Control method and device of mixer truck and mixer truck

Abstract

The present disclosure relates to a control method and device of a mixer truck and the mixer truck, and relates to the field of vehicle control. The method comprises: receiving a rotating speed adjustment instruction, the rotating speed adjustment instruction being used to indicate a target rotating speed of a mixing drum of the mixer truck. According to the target rotating speed, a target control rotating speed of an engine of the mixer truck and a target gear of a gearbox of the mixer truck are determined. The engine is controlled to operate at the target control rotating speed, and the gearbox is adjusted to the target gear. The engine is used to transmit torque to the gearbox, and the gearbox is used to transmit the torque to the mixing drum through a transmission device, so that the mixing drum rotates at the target rotating speed. According to the present disclosure, the engine is controlled to operate at the target control rotating speed to transmit torque to the gearbox, and the gearbox is controlled to transmit the torque to the mixing drum at the target gear, so that the mixing drum is controlled to rotate at the target rotating speed. In this way, the engine can be controlled to rotate at a high speed while ensuring that the rotating speed of the engine is in an economic rotating speed range, and fuel consumption of the engine is reduced.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the field of vehicle control, in particular, to a control method and device of a mixer truck and the mixer truck. BACKGROUND

[0002] A concrete mixer truck, referred to as a mixer truck, is a special vehicle widely used in the engineering construction industry. During vehicle transportation, the mixer truck continuously rotates the mixing drum at a uniform speed to ensure the construction performance of the pre-mixed concrete in the mixing drum and prevent the segregation of the concrete. The mixer truck can also complete loading and unloading by controlling the forward and reverse rotation of the mixing drum. During mixing or unloading, the mixing drum sometimes needs to rotate at a high speed, at which time the engine speed needs to be increased to ensure high-speed rotation of the mixing drum. Since the engine speed is high at this time, the engine works in a non-economic speed range, resulting in poor fuel economy of the engine and reducing the energy utilization rate. SUMMARY

[0003] The purpose of the present disclosure is to provide a control method and device of a mixer truck and the mixer truck for improving the energy utilization rate.

[0004] According to a first aspect of an embodiment of the present disclosure, a control method of a mixer truck is provided, the method comprising:

[0005] receiving a speed adjustment instruction, the speed adjustment instruction being used to indicate a target speed of a mixing drum of the mixer truck;

[0006] determining a target control speed of an engine of the mixer truck and a target gear of a gearbox of the mixer truck according to the target speed;

[0007] controlling the engine to operate at the target control speed and adjusting the gearbox to the target gear, the engine being used to transmit torque to the gearbox, the gearbox being used to transmit torque to the mixing drum through a transmission device, so that the mixing drum rotates at the target speed.

[0008] Optionally, the determining the target control speed of the engine of the mixer truck and the target gear of the gearbox of the mixer truck according to the target speed comprises:

[0009] determining a required control speed according to the target speed and a transmission ratio of the transmission device;

[0010] determining the target control speed and the target gear according to the required control speed.

[0011] Optionally, the determining the target control speed and the target gear according to the required control speed comprises:

[0012] if the demand control speed is less than or equal to a preset speed threshold, determining the target control speed as the demand control speed, and determining the target gear as an initial gear of the gearbox;

[0013] if the demand control speed is greater than the speed threshold, determining the target control speed and the target gear according to the demand control speed and the speed threshold.

[0014] Optionally, the step of determining the target control speed and the target gear according to the demand control speed and the speed threshold if the demand control speed is greater than the speed threshold, comprises:

[0015] determining a ratio of the demand control speed and the speed threshold;

[0016] determining a gear with a smallest transmission ratio among gears with transmission ratios greater than the ratio in the gearbox as the target gear;

[0017] determining a ratio of the demand control speed and the transmission ratio of the target gear as the target control speed.

[0018] Optionally, the step of adjusting the gearbox to the target gear, comprises:

[0019] controlling the gearbox to adjust one gear;

[0020] if a difference between the current speed of the mixing drum and a speed corresponding to the last gear adjustment is a preset step value, controlling the gearbox to adjust one gear;

[0021] repeating the step of controlling the gearbox to adjust one gear if the difference between the current speed of the mixing drum and the speed corresponding to the last gear adjustment is the preset step value, until the gear of the gearbox is the target gear.

[0022] Optionally, the step of controlling the engine to operate at the target control speed and adjusting the gearbox to the target gear, comprises:

[0023] if the target speed is greater than the current speed of the mixing drum, controlling the gear of the gearbox to increase, and controlling the engine to decrease from a current control speed to a first specified speed;

[0024] controlling the engine to increase from the first specified speed to the target control speed;

[0025] if the target speed is less than the current speed of the mixing drum, controlling the gear of the gearbox to decrease, and controlling the engine to increase from the current control speed to a second specified speed;

[0026] controlling the engine to decrease from the second specified rotational speed to the target control rotational speed.

