Energy management control method and system for extended-range mine car

Abstract

The invention relates to an energy management control method and system for an extended-range mine car, and belongs to the field of mining trucks. The method comprises a fixed-point working mode of the range extender, and comprises the following specific steps: acquiring vehicle driving required power; if the vehicle driving demand power is smaller than the vehicle driving power lower limit, the range extender requests the generated power to be 0; if the vehicle driving demand power is between the vehicle driving power lower limit and the vehicle driving power upper limit, the range extender request generated power is the first range extender generated power; if the vehicle driving demand power is larger than the vehicle driving power upper limit, the range extender request generated power is the second range extender generated power; the method is used for solving the problems that different working modes need to be judged and selected due to different working conditions in the vehicle running process, hardware such as a sensor and a chip with higher computing power are additionally added, cost is increased, and reliability is reduced.

Description

Technical Field

[0001] The invention relates to an energy management control method and system for an extended-range mining vehicle, belonging to the field of mining trucks. Background Art

[0002] The extended-range mining car is mainly composed of a range extender, a generator controller, a power battery, a drive motor, a motor controller, and a gearbox. Due to its large load capacity, the extended-range mining car requires a large power to drive uphill, which cannot be met by the power battery alone. At this time, the range extender is needed to provide energy; when going downhill, the braking feedback power generated by it is large, and the power battery cannot fully absorb it. At this time, the range extender is needed to consume it.

[0003] For example, the Chinese patent application publication with application publication number CN117141246A discloses a range-extended hybrid mining truck drive system and method, in which the range extender has multiple working modes, such as driving charging mode: when the power demand is not large and the range extender has surplus power, the range extender simultaneously provides energy to drive the vehicle and charge the battery; driving power enhancement mode: when the vehicle accelerates suddenly or requires high power in climbing conditions, the range extender and the power battery simultaneously provide energy to drive the vehicle; power following mode: when the vehicle requires stable power and the engine operates in the high-efficiency zone, the range extender generates electricity directly for the drive motor; in both modes, the range extender provides energy to meet the power demand.

[0004] However, the solution presets multiple modes, and different working modes need to be judged and selected due to different working conditions during vehicle driving, resulting in additional hardware such as sensors and chips with more powerful computing power, which in turn increases costs and reduces reliability.

[0005] Moreover, in this solution, the sum of the output power of the range extender and the power battery on uphill sections must meet the vehicle's power requirements. Since the required power and battery output power are constantly changing due to road conditions and battery status, the output power of the range extender is constantly changing. Therefore, the processor needs to continuously calculate and adjust the output power of the range extender during driving, which places high requirements on vehicle hardware and has poor reliability. Summary of the invention

[0006] The purpose of the present invention is to provide an energy management control method and system for an extended-range mining vehicle, which is used to solve the problems that the control strategy of the range extender of the extended-range mining vehicle in the prior art presets multiple modes, and different working modes need to be judged and selected due to different working conditions during vehicle driving, resulting in additional hardware such as sensors and chips with stronger computing power, thereby increasing costs and reducing reliability; and because the required power and battery output power are constantly changing due to road conditions and battery status, the output power of the range extender is constantly changing, so the processor needs to continuously calculate and adjust the output power of the range extender during driving, which has high requirements on vehicle hardware and poor reliability.

[0007] To achieve the above object, the solution of the present invention includes:

[0008] A technical solution of an energy management control method for an extended-range mining vehicle of the present invention includes a fixed-point working mode of a range extender, and the fixed-point working mode of the range extender includes the following steps: obtaining the vehicle driving demand power; if the vehicle driving demand power is less than the vehicle driving power lower limit, the range extender requests the power generation power to be 0; if the vehicle driving demand power is between the vehicle driving power lower limit and the vehicle driving power upper limit, the range extender requests the power generation power to be the first range extender power generation power; if the vehicle driving demand power is greater than the vehicle driving power upper limit, the range extender requests the power generation power to be the second range extender power generation power; the second range extender power generation power is greater than the first range extender power generation power; the vehicle driving power lower limit, the vehicle driving power upper limit, the first range extender power generation power and the second range extender power generation power are calibrated according to the climbing conditions most commonly faced by the mining vehicle, so that the mining vehicle meets the discharge requirements of the power battery for a certain period of time under the corresponding climbing conditions.

[0009] Furthermore, if the SOC of the power battery is greater than the first threshold, the power generation power requested by the range extender is also multiplied by a correction factor less than 1 to avoid overcharging of the power battery.

[0010] Furthermore, if the actual charging power of the power battery is greater than the maximum charging power of the power battery, the power generation power requested by the range extender is the sum of the vehicle driving demand power and the maximum charging power of the power battery.

[0011] Furthermore, an energy management control method for an extended-range mining vehicle of the present invention also includes a full-power following control mode of the range extender, and the specific steps are: obtaining the vehicle driving demand power, and the range extender outputs the vehicle driving demand power to ensure that the power battery SOC remains within the set range.

