Complete engineering machine and control method

Abstract

The invention discloses an engineering machinery complete machine and a control method. The engineering machinery complete machine comprises a power battery system, a power distribution component, a range extender, a heat dissipation system of the range extender, a walking system, an operation device driving system, a rectification and inversion system and a low-voltage power supply system. The power distribution component comprises pre-charging circuits and relays, is used for distributing a high-voltage power source to each electrical system, and comprises a range extender, a heat dissipation system pre-charging circuit of the range extender, a walking system relay, an operation driving system pre-charging circuit and a rectification and inversion system pre-charging circuit, and each pre-charging circuit and the relay are connected in parallel. According to the invention, through the combination of software and hardware, the high-voltage systems are decoupled, a certain function is enabled, and the high-voltage system responsible for the function is conducted, so that the safety of the whole machine is improved; and meanwhile, when the high-voltage system has an insulation fault, a faulted loop is cut off, and the whole machine can still use other functions, so that the use reliability of the whole machine is improved.

Description

Technical Field

[0001] The present invention relates to an engineering machinery complete machine, and in particular to an engineering machinery complete machine and a control method thereof. Background Art

[0002] With the acceleration of the electrification of construction machinery, traditional fuel-powered systems are gradually transitioning to electric drive systems. Construction vehicles have numerous operating devices, and electrification introduces a large number of dispersed electrical components. This not only adds a large number of new pipelines to the system, but also creates coupling between high-voltage circuits due to circuit connections. A circuit failure in one component can affect the entire system, rendering the entire machine inoperable and sometimes even unable to move to another site, causing significant inconvenience in actual operations. Summary of the Invention

[0003] Purpose of the invention: The purpose of the present invention is to provide an engineering machinery complete machine and a control method, which can reasonably distribute the power source when there are many actuators.

[0004] Technical solution: The present invention includes a power battery system, a power distribution component, a range extender and its heat dissipation system, a travel system, an operating device drive system, a rectifier and inverter system, and a low-voltage power supply system; the power distribution component includes a pre-charging circuit and a relay, which is used to distribute the high-voltage power source to each electrical system, including the range extender and its heat dissipation system pre-charging circuit, the travel system relay, the operating drive system pre-charging circuit, and the rectifier and inverter system pre-charging circuit. The pre-charging circuits and relays are connected in parallel.

[0005] The power battery system includes power batteries, battery thermal management, and pre-charging circuits. The power battery system can independently provide a high-voltage power source for the entire machine.

[0006] The range extender and its cooling system include an engine, a generator, a generator controller, a fan drive motor, and a fan drive motor controller.

[0007] The pre-charging circuit of the range extender and its cooling system is divided into two branches at the rear end of the pre-charging circuit, providing a high-voltage power source for the generator controller and the fan drive motor controller at the same time.

[0008] The walking system is used to move the entire machine, including a drive motor power module, a drive motor power module, a first walking motor, a second walking motor, mechanical transmission components and a walking domain controller; the first walking motor and the second walking motor are left and right drive motors or front and rear drive motors.

[0009] The operating device drive system is used to meet the different operating drive requirements of the entire construction machinery, including an all-in-one drive system, a first operating drive motor, a second operating drive motor and mechanical transmission components.

[0010] The rectifier and inverter system is used to realize the interactive use of the whole machine and external AC power, including ACDC+DCAC module, AC charging interface, other AC power systems and system controller.

[0011] The low-voltage power supply system is used to provide low-voltage power for the entire machine, including a low-voltage DCDC, a lead-acid battery, and a low-voltage load. The low-voltage DCDC and the lead-acid battery are connected in parallel to provide low-voltage power for the low-voltage load.

[0012] The entire construction machinery includes four modes: walking working mode, operating working mode, AC charging mode and vehicle power supply function; among them, the walking working mode, operating working mode and vehicle power supply function can be in pure electric state or range extender state; the AC charging mode can only work in pure electric state.

