WO2013023381A1 - Method for distributing hydraulic oil flow of hydraulic system and device thereof - Google Patents

Abstract

Disclosed are a hydraulic oil flow distribution method and a device thereof for hydraulic system. The hydraulic system includes multiple oil passages and an oil pump from which hydraulic oil is supplied to the multiple oil passages. The method includes the following steps of: calculating the hydraulic oil flow supplied by the oil pump by a first hydraulic oil flow calculating device (10), calculating the hydraulic oil flow required for the multiple oil passages by a second hydraulic oil flow calculating device (20), and calculating the ratio between the supplied hydraulic oil flow and the required hydraulic oil flow when the hydraulic oil flow supplied by the oil pump is less than the hydraulic oil flow required for the multiple oil passages, and regarding to each of the multiple oil passages, supplying the hydraulic oil flow which is the product of the oil flow required for the oil passages and the ratio to the passage. By proportionally distributing the hydraulic oil flow to each oil passage, the hydraulic oil flow distributed by the system to each oil passage reduces accordingly. Therefore, though the action of the actuation component corresponding to each oil passage is slow, it is able to coordinate action and complete composite motion.

Description

 Hydraulic oil flow distribution method and device for hydraulic system

 Technical field

 The present invention relates to the field of construction machinery, and in particular to a hydraulic oil flow distribution method and apparatus for a hydraulic system. Background technique

 Currently, hydraulic systems typically include a plurality of oil lines and an oil pump that supplies hydraulic oil to the plurality of oil lines. For example, the pump truck includes a boom pump and a hydraulic motor connected to the boom pump and a plurality of boom cylinders, which can supply hydraulic oil to the hydraulic motor, thereby driving the turntable of the pump truck to rotate, and can give The plurality of boom cylinders provide hydraulic oil to drive the boom connected to the boom cylinder. The faster the boom moves, the greater the hydraulic oil flow required for the boom cylinder connected to the boom; the slower the boom speed, the smaller the hydraulic oil flow required for the boom cylinder connected to the boom.

 However, when operating the boom, if the hydraulic oil flow provided by the boom pump cannot meet the requirements of all booms, that is, the hydraulic oil flow provided is less than the hydraulic oil flow required for all boom operations, it will result in a certain Some boom movements, some of the booms do not have any movements or movements are very slow, which causes the boom movements to be uncoordinated and difficult to reach the operator's desired posture. Summary of the invention

 SUMMARY OF THE INVENTION An object of the present invention is to provide a hydraulic oil flow distribution method and apparatus for a hydraulic system, which can realize a coordinated action of an action element (e.g., a boom, a turntable, etc.) corresponding to an oil passage.

In order to achieve the above object, the present invention provides a hydraulic oil flow distribution method for a hydraulic system, the hydraulic system including a plurality of oil passages and an oil pump for supplying hydraulic oil to the plurality of oil passages, the method comprising: calculating the oil pump Hydraulic oil flow that can be supplied; calculation of the plurality of oil paths required a hydraulic oil flow rate; and calculating a hydraulic oil flow rate that can be provided and the required hydraulic pressure when a hydraulic oil flow rate that the oil pump can provide is less than a hydraulic oil flow rate required by the plurality of oil passages A ratio between the oil flows, and for each of the plurality of oil passages, a hydraulic oil flow rate of the hydraulic oil flow required for the oil passage and the ratio is supplied to the oil passage.

 Accordingly, the present invention also provides a hydraulic oil flow distribution device for a hydraulic system, the hydraulic system including a plurality of oil passages and an oil pump for supplying hydraulic oil to the plurality of oil passages, the device comprising: a first hydraulic oil flow a calculation device for calculating a hydraulic oil flow that the oil pump can provide; a second hydraulic oil flow calculation device for calculating a hydraulic oil flow required for the plurality of oil passages; and a hydraulic oil flow supply device for Calculating a ratio between the hydraulic oil flow rate that can be provided and the required hydraulic oil flow rate when the hydraulic oil flow that the oil pump can provide is less than the hydraulic oil flow rate required by the plurality of oil passages And providing, for each of the plurality of oil passages, a hydraulic oil flow rate of the hydraulic oil flow required by the oil passage and the ratio of the hydraulic oil flow to the oil passage.

