Energy-saving control device and control method for electric wheel dumper

Abstract

The invention discloses an energy-saving control device for an electric wheel dumper, and relates to the field of energy conservation, the energy-saving control device for the electric wheel dumper comprises a left motor and a right motor which are used for rotating to drive the electric wheel dumper to run in a traction mode; in the electric braking mode, a generator generates three-phase alternating current and outputs the three-phase alternating current to the energy processing module; the electric wheel dump truck has the beneficial effects that through the arrangement of the energy processing module, when the electric wheel dump truck is in an electric braking mode, the left motor and the right motor are changed into generators to generate electric energy, the energy processing module receives and processes the electric energy, and the designed energy storage and consumption unit preferentially stores energy; energy recycling and reusing are achieved, and energy conservation and carbon emission reduction of the vehicle are facilitated; under the condition that the energy storage is full, the input energy is consumed, and the situation that the input electric energy is not consumed or stored in time, so that the voltage is increased, and equipment is damaged is avoided.

Description

Technical Field

[0001] The present invention relates to the field of energy conservation, and in particular to an energy conservation control device and a control method for an electric wheel dump truck. Background Art

[0002] Electric wheel dump trucks are a widely used type of mining machinery with the characteristics of large load capacity, long service life, and large market share. Electric wheel dump trucks on the market generally adopt an electric transmission solution powered by a diesel engine. The basic working principle of this solution is that the diesel engine drives the generator to generate electricity, and controls the DC motor or AC motor through a contactor or inverter to drive the vehicle.

[0003] To reduce damage to the brake disc, the traction motor of an electric wheel dump truck switches to power generation mode when decelerating and braking, converting the braking energy into electrical energy. The vehicle is braked through the reaction torque generated by the motor. The electrical energy generated during braking is consumed by the brake resistor box, which is then released into the air in the form of heat energy. According to calculations, taking an AC drive electric wheel dump truck MT5500 with a load capacity of 326 tons as an example, when the dump truck brakes empty downhill, its electric braking power can reach more than 3000kw.

[0004] Since mine roads require frequent uphill and downhill movements, electric wheel dump trucks need to frequently use electric brakes, resulting in a huge waste of energy and requiring improvement. Summary of the Invention

[0005] The object of the present invention is to provide an energy-saving control device and control method for an electric wheel dump truck to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] An energy-saving control device for an electric wheel dump truck, comprising:

[0008] Diesel engine, used to drive the main generator;

[0009] Main generator, used to generate AC power during operation;

[0010] Rectifier bridge, used to convert AC power into DC power;

[0011] The inverter is used to convert DC power into AC power of the required size to power the left and right inverters;

[0012] The left inverter is used to drive the left motor to rotate during operation;

[0013] The right inverter is used to drive the right motor to rotate during operation;

[0014] Vehicle controller, used to control the operation of the left traction controller and the right traction controller;

[0015] Left traction controller, used to control the working state of the left inverter;

[0016] Right traction controller, used to control the working state of the right inverter;

[0017] The left motor and the right motor are used in traction mode to rotate and drive the electric wheel dump truck; in electric braking mode, they act as generators to generate three-phase AC power and output it to the energy processing module;

[0018] an energy processing module, configured to store or consume three-phase AC power and use the stored voltage as (part of) the supply voltage in traction mode;

[0019] The output end of the oil production machine is connected to the input end of the main generator, the output end of the main generator is connected to the input end of the rectifier bridge, the output end of the rectifier bridge is connected to the input end of the inverter, the output end of the inverter is connected to the first input end of the left frequency converter and the first input end of the right frequency converter, the output end of the vehicle controller is connected to the input end of the left traction controller and the input end of the right traction controller, the output end of the left traction controller is connected to the second input end of the left frequency converter, the output end of the right traction controller is connected to the second input end of the right frequency converter, the output end of the left frequency converter is connected to the input end of the left motor, the output end of the right frequency converter is connected to the input end of the right motor, the output end of the left motor is connected to the input end of the energy processing module, the output end of the right motor is connected to the input end of the energy processing module, and the output end of the energy processing module is connected to the input end of the inverter;

[0020] The energy processing module includes:

[0021] A voltage processing unit, used to convert the input three-phase alternating current into direct current to supply the energy storage and consumption unit;

[0022] The energy storage and consumption unit is used to store the input DC power in the battery when the battery is not fully charged, and consume the input DC power when the battery is fully charged;

[0023] A fault warning unit is used to issue an alarm when the DC power generated by the voltage processing unit accumulates;

[0024] The output end of the voltage processing unit is connected to the input end of the energy storage and consumption unit and the first input end of the fault warning unit, and the output end of the energy storage and consumption unit is connected to the second input end of the fault warning unit.