[0013] The control method for the complete engineering machinery comprises:

[0014] 1) The whole machine issues a low-voltage power-on command, and the lead-acid battery in the low-voltage power supply system provides low-voltage power to the whole machine, then closes the relay and wakes up the power battery system at the same time;

[0015] 2) The low-voltage DC / DC converter in the low-voltage power supply system starts to work and is used to charge the low-voltage load of the entire machine or the lead-acid battery;

[0016] 3) After the power battery system detects and determines that the circuit is normal, the pre-charging process of the power battery is started and high voltage is applied;

[0017] If the whole machine is in walking working mode + pure electric state, the whole machine can start walking after completing the above process;

[0018] If the machine is in walking working mode + range extender status, continue with the following process:

[0019] 4) After the power battery is charged to high voltage, start the pre-charging process of the range extender and its cooling system branch until the pre-charging is completed;

[0020] 5) Control the generator and the range extender starts working;

[0021] 6) Control the working state of the fan drive motor controller according to the engine water temperature;

[0022] If the machine is in operating mode + range extender status, the following process is executed:

[0023] 7) The pre-charging circuit of the operation drive system starts working;

[0024] If the whole machine is in the working mode + pure electric state, then directly execute process 7) after completing process 3);

[0025] If the vehicle power supply function is enabled on the whole machine, the following process needs to be executed:

[0026] 8) Start the pre-charging process of the rectifier and inverter branches;

[0027] If the device is in AC charging mode, the following process is executed:

[0028] 1) If the power battery is charged with AC power without being powered off, the pre-charging process of the rectifier and inverter system is executed;

[0029] 2) If the whole machine is in sleep mode, wake it up and start the low-voltage power supply system;

[0030] 3) The power battery system is awakened, K40 is directly closed, and the power battery high-voltage process is executed;

[0031] 4) After the power battery is charged with high voltage, it can interact with external AC charging equipment.

[0032] Beneficial effects: The present invention has the following advantages:

[0033] 1) Through the combination of software and hardware, the various high-voltage systems are decoupled. When a certain function is enabled, the high-voltage system responsible for that function is turned on, which improves the safety of the entire machine. At the same time, when an insulation fault occurs in the high-voltage system, the faulty circuit is disconnected, and the entire machine can still use other functions, which improves the reliability of the entire machine.

[0034] 2) The walking system branch of the present invention directly utilizes the pre-charging circuit inside the power battery system and can be isolated from other branches. When there are problems with other components of the system, the walking function of the entire machine is still effective, which is conducive to the transfer of the entire machine and improves the reliability of the entire machine. This structure can not only improve the economy of the entire machine operation, but also improve the reliability of the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a system block diagram of the present invention;

[0036] Figure 2 It is a detailed diagram of the whole structure of the present invention;

[0037] Figure 3 It is a schematic diagram of the whole machine status mode of the present invention. DETAILED DESCRIPTION

[0038] The present invention will be further described below with reference to the accompanying drawings.

[0039] like Figure 1As shown, the complete construction machinery of this embodiment includes a power battery system, power distribution components, a range extender and its cooling system, a travel system, a working device drive system, a rectifier and inverter system, and a low-voltage power supply system. The power battery system, the range extender, and its cooling system are the power sources of the complete construction machinery. The power distribution components control and distribute the high-voltage power source. The travel system enables movement of the complete machinery. The working device drive system meets the various operational drive requirements of the complete construction machinery. The rectifier and inverter system enables the complete machinery to interact with external AC power. The low-voltage power supply system provides low-voltage power to the complete machinery.

[0040] like Figure 2 As shown, the power battery system includes power batteries, battery thermal management, pre-charging circuits, and a battery management system not shown in the schematic diagram, a negative electrode relay, etc., which are used to provide a high-voltage power source for the entire vehicle; the power battery system can independently provide a high-voltage power source for the entire machine, but the range extender and its cooling system cannot independently provide a high-voltage power source for the entire machine. The working premise is that the power battery system is in a standby state.

[0041] The power distribution unit includes pre-charging circuits and relays, which distribute high-voltage power to various electrical systems. These include the range extender and its cooling system pre-charging circuit, the travel system relays K10 and K11, the work drive system pre-charging circuit, and the rectifier and inverter system pre-charging circuits. Each pre-charging circuit and relays K10 and K11 are connected in parallel. The range extender and its cooling system pre-charging circuit splits into two branches at the rear end of the pre-charging circuit, providing high-voltage power to both the generator controller and the fan drive motor controller. The travel system has two relays, one for each input of the travel system. These two relays control the high-voltage power supply to each motor, enabling both motors to operate simultaneously. Furthermore, if a single motor fails, the relay can shut it off without affecting the other motor.

[0042] The range extender and its cooling system include the engine, generator, generator controller, fan drive motor, fan drive motor controller, and other components not shown in the schematic, such as the engine controller, range extender controller, fan, and radiator. These components also provide a high-voltage power source for the vehicle. The fan drive motor controller and generator controller share a pre-charge circuit. The fan drive motor is a high-voltage drive, and the radiator can include engine water cooling, engine intercooling, hydraulic cooling, and a motor cooling core. The fan drive motor's startup and operating status are controlled based on the system's cooling requirements.

