WO2011029330A1

WO2011029330A1 - Constant-speed control device for mixer truck, mixer truck using the same and method for controlling drum to rotate at constant speed

Info

Publication number: WO2011029330A1
Application number: PCT/CN2010/074219
Authority: WO
Inventors: 柳建文; 张克军; 储成火
Original assignee: 湖南三一智能控制设备有限公司; 三一重工股份有限公司
Priority date: 2009-09-11
Filing date: 2010-06-22
Publication date: 2011-03-17
Also published as: CN101642939B; CN101642939A

Abstract

A constant-speed control device for a mixer truck, a mixer truck using the same and a method for controlling a drum to rotate at a constant speed are provided. The constant-speed control device for the mixer truck includes a hydraulic pump (20), a hydraulic motor (30) and a controller (100). The hydraulic pump (20) driven by an engine (10) of the mixer truck provides hydraulic power to the hydraulic motor (30), then the hydraulic motor (30) rotates the drum (40) of the mixer truck. The controller (100) includes an input module (101), an analysis module (102) and an output module (103). The input module (101) is linked to the engine (10) and outputs the actual rotating speed of the engine (10) to the analysis module (102). Then the analysis module (102) determines the predetermined displacement according to the actual rotating speed and the predetermined rotating speed of the drum (40), and outputs the predetermined displacement to the output module (103). The output module outputs a variable signal to a variable mechanism of the hydraulic pump (20) according to the predetermined displacement. The mixer truck using the constant-speed control device can improve adaptability and stability.

Description

Method for constant speed control device of mixer truck, mixer truck and constant speed control of mixing drum The application is submitted to the Chinese Patent Office on September 11, 2009, and the application number is 200910170777.1. The invention name is "mixing vehicle constant speed control device, mixer truck" The priority of the Chinese Patent Application, which is incorporated herein by reference. Technical field

The invention relates to a constant speed control technology for a concrete mixer truck, in particular to a constant speed control device for a mixer truck and a method for controlling the constant rotation speed of the mixer drum, so as to realize the control of the rotation speed of the mixer drum, and also relates to A mixer truck having the above-described constant speed control device for a mixer.

Background technique

With the continuous development of the construction industry, the output of the mixer truck is increasing year by year; in order to ensure that the concrete to be conveyed maintains the predetermined quality, the mixer truck is required to meet the predetermined conditions throughout the transportation process, and the predetermined conditions may include:

First, keep the mixing drum rotating, that is, the mixing drum must keep rotating during the whole transportation process to avoid concrete solidification; if the mixing drum is stopped for more than 10 minutes, the concrete in the mixing drum will solidify and stick; Failure to deal with it in time will result in the overall solidification of the concrete in the mixing drum. In severe cases, the concrete in the mixing drum will be reported, and even the mixing drum will be reported.

The second keeps the rotating speed of the mixing drum slower; according to the characteristics of the concrete, the mixing truck can not exceed 90 minutes from feeding to discharging, and the number of rotations of the mixing drum cannot be more than 300 rpm, and 300 rpm here It is the total number of revolutions of the mixing drum in the whole process of transportation, including the sum of the number of revolutions of the mixing drum under various working conditions such as feeding, agitation and unloading. Since the mixing drum needs to rotate rapidly during feeding and unloading, this reduces the number of revolutions that allow the mixing drum to rotate during transportation; therefore, in general, the speed of the mixing drum is generally limited to 1 during the transportation of the mixer truck. -3 rpm to prevent the concrete being carried from being overcooked.

Thirdly, the rotation speed of the mixing drum should be kept constant, that is, the stirring speed of the mixing drum must be uniform and constant, and it is not affected by the change of the output speed of the mixer truck, and should also be independent of the walking speed of the mixer truck; thus avoiding changes due to road conditions. When the engine output speed of the mixer changes, the rotation speed of the mixer drum changes, resulting in uneven flow of concrete in the mixer drum, which destroys the quality of the concrete.

Currently, there are roughly three ways to keep the mixer drum rotating at a constant speed. The first type is a drive system equipped with a separate drive drum rotation; the engine can be separately configured, and the output power of the engine can be adjusted to meet the rotation speed requirements of the mixer drum under different working conditions, so that the mixer drum maintains a constant speed rotation during the transportation of the mixer truck. Since the driving system of the mixing drum in this mode operates independently, the constant speed rotation of the mixing drum can be ensured. However, due to the disadvantages of high cost and low economy, the application has been reduced.

