CN110356376B - Parking brake control method and excavator - Google Patents
Parking brake control method and excavator Download PDFInfo
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- CN110356376B CN110356376B CN201910578480.2A CN201910578480A CN110356376B CN 110356376 B CN110356376 B CN 110356376B CN 201910578480 A CN201910578480 A CN 201910578480A CN 110356376 B CN110356376 B CN 110356376B
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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
- B60T7/00—Brake-action initiating means
- B60T7/12—Brake-action initiating means for automatic initiation; for initiation not subject to will of driver or passenger
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/2058—Electric or electro-mechanical or mechanical control devices of vehicle sub-units
- E02F9/2083—Control of vehicle braking systems
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Operation Control Of Excavators (AREA)
- Braking Systems And Boosters (AREA)
Abstract
The invention provides a parking brake control method and an excavator, wherein the method is applied to the excavator, the excavator comprises a controller, an engine, a brake switch, a hydraulic device and a brake device, the hydraulic device is connected with the brake device, the hydraulic device comprises an electromagnetic valve, and the brake switch, the electromagnetic valve and the engine are all connected with the controller, the method comprises the following steps: the controller detects whether the engine is started; if the brake device is not started, the controller controls the electromagnetic valve to be closed so as to enable the brake device to park and brake; if the brake switch is started, the controller detects the state of the brake switch and controls the electromagnetic valve to be opened according to the pressing state of the brake switch, so that the hydraulic device releases braking of the brake device. According to the technical scheme of the invention, the brake can be prevented from being accidentally released due to various misoperation before the excavator is started, and the parking brake is automatically implemented after the power failure, so that the safety of the parking brake is improved.
Description
Technical Field
The invention relates to the technical field of engineering machinery, in particular to a parking brake control method and an excavator.
Background
The parking brake of backhoe loaders and other wheeled work machines is a necessary safety device. At present, the most common parking brake is a mechanical brake composed of a brake clamp, a flexible shaft, a proximity sensor and the like. When parking, an operator pulls the brake clamp through the flexible shaft to apply manual braking, and the brake method has the problems of inconvenient operation or easy forgetting of manual braking.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a parking brake control method and an excavator, which can automatically implement a parking brake after a power failure occurs during a parking operation, and allow the parking brake to be released only when a certain condition is satisfied, thereby improving parking safety.
The embodiment of the invention provides a parking brake control method, which is applied to an excavator, wherein the excavator comprises a controller, an engine, a brake switch, a hydraulic device and a brake device, the hydraulic device is connected with the brake device, the hydraulic device comprises an electromagnetic valve, and the brake switch, the electromagnetic valve and the engine are all connected with the controller, and the method comprises the following steps:
the controller detects whether the engine has started;
if the brake device is not started, the controller controls the electromagnetic valve to be closed so as to enable the brake device to park and brake;
if the brake switch is started, the controller detects the state of the brake switch and controls the electromagnetic valve to be opened according to the pressing state of the brake switch, so that the hydraulic device releases the brake of the brake device.
Further, in the parking brake control method, the controller may detect the state of the brake switch by detecting the number of times of the change signal corresponding to the depression and/or rebound of the brake switch.
Further, in the parking brake control method, the method further includes:
and if the change signals are detected twice or more than twice within the preset time, the controller controls the electromagnetic valve to be closed.
Further, in the parking brake control method, the controller maintains the closed state of the electromagnetic valve when a pressed state of the brake switch is detected if the engine is not started.
Further, in the above-described parking brake control method, the brake device includes a spring member and a brake caliper, the spring member being connected to the brake caliper by a link,
when the electromagnetic valve is opened, the spring piece is compressed by the hydraulic device, so that the brake clamp releases the brake;
when the solenoid valve is closed, the spring member is restored by the hydraulic device, so that the brake clamp can park and brake.
Further, in the parking brake control method, the method further includes:
and if the engine is not started, the controller detects the compression state of the spring part and sends out an alarm signal when the stress value of the spring part reaches a preset threshold value.