[0027] According to a second aspect of embodiments of the present disclosure, a control device of a mixer truck is provided, the device comprising:

[0028] a receiving module configured to receive a rotational speed adjustment instruction, the rotational speed adjustment instruction being configured to indicate a target rotational speed of a mixing drum of the mixer truck;

[0029] a determining module configured to determine, according to the target rotational speed, a target control rotational speed of an engine of the mixer truck and a target gear of a transmission of the mixer truck;

[0030] a control module configured to control the engine to operate at the target control rotational speed and adjust the transmission to the target gear, the engine being configured to transmit torque to the transmission, and the transmission being configured to transmit torque to the mixing drum through a transmission device to rotate the mixing drum at the target rotational speed.

[0031] Optionally, the determining module is configured to:

[0032] determine a demand control rotational speed according to the target rotational speed and a transmission ratio of the transmission device;

[0033] determine the target control rotational speed and the target gear according to the demand control rotational speed.

[0034] Optionally, the determining module is configured to:

[0035] if the demand control rotational speed is less than or equal to a preset rotational speed threshold, determine the target control rotational speed as the demand control rotational speed and determine the target gear as an initial gear of the transmission;

[0036] if the demand control rotational speed is greater than the rotational speed threshold, determine the target control rotational speed and the target gear according to the demand control rotational speed and the rotational speed threshold.

[0037] Optionally, the determining module is configured to:

[0038] determine a ratio of the demand control rotational speed and the rotational speed threshold;

[0039] determine, as the target gear, a gear with a transmission ratio smaller than the ratio among gears with transmission ratios greater than the ratio in the transmission;

[0040] determine, as the target control rotational speed, a ratio of the demand control rotational speed and the transmission ratio of the target gear.

[0041] Optionally, the control module is configured to:

[0042] controlling the gearbox to adjust one gear position;

[0043] if a difference between the current rotating speed of the mixing drum and the rotating speed corresponding to the last gear position adjustment is a preset step value, controlling the gearbox to adjust one gear position;

[0044] repeating the step of if a difference between the current rotating speed of the mixing drum and the rotating speed corresponding to the last gear position adjustment is a preset step value, controlling the gearbox to adjust one gear position until the gear position of the gearbox is the target gear position.

[0045] Optionally, the control module is configured to:

[0046] if the target rotating speed is greater than the current rotating speed of the mixing drum, controlling the gear position of the gearbox to be raised and controlling the engine to be lowered from the current control rotating speed to a first specified rotating speed;

[0047] controlling the engine to be raised from the first specified rotating speed to the target control rotating speed;

[0048] if the target rotating speed is less than the current rotating speed of the mixing drum, controlling the gear position of the gearbox to be lowered and controlling the engine to be raised from the current control rotating speed to a second specified rotating speed;

[0049] controlling the engine to be lowered from the second specified rotating speed to the target control rotating speed.

[0050] According to a third aspect of the embodiments of the present disclosure, a mixer truck is provided, which is configured to perform the control method of the mixer truck according to any one of the first aspect of the present disclosure.

[0051] According to the above technical solution, the mixer truck first receives a rotating speed adjustment instruction, and determines a target control rotating speed of the engine of the mixer truck and a target gear position of the gearbox of the mixer truck according to a target rotating speed indicated by the rotating speed adjustment instruction. Then the engine is controlled to operate at the target control rotating speed, and the gearbox is adjusted to the target gear position. The engine is configured to transmit torque to the gearbox, and the gearbox is configured to transmit the torque to the mixing drum through a transmission device, so that the mixing drum rotates at the target rotating speed. According to the target rotating speed of the mixing drum, the engine is controlled to operate at the target control rotating speed to transmit torque to the gearbox, and the gearbox is controlled to transmit torque to the mixing drum at the target gear position, so that the mixing drum is controlled to rotate at the target rotating speed. On the premise that the rotating speed of the engine is in the economic rotating speed interval, the mixing drum is controlled to rotate at a high speed, the fuel consumption of the engine is reduced, and the energy utilization rate is improved.

[0052] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF DRAWINGS

[0053] The accompanying drawings are included to provide a further understanding of the disclosure and constitute a part of the specification, illustrate the disclosure and are used to explain the disclosure together with the specific embodiments described below, but do not constitute a limitation on the disclosure. In the drawings:

[0054] Figure 1 is a flow chart of a control method of a mixer truck according to an exemplary embodiment;

[0055] Figure 2 is a schematic diagram of an engine power take-off mode according to an exemplary embodiment; Figure 1

[0056] Figure 3 is a flow chart of a control method of a mixer truck according to an exemplary embodiment;

[0057] Figure 4 is a flow chart of a control method of a mixer truck according to an exemplary embodiment;

[0058] Figure 5 is a flow chart of a control method of a mixer truck according to an exemplary embodiment;

[0059] Figure 6 is a flow chart of a control method of a mixer truck according to an exemplary embodiment;

[0060] Figure 7 is a block diagram of a control device of a mixer truck according to an exemplary embodiment. DETAILED DESCRIPTION

[0061] The exemplary embodiments will be described in detail below with reference to the accompanying drawings. In the following description, the same numbers refer to the same elements throughout the drawings, unless otherwise represented. The embodiments described in the following exemplary embodiments do not represent all the embodiments consistent with the present disclosure. Rather, they are merely examples of devices and methods consistent with some aspects of the present disclosure, as detailed in the appended claims.