The second type adopts the control mode of the hydraulic constant speed valve; in this mode, the hydraulic motor of the hydraulic system provides the driving force for the mixing drum, and the hydraulic pump of the hydraulic system is driven by the engine of the mixer truck, in order to ensure the constant speed of the hydraulic motor Rotating, the hydraulic system is also provided with a constant speed valve, which controls the flow rate of the hydraulic pump to the hydraulic motor, keeps the flow rate of the hydraulic oil supplied to the hydraulic motor constant, and thereby keeps the hydraulic motor rotating at a constant speed. Due to the limitation of the output flow of the hydraulic pump, this method can only keep the mixing drum rotating at a constant speed within a narrow range, and cannot adjust the rotation speed of the mixing drum within a large range; further, during loading and unloading The rotation speed of the mixing drum is difficult to increase, and it is difficult to adapt to various work needs. This method has the disadvantage of poor adaptability.

The third type is an electronic constant speed transmission mode; in this mode, the hydraulic system is used to drive the mixing drum to rotate, and a sensor and a controller are also provided. The sensor collects the actual rotation speed of the hydraulic motor, and feeds back the actual rotation speed of the hydraulic motor. The controller compares the actual speed of the hydraulic motor fed back by the sensor with the predetermined speed, and adjusts the output flow of the hydraulic pump according to the comparison result, thereby keeping the flow rate of the hydraulic oil supplied to the hydraulic motor constant, so that the hydraulic motor is at a predetermined speed Rotate. This method realizes the control of the mixing drum through the closed loop mode of control and feedback. There is a defect that the rotating speed of the mixing drum is unstable and the rotating speed of the mixing drum fluctuates, and there is hysteresis in the rotation speed control of the mixing drum. The specific control method is to use a set of controllers and micro-motors to control the engine throttle opening to control the engine speed. The control system is very complicated, and the cost is high, the reliability is poor, and it is difficult to meet the constant mixing drum. The need for speed control.

In short, the existing constant speed control technology of the mixing drum cannot simultaneously ensure economical, adaptability and rotational stability of the mixing drum.

Summary of the invention

SUMMARY OF THE INVENTION A first object of the present invention is to provide a constant speed control device for a mixer truck to simultaneously ensure the economy, adaptability, and rotational stability of the mixer drum constant speed control device.

A second object of the present invention is to provide a constant speed control device for a remotely operated mixer A third object of the present invention is to provide a mixer truck having the above-described constant speed control device for a mixer.

A fourth object of the present invention is to provide a method of controlling the constant rotation speed of a mixing drum.

In order to achieve the above first object, the constant speed control device for a mixer provided by the present invention comprises hydraulic power of a hydraulic pump, the hydraulic motor drives rotation of a mixing drum of the mixer truck, and further includes a controller, the controller including an input module And an output module connected to the engine, and outputting an actual rotational speed of the engine to the analysis module, the analysis module obtaining the hydraulic pressure according to the actual rotational speed and a predetermined rotational speed of the mixing drum a predetermined displacement of the pump and outputting the predetermined displacement to the output module; the output module outputs a variable signal to the variable mechanism of the hydraulic pump according to a predetermined displacement.

Preferably, the input module is connected to an electronic control unit of the engine; the variable mechanism is an electronically controlled variable mechanism, and the output module is connected to an electronically controlled variable mechanism.

Preferably, the controller is further provided with a startup input module, and the startup input module is connected to the startup circuit of the mixer truck, and outputs a startup signal of the mixer truck to the output module, and the output module is further configured according to the startup signal. The variable mechanism outputs a variable signal.

Preferably, the controller further has a load output module that detects the load of the engine and outputs a load signal to the electronic control unit based on the load of the engine.

Preferably, the controller further has a detection module and a mode selection module; the detection module collects a status signal characterizing the state of the agitator, and outputs a status signal to the mode selection module; the mode selection module receives the The status signal conveys the mode signal to the analysis module; the analysis module determines the predetermined speed based on the mode signal.

Preferably, the mode selection module further outputs a mode signal to the electronic control unit.

Preferably, the mixer constant speed control device further includes an operating mechanism, the operating mechanism is coupled to the controller, and the analyzing module of the controller determines the predetermined rotational speed according to an instruction output by the operating mechanism.

