CN112549993A

CN112549993A - Vehicle driving device, driving method, vehicle, driving apparatus, and storage medium

Info

Publication number: CN112549993A
Application number: CN202011483229.7A
Authority: CN
Inventors: 李坤; 满军城; 戚建
Original assignee: Sany Heavy Equipment Co Ltd
Current assignee: Sany Heavy Equipment Co Ltd
Priority date: 2020-12-16
Filing date: 2020-12-16
Publication date: 2021-03-26

Abstract

The invention provides a vehicle driving apparatus, a driving method, a vehicle, a driving device, and a storage medium. A vehicle drive device includes: the system comprises at least one first branch circuit, a main trunk circuit, at least one second branch circuit and a third branch circuit, wherein the first branch circuit comprises an engine, a generator and a first converter; the engine drives the generator to output alternating current, the first converter converts the alternating current into direct current and outputs the direct current to the main line, the main line is communicated with the first branch, the second branch and the third branch, the second branch converts the direct current of the main line into the alternating current and is used for driving a vehicle, and the third branch stores electric energy from the main line or releases the electric energy to the main line. According to the technical scheme, the third branch is arranged to store electric energy from the main road or release electric energy to the main road, so that fuel oil consumption of the engine is reduced to a great extent, and the purpose of improving the fuel utilization rate is achieved.

Description

Vehicle driving device, driving method, vehicle, driving apparatus, and storage medium

Technical Field

The present invention relates to the field of vehicle technologies, and in particular, to a vehicle driving device, a driving method, a vehicle, a driving apparatus, and a storage medium.

Background

At present, in a power system of an electric wheel dump truck, a high-power engine drives a generator, and electric energy is transmitted to a motor of a rear wheel through an electric control system to drive a vehicle to move forward, but the purchase and maintenance cost of the high-power engine is high.

Disclosure of Invention

The present invention is directed to solving at least one of the above problems.

To this end, a first object of the present invention is to provide a vehicle drive device.

A second object of the invention is to provide a vehicle driving method.

A third object of the present invention is to provide a vehicle.

A fourth object of the invention is to provide a vehicle drive apparatus.

A fifth object of the present invention is to provide a computer-readable storage medium.

To achieve the first object of the present invention, an embodiment of the present invention provides a vehicle drive apparatus including: the system comprises at least one first branch circuit, a main trunk circuit, at least one second branch circuit and a third branch circuit, wherein the first branch circuit comprises an engine, a generator and a first converter; the engine drives the generator to output alternating current, the first converter converts the alternating current into direct current and outputs the direct current to the main line, the main line is communicated with the first branch, the second branch and the third branch, the second branch converts the direct current of the main line into the alternating current and is used for driving a vehicle, and the third branch stores electric energy from the main line or releases the electric energy to the main line.

Through setting up the third branch road, the electric energy of storage coming from the main road or releasing the electric energy to the main road reduces the fuel consumption of engine to a great extent, reaches the purpose that improves fuel utilization.

In addition, the technical solution provided by the above embodiment of the present invention may further have the following additional technical features:

in the above technical solution, the second branch includes: a drive motor and a second converter; the second converter converts the direct current of the main circuit into alternating current and outputs the alternating current to the driving motor.

The second converter converts the direct current of the main trunk circuit into alternating current and outputs the alternating current to the driving motor, and the driving motor drives the vehicle to provide forward or backward power for the vehicle.

In any of the above technical solutions, the third branch includes: a third converter and a battery; the third converter converts the direct current of the main trunk circuit into direct current suitable for a battery, and the battery stores electric energy; or the battery releases electric energy, and the electric energy is output to the main trunk circuit through the third converter.

The battery collects the redundant energy of the generator set when the vehicle is in idle low power and the vehicle waits, and the battery also collects the electric energy generated when the driving motor of the vehicle is converted into electric brake in the downhill process, and when the vehicle is in the working condition of high power demand, the battery releases the electric energy, thereby reducing the fuel consumption of the engine.

In any of the above technical solutions, when the first branch is multiple, the first branch further includes: and the control switch is arranged on the first branch and used for controlling the connection or disconnection of the first branch and the trunk.