 Through the above technical solution, the hydraulic oil flow of each oil passage can be proportionally distributed when the hydraulic oil flow rate that the oil pump can provide is less than the hydraulic oil flow rate required by the plurality of oil passages, so that each oil is distributed to each oil. The hydraulic oil flow rate of the road is correspondingly reduced. Therefore, the action elements (for example, the boom, the turntable, etc.) corresponding to each oil path are slow, but the coordinated action is ensured, and the compound motion is realized.

 Other features and advantages of the invention will be described in detail in the detailed description which follows. DRAWINGS

 The drawings are intended to provide a further understanding of the invention, and are in the In the drawing:

 1 is a flow chart of a method for distributing hydraulic oil flow according to the present invention;

Figure 2 is a graph showing the relationship between the AD value of the steering signal and the current input to the proportional valve; Figure 3 is a graph showing the relationship between the applied current and the I flow when the oil pump displacement is constant;

 4 is a block diagram of a hydraulic oil flow distribution device provided by the present invention. Description of the reference numerals

 10 First hydraulic oil flow calculation device 20 Second hydraulic oil flow calculation device

30 Hydraulic oil flow supply equipment

 The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are intended to be illustrative and not restrictive.

 1 is a flow chart of a hydraulic oil flow distribution method provided by the present invention. As shown in FIG. 1, the present invention provides a hydraulic oil flow distribution method for a hydraulic system, the hydraulic system including a plurality of oil passages and an oil pump for supplying hydraulic oil to the plurality of oil passages, the method comprising: Describe the hydraulic oil flow that the oil pump can provide; calculate the hydraulic oil flow required for the plurality of oil passages; and the hydraulic oil flow rate that the oil pump can provide is less than the hydraulic oil flow required for the plurality of oil passages Calculating a ratio between the hydraulic oil flow that can be provided and the required hydraulic oil flow, and providing hydraulic oil flow required for the oil passage for each of the plurality of oil passages The hydraulic oil with the product of the ratio flows to the oil passage.

 The plurality of oil passages may include: an oil passage of the oil pump to the hydraulic motor and an oil passage of the oil pump to the at least one boom cylinder; or an oil passage of the oil pump to at least two boom cylinders. Of course, the present invention is not limited to the above, and the plurality of oil passages may be oil passages in a hydraulic system in other construction machinery vehicles (such as cranes, excavators, etc.).

Wherein, the hydraulic oil flow rate that the oil pump can provide is calculated by the following formula: q = V χ η χ η _ν , Wherein, the hydraulic oil flow that can be provided by the oil pump is the geometric displacement per revolution of the oil pump, and M is the rotational speed of the oil pump, which is the volumetric efficiency of the oil pump.

 In general, the hydraulic system includes a plurality of handles corresponding to the plurality of oil passages for controlling the amount of hydraulic oil in the oil passage, thereby controlling the movement of the action elements corresponding to the oil passages. speed. For mechanical engineering devices (eg, pump trucks, cranes, excavators, etc.), the plurality of handles can be located in the cab or on the remote control of the pump truck. The calculating the hydraulic oil flow required for the plurality of oil passages may include the steps of: acquiring, for each handle of the plurality of handles corresponding to the plurality of oil passages, a manipulation signal of the handle; And calculating a flow rate of the hydraulic oil corresponding to the manipulation signal; and calculating a sum of hydraulic oil flows corresponding to the manipulation signals of the plurality of handles as the hydraulic oil flow required by the plurality of oil passages.

 Specifically, each of the plurality of oil passages has a proportional valve, and the plurality of handles are respectively used for controlling a current applied to the proportional valve to control the amount of hydraulic oil of the oil passage in which the proportional valve is located, This controls the speed of movement of the action element corresponding to the oil path. Figure 2 is a graph showing the relationship between the AD value of the steering signal and the current input to the proportional valve. Figure 3 is the relationship between the current applied to the proportional valve and the flow rate of the proportional valve when the displacement of the oil pump is constant. . The calculation process of the hydraulic oil flow required for the plurality of oil passages will be specifically described below with reference to Figs. 2 and 3.