[0043] In a hybrid system, the range extender is started by the reverse rotation of the range extender's generator. Therefore, before the range extender is started, the power battery must be at high voltage. At the same time, when the range extender is the primary power source, the power battery must still be at high voltage to provide supplementary power and load for the range extender.

[0044] The travel system, which drives the entire vehicle, includes a drive motor power module, a first travel motor, a second travel motor, mechanical transmission components, and a travel domain controller. The first and second travel motors can be left and right drive motors, or front and rear drive motors, respectively. The travel domain controller coordinates and controls the speed and torque of the first and second travel motors. Depending on the vehicle's powertrain architecture, the travel system can also consist of a single drive motor.

[0045] The travel system branch directly utilizes the pre-charge circuit inside the power battery system and can be isolated from other branches. When there are problems with other components of the system, the travel function of the entire machine is still valid, which is conducive to the transfer of the entire machine and improves the reliability of the entire machine. This structure can not only improve the economy of the entire machine operation, but also improve the reliability of the operation.

[0046] The working device drive system, designed to meet the operational requirements of construction machinery, includes an all-in-one drive system, a first working drive motor, a second working drive motor, and mechanical transmission components. The number of drive motors varies depending on the specific construction machinery, and the all-in-one drive system is an integrated motor drive controller. Because construction machinery may have multiple working devices, the working device drive system may have more than one circuit.

[0047] The rectifier and inverter system is used to convert the external AC source into DC power for AC charging of the power battery, or to convert the DC source of the power battery into AC source output for other power needs of the vehicle, including the ACDC+DCAC module, AC charging interface, other AC power systems and system controller; among them, the ACDC module in the ACDC+DCAC module can be used for AC charging of the power battery system, and the DCAC module in the ACDC+DCAC module can be used to convert the DC power of the power battery into AC power for use in the vehicle or other AC needs, such as the electric heating function of the ironing board in paving machinery. The system controller is used to control the working mode of the ACDC+DCAC module, including whether it is ACDC mode or DCAC mode.

[0048] The low-voltage power supply system is used to provide low-voltage power to the entire machine, including a low-voltage DCDC, a lead-acid battery, and a low-voltage load. The low-voltage DCDC and the lead-acid battery are connected in parallel to provide low-voltage power to the low-voltage load.

[0049] like Figure 3 As shown, the engineering machinery of this embodiment includes four modes: walking working mode, operating working mode, AC charging mode and vehicle power supply function; among them, the walking working mode, operating working mode and vehicle power supply function can be in pure electric state or range extender state; the AC charging mode can only work in pure electric state.

[0050] The control method of the complete construction machinery is as follows:

[0051] 1) The whole machine issues a low-voltage power-on command, and the lead-acid battery in the low-voltage power supply system provides low-voltage power to the whole machine. Then, relays K10 and K11 are closed, waking up the power battery system at the same time.

[0052] 2) The low-voltage DC / DC converter in the low-voltage power supply system starts to work and is used to charge the low-voltage load of the entire machine or the lead-acid battery;

[0053] 3) After the power battery system detects and determines that the circuit is normal, the pre-charging process of the power battery is started and high voltage is applied;

[0054] If the whole machine is in walking working mode + pure electric state, the whole machine can start walking after completing the above process;

[0055] If the machine is in walking working mode + range extender status, continue with the following process:

[0056] 4) After the power battery is charged to high voltage, start the pre-charging process of the range extender and its cooling system branch until the pre-charging is completed;

[0057] 5) Control the generator and the range extender starts working;

[0058] 6) Control the working state of the fan drive motor controller according to the engine water temperature;

[0059] If the machine is in operating mode + range extender status, the following process is executed:

[0060] 7) The pre-charging circuit of the operation drive system starts working;

[0061] If the whole machine is in the working mode + pure electric state, then directly execute process 7) after completing process 3);

[0062] If the vehicle power supply function is enabled on the whole machine, the following process needs to be executed:

[0063] 8) Start the pre-charging process of the rectifier and inverter branches;

[0064] If the device is in AC charging mode, the following process is executed:

[0065] 1) If the power battery is charged with AC power without being powered off, only the pre-charging process of the rectifier and inverter systems needs to be executed;

[0066] 2) If the device is in sleep mode, plugging the AC charging cable into the AC charging port will wake it up and start the low-voltage power supply system.

