙江万安科技股份有限公司 | Intelligent parking EPB valve system, EPB valve assembly and intelligent parking control method for commercial vehicle |
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| CN114526300A (en) * | 2022-02-25 | 2022-05-24 | 中信戴卡股份有限公司 | Unidirectional automatic pneumatic system braking device |
| CN114526300B (en) * | 2022-02-25 | 2024-04-26 | 中信戴卡股份有限公司 | Unidirectional automatic pneumatic system braking device |
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Application publication date: 20211012 |