[0062] Figure 1 is a flow chart of a control method of a mixer truck according to an exemplary embodiment, as shown in Figure 1 the method can include:

[0063] Step 101, receiving a speed adjustment instruction, the speed adjustment instruction being used to indicate a target speed of a mixing drum of the mixer truck.

[0064] For example, the mixer truck currently configured with a diesel engine chassis usually adopts an engine PTO (Power Take Off) power take-off mode. As Figure 2 ​As shown, the torque output by the engine is transmitted to the hydraulic oil pump through the transmission shaft by taking power from the engine, the hydraulic oil pump delivers hydraulic oil in the circuit into the hydraulic motor, the hydraulic motor converts the oil pressure of the hydraulic oil into rotating torque, and provides driving force for the mixing drum through the speed reducer to drive the mixing drum to rotate. And, the speed control of the mixing drum can be realized by adjusting the speed of the engine and the displacement opening of the hydraulic oil pump. Further, the rotation direction of the hydraulic motor and the speed reducer can be controlled by controlling the oil way of the hydraulic oil pump, so as to realize the forward and reverse rotation of the mixing drum, and realize the feeding and discharging working process.

[0065] However, since the transmission ratio of the engine PTO power taking mode is a fixed value 1:1, when the mixing drum needs to rotate at high speed, the engine speed needs to be increased to the non-economic speed range under the condition that the displacement opening of the hydraulic oil pump is maximum, so as to ensure that the mixing drum reaches the required speed, thereby causing poor fuel economy of the engine and reducing the energy utilization rate. The transmission ratio of the transmission box PTO power taking mode adopted by the present disclosure can control the mixing drum to rotate at the target speed, and the mixing drum can rotate at high speed under the premise that the engine speed is in the economic speed range, thereby reducing the fuel consumption of the engine and improving the energy utilization rate.

[0066] The application scenario of the present disclosure can be an automatic gear mixer truck in a stationary state, and the execution subject of the present disclosure can be a controller arranged on the mixer truck, which can be connected with the engine controller and the transmission box controller through a bus respectively. The transmission box on the mixer truck can be an automatic transmission box, and the transmission box can be provided with two output shafts for driving the mixer truck to travel and driving the mixing drum to rotate respectively. The output shaft for driving the mixing drum to rotate is connected with a transmission device, and the transmission device is connected with the mixing drum, so that the engine transmits torque to the transmission box, the output shaft of the transmission box for driving the mixing drum to rotate transmits torque to the mixing drum, so as to make the mixing drum rotate at the target speed. The bus can be a CAN (English: Controller Area Network, Chinese: Controller Area Network) bus, a LIN (English: Local Interconnect Network, Chinese: Internal Interconnection Network) bus, etc.

[0067] Firstly, the staff can trigger the speed regulation instruction by operating the device to send the speed regulation instruction to the controller, wherein the speed regulation instruction is used to indicate the target speed of the mixing drum of the mixer truck. The operating device can be a terminal device bound with the mixer truck, and the speed regulation instruction indicating the target speed is triggered through physical buttons or virtual buttons on the terminal device. The terminal device can include but is not limited to mobile terminals such as mobile phones, notebook computers, digital broadcast receivers, PDAs (personal digital assistants), PADs (tablet computers), PMPs (portable multimedia players), vehicle-mounted terminals (such as vehicle-mounted navigation terminals), and the like, and fixed terminals such as digital TVs, desktop computers, and the like. The operating device can also be a mechanical device provided with a knob, a gear or a button, etc., and the speed regulation instruction indicating the target speed is triggered by adjusting the knob, the gear or the button, etc. The present disclosure does not make specific limitations in this regard.

[0068] In step 102, according to the target speed, the target control speed of the engine of the mixer truck and the target gear of the gearbox of the mixer truck are determined.

[0069] In step 103, the engine is controlled to operate at the target control speed, and the gearbox is adjusted to the target gear. The engine is used to transmit torque to the gearbox, and the gearbox is used to transmit torque to the mixing drum through the transmission device to make the mixing drum rotate at the target speed.

