A hybrid drive system and method for a mixer truck

Abstract

This invention provides a hybrid drive system and method for a concrete mixer truck. The hybrid drive system includes: an electric drive system comprising a first motor, a gearbox, and a drive axle for driving the vehicle; and a mixing tank auxiliary drive system comprising an engine, a second motor connected to both the engine and the first motor, and a hydraulic assembly connected to the first motor; wherein the hydraulic assembly rotates to drive the mixing tank to rotate; the engine is controlled to switch between a first operating mode, a second operating mode, and a shutdown mode; the first operating mode is in which the engine acts as the drive source for the mixing tank; the second operating mode is in which the engine, while acting as the drive source for the mixing tank, also functions as a range extender along with the second motor to supply power to the first motor. In this invention, the engine can continuously operate within its economic speed range.

Description

Technical Field

[0001] This invention relates to the field of mixer trucks, and in particular to a mixer truck mixing drive system and method. Background Technology

[0002] Currently, concrete mixer trucks are driven by either a single engine or an electric motor, which results in problems such as limited power supply and lack of backup power. This can lead to power failures and a high risk of the concrete mixer truck becoming stuck.

[0003] Existing publicly available technical documents disclose a hybrid power system for a concrete mixer truck. Its auxiliary drive adopts a drive motor drive mode, and the main drive adopts a hybrid drive mode composed of an engine and an integrated electric generator. The vehicle can be driven by the engine alone, the integrated electric generator alone, or both the engine and the integrated electric generator together. In addition, the integrated electric generator can also switch to power generation mode, driven by the engine to generate electricity and charge the power battery.

[0004] The inventors believe that, due to the large power demand of the vehicle, the engine cannot continuously operate in the economic speed range in the prior art, represented by the aforementioned published technical documents, when the power battery is insufficient. Summary of the Invention

[0005] One object of the present invention is to provide a mixer truck hybrid drive system and method in which the engine can continuously operate in the economic speed range.

[0006] A further objective of this invention is to reduce the power requirements of the engine in hybrid mixer trucks.

[0007] Specifically, the present invention provides a mixing drive system for a mixer truck, comprising:

[0008] An electric drive system, including a first motor, a gearbox, and a drive axle, is used to drive the vehicle.

[0009] A mixing tank auxiliary drive system includes an engine, a second motor connected to the engine and the first motor respectively, a hydraulic assembly connected to the first motor, and a mixing tank that rotates under the action of the hydraulic assembly.

[0010] The engine is controlled to switch between a first operating mode, a second operating mode, and a shutdown mode. The first operating mode is when the engine acts as the driving source for the mixing tank. The second operating mode is when the engine acts as the driving source for the mixing tank and, together with the second motor, acts as a range extender to power the first motor.

[0011] Furthermore, it also includes an energy storage device, which includes a power battery connected to the first motor and the second motor respectively;

[0012] The second motor is controlled to switch between a first charging mode, a range-extending mode, a first electric drive mode, and a first sleep mode. The first charging mode is a mode for charging the power battery. The range-extending mode is a mode in which the second motor, together with the engine, acts as a range extender to power the first motor. The first electric drive mode is a mode in which the second motor acts as the driving source for the mixing tank.

[0013] Furthermore, the first motor is controlled to switch between a second charging mode, a second electric drive mode, and a second sleep mode. The second charging mode is a mode for charging the power battery, and the second electric drive mode is a mode in which the first motor acts as the power source for the vehicle to drive the vehicle.

[0014] In particular, the present invention also discloses a driving method for a mixer truck mixing drive system, comprising the following steps:

[0015] Obtain the operating status parameters of the mixer truck;

[0016] The working modes of the mixer truck's engine, first motor, and second motor are determined based on the working status parameters. The engine's working modes include a first working mode, a second working mode, and a shutdown mode. The first working mode is when the engine acts as the drive source for the mixing tank. The second working mode is when the engine acts as the drive source for the mixing tank and, together with the second motor, acts as a range extender to supply power to the first motor.

