CN115610212A - Drive system of pure electric mining AC dump truck with modular configuration of power battery - Google Patents

Abstract

A pure electric mining AC dump truck drive system with power batteries that can be configured in a modular manner. The system includes a vehicle controller, including an external power supply access system, a variable frequency drive system, a vehicle auxiliary operation system, and a power system that are electrically connected in sequence. The vehicle controller monitors the running status of the power system, variable frequency drive system, external power supply access system, and vehicle auxiliary operation system in real time through the CAN communication bus, and sends control commands to each system according to the driver's operating instructions and the status of each system , so that all systems work together; with the present invention, the modular configuration of the power battery of the mining electric transmission dump truck with a load of 110t to 300t and above can be realized. Electrified operation helps to reduce mine fuel consumption, reduce mine production costs, and at the same time realize the green development of mines.

Description

Drive system of pure electric mining AC dump truck with modular configuration of power battery

technical field

The invention relates to a drive system of a pure electric mine AC dump truck, in particular to a drive system of a pure electric mine AC dump truck with modular configuration of power batteries.

Background technique

At present, large mining dump trucks with a load of 110t to 300t and above are widely used in large-scale open-pit mining and construction of water conservancy and hydropower facilities, and undertake the task of mineral and earthwork transportation. The power source of early large-scale mining dump trucks was mainly powered by diesel engines. The transmission methods of the vehicles mainly include mechanical transmissions in which the diesel engine drives the rear wheels to rotate through the gearbox, or the diesel engine drives the generator to generate electricity and drives the rear wheels to rotate through electric energy. Two types of electric drive. Regardless of the driving method, the diesel engine is used as the power source.

In recent years, with the development of the new energy industry, the power system of mining dump trucks with a load of 110t and below has been replaced by pure electricity. For large mining dump trucks with a load of more than 110t to 300t and above, It is difficult to realize the pure electric replacement of the vehicle power system. The reasons are: (1) The busbar voltage of large mining dump trucks is above 1000V. With the current technical state of lithium batteries, it will cost a lot of money to realize it; (2) The direct parallel connection of multi-branch batteries brings The voltage equalization problem of the battery pack is difficult to solve and cannot meet the driving power requirements of the vehicle.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a drive system for a pure electric mining AC dump truck with modular configuration of power batteries.

The technical solution adopted by the present invention to solve the technical problem is that the power battery can be modularly configured for pure electric mining AC dump truck drive system, the system includes a vehicle controller, and also includes an external power supply access system that is electrically connected in sequence, a frequency conversion Drive system, vehicle auxiliary operation system, and power system, the vehicle controller monitors the operating status of the power system, variable frequency drive system, external power supply access system, and vehicle auxiliary operation system in real time through the CAN communication bus, and The operating instructions and the status of each system issue control instructions to each system to make each system work together;

The power system is composed of a plurality of power sub-modules, and each sub-module is composed of a power battery pack, a battery thermal management system, a battery high-voltage power distribution cabinet, and a bidirectional DCDC; Multiple power sub-modules are configured according to the different demands of power and power, and the battery type and battery rated voltage level of each power sub-module may be different from other power battery sub-modules. The vehicle controller also has energy management functions. The vehicle controller collects the SOC of each battery pack, and when the vehicle is running, each group controls the discharge power of the two-way DCDC according to this, and finally achieves the same remaining power of each battery pack during the discharge process. The purpose of the power system; the output end of the power system is the high-voltage busbar of the whole vehicle, which provides power supply for the variable frequency drive system and the vehicle auxiliary operation system through the high-voltage busbar;

The frequency conversion drive system is composed of a braking resistor box, a left-wheel traction frequency converter, a right-wheel traction frequency converter, a left-wheel traction motor, and a right-wheel traction motor;

The vehicle auxiliary operation system is composed of auxiliary power supply, hydraulic oil pump motor and oil pump motor driver, vehicle thermal management system, 24V low-voltage power supply system, and cabin air-conditioning system; the auxiliary power supply reduces the high-voltage power supply to a low-voltage power supply, And released on the low-voltage bus, the oil pump motor driver, vehicle thermal management system, 24V low-voltage power supply system, cabin air-conditioning system and battery thermal management system are all powered by the low-voltage bus;

The output end of the external power access system is also a high-voltage bus, and the external power is connected to the high-voltage bus.