Further, in the parking brake control method, the method further includes:
and if the engine is detected to be started and the brake switch is not detected to be pressed down within the preset time, the controller sends a brake release prompt signal.
Further, in the parking brake control method, the brake switch is an elastic button, a foot pedal or a handle.
Another embodiment of the present invention further provides an excavator, including: the hydraulic device is connected with the braking device and comprises an electromagnetic valve, and the braking switch, the electromagnetic valve and the engine are all connected with the controller;
the controller is used for detecting whether the engine is started;
if the brake device is not started, the controller is also used for controlling the electromagnetic valve to be closed so as to enable the brake device to park and brake;
if the brake switch is started, the controller is also used for detecting the state of the brake switch and controlling the electromagnetic valve to be opened according to the pressing state of the brake switch so that the hydraulic device releases the brake of the brake device.
Further, in the excavator above, the braking device comprises a spring member and a braking clamp, the spring member is connected with the braking clamp through a connecting rod;
when the electromagnetic valve is opened, the spring piece is compressed by the hydraulic device, so that the brake clamp releases the brake;
when the solenoid valve is closed, the spring member is restored by the hydraulic device, so that the brake clamp can park and brake.
The embodiment of the invention has the following advantages:
the safety of the parking brake is improved by pushing the spring part in the brake device by the hydraulic device to release the brake only after the machine is started, so that the dangerous situation that the brake is accidentally released due to various misoperation can be avoided before the machine is started, and the parking brake is automatically implemented after the machine is not started or is powered off.
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible and comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic structural diagram illustrating a parking brake of an excavator according to an embodiment of the present invention;
FIG. 2 is a first flowchart illustrating a parking brake control method according to an embodiment of the present invention;
fig. 3 shows a second flowchart of a parking brake control method according to an embodiment of the invention.
Description of the main element symbols:
1-an excavator; 10-a controller; 11-an engine; 12-a brake switch;
13-hydraulic means; 131-a solenoid valve; 14-a braking device; 141-spring elements; 142-brake caliper.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
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; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
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 one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the templates herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Example 1
Referring to fig. 1, the present embodiment provides a parking brake control method, which can be applied to a wheel type construction machinery vehicle such as an excavator, etc., and can solve the problem that the existing excavator only needs to manually implement parking brake, etc., by using a hydraulic pressure and a brake switch to implement parking brake and brake release, etc. The parking brake control method will be described in detail below.
In the present embodiment, the parking brake control method can be applied to the excavator 1 shown in fig. 1. Specifically, as shown in fig. 1, the excavator 1 includes a controller 10, an engine 11, a brake switch 12, a hydraulic device 13, and a brake device 14. Wherein the hydraulic device 13 is connected to the brake device 14, and the hydraulic device 13 comprises a solenoid valve 131, and the solenoid valve 131, the brake switch 12 and the engine 11 are all connected to the controller 10.
The hydraulic device 13 uses hydraulic oil as working medium for transferring energy, such as various mineral oil, emulsion, synthetic hydraulic oil, etc. The electromagnetic valve 131 is mainly used for controlling and regulating the pressure, flow rate, direction, etc. of the hydraulic oil in the hydraulic device 13. Furthermore, a hydraulic line is provided between the hydraulic device 13 and the brake device 14, by means of which a corresponding action on the brake device 14 can be achieved.
In this embodiment, the braking device 14 includes a spring member 141 and a braking clamp 142, the spring member 141 is connected to the braking clamp 142 through a connecting rod, and the braking clamp 142 is used for locking the brake wheel under the pushing force of the connecting rod, so as to achieve the purpose of parking braking.
It will be appreciated that when the solenoid 131 is opened, hydraulic fluid will compress the spring 141 in the brake device 14 along the hydraulic line, causing the brake caliper 142 to release the brake wheel as the links move outwardly, thereby releasing the parking brake. Conversely, when the solenoid valve 131 is opened, the hydraulic oil will return to the hydraulic cylinder of the hydraulic device 13 along the hydraulic line, and the spring member 141 will automatically return from the compressed state, so that the braking clamp 142 will apply the brake to the braking wheel again.