[0017] Furthermore, in the step of determining the operating modes of the engine, first motor, and second motor of the mixer truck based on the operating state parameters, the operating modes of the first motor include a second charging mode, a second electric drive mode, and a second dormant mode switching. The second charging mode is a mode for charging the power battery, and the second electric drive mode is a mode in which the first motor acts as the power source for the vehicle to drive. The operating modes of the second motor include a first charging mode, a range-extending mode, a first electric drive mode, and a first dormant mode switching. The first charging mode is a mode for charging the power battery, the range-extending mode is a mode in which the second motor, together with the engine, acts as a range extender to supply power to the first motor, and the first electric drive mode is a mode in which the second motor acts as the drive source for the mixing tank.

[0018] Furthermore, when the first motor operates in the second electric drive mode, the second motor operates in the range extender mode, and the engine operates in the second mode, the mixer truck operates in the range extender mode.

[0019] When the first motor is in the second electric drive mode, the second motor is in the first electric drive mode, and the engine is in the second working mode, the mixer truck is in pure electric driving mode.

[0020] When the first motor operates in the second electric drive mode, the second motor operates in the first charging mode, and the engine is in the shutdown mode, the mixer truck operates in a hybrid drive mode.

[0021] Furthermore, when the first motor operates in the second charging mode, the second motor operates in the first charging mode, and the engine operates in the second mode, the mixer truck operates in the state of extended-range driving followed by brake energy recovery.

[0022] When the first motor operates in the second charging mode, the second motor operates in the first electric drive mode, and the engine is in the shutdown mode, the mixer truck operates in pure electric driving mode followed by energy recovery.

[0023] Furthermore, when the first motor is in the second sleep mode, the second motor is in the first sleep mode, and the engine is in the first working mode, the mixer truck is in the stationary parking state.

[0024] Furthermore, when the first motor operates in the second sleep mode, the second motor operates in the first electric drive mode, and the engine operates in the stop mode, the mixer truck operates at idle speed.

[0025] Furthermore, when the first motor operates in the second sleep mode, the second motor operates in the first charging mode, and the engine operates in the second working mode, the mixer truck is in the charging state.

[0026] The control system of the hybrid drive system of the mixer truck in this invention, the auxiliary drive system of the mixing tank, includes an engine, a second motor connected to the engine and a first motor respectively, a hydraulic component connected to the first motor, and a mixing tank that rotates under the action of the hydraulic component. The second working mode is that the engine acts as the driving source of the mixing tank and, together with the second motor, acts as a range extender to supply power to the first motor. Therefore, the engine and the second motor actually constitute a range extender that provides energy to the electric drive system. The engine is actually decoupled from the overall vehicle driving conditions, so the engine can continuously operate in the optimal economic speed range. At the same time, the engine can be matched with a relatively smaller displacement engine according to actual needs, thereby further reducing the fuel consumption and emissions of the entire vehicle.

[0027] Furthermore, in this invention, by connecting the second motor and the first motor in parallel, both the second motor and the first motor can operate in power generation mode to charge the energy storage device, thereby extending the service life of the energy storage device. By changing the connection state of the engine and the second motor, as well as changing the operating mode of the second motor, the mixing tank can be freely switched between motor-driven and engine-driven operating modes. At the same time, power backup for the mixing tank is also achieved, which not only reduces the risk of the mixing tank becoming stuck due to power failure, but also avoids energy waste during the long idling period of the mixer truck while waiting for unloading, thus reducing fuel consumption.

[0028] Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention. Attached Figure Description

[0029] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0030] Figure 1 This is a schematic system configuration diagram of a mixer truck mixing drive system according to one or more embodiments of the present invention;

[0031] Figure 2 This is a schematic diagram of a second motor structure according to one or more embodiments of the present invention.

[0032] In the picture:

[0033] 1- Engine;

[0034] 2-Clutch;

[0035] 3-Second motor controller;

[0036] 4-Second motor;

[0037] 5-Hydraulic pump;

[0038] 6-Hydraulic motor;

[0039] 7- Gearbox;

[0040] 8-Agitator;

[0041] 9-First motor controller;

[0042] 10-Drive axle;

[0043] 11- Gearbox;

[0044] 12-First motor;

[0045] 13-Power battery;

[0046] 14-Power Battery Management System.