[0067] 3) The power battery system is awakened, K40 is directly closed, and then the power battery high-voltage process is executed;

[0068] 4) After the power battery is charged with high voltage, it can interact with external AC charging equipment.

[0069] The flexibility of this control mode reduces the coupling between the high-voltage components of the entire machine, thereby improving the reliability of the entire machine.

Claims

1. A complete engineering machine, characterized in that: It includes a power battery system, a power distribution component, a range extender and its heat dissipation system, a travel system, an operating device drive system, a rectifier and inverter system, and a low-voltage power supply system; the power distribution component includes a pre-charging circuit and relays, which are used to distribute the high-voltage power source to various electrical systems, including the range extender and its heat dissipation system pre-charging circuit, the travel system relay, the operating drive system pre-charging circuit, and the rectifier and inverter system pre-charging circuit. The pre-charging circuits and relays are connected in parallel.

2. The complete engineering machine according to claim 1, characterized in that: The power battery system includes a power battery, a battery thermal management system, and a pre-charging circuit. The power battery system can independently provide a high-voltage power source for the entire machine.

3. The complete engineering machine according to claim 1, characterized in that: The range extender and its heat dissipation system include an engine, a generator, a generator controller, a fan drive motor, and a fan drive motor controller.

4. The complete engineering machine according to claim 3, characterized in that: The range extender and its heat dissipation system pre-charging circuit are divided into two branches at the rear end of the pre-charging circuit, and simultaneously provide a high-voltage power source for the generator controller and the fan drive motor controller.

5. The complete engineering machine according to claim 1, characterized in that: The walking system is used to move the entire machine, including a drive motor power module, a drive motor power module, a first walking motor, a second walking motor, a mechanical transmission component and a walking domain controller; the first walking motor and the second walking motor are left and right drive motors or front and rear drive motors.

6. The complete engineering machine according to claim 1, characterized in that: The operating device drive system is used to meet different operating drive requirements of the entire engineering machinery, and includes an all-in-one drive system, a first operating drive motor, a second operating drive motor and mechanical transmission components.

7. The complete engineering machine according to claim 1, characterized in that: The rectifier and inverter system is used to realize the interactive use of the whole machine and external AC power, including ACDC+DCAC module, AC charging interface, other AC power systems and system controller.

8. The complete engineering machine according to claim 1, characterized in that: The low-voltage power supply system is used to provide low-voltage power for the entire machine, including a low-voltage DCDC, a lead-acid battery and a low-voltage load; wherein the low-voltage DCDC and the lead-acid battery are connected in parallel to provide low-voltage power for the low-voltage load.

9. The complete engineering machine according to claim 1, characterized in that: The entire construction machinery includes four modes: walking working mode, operating working mode, AC charging mode and vehicle power supply function; among them, the walking working mode, operating working mode and vehicle power supply function can be in pure electric state or range extender state; the AC charging mode can only work in pure electric state.

10. A control method for an engineering machine according to any one of claims 1 to 9, characterized in that: include: 1) The whole machine issues a low-voltage power-on command, and the lead-acid battery in the low-voltage power supply system provides low-voltage power to the whole machine, then closes the relay and wakes up the power battery system at the same time; 2) The low-voltage DC / DC converter in the low-voltage power supply system starts to work and is used to charge the low-voltage load of the entire machine or the lead-acid battery; 3) After the power battery system detects and determines that the circuit is normal, the pre-charging process of the power battery is started and high voltage is applied; If the whole machine is in walking working mode + pure electric state, the whole machine can start walking after completing the above process; If the machine is in walking working mode + range extender status, continue with the following process: 4) After the power battery is charged to high voltage, start the pre-charging process of the range extender and its cooling system branch until the pre-charging is completed; 5) Control the generator and the range extender starts working; 6) Control the working state of the fan drive motor controller according to the engine water temperature; If the machine is in operating mode + range extender status, the following process is executed: 7) The pre-charging circuit of the operation drive system starts working; If the whole machine is in the working mode + pure electric state, then directly execute process 7) after completing process 3); If the vehicle power supply function is enabled on the whole machine, the following process needs to be executed: 8) Start the pre-charging process of the rectifier and inverter branches; If the device is in AC charging mode, the following process is executed: 1) If the power battery is charged with AC power without being powered off, the pre-charging process of the rectifier and inverter system is executed; 2) If the whole machine is in sleep mode, wake it up and start the low-voltage power supply system; 3) The power battery system is awakened, K40 is directly closed, and the power battery high-voltage process is executed; 4) After the power battery is charged with high voltage, it can interact with external AC charging equipment.

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