Parallel hybrid control method, system and working machine

Abstract

The application belongs to the technical field of hybrid systems, and discloses a parallel hybrid control method, a parallel hybrid control system and engineering machinery, wherein the control method comprises: whole machine high-voltage power component self-detection; the electric quantity of an electric energy storage component meets a charging threshold value; the whole machine normally works, and the total demand power of the whole machine is acquired; the working mode of a power generation motor is controlled according to the total demand power, and the working mode comprises a motor mode and a generator mode; the control system comprises an engine, the power generation motor, the electric energy storage component and a power coupling device, the power generation motor is electrically connected with the electric energy storage component, and the engine and the power generation motor are connected with the power coupling device respectively; the engineering machinery comprises the parallel hybrid control system. The parallel hybrid control method, the parallel hybrid control system and the engineering machinery can adaptively charge or discharge the electric energy storage component according to the actual working condition of the whole machine, and effectively improve the efficiency and fuel economy of the whole machine.

Description

Technical Field

[0001] This invention relates to the field of hybrid system technology, and in particular to a parallel hybrid control method, system, and engineering machinery. Background Technology

[0002] In existing technologies, most construction machinery uses series hybrid systems, where the three main energy systems—diesel engine, generator, and electric motor—are connected in series. The diesel engine drives the generator to produce electricity, which in turn drives the electric motor. The energy-saving advantage of series hybrid systems lies in maximizing efficiency, but the overall efficiency is relatively low. To meet the demands of various operating conditions, the power battery needs frequent charging and discharging, placing high demands on the performance of both the electric motor and the battery. Furthermore, the dynamic losses during engine start-stop operations increase the overall power loss of the system, resulting in relatively low energy conversion efficiency and poor fuel economy. Summary of the Invention

[0003] The purpose of this invention is to provide a parallel hybrid control method, system, and engineering machinery that can adaptively charge or discharge the energy storage device according to the actual working conditions of the machine, effectively improving the overall efficiency and fuel economy.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] A parallel hybrid control method includes the following steps:

[0006] S100, Self-testing of high-voltage power components of the whole machine;

[0007] S200, the energy storage device's power meets the charging threshold;

[0008] S300, the whole machine is working normally, obtain the total power demand of the whole machine;

[0009] S400. Control the operating mode of the generator motor according to the total power demand, wherein the operating mode of the generator motor includes a motor mode and a generator mode; wherein...

[0010] When in motor mode, the energy storage device supplies power to the generator motor;

[0011] When in generator mode, the generator motor charges the energy storage device.

[0012] Preferably, step S100 includes:

[0013] S110, Low-voltage power-on for the entire unit;

[0014] S120. Self-test of high-voltage electrical components of the whole machine to determine whether the self-test of the whole machine is successful;

[0015] If yes, proceed to step S130; if no, the alarm device sounds.

[0016] S130. Power on the entire machine under high voltage and determine whether the high voltage power-on is successful.

[0017] If yes, proceed to step S140; if no, the alarm device sounds.

[0018] S140, the engine starts and the generator motor enters the enabled state.

[0019] Preferably, step S200 includes:

[0020] S210. Determine whether the power of the energy storage device is less than the charging threshold; wherein, the charging threshold is the minimum power value of the energy storage device before the construction machinery enters the working mode;

[0021] If so, the generator motor is in generator mode, and the generator motor charges the energy storage device until the energy storage device has a charge level not less than the charging threshold.

[0022] If not, proceed to step S300.

[0023] Preferably, in step S210, after the generator motor charges the energy storage device, the following step is further included:

[0024] S220: Determine if the charging time has expired;

[0025] If so, the generator motor will stop working, and the entire machine will display a charging timeout message;

[0026] If not, then the generator motor will remain in generator mode.

[0027] Preferably, step S400 includes:

[0028] S410. Determine whether the total power demand is greater than the switching threshold; wherein, the switching threshold is the minimum power output required when the construction machinery needs to switch to heavy-load mode;

[0029] If yes, proceed to step S420; if no, determine whether to switch to light load mode based on the current power level of the energy storage device.

[0030] S420. Determine whether the power of the energy storage device is less than a lower threshold; wherein, the lower threshold is the minimum power value of the energy storage device before the construction machinery enters the heavy load mode;

[0031] If not, then control the generator motor to motor mode and start in heavy load mode.

[0032] Preferably, if step S420 determines that it is yes, then the generator motor is controlled to be in generator mode and not started in heavy load mode.