In order to achieve the above second object, in the mixer constant speed control device, the operating mechanism includes a remote control transmitting device and a remote control receiving device, and the remote control receiving device sends an analysis signal to the controller according to a signal transmitted by the remote control transmitting device. Output instructions. In order to achieve the above third object, the present invention also provides a mixer truck, the mixer truck comprising an engine and a control device, wherein the control device provides any of the above-mentioned technical solutions to provide a constant speed control device for the mixer truck, the engine and the vehicle The hydraulic pump is connected.

In order to achieve the above fourth object, the method for controlling the constant rotation speed of the mixing drum provided by the present invention comprises the following steps:

Detecting the actual speed of the engine;

Determining a predetermined displacement of the hydraulic pump according to the actual rotational speed and a predetermined rotational speed of the mixing drum; the hydraulic pump providing hydraulic power to a hydraulic motor that drives the mixing drum to rotate;

The hydraulic pump displacement is adjusted according to the predetermined displacement. The signal detects the actual speed of the engine.

Compared with the prior art, the constant speed control device of the mixer provided by the invention directly controls the displacement of the hydraulic pump according to the actual rotation speed of the engine, thereby realizing the control of the speed of the hydraulic motor; and further, the mixing drum can be made during the transportation of the mixer truck. Keep rotating at a constant speed. First of all, unlike the technical solutions provided in the prior art, the technical solution provided by the present invention controls the displacement of the hydraulic pump according to the actual rotational speed of the engine, thereby achieving constant speed rotation of the mixing drum, and provides a realization from a new angle. The technical scheme of controlling the constant speed rotation of the mixing drum and controlling the rotation speed of the mixing drum also provides a new technical idea of controlling the rotation speed of the mixing drum. Secondly, since the technical solution provided by the present invention adjusts the displacement of the hydraulic pump according to the actual rotational speed of the engine, the rotation speed of the mixing drum can be adjusted within a large range to meet the needs of loading and unloading, and the The adaptability of the mixer truck of the constant speed control device of the mixer; again, the technical solution provided by the invention directly controls the rotation speed of the mixer drum according to the actual rotation speed of the engine, and does not require a separate drive system or component, and has high economic performance; Since it is not necessary to control the rotation speed of the mixing drum according to the feedback of the actual rotation speed of the mixing drum, the fluctuation caused by the feedback process can be avoided, thereby improving the stability of the rotation of the mixing drum; at the same time, the hysteresis of the rotation speed control of the mixing drum can be alleviated. Improve control performance.

In a further technical solution, obtaining the actual rotational speed of the engine by the signal output by the electronic control unit of the engine can make the actual rotational speed of the obtained engine more accurate and reliable, thereby ensuring the accuracy and reliability of the predetermined rotational speed of the mixing drum. In addition, the above purpose can be achieved by the engine electronic control unit, and the connection between the controller and the electronic control unit can be realized through the CANH and CANL of the single unit. The communication between the controller and the electronic control unit is implemented according to the J1939 protocol; further, the control of the engine speed can be realized by appropriate software, thereby having the advantages of lower cost, more reliable performance, and more physical connection. .

In a further technical solution, when the engine is started, the controller can output a variable signal to the variable mechanism of the hydraulic pump according to the start signal input by the start input module, so that the hydraulic pump stops outputting the hydraulic oil, so that the mixer can be made The engine achieves no load or small load start, which is convenient for starting the mixer truck engine.

In a further technical solution, the controller further has a load output module connected to the electronic control unit, the load output module detects the load of the mixer truck engine, and outputs a load signal to the electronic control unit according to the load of the engine, so that the engine adjusts the output thereof. The power, in turn, achieves an accurate match between the output power of the engine and the load; this technical solution can match the output power of the engine with the need of the actual power of the mixer to save energy consumption and reduce fuel consumption.

In a further technical solution, the controller further includes a detection module and a mode selection module; the detection module collects a status signal indicating a state of the agitator, and outputs a status signal to the mode selection module; the mode selection module is configured according to Receiving a status signal and predetermined information to determine an appropriate mode and transmitting an appropriate mode signal to the analysis module; the analysis module determining a predetermined rotational speed of the mixing drum based on the mode signal to control the hydraulic pump displacement according to the predetermined rotational speed In turn, the control of the rotation speed of the mixing drum is realized. The technical solution can restrict the operator to arbitrarily modify or close the rotation mode of the mixing drum by preset corresponding multiple modes, and can reduce the damage of the mixing wheel raceway when the mixing drum does not rotate when the vehicle is delivered.