[0047] 101-Inspirer motor;

[0048] 102-Flywheel;

[0049] 103 - Electronic clutch control pump;

[0050] 104 - First Motor;

[0051] 105 - Connecting bolts between the power take-off flange and the hydraulic pump;

[0052] 106 - Hydraulic pump;

[0053] 107 - Power Take-Off Flange;

[0054] 108-High voltage power battery;

[0055] 109 - Power Distribution Unit;

[0056] 1010 - Connecting bolts between the internal conveyor and the first motor;

[0057] 1011 - Clutch;

[0058] 1012 - Internal Combustion Engine;

[0059] 1013 - Low-voltage power battery. Detailed Implementation

[0060] Figure 1 This is a schematic perspective view of a mixer truck hybrid drive system according to an embodiment of the present invention. The mixer truck hybrid drive system generally includes an electric drive system, a mixing tank auxiliary drive system, and an engine. The electric drive system includes a first motor 12, a gearbox 11, and a drive axle 10 for driving the vehicle. The mixing tank auxiliary drive system includes an engine 1, a second motor 4 connected to both the engine 1 and the first motor 12, a hydraulic assembly connected to the first motor 12, and a mixing tank 8 rotating under the action of the hydraulic assembly. The engine 1 is controlled to switch between a first operating mode, a second operating mode, and a shutdown mode. The first operating mode is a mode where the engine acts as the drive source for the mixing tank 1. The second operating mode is a mode where the engine, while acting as the drive source for the mixing tank 1, also functions as a range extender along with the second motor 4 to supply power to the first motor.

[0061] In this embodiment, the mixing tank auxiliary drive system includes an engine 1, a second motor 4 connected to both the engine 1 and the first motor 12, a hydraulic assembly connected to the first motor 12, and a mixing tank 8 rotating under the action of the hydraulic assembly. The second operating mode of the engine 1 is that the engine acts as the drive source for the mixing tank 1 while simultaneously functioning as a range extender along with the second motor 4 to supply power to the first motor. Therefore, the engine 1 and the second motor 12 effectively constitute a range extender that provides energy to the electric drive system. The engine 1 is essentially decoupled from the vehicle's driving conditions, allowing it to continuously operate within its optimal economic speed range. Furthermore, the engine 1 can be matched with a smaller displacement engine as needed, further reducing the vehicle's fuel consumption and emissions.

[0062] According to one embodiment of the present invention, the first motor 12 is a motor on the body of the mixer truck, belonging to the power source for the mixer truck's movement. In this embodiment, it is also used to output electrical energy to an energy storage device. The power input end of the second motor 4 is connected to the engine 1 through a clutch 2, and the power output end of the second motor 4 is connected to the reducer 7 through a hydraulic assembly. The reducer 7 is connected to the mixing tank 8, so the second motor 4 can work together with the engine 1 to drive the mixing tank 8, and in some cases, it can drive the mixing tank 8 independently. The second motor 4 is also connected to an energy storage device, which is connected to both the second motor 4 and the first motor 12. In this embodiment, both the second motor 4 and the first motor 12 are integrated electric generators. Therefore, both the second motor 4 and the first motor 12 can output power to the energy storage device and store it in the energy storage device, and can also draw power from the energy storage device for driving. In order to control the second motor 4 and the first motor 12, this embodiment also includes a second motor controller 3 and a first motor controller 9, which are used to adjust the operating modes of the second motor 4 and the vehicle's first motor 12.

[0063] According to one embodiment of the present invention, the above-mentioned energy storage device includes a power battery 13 and a power battery management system 14 (BMS) connected to the power battery 13. The power battery 13 adopts plug-in technology and can obtain electrical energy from the external power grid through the plug-in system. Furthermore, by combining with fast charging function, it can be charged during fragmented time while waiting at the concrete mixing plant, thereby increasing the proportion of pure electric driving range of the vehicle. While reducing fuel consumption and emissions, it also reduces the power demand of the power battery 13, reduces vehicle purchase cost, and improves investment efficiency.