[0025] As a further solution of the present invention: the voltage processing unit includes a three-phase rectifier bridge, a first capacitor, a first inductor, a second capacitor, and a first resistor. The input end of the three-phase rectifier bridge introduces the three-phase alternating current generated by the left motor and the right motor. The output end of the three-phase rectifier bridge is connected to one end of the first capacitor and one end of the first inductor, and the other end of the first capacitor is grounded. The other end of the first inductor is connected to one end of the second capacitor and one end of the first resistor. The other end of the second capacitor is grounded, and the other end of the first resistor is connected to the input end of the energy storage and consumption unit and the first input end of the fault warning unit.

[0026] As a further solution of the present invention: the energy storage and consumption unit includes:

[0027] The energy storage subunit is used to store electrical energy in the battery or output direct current from the battery; when the battery is not fully charged, the power supply circuit of the voltage processing unit and the energy storage subunit is connected, and the power supply circuit of the voltage processing unit and the energy consumption subunit is disconnected; when the battery is fully charged, the power supply circuit of the voltage processing unit and the energy storage subunit is disconnected, and the power supply circuit of the voltage processing unit and the energy consumption subunit is connected;

[0028] An energy consumption subunit, used to consume the input voltage and current through a resistor;

[0029] The input end of the energy storage subunit is connected to the first input end of the energy consumption subunit and the output end of the voltage processing unit, the first output end of the energy storage subunit is connected to the second input end of the fault warning unit, and the second output end of the energy storage subunit is connected to the second input end of the energy consumption subunit.

[0030] As a further solution of the present invention: the energy storage subunit includes a fifth resistor, a sixth resistor, a controllable precision voltage-stabilizing source (model may be TL431, TL432, KA431, LM431, S431, etc.), a first diode, a second diode, a first transistor, a second transistor, a third transistor, a seventh resistor, a battery, a fourth diode, a third diode, an eighth resistor, a ninth resistor, a third capacitor, and a fourth capacitor. One end of the fifth resistor is connected to one end of the sixth resistor, the positive electrode of the first diode, and the output end of the voltage processing unit. The other end of the fifth resistor is connected to the first end of the controllable precision voltage-stabilizing source and the base of the third transistor. The second end of the controllable precision voltage-stabilizing source is grounded. The third end of the controllable precision voltage-stabilizing source is connected to the positive electrode of the fourth diode and the second input end of the fault warning unit. The input end, the cathode of the first diode is connected to the emitter of the first transistor, the base of the first transistor is connected to the other end of the sixth resistor and the emitter of the second transistor, the collector of the first transistor is connected to the base of the second transistor and one end of the seventh resistor, the other end of the seventh resistor is connected to the collector of the third transistor, the emitter of the third transistor is grounded, the collector of the second transistor is connected to the anode of the second diode, the cathode of the second diode is connected to the positive electrode of the battery, one end of the eighth resistor, and the anode of the third diode, the negative electrode of the battery is grounded, the cathode of the third diode is connected to one end of the fourth capacitor, the other end of the fourth capacitor is grounded, the other end of the eighth resistor is connected to one end of the ninth resistor, the cathode of the fourth diode, and one end of the third capacitor, the other end of the ninth resistor is grounded, and the other end of the third capacitor is grounded.

[0031] As a further solution of the present invention: the energy consumption sub-unit includes a fourth MOS tube and a fourth resistor, the D pole of the fourth MOS tube is connected to the output end of the voltage processing unit, the G pole of the fourth MOS tube is connected to the base of the second transistor, the S pole of the fourth MOS tube is connected to one end of the fourth resistor, and the other end of the fourth resistor is grounded.

[0032] As a further solution of the present invention: the fault warning unit includes:

[0033] The voltage accumulation judgment subunit is used to detect whether the DC power generated by the voltage processing unit has accumulated beyond a threshold value. If the threshold value is exceeded, an alarm is issued and power is supplied to the battery fault detection subunit.

[0034] The battery fault detection subunit is used to illuminate and indicate when the battery is fully charged after being powered on.

[0035] The input end of the voltage accumulation judgment subunit is connected to the output end of the voltage processing unit, the output end of the voltage accumulation judgment subunit is connected to the first input end of the battery fault detection subunit, and the second input end of the battery fault detection subunit is connected to the output end of the energy storage consumption unit.