 As shown in Fig. 2, the correspondence between the AD value of the steering signal (i.e., the analog-to-digital conversion value) and the current applied to the proportional valve is as follows:

(1) When the AD value of the manipulated signal is 0- Α ^ _η , the current applied to the proportional valve is zero. The

0-^) The dish is the dead zone of the handle, which is used to prevent the handle from shaking and to activate the action element.

(2) When the AD value of the steering signal is Α _η - AZ) _max , the AD value of the steering signal is linearly related to the applied current /:

 Max nun

 (AD-AD^ )+I

 U

Where A) _mm is the minimum AD value of the steering signal (for example, can be 12), A) is the manipulation The maximum AD value of the signal (for example, 127), / when the AD value of the steering signal is Α _η , the current applied to the proportional valve; / when the AD value of the steering signal is AZ) _max , is applied to the proportional valve Current. The current applied to the proportional valve can be calculated based on the linear relationship and the AD value of the steering signal (ie, A in the equation).

 As shown in FIG. 3, the correspondence between the current applied to the proportional valve and the flow rate F of the proportional valve (ie, the hydraulic oil flow rate of the oil passage in which the proportional valve is located) under certain conditions of the displacement of the oil pump The relationship is as follows:

 (1) When the current applied to the proportional valve / <minimum current /, the flow rate F of the proportional valve is 0;

(2) When the current applied to the proportional valve / minimum current / _mn , the flow rate F of the proportional valve satisfies the following linear relationship:

Where _η is the flow rate of the proportional valve when the current applied to the proportional valve is the minimum current / _mn ; F _max is the flow rate of the proportional valve when the current applied to the proportional valve is the maximum current / hr. Based on the linear relationship and the current / applied to the proportional valve calculated from the steering signal, the flow rate F of the proportional valve, that is, the hydraulic oil flow required for the oil passage in which the proportional valve is located, can be calculated.

 According to the above calculation process, the required hydraulic oil flow rate of the oil passage is calculated for each oil passage, and then the sum of the required hydraulic oil flow rates of the plurality of oil passages is calculated as the plurality of oil passages. Required hydraulic oil flow. For example, for a pump truck, the sum of the following items can be calculated as the hydraulic oil flow required for the plurality of oil passages: the hydraulic oil flow required for the left turn of the turntable, the hydraulic oil flow required for the right turn of the turntable, and each The hydraulic oil flow required for the boom to move upwards and the hydraulic oil flow required for each boom to move downward. Further, the relationship shown in Figs. 2 and 3 is merely an example, and the present invention is not limited thereto.

When the hydraulic oil flow that the oil pump can provide is greater than or equal to the hydraulic oil flow required by the plurality of oil passages, the hydraulic oil flow required for each oil passage can be distributed as needed. Calculating the hydraulic oil flow rate that can be provided by the oil pump when the hydraulic oil flow rate is lower than the hydraulic oil flow rate required by the plurality of oil passages a ratio between a hydraulic oil flow that can be supplied and the desired hydraulic oil flow, and for each of the plurality of oil passages, a product of the hydraulic oil flow required for the oil passage and the ratio The hydraulic oil flows to the oil circuit.

 Wherein, the hydraulic oil flow rate of the hydraulic oil flow required to provide the oil passage and the ratio of the hydraulic oil flow to the oil passage includes: applying a current corresponding to the hydraulic oil flow of the product of the ratio to the oil A proportional valve in the road, thereby controlling the flow rate of the proportional valve, gp, the hydraulic oil flow rate of the oil passage in which the proportional valve is located. The specific implementation process is as follows:

(1) When the hydraulic oil flow rate F _ALLOCATED assigned to the oil passage is less than the minimum flow rate _η of the proportional valve located in the oil passage, the current applied to the proportional valve is zero. (2) The hydraulic oil flow rate F _a „·^ assigned to the oil circuit is greater than or equal to the minimum flow rate F _max of the proportional valve located in the oil circuit, the current applied to the proportional valve /. „The following relationship is satisfied: FF ,

Wherein, the ratio between the hydraulic oil flow rate that can be provided and the required hydraulic oil flow rate. ^ is the flow required for the oil circuit, which is calculated from the manipulated signal. F _ALLOCATED is the hydraulic oil flow rate assigned to the oil passage, that is, the product of the hydraulic oil flow required for the oil passage and the ratio.