The brake switch 12 may be an automatically resettable resilient switch, such as a resilient button, foot pedal or handle, or the like. As shown in fig. 1, the brake switch 12 is electrically connected to the controller 10, so that when the brake switch 12 is pressed, the controller 10 will detect a corresponding switch signal.
With the above-described main components, it is possible to realize the automatic parking brake of the excavator 1 in a non-operating state such as after power-off, and to allow the manual release of the parking brake only after the excavator 1 is started, thereby improving the parking brake safety of the excavator 1, and the like.
As shown in fig. 2, the parking brake control method mainly includes the following steps:
in step S10, it is detected whether the engine 11 has been started.
In the above step S10, the controller 10 determines whether the brake should be released by detecting whether the engine 11 is started. If the excavator 1 is in the activated state, step S30 is executed, otherwise, step S20 is executed.
In step S20, the solenoid valve 131 of the hydraulic pressure device 13 is controlled to close, and the brake device 14 applies the parking brake.
In step S20, the controller 10 controls the solenoid valve 131 of the hydraulic device 13 to be in the closed state when the engine 11 is not started. Also, since the engine 11 is not started, the hydraulic device 13 cannot output the hydraulic oil source, so that the hydraulic device 13 cannot act on the spring member 141 in the brake device 14. At this time, the spring member 141 in the braking device 14 will recover its original shape due to the shutdown operation or the power-off operation, and then the braking clamp 142 will lock the braking wheel, so as to implement the automatic parking braking during the shutdown or the power-off, thus the operator does not need to perform the manual parking braking during the shutdown at every time, and the phenomenon that the existing excavator often forgets the manual braking will not occur, and the safety can be improved.
Further, after the step S10, the method further includes: if the engine 11 is not started, the controller 10 maintains the closed state of the electromagnetic valve 131 if the pressed state of the brake switch 12 is detected. This ensures that release of the parking brake is only allowed when the excavator 1 is started, otherwise the braking state will be maintained.
Further, the method further comprises: when the engine 11 is not started, the controller 10 detects the compression state of the spring member 141 in the braking device 14, and sends out an alarm signal when detecting that the stress value of the spring member 141 reaches a preset threshold value, so that an operator can be reminded that the excavator 1 may be forcibly braked, and the operator can timely inform the excavator to process the stress value and avoid larger potential safety hazards and the like. The preset threshold may be selected according to a pressure value required for braking, and the like.
In step S30, the pressed state of the brake switch 12 is detected.
In the above step S30, when the engine 11 is started, the controller 10 detects the state of the brake switch 12 and controls whether the electromagnetic valve 131 is opened or not according to the state of the brake switch 12. Further alternatively, if it is detected that the engine 11 has been started and the pressing of the brake switch 12 is not detected within a preset time, the controller 10 will issue a brake release prompt signal and notify an operator of a manual brake release operation.
Considering that the existing parking brake mode not only needs to manually implement parking brake, but also has a holding function, namely the existing parking brake hand brake is kept in an off state as long as being pulled up, and is kept in an on state as long as being put down, therefore, if the hand brake is forgotten to be implemented after shutdown, the excavator can directly start to walk when starting the excavator next time, and at the moment, an operator may not timely react to cause potential safety hazard. On the contrary, if manual braking is implemented after shutdown, the brake is forgotten to be timely released when the vehicle is started next time, and forced driving can cause the phenomena of rapid abrasion of the friction plate and the like, thereby causing irreversible damage.
Therefore, in this embodiment, the brake switch 12 is an automatically resettable elastic switch, such as an elastic button, a foot pedal or a handle, etc. This avoids the above-mentioned prior art brake handbrake remaining in an off or closed condition at all times. Further, the controller 10 will detect the state of the brake switch 12 by detecting the number of times the corresponding change signal is pressed and/or bounced back by the brake switch 12. For example, the detected level change from high level to low level, or from low level to high level, or from high level to low level and then from low level to high level, or from low level to high level and then from high level to low level can be used as a corresponding change signal when the brake switch 12 is detected to be pressed. For example, after the engine 11 is started, if the change signal is detected once, it is determined that the brake switch 12 is pressed, and at this time, step S40 is executed.