When any one of the first branches fails, the first branch is disconnected from the trunk circuit by disconnecting the control switch.

In any one of the above technical solutions, the vehicle driving apparatus further includes: and the fourth branch circuit comprises a fourth converter and a brake resistor, and the fourth converter converts the direct current of the main circuit into direct current suitable for the brake resistor and outputs the direct current to the brake resistor.

After the electric energy stored in the third branch reaches the upper limit, the redundant electric energy in the main line is consumed by setting the brake resistor.

To achieve the second object of the present invention, an embodiment of the present invention provides a vehicle driving method for a vehicle driving apparatus in any one of the embodiments of the present invention, including: controlling the rotating speed of the engine to be a first rotating speed based on the fact that the depth of an accelerator pedal of the vehicle is smaller than or equal to a depth threshold value, driving the vehicle through a second branch, and controlling a third branch to store electric energy through a main road when the power of the engine is larger than the traction power requirement of the vehicle; and controlling the rotating speed of the engine to be a second rotating speed based on the fact that the depth of the accelerator pedal of the vehicle is larger than the depth threshold value, driving the vehicle through the second branch, and controlling the third branch to release electric energy to the main trunk when the power of the engine is smaller than the traction power requirement of the vehicle, so that the sum of the power of the engine and the electric energy released by the third branch meets the traction power requirement of the vehicle.

According to different power required by vehicle load, the engine is set to two working states with consistent rotating speed, and the third branch circuit is matched to store electric energy or release electric energy, so that the fuel consumption of the engine is reduced, and the purpose of improving the fuel utilization rate is achieved.

in the above technical solution, the vehicle driving method further includes: and after the electric energy stored in the third branch is full, the electric energy is consumed through the brake resistor.

And after the electric energy stored in the third branch reaches the upper limit, the redundant electric energy in the main line is consumed through the brake resistor.

To achieve the third object of the present invention, an embodiment of the present invention provides a vehicle including: a vehicle body and a vehicle drive device as in any of the embodiments of the invention; wherein, the vehicle driving device is arranged on the vehicle body.

The vehicle provided by the embodiment of the invention comprises the vehicle driving device according to any embodiment of the invention, so that the vehicle driving device has all the beneficial effects of the vehicle driving device according to any embodiment of the invention, and the detailed description is omitted.

To achieve the fourth object of the present invention, an embodiment of the present invention provides a vehicle drive apparatus including: the device comprises a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program; wherein the processor, when executing the computer program, implements the steps of the vehicle driving method according to any of the embodiments of the present invention.

The vehicle driving apparatus provided by the embodiment of the invention implements the steps of the vehicle driving method according to any embodiment of the invention, and thus has all the beneficial effects of the vehicle driving method according to any embodiment of the invention, which are not described herein again.

To achieve the fifth object of the present invention, an embodiment of the present invention provides a computer-readable storage medium storing a computer program which, when executed, implements the steps of the vehicle driving method of any of the above-described embodiments.

The computer-readable storage medium provided in the embodiments of the present invention implements the steps of the vehicle driving method according to any one of the embodiments of the present invention, and thus has all the advantages of the vehicle driving method according to any one of the embodiments of the present invention, and details thereof are not repeated herein.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a driving schematic diagram of an electric wheel dump truck of the related art;

FIG. 2 is a schematic view of a vehicle drive apparatus according to an embodiment of the present invention;

FIG. 3 is one of the schematic diagrams of the first branch circuit according to one embodiment of the present invention;

FIG. 4 is a schematic diagram of a second branch circuit according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a third branch circuit according to an embodiment of the present invention;

FIG. 6 is a second schematic diagram of the first branch according to one embodiment of the present invention;

FIG. 7 is a diagram illustrating a fourth branch circuit according to an embodiment of the present invention;

FIG. 8 is a second schematic diagram of a fourth branch circuit according to an embodiment of the present invention;

FIG. 9 is a first flowchart of a method for driving a vehicle according to an embodiment of the present invention;

FIG. 10 is a flowchart of a vehicle driving method of one embodiment of the present invention;

FIG. 11 is a schematic illustration of a vehicle composition according to an embodiment of the present invention;

fig. 12 is a schematic composition diagram of a vehicle drive apparatus according to an embodiment of the invention;

fig. 13 is a schematic structural view of a vehicle drive apparatus according to an embodiment of the invention;

fig. 14 is a schematic diagram of a vehicle driving apparatus according to an embodiment of the invention;

FIG. 15 is a schematic diagram of an engine fuel consumption curve and speed selection according to an embodiment of the present invention.

