Calibration method and device for mixing drum, mixing truck and storage medium

Abstract

The embodiment of the invention provides a calibration method and device for a mixing drum, a mixing truck and a storage medium. The method is applied to the mixer truck, the mixer truck comprises an engine, a mixing drum pump, a hydraulic motor, a mixing drum and an electromagnetic proportional valve, and the electromagnetic proportional valve is used for adjusting the rotating speed of the hydraulic motor to adjust the rotating speed of the mixing drum. The PWM signal output to the electromagnetic proportional valve is gradually increased, so that the stirring barrel is accelerated to the first maximum rotating speed in the rotating direction from the static state; in the process of accelerating the mixing drum to the first maximum rotating speed, recording PWM signal values corresponding to a plurality of first target rotating speeds of the mixing drum; the PWM signal value output to the electromagnetic proportional valve is kept at the maximum value, and the rotating speed of the engine is gradually increased so that the stirring barrel can be accelerated to the preset rotating speed from the first maximum rotating speed; and in the process that the mixing drum is accelerated from the first maximum rotating speed to the preset rotating speed, engine rotating speed values corresponding to the multiple second target rotating speeds of the mixing drum are recorded.

Description

Technical Field

[0001] The present application relates to the technical field of engineering machinery, and in particular to a calibration method and device for a mixing drum, a mixing truck and a storage medium. Background Art

[0002] The speed of the mixing drum of existing concrete mixer trucks changes with the change of engine speed. Especially during driving, the mixer drum cannot maintain constant speed stirring under different engine speed conditions. For safety reasons, it is not advisable to rotate the drum quickly when overloaded. The working characteristics of the mixing drum solenoid valve installed on the constant speed drum change with time, resulting in poor constant speed drum performance of the mixing drum and higher fuel consumption of the vehicle.

[0003] When the mixer truck is driving fast, the fast stirring drum is not conducive to safe transportation. The mixer drum is rarely equipped with a constant speed drum, and the constant speed control after configuration is not ideal, which is not fuel-efficient. In addition, after the mixer truck has been used for a period of time, the constant speed characteristics deteriorate, and customers cannot manually calibrate the constant speed parameters. Service engineers need to calibrate under the guidance of technicians. The calibration operation is cumbersome, time-consuming and labor-intensive, and it is easy to cause large calibration deviations or calibration errors, resulting in the inability to maintain the constant speed of the mixer drum. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a calibration method, device, mixer truck and storage medium for a mixing drum, so as to solve the technical defects in the prior art that manual calibration of the mixing drum rotation speed leads to large calibration deviation and inability to maintain constant speed rotation of the mixing drum.

[0005] In order to achieve the above-mentioned object, the first aspect of the present application provides a calibration method for a mixing drum, which is applied to a mixing truck. The mixing truck includes an engine, a mixing drum pump, a hydraulic motor, a mixing drum, and an electromagnetic proportional valve. The electromagnetic proportional valve is used to adjust the speed of the hydraulic motor to adjust the speed of the mixing drum. The calibration method includes:

[0006] Control the engine to be in idle state;

[0007] gradually increasing the PWM signal output to the electromagnetic proportional valve so that the mixing drum accelerates from rest to a first maximum speed in a rotation direction;

[0008] During the process of accelerating the mixing drum to a first maximum speed, recording PWM signal values ​​corresponding to a plurality of first target speeds of the mixing drum;

[0009] The PWM signal value output to the electromagnetic proportional valve is maintained at a maximum value, and the engine speed is gradually increased so that the mixing drum is accelerated from a first maximum speed to a preset speed;

[0010] During the process of accelerating the mixer drum from the first maximum rotational speed to the preset rotational speed, engine rotational speed values ​​corresponding to a plurality of second target rotational speeds of the mixer drum are recorded.

[0011] In an embodiment of the present application, when the rotation direction is the forward direction, the solenoid proportional valve is a forward solenoid proportional valve, and controlling the engine to be in an idle state includes: when the mixer truck is started and in a feeding mode, controlling the engine to be in an idle state.