[0036] As a further solution of the present invention: the voltage accumulation judgment subunit includes a second resistor, a third resistor, a first amplifier, a fifth diode, and a speaker, one end of the second resistor is connected to the output end of the voltage processing unit, the other end of the second resistor is connected to one end of the third resistor and the non-inverting end of the first amplifier, the other end of the third resistor is grounded, the inverting end of the first amplifier is connected to a reference voltage, the output end of the first amplifier is connected to one end of the speaker and the first input end of the battery fault detection subunit, the other end of the speaker is connected to the positive electrode of the fifth diode, and the negative electrode of the fifth diode is grounded.

[0037] As a further solution of the present invention: the battery fault detection subunit includes a second amplifier, a tenth resistor, and a sixth diode. The power supply end of the second amplifier is connected to the output end of the voltage accumulation judgment subunit, the non-inverting end of the second amplifier is connected to the output end of the energy storage consumption unit, the inverting end of the second amplifier is connected to the reference voltage, the output end of the second amplifier is connected to one end of the tenth resistor, the other end of the tenth resistor is connected to the positive electrode of the sixth diode, and the negative electrode of the sixth diode is grounded.

[0038] An energy-saving control method for an electric wheel dump truck is applied to the energy-saving control device for an electric wheel dump truck as described above. The energy-saving control method for an electric wheel dump truck comprises the following steps:

[0039] Step 1: The diesel engine drives the main generator to generate electricity. The main generator outputs three-phase AC power, which is converted into DC power after passing through the rectifier bridge. The DC power is then converted into AC power through the inverter and output to the frequency converter.

[0040] Step 2: When the electric wheel dump truck is in traction mode, the vehicle controller controls the inverter (left inverter, right inverter) through the traction controller (left traction controller, right traction controller) to drive the motor (left motor, right motor) to rotate and drive the vehicle;

[0041] Step 3: When the electric wheel dump truck is in electric braking mode, the motor becomes a generator to generate three-phase AC power, which is input into the energy processing module for storage or consumption;

[0042] Step 4: When the electric wheel dump truck is in traction mode again, the energy processing module outputs DC power which is converted into AC power through the inverter to power the frequency converter.

[0043] Compared with the prior art, the beneficial effects of the present invention are as follows: by setting an energy processing module, when the electric wheel dump truck is in electric braking mode, the left and right motors become generators to generate electrical energy, the energy processing module receives and processes the electrical energy, and the designed energy storage and consumption unit prioritizes energy storage to achieve energy recovery and reuse, which helps the vehicle to achieve energy saving and reduce carbon emissions; when the energy storage is full, the input energy is consumed to avoid the input electrical energy not being consumed or stored in time, resulting in voltage rise and equipment damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 The schematic diagram of an energy-saving control device for an electric wheel dump truck is shown.

[0045] Figure 2 This is the schematic diagram of the energy processing module.

[0046] Figure 3 This is a circuit diagram of the voltage processing unit, energy storage and consumption unit, and fault warning unit. DETAILED DESCRIPTION

[0047] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0048] See also Figure 1 and Figure 2 , an energy-saving control device for an electric wheel dump truck, comprising:

[0049] Diesel engine, used to drive the main generator;

[0050] Main generator, used to generate AC power during operation;

[0051] Rectifier bridge, used to convert AC power into DC power;

[0052] The inverter is used to convert DC power into AC power of the required size to power the left and right inverters;

[0053] The left inverter is used to drive the left motor to rotate during operation;

[0054] The right inverter is used to drive the right motor to rotate during operation;

[0055] Vehicle controller, used to control the operation of the left traction controller and the right traction controller;

[0056] Left traction controller, used to control the working state of the left inverter;

[0057] Right traction controller, used to control the working state of the right inverter;

[0058] The left motor and the right motor are used in traction mode to rotate and drive the electric wheel dump truck; in electric braking mode, they act as generators to generate three-phase AC power and output it to the energy processing module;

[0059] an energy processing module, configured to store or consume three-phase AC power and use the stored voltage as (part of) the supply voltage in traction mode;