Further, the external power supply access system includes a main positive contactor, a main negative contactor, a pre-charging circuit, an external voltage sensor, a current sensor for the vehicle-mounted power receiving interface, a temperature sensor for the vehicle-mounted power receiving interface, a force sensor for the vehicle-mounted power receiving interface, and External power supply system communication module; the external power supply access system is connected to the external power supply system through the vehicle power receiving interface, and the vehicle controller obtains the vehicle power receiving interface and The connection status information of the external power supply system, and read the parameters of the external power supply system through the external power supply system communication module to judge whether the external power supply can be enabled. If the external power supply can be enabled, first close the main negative contactor, and then connect the pre-charging circuit . When the voltage of the high-voltage bus is slightly lower than the voltage of the external power supply system, the external power supply is connected to the main positive contactor of the system to complete the electrical connection between the high-voltage bus and the external power supply system.

Furthermore, the high-voltage bus is the physical connection entity of each system, and the power system releases energy to the high-voltage bus to provide power for the variable frequency drive system and the vehicle auxiliary operation system.

Further, the braking resistor box, the left-wheel traction frequency converter, and the right-wheel traction frequency converter are mounted on the high-voltage bus: when the vehicle is towing, the left-wheel traction frequency converter and the right-wheel traction frequency converter respectively drive the left-wheel traction motor and the right-wheel traction The motor rotates to drive the vehicle forward; when the vehicle is electrically braked, the left wheel traction motor and the right wheel traction motor are converted into generators, and after the kinetic energy of the vehicle is converted into electrical energy, it is rectified by the left wheel traction frequency converter and the right wheel traction frequency converter respectively, and released to the high voltage bus.

Further, the output end of the bidirectional DCDC of each power battery sub-module is connected in parallel to the high-voltage bus of the vehicle, and the rated voltage of the high-voltage bus may not be equal to the rated voltage of each power battery sub-module.

Further, the power system can be configured with a variety of power sub-modules according to the different requirements of the pure electric mining AC dump truck for the power and power of the power system, so as to achieve the purpose of different power and power requirements.

Further, the external power access system can introduce an external qualified power source into the high-voltage bus of the vehicle, through which the power battery can be charged through bidirectional DCDC. The vehicle can also be driven forward by the left-wheel traction frequency converter and the right-wheel traction frequency converter, and the vehicle auxiliary system can be powered by the auxiliary machine power supply to realize the external power supply operation of the vehicle.

Further, the vehicle controller also has energy management functions. The vehicle controller calculates the power of each battery pack by collecting the SOC of each battery pack. When the vehicle is towing, it controls the discharge power of the bidirectional DCDC according to this, and finally achieves discharge The purpose of equalizing the SOC of each battery pack in the process.

The present invention can realize the modular configuration of the power battery of the mining electric transmission dump truck with a load of 110t to 300t and above, and perform on-demand configuration according to the different demands of the vehicle on the power battery, so as to realize the purely electrified operation of the vehicle. Through the external power supply access system, it is possible to build a wire grid along the road to supply power to the vehicle, so as to realize the external power supply operation of the pure electric vehicle. The wide application of this invention helps to reduce mine fuel consumption, reduce mine production costs, and at the same time realize the green development of mines.

Description of drawings

Fig. 1 is a structural block diagram of an embodiment of the present invention.