[0012] In an embodiment of the present application, when the rotation direction is a reverse direction, the electromagnetic proportional valve is a reverse electromagnetic proportional valve, and controlling the engine to be in an idle state includes: when the mixer truck is started and in a unloading mode, controlling the engine to be in an idle state.

[0013] In an embodiment of the present application, the calibration method further includes: a plurality of first target rotational speeds and a plurality of second target rotational speeds are integer rotational speeds of the mixing drum.

[0014] In an embodiment of the present application, the calibration method also includes: generating constant speed calibration parameters of the mixing drum based on PWM signal values ​​corresponding to multiple first target speeds and engine speed values ​​corresponding to multiple second target speeds, so that the mixing drum can achieve constant speed rotation according to the constant speed calibration parameters during the operation of the mixer truck.

[0015] In an embodiment of the present application, the mixer truck further includes a motor speed sensor installed at the hydraulic motor, and the calibration method further includes: detecting the speed of the hydraulic motor by the motor speed sensor to determine the speed of the mixer drum.

[0016] A second aspect of the present application provides a calibration device for a mixing drum, comprising:

[0017] a memory configured to store instructions;

[0018] The processor is configured to call the instructions from the memory and implement the above-mentioned calibration method for the mixing drum when executing the instructions.

[0019] The third aspect of the present application provides a mixer truck, comprising:

[0020] engine;

[0021] Mixing drum pump;

[0022] Hydraulic motor;

[0023] Mixing drum;

[0024] Solenoid proportional valve, used to adjust the speed of the hydraulic motor to adjust the speed of the mixing drum;

[0025] A speed sensor for detecting the speed of the hydraulic motor to determine the speed of the mixing drum; and

[0026] The above-mentioned calibration device for the mixing drum.

[0027] In an embodiment of the present application, the electromagnetic proportional valve includes a forward electromagnetic proportional valve and a reverse electromagnetic proportional valve. The forward electromagnetic proportional valve is used to adjust the speed of the hydraulic motor when the mixer truck is in a feeding mode to adjust the speed of the mixing drum. The reverse electromagnetic proportional valve is used to adjust the speed of the hydraulic motor when the mixer truck is in a unloading mode to adjust the speed of the mixing drum.

[0028] A fourth aspect of the present application provides a machine-readable storage medium having instructions stored thereon, which, when executed by a processor, configure the processor to execute the above-mentioned calibration method for a mixing drum.

[0029] The above technical solution controls the engine to be in an idle state; gradually increases the PWM signal output to the electromagnetic proportional valve so that the mixing drum accelerates from a stationary state to a first maximum speed in a rotation direction; in the process of accelerating the mixing drum to the first maximum speed, records the PWM signal values ​​corresponding to multiple first target speeds of the mixing drum; keeps the PWM signal value output to the electromagnetic proportional valve at the maximum value, gradually increases the engine speed so that the mixing drum accelerates from the first maximum speed to a preset speed; in the process of accelerating the mixing drum from the first maximum speed to the preset speed, records the engine speed values ​​corresponding to multiple second target speeds of the mixing drum. Thus, the mixing drum speed is accurately calibrated to achieve constant speed rotation of the mixing drum during the operation of the mixer truck.

[0030] Other features and advantages of the embodiments of the present application will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present application, but do not constitute a limitation on the embodiments of the present application. In the accompanying drawings:

[0032] Figure 1 A schematic diagram of a flow chart of a calibration method for a mixing drum according to an embodiment of the present application is schematically shown;

[0033] Figure 2 The internal structure diagram of a computer device according to an embodiment of the present application is schematically shown. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. It should be understood that the specific implementation methods described herein are only used to illustrate and explain the embodiments of the present application, and are not used to limit the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0035] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0036] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0037] Figure 1 The following schematically shows a flow chart of a method for calibrating a mixing drum according to an embodiment of the present application. Figure 1 As shown, an embodiment of the present application provides a calibration method for a mixing drum, which can be applied to a mixer truck. The mixer truck includes an engine, a mixing drum pump, a hydraulic motor, a mixing drum and an electromagnetic proportional valve. The electromagnetic proportional valve is used to adjust the speed of the hydraulic motor to adjust the speed of the mixing drum. The calibration method may include the following steps.

[0038] Step 101, controlling the engine to be in an idle state.