[0070] For example, after receiving the speed regulation instruction, the speed regulation instruction can be parsed to obtain the target speed indicated by the speed regulation instruction. Then, according to the target speed, the target control speed of the engine of the mixer truck and the target gear of the gearbox of the mixer truck are determined. Since the torque output by the gearbox can drive the mixing drum to rotate through the conversion of the transmission device, and the target speed is in a proportional relationship with the speed of the output shaft of the gearbox, the demand control speed of the output shaft of the gearbox that can make the speed of the mixing drum reach the target speed can be determined according to the target speed and the transmission ratio of the transmission device, and then the target control speed and the target gear are further determined according to the demand control speed and the economic speed range of the engine, wherein the target control speed is in the economic speed range. Thus, when the speed of the engine is the target control speed and the gearbox is in the target gear, the speed of the output shaft of the gearbox used to drive the mixing drum to rotate can make the speed of the mixing drum reach the target speed. In this way, by taking power from the gearbox, it can be ensured that when the target speed of the mixing drum is large, the speed of the engine can also be in the economic speed range, thereby reducing the fuel consumption of the engine and improving the utilization rate of energy.

[0071] Further, the controller can send the target control rotating speed to an engine controller and send the target gear to a gearbox controller, the engine controller can control the engine to operate at the target control rotating speed, and the gearbox controller can adjust the gear of the gearbox to the target gear. The torque output by the engine at the target control rotating speed can be transmitted to the gearbox, and the torque output by the gearbox at the target gear can be transmitted to the mixing drum through the transmission device, so that the mixing drum can rotate at the target rotating speed. The transmission device can include a transmission shaft, a hydraulic oil pump, a hydraulic motor, a speed reducer, etc.

[0072] In summary, the present disclosure first receives the rotating speed adjustment instruction, and determines the target control rotating speed of the engine of the mixer truck and the target gear of the gearbox of the mixer truck according to the target rotating speed indicated by the rotating speed adjustment instruction. Then the engine is controlled to operate at the target control rotating speed, and the gearbox is adjusted to the target gear. The engine is used to transmit torque to the gearbox, and the gearbox is used to transmit torque to the mixing drum through the transmission device, so that the mixing drum rotates at the target rotating speed. According to the target rotating speed of the mixing drum, the present disclosure controls the engine to operate at the target control rotating speed to transmit torque to the gearbox, and then the gearbox transmits torque to the mixing drum at the target gear, so as to control the mixing drum to rotate at the target rotating speed. On the premise of ensuring that the rotating speed of the engine is in the economic rotating speed interval, the mixing drum is controlled to rotate at high speed, the fuel consumption of the engine is reduced, and the energy utilization rate is improved.

[0073] Figure 3 is a flow chart of another control method of a mixer truck according to an exemplary embodiment, as shown in Figure 3 Step 102 can be implemented by the following steps:

[0074] Step 1021, determining the demand control rotating speed according to the target rotating speed and the transmission ratio of the transmission device.

[0075] Step 1022, determining the target control rotating speed and the target gear according to the demand control rotating speed.

[0076] According to the target rotating speed and the transmission ratio of the transmission device, the demand control rotating speed can be determined. The demand control rotating speed can be understood as the rotating speed of the output shaft of the gearbox that can make the rotating speed of the mixing drum reach the target rotating speed, that is, when the rotating speed of the output shaft of the gearbox is the demand control rotating speed, the rotating speed of the mixing drum is the target rotating speed. Specifically, the ratio of the target rotating speed and the transmission ratio of the transmission device can be taken as the demand control rotating speed. For example, the target rotating speed is 16 rpm, and the transmission ratio of the transmission device is 1 / 100, so the demand control rotating speed can be determined as 1600 rpm, that is, when the rotating speed of the output shaft of the gearbox is 1600 rpm, the rotating speed of the mixing drum can reach the target rotating speed 16 rpm.

[0077] Next, the engine speed can be controlled according to demand to determine the target control speed and target gear. Specifically, first determine if the required control speed is within the engine's economic speed range. If it is, meaning the engine can drive the mixing drum to rotate at the target speed while operating within its economic speed range, then the required control speed can be directly used as the engine's target control speed, and the initial gear of the transmission can be used as the target gear. If the required control speed is not within the engine's economic speed range, meaning the engine's operating within its economic speed range is insufficient to drive the mixing drum to rotate at the target speed, then the gear that allows the target control speed to be within the economic speed range can be used as the target gear. That is, when the target control speed is within the economic speed range, the speed of the transmission's output shaft in the target gear is the required control speed. Then, the engine's target control speed can be obtained based on the required control speed and the target gear.

[0078] Figure 4 This is a flowchart illustrating another control method for a mixer truck according to an exemplary embodiment, such as... Figure 4 As shown, step 1022 can be achieved through the following steps:

[0079] Step 1022a: If the required control speed is less than or equal to the preset speed threshold, determine the target control speed as the required control speed and determine the target gear as the initial gear of the transmission.