[0012] Furthermore, the output power of the range extender is the vehicle driving demand power multiplied by a correction factor greater than 1, and the correction factor is used to compensate for the power loss caused by the efficiency of the transmission system.

[0013] Further, if the power battery SOC is lower than the second threshold, the range extender requests the power generation power to be the sum of the vehicle driving demand power and the mandatory power, and the mandatory power is used to charge the power battery.

[0014] Furthermore, the energy management control method of the extended-range mining vehicle of the present invention further includes a braking feedback energy management control step:

[0015] 1) Obtain vehicle braking feedback power and maximum charging power of power battery;

[0016] 2) If the vehicle's braking feedback power is less than the maximum charging power of the power battery, the power consumption of the range extender is 0; if the vehicle's braking feedback power is greater than the maximum charging power of the power battery, the power consumption of the range extender is the vehicle's braking feedback power minus the maximum charging power of the power battery.

[0017] Furthermore, the power consumption of the range extender needs to be multiplied by a correction factor greater than 1 to avoid the range extender consuming insufficient braking feedback power so that the power battery charging power is greater than the maximum charging power of the power battery.

[0018] A technical solution of an energy management control system for an extended-range mining vehicle of the present invention includes a processor, and the processor is used to execute the steps of implementing the energy management control method for the extended-range mining vehicle as described above.

[0019] The beneficial effects of the present invention are as follows: the present invention provides a new fixed-point working mode for the range extender, and calibrates the driving power threshold and the power generation power of the range extender according to the load conditions and climbing conditions of the vehicle in most cases. During the operation of the mine car, it is only necessary to compare the current vehicle driving demand power with the pre-set threshold to meet the vehicle driving demand power under the corresponding climbing conditions, and ensure that the range extender has surplus power generation under some flat roads or gentle slopes, and can prepare for the continuous discharge of the power battery in subsequent climbing conditions to avoid power battery power loss. It solves the problem that the mine car driving in the prior art needs to judge and select different working modes due to different working conditions, resulting in additional hardware such as sensors and chips with stronger computing power, thereby increasing costs and reducing reliability; and because the required power and battery output power are constantly changing due to road conditions and battery status, the output power of the range extender is constantly changing, so the processor needs to continuously calculate and adjust the output power of the range extender during driving, which has high requirements for vehicle hardware and poor reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a driving energy management flow chart;

[0021] Figure 2 It is the flow chart of brake feedback energy management. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail in a clear and complete manner in conjunction with the accompanying drawings and embodiments.

[0023] Method Example:

[0024] In order to ensure the driving power and braking safety of the extended-range mining vehicle, the present invention proposes an energy management control method for the extended-range mining vehicle, and its technical solution is as follows:

[0025] This embodiment is divided into driving energy management and braking feedback energy management. In driving energy management, the range extender sends out power, which is divided into range extender fixed-point operation and range extender full-power following according to different needs; in braking feedback energy management, the range extender consumes power according to different situations.

[0026] The vehicle is calibrated before leaving the factory. First, the driving power threshold is calibrated according to the most common working conditions faced by the vehicle, such as load, climbing slope and length. The driving power threshold includes the vehicle driving power upper limit p 驱1 and the vehicle driving power lower limit p 驱2 ; and calibration of the range extender power generation, the range extender power generation includes the first range extender power generation P 增程器发1 and the second range extender power generation power P 增程器发2 The calibration of parameters ensures that the mine car meets the discharge requirements of the power battery for a certain period of time under the corresponding climbing conditions. For example, under the corresponding climbing conditions, the range extender generates electricity in the flat section to charge the power battery in time to meet the discharge requirements of the power battery in the subsequent steep slope section.

[0027] like Figure 1 The figure shows the fixed-point work management method of the range extender. The overall process is: according to the driver's throttle opening and vehicle speed as well as the required driving torque output by the vehicle controller, the vehicle driving demand power is obtained.

[0028] Determine the vehicle driving power requirement P 驱 Is it less than or equal to the vehicle driving power upper limit P? 驱1 If so, the range extender requests a power generation power of 0, that is, P 增程器发 =0; otherwise, when p 驱1 <p 驱 <p 驱2 When the range extender requests the power generation power to be the first range extender power generation power P 增程器发1 , that is, P 增程器发 =p 增程器1 When p 驱 ≥p 驱2 When the range extender requests the power generation power to be the second range extender power generation power P 增程器发2 , that is, P 增程器发 =p 增程器2 ; The power generation of the first range extender before leaving the factory P 增程器发1 , the second range extender power generation P 增程器发2 It can be calibrated larger according to the actual parameters of the range extender to allow the range extender to generate surplus power and prepare for the continuous discharge of the power battery when climbing.

[0029] As a further improvement, if the power battery SOC is higher than a preset threshold SOC1, the range extender's requested power generation power needs to be multiplied by a correction factor less than 1 to avoid overcharging the power battery. In addition, the power battery's maximum charging power Limit the range extender power generation. If the actual charging power p 电池 Greater than the maximum charging power p of the power battery 充电 , then the power generation power of the range extender is: P 增程器发 =p 驱 +p 充电 .