[0039] In the embodiments of the present application, it should be noted that the engine idle state may refer to a state in which the engine is running at the lowest stable speed without outputting power to the outside. Specifically, the technical solution can start the engine and trigger the calibration enable button by turning on the key, and turn off the remote throttle to put the engine in an idle state. Among them, the remote throttle is a device that can control the engine throttle opening at a long distance to adjust the engine speed, usually through cables or other electronic signal transmission methods.

[0040] Step 102, gradually increasing the PWM signal output to the electromagnetic proportional valve, so that the mixing drum is accelerated from a stationary state in a rotation direction to a first maximum rotation speed.

[0041] In the embodiment of the present application, it should be noted that the PWM signal refers to a pulse width modulation signal, which is a method of controlling or simulating a signal by changing the width (duty cycle) of a pulse signal. The PWM signal consists of a series of periodic pulses, each pulse consisting of a high level and a low level, and the proportion of the high level is called the duty cycle. By adjusting the duty cycle, the PWM signal can achieve approximate or precise control of the analog signal. In the technical solution of this machine, the electromagnetic proportional valve is used to adjust the speed of the hydraulic motor to adjust the speed of the mixing drum. Therefore, the speed of the hydraulic motor can be adjusted by controlling the PWM signal input to the electromagnetic proportional valve to adjust the speed of the mixing drum. Specifically, the PWM signal output to the electromagnetic proportional valve is gradually increased so that the mixing drum starts from rest and accelerates in a rotation direction to the first maximum speed. The first maximum speed can be set according to the actual scenario in combination with the specifications of the mixing drum. In the technical solution, the first maximum speed should be the speed value when the speed of the mixing drum no longer increases with the increase of the PWM signal of the electromagnetic proportional valve. For example, in the technical solution, it can include but is not limited to being set to 5rpm, rpm is the unit of speed, indicating the number of rotations per minute.

[0042] In an embodiment of the present application, when the rotation direction is the forward direction, the solenoid proportional valve is a forward solenoid proportional valve, and controlling the engine to be in an idle state includes: when the mixer truck is started and in a feeding mode, controlling the engine to be in an idle state.

[0043] In this embodiment, it should be noted that the rotation direction of the mixing drum can be divided into a forward rotation direction and a reverse rotation direction. When the rotation direction of the mixing drum is the forward rotation direction, the electromagnetic proportional valve used to drive the hydraulic motor is a forward electromagnetic proportional valve. At this time, it can be considered that the mixer truck is in the feeding mode. When the mixer truck is in the feeding mode, the key can be turned on to start the engine and trigger the calibration enable button, and the remote throttle is turned off to make the engine idle.

[0044] In an embodiment of the present application, when the rotation direction is a reverse direction, the solenoid proportional valve is a reverse solenoid proportional valve, and controlling the engine to be in an idle state includes: when the mixer truck is started and in a unloading mode, controlling the engine to be in an idle state.

[0045] In this embodiment, it should be noted that the rotation direction of the mixing drum can be divided into a forward rotation direction and a reverse rotation direction. When the rotation direction of the mixing drum is a reverse rotation direction, the electromagnetic proportional valve used to drive the hydraulic motor is a reverse electromagnetic proportional valve. At this time, it can be considered that the mixer truck is in the unloading mode. When the mixer truck is in the feeding mode, the key can be turned on to start the engine and trigger the calibration enable button, and the remote throttle is turned off to make the engine idle.

[0046] Step 103 : When the mixing drum is accelerated to a first maximum rotation speed, the PWM signal values ​​corresponding to a plurality of first target rotation speeds of the mixing drum are recorded.