 By applying the calculated current to the proportional valve located in the plurality of oil passages, the hydraulic oil amount of each of the plurality of oil passages can be proportionally distributed, so that the action elements corresponding to the plurality of oil passages Action coordination.

Accordingly, the present invention also provides a hydraulic oil flow distribution device for a hydraulic system, the hydraulic system including a plurality of oil passages and an oil pump for supplying hydraulic oil to the plurality of oil passages, the apparatus comprising: the first hydraulic oil flow rate calculation The device 10 is configured to calculate a hydraulic oil flow that the oil pump can provide; the second hydraulic oil flow calculation device 20 is configured to calculate a hydraulic oil flow required by the plurality of oil passages; and a hydraulic oil flow supply device 30, Calculating the hydraulic oil flow that can be provided when the hydraulic oil flow that the oil pump can provide is less than the hydraulic oil flow required by the plurality of oil passages A ratio between the required hydraulic oil flows, and for each of the plurality of oil passages, a hydraulic oil flow of the hydraulic oil flow required for the oil passage and the ratio of the hydraulic oil flows to the oil passage.

 Wherein, the first hydraulic oil flow calculating device 10 calculates the hydraulic oil flow that the oil pump can provide by the following formula: q Vg xnxr^ , where g is the hydraulic oil flow that the oil pump can provide, for each of the oil pumps The geometric displacement of the rotation, M is the rotation speed of the oil pump, which is the volumetric efficiency of the oil pump. The second hydraulic oil flow calculation device 20 includes: a manipulation signal acquisition device, configured to acquire a manipulation signal of the handle for each of the plurality of handles corresponding to the plurality of oil passages; And a device, configured to calculate, according to the manipulation signal, a hydraulic oil flow corresponding to the manipulation signal; and a required hydraulic oil flow calculation device, configured to calculate a sum of hydraulic oil flows corresponding to the manipulation signals of the plurality of handles, Take the hydraulic oil flow required as the plurality of oil passages.

 Wherein, the plurality of oil passages include: an oil passage of the oil pump to the hydraulic motor and an oil passage of the oil pump to the at least one boom cylinder; or an oil passage of the oil pump to at least two boom cylinders.

 Wherein each of the plurality of oil passages has a proportional valve, and the hydraulic oil flow supply device includes: a current applying device for applying a current corresponding to the flow of the hydraulic oil of the ratio to a ratio located in the oil passage valve.

 For details of the hydraulic oil flow distribution device, please refer to the previous description of the hydraulic oil flow distribution method, which will not be described here.

 Through the above technical solution, when the hydraulic oil flow that the oil pump can provide is less than the hydraulic oil flow required by the plurality of oil passages, the hydraulic oil flow that the oil pump can provide can be proportionally distributed to each oil passage, so that The hydraulic oil flow rate assigned to each oil line is correspondingly reduced. Therefore, the action elements (e.g., the boom, the turntable, etc.) corresponding to each oil path are slow, but the coordinated action is ensured, and the compound motion is realized.

The preferred embodiments of the present invention have been described in detail above with reference to the drawings, but the present invention is not limited to the specific details of the embodiments described above. The technical solution of the invention is subject to various simple modifications which are all within the scope of the invention.

 It should be further noted that the specific technical features described in the above specific embodiments may be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not be further described in various possible combinations.

 In addition, any combination of various embodiments of the invention may be made, as long as it does not deviate from the idea of the invention, and should also be regarded as the disclosure of the invention.