In the figure: 01-vehicle controller, 02-external power supply access system, 03-variable frequency drive system, 04-power system, 05-vehicle auxiliary operation system, 06-high voltage bus, 07-low voltage bus, 08-left wheel frequency conversion 09-left wheel motor, 10-right wheel inverter, 11-right wheel motor, 12-braking resistor box, 13-auxiliary power supply. 14-oil pump motor driver, 15-oil pump motor, 16-24V low-voltage power supply system, 17-cabin air conditioning system, 18-vehicle thermal management system, 19-vehicle power receiving interface, 20-charging control cabinet, 21-battery pack, 22-power distribution cabinet, 23-bidirectional DCDC, 24 battery thermal management system, 25-power battery sub-module. 26-vehicle power receiving interface force sensor, 27-vehicle power receiving interface temperature sensor, 28-external voltage sensor, 29-vehicle power receiving interface current sensor, 30-external power supply access system main positive contactor, 31-external power supply connection Input system main and negative contactors, 33-communication module of external power supply system.

detailed description

The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

Referring to Figure 1, this embodiment includes an external power supply access system 02, a variable frequency drive system 03, a vehicle auxiliary operation system 05, and a power system 04 that are electrically connected in sequence. This embodiment also includes a complete vehicle controller 01, which monitors the running status of the power system 04, the variable frequency drive system 03, the external power supply access system 02, and the vehicle auxiliary operation system 05 in real time through the CAN communication bus, and According to the driver's operation instructions and the status of each system, control instructions are issued to each system to make each system work together.

The vehicle controller 01 has a multi-channel I/O interface and a CAN communication interface, and is the center of the vehicle control system. The core component of the work; it is the main control component to realize functions such as vehicle driving, regenerative braking and battery charging, fault diagnosis and treatment, and vehicle status monitoring.

The vehicle controller 01 mainly collects vehicle accelerator pedal, electric brake pedal information and various control switch signals on the instrument panel through the I/O interface, and analyzes the driver's operation intention based on this, and finally converts it into The control requirements of each system of the vehicle. At the same time, the vehicle controller detects the working status of the power system, variable frequency drive system, external power supply access system, and vehicle auxiliary operation system in real time through the CAN communication bus, and performs intelligent regulation to make them work together. The specific structure of the vehicle controller 01 It is a prior art, and will not be described in detail here.

The power system 04 is composed of multiple power sub-modules 25 , and each sub-module is composed of a power battery pack 21 , a battery thermal management system 24 , a battery high-voltage power distribution cabinet 22 , and a bidirectional DCDC 23 . The power system 02 can be configured with a variety of power sub-modules according to the different requirements of the pure electric mining AC dump truck for electricity and power, so as to achieve the purpose of different electricity and power requirements.

The output end of the power system 04 is the high-voltage bus 06 of the whole vehicle, through which the variable frequency drive system 03 and the vehicle auxiliary operation system 05 are provided with power supply.

The frequency conversion drive system 03 is composed of a braking resistor box 12, a left wheel traction frequency converter 08, a right wheel traction frequency converter 10, a left wheel traction motor 09, and a right wheel traction motor 11.

The vehicle auxiliary operation system 05 is composed of an auxiliary power supply 13 , a hydraulic oil pump motor 15 and an oil pump motor driver 14 , a vehicle thermal management system 18 , a 24V low-voltage power supply system 16 , and a cabin air-conditioning system 17 .

The external power supply access system 02 is composed of a high-voltage control cabinet 19 and a vehicle-mounted power receiving interface 20. The output end of the external power supply access system 02 is also a high-voltage bus 06, and the external power supply is connected to the high-voltage bus 06.

The vehicle controller 01 is the core component of the whole system. The vehicle controller 01 monitors the running status of the power system 04, the variable frequency drive system 03, the external power supply access system 02, and the vehicle auxiliary operation system 05, and The operating instructions and the status of each system issue control instructions to each system to make each system work together.