[0047] In the embodiment of the present application, it should be noted that the PWM value refers to the duty cycle of pulse width modulation (PWM), which indicates the ratio of the high level time to the entire cycle time within a pulse cycle. The range of PWM values ​​is usually between 10% and 90%, and is used to control parameters such as the speed or brightness of the device. In the present technical solution, a PID closed-loop control can be used based on each first target drum speed of the mixing drum and the first actual drum speed of the mixing drum at each first target drum speed to control the PWM signal input to the electromagnetic proportional valve, so as to achieve each first actual drum speed equal to each corresponding first target drum speed, so that the PWM signal value corresponding to each first target speed can be obtained. The PWM signal values ​​corresponding to the multiple first target speeds of the mixing drum are recorded, thereby completing the calibration of the electromagnetic proportional valve and the speed of the mixing drum part at the engine idle speed. For example, when the first maximum speed of the mixing drum is 5rpm, the multiple first target speeds can be 1rpm, 2rpm, 3rpm, 4rpm and 5rpm respectively, and the PWM signal values ​​corresponding to the electromagnetic proportional valve can be PWM1, PWM2, PWM3, PWM4 and PWM5 respectively.

[0048] In an embodiment of the present application, the mixer truck further includes a motor speed sensor installed at the hydraulic motor, and the calibration method further includes: detecting the speed of the hydraulic motor by the motor speed sensor to determine the speed of the mixer drum.

[0049] In the present embodiment, it should be noted that the mixer truck also includes a motor speed sensor installed at the hydraulic motor. In the present technical solution, the speed of the hydraulic motor is adjusted by controlling the electromagnetic proportional valve to adjust the speed of the mixing drum. Therefore, the speed of the hydraulic motor can be detected by collecting the motor speed sensor installed at the hydraulic motor, thereby obtaining the speed of the mixing drum.

[0050] Step 104 , maintaining the PWM signal value output to the electromagnetic proportional valve at a maximum value, and gradually increasing the engine speed so that the mixing drum is accelerated from a first maximum speed to a preset speed.

[0051] In the embodiment of the present application, it should be noted that the preset speed may refer to the rated maximum speed of the mixing drum, which may be set according to the actual specifications of the mixing drum. For example, in the present technical solution, it may include but is not limited to being set to 16 rpm. Since the maximum value of the PWM signal value of the electromagnetic proportional valve corresponds to the first maximum speed of the mixing drum, the PWM signal value output to the electromagnetic proportional valve is maintained at the maximum value, and the remote throttle switch is turned on to adjust the speed of the engine. The speed of the engine is gradually increased so that the mixing drum is accelerated from the first maximum speed to the preset speed.

[0052] Step 105 , during the process of accelerating the mixer drum from the first maximum speed to the preset speed, recording the engine speed values ​​corresponding to a plurality of second target speeds of the mixer drum.

[0053] In the embodiment of the present application, it should be noted that the preset speed may refer to the rated maximum speed of the mixing drum. Taking the first maximum speed as 5rpm and the preset speed as 16rpm as an example, the multiple second target speeds may be 6rpm, 7rpm, 8rpm, 9rpm, 10rpm, 11rpm, 12rpm, 13rpm, 14rpm, 15rpm and 16rpm respectively. In the process of accelerating the mixing drum from the first maximum speed to the preset speed, the speed value of the engine is continuously adjusted to achieve that the actual speed of the mixing drum at each second target speed is equal to the corresponding second target speed, so that the engine speed value corresponding to each second target speed can be obtained. The engine speed values ​​corresponding to the multiple second target speeds of the mixing drum are recorded, thereby completing the calibration of the remaining speeds of the engine and the mixing drum. For example, taking multiple second target speeds of 6rpm, 7rpm, 8rpm, 9rpm, 10rpm, 11rpm, 12rpm, 13rpm, 14rpm, 15rpm and 16rpm as examples, the corresponding engine speed values ​​of the engine can be V1, V2, V3, V4, V5, V6, V7, V8, V9, V10 and V11 respectively.

[0054] In an embodiment of the present application, the calibration method further includes: a plurality of first target rotational speeds and a plurality of second target rotational speeds are integer rotational speeds of the mixing drum.

[0055] In this embodiment, it should be noted that the multiple first target speeds and the multiple second target speeds are integer speeds of the mixing drum. Specifically, taking the first maximum speed of 5rpm and the preset speed of 16rpm as an example, the multiple first target speeds can be 1rpm, 2rpm, 3rpm, 4rpm and 5rpm respectively, and the multiple second target speeds can be 6rpm, 7rpm, 8rpm, 9rpm, 10rpm, 11rpm, 12rpm, 13rpm, 14rpm, 15rpm and 16rpm respectively.