The agitator having the above-described constant speed control device for a mixer truck provided by the present invention also has the above-described technical effects. Also, since the method of controlling the constant rotation speed of the mixer drum can be carried out by the above-described mixer constant speed control device, the method of controlling the constant rotation speed of the mixer drum is also provided with the above technical effects.

DRAWINGS

1 is a schematic structural view of a constant speed control device for a mixer truck according to a first embodiment of the present invention; FIG. 2 is a schematic diagram of a control principle of a constant speed control device for a mixer truck according to a first embodiment of the present invention; The control process of the constant speed control device of the mixer truck is indicated, and at the same time, the figure is also a flowchart of a method for controlling the constant rotation speed of the mixer drum;

4 is a schematic diagram of a control principle of a constant speed control device for a mixer truck according to a second embodiment of the present invention; FIG. 5 is a schematic diagram of a control principle of a constant speed control device for a mixer truck according to a third embodiment of the present invention; Figure 6 is a schematic view showing the control principle of the constant speed control device for the mixer truck according to the fourth embodiment of the present invention; Figure 7 is a schematic view showing the control principle of the constant speed control device for the mixer truck according to the fifth embodiment of the present invention; Schematic diagram of the remote control of the remote control device of the mixer. detailed description

The present invention is described in detail below with reference to the accompanying drawings, and the description of the present invention is merely exemplary and explanatory, and should not be construed as limiting the scope of the invention.

It should be noted that: In this document, the method of controlling the constant speed of the mixer drum is described while describing the constant speed control device of the mixer truck. The method of controlling the constant speed of the mixer drum is not separately described.

The basic idea of the constant speed control device for a mixer truck provided by the present invention is that, in the case of having a predetermined transmission ratio between the engine and the hydraulic pump, the output flow rate of the hydraulic pump is proportional to the output speed of the engine and the displacement of the hydraulic pump; When the pump displacement is constant, the engine speed changes, and the output flow of the hydraulic pump also changes; therefore, to keep the output of the hydraulic pump constant, it is necessary to adjust the row of the hydraulic pump when the engine output speed changes. The amount, and the direction of change of the displacement of the hydraulic pump is opposite to the direction of change of the engine output speed, so that the output flow of the hydraulic pump is kept constant. For the hydraulic system, the rotational speed of the hydraulic motor driving the mixing drum is proportional to the output flow of the hydraulic pump. If the output flow of the hydraulic pump can be kept constant, the rotational speed of the hydraulic motor can be kept constant, achieving the object of the present invention.

1 and FIG. 2, FIG. 1 is a schematic view showing the structure of a constant speed control device for a mixer according to a first embodiment of the present invention, and FIG. 2 is a schematic diagram showing the control principle of a constant speed control device for a mixer according to a first embodiment of the present invention.

The constant speed control device of the mixer provided in the first embodiment includes a hydraulic system including a hydraulic pump 20, a hydraulic motor 30 and a controller 100. For the sake of clarity, the engine 10 and the mixer drum 40 are also shown in FIG. The hydraulic pump 20 is driven by the engine 10 of the mixer truck. The hydraulic pump 20 is connected to the hydraulic motor 30 via a hydraulic oil circuit 30 for driving the mixing drum 40 of the mixer truck to rotate; The controller 100 includes an input module 101, an analysis module 102, and an output module 103. The input module 101 is connected to the engine 10 of the mixer truck and outputs the actual speed of the engine 10 to the analysis module 102. The analysis module 102 is based on the engine 10. The actual rotational speed and the predetermined rotational speed of the mixing drum 40 obtain a predetermined displacement of the hydraulic pump 20, and output the predetermined displacement to the output module 103, and the output module 103 according to the pre- The fixed displacement outputs a variable signal to the variable mechanism 300 of the hydraulic pump 20, which adjusts the displacement of the hydraulic pump 20 based on the variable signal to cause the hydraulic pump 20 to output the hydraulic oil at a predetermined displacement.