Wherein, the corresponding relation between the reference numbers and the part names in fig. 1 is:

100': an engine, 110': generator, 120': AC/DC rectification module, 130': DC/AC inverter module, 140': a wheel motor.

Wherein, the correspondence between the reference numbers and the part names in fig. 2 to 15 is:

100: vehicle drive device, 110: first branch, 112: engine, 114: generator, 116: first converter, 120: trunk, 130: second branch, 132: drive motor, 134: second converter, 140: third branch, 142: third converter, 144: battery, 150: control switch, 160: fourth branch, 162: fourth converter, 164: brake resistance, 166: first generator set, 168: second generator set, 170: first rectifying device, 172: second rectifying device, 174: first generator set, 176: second genset, 178: first rectification system, 180: second rectification system, 182: first drive motor, 184: first inverter unit, 186: second drive motor, 188: second inverter unit, 190: chopper, 192: brake resistance, 194: charging and discharging machine, 196: battery pack, 200: vehicle, 210: vehicle body, 300: vehicle drive apparatus, 310: memory, 320: a processor.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

A vehicle driving apparatus 100, a vehicle driving method, a vehicle 200, a vehicle driving device 300, and a computer-readable storage medium according to some embodiments of the invention are described below with reference to fig. 1 to 15.

The electric wheel dumper has the characteristics of large transportation capacity and high working efficiency. In the transportation equipment for annual mining of large-scale surface mines of more than ten million tons, the electric wheel dump trucks occupy the market of nearly seven-generation, and bear the mining and transportation volume of four-generation coal and most iron ores in the world. The technical route of the power system of the prior electric wheel dumper is that a high-power engine drives a generator, and electric energy is transmitted to a motor of a rear wheel through an electric control system to drive a vehicle to move forward. However, the high-power engine generally needs to be imported, the purchase and maintenance cost is high, the effective working time of the engine is only 20% -35% according to the working characteristics of surface mine transportation equipment, the rest time is mainly downhill braking, waiting and loading and unloading time, and the fuel utilization rate of the engine has a large promotion space.

As shown in fig. 1, the conventional electric wheel dumper adopts a technical route that an inlet high-horsepower engine 100 'and an inlet main generator 110' are adopted, the generator 110 'generates alternating current, and controllable electric energy is obtained through an AC/DC rectification module 120' and a plurality of DC/AC inversion modules 130 ', so as to drive a plurality of wheel motors 140' to provide forward and backward power for a vehicle.

In summary, the present embodiment aims to solve at least one of the following problems:

(1) high power engine 100' is expensive to procure and maintain;

(2) the high power engine 100' has a low fuel utilization.

Example 1:

as shown in fig. 2 and 3, the present embodiment provides a vehicle drive device 100 including: at least one first branch 110, a main trunk 120, at least one second branch 130, and a third branch 140, the first branch 110 including an engine 112, a generator 114, and a first converter 116; the engine 112 drives the generator 114 to output alternating current, the first converter 116 converts the alternating current into direct current and outputs the direct current to the main circuit 120, the main circuit 120 is communicated with the first branch circuit 110, the second branch circuit 130 and the third branch circuit 140, the second branch circuit 130 converts the direct current of the main circuit 120 into alternating current for driving the vehicle 200, and the third branch circuit 140 stores electric energy from the main circuit 120 or releases the electric energy to the main circuit 120.

For example, the vehicle 200 in this embodiment may be an electric wheel dump truck, and the weight of the electric wheel dump truck is 100 tons to 363 tons.