[0056] In an embodiment of the present application, the calibration method also includes: generating constant speed calibration parameters of the mixing drum based on PWM signal values ​​corresponding to multiple first target speeds and engine speed values ​​corresponding to multiple second target speeds, so that the mixing drum can achieve constant speed rotation according to the constant speed calibration parameters during the operation of the mixer truck.

[0057] In this embodiment, it should be noted that after obtaining the PWM signal values ​​corresponding to the multiple first target speeds and the engine speed values ​​corresponding to the multiple second target speeds, the electromagnetic proportional valve and the engine have been calibrated. Therefore, the constant speed calibration parameters of the mixing drum can be further generated based on the PWM signal values ​​corresponding to the multiple first target speeds and the engine speed values ​​corresponding to the multiple second target speeds, so that the mixing drum can achieve constant speed rotation during the operation of the mixer truck according to the constant speed calibration parameters.

[0058] The above technical solution controls the engine to be in an idle state; gradually increases the PWM signal output to the electromagnetic proportional valve so that the mixing drum accelerates from a stationary state to a first maximum speed in a rotation direction; in the process of accelerating the mixing drum to the first maximum speed, records the PWM signal values ​​corresponding to multiple first target speeds of the mixing drum; keeps the PWM signal value output to the electromagnetic proportional valve at the maximum value, gradually increases the engine speed so that the mixing drum accelerates from the first maximum speed to a preset speed; in the process of accelerating the mixing drum from the first maximum speed to the preset speed, records the engine speed values ​​corresponding to multiple second target speeds of the mixing drum. Thus, the mixing drum speed is accurately calibrated to achieve constant speed rotation of the mixing drum during the operation of the mixer truck.

[0059] This technical solution automatically maintains the mixing drum at a constant speed by matching the engine speed to improve the concrete mixing quality. It automatically calibrates the electromagnetic proportional valve opening value and engine speed value at each drum speed, without manual operation, improving the calibration accuracy and efficiency. The calibration of the forward and reverse electromagnetic valve and engine speed can be completed with one click, without other operations, which is convenient and simple. The feasibility of calibration is increased, and users can calibrate by themselves without difficulty and learning cost.

[0060] The present application provides a calibration device for a mixing drum, comprising:

[0061] a memory configured to store instructions;

[0062] The processor is configured to call the instructions from the memory and implement the above-mentioned calibration method for the mixing drum when executing the instructions.

[0063] The present application provides a mixer truck, comprising:

[0064] engine;

[0065] Mixing drum pump;

[0066] Hydraulic motor;

[0067] Mixing drum;

[0068] Solenoid proportional valve, used to adjust the speed of the hydraulic motor to adjust the speed of the mixing drum;

[0069] A speed sensor for detecting the speed of the hydraulic motor to determine the speed of the mixing drum; and

[0070] The above-mentioned calibration device for the mixing drum.

[0071] In an embodiment of the present application, the electromagnetic proportional valve includes a forward electromagnetic proportional valve and a reverse electromagnetic proportional valve. The forward electromagnetic proportional valve is used to adjust the speed of the hydraulic motor when the mixer truck is in a feeding mode to adjust the speed of the mixing drum. The reverse electromagnetic proportional valve is used to adjust the speed of the hydraulic motor when the mixer truck is in a unloading mode to adjust the speed of the mixing drum.

[0072] An embodiment of the present application provides a machine-readable storage medium, on which instructions are stored. When the instructions are executed by a processor, the processor is configured to execute the above-mentioned calibration method for a mixing drum.

[0073] In one embodiment, a computer device is provided. The computer device may be a server, and its internal structure diagram may be as follows: Figure 2 As shown. The computer device includes a processor A01, a network interface A02, a memory (not shown in the figure) and a database (not shown in the figure) connected via a system bus. Among them, the processor A01 of the computer device is used to provide computing and control capabilities. The memory of the computer device includes an internal memory A03 and a non-volatile storage medium A04. The non-volatile storage medium A04 stores an operating system B01, a computer program B02 and a database (not shown in the figure). The internal memory A03 provides an environment for the operation of the operating system B01 and the computer program B02 in the non-volatile storage medium A04. The database of the computer device is used to store calibration method data for a mixing drum. The network interface A02 of the computer device is used to communicate with an external terminal via a network connection. When the computer program B02 is executed by the processor A01, a calibration method for a mixing drum is implemented.