As shown in Figure 3. The figure is a schematic diagram of the control process of the constant speed control device of the mixer truck according to the first embodiment of the present invention. At the same time, the figure is also a flowchart of a method for controlling the constant rotation speed of the mixer drum, the method comprising the following steps:

S100, detecting the actual rotational speed of the engine 10. Specifically, the input module 101 collects the actual rotational speed of the engine 10. In this example, the engine 10 of the mixer truck has an electronic control unit 200, and the input module 101 is connected to the electronic control unit 200. Since the electronic control unit 200 is used to control the engine 10, including controlling the rotational speed of the engine 10, the input module 101 can pass The signal generated by the electronic control unit 200 collects the actual rotational speed of the engine 10; the preferred technical solution is: the actual rotational speed of the engine 10 obtained through the CAN interface of the electronic control unit 200, so that the obtained actual rotational speed is more accurate; The electronic control unit 200 can be connected to the input module by shielding the twisted pair, and the physical connection is very simple. The mode acquisition, for example, the actual speed of the engine 10 can be detected by a suitable sensor.

S200, determining that the ratio of the speed of the pre-engine 10 and the hydraulic pump 20 of the hydraulic pump 20 is 1:1 according to the actual rotation speed of the engine 10 and the predetermined rotation speed of the mixer drum 40. Therefore, according to the formula: the actual rotation speed of the engine X the predetermined displacement of the hydraulic pump = hydraulic motor displacement X reducer speed reduction ratio X drum speed, wherein the hydraulic motor displacement, reducer reduction ratio is constant; therefore, to achieve constant speed rotation of the mixer drum 40, as long as the actual speed of the engine 10 and The product of the predetermined displacement of the hydraulic pump 20 may be constant. Therefore, after determining the actual rotational speed of the engine 10, the predetermined displacement of the hydraulic pump 20 can be determined. In this example, the analysis module 102 presets a predetermined rotation speed of the mixing drum 40, and can obtain a predetermined displacement of the hydraulic pump 20 according to the predetermined rotation speed and the actual rotation speed of the engine 10. The analysis module 102 also outputs the obtained predetermined displacement to the Output module.

S300, adjusting the displacement of the hydraulic pump 20 according to the predetermined displacement, so that the hydraulic pump 20 outputs the hydraulic oil at a predetermined displacement. In this example, the output module 103 outputs a variable signal to the variable mechanism 300 of the hydraulic pump 20 according to the predetermined displacement, so that the variable mechanism 300 adjusts the displacement of the hydraulic pump 20 according to the variable signal, so that the hydraulic pump 20 outputs the hydraulic oil at a predetermined displacement. Further, the output flow rate of the hydraulic pump 20 is kept constant. Since the displacement of the hydraulic motor 30 remains unchanged, the hydraulic motor 30 is constant with the output flow of the hydraulic pump 20 remaining unchanged. The rotational speed drives the mixing drum 40 to rotate to achieve the object of the present invention. In this example, the variable mechanism 300 of the hydraulic pump 20 is an electronically controlled variable mechanism, and the output module 103 generates different current signals according to different predetermined displacements, so that the electronically controlled variable mechanism generates a change corresponding to the predetermined displacement. The adjustment of the displacement of the hydraulic pump 20 is achieved. Thus, when the number of revolutions of the engine 10 is changed, the output flow rate of the hydraulic pump 20 can be kept constant, and the object of the present invention can be achieved. It will be appreciated that depending on the particular form of the variable mechanism 300 of the hydraulic pump 20, the displacement of the hydraulic pump 20 can also be adjusted in an appropriate manner.

Different from the technical solutions provided in the prior art, the technical solution provided by the present invention controls the displacement of the hydraulic pump 20 according to the actual rotational speed of the engine 10, thereby achieving constant speed rotation of the mixing drum 40, and also provides a new surgical solution. A new technical idea of controlling the rotational speed of the mixing drum 40 is presented. In addition, the following technical effects are also obtained: First, since the technical solution provided by the present invention adjusts the displacement of the hydraulic pump 20 according to the actual rotational speed of the engine 10, the rotational speed of the mixing drum 40 can be adjusted within a wide range to satisfy the charging. The need for rapid rotation of the unloading material improves the adaptability of the mixer truck having the constant speed control device of the mixer truck. Secondly, the technical solution provided by the present invention directly controls the rotation speed of the mixer drum 40 according to the actual rotation speed of the engine 10, and does not need A separate drive system or component has strong economic performance; thirdly, since it is not necessary to control the rotation speed of the mixer drum 40 according to the feedback of the actual rotation speed of the mixer drum 40, fluctuations due to the feedback process can be avoided, and the mixer drum 40 can be improved. The stability of the rotation can also avoid or alleviate the hysteresis of the rotation speed control of the mixing drum 40.