[0080] Step 1022b: If the required control speed is greater than the speed threshold, determine the target control speed and target gear based on the required control speed and the speed threshold.

[0081] For example, if the required control speed is less than or equal to a preset speed threshold, it means that in the initial gear of the transmission, the engine speed is within the economic speed range, which is sufficient to make the mixing drum reach the target speed. Here, the speed threshold can be understood as the maximum speed within the engine's economic speed range, for example, 1200 rpm. Then, the required control speed can be used as the engine's target control speed, and the initial gear of the transmission can be used as the target gear. The initial gear can be a gear with a transmission ratio of 1, or it can be the current gear of the transmission; this disclosure does not specifically limit this.

[0082] If the required control speed is greater than the speed threshold, it means that in the initial gear of the transmission, the engine needs to operate in a non-economic speed range to make the mixing drum reach the target speed. Therefore, it is necessary to determine the target control speed and target gear based on the required control speed and the speed threshold, so as to make the mixing drum reach the target speed while the engine's target control speed is within the economic speed range.

[0083] In an implementation, the target gear can be determined according to the demand control speed and the speed threshold, and then the target control speed can be determined according to the target gear and the demand control speed. For example, the gear ratio of the gear box is greater than or equal to the ratio of the demand control speed and the speed threshold, and the gear closest to the ratio is the target gear, and the ratio of the demand control speed and the gear ratio of the target gear is the target control speed. Specifically, taking the demand control torque as 1800 rpm, the speed threshold as 1200 rpm, the gear box having A, B, C, and D gears, the gear ratio of the A gear being 1, the gear ratio of the B gear being 1.5, the gear ratio of the C gear being 1.8, and the gear ratio of the D gear being 2 as an example, the ratio of the demand control speed and the speed threshold is 1.5, the gear ratio of the B gear, the C gear, and the D gear is greater than or equal to 1.5, and thus the B gear, which has the gear ratio closest to 1.5, is the target gear. Further, the ratio of the demand control speed and the gear ratio of the target gear is 1800 rpm ÷ 1.5 = 1200 rpm, and thus the target control speed is 1200 rpm.

[0084] In another implementation, the target control speed can be determined according to the speed threshold, and then the target gear can be determined according to the target control speed and the demand control speed. For example, the speed threshold can be the target control speed, and the gear whose gear ratio multiplied by the target control speed is equal to the demand control speed is the target gear. The present disclosure does not make specific limitations on this. Specifically, taking the demand control torque as 1800 rpm, the speed threshold as 1200 rpm, the gear box having A, B, C, and D gears, the gear ratio of the A gear being 1, the gear ratio of the B gear being 1.5, the gear ratio of the C gear being 1.8, and the gear ratio of the D gear being 2 as an example, the speed threshold 1200 rpm can be the target control speed, and since the gear ratio of the B gear multiplied by the speed threshold is 1.5 * 1200 rpm = 1800 rpm, the B gear can be the target gear.

[0085] In an application scenario, the implementation of step 1022b can be:

[0086] The ratio of the demand control speed and the speed threshold is determined.

[0087] The gear whose gear ratio is the smallest in the gears of the gear box whose gear ratio is greater than the ratio is the target gear.

[0088] The ratio of the demand control speed and the gear ratio of the target gear is the target control speed.

[0089] For example, if the demand control rotating speed is greater than the rotating speed threshold value, it indicates that the engine needs to run in the non-economical rotating speed range in the initial gear of the gearbox to make the rotating speed of the mixing drum reach the target rotating speed. Therefore, it is necessary to raise the gear of the gearbox, and the rotating speed that the engine needs to reach in the raised target gear is determined. First, the ratio of the demand control rotating speed and the rotating speed threshold value can be determined, and the ratio is compared with the transmission ratios of all gears of the gearbox to obtain one or more gears with a transmission ratio greater than the ratio, and the gear with the smallest transmission ratio in the one or more gears is determined as the target gear of the gearbox. Then, the ratio of the demand control rotating speed and the transmission ratio of the target gear can be taken as the target control rotating speed. In this way, by raising the gear of the gearbox, the rotating speed of the engine can be ensured to be in the economical rotating speed range, thereby reducing the fuel consumption of the engine and improving the energy utilization rate.

[0090] Specifically, taking the demand control torque as 1500 rpm, the rotating speed threshold value as 1200 rpm, the gearbox having A, B, C and D gears in total, the transmission ratio of the A gear being 1, the transmission ratio of the B gear being 1.2, the transmission ratio of the C gear being 1.5, and the transmission ratio of the D gear being 1.8 as an example, the ratio of the demand control rotating speed and the rotating speed threshold value can be obtained as 1.25, and the gears with a transmission ratio greater than 1.25 are the C gear and the D gear. Therefore, the C gear with the smallest transmission ratio in the C gear and the D gear can be taken as the target gear. Further, the ratio of the demand control rotating speed and the transmission ratio of the target gear can be obtained as 1500 rpm ÷ 1.5 = 1000 rpm, and therefore the target control rotating speed is 1000 rpm.