[0064] According to one embodiment of the present invention, the first motor 12 is controlled to switch between a second charging mode, a second electric drive mode, and a second dormant mode. The second charging mode is a mode for charging the power battery, and the second electric drive mode is a mode in which the first motor acts as the power source for the vehicle. The second motor 4 is switched between a first charging mode, a range-extending mode, a first electric drive mode, and a first dormant mode. The first charging mode is a mode for charging the power battery, the range-extending mode is a mode in which it acts as a range extender along with the engine to supply power to the first motor, and the first electric drive mode is a mode in which the second motor acts as the drive source for the mixing tank. Furthermore, due to the characteristics of the second motor 4, the engine 1 connected to the second motor 4 can also use the second motor 4 as a drive shaft, so that the engine 1 can output power to drive the mixing tank independently. The mixing tank 8 has two driving modes: a motor drive mode and an engine drive mode. By changing the connection state of the clutch 2 and the operating mode of the second motor 4, the mixing tank 8 can freely switch between the two driving modes: motor drive and engine drive. Specifically, when engine 1 is in operating mode, clutch 2 is engaged, and the mixing tank 8 is in engine 1 drive mode. Therefore, the engine is controlled to switch between the first operating mode, the second operating mode, and the shutdown mode. The first operating mode is when the engine acts as the drive source for the mixing tank. The second operating mode is when the engine acts as the drive source for the mixing tank while simultaneously acting as a range extender along with the second motor to power the first motor. It is understood that the first motor in this embodiment is a common DC motor or AC motor.

[0065] According to one embodiment of the present invention, the hydraulic assembly includes a hydraulic pump 5 and a hydraulic motor 6. The hydraulic pump 5 and the hydraulic motor 6 are connected by a hydraulic pipeline. The hydraulic pump 5 provides power to the hydraulic motor 6 by driving the hydraulic oil in the hydraulic pipeline. The hydraulic motor 6 is used for driving, taking advantage of its wide speed range and stable operation at low speeds, which helps maintain the stable operation of the mixer. It is understood that the specific selection of the hydraulic pump 5 and the hydraulic motor 6 in this embodiment can be made by those skilled in the art. The hydraulic assembly can also be replaced by a pneumatic system, which includes an air pump and a pneumatic motor; their connection relationship will not be described further here.

[0066] According to one embodiment of the present invention, the output shaft of engine 1 is connected to the input shaft of second motor 4 via clutch 2, and the output shaft at the other end of second motor 4 is connected to hydraulic pump 5. The output shaft of second motor 4 can be coaxial with or non-coaxial with the rotor shaft of second motor 4. When non-coaxial, second motor 4 and engine 1 are driven by a gear set, allowing the output shaft and rotor shaft to be arranged in parallel and the speed ratio to be changed as needed. Specifically, the output shaft of second motor 4 is connected to the drive shaft of hydraulic pump 5 via a spline, and drives mixing tank 8 through hydraulic pump 5, hydraulic motor 6, and reducer 7. Second motor 4 can convert the mechanical energy input from engine 1 into electrical energy in generator mode and output it to power battery 13 and first motor 12, or it can convert the electrical energy output from power battery 13 into mechanical energy in drive mode to drive hydraulic pump 5.

[0067] According to one embodiment of the present invention, the first motor 12 can be connected to the aforementioned power battery 13, and under the control of the controller, when the vehicle brakes, the first motor 12 can output electrical energy to the power battery 13 in the power generation mode, thereby forming a braking energy recovery mechanism. Combined with the frequent braking and starting working scenario of the mixer truck, the mechanical energy of the whole vehicle during braking can be converted into electrical energy, reducing the fuel consumption and emissions of the whole vehicle.