In this embodiment, when the number of the first branch circuits 110 is one, one engine 112 and one generator 114 are used to meet the power demand of the vehicle 200.

When the number of the first branch circuits 110 is multiple, the total power of the plurality of engines 112 meets the power requirement of the vehicle 200, the engines 112 of the first branch circuits 110 drive the generators 114 to output alternating current, the first converter 116 converts the alternating current into direct current, performs direct current grid connection, and outputs the direct current to the main trunk circuit 120, and the combination of the plurality of engines 112 and the plurality of generators 114 is adopted to replace the high-power engines and generators, so that the manufacturing cost and the maintenance cost of the vehicle 200 are reduced, and the performance of the vehicle 200 is not reduced.

In this embodiment, the number of the second branch circuits 130 may be two, and the two branch circuits may be used for driving the vehicle 200.

In the embodiment, the third branch 140 is arranged to store the electric energy from the main trunk 120 or release the electric energy to the main trunk 120, so that the fuel consumption of the engine is reduced to a great extent, and the purpose of improving the fuel utilization rate is achieved.

Example 2:

as shown in fig. 4, in addition to the technical features of the above embodiment, the present embodiment further includes the following technical features:

the second branch circuit 130 includes: a drive motor 132 and a second converter 134; the second converter 134 converts the dc power of the main line 120 into ac power and outputs the ac power to the drive motor 132.

The second converter 134 converts the dc power of the main line 120 into ac power, and outputs the ac power to the driving motor 132, and the driving motor 132 drives the vehicle 200 to provide the vehicle 200 with forward or backward power.

Example 3:

as shown in fig. 5, in addition to the technical features of the above embodiment, the present embodiment further includes the following technical features:

the third branch 140 includes: a third converter 142 and a battery 144; wherein, the third converter 142 converts the dc power of the main circuit 120 into dc power suitable for the battery 144, and the battery 144 stores electric energy; alternatively, the battery 144 discharges the electric power, and the electric power is output to the trunk circuit 120 through the third converter 142.

In this embodiment, the battery 144 may be a battery pack.

The battery 144 collects excess energy from the genset, i.e., the engine 112 and the generator 114, of the vehicle 200 during low power idling and waiting of the vehicle 200, and from the conversion of the drive motor 132 into electric braking during downhill descent of the vehicle 200, and the battery 144 discharges the electric energy when the vehicle 200 is in a condition of high power reloading demand, thereby reducing fuel consumption of the engine 112.

Example 4:

as shown in fig. 6, in addition to the technical features of the above embodiment, the present embodiment further includes the following technical features:

when the first branch circuit 110 is plural, the first branch circuit 110 further includes: and the control switch 150 is arranged on the first branch circuit 110, and is used for controlling the connection or disconnection between the first branch circuit 110 and the trunk circuit 120.

When a plurality of first branches 110 are used, a control switch 150 is provided on each first branch 110, and when the first branch 110 fails, the first branch 110 is disconnected from the trunk 120 by opening the control switch 150.

Example 5:

as shown in fig. 7 and 8, in addition to the technical features of the above embodiment, the present embodiment further includes the following technical features:

the vehicle drive device 100 further includes: and a fourth branch 160, wherein the fourth branch 160 includes a fourth converter 162 and a braking resistor 164, and the fourth converter 162 converts the dc power of the main trunk 120 into dc power suitable for the braking resistor 164 and outputs the dc power to the braking resistor 164.

For example, after the energy stored in the third branch 140 reaches the upper limit, the braking resistor 164 is set to consume the excess energy in the main trunk 120.

Example 6:

as shown in fig. 9, the present embodiment provides a vehicle driving method for a vehicle driving apparatus 100 in any embodiment of the invention, including the steps of:

step S102, controlling the rotating speed of the engine to be a first rotating speed based on that the depth of an accelerator pedal of the vehicle is smaller than or equal to a depth threshold value, driving the vehicle through a second branch, and controlling a third branch to store electric energy through a main trunk when the power of the engine is larger than the traction power requirement of the vehicle;

and step S104, controlling the rotating speed of the engine to be a second rotating speed based on the fact that the depth of the accelerator pedal of the vehicle is larger than the depth threshold value, driving the vehicle through the second branch, and controlling the third branch to release electric energy to the main road when the power of the engine is smaller than the traction power requirement of the vehicle, so that the sum of the power of the engine and the electric energy released by the third branch meets the traction power requirement of the vehicle.