[0033] Preferably, in step S410, determining whether to switch to light load mode based on the current power level of the energy storage device is specifically as follows:

[0034] S430: Obtain the current power level of the energy storage device;

[0035] S440. Determine whether the power of the energy storage device is less than the upper limit threshold; wherein, the upper limit threshold is the maximum power value that the energy storage device can hold.

[0036] If so, the generator motor is in generator mode, and the generator motor charges the energy storage device until the energy storage device has a charge level not less than the upper limit threshold.

[0037] Preferably, if step S440 determines no, then the generator motor does not work.

[0038] A parallel hybrid control system, employing any of the parallel hybrid control methods described above, the parallel hybrid control system comprising an engine, a generator motor, an energy storage device, and a power coupling device, wherein the generator motor is electrically connected to the energy storage device, and the engine and the generator motor are respectively connected to the power coupling device.

[0039] An engineering machine includes the above-mentioned parallel hybrid control system, the engineering machine includes a chassis, and the parallel hybrid control system is mounted on the chassis.

[0040] Beneficial effects:

[0041] The parallel hybrid control method provided by this invention first performs a self-test on the high-voltage electrical components of the entire machine to ensure successful high-voltage energization. Then, it ensures that the energy storage device has sufficient charge to meet the charging threshold, guaranteeing that the energy storage device has enough charge before the construction machinery enters the working mode. After the charge is confirmed, the entire machine operates normally, and the total power demand of the entire machine is obtained according to different operating conditions. The operating mode of the generator motor is controlled according to the total power demand. Specifically, when the total power demand of the entire machine is high, the engine's own output power is insufficient to meet the requirements. At this time, the generator motor is in motor mode, the energy storage device supplies power to the generator motor, and the generator motor outputs positive torque to the power coupling device, participating in power output together with the engine. This mode corresponds to the heavy-load mode. When the total power demand of the entire machine is low, the engine's own output power is sufficient to meet the requirements. At this time, the generator motor is in generator mode, the generator motor outputs negative torque, generates electrical energy, and delivers it to the energy storage device to charge the energy storage device. The above method can adaptively charge or discharge the energy storage device according to different operating conditions and application scenarios by determining the total power demand of the entire machine, effectively improving the overall efficiency and fuel economy.

[0042] The parallel hybrid control system provided by this invention applies the above-mentioned parallel hybrid control method, which can adaptively charge or discharge the energy storage device according to the actual operating conditions of the whole machine, effectively improving the overall efficiency and fuel economy.

[0043] The engineering machinery provided by this invention includes the above-mentioned parallel hybrid control system, which can adaptively charge or discharge the energy storage device according to the actual working conditions of the whole machine, effectively improving the efficiency of the whole machine and fuel economy. Attached Figure Description

[0044] Figure 1 This is a flowchart illustrating the parallel hybrid control method provided by the present invention;

[0045] Figure 2 This is a schematic diagram of the specific process of the parallel hybrid control method provided by the present invention;

[0046] Figure 3 This is a schematic diagram of the parallel hybrid control system provided by the present invention.

[0047] In the picture:

[0048] 1. Engine; 2. Generator motor; 3. Energy storage device; 4. Power coupling device. Detailed Implementation

[0049] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0050] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0051] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0052] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0053] This embodiment provides a parallel hybrid control method. (Refer to...) Figures 1 to 3 As shown, the parallel hybrid control method mainly includes the following steps:

[0054] S100, Self-testing of high-voltage power components of the whole machine;

[0055] S200, the energy storage device 3 has enough power to meet the charging threshold;

[0056] S300, the whole machine is working normally, obtain the total power demand of the whole machine;

[0057] S400. The operating mode of the generator motor 2 is controlled according to the total power demand. The operating modes of the generator motor 2 include motor mode and generator mode. When in motor mode, the energy storage device 3 supplies power to the generator motor 2. When in generator mode, the generator motor 2 charges the energy storage device 3.

[0058] In this embodiment, the method first performs a self-test on the high-voltage electrical components of the entire machine to ensure that the high-voltage components can be successfully energized. Then, it ensures that the energy storage device 3 has sufficient charge to meet the charging threshold, ensuring that the energy storage device 3 has enough charge before the construction machinery enters the working mode. After the charge is confirmed, the entire machine operates normally, and the total power demand of the entire machine is obtained according to different operating conditions. The working mode of the generator motor 2 is controlled according to the total power demand. Specifically, when the total power demand of the entire machine is high, the output power of the engine 1 is insufficient to meet the requirements. At this time, the generator motor 2 is in motor mode, the energy storage device 3 supplies power to the generator motor 2, and the generator motor 2 outputs positive torque to the power coupling device 4, participating in power output together with the engine 1. This mode corresponds to the heavy-load mode. When the total power demand of the entire machine is low, the output power of the engine 1 is sufficient to meet the requirements. At this time, the generator motor 2 is in generator mode, the generator motor 2 outputs negative torque, generates electrical energy and sends it to the energy storage device 3 to charge the energy storage device 3. The above method can adaptively charge or discharge the energy storage device 3 according to different operating conditions and application scenarios by determining the power demand of the whole machine, thereby effectively improving the efficiency of the whole machine and fuel economy.