[0068] According to one embodiment of the present invention, the second motor 4 used in one or more of the above embodiments is a device that combines the functions of a power take-off and a range extender, such as... Figure 2 As shown, the second motor 4 is located at the rear of the engine and has starting and power generation functions; the electronic clutch control pump 103 is integrated into the housing of the first motor 104; the clutch 1011 is located between the engine 1012 and the first motor 104 and has torque limiting and vibration reduction functions; the power take-off 107 is simplified into a flange form, located at the rear of the first motor 104 of the range extender, coaxially connected to the rotor of the first motor 104, and fixedly connected to the flange face of the hydraulic pump 106 by connecting bolts 106, eliminating the clutch, housing, gears, controller and other structures of the traditional power take-off. The overall structure is more compact, weight and cost are reduced, and the platformization degree is higher. The second motor 4 can provide the following working modes:

[0069] 1) Pure electric drive mode: Powered by high-voltage power battery 108, the power is distributed to the first motor 104 via power distribution unit 109. The first motor 104 rotates, driving the power take-off flange 107 to work.

[0070] 2) Engine drive mode: Powered by the low-voltage power battery 1013, the starter motor 101 works to start the engine 1012 to rotate. At the same time, the electronic clutch control pump 103 controls the clutch 1011 to engage, transmitting the torque of the engine 1012 to drive the power take-off flange 107 to work. At this time, the starter motor 101 generates electricity and charges the low-voltage power battery 1013. The first motor 104 does not participate in driving and generating electricity and is in a follow-rotation state.

[0071] 3) Hybrid drive power generation mode: Powered by low-voltage power battery 1013; starter motor 101 starts engine 1012 to work, while electronic clutch control pump 103 controls clutch 101 to engage, transmitting torque of engine 1012 to drive first motor 104 to generate electricity to high-voltage power battery 108 and drive power take-off flange 7 to work.

[0072] As can be seen, in one or more embodiments of the present invention, the free switching of multiple driving modes of the mixing tank 8 is realized, and the charging function of the vehicle's power battery 13 is also realized, solving the problems of range and cost of the vehicle's electric drive system; the hybrid drive strategy of engine 1 and second motor 4 solves the problems of auxiliary drive power backup and idling fuel consumption of the mixing tank 8, while the whole system provides electrical energy to the energy storage device for storage through the second motor 4 and the first motor 12 in power generation mode, alleviating the range problem of the whole vehicle. Furthermore, because the engine 1 and the vehicle's driving conditions are decoupled, the engine 1 can continuously operate in the optimal economic speed range, and the engine 1 can be selected to use a relatively smaller displacement model according to actual needs, thereby further reducing the fuel consumption and emissions of the whole vehicle.

[0073] Specifically, the invention also discloses a mixer truck, including the aforementioned mixer truck hybrid drive system. During vehicle operation, the first motor 12, under the control of a motor controller, converts electrical energy into mechanical energy and drives the vehicle through the gearbox 11 and drive axle 10. During vehicle braking, the first motor 12, under the control of the motor controller, converts the vehicle's mechanical energy into electrical energy and outputs it to the power battery 13 for storage, achieving regenerative braking. In this mixer truck, the power source for the mixing tank is actually a range extender. This range extender not only solves the power demand of the mixing tank but also considers the power demand of the entire vehicle. Traditional hybrid systems can only optimize for one power demand and cannot simultaneously meet two or more power demands, still placing a large demand on engine displacement and power. The mixer truck hybrid drive system used in this embodiment simultaneously considers the power output to the mixing tank and the power output during the mixer truck's movement, allowing the engine displacement to be controlled as a single variable, thus keeping the engine displacement within an economical fuel consumption range.

[0074] Specifically, the invention also discloses a control method for a mixer truck's mixing drive system, used to control the mixer truck's mixing drive system, comprising the following steps:

[0075] S1. Obtain the working status parameters of the mixer truck.

[0076] S2. Determine the working modes of the mixer truck's engine 1, first motor 12, and second motor 4 based on the working status parameters. The working modes of engine 1 include a first working mode, a second working mode, and a shutdown mode. The first working mode is when engine 1 acts as the driving source for the mixing tank. The second working mode is when engine 1 acts as the driving source for the mixing tank and, together with the second motor 4, acts as a range extender to supply power to the first motor 12.