In the present embodiment, the engine is set to two operating states with the same rotational speed, i.e., the high-power optimum economy rotational speed (second rotational speed) and the low-power fuel-saving rotational speed (first rotational speed), according to the power required by the load of the vehicle 200.

For example, the depth threshold of the throttle of the vehicle 200 may be set as: 30% of the throttle depth, i.e. the throttle depth ranges from 0% to 30% for 800rpm to 1400rpm, 30% to 100% for 1400rpm to 1800 rpm. The first rotation speed may be set to 800rpm to 1400rpm, and the second rotation speed may be set to 1400rpm to 1800 rpm.

When the depth of the accelerator pedal of the vehicle 200 is less than or equal to the depth threshold, the rotating speed of the engine 112 is controlled to be a first rotating speed, namely, a low-power oil-saving rotating speed, the third branch 140 stores electric energy through the main trunk 120, when the depth of the accelerator pedal of the vehicle 200 is greater than the depth threshold, the rotating speed of the engine 112 is controlled to be a second rotating speed, namely, a high-power optimal economic rotating speed, the third branch 140 releases electric energy to the main trunk 120, and the released electric energy drives the driving motor 132, so that the high-power requirement of the vehicle 200 is met.

By setting the optimal economic rotation speed of high power and the oil-saving rotation speed of low power, and matching with the third branch 140 to store or release electric energy, the fuel consumption of the engine 112 is reduced, and the purpose of improving the fuel utilization rate is achieved.

Example 7:

as shown in fig. 10, in addition to the technical features of the above embodiment, the present embodiment further includes the following technical features:

the vehicle driving method further includes the steps of:

step S202: and after the electric energy stored in the third branch is full, the electric energy is consumed through the brake resistor.

After the third branch 140 stores the electric energy to the upper limit, the excess electric energy in the main trunk 120 is consumed through the braking resistor 164.

Example 8:

as shown in fig. 11, the present embodiment provides a vehicle 200 including: a vehicle body 210 and a vehicle drive device 100 as in any of the embodiments of the invention; the vehicle drive device 100 is provided on a vehicle body 210.

Example 9:

as shown in fig. 12, the present embodiment provides a vehicle drive apparatus 300 including: a memory 310 and a processor 320, the memory 310 storing a computer program, the processor 320 executing the computer program; wherein the processor 320, when executing the computer program, performs the steps of the vehicle driving method according to any of the embodiments of the present invention.

Example 10:

the present embodiment provides a computer-readable storage medium storing a computer program that, when executed, implements the steps of the vehicle driving method of any of the above embodiments.

The specific embodiment is as follows:

the main purposes of this embodiment are: (1) the technical route is provided for solving the problem of high purchase and use cost of a high-power engine and a generator used by the electric wheel dump truck with the load of 100-363 tons. (2) Provides a technology for reducing the oil consumption of the electric wheel dump truck with the load of 100-ton and 363-ton.

In order to achieve the above object, the present embodiment provides a vehicle driving apparatus 100, which may adopt a plurality of low-power generator sets (2, 3, 4 … n sets) instead of the high-power engine and generator combination of the electric wheel dump truck, wherein the generator sets include an engine and a generator. Also, an energy control device (i.e., third branch 140) is provided. The device is used for collecting kinetic energy and potential energy of the whole vehicle during downhill slope and braking, redundant electric energy of a power module (namely the first branch circuit 110) is generated when the vehicle 200 is unloaded and waits, and all the collected energy is used for meeting the energy requirement when the vehicle 200 is heavily loaded.

In order to achieve the above object, the present embodiment provides a vehicle driving method, that is, a method for controlling multiple engines 112, in which multiple engines 112 are set to two operating states with the same rotation speed, that is, the high-power optimum economical rotation speed and the low-power fuel-saving rotation speed, respectively, according to the power required by the load of the vehicle 200.