[0091] Figure 5 is a flow chart of another control method of the mixing truck according to an example embodiment, as shown in Figure 5 Step 103 can be implemented by the following steps:

[0092] Step 1031, controlling the gearbox to adjust one gear.

[0093] Step 1032, if the difference between the current rotating speed of the mixing drum and the rotating speed corresponding to the last gear adjustment is a preset step value, controlling the gearbox to adjust one gear.

[0094] Step 1033, repeatedly performing the step of controlling the gearbox to adjust one gear if the difference between the current rotating speed of the mixing drum and the rotating speed corresponding to the last gear adjustment is a preset step value, until the gear of the gearbox is the target gear.

[0095] For example, after the target control speed of the engine and the target gear of the gearbox are determined, if the target gear is higher than the current gear of the gearbox, the gearbox can be first controlled to increase by one gear, and then the speed of the mixing drum is continuously detected. When the difference between the speed of the mixing drum and the speed corresponding to the last time the gear is adjusted is a preset step value, the gearbox can be controlled to increase by one gear again. If the target gear is lower than the current gear of the gearbox, the gearbox can be first controlled to decrease by one gear, and then the speed of the mixing drum is continuously detected. When the difference between the speed of the mixing drum and the speed corresponding to the last time the gear is adjusted is a preset step value, the gearbox can be controlled to decrease by one gear again. Then step 1032 can be repeatedly executed until the gear of the gearbox is the target gear. In this way, by adjusting the gear of the gearbox step by step, the speed of the mixing drum can be smoothly adjusted, and the problem that the speed of the mixing drum suddenly changes to cause a jerk during rotation of the mixing drum can be avoided.

[0096] Specifically, taking the gears of the gearbox from low to high as A gear, B gear, C gear, the step value as 2 rpm, the current gear of the gearbox as A gear, the target gear as C gear, and the current speed of the mixing drum as 5 rpm as an example, the gear of the gearbox can be first controlled to increase from A gear to B gear, and when it is detected that the speed of the mixing drum changes to 7 rpm, the gear of the gearbox can be controlled to increase from B gear to C gear.

[0097] Figure 6 is a flowchart of another control method of the mixer truck according to an example embodiment, as shown in Figure 6 As shown in FIG. 10, step 103 can also be implemented by the following steps:

[0098] In step 1034, if the target speed is greater than the current speed of the mixing drum, the gear of the gearbox is controlled to increase, and the engine is controlled to decrease from the current control speed to a first specified speed.

[0099] In step 1035, the engine is controlled to increase from the first specified speed to the target control speed.

[0100] In step 1036, if the target speed is less than the current speed of the mixing drum, the gear of the gearbox is controlled to decrease, and the engine is controlled to increase from the current control speed to a second specified speed.

[0101] In step 1037, the engine is controlled to decrease from the second specified speed to the target control speed.

[0102] In the example, when the transmission is performing upshift or downshift control, the rotational speed of the transmission output shaft will change suddenly, causing the stirring drum to rotate jerkily. However, the rotational speed of the engine can continuously change, so the engine rotational speed can be adjusted in the opposite direction when the gear position of the transmission is adjusted, and then the engine rotational speed is adjusted to the target control rotational speed, so that the rotational speed of the stirring drum can be kept stable, and the rotational speed of the transmission output shaft can not cause the stirring drum to rotate jerkily.

[0103] Specifically, after the target control rotational speed of the engine and the target gear position of the transmission are determined, if the target rotational speed is greater than the current rotational speed of the stirring drum, the transmission needs to be controlled to increase from the current gear position to the target gear position, so the gear position of the transmission is controlled to increase, and the engine is controlled to decrease from the current control rotational speed to a first specified rotational speed. Then the engine rotational speed is controlled to increase from the first specified rotational speed to the target control rotational speed. If the target rotational speed is less than the current rotational speed of the stirring drum, the transmission needs to be controlled to decrease from the current gear position to the target gear position, so the gear position of the transmission is controlled to decrease, and the engine is controlled to increase from the current control rotational speed to a second specified rotational speed. It should be noted that the engine rotational speed can be decreased before the gear position is increased, or the engine rotational speed can be decreased while the gear position is increased, which is not limited in the present disclosure. Similarly, the engine rotational speed can be increased before the gear position is decreased, or the engine rotational speed can be increased while the gear position is decreased, which is not limited in the present disclosure.