[0077] According to one embodiment of the present invention, for ease of describing the control flow, the second motor 4 controller 3, the first motor 12 controller 9, and other controllers on the mixer truck are collectively referred to as controllers in this embodiment. In step S1, the controller acquires the working status parameters of the mixer truck. These working status parameters are issued by the driver, i.e., the driver issues a work command, the controller parses the work command, and then the entire vehicle acquires the working status parameters. After the entire vehicle acquires the working status parameters, it then determines which working mode the engine 1, the first motor 12, and the second motor 4 should adopt. Simultaneously, this step can also be considered as a control system with feedback, where the working modes of the engine 1, the first motor 12, and the second motor 4 indirectly determine the working status parameters of the mixer truck through feedback.

[0078] According to one embodiment of the present invention, in step S2, which determines the operating modes of the engine 1, the first motor 12, and the second motor 4 of the mixer truck based on the operating state parameters, the operating modes of the first motor 12 include a second charging mode, a second electric drive mode, and a second dormant mode switching. The second charging mode is a mode for charging the power battery, and the second electric drive mode is a mode in which the first motor 12 acts as the power source for driving the vehicle. The operating modes of the second motor 4 include a first charging mode, a range-extending mode, a first electric drive mode, and a first dormant mode switching. The first charging mode is a mode for charging the power battery, the range-extending mode is a mode in which the second motor 4, together with the engine 1, acts as a range extender to supply power to the first motor 12, and the first electric drive mode is a mode in which the second motor 4 acts as the driving source for the mixing tank.

[0079] According to one embodiment of the present invention, when the first motor 12 operates in the second electric drive mode, the second motor 4 operates in the range-extending mode, and the engine 1 operates in the second mode, the mixer truck operates in range-extending driving mode. At this time, the controller issues a working command to the engine 1, a power generation mode command to the second motor 4, and a power storage command to the energy storage device. Upon receiving the working command, the engine 1 outputs power, the second motor 4 generates electricity under the drive of the engine 1 and supplies power to the energy storage device, and the hydraulic components drive the mixing tank 8 to rotate under the drive of the engine 1. It is understood that the clutch 2 between the engine 1 and the second motor 4 is in a linked state at this time. This operating state allows the mixing tank 8 to be directly driven by the engine 1, reducing energy loss. The electricity generated by the second motor 4 can be partially directly output to the first motor 12 and partially output to the energy storage device for storage. This range-extending driving state is often used in scenarios where the vehicle's driving force demand is low and the power battery 13 is insufficient, such as when the mixer truck is returning. This operating state and the pure electric driving state can be switched as needed, realizing power backup for the mixing tank 8 during driving conditions and effectively reducing the risk of the tank becoming stuck.

[0080] According to one embodiment of the present invention, when the first motor 12 operates in the second electric drive mode, the second motor 4 operates in the first electric drive mode, and the engine 1 operates in the second mode, the mixer truck operates in pure electric mode. At this time, the controller issues a stop command to the engine 1 and a power output command to the second motor 4. Upon receiving the stop command, the engine 1 stops, and the second motor 4 outputs power independently to the hydraulic components, which then drive the mixing tank 8 to rotate. It is understood that the clutch 2 between the engine 1 and the second motor 4 is disengaged at this time. This operating state enables the entire vehicle to be electrically driven, and when the power battery 13 has sufficient charge, it can effectively reduce energy consumption and emissions.

[0081] According to one embodiment of the present invention, when the first motor 12 operates in the second electric drive mode, the second motor 4 operates in the first charging mode, and the engine 1 is in the shutdown mode, the mixer truck operates in a hybrid drive mode. At this time, the controller issues a working command to the engine 1, a power generation command to the second motor 4, and a discharge command to the energy storage device. Upon receiving the working command, the engine 1 outputs power to the hydraulic components, the second motor 4 generates electricity and outputs electrical energy to the first motor 12, and the energy storage device outputs electrical energy to the first motor 12. This operating state is commonly used in scenarios requiring significant vehicle driving force, such as starting or overtaking.