For example, the vehicle driving device 100 of the present embodiment employs two or more small generator sets (i.e., the combination of the engine 112 and the generator 114) to replace the imported high-horsepower engine and the generator under the condition that the total power reaches the power required by the dump truck, so that the manufacturing cost of the dump truck is greatly reduced without reducing the performance of the dump truck. As shown in fig. 13, the first branch 110 includes a first generator set 166 and a first rectifying device 170, and the second first branch 110 includes a second generator set 168 and a second rectifying device 172, wherein the first generator set 166 and the second generator set 168 are respectively rectified by the first rectifying device 170(AC/DC converter) and the second rectifying device 172(AC/DC converter), respectively, so as to obtain a direct current, and then the direct current is combined to the grid (entering the main trunk 120), and each branch is provided with a control switch 150.

Referring to fig. 14, the main schematic diagram of the present embodiment shows that the electric energy of the first generator unit 174 passes through the first rectifier system 178 and then is subjected to dc grid connection, the electric energy of the second generator unit 176 passes through the second rectifier system 180 and then is subjected to dc grid connection, the electric energy after dc grid connection further controls the first driving motor 182 through the first inverter unit 184, and further controls the second driving motor 186 through the second inverter unit 188, and meanwhile, the main current path after grid connection is also connected to the braking resistor 192 through the chopper 190 and connected to the battery pack 196 through the charge/discharge machine 194.

Where G1 denotes a first generator group 174 in which an engine and a generator are combined, G2 denotes a second generator group 176 in which an engine and a generator are combined, RET1 denotes a first rectifying system 178, RET2 denotes a second rectifying system 180, VVVF1 denotes a first inverter unit 184, VVVF2 denotes a second inverter unit 188, TM1 denotes a first drive motor 182, TM2 denotes a second drive motor 186, CH denotes a chopper 190, BR denotes a brake resistor 192, BC denotes a charge/discharge machine 194, and BAT denotes a battery pack.

The basic method of the oil-electric hybrid electric wheel dump truck technology based on the multi-engine module is that the battery pack collects the redundant energy of the generator set when the vehicle 200 is in idle low power and the vehicle waits, and the electric energy generated when the vehicle 200 converts the driving motor into the generator for electric braking in the downhill process is collected and used for the working condition that the vehicle 200 is in a high power requirement for reloading, so that the fuel consumption of the engine 112 is reduced.

As shown in table 1, the smaller the output power is, the larger the BSFC (fuel consumption per unit engine) value is, and the worse the economic performance is, at a constant rotation speed of the engine 112. In the embodiment, a plurality of engine economic rotating speeds are selected, and the output power of the engine is improved as much as possible under the condition of the economic rotating speed. The engine 112 drives the generator 114 and the generated electrical energy is stored in a lithium battery pack for use when the vehicle 200 is heavily loaded.

TABLE 1 relationship between Engine speed and BSFC value

Rotational speed of engine	Engine power	BSFC value
			800rpm	≤30kW	300g/kWh
800rpm	100kW	205g/kWh
			1400rpm	≤50kW	300g/kWh
1400rpm	150kW	205g/kWh
			1400rpm	200kW	200g/kWh
1400rpm	220kW	195g/kWh
			1800rpm	500kW	200g/kWh
1800rpm	565kW	200g/kWh

The implementation steps of the oil-electric hybrid technology of the embodiment are described in the following through the specific conditions of each stage of the operation of the electric wheel dump truck:

(1) engine 112 idle battery 144 charging mode

As can be seen from the fuel consumption curve (BSFC) of the engine 112, when the load power is low (only the auxiliary power of the engine 112) at a certain rotation speed of the engine 112, the fuel consumption rate is high, which corresponds to low efficiency of the engine 112.

