CN109594607B - Excavator walking hydraulic pump fault detection method and excavator - Google Patents
Excavator walking hydraulic pump fault detection method and excavator Download PDFInfo
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- CN109594607B CN109594607B CN201811543162.4A CN201811543162A CN109594607B CN 109594607 B CN109594607 B CN 109594607B CN 201811543162 A CN201811543162 A CN 201811543162A CN 109594607 B CN109594607 B CN 109594607B
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- hydraulic pump
- excavator
- walking hydraulic
- preset
- oil pressure
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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
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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
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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
- E02F9/26—Indicating devices
Abstract
The invention relates to the field of engineering machinery, and discloses a fault detection method for a walking hydraulic pump of an excavator and the excavator, wherein the method comprises the following steps: controlling the excavator to work under a specified working condition, and acquiring the actual output oil pressure of the walking hydraulic pump to be tested under the specified working condition; and comparing the difference value between the theoretical output oil pressure and the actual output oil pressure under the specified working condition with a preset difference value, and if the difference value is more than or equal to the preset difference value, determining that the walking hydraulic pump to be detected has a fault of lower working efficiency. According to the invention, whether the efficiency of the walking hydraulic pump is low or not is judged through the change of the output oil pressure of the walking hydraulic pump under the specified working condition, whether the walking hydraulic pump has a fault of low working efficiency or not is confirmed, the working efficiency of the hydraulic pump can be accurately judged, and the walking hydraulic pump is effectively prevented from being permanently damaged; and a flow sensor is not required to be additionally arranged, so that the cost of the excavator is not increased.
Description
Technical Field
The invention relates to the field of engineering machinery, in particular to a fault detection method for a walking hydraulic pump of an excavator and the excavator.
Background
In the existing excavator electric control system, sensors mainly comprise a pilot output oil pressure sensor for controlling a handle, a high-pressure sensor for a traveling hydraulic pump, and a flow sensor for measuring the flow of the traveling hydraulic pump and a swing angle sensor for measuring the swing angle of a swash plate of the traveling hydraulic pump, so that the flow change condition of the traveling hydraulic pump is difficult to monitor intuitively, and the flow of the traveling hydraulic pump directly influences the working efficiency of the traveling hydraulic pump. If the walking hydraulic pump is worn, stuck or leaked, the flow of the walking hydraulic pump is reduced, the working efficiency is reduced, and a serious person can cause the walking hydraulic pump to be damaged and cannot work.
Therefore, a novel method for detecting faults of a traveling hydraulic pump of an excavator and the excavator are needed to solve the above problems.
Disclosure of Invention
The invention aims to provide a fault detection method for a walking hydraulic pump of an excavator and the excavator, which can solve the problem that the working efficiency of the walking hydraulic pump is reduced because the flow of the walking hydraulic pump cannot be measured due to the fact that a flow sensor is not installed in an existing excavator electric control system.
In order to achieve the purpose, the invention adopts the following technical scheme:
a fault detection method for a walking hydraulic pump of an excavator comprises the following steps:
controlling the excavator to work under a specified working condition, and acquiring the actual output oil pressure of the walking hydraulic pump to be tested under the specified working condition;
and comparing the difference value between the theoretical output oil pressure and the actual output oil pressure under the specified working condition with a preset difference value, and if the difference value is more than or equal to the preset difference value, determining that the walking hydraulic pump to be tested has a fault of lower working efficiency.
As an optimal technical scheme of the method for detecting the fault of the excavator walking hydraulic pump, the specified working condition refers to that the excavator is set to a preset gear, and an accelerator pedal of an oil path where the walking hydraulic pump to be detected is located is controlled to work at a preset accelerator opening.
As an optimal technical scheme of the method for detecting the fault of the walking hydraulic pump of the excavator, if the difference is smaller than the preset difference, the walking hydraulic pump to be detected is normal.
As a preferred technical solution of the method for detecting the fault of the traveling hydraulic pump of the excavator, before the step of controlling the excavator to work under the specified working condition, the input currents of all the traveling hydraulic pumps of the excavator are set to be zero;
after the step of controlling the excavator to work under the specified working condition, the walking hydraulic pump to be tested is controlled to work at the preset current.
As an optimal technical scheme of the method for detecting the fault of the walking hydraulic pump of the excavator, the step of controlling the walking hydraulic pump to be detected to work at a preset current comprises the following steps:
and setting the input current of the walking hydraulic pump to be tested as a preset current, and waiting for a preset time.
As an optimal technical scheme of the fault detection method for the walking hydraulic pump of the excavator, when the walking hydraulic pump to be detected works at the preset current, the displacement of the walking hydraulic pump to be detected is the largest.
As a preferred technical solution of the method for detecting a fault of a traveling hydraulic pump of an excavator, before the step of controlling an accelerator pedal of an oil path where the traveling hydraulic pump to be detected is located to operate at a preset accelerator opening degree, a crawler driven by the traveling hydraulic pump to be detected is suspended.