[0060] The output end of the diesel engine is connected to the input end of the main generator, the output end of the main generator is connected to the input end of the rectifier bridge, the output end of the rectifier bridge is connected to the input end of the inverter, the output end of the inverter is connected to the first input end of the left inverter and the first input end of the right inverter, the output end of the vehicle controller is connected to the input end of the left traction controller and the input end of the right traction controller, the output end of the left traction controller is connected to the second input end of the left inverter, the output end of the right traction controller is connected to the second input end of the right inverter, the output end of the left inverter is connected to the input end of the left motor, the output end of the right inverter is connected to the input end of the right motor, the output end of the left motor is connected to the input end of the energy processing module, the output end of the right motor is connected to the input end of the energy processing module, and the output end of the energy processing module is connected to the input end of the inverter;

[0061] The energy processing module includes:

[0062] The voltage processing unit 1 is used to convert the input three-phase AC power into DC power and supply it to the energy storage and consumption unit 2;

[0063] The energy storage and consumption unit 2 is used to store the input DC power into the battery E1 when the battery E1 is not fully charged; and consume the input DC power when the battery E1 is fully charged;

[0064] A fault warning unit 3 is used to issue an alarm when the DC power generated by the voltage processing unit 1 accumulates;

[0065] The output end of the voltage processing unit 1 is connected to the input end of the energy storage and consumption unit 2 and the first input end of the fault warning unit 3 , and the output end of the energy storage and consumption unit 2 is connected to the second input end of the fault warning unit 3 .

[0066] In this example: See Figure 3The voltage processing unit 1 includes a three-phase rectifier bridge, a first capacitor C1, a first inductor L1, a second capacitor C2, and a first resistor R1. The input end of the three-phase rectifier bridge introduces the three-phase alternating current generated by the left motor and the right motor. The output end of the three-phase rectifier bridge is connected to one end of the first capacitor C1 and one end of the first inductor L1. The other end of the first capacitor C1 is grounded. The other end of the first inductor L1 is connected to one end of the second capacitor C2 and one end of the first resistor R1. The other end of the second capacitor C2 is grounded. The other end of the first resistor R1 is connected to the input end of the energy storage and consumption unit 2 and the first input end of the fault warning unit 3.

[0067] After the three-phase AC power is input, it is converted into DC power through the three-phase rectifier bridge, and then filtered through the first capacitor C1, the second capacitor C2, and the first inductor L1 to become a stable DC power, which is output to the subsequent circuit after passing through the first resistor R1.

[0068] In another embodiment, the first resistor R1 can be omitted. The first resistor R1 is used to limit the current to prevent the circuit from being damaged by excessive current.

[0069] In this example: See Figure 3 , the energy storage consumption unit 2 includes:

[0070] The energy storage subunit is used for storing electrical energy in the battery E1 or outputting direct current from the battery E1; when the battery E1 is not fully charged, the power supply circuit between the voltage processing unit 1 and the energy storage subunit is connected, and the power supply circuit between the voltage processing unit 1 and the energy consumption subunit is disconnected; when the battery E1 is fully charged, the power supply circuit between the voltage processing unit 1 and the energy storage subunit is disconnected, and the power supply circuit between the voltage processing unit 1 and the energy consumption subunit is connected;

[0071] An energy consumption subunit, used to consume the input voltage and current through a resistor;

[0072] The input end of the energy storage subunit is connected to the first input end of the energy consumption subunit and the output end of the voltage processing unit 1, the first output end of the energy storage subunit is connected to the second input end of the fault warning unit 3, and the second output end of the energy storage subunit is connected to the second input end of the energy consumption subunit.

[0073] In this example: See Figure 3The energy storage subunit includes a fifth resistor R5, a sixth resistor R6, a controllable precision voltage regulator Z1 (model may be TL431, TL432, KA431, LM431, S431, etc.), a first diode D1, a second diode D2, a first transistor V1, a second transistor V2, a third transistor V3, a seventh resistor R7, a battery E1, a fourth diode D4, a third diode D3, an eighth resistor R8, a ninth resistor R9, a third capacitor C3, and a fourth capacitor C4. One end of the fifth resistor R5 is connected to one end of the sixth resistor R6, the anode of the first diode D1, and the output end of the voltage processing unit 1. The other end of the fifth resistor R5 is connected to the first end of the controllable precision voltage regulator Z1 and the base of the third transistor V3. The second end of the controllable precision voltage regulator Z1 is grounded. The third end of the controllable precision voltage regulator Z1 is connected to the anode of the fourth diode D4 and the second input end of the fault warning unit 3. The first diode D4 is connected to the positive electrode of the fourth diode D4 and the second input end of the fault warning unit 3. The cathode of the transistor D1 is connected to the emitter of the first transistor V1, the base of the first transistor V1 is connected to the other end of the sixth resistor R6 and the emitter of the second transistor V2, the collector of the first transistor V1 is connected to the base of the second transistor V2 and one end of the seventh resistor R7, the other end of the seventh resistor R7 is connected to the collector of the third transistor V3, the emitter of the third transistor V3 is grounded, the collector of the second transistor V2 is connected to the anode of the second diode D2, the cathode of the second diode D2 is connected to the positive electrode of the battery E1, one end of the eighth resistor R8, and the positive electrode of the third diode D3, the negative electrode of the battery E1 is grounded, the cathode of the third diode D3 is connected to one end of the fourth capacitor C4, the other end of the fourth capacitor C4 is grounded, the other end of the eighth resistor R8 is connected to one end of the ninth resistor R9, the cathode of the fourth diode D4, and one end of the third capacitor C3, the other end of the ninth resistor R9 is grounded, and the other end of the third capacitor C3 is grounded.