[0074] Those skilled in the art will understand that Figure 2The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0075] An embodiment of the present application provides a device, which includes a processor, a memory, and a program stored in the memory and executable on the processor. When the processor executes the program, the following steps are implemented: controlling the engine to be in an idle state; gradually increasing the PWM signal output to the electromagnetic proportional valve so that the mixing drum accelerates from a stationary state to a first maximum speed in a rotation direction; in the process of accelerating the mixing drum to the first maximum speed, recording the PWM signal values ​​corresponding to multiple first target speeds of the mixing drum; maintaining the PWM signal value output to the electromagnetic proportional valve at a maximum value, and gradually increasing the engine speed so that the mixing drum accelerates from the first maximum speed to a preset speed; in the process of accelerating the mixing drum from the first maximum speed to the preset speed, recording the engine speed values ​​corresponding to multiple second target speeds of the mixing drum.

[0076] In one embodiment, when the rotation direction is forward, the electromagnetic proportional valve is a forward electromagnetic proportional valve, and controlling the engine to be in an idle state includes: when the mixer truck is started and in a feeding mode, controlling the engine to be in an idle state.

[0077] In one embodiment, when the rotation direction is the reverse direction, the electromagnetic proportional valve is a reverse electromagnetic proportional valve, and controlling the engine to be in an idle state includes: when the mixer truck is started and in a unloading mode, controlling the engine to be in an idle state.

[0078] In one embodiment, the calibration method further includes: a plurality of first target rotational speeds and a plurality of second target rotational speeds are integer rotational speeds of the mixing drum.

[0079] In one embodiment, the calibration method also includes: generating constant speed calibration parameters of the mixing drum based on PWM signal values ​​corresponding to multiple first target speeds and engine speed values ​​corresponding to multiple second target speeds, so that the mixing drum can achieve constant speed rotation according to the constant speed calibration parameters during the operation of the mixer truck.

[0080] In one embodiment, the mixer truck further includes a motor speed sensor installed at the hydraulic motor, and the calibration method further includes: detecting the speed of the hydraulic motor by the motor speed sensor to determine the speed of the mixer drum.

[0081] The present application also provides a computer program product, which, when executed on a data processing device, is suitable for executing a program that is initialized with the following method steps: controlling the engine to be in an idle state; gradually increasing the PWM signal output to the electromagnetic proportional valve so that the mixing drum accelerates from a stationary state in a rotation direction to a first maximum speed; in the process of accelerating the mixing drum to the first maximum speed, recording the PWM signal values ​​corresponding to multiple first target speeds of the mixing drum; maintaining the PWM signal value output to the electromagnetic proportional valve at a maximum value, and gradually increasing the engine speed so that the mixing drum accelerates from the first maximum speed to a preset speed; in the process of accelerating the mixing drum from the first maximum speed to the preset speed, recording the engine speed values ​​corresponding to multiple second target speeds of the mixing drum.

[0082] In one embodiment, when the rotation direction is forward, the electromagnetic proportional valve is a forward electromagnetic proportional valve, and controlling the engine to be in an idle state includes: when the mixer truck is started and in a feeding mode, controlling the engine to be in an idle state.

[0083] In one embodiment, when the rotation direction is the reverse direction, the electromagnetic proportional valve is a reverse electromagnetic proportional valve, and controlling the engine to be in an idle state includes: when the mixer truck is started and in a unloading mode, controlling the engine to be in an idle state.

[0084] In one embodiment, the calibration method further includes: a plurality of first target rotational speeds and a plurality of second target rotational speeds are integer rotational speeds of the mixing drum.

[0085] In one embodiment, the calibration method also includes: generating constant speed calibration parameters of the mixing drum based on PWM signal values ​​corresponding to multiple first target speeds and engine speed values ​​corresponding to multiple second target speeds, so that the mixing drum can achieve constant speed rotation according to the constant speed calibration parameters during the operation of the mixer truck.