As an optimal technical scheme of the fault detection method for the excavator walking hydraulic pump, the preset gear is the highest gear, and the preset accelerator opening is the maximum accelerator opening.
As an optimal technical solution of the method for detecting a fault of a traveling hydraulic pump of an excavator, the step of comparing a difference between a theoretical output oil pressure and an actual output oil pressure of the traveling hydraulic pump to be detected with a preset difference includes:
measuring the actual output oil pressure of the walking hydraulic pump to be measured under the specified working condition for multiple times, and calculating an average value;
and comparing the difference value between the theoretical output oil pressure of the walking hydraulic pump to be detected under the specified working condition and the average value.
In order to achieve the purpose, the invention further provides an excavator, wherein the excavator is provided with a fault detection switch, and whether the fault of the working efficiency of the walking hydraulic pump of the excavator is low or not is detected by adopting the method for detecting the fault of the walking hydraulic pump of the excavator.
The invention has the beneficial effects that: according to the invention, whether the efficiency of the walking hydraulic pump is low or not is judged through the change of the output oil pressure of the walking hydraulic pump under the specified working condition, and then whether the walking hydraulic pump has a fault of low working efficiency or not is confirmed, so that the working efficiency of the hydraulic pump can be accurately judged, and the walking hydraulic pump is effectively prevented from being permanently damaged; and a flow sensor is not required to be additionally arranged, so that the cost of the excavator is not increased.
Drawings
Fig. 1 is a flowchart of a fault detection method for a walking hydraulic pump of an excavator according to an embodiment of the present invention.
Detailed Description
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
The embodiment provides an excavator, wherein a fault detection switch is arranged on the excavator, the fault detection switch is arranged in a cab of the excavator and used for quickly starting an excavator fault detection function, and the fault detection switch can be a button, a knob, a handle and the like.
The embodiment also provides a fault detection method for the walking hydraulic pump of the excavator, the output oil pressure change of the walking hydraulic pump is monitored through an output oil pressure sensor arranged on the existing walking hydraulic pump of the excavator, and because the corresponding relation exists between the output oil pressure of the walking hydraulic pump under the specified working condition and the output flow of the pump, whether the walking hydraulic pump has a fault with low efficiency or not can be judged through the output oil pressure change of the walking hydraulic pump under the specified working condition.
The appointed working condition refers to that the excavator is set to a preset gear, and an accelerator pedal of an oil path where the walking hydraulic pump to be detected is controlled to work at a preset accelerator opening degree.
The excavator has a plurality of walking hydraulic pumps, and carry out fault detection to every walking hydraulic pump respectively, and the walking hydraulic pump of excavator in this embodiment is variable pump and has two, is the left side walking hydraulic pump and the right side walking hydraulic pump respectively, and the measurement process of two walking hydraulic pumps is the exact same. Fig. 1 is a flowchart of a method for detecting a failure of an excavator traveling hydraulic pump according to the present embodiment, and the method for detecting a failure will be described in detail below with reference to fig. 1 by taking an example of a flow for detecting a failure of an excavator left traveling hydraulic pump.
And S10, starting a fault detection function of the excavator.
The fault detection function of the excavator is started by pressing a button, rotating a knob or operating a handle and the like.
And S20, setting the input current of all the walking hydraulic pumps of the excavator to be zero.
Namely, the input current of the left hydraulic pump and the right hydraulic pump of the excavator is set to be zero. The input current of the variable pump is in direct proportion to the displacement of the variable pump, and when the input current of the walking hydraulic pump is zero, the displacement of the walking hydraulic pump is zero.
S30, setting the excavator to a preset gear, controlling a left crawler of the excavator to suspend in the air, controlling an accelerator pedal of an oil path where the left walking hydraulic pump is located to work at a preset accelerator opening degree, and then controlling the left walking hydraulic pump to work at a preset current; and after waiting for the preset time, acquiring the actual output oil pressure of the walking hydraulic pump to be detected under the specified working condition.
The preset gear is the highest gear, the preset accelerator opening is the maximum accelerator opening, and the purpose that the left side crawler of the excavator is suspended is to avoid the influence of friction force between the crawler and the ground on a measurement result. When the left-side walking hydraulic pump works at a preset current, the displacement of the left-side walking hydraulic pump is the maximum.
The purpose of setting the preset time is to obtain the actual output oil pressure of the walking hydraulic pump after the displacement is stable so as to improve the accuracy of the measurement result.
And S40, measuring the actual output oil pressure of the walking hydraulic pump to be measured under the specified working condition for multiple times, and calculating the average value.
The actual output oil pressure may be measured one at a time by repeating steps S20 to S30; after step S30, a plurality of actual output oil pressures may be directly measured.