[0082] According to one embodiment of the present invention, when the first motor 12 operates in the second charging mode, the second motor 4 operates in the first charging mode, and the engine 1 operates in the second mode, the mixer truck operates in a range-extended driving mode with regenerative braking. At this time, the controller issues a working command to the engine 1, a power generation command to the second motor 4, a power storage command to the energy storage device, and a power generation command to the first motor 12. Upon receiving the working command, the engine 1 starts and outputs power to the second motor 4. The second motor 4 generates electricity and outputs electrical energy to the energy storage device, and the first motor 12 generates electricity and outputs electrical energy to the energy storage device. This operating state allows the mixing tank 8 to be directly driven by the engine 1, reducing energy loss. The second motor 4 generates electricity and outputs it to the power battery 13, and the electrical energy generated by the regenerative braking of the first motor 12 is also output to the power battery 13.

[0083] According to one embodiment of the present invention, when the first motor 12 operates in the second charging mode, the second motor 4 operates in the first electric drive mode, and the engine 1 is in the shutdown mode, the mixer truck operates in a pure electric driving state followed by energy recovery. At this time, the controller issues a stop command to the engine 1, a power output command to the second motor 4, a discharge command to the energy storage device, and a power generation command to the first motor 12. The second motor 4 also outputs power, the first motor 12 generates electricity and outputs electrical energy to the second motor 4, and the energy storage device outputs electrical energy to the second motor 4. This operating state enables the electric drive of the mixing tank 8 and the recovery of braking energy for the entire vehicle.

[0084] According to one embodiment of the present invention, when the first motor 12 is in the second sleep mode, the second motor 4 is in the first sleep mode, and the engine 1 is in the first working mode, the mixer truck is in a stationary parking state. At this time, the controller sends a power output command to the second motor 4, a discharge command to the energy storage device, and a sleep maintenance command to the first motor 12. Upon receiving the working command, the engine 1 stops working; the second motor 4 receives the power output command and outputs power to the hydraulic components; and the first motor 12 receives the sleep command and enters sleep mode. This working state avoids prolonged idling of the mixer truck while waiting to unload, reducing fuel consumption and emissions, and protecting the engine 1. This working state and the working state when the mixer truck is idling can be switched as needed, enabling power backup for the mixing tank 8 during parking conditions and effectively reducing the risk of tank malfunction.

[0085] According to one embodiment of the present invention, when the first motor 12 operates in the second sleep mode, the second motor 4 operates in the first electric drive mode, and the engine 1 operates in the shutdown mode, the mixer truck operates at idle speed. This condition is commonly used when the high-pressure system of the mixer truck malfunctions. In this case, the controller issues a working command to the engine 1, a sleep command to the second motor 4, a sleep command to the energy storage device, and a sleep command to the first motor 12. After receiving the working command, the engine 1 starts and outputs power to the hydraulic pump 5, the second motor 4 enters sleep mode, and the first motor 12 enters sleep mode. In this working state, the mixing tank 8 can be directly driven by the engine 1. This working state is commonly used when the high-pressure system of the mixer truck malfunctions, and to ensure that the mixing tank 8 is not blocked, the engine 1 drives the mixing tank 8.

[0086] According to one embodiment of the present invention, when the first motor 12 operates in the second sleep mode, the second motor 4 operates in the first charging mode, and the engine 1 operates in the second working mode, the mixer truck is in a charging state. At this time, the controller issues a working command to the engine 1, a power generation command to the second motor 4, and a sleep command to the first motor 12. Upon receiving the working command, the engine 1 enters or maintains a power output state. This working state allows the mixing tank 8 to be directly driven by the engine 1, reducing energy loss. The second motor 4 generates electricity to charge the power battery 13. This working state is used when the mixer truck is waiting to unload, and when the power battery 13 has a low charge due to a long transportation distance or long waiting time.

[0087] As can be seen, in this embodiment, while maintaining a constant engine speed, the energy storage device executes an energy harvesting strategy, a hibernation strategy, or a discharge strategy based on the driving and braking conditions of the mixer truck.

[0088] Therefore, those skilled in the art should recognize that although numerous exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications conforming to the principles of the present invention can be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Thus, the scope of the present invention should be understood and construed as covering all such other variations or modifications.