The power battery pack 21, battery thermal management system 24, and battery high-voltage power distribution cabinet 23 of each power battery sub-module 25 are isolated from the power battery pack 21, battery thermal management system 24, and battery high-voltage power distribution cabinet of other power battery sub-modules 23. The battery type and rated voltage level of each power battery sub-module 25 may be different. The output end of the bidirectional DCDC 23 of each power battery sub-module 25 is connected in parallel to the high-voltage bus 06 of the vehicle, and the rated voltage of the high-voltage bus 06 may not be equal to the rated voltage of each power battery sub-module 25 .

The power system 04 can be configured with a variety of power sub-modules 25 according to the different requirements of the pure electric mining AC dump truck for the power and power of the power system, so as to achieve the purpose of different power and power requirements.

The vehicle controller 01 also has energy management functions. The vehicle controller 01 calculates the power of each battery pack 21 by collecting the SOC of each battery pack 21. When the vehicle is towing, each group controls the discharge power of the bidirectional DCDC 23 accordingly. , and finally achieve the purpose of equalizing the 21 SOC of each battery pack during the discharge process;

The high-voltage bus 06 is the physical connection entity of each system, and the power system 04 releases energy to the high-voltage bus 06 to provide power supply for the variable frequency drive system 03 and the vehicle auxiliary operation system 05;

The brake resistor box 12, the left wheel traction frequency converter 08, and the right wheel traction frequency converter 10 in the frequency conversion drive system 03 are mounted on the high-voltage bus: when the vehicle is towing, it is driven by the left wheel traction frequency converter 08 and the right wheel traction frequency converter 10 respectively The left-wheel traction motor 09 and the right-wheel traction motor 11 rotate to drive the vehicle forward; when the vehicle brakes, the left-wheel traction motor 09 and the right-wheel traction motor 11 become generators, and after the kinetic energy of the vehicle is converted into electric energy, the left-wheel traction inverter 08. After rectification by the right wheel traction frequency converter 10, it is released to the high-voltage bus 06;

When the vehicle is braking, the vehicle controller 01 collects the SOC of each battery pack 21 to calculate the power of each battery pack 21, and accordingly each pack controls the charging power of the bidirectional DCDC 23, and drives the left wheel of the vehicle. The wheel traction inverter 10 releases the energy recovered on the high-voltage bus 06 to achieve the purpose of vehicle braking energy recovery, and in the process of recharging, ensure that the SOC of each power battery pack 21 is equal.

If the power system 04 cannot recover all the braking energy, the vehicle controller 01 controls the high-voltage bus 06 to connect the braking resistor box 12 to release the energy that cannot be recovered in the form of heat, thereby ensuring that the vehicle has enough power. Braking force.

The vehicle auxiliary operation system 05 uses the auxiliary power supply 13 to reduce the high-voltage power supply to a low-voltage power supply and release it on the low-voltage bus 07, the oil pump motor driver 14, the vehicle thermal management system 18, the 24V low-voltage power supply system 16, and the cabin air-conditioning system 17 And the battery thermal management system 24 is powered by the low-voltage bus.

The vehicle controller 01 monitors the vehicle status in real time, and cooperates with the driver's operation instructions, controls the hydraulic oil pump motor 15 through the oil pump motor driver 14 to provide power for the vehicle hydraulic system, controls the operation of the vehicle thermal management system 18, and controls the cockpit air conditioning system 17 Adjust the cab temperature.

The external power supply access system 02 can introduce the external qualified power supply into the high-voltage bus 06 of the vehicle, and the bidirectional DCDC 23 uses the energy on the high-voltage bus 06 to charge the battery pack 21 . The left-wheel traction frequency converter 08 and the right-wheel traction frequency converter 09 can also use the energy on the high-voltage bus 06 to drive the vehicle forward, and the auxiliary power supply 13 can also use the energy on the high-voltage bus 06 to supply power to the vehicle auxiliary operation system 05.