[0074] When battery E1 is charging, after voltage is input, the base of the third transistor V3 reaches a high level, the third transistor V3 is turned on, pulling down the base voltage of the second transistor V2, causing the second transistor V2 to turn on. Current flows through the sixth resistor R6, the second transistor V2, and the second diode D2 to charge battery E1. The voltage across battery E1 is the sum of the voltages across the eighth resistor R8 and the ninth resistor R9. As the voltage of battery E1 rises, the voltage across the ninth resistor R9 rises. When it reaches a level sufficient to turn on the fourth diode D4, a voltage signal is fed back to the third terminal of the controllable precision voltage regulator Z1, causing the voltage at the first terminal of the controllable precision voltage regulator Z1 to decrease. This reduces the base voltage of the third transistor V3, turning off the third transistor V3. This generates a high level at the base of the second transistor V2 through the first diode D1 and the first transistor V1. The second transistor V2 is turned off, and charging of battery E1 stops.

[0075] When the battery E1 is discharged, the voltage on the battery E1 is output through the third diode D3 and the fourth capacitor C4, and is converted into AC power after passing through the inverter to power the frequency converter.

[0076] In another embodiment, the fourth capacitor C4 can be omitted. The fourth capacitor C4 is used to stabilize the voltage output to the inverter.

[0077] In this example: See Figure 3 The energy consumption sub-unit includes a fourth MOS transistor V4 and a fourth resistor R4. The D electrode of the fourth MOS transistor V4 is connected to the output end of the voltage processing unit 1, the G electrode of the fourth MOS transistor V4 is connected to the base of the second transistor V2, the S electrode of the fourth MOS transistor V4 is connected to one end of the fourth resistor R4, and the other end of the fourth resistor R4 is grounded.

[0078] Considering the long downhill sections where the electric wheel dump truck is in electric braking mode for a long time, if there is no energy consumption sub-unit, after battery E1 is fully charged, battery E1 will no longer charge, causing voltage accumulation at the output end of voltage processing unit 1. When the voltage exceeds the rated voltage of the device, the device may be damaged due to excessive voltage. Therefore, the energy consumption sub-unit is designed. The energy consumption sub-unit is cut off when battery E1 is charging. When battery E1 is charging, common point A is at a low level, and the fourth MOS transistor V4 is cut off. Only when battery E1 is fully charged, common point A becomes a high level, and the fourth MOS transistor V4 is turned on. The voltage output by voltage processing unit 1 is consumed by fourth resistor R4. The resistance of fourth resistor R4 is relatively large to ensure that the voltage can be completely consumed.

[0079] In another embodiment, the fourth resistor R4 with a larger resistance may be replaced by multiple resistors connected in series.

[0080] In this example: See Figure 3 , the fault warning unit 3 includes:

[0081] The voltage accumulation judgment subunit is used to detect whether the DC power generated by the voltage processing unit 1 exceeds the threshold. If the threshold is exceeded, an alarm is issued and power is supplied to the battery E1 fault detection subunit.

[0082] Battery E1 fault detection subunit, used to illuminate and indicate when battery E1 is fully charged after being powered on;

[0083] The input end of the voltage accumulation judgment subunit is connected to the output end of the voltage processing unit 1, the output end of the voltage accumulation judgment subunit is connected to the first input end of the battery E1 fault detection subunit, and the second input end of the battery E1 fault detection subunit is connected to the output end of the energy storage consumption unit 2.