Claims

1. A mixing drive system for a concrete mixer truck, characterized in that, include: An electric drive system, including a first motor, a gearbox, and a drive axle, is used to drive the vehicle. An auxiliary drive system for a mixing tank includes an engine, a second motor connected to both the engine and the first motor, and a hydraulic assembly connected to the second motor; wherein the hydraulic assembly is used to drive the mixing tank to rotate. The engine is controlled to switch between a first operating mode, a second operating mode, and a shutdown mode. The first operating mode is when the engine acts as the driving source for the mixing tank. The second operating mode is when the engine acts as the driving source for the mixing tank and, together with the second motor, acts as a range extender to power the first motor. The mixer truck's hybrid drive system also includes an energy storage device, which includes a power battery. The power battery is connected to the first motor and the second motor respectively. The second motor is controlled to switch between a first charging mode, a range-extending mode, a first electric drive mode, and a first sleep mode. The first charging mode is a mode that charges the power battery. The range-extending mode is a mode in which the second motor, together with the engine, acts as a range extender to power the first motor. The first electric drive mode is a mode in which the second motor acts as the driving source for the mixing tank. The first motor is controlled to switch between a second charging mode, a second electric drive mode, and a second sleep mode. The second charging mode is the mode of charging the power battery, and the second electric drive mode is the mode in which the first motor acts as the power source of the vehicle to drive the vehicle.

2. A driving method for the mixing drive system of a mixer truck as described in claim 1, characterized in that, Includes the following steps: Obtain the operating status parameters of the mixer truck; The working modes of the mixer truck's engine, first motor, and second motor are determined based on the working status parameters. The engine's working modes include a first working mode, a second working mode, and a shutdown mode. The first working mode is when the engine acts as the drive source for the mixing tank. The second working mode is when the engine acts as the drive source for the mixing tank and, together with the second motor, acts as a range extender to supply power to the first motor.

3. The driving method according to claim 2, characterized in that, In the step of determining the working modes of the mixer truck's engine, first motor, and second motor based on the working state parameters, the working modes of the first motor include a second charging mode, a second electric drive mode, and a second dormant mode switching. The second charging mode is a mode for charging the power battery, and the second electric drive mode is a mode where the first motor acts as the power source to drive the vehicle. The working modes of the second motor include a first charging mode, a range-extending mode, a first electric drive mode, and a first dormant mode switching. The first charging mode is a mode for charging the power battery, the range-extending mode is a mode where the second motor, together with the engine, acts as a range extender to power the first motor, and the first electric drive mode is a mode where the second motor acts as the drive source for the mixing tank.

4. The driving method according to claim 3, characterized in that, When the first motor is in the second electric drive mode, the second motor is in the range extender mode, and the engine is in the second working mode, the mixer truck is in the range extender driving state. When the first motor is in the second electric drive mode, the second motor is in the first electric drive mode, and the engine is in the second working mode, the mixer truck is in pure electric driving mode. When the first motor operates in the second electric drive mode, the second motor operates in the first charging mode, and the engine is in the shutdown mode, the mixer truck operates in a hybrid drive mode.

5. The driving method according to claim 3, characterized in that, When the first motor is in the second charging mode, the second motor is in the first charging mode, and the engine is in the second operating mode, the mixer truck is in the operating state of extended-range driving followed by brake energy recovery. When the first motor operates in the second charging mode, the second motor operates in the first electric drive mode, and the engine is in the shutdown mode, the mixer truck operates in pure electric driving mode followed by energy recovery.

6. The driving method according to claim 3, characterized in that, When the first motor is in the second sleep mode, the second motor is in the first sleep mode, and the engine is in the first working mode, the mixer truck is in the stationary parking state.

7. The driving method according to claim 3, characterized in that, When the first motor is in the second sleep mode, the second motor is in the first electric drive mode, and the engine is in the stop mode, the mixer truck is in the idling state.

8. The driving method according to claim 3, characterized in that, When the first motor is in the second sleep mode, the second motor is in the first charging mode, and the engine is in the second working mode, the mixer truck is in the charging state.

Images