In the above step S30, optionally, as shown in fig. 3, the method further includes a step S301 of determining whether to connect the change signal detected twice or more than twice. If so, the controller 10 determines that the operation is an ineffective operation, and then the closed state of the solenoid valve 131 is maintained, and the parking brake state of the excavator is maintained, that is, step S20 is executed. If not, step S40 is executed.
In step S40, the solenoid valve 131 of the hydraulic device 13 is controlled to open, and the brake is released from the brake device 14.
In step S40, when the depression of the brake switch 12 is detected after the engine 11 is started, the controller 10 controls the solenoid valve 131 of the hydraulic device 13 to be in the open state. At this time, the hydraulic device 13 will output a hydraulic oil source and act on the spring member 141 in the brake device 14 through a hydraulic line. The spring 141 in the brake device 14 will then be compressed under hydraulic pressure, so that the brake caliper 142 will release the brake wheel, thereby releasing the parking brake.
According to the parking brake control method, the opening signal of the electromagnetic valve of the hydraulic device is given only after the machine is started and according to the pressing state of the brake switch, so that parking brake of the brake device is relieved, the dangerous situation that the brake is accidentally relieved due to various misoperation before the machine is started can be avoided, and the parking brake is automatically implemented after the machine is not started or is powered off, so that the safety of the parking brake is improved.
Example 2
Referring to fig. 1, the present embodiment provides an excavator, which can implement parking braking and brake release by using the parking brake control method in embodiment 1.
Exemplarily, as shown in fig. 1, the excavator includes: a controller 10, an engine 11, a brake switch 12, a hydraulic device 13 and a brake device 14. Wherein the hydraulic device 13 is connected to the brake device 14, and the hydraulic device 13 comprises a solenoid valve 131, and the solenoid valve 131, the brake switch 12 and the engine 11 are all connected to the controller 10.
Wherein the controller 10 is adapted to detect whether the engine 11 has been started.
If not, the controller 10 is configured to control the solenoid valve 131 to close to park the brake device 14.
If activated, the controller 10 is configured to detect a state of the brake switch 12, and control the solenoid valve 131 to open according to a pressed state of the brake switch 12, so that the hydraulic device 13 releases the brake of the brake device 14.
In this embodiment, the braking device 14 includes a spring member 141 and a braking clamp 142, the spring member 141 is connected to the braking clamp 142 through a connecting rod, and the braking clamp 142 is used for locking the braking wheel under the pushing force of the connecting rod to achieve the braking purpose.
It will be appreciated that when the solenoid valve 131 is opened, the hydraulic fluid will compress the spring member 141 in the brake device 14 along the hydraulic line, and the link moves outward, so that the brake caliper 142 releases the brake wheel, thereby releasing the brake. Conversely, when the solenoid valve 131 is opened, the hydraulic oil will return to the hydraulic cylinder of the hydraulic device 13 along the hydraulic line, and the spring member 141 will automatically return from the compressed state, so that the braking clamp 142 will apply the brake to the braking wheel again.
It is understood that the excavator of the present embodiment corresponds to the method of embodiment 1, and the alternatives of embodiment 1 are also applicable to the present embodiment, so that the detailed description is omitted here.
In all examples shown and described herein, any particular value should be construed as merely exemplary, and not as a limitation, and thus other examples of example embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The above examples are merely illustrative of several embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (9)
1. A parking brake control method is applied to an excavator, the excavator comprises a controller, an engine, a brake switch, a hydraulic device and a brake device, the hydraulic device is connected with the brake device, the hydraulic device comprises an electromagnetic valve, and the brake switch, the electromagnetic valve and the engine are all connected with the controller, the method comprises the following steps:
the controller detects whether the engine has started;
if the brake device is not started, the controller controls the electromagnetic valve to be closed so as to enable the brake device to park and brake;
if the brake device is started, the controller detects the state of the brake switch and controls the electromagnetic valve to be opened according to the pressing state of the brake switch, the hydraulic device outputs a hydraulic oil source and acts on a spring part in the brake device through a hydraulic pipeline, and the spring part in the brake device is compressed under the action of hydraulic acting force, so that the brake clamp releases the brake wheel, and the hydraulic device releases the brake on the brake device;
the brake switch is an elastic key, a pedal or a handle.