S50, obtaining theoretical output oil pressure under the appointed working condition, judging whether the difference value between the theoretical output oil pressure and the average value is larger than or equal to a preset difference value, if so, executing S60; if not, S70 is executed.
The above theoretical output oil pressure is a known value, and the theoretical output oil pressure of the normal travel hydraulic pump under the specified condition is obtained by repeating the test a plurality of times according to the methods described in step S20 and step S30.
S60, the left walking hydraulic pump has a fault of low working efficiency.
S70, the left walking hydraulic pump is normal.
The method of detecting a failure of the right-side traveling hydraulic pump is exactly the same as that of the left-side traveling hydraulic pump, and a description thereof will not be repeated.
In the embodiment, when the excavator works at a preset gear and an accelerator pedal of an oil path where a walking hydraulic pump to be detected is located works at a preset accelerator opening, whether the walking hydraulic pump is low in efficiency is judged according to the change of the output oil pressure of the walking hydraulic pump under a specified working condition, and then whether the walking hydraulic pump has a fault of low working efficiency is determined, so that the working efficiency of the hydraulic pump can be accurately judged, and the walking hydraulic pump is effectively prevented from being permanently damaged; and a flow sensor is not required to be additionally arranged, so that the cost of the excavator is not increased.
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 (6)
1. A fault detection method for a walking hydraulic pump of an excavator is characterized by comprising the following steps:
controlling the excavator to work under a specified working condition, and acquiring the actual output oil pressure of the walking hydraulic pump to be tested under the specified working condition;
comparing the difference value between the theoretical output oil pressure and the actual output oil pressure under the specified working condition with a preset difference value, and if the difference value is greater than or equal to the preset difference value, determining that the walking hydraulic pump to be tested has a fault of lower working efficiency;
the specified working condition refers to that the excavator is set to a preset gear, and an accelerator pedal of an oil path where the walking hydraulic pump to be detected is controlled to work at a preset accelerator opening degree; the preset gear is a highest gear, and the preset accelerator opening is a maximum accelerator opening;
after the step of controlling the excavator to work under the specified working condition, controlling the walking hydraulic pump to be tested to work at a preset current, wherein when the walking hydraulic pump to be tested works at the preset current, the displacement of the walking hydraulic pump to be tested is the largest;
and suspending the crawler driven by the walking hydraulic pump to be tested in the air before the step of controlling the accelerator pedal of the oil path where the walking hydraulic pump to be tested is located to work at the preset accelerator opening.
2. The method for detecting the fault of the walking hydraulic pump of the excavator as claimed in claim 1, wherein if the difference is smaller than the preset difference, the walking hydraulic pump to be detected is normal.
3. The method for detecting the fault of the traveling hydraulic pump of the excavator according to claim 1, wherein the input current of all the traveling hydraulic pumps of the excavator is set to zero before the step of controlling the excavator to operate under the specified working condition.
4. The method for detecting the fault of the traveling hydraulic pump of the excavator according to claim 3, wherein the step of controlling the traveling hydraulic pump to be tested to operate at the preset current comprises:
and setting the input current of the walking hydraulic pump to be tested as a preset current, and waiting for a preset time.
5. The method for detecting a malfunction of an excavator walking hydraulic pump according to any one of claims 1 to 4, wherein the step of comparing the magnitude of the difference between the theoretical output oil pressure and the actual output oil pressure of the walking hydraulic pump to be measured with a preset difference comprises:
measuring the actual output oil pressure of the walking hydraulic pump to be measured under the specified working condition for multiple times, and calculating an average value;
and comparing the difference value between the theoretical output oil pressure of the walking hydraulic pump to be detected under the specified working condition and the average value.
6. An excavator, characterized in that the excavator is provided with a fault detection switch for starting a fault detection function, and the method for detecting the fault of the walking hydraulic pump of the excavator according to any one of claims 1 to 5 is adopted to detect whether the walking hydraulic pump of the excavator has a fault with low working efficiency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811543162.4A CN109594607B (en) | 2018-12-17 | 2018-12-17 | Excavator walking hydraulic pump fault detection method and excavator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811543162.4A CN109594607B (en) | 2018-12-17 | 2018-12-17 | Excavator walking hydraulic pump fault detection method and excavator |
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| Publication Number | Publication Date |
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| CN109594607A CN109594607A (en) | 2019-04-09 |
| CN109594607B true CN109594607B (en) | 2022-01-21 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3652062B2 (en) * | 1997-04-15 | 2005-05-25 | 日立建機株式会社 | Automatic excavation load measuring device for blasting ground |
| JP5220917B2 (en) * | 2009-03-24 | 2013-06-26 | 日立建機株式会社 | Anomaly detector for construction machinery |
| US9797111B2 (en) * | 2014-09-10 | 2017-10-24 | Komatsu Ltd. | Work vehicle |
| JP6324347B2 (en) * | 2015-06-01 | 2018-05-16 | 日立建機株式会社 | Hydraulic control equipment for construction machinery |
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