[0084] In this example: See Figure 3The voltage accumulation judgment subunit includes a second resistor R2, a third resistor R3, a first amplifier U1, a fifth diode D5, and a speaker SPEAKER. One end of the second resistor R2 is connected to the output end of the voltage processing unit 1, the other end of the second resistor R2 is connected to one end of the third resistor R3 and the non-inverting end of the first amplifier U1, the other end of the third resistor R3 is grounded, the inverting end of the first amplifier U1 is connected to the reference voltage VREF, the output end of the first amplifier U1 is connected to one end of the speaker SPEAKER and the first input end of the battery E1 fault detection subunit, the other end of the speaker SPEAKER is connected to the anode of the fifth diode D5, and the cathode of the fifth diode D5 is grounded.

[0085] Taking into account the possibility of failure of the energy storage subunit and the energy consumption subunit, when the accumulated voltage at the output end of the voltage processing unit 1 reaches a threshold value, the voltage on the third resistor R3 is higher than the reference voltage VREF, the first amplifier U1 outputs a high level, drives the buzzer to sound an alarm, and the fifth diode D5 lights up to alert the driver of the abnormality.

[0086] In another embodiment, the reference voltage VREF is obtained through a voltage regulator or a voltage regulator diode.

[0087] In this example: See Figure 3 The battery E1 fault detection subunit includes a second amplifier U2, a tenth resistor R10, and a sixth diode D6. The power supply end of the second amplifier U2 is connected to the output end of the voltage accumulation judgment subunit, the non-inverting end of the second amplifier U2 is connected to the output end of the energy storage consumption unit 2, the inverting end of the second amplifier U2 is connected to the reference voltage VREF, the output end of the second amplifier U2 is connected to one end of the tenth resistor R10, the other end of the tenth resistor R10 is connected to the anode of the sixth diode D6, and the cathode of the sixth diode D6 is grounded.

[0088] The first amplifier U1 outputs a high level to the power supply terminal of the second amplifier U2 (the power supply terminal of the first amplifier U1 is continuously powered and is omitted and not shown), and the second amplifier U2 starts to work. When the battery E1 is fully charged, the voltage at the non-inverting terminal of the second amplifier U2 is also higher than the reference voltage VREF at the inverting terminal, and the second amplifier U2 outputs a high level, which is indicated by the sixth diode D6 lighting up.

[0089] First, when the buzzer alarms and the fifth diode D5 lights up, it can be determined that at least one of the energy storage subunit and the energy consumption subunit is faulty. If the energy storage subunit is operating normally, the charging circuit is disconnected only after the battery E1 is fully charged. At this time, the sixth diode D6 lights up normally, and it is determined that the output voltage of the voltage processing unit 1 is cumulatively boosted to the point where the energy consumption subunit fails to consume the voltage in time. If the energy storage subunit is abnormal, causing the charging circuit to be disconnected before the battery E1 is fully charged, the sixth diode D6 does not light up, and it can be determined that the energy storage subunit is abnormal. In this case, it is necessary to further determine whether the energy storage subunit is faulty. The fourth MOS tube V4 can be manually powered on to turn on the fourth resistor R4 to determine whether it consumes energy.

[0090] In another embodiment, the resistance values ​​of the second resistor R2 and the third resistor R3 are strictly selected so that the two reference voltages VREF are consistent. Alternatively, the resistance values ​​of the second resistor R2 and the third resistor R3 may be loosely selected, in which case the reference voltages VREF at the inverting terminals of the first amplifier U1 and the second amplifier U2 are inconsistent.

[0091] An energy-saving control method for an electric wheel dump truck is applied to the energy-saving control device for an electric wheel dump truck as described above. The energy-saving control method for an electric wheel dump truck comprises the following steps:

[0092] Step 1: The diesel engine drives the main generator to generate electricity. The main generator outputs three-phase AC power, which is converted into DC power after passing through the rectifier bridge. The DC power is then converted into AC power through the inverter and output to the frequency converter.

[0093] Step 2: When the electric wheel dump truck is in traction mode, the vehicle controller controls the inverter (left inverter, right inverter) through the traction controller (left traction controller, right traction controller) to drive the motor (left motor, right motor) to rotate and drive the vehicle;

[0094] Step 3: When the electric wheel dump truck is in electric braking mode, the motor becomes a generator to generate three-phase AC power, which is input into the energy processing module for storage or consumption;

[0095] Step 4: When the electric wheel dump truck is in traction mode again, the energy processing module outputs DC power which is converted into AC power through the inverter to power the frequency converter.