2. The parking brake control method according to claim 1, wherein the controller detects the state of the brake switch by detecting the number of times of the change signal corresponding to the depression and/or rebound of the brake switch.
3. The parking brake control method according to claim 2, characterized by further comprising:
and if the change signals are detected twice or more than twice within the preset time, the controller controls the electromagnetic valve to be closed.
4. The parking brake control method according to claim 1, characterized by further comprising:
if the engine is not started, when the pressing state of the brake switch is detected, the controller keeps the closing state of the electromagnetic valve.
5. The parking brake control method according to claim 1, wherein the brake device includes a spring member and a brake caliper, the spring member being connected to the brake caliper by a link,
when the electromagnetic valve is opened, the spring piece is compressed by the hydraulic device, so that the brake clamp releases the brake;
when the solenoid valve is closed, the spring member is restored by the hydraulic device, so that the brake clamp can park and brake.
6. The parking brake control method according to claim 5, characterized by further comprising:
if the engine is not started, the controller detects the compression state of the spring part and sends out an alarm signal when detecting that the stress value of the spring part reaches a preset threshold value.
7. The parking brake control method according to claim 1, characterized by further comprising:
and if the engine is detected to be started and the brake switch is not detected to be pressed down within the preset time, the controller sends a brake release prompt signal.
8. An excavator, comprising: the hydraulic device is connected with the braking device and comprises an electromagnetic valve, and the braking switch, the electromagnetic valve and the engine are all connected with the controller;
the controller is used for detecting whether the engine is started;
if the brake device is not started, the controller is also used for controlling the electromagnetic valve to be closed so as to enable the brake device to park and brake;
if the brake device is started, the controller is further used for detecting the state of the brake switch and controlling the electromagnetic valve to be opened according to the pressing state of the brake switch, the hydraulic device outputs a hydraulic oil source and acts on a spring part in the brake device through a hydraulic pipeline, and the spring part in the brake device is compressed under the action of hydraulic acting force, so that the brake clamp releases the brake wheel, and the hydraulic device releases the brake on the brake device;
the brake switch is an elastic key, a pedal or a handle.
9. The excavator of claim 8 wherein the braking device comprises a spring member and a brake clamp, the spring member being connected to the brake clamp by a linkage;
when the electromagnetic valve is opened, the spring piece is compressed by the hydraulic device, so that the brake clamp releases the brake;
when the solenoid valve is closed, the spring member is restored by the hydraulic device, so that the brake clamp can park and brake.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910578480.2A CN110356376B (en) | 2019-06-28 | 2019-06-28 | Parking brake control method and excavator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910578480.2A CN110356376B (en) | 2019-06-28 | 2019-06-28 | Parking brake control method and excavator |
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| CN110356376A CN110356376A (en) | 2019-10-22 |
| CN110356376B true CN110356376B (en) | 2021-01-12 |
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| CN201910578480.2A Active CN110356376B (en) | 2019-06-28 | 2019-06-28 | Parking brake control method and excavator |
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| CN111456145A (en) * | 2020-04-14 | 2020-07-28 | 三一重机有限公司 | Parking protection system and excavator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN202448970U (en) * | 2012-03-09 | 2012-09-26 | 崔晓燕 | Anti-lock device for hydraulic parking brake |
| CN203528470U (en) * | 2013-08-30 | 2014-04-09 | 徐州重型机械有限公司 | Wheeled crane and parking braking system thereof |
| CN103863289B (en) * | 2014-03-28 | 2017-09-19 | 徐州重型机械有限公司 | A kind of vapour-pressure type electric control parking brakes |
| CN106184163B (en) * | 2016-09-13 | 2018-09-04 | 北京汽车研究总院有限公司 | One kind automatically controlling parking braking system and automobile |
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