External power supply access system 02 includes main positive contactor 30, main negative contactor 31, pre-charging circuit 32, external voltage sensor 28, vehicle-mounted power receiving interface current sensor 29, vehicle-mounted power receiving interface temperature sensor 27, vehicle-mounted power receiving interface force Sensor 26 function and external power supply system communication module 33;

The external power supply access system 02 is connected to the external power supply system through the vehicle-mounted power receiving interface 19, and the vehicle controller 01 obtains the vehicle-mounted power receiving interface 19 through the external voltage sensor 28, the vehicle-mounted power receiving interface temperature sensor 27, and the vehicle-mounted power receiving interface force sensor 26. The connection state information with the external power supply system, and read the external power supply system parameters through the external power supply system communication module 33 to judge whether the external power supply can be enabled. If the external power supply can be enabled, then first close the main negative contactor 31.

After the vehicle-mounted power receiving interface 19 is connected to the external power supply system, if the bidirectional DCDC 23 is in the discharge state, first close the main negative contactor 31 of the external power supply access system to adjust the discharge voltage of the bidirectional DCDC 23 so that the voltage of the high-voltage bus 06 is slightly lower than that of the external After the system voltage is supplied, the external power supply is connected to the main positive contactor 30 of the system, so that the high-voltage bus 06 is electrically connected to the external power supply system.

After the vehicle-mounted power receiving interface 19 is docked with the external power supply system, when the bidirectional DCDC 23 is in a shutdown state, first close the main negative contactor 31 of the external power supply access system, and then start the pre-charging circuit 32 . When the voltage of the high-voltage bus 06 is slightly lower than the voltage of the external power supply system, the external power supply is connected to the main positive contactor 30 of the system to complete the electrical connection between the high-voltage bus 06 and the external power supply system.

This embodiment can realize the pure electric operation of large-scale dump trucks with a load exceeding 110t to 300t and above for open-pit mines or water conservancy and hydropower construction, which helps to reduce mine fuel consumption and reduce production costs in mines and water conservancy and hydropower construction processes. Green development of mines.

Those skilled in the art can carry out various modifications and variations to the present invention, if these modifications and variations are within the scope of the claims of the present invention and equivalent technologies thereof, then these modifications and variations are still within the protection scope of the patent for the present invention .

The content not described in detail in the specification is the prior art known to those skilled in the art.

Claims (8)

1. The pure electric mining alternating current dump truck driving system with the power battery capable of being configured in a modularized mode comprises a whole vehicle controller and is characterized in that: the vehicle control unit monitors the running states of the power system, the variable frequency driving system, the external power access system and the vehicle auxiliary operation system in real time through a CAN communication bus, and sends control instructions to the systems according to the operating instructions of a driver and the states of the systems so that the systems work cooperatively;

the power system comprises a plurality of power sub-modules, and each sub-module consists of a power battery pack, a battery thermal management system, a battery high-voltage power distribution cabinet and a bidirectional DCDC; the vehicle control unit has an energy management function, controls the discharge power of each group of bidirectional DCDCDCDC by collecting the SOC of each battery pack when the vehicle runs, and finally achieves the purpose of equalizing the residual electric quantity of each battery pack in the discharge process; the output end of the power system is a whole vehicle high-voltage bus, and a power supply is provided for the variable-frequency driving system and the vehicle auxiliary operation system through the high-voltage bus;

the variable frequency driving system consists of a brake resistance box, a left wheel traction frequency converter, a right wheel traction frequency converter, a left wheel traction motor and a right wheel traction motor;

the vehicle auxiliary operation system consists of an auxiliary engine power supply, a hydraulic oil pump motor, an oil pump motor driver, a whole vehicle heat management system, a 24V low-voltage power supply system and a cabin air conditioning system; the auxiliary engine power supply reduces the voltage of the high-voltage power supply to a low-voltage power supply and releases the low-voltage power supply on a low-voltage bus, and an oil pump motor driver, a whole vehicle heat management system, a 24V low-voltage power supply system, a cabin air conditioning system and a battery heat management system are all powered by the low-voltage bus;

the output end of the external power supply access system is also a high-voltage bus, and an external power supply is accessed to the high-voltage bus.