It can be understood that the load formed by the mixer drum 40 may affect the starting performance of the engine 10 when the mixer motor 10 is started. In order to avoid the adverse effect of the mixer drum 40 on the starting performance of the engine 10, the second embodiment of the present invention provides another A structure constant speed control device for a mixer truck.

Please refer to FIG. 4. FIG. 4 is a schematic diagram showing the control principle of the constant speed control device for the mixer truck according to the second embodiment of the present invention. Compared with the first embodiment, the controller of the mixer car provided in the second embodiment further includes a start input module 104, the start input module 104 is connected to the starter circuit 400 of the mixer truck, and outputs the start signal of the mixer truck to the output module 103; When the mixer truck is started, the output module 103 outputs a variable signal according to the start signal. At this time, the hydraulic pump 20 adjusts its displacement to zero according to the variable signal outputted by the output module, and stops discharging the hydraulic oil. Since the output displacement of the hydraulic pump 20 is zero, the load on the engine 10 is zero, which avoids adversely affecting the starting performance of the mixer motor 10. It can be understood that when the engine 10 is started, the output module 103 preferentially outputs according to the start signal input by the start input module 104. After the startup, the startup input module 104 no longer outputs the activation signal, and the output module 103 outputs the variable signal in the manner of the first embodiment to achieve the object of the present invention. It can be understood that the startup input module 104 can also output an activation signal to the analysis module 102, and cause the analysis module 102 to determine the predetermined displacement to zero, and output the predetermined displacement to the output module 103, and the output module 103 according to the predetermined displacement. By outputting the variable signal, the hydraulic pump 20 can also stop the output of the hydraulic oil, thereby achieving the above object.

It can be understood that when the amount of concrete in the mixing drum 40 and the rotating speed of the mixing drum 40 are changed, the load formed on the hydraulic system also changes, and further, the load formed by the hydraulic system on the engine 10 also changes; the load is different, and the engine 10 is required. The power provided is also different. When the load formed by the hydraulic system changes, such as keeping the output of the engine 10 constant, it will inevitably affect the driving performance of the mixer, which in turn affects the driving operation of the mixer. In order to avoid the adverse effect on the driving performance of the mixer truck when the load formed by the mixer drum 40 is changed, the third embodiment of the present invention provides a constant speed control device for the mixer truck of another configuration.

Please refer to FIG. 5 , which is a schematic diagram of a control principle of a constant speed control device for a mixer truck according to a third embodiment of the present invention. The third embodiment is improved on the basis of the second embodiment. Compared with the second embodiment, the implementation exception further includes a load output module 105, and the load output module 105 receives the predetermined displacement output by the analysis module 102, due to the predetermined row. The amount determines the displacement of the hydraulic pump 20, and the displacement of the hydraulic pump 20 is in a predetermined proportional relationship with the load formed by the hydraulic pump 20 on the engine 10, so that the load output module 105 can be directed to the electronic control unit according to the magnitude of the predetermined displacement. The 200 outputs a predetermined load signal to cause the engine 10 to adjust the output torque in accordance with the load signal. It can be understood that the load output module 105 can also receive the variable signal of the output module 103, and can output a predetermined load signal to the electronic control unit 200 according to the variable signal, so that the engine 10 adjusts the output torque according to the load signal, thereby making the engine The output power of 10 is matched with the power required by the mixer to reduce fuel consumption and improve the economic performance of the mixer. At the same time, it can improve the driving performance and driving performance of the mixer. It can be understood that in order to make the load output module 105 more accurate in obtaining the load of the mixer truck, other devices can be set to detect the load, for example; a pressure sensor for detecting the hydraulic oil pressure of the hydraulic system can be provided, and the pressure sensor is connected to the load output module. Thus, the load output module 105 can detect the external load of the engine 10 based on the hydraulic system pressure.