[0104] In summary, the present disclosure first receives a rotational speed adjustment instruction, and determines the target control rotational speed of the engine of the mixer truck and the target gear position of the transmission of the mixer truck according to the target rotational speed indicated by the rotational speed adjustment instruction. Then the engine is controlled to operate at the target control rotational speed, and the transmission is adjusted to the target gear position. The engine is used to transmit torque to the transmission, and the transmission is used to transmit torque to the stirring drum through the transmission device, so that the stirring drum rotates at the target rotational speed. According to the target rotational speed of the stirring drum, the engine is controlled to operate at the target control rotational speed to transmit torque to the transmission, and the transmission is controlled to transmit torque to the stirring drum at the target gear position, so that the stirring drum rotates at the target rotational speed. The engine rotational speed can be controlled to be in the economic rotational speed range, and the stirring drum can be controlled to rotate at a high speed, which reduces the fuel consumption of the engine and improves the energy utilization rate.

[0105] Figure 7 is a block diagram of a control device of a mixer truck according to an example embodiment, as shown in Figure 7 The device 200 includes:

[0106] The receiving module 201 is configured to receive a rotational speed adjustment instruction, and the rotational speed adjustment instruction is used to indicate a target rotational speed of a stirring drum of a mixer truck.

[0107] The determining module 202 is configured to determine a target control rotating speed of an engine of the mixer truck and a target gear of a gearbox of the mixer truck according to the target rotating speed.

[0108] The control module 203 is configured to control the engine to operate at the target control rotating speed and adjust the gearbox to the target gear, the engine is configured to transmit torque to the gearbox, and the gearbox is configured to transmit the torque to the mixing drum through a transmission device to drive the mixing drum to rotate at the target rotating speed.

[0109] In one application scenario, the determining module 202 is configured to:

[0110] determine the demand control rotating speed according to the target rotating speed and a transmission ratio of the transmission device.

[0111] determine the target control rotating speed and the target gear according to the demand control rotating speed.

[0112] In another application scenario, the determining module 202 is configured to:

[0113] if the demand control rotating speed is less than or equal to a preset rotating speed threshold, determine the target control rotating speed as the demand control rotating speed and determine the target gear as an initial gear of the gearbox.

[0114] if the demand control rotating speed is greater than the rotating speed threshold, determine the target control rotating speed and the target gear according to the demand control rotating speed and the rotating speed threshold.

[0115] In another application scenario, the determining module 202 is configured to:

[0116] determine a ratio of the demand control rotating speed and the rotating speed threshold.

[0117] determine a gear with a smallest transmission ratio among gears with transmission ratios greater than the ratio in the gearbox as the target gear.

[0118] determine a ratio of the demand control rotating speed and the transmission ratio of the target gear as the target control rotating speed.

[0119] In another application scenario, the control module 203 is configured to:

[0120] control the gearbox to adjust one gear.

[0121] if a difference between the current rotating speed of the mixing drum and a rotating speed corresponding to a last time when the gear is adjusted is a preset step value, control the gearbox to adjust one gear.

[0122] repeat the step of controlling the gearbox to adjust one gear if the difference between the current rotating speed of the mixing drum and the rotating speed corresponding to the last time when the gear is adjusted is the preset step value until the gear of the gearbox is the target gear.

[0123] In another application scenario, the control module 203 is configured to:

[0124] If the target rotating speed is greater than the current rotating speed of the mixing drum, the gear of the gearbox is controlled to be raised, and the engine is controlled to be reduced from the current control rotating speed to the first specified rotating speed.

[0125] The engine is controlled to be raised from the first specified rotating speed to the target control rotating speed.

[0126] If the target rotating speed is less than the current rotating speed of the mixing drum, the gear of the gearbox is controlled to be lowered, and the engine is controlled to be raised from the current control rotating speed to the second specified rotating speed.

[0127] The engine is controlled to be reduced from the second specified rotating speed to the target control rotating speed.

[0128] As to the device in the above-mentioned embodiments, the specific manner in which each module performs the operation has been described in detail in the embodiments related to the method, and will not be described in detail here.

[0129] In summary, the present disclosure first receives a rotating speed adjustment instruction, and determines a target control rotating speed of an engine of the mixer truck and a target gear of a gearbox of the mixer truck according to a target rotating speed indicated by the rotating speed adjustment instruction. Then the engine is controlled to operate at the target control rotating speed, and the gearbox is adjusted to the target gear. The engine is used to transmit torque to the gearbox, and the gearbox is used to transmit the torque to the mixing drum through a transmission device, so that the mixing drum rotates at the target rotating speed. According to the target rotating speed of the mixing drum, the engine is controlled to operate at the target control rotating speed to transmit torque to the gearbox, and the gearbox is controlled to transmit torque to the mixing drum at the target gear, so that the mixing drum is controlled to rotate at the target rotating speed. On the premise that the rotating speed of the engine is in the economic rotating speed interval, the mixing drum is controlled to rotate at high speed, the fuel consumption of the engine is reduced, and the energy utilization rate is improved.