2. The alternating-current dumper driving system for pure electric mines with the modularly configurable power batteries according to claim 1, wherein the alternating-current dumper driving system comprises: the external power supply access system comprises a main positive contactor, a main negative contactor, a pre-charging circuit, an external voltage sensor, a vehicle-mounted power receiving interface current sensor, a vehicle-mounted power receiving interface temperature sensor, a vehicle-mounted power receiving interface force sensor function and an external power supply system communication module; the external power supply access system is in butt joint with the external power supply system through the vehicle-mounted power receiving interface, the vehicle controller acquires connection state information of the vehicle-mounted power receiving interface and the external power supply system through the external voltage sensor, the vehicle-mounted power receiving interface temperature sensor and the vehicle-mounted power receiving interface force sensor, and reads parameters of the external power supply system through the external power supply system communication module to judge whether the external power supply can be started, if the external power supply can be started, the main negative contactor is closed firstly, then the pre-charging circuit is switched on, when the voltage of the high-voltage bus is slightly lower than the voltage of the external power supply system, the main positive contactor of the external power supply access system is switched on, and the high-voltage bus and the external power supply system are enabled to complete electrical butt joint.

3. A pure electric mining alternating current dump truck driving system with a modularly configurable power battery according to claim 1 or 2, characterized in that: the high-voltage bus is a physical connection entity of each system, and the power system releases energy to the high-voltage bus to provide a power supply for the variable-frequency driving system and the vehicle auxiliary operation system.

4. A pure electric mining alternating current dump truck driving system with a modularly configurable power battery according to claim 1 or 2, characterized in that: brake resistance case, left wheel pull converter, right wheel pull the converter and mount on high-voltage bus: when the vehicle is towed, the left wheel towing frequency converter and the right wheel towing frequency converter respectively drive the left wheel towing motor and the right wheel towing motor to rotate so as to drive the vehicle to advance; when the vehicle is electrically braked, the left wheel traction motor and the right wheel traction motor are converted into generators, kinetic energy of the vehicle is converted into electric energy, and the electric energy is rectified by the left wheel traction frequency converter and the right wheel traction frequency converter respectively and then released to a high-voltage bus.

5. A pure electric mining alternating current dump truck driving system with a modularly configurable power battery according to claim 1 or 2, characterized in that: the output end of the bidirectional DCDC of each power battery submodule is connected in parallel to a high-voltage bus of the whole vehicle, and the rated voltage of the high-voltage bus and the rated voltage of each power battery submodule can be unequal.

6. A pure electric mining alternating current dump truck driving system with a modularly configurable power battery according to claim 1 or 2, characterized in that: the power system can carry out various power submodule configurations according to different requirements of the pure electric mining alternating current dump truck on the electric quantity and the power of the power system, so that the requirements of vehicles with different loads on the electric quantity and the power are met.

7. A pure electric mining alternating current dump truck driving system with a modularly configurable power battery according to claim 1 or 2, characterized in that: the external power supply access system can introduce an external power supply meeting requirements into a vehicle high-voltage bus, the high-voltage bus can charge a power battery through a bidirectional DCDC, the vehicle can be driven to advance by a left-wheel traction frequency converter and a right-wheel traction frequency converter, and the auxiliary power supply can supply power to a vehicle auxiliary system through an auxiliary power supply, so that the external power supply of the vehicle can be powered and operated.

8. A pure electric mining alternating current dump truck driving system with a modularly configurable power battery according to claim 1 or 2, characterized in that: the vehicle control unit has an energy management function, calculates the electric quantity of each battery pack by acquiring the SOC of each battery pack, and controls the discharge power of the bidirectional DCDC when the vehicle is pulled, so that the purpose of equalizing the SOC of each battery pack in the discharge process is finally achieved.

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