[0030] When the range extender is in full power following mode, the required power generation power of the range extender is P 驱 , that is, P 增程器发 =p 驱 ; If the power battery SOC is lower than a preset threshold SOC2, the forced power generation power is increased on the basis of the power generation power, that is, P 增程器发 =p 驱 +p 强制 , when the power battery is higher than a preset threshold SOC3, p 强制 The output power of the range extender is the vehicle driving demand power multiplied by a correction factor greater than 1, which is used to compensate for the power loss caused by the efficiency of the transmission system.

[0031] like Figure 2 The figure shows the braking feedback energy management method. The overall process is: according to the driver's throttle opening and vehicle speed as well as the required driving torque output by the vehicle controller, the vehicle braking feedback required power is obtained. When p 回馈 ≤p 充电 When the braking feedback is fully recovered to the power battery, the power consumption of the range extender is required to be 0, that is, P 增程器耗 =0; when p 回馈 >p 充电 When all the power of braking feedback is not fully recovered by the power battery, the power consumption of the range extender is requested to be P 增程器耗 =p 回馈 -p 充电 The power consumption of the range extender needs to be multiplied by a correction factor greater than 1 to avoid insufficient braking feedback power consumption by the range extender.

[0032] Specifically, the power consumption of the range extender is achieved by the generator of the range extender operating in the motor mode and reversely dragging the internal combustion engine.

[0033] System Example:

[0034] An energy management and control system for an extended-range mining vehicle of the present invention includes a processor, which executes computer program instructions to implement an energy management and control method for an extended-range mining vehicle introduced in a method embodiment. The method has been introduced clearly enough in the method embodiment and will not be repeated here.

Claims

1. An energy management control method for an extended-range mining vehicle, characterized in that: It includes a fixed-point working mode of the range extender, and the fixed-point working mode of the range extender includes the following steps: obtaining the vehicle driving demand power; if the vehicle driving demand power is less than the vehicle driving power lower limit, the range extender requests the power generation power to be 0; if the vehicle driving demand power is between the vehicle driving power lower limit and the vehicle driving power upper limit, the range extender requests the power generation power to be the first range extender power generation power; if the vehicle driving demand power is greater than the vehicle driving power upper limit, the range extender requests the power generation power to be the second range extender power generation power; the second range extender power generation power is greater than the first range extender power generation power; the vehicle driving power lower limit, the vehicle driving power upper limit, the first range extender power generation power and the second range extender power generation power are calibrated according to the climbing conditions most commonly faced by the mine car, so that the mine car can meet the discharge requirements of the power battery for a certain period of time under the corresponding climbing conditions.

2. The energy management control method of the extended-range mining vehicle according to claim 1, characterized in that: In the fixed-point working mode of the range extender, if the SOC of the power battery is greater than the first threshold, the power generation power requested by the range extender is also multiplied by a correction coefficient less than 1 to avoid overcharging of the power battery.

3. The energy management control method of the extended-range mining vehicle according to claim 1, characterized in that: In the fixed-point working mode of the range extender, if the actual charging power of the power battery is greater than the maximum charging power of the power battery, the power generation power requested by the range extender is the sum of the vehicle driving demand power and the maximum charging power of the power battery.

4. The energy management control method of the extended-range mining vehicle according to claim 1, characterized in that: It also includes a full-power follow-up control mode of the range extender, which includes the following steps: obtaining the vehicle driving demand power, and the range extender outputs the vehicle driving demand power to ensure that the power battery SOC remains within a set range.

5. The energy management control method for the extended-range mining vehicle according to claim 4, characterized in that: The range extender outputs power according to the vehicle driving demand, including: the output power of the range extender is the vehicle driving demand power multiplied by a correction coefficient greater than 1, and the correction coefficient is used to compensate for power loss caused by transmission system efficiency.

6. The energy management control method for the extended-range mining vehicle according to claim 4, characterized in that: In the full power following control mode of the range extender, if the power battery SOC is lower than the second threshold, the range extender requests the power generation power to be the sum of the vehicle driving demand power and the forced power, and the forced power is used to charge the power battery.

7. The energy management control method for the extended-range mining vehicle according to claim 1, characterized in that: It also includes the steps of brake regenerative energy management control: 1) Obtain vehicle braking feedback power and maximum charging power of power battery; 2) If the vehicle's braking feedback power is less than the maximum charging power of the power battery, the power consumption of the range extender is 0; if the vehicle's braking feedback power is greater than the maximum charging power of the power battery, the power consumption of the range extender is the vehicle's braking feedback power minus the maximum charging power of the power battery.

8. The energy management control method for the extended-range mining vehicle according to claim 7, characterized in that: The power consumption of the range extender needs to be multiplied by a correction factor greater than 1 to avoid the range extender consuming insufficient braking feedback power so that the power battery charging power is greater than the maximum charging power of the power battery.

9. An energy management and control system for an extended-range mining vehicle, comprising a processor, characterized in that: The processor is used to execute a computer program to implement the steps of the energy management control method for an extended-range mining vehicle as described in any one of claims 1 to 8.

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