[0096] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as exemplary and non-restrictive.

[0097] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. An energy-saving control device for an electric wheel dump truck, comprising: Diesel engine, used to drive the main generator; The main generator is used to generate AC power during operation; Rectifier bridge, used to convert AC into DC; The inverter is used to convert direct current into alternating current of required size to supply power to the left and right inverters; The left inverter is used to drive the left motor to rotate during operation; The right inverter is used to drive the right motor to rotate during operation; The vehicle controller is used to control the operation of the left traction controller and the right traction controller; The left traction controller is used to control the working state of the left inverter; Right traction controller, used to control the working state of the right inverter; Characterized in that the energy-saving control device for the electric wheel dump truck also includes: The left motor and the right motor are used in the traction mode to rotate and drive the electric wheel dump truck to travel; in the electric braking mode, they act as generators to generate three-phase AC power and output it to the energy processing module; An energy processing module, used for storing or consuming three-phase alternating current and using the stored voltage as a supply voltage in traction mode; The output end of the diesel engine is connected to the input end of the main generator, the output end of the main generator is connected to the input end of the rectifier bridge, the output end of the rectifier bridge is connected to the input end of the inverter, the output end of the inverter is connected to the first input end of the left inverter and the first input end of the right inverter, the output end of the vehicle controller is connected to the input end of the left traction controller and the input end of the right traction controller, the output end of the left traction controller is connected to the second input end of the left inverter, the output end of the right traction controller is connected to the second input end of the right inverter, the output end of the left inverter is connected to the input end of the left motor, the output end of the right inverter is connected to the input end of the right motor, the output end of the left motor is connected to the input end of the energy processing module, the output end of the right motor is connected to the input end of the energy processing module, and the output end of the energy processing module is connected to the input end of the inverter; The energy processing module includes: A voltage processing unit, used to convert the input three-phase alternating current into direct current to supply the energy storage and consumption unit; The energy storage and consumption unit is used to store the input direct current into the battery when the battery is not fully charged, and consume the input direct current when the battery is fully charged; A fault warning unit, used to give an alarm when the DC power generated by the voltage processing unit accumulates; The output end of the voltage processing unit is connected to the input end of the energy storage and consumption unit and the first input end of the fault warning unit, and the output end of the energy storage and consumption unit is connected to the second input end of the fault warning unit.

2. The energy-saving control device for an electric wheel dump truck according to claim 1, characterized in that: The voltage processing unit includes a three-phase rectifier bridge, a first capacitor, a first inductor, a second capacitor, and a first resistor. The input end of the three-phase rectifier bridge introduces the three-phase alternating current generated by the left motor and the right motor. The output end of the three-phase rectifier bridge is connected to one end of the first capacitor and one end of the first inductor, and the other end of the first capacitor is grounded. The other end of the first inductor is connected to one end of the second capacitor and one end of the first resistor, and the other end of the second capacitor is grounded. The other end of the first resistor is connected to the input end of the energy storage consumption unit and the first input end of the fault warning unit.

3. The energy-saving control device for an electric wheel dump truck according to claim 1, characterized in that: Energy storage and consumption units include: The energy storage subunit is used for storing electric energy in the battery or outputting direct current from the battery; when the battery is not fully charged, the power supply circuits of the voltage processing unit and the energy storage subunit are turned on, and the power supply circuits of the voltage processing unit and the energy consumption subunit are turned off; when the battery is fully charged, the power supply circuits of the voltage processing unit and the energy storage subunit are turned on, and the power supply circuits of the voltage processing unit and the energy consumption subunit are turned on; An energy consumption subunit, used to consume the input voltage and current through a resistor; The input end of the energy storage subunit is connected to the first input end of the energy consumption subunit and the output end of the voltage processing unit, the first output end of the energy storage subunit is connected to the second input end of the fault warning unit, and the second output end of the energy storage subunit is connected to the second input end of the energy consumption subunit.