[0130] The present disclosure also relates to a mixer truck used to perform any one of the control methods of the mixer truck shown in the above-mentioned embodiments.

[0131] The preferred embodiments of the present disclosure are described in detail above with reference to the drawings, but the present disclosure is not limited to the specific details in the above-mentioned embodiments. Within the technical concept range of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all belong to the protection range of the present disclosure.

[0132] In addition, it should be noted that each specific technical feature described in the above-mentioned specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combination manners.

[0133] Furthermore, the various embodiments of the present disclosure can be arbitrarily combined with each other unless they contradict each other, and it should be understood that the same should be construed as being included in the disclosure of the present disclosure.

Claims

1. A control method of a mixer truck, characterized by, The method comprises: receiving a rotating speed adjustment instruction, the rotating speed adjustment instruction being used to indicate a target rotating speed of a mixing drum of a mixer truck; determining a target control rotating speed of an engine of the mixer truck and a target gear of a gearbox of the mixer truck according to the target rotating speed; controlling the engine to operate at the target control rotating speed and adjusting the gearbox to the target gear, the engine being used to transmit torque to the gearbox, the gearbox being used to transmit torque to the mixing drum through a transmission device to make the mixing drum rotate at the target rotating speed; the determining of the target control rotating speed of the engine of the mixer truck and the target gear of the gearbox of the mixer truck according to the target rotating speed comprises: determining a required control rotating speed according to the target rotating speed and a transmission ratio of the transmission device; determining the target control rotating speed and the target gear according to the required control rotating speed; the determining of the target control rotating speed and the target gear according to the required control rotating speed comprises: if the required control rotating speed is less than or equal to a preset rotating speed threshold value, determining the target control rotating speed as the required control rotating speed and determining the target gear as an initial gear of the gearbox; if the required control rotating speed is greater than the rotating speed threshold value, determining the target control rotating speed and the target gear according to the required control rotating speed and the rotating speed threshold value; the determining of the target control rotating speed and the target gear according to the required control rotating speed and the rotating speed threshold value comprises: determining a ratio of the required control rotating speed and the rotating speed threshold value; taking a gear with a transmission ratio smaller than the ratio among gears with transmission ratios greater than the ratio in the gearbox as the target gear; taking a ratio of the required control rotating speed and the transmission ratio of the target gear as the target control rotating speed.

2. The method of claim 1, wherein, the adjusting of the gearbox to the target gear comprises: controlling the gearbox to adjust one gear; if a difference between a current rotating speed of the mixing drum and a rotating speed corresponding to a last gear adjustment is a preset step value, controlling the gearbox to adjust one gear; repeating the step of controlling the gearbox to adjust one gear if the difference between the current rotating speed of the mixing drum and the rotating speed corresponding to the last gear adjustment is the preset step value until the gear of the gearbox is the target gear.

3. The method of claim 1, wherein, the controlling of the engine to operate at the target control rotating speed and the adjusting of the gearbox to the target gear comprises: if the target rotating speed is greater than a current rotating speed of the mixing drum, controlling the gear of the gearbox to be raised and controlling the engine to be lowered from a current control rotating speed to a first specified rotating speed; controlling the engine to be raised from the first specified rotating speed to the target control rotating speed; if the target rotating speed is less than the current rotating speed of the mixing drum, controlling the gear of the gearbox to be lowered and controlling the engine to be raised from the current control rotating speed to a second specified rotating speed; controlling the engine to be lowered from the second specified rotating speed to the target control rotating speed.

4. A control device for a mixer truck, characterized in that The control method is used for realizing the mixer truck in any one of claims 1-3, and the device comprises: a receiving module configured to receive a speed adjustment instruction, the speed adjustment instruction being used to indicate a target speed of a mixing drum of the mixer truck; a determining module configured to determine a target control speed of an engine of the mixer truck and a target gear of a gearbox of the mixer truck according to the target speed; a control module configured to control the engine to operate at the target control speed and adjust the gearbox to the target gear, the engine being used to transmit torque to the gearbox, the gearbox being used to transmit torque to the mixing drum through a transmission device, so that the mixing drum rotates at the target speed; the determining module is configured to: determine a required control speed according to the target speed and a transmission ratio of the transmission device; determine the target control speed and the target gear according to the required control speed.

5. The apparatus of claim 4, wherein, the determining module is configured to: if the required control speed is less than or equal to a preset speed threshold, determine the target control speed as the required control speed and determine the target gear as an initial gear of the gearbox; if the required control speed is greater than the speed threshold, determine the target control speed and the target gear according to the required control speed and the speed threshold.

6. A mixer truck characterized by the mixer truck is used to execute the control method of the mixer truck in any one of claims 1-3.

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