[0086] In one embodiment, the mixer truck further includes a motor speed sensor installed at the hydraulic motor, and the calibration method further includes: detecting the speed of the hydraulic motor by the motor speed sensor to determine the speed of the mixer drum.

[0087] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0088] The present application is described with reference to flowcharts and / or block diagrams of methods, devices (systems) and computer program products according to embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0089] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0090] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0091] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0092] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0093] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0094] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0095] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A method for calibrating a mixing drum, characterized in that: Applied to a mixer truck, the mixer truck includes an engine, a mixer drum pump, a hydraulic motor, a mixer drum and an electromagnetic proportional valve, the electromagnetic proportional valve is used to adjust the speed of the hydraulic motor to adjust the speed of the mixer drum, and the calibration method includes: Controlling the engine to be in an idle state; gradually increasing the PWM signal output to the electromagnetic proportional valve so that the mixing drum accelerates from rest to a first maximum speed in a rotation direction; During the process of accelerating the mixing drum to the first maximum speed, recording PWM signal values ​​corresponding to a plurality of first target speeds of the mixing drum; The PWM signal value output to the electromagnetic proportional valve is maintained at a maximum value, and the speed of the engine is gradually increased so that the mixing drum is accelerated from the first maximum speed to a preset speed; During the process of accelerating the mixer drum from the first maximum speed to a preset speed, engine speed values ​​corresponding to a plurality of second target speeds of the mixer drum are recorded.

2. The calibration method for a mixing drum according to claim 1, characterized in that: When the rotation direction is the forward rotation direction, the electromagnetic proportional valve is a forward rotation electromagnetic proportional valve, and the controlling the engine to be in an idle state includes: When the mixer truck is started and in a feeding mode, the engine is controlled to be in an idling state.

3. The calibration method for a mixing drum according to claim 1, characterized in that: When the rotation direction is a reverse direction, the electromagnetic proportional valve is a reverse electromagnetic proportional valve, and the controlling the engine to be in an idle state includes: When the mixer truck is started and in a discharging mode, the engine is controlled to be in an idling state.

4. The calibration method for a mixing drum according to claim 1, characterized in that: The calibration method further comprises: The plurality of first target rotational speeds and the plurality of second target rotational speeds are integer rotational speeds of the mixing drum.

5. The calibration method for a mixing drum according to claim 1, characterized in that: The calibration method further comprises: Based on the PWM signal values ​​corresponding to the multiple first target speeds and the engine speed values ​​corresponding to the multiple second target speeds, the constant speed calibration parameters of the mixer drum are generated so that the mixer drum can achieve constant speed rotation according to the constant speed calibration parameters during the operation of the mixer truck.

6. The calibration method for a mixing drum according to claim 1, characterized in that: The mixer truck further includes a motor speed sensor installed at the hydraulic motor, and the calibration method further includes: The rotation speed of the hydraulic motor is detected by the motor rotation speed sensor to determine the rotation speed of the mixing drum.

7. A control device for a mixing drum, characterized in that: include: a memory configured to store instructions; A processor is configured to call the instructions from the memory and implement the calibration method for a mixing drum according to any one of claims 1 to 6 when executing the instructions.

8. A mixer truck, characterized in that: include: engine; Mixing drum pump; Hydraulic motor; Mixing drum; An electromagnetic proportional valve, used to adjust the speed of the hydraulic motor to adjust the speed of the mixing drum; A rotation speed sensor, used to detect the rotation speed of the hydraulic motor to determine the rotation speed of the mixing drum; as well as A control device for a mixing drum according to claim 7.

9. The mixer truck according to claim 8, characterized in that: The electromagnetic proportional valve includes a forward electromagnetic proportional valve and a reverse electromagnetic proportional valve. The forward electromagnetic proportional valve is used to adjust the speed of the hydraulic motor when the mixer truck is in a feeding mode to adjust the speed of the mixing drum. The reverse electromagnetic proportional valve is used to adjust the speed of the hydraulic motor when the mixer truck is in a unloading mode to adjust the speed of the mixing drum.

10. A machine-readable storage medium having instructions stored thereon, characterized in that: When the instructions are executed by a processor, the processor is configured to perform a calibration method for a mixing drum according to any one of claims 1 to 6.

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