Claims

A hydraulic oil flow distribution method for a hydraulic system, the hydraulic system comprising a plurality of oil passages and an oil pump for supplying hydraulic oil to the plurality of oil passages, wherein the method comprises:  Calculating the hydraulic oil flow that the oil pump can provide;  Calculating the hydraulic oil flow required for the plurality of oil passages;  Calculating a ratio between the hydraulic oil flow rate that can be provided and the required hydraulic oil flow rate when the hydraulic oil flow that the oil pump can provide is less than the hydraulic oil flow rate required by the plurality of oil passages And providing, for each of the plurality of oil passages, a hydraulic oil flow rate of the hydraulic oil flow required by the oil passage and the ratio of the hydraulic oil flow to the oil passage. 2. The method according to claim 1, wherein the hydraulic oil flow rate that the oil pump can provide is calculated by the following formula: q = V _g xnxr] _v ,  Where g is the hydraulic oil flow that the oil pump can provide, the geometric displacement per revolution of the oil pump, and M is the rotational speed of the oil pump, which is the volumetric efficiency of the oil pump. 3. The method according to claim 1, wherein the calculating the hydraulic oil flow required for the plurality of oil passages comprises the steps of:  Obtaining a manipulation signal of the handle for each of the plurality of handles corresponding to the plurality of oil passages;  Calculating a hydraulic oil flow rate corresponding to the manipulation signal according to the manipulation signal; and calculating a sum of hydraulic oil flow rates corresponding to the manipulation signals of the plurality of handles as the hydraulic oil flow rate required for the plurality of oil passages. The method according to claim 1, wherein the plurality of oil passages comprise: an oil passage of the oil pump to a hydraulic motor and an oil passage of the oil pump to at least one boom cylinder; or  The oil pump is pumped to the oil path of at least two boom cylinders. The method according to claim 1, wherein each of the plurality of oil passages has a proportional valve, and the hydraulic oil flow rate of the hydraulic oil flow required to provide the oil passage and the ratio is The oil passage includes: applying a current corresponding to the flow of the hydraulic oil of the ratio to the proportional valve located in the oil passage. 6. A hydraulic oil flow distribution device for a hydraulic system, the hydraulic system comprising a plurality of oil circuits and an oil pump for supplying hydraulic oil to the plurality of oil circuits, wherein the device comprises:  a first hydraulic oil flow calculating device (10) for calculating a hydraulic oil flow rate that the oil pump can provide;  a second hydraulic oil flow calculating device (20) for calculating a hydraulic oil flow rate required for the plurality of oil passages;  a hydraulic oil flow supply device (30) for calculating the hydraulic oil flow rate and the hydraulic oil flow rate that can be provided when the hydraulic oil flow that the oil pump can provide is less than the hydraulic oil flow required by the plurality of oil passages Deriving a ratio between required hydraulic oil flows, and for each of the plurality of oil passages, providing a hydraulic oil flow required for the oil passage and a product of the ratio to the oil passage . 7. The apparatus according to claim 6, wherein the first hydraulic oil flow calculating device (10) calculates the hydraulic oil flow that the oil pump can provide by the following formula: 9 = ν ₈ χ _η χ η _ν , Where g is the hydraulic oil flow that the oil pump can provide, the geometric displacement per revolution of the oil pump, and M is the rotational speed of the oil pump, which is the volumetric efficiency of the oil pump. 8. The apparatus according to claim 6, wherein the second hydraulic oil flow calculating device (20) comprises: a manipulation signal acquisition device, configured to acquire a manipulation signal of the handle for each of the plurality of handles corresponding to the plurality of oil passages;  a hydraulic oil flow calculating device, configured to calculate a hydraulic oil flow corresponding to the steering signal according to the steering signal;  The required hydraulic oil flow calculating device is configured to calculate a sum of hydraulic oil flows corresponding to the manipulation signals of the plurality of handles as the hydraulic oil flow required for the plurality of oil passages. 9. The apparatus according to claim 6, wherein the plurality of oil passages comprise: an oil passage of the oil pump to a hydraulic motor and an oil passage of the oil pump to at least one boom cylinder; or  The oil pump is pumped to the oil path of at least two boom cylinders. 10. The apparatus according to claim 6, wherein each of the plurality of oil passages has a proportional valve, and the hydraulic oil flow providing device comprises: a current applying device for applying a hydraulic oil with a product of the ratio The current corresponding to the flow rate is to the proportional valve located in the oil passage.