Please refer to FIG. 6 , which is a schematic diagram of the control principle of the constant speed control device of the mixer provided in the fourth embodiment of the present invention. The fourth embodiment is improved on the basis of the second embodiment. Compared with the second embodiment, the fourth embodiment is compared with the second embodiment. The provided constant speed control device of the mixer further includes a detection module 106 and a mode selection module 107, the inspection The detection module 106 detects a status signal characterizing the state of the agitator, and outputs the obtained status signal to the mode selection module 107; the mode selection module 107 transmits the mode signal to the analysis module 102 according to the received status signal, the specific implementation manner Alternatively, the mode selection module 107 presets a plurality of modes, and after receiving the status signal, selects a predetermined mode according to a predetermined manner, and transmits a mode signal indicating the mode to the analysis module 102; The analysis module 102 determines the predetermined rotation speed of the mixing drum 40 according to the mode signal. The specific implementation manner may be: preset a plurality of predetermined rotation speeds in the analysis module 102, and select a suitable reservation according to a predetermined strategy after receiving the mode signal. The rotation speed is output to the output module; thus, the controller 100 can determine the variable signal according to the predetermined rotation speed of the mixer drum 40, so that the rotation speed of the mixer drum 40 matches the state of the mixer truck. The mode selection module 107 can have a plurality of preset modes, for example, the preset delivery mode can be prevented to prevent the abnormal operation mode from causing damage to the mixer car; or the lock mode can be preset to be in a predetermined state. The mixing drum 40 is locked in a predetermined state to protect the interests of the owner and the manufacturer; the emergency mode can also be preset, and in the emergency state, the mixing drum 40 is stopped or other predetermined state to prevent the mixing drum 40 from appearing larger. loss. The mode selection module may further output a mode signal to the electronic control unit 200, so that the electronic control unit 200 controls the operating state of the engine 10 according to the mode signal, and further adjusts the overall running state of the mixer by the electronic control unit 200, thereby further implementing The control of the mixer truck; of course, the control of the engine 10 can also be preset with an appropriate mode to cause the engine 10 to output different power, torque or speed according to the mode signal to maintain the optimal operating state of the engine 10.

The manner in which the detecting module 106 detects the state of the mixer truck can have various options. The state of the mixer truck can be detected by different sensors, and the combination of the plurality of sensors can determine the state of the mixer truck more accurately; and can also be connected to the detecting module 106. The input device is realized in such a manner that the operation mode of the mixing drum 40 is selected by manual input to realize the interaction between the operator and the constant speed control device of the mixer.

In order to better realize the human-computer interaction, an appropriate operating mechanism can also be provided. Please refer to FIG. 7. FIG. 7 is a schematic diagram showing the control principle of the constant speed control device of the mixer provided in the fifth embodiment of the present invention. In this embodiment, an operating mechanism 500 is provided.

Compared with the fourth embodiment, the constant speed control device of the mixer provided in the fifth embodiment includes a remote control transmitting device 510 and a remote control receiving device 520 in addition to the hydraulic pump 20, the hydraulic motor 30 and the controller 100. The remote control transmitting device 510 and the remote control receiving device 520 constitute an operating mechanism 500. The remote control receiving device 520 outputs an instruction to the analysis module 102 of the controller 100 according to a signal transmitted by the remote control transmitting device 510. The analysis module 102 determines the predetermined rotational speed of the mixing drum 40 according to the command output by the operating mechanism 500, and outputs a predetermined rotational speed to the output module 103, causing the output module 103 to output a variable signal to the variable mechanism 300, adjusting the displacement of the hydraulic pump 20, and making the hydraulic pump The hydraulic oil is output at a predetermined flow rate, and the hydraulic motor 30 is rotated at a predetermined rotational speed. It can be understood that the specific implementation can use a plurality of options, and the operating mechanism 500 can be connected to the detecting module 106 of the controller 100, and the detecting module 106 can transmit the command to the mode selecting module 107, and the stirring can be realized by the above embodiment. The control of the cylinder speed can also be used to connect the operating mechanism 500 to the mode selection module 107 or the analysis module 102 or the output module 103, as well as achieving the above object.

In this example, the advantages of the control mechanism 500 by the remote control transmitting device 510 and the remote control receiving device 520 are: the control of the rotational speed of the mixing drum 40 can be facilitated; the constant speed control of the mixing vehicle provided in the fifth embodiment of the present invention as shown in FIG. The schematic diagram of the remote control transmitting device of the device may be provided with multiple modes on the remote control transmitting device 510 to facilitate the control of the mixing drum 40. In this example, the remote control transmitting device 510 is provided with feeding, discharging, stopping, rapid stirring, Modes such as constant speed control and automatic control are used to rotate the mixer drum 40 in a predetermined mode according to actual conditions.