Charging battery 144 with DC/DC (third converter 142) increases the output of engine 112 to optimize the BSFC value of engine 112, which is equivalent to operating engine 112 in an optimal BSFC state, and the excess energy generated is temporarily stored in battery 144 and is consumed at the time of maximum power output of vehicle 200. Whether this mode saves energy or not, it is considered whether the stored energy versus fuel rate increase is economical in the battery 144 charging mode. The energy stored in the battery 144 and the fuel that is consumed in an increased amount are converted into the BSFC of the engine 112, and if the converted BSFC value is lower than the BSFC value corresponding to the full power of the engine 112, an energy saving effect is obtained.

(2) Dump truck taxi battery charging mode

When the dump truck slips with the accelerator pedal, the rotation speed of the engine 112 will be reduced from a high rotation speed to an idle speed, and because no traction force is output, the load power of the engine 112 is very low (only the auxiliary power of the engine), and the efficiency of the engine 112 is very low.

When the dump truck is coasting, the battery 144 is charged more, the output of the engine 112 is increased, and the engine 112 is operated in a state of high efficiency, and the same energy saving effect is obtained. This operating state corresponds to the parking idle mode, in which the battery 144 is charged.

(3) Vehicle 200 acceleration mode

In order to have better acceleration performance, a conventional electric wheel dump truck is generally designed with a low idle speed and a high idle speed, the low idle speed is adopted when the electric wheel dump truck is stopped at a middle gear, and when the gear is arranged forwards or backwards, the engine 112 is controlled to the high idle speed, so that larger power can be output immediately when the electric wheel dump truck is accelerated.

However, when the output power of the engine 112 is low at a high idle speed (generally 1300rpm or 1400rpm), the fuel economy of the engine 112 is poor. Therefore, in the traditional pure engine mode, the efficiency of the engine 112 is very low when the dump truck slides (the output power is less than 100kW) before accelerating, which is not beneficial to energy conservation.

In the hybrid drive mode, the rotation speed of the engine 112 is always controlled to a low value (800rpm) at the time of low power output, and the engine is always controlled in accordance with the rotation speed corresponding to the optimum power output mode at the time of acceleration, so that the acceleration performance of the vehicle 200 can be ensured by replenishing power with the battery 144 although the rotation speed of the engine 112 is slowly increased.

In the control mode of hybrid driving without high idle speed, the engine 112 can be ensured to work in an economic region all the time, and the energy-saving effect is achieved.

(4) Downhill electric braking mode

When the dump truck is descending a slope, electric braking is applied to control the vehicle speed, and at this time, the battery 144 is charged by the DC/DC (third converter 142) preferentially to absorb and store the feedback energy, and the remaining energy is consumed by the braking resistor.

According to the three-level open-pit mine road in the GBJ22 factory mine road design specification, the corresponding distances of different slopes, the no-load downhill time of the 150-ton-level electric wheel dump truck and the electric energy stored in the battery 144 are shown in table 2.

Table 2 downhill storage of electrical energy

The actual power control method of the hybrid system for the generator 114 is as follows:

in order to ensure that the engine 112 has a favorable BSFC, the electric drive system control is performed such that the engine 112 is always operated in a high efficiency state by controlling the corresponding rotational speed of the engine 112 in accordance with the depth of the foot pedal as a predetermined system power. When no tractive power is required for parking, coasting, electric braking, etc., the engine is always controlled at 800rpm and the battery 144 is charged at a constant power.

During the vehicle uphill or dynamic acceleration, the engine 112 is always controlled in an economic range of 1400rpm-1800rpm, and when the depth of the accelerator pedal is not matched with the rotation speed of the engine 112, the battery 144 can be adopted to supplement power to meet the traction power requirement, as shown in fig. 15. In fig. 15, the abscissa indicates the engine speed, the ordinate indicates the engine output torque, the solid line indicates the fuel consumption value, and the broken line indicates the power value.

The embodiment effectively solves the problems of purchase and overhigh cost price of the imported high-horsepower engine of the mining electric wheel dump truck, and greatly reduces the manufacturing cost and the selling price of the similar mining electric wheel dump truck.

The proportion of fuel consumption to the total use cost is usually more than 45% when a surface mine user uses the mining electric wheel dump truck, the embodiment can reduce the fuel consumption by more than 10%, and the mining electric wheel dump truck has great economic benefit.