4. The energy-saving control device for an electric wheel dump truck according to claim 3, characterized in that: The energy storage subunit includes a fifth resistor, a sixth resistor, a controllable precision voltage-stabilizing source, a first diode, a second diode, a first transistor, a second transistor, a third transistor, a seventh resistor, a battery, a fourth diode, a third diode, an eighth resistor, a ninth resistor, a third capacitor, and a fourth capacitor. One end of the fifth resistor is connected to one end of the sixth resistor, the positive electrode of the first diode, and the output end of the voltage processing unit. The other end of the fifth resistor is connected to the first end of the controllable precision voltage-stabilizing source and the base of the third transistor. The second end of the controllable precision voltage-stabilizing source is grounded. The third end of the controllable precision voltage-stabilizing source is connected to the positive electrode of the fourth diode and the second input end of the fault warning unit. The cathode of the first diode is connected to the emitter of the first transistor. The base of the first transistor is connected to the other end of the sixth resistor and the emitter of the second transistor, the collector of the first transistor is connected to the base of the second transistor and one end of the seventh resistor, the other end of the seventh resistor is connected to the collector of the third transistor, the emitter of the third transistor is grounded, the collector of the second transistor is connected to the anode of the second diode, the cathode of the second diode is connected to the anode of the battery, one end of the eighth resistor, and the anode of the third diode, the cathode of the battery is grounded, the cathode of the third diode is connected to one end of the fourth capacitor, the other end of the fourth capacitor is grounded, the other end of the eighth resistor is connected to one end of the ninth resistor, the cathode of the fourth diode, and one end of the third capacitor, the other end of the ninth resistor is grounded, and the other end of the third capacitor is grounded.

5. The energy-saving control device for an electric wheel dump truck according to claim 4, characterized in that: The energy consumption sub-unit includes a fourth MOS tube and a fourth resistor. The D pole of the fourth MOS tube is connected to the output end of the voltage processing unit, the G pole of the fourth MOS tube is connected to the base of the second transistor, the S pole of the fourth MOS tube is connected to one end of the fourth resistor, and the other end of the fourth resistor is grounded.

6. The energy-saving control device for an electric wheel dump truck according to claim 1, characterized in that: The fault warning unit includes: A voltage accumulation judgment subunit is used to detect whether the DC power generated by the voltage processing unit has accumulated beyond a threshold value. When the threshold value is exceeded, an alarm is given and power is supplied to the battery fault detection subunit. The battery fault detection subunit is used to illuminate and indicate when the battery is fully charged after being powered on; The input end of the voltage accumulation judgment subunit is connected to the output end of the voltage processing unit, the output end of the voltage accumulation judgment subunit is connected to the first input end of the battery fault detection subunit, and the second input end of the battery fault detection subunit is connected to the output end of the energy storage consumption unit.

7. The energy-saving control device for an electric wheel dump truck according to claim 6, characterized in that: The voltage accumulation judgment subunit includes a second resistor, a third resistor, a first amplifier, a fifth diode, and a speaker. One end of the second resistor is connected to the output end of the voltage processing unit, the other end of the second resistor is connected to one end of the third resistor and the in-phase end of the first amplifier, the other end of the third resistor is grounded, the inverting end of the first amplifier is connected to a reference voltage, the output end of the first amplifier is connected to one end of the speaker and the first input end of the battery fault detection subunit, the other end of the speaker is connected to the positive electrode of the fifth diode, and the negative electrode of the fifth diode is grounded.

8. The energy-saving control device for an electric wheel dump truck according to claim 6, characterized in that: The battery fault detection subunit includes a second amplifier, a tenth resistor, and a sixth diode. The power supply end of the second amplifier is connected to the output end of the voltage accumulation judgment subunit, the in-phase end of the second amplifier is connected to the output end of the energy storage consumption unit, the inverting end of the second amplifier is connected to the reference voltage, the output end of the second amplifier is connected to one end of the tenth resistor, the other end of the tenth resistor is connected to the positive electrode of the sixth diode, and the negative electrode of the sixth diode is grounded.

9. An energy-saving control method for an electric wheel dump truck, applied to the energy-saving control device for an electric wheel dump truck according to any one of claims 1 to 8, characterized in that: The energy-saving control method for an electric wheel dump truck comprises the following steps: Step 1: The diesel engine drives the main generator to generate electricity. The main generator outputs three-phase AC power, which is converted into DC power after passing through a rectifier bridge. The DC power is then converted into AC power through an inverter and output to the frequency converter. Step 2: When the electric wheel dump truck is in traction mode, the vehicle controller controls the inverter to drive the motor to rotate through the traction controller to drive the vehicle to travel; Step 3: When the electric wheel dump truck is in the electric braking mode, the motor becomes a generator to generate three-phase alternating current, which is input into the energy processing module for storage or consumption; Step 4: When the electric wheel dump truck is in traction mode again, the energy processing module outputs direct current, which is converted into alternating current through the inverter to power the frequency converter.

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