It can be understood that the manners in the above embodiments can be combined to form a technical solution to realize the control of the mixing drum 40 and the engine 10. At this time, an appropriate priority level parameter can be preset in the controller, so that the controller can The pre-preset priority level parameter is selected and executed, and a predetermined command is issued; for example, when the mixer car is started, the start signal should be used as the priority execution signal, so that the displacement of the hydraulic pump 20 is zero, so as to facilitate the start of the mixer motor 10 . In addition, in order to facilitate the transmission of signals, the controller can be connected to other parts through CAN, so that the signal transmission and communication are more reliable, and it is also beneficial to expand the function of the controller and realize more control of the function of the mixer car.

Since the constant speed control device for the mixer has the above-described technical effects, the mixer truck having the above-described constant speed control device for the mixer has the corresponding technical effects, and the object of the present invention can be achieved.

The above is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can also make several improvements and retouchings without departing from the principles of the present invention. It should be considered as the scope of protection of the present invention.

Claims

Rights request

A constant speed control device for a mixer truck, comprising a hydraulic pump (20) and a hydraulic motor (30), the hydraulic pump (20) being driven to the hydraulic motor (30) depending on an engine (10) of the mixer truck Providing hydraulic power, the hydraulic motor (30) driving the mixing drum (40) of the mixer to rotate, characterized by further comprising a controller (100), the controller (100) comprising an input module (101) An analysis module (102) and an output module (103), the input module (101) being coupled to the engine (10) and outputting an actual rotational speed of the engine (10) to the analysis module (102), the analysis The module (102) obtains the hydraulic pump according to the actual rotational speed and a predetermined rotational speed of the mixing drum (40)

a predetermined displacement of (20), and outputting the predetermined displacement to an output module (103); the output module (103) outputting a variable to a variable mechanism (300) of the hydraulic pump (20) according to a predetermined displacement signal.

2. The constant speed control device for a mixer according to claim 1, wherein said input module is connected to an electronic control unit (200) of said engine (10); said variable mechanism (300) is electronically controlled The variable mechanism, the output module (103) is connected to the electronically controlled variable mechanism.

3. The constant speed control device for a mixer according to claim 1, wherein the controller (100) is further provided with a start input module (104), the start input module (104) and the start of the mixer truck. The circuit (400) is connected, and outputs a start signal of the mixer to the output module (103), and the output module (103) further outputs a variable signal to the variable mechanism (300) according to the start signal.

The constant speed control device for a mixer according to claim 1, wherein the controller (100) further has a load output module (105), and the load output module (105) detects the engine (10) The load, and outputs a load signal to the electronic control unit (200) according to the load of the engine (10).

The constant speed control device for a mixer truck according to any one of claims 2 to 4, wherein the controller (100) further has a detection module (106) and a mode selection module (107); The detection module (106) collects a status signal indicative of the state of the mixer truck and outputs a status signal to the mode selection module (107); the mode selection module (107) transmits the mode signal to the analysis module based on the received status signal ( 102); the analysis module (102) determines the predetermined rotational speed based on the mode signal.

The constant speed control device for a mixer according to claim 5, wherein the mode selection module (107) further outputs a mode signal to the electronic control unit (200).

The constant speed control device for a mixer according to any one of claims 2 to 4, further comprising an operating mechanism (500), wherein the operating mechanism (500) is connected to the controller (100), Place The analysis module (102) of the controller (100) determines the predetermined rotational speed based on an instruction output by the steering mechanism (500).

8. The constant speed control device for a mixer according to claim 7, wherein the operating mechanism (500) comprises a remote control transmitting device (510) and a remote control receiving device (520), and the remote control receiving device (520) And outputting an instruction to the analysis module (102) of the controller (100) according to a signal transmitted by the remote control transmitting device (510).

A mixer truck comprising an engine (10) and a control device, wherein the control device is the constant speed control device for a mixer truck according to any one of claims 1-8, wherein the engine (10) and The hydraulic pump (20) is connected.

A method for controlling a constant rotation speed of a mixing drum, comprising the steps of: detecting an actual rotation speed of the engine (10);

Determining a predetermined displacement of the hydraulic pump (20) according to the actual rotational speed and a predetermined rotational speed of the mixing drum (40); the hydraulic pump (20) providing hydraulic power to a hydraulic motor (30) that drives the mixing drum (40) to rotate;

The displacement of the hydraulic pump (20) is adjusted according to the predetermined displacement.

11. A method of controlling a constant speed of a mixing drum according to claim 10, wherein the output signal detects the actual speed of the engine (10).