In summary, the embodiment of the invention has the following beneficial effects:

1. by using multiple engines 112 in combination with multiple generators 114 instead of high power engines and generators, the manufacturing and maintenance costs of the vehicle 200 are reduced and the performance of the vehicle 200 is not reduced.

2. By arranging the third branch 140, the electric energy from the main line 120 is stored or the electric energy is released to the main line 120, so that the fuel consumption of the engine is reduced to a great extent, and the purpose of improving the fuel utilization rate is achieved.

In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or unit must have a specific direction, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A vehicle drive device (100), characterized by comprising:

at least one first branch (110), the first branch (110) comprising an engine (112), a generator (114) and a first converter (116);

a trunk (120);

at least one second branch (130);

a third branch (140);

wherein the engine (112) drives the generator (114) to output alternating current, the first converter (116) converts the alternating current into direct current and outputs the direct current to the main circuit (120), the main circuit (120) is communicated with the first branch circuit (110), the second branch circuit (130) and the third branch circuit (140), the second branch circuit (130) converts the direct current of the main circuit (120) into alternating current for driving a vehicle, and the third branch circuit (140) stores electric energy from the main circuit (120) or releases electric energy to the main circuit (120).

2. The vehicle drive device (100) according to claim 1, wherein the second branch (130) includes:

a drive motor (132);

a second converter (134);

wherein the second converter (134) converts the direct current of the main circuit (120) into alternating current and outputs the alternating current to the drive motor (132).

3. The vehicle drive apparatus (100) according to claim 1, wherein the third branch (140) includes:

a third converter (142);

a battery (144);

wherein the third converter (142) converts the direct current of the main circuit (120) into a direct current suitable for the battery (144), the battery (144) storing electrical energy; or the battery (144) discharges electric energy, which is output to the trunk circuit (120) through the third converter (142).

4. The vehicle drive device (100) according to claim 1, wherein the first branch (110) further includes, based on the first branch (110) being plural:

the control switch (150) is arranged on the first branch circuit (110) and used for controlling the first branch circuit (110) to be connected or disconnected with the main circuit (120).

5. The vehicle drive device (100) according to any one of claims 1 to 4, characterized by further comprising:

a fourth branch (160), the fourth branch (160) comprising a fourth converter (162) and a brake resistor (164), the fourth converter (162) converting the direct current of the main line (120) into a direct current suitable for the brake resistor (164) and outputting to the brake resistor (164).

6. A vehicle driving method for a vehicle driving apparatus (100) according to any one of claims 1 to 5, characterized by comprising:

controlling the rotating speed of the engine to be a first rotating speed based on the depth of the accelerator pedal of the vehicle being less than or equal to a depth threshold value, driving the vehicle through the second branch, and controlling the third branch to store electric energy through the main road when the power of the engine is greater than the traction power demand of the vehicle;

and controlling the rotating speed of the engine to be a second rotating speed based on the fact that the depth of the accelerator pedal of the vehicle is larger than the depth threshold value, driving the vehicle through the second branch, and controlling the third branch to release electric energy to the main road when the power of the engine is smaller than the traction power requirement of the vehicle, so that the sum of the power of the engine and the electric energy released by the third branch meets the traction power requirement of the vehicle.

7. The vehicle driving method according to claim 6, characterized by further comprising:

and after the electric energy stored in the third branch is full, the electric energy is consumed through the brake resistor.

8. A vehicle (200), characterized by comprising:

a vehicle body (210);

the vehicle drive device (100) according to any one of claims 1 to 4;

wherein the vehicle drive device (100) is provided on the vehicle body (210).

9. A vehicle drive apparatus (300), characterized by comprising:

a memory (310) storing a computer program;

a processor (320) executing the computer program;

wherein the processor (320), when executing the computer program, carries out the steps of the vehicle driving method according to claim 6 or 7.

10. A computer-readable storage medium, comprising:

the computer-readable storage medium stores a computer program which, when executed, implements the steps of the vehicle driving method according to claim 6 or 7.