[0059] In this embodiment, the energy storage device 3 can be configured as a power battery or a supercapacitor, and no further limitations are imposed here.

[0060] In this embodiment, step S100 includes:

[0061] S110, Low-voltage power-on for the entire unit;

[0062] S120. Self-test of high-voltage electrical components of the whole machine to determine whether the self-test of the whole machine is successful;

[0063] If yes, proceed to step S130; if no, the alarm device sounds.

[0064] S130. Power on the entire machine under high voltage and determine whether the high voltage power-on is successful.

[0065] If yes, proceed to step S140; if no, the alarm device sounds.

[0066] S140, Engine 1 starts, and generator motor 2 enters the enabled state.

[0067] Specifically, the process begins with low-voltage power-on of the entire machine. After low-voltage power-on, the high-voltage electrical components of the vehicle undergo a self-test to ensure that each component is fault-free. Once the high-voltage electrical components have successfully completed their self-test, the entire machine is then powered on at high voltage. The voltage, current, and other electrical signal data from each internal high-voltage electrical component indicate whether the high-voltage power-on was successful. It is worth noting that if some components fail to self-test during the high-voltage electrical component self-test process, it indicates that the overall vehicle self-test has failed, triggering an alarm and prompting the operator to troubleshoot the internal high-voltage electrical components. Conversely, if some components fail to power on during the high-voltage power-on process, resulting in abnormal voltage, current, and other electrical signal data for these components, it indicates that the overall high-voltage power-on has failed, triggering an alarm and prompting the operator to troubleshoot the internal high-voltage electrical components.

[0068] Optionally, the alarm device can be set as an indicator light installed in the cab of the construction machinery. When an alarm is triggered, the indicator light can perform actions such as lighting up, changing color, and flashing.

[0069] Optionally, the alarm device can be set as a buzzer, which will sound when an alarm is triggered to promptly remind the operator.

[0070] In this embodiment, step S200 includes:

[0071] S210. Determine whether the power of the energy storage device 3 is less than the charging threshold; wherein, the charging threshold is the minimum power value that the energy storage device 3 has before the construction machinery enters the working mode.

[0072] If so, the generator motor 2 is in generator mode, and the generator motor 2 charges the energy storage device 3 until the energy storage device 3 has a charge of not less than the charging threshold.

[0073] If not, proceed to step S300.

[0074] Specifically, before the machine operates normally, the remaining power in the energy storage device 3 needs to be checked. This ensures that the energy storage device 3 has sufficient power to meet the charging threshold, guaranteeing that the construction machinery has enough power before entering operating mode. Specifically, if the energy storage device 3 has a power level not less than the charging threshold, the construction machinery can operate normally directly; if the energy storage device 3 has a power level less than the charging threshold, before the machine operates normally, the generator motor 2 must be driven to operate in generator mode to charge the energy storage device 3 until the energy storage device 3 has a power level not less than the charging threshold, thus meeting the power requirements.

[0075] In this embodiment, after the generator motor 2 charges the energy storage device 3 in step S210, the following steps are also included:

[0076] S220: Determine if the charging time has expired;

[0077] If yes, the generator motor 2 will stop working and the whole machine will indicate a charging timeout; if no, the generator motor 2 will continue to be in generator mode.

[0078] Specifically, the charging progress of the energy storage device 3 can be determined by judging the charging time. Specifically, when the charging time reaches a threshold time, it indicates that the energy storage device 3 has been charged to a level not less than the charging threshold. This state can be a charge slightly exceeding the charging threshold, or the energy storage device 3 being fully charged. If charging continues, it indicates that the charging time has expired, at which point the generator motor 2 stops working, ceasing charging of the energy storage device 3. Overall machine alerts can be provided through indicator lights on the cab display screen, etc., to promptly remind the operator and ensure that the construction machinery can enter a normal working state.

[0079] In step S300, the total power demand of the entire machine can be achieved by retrieving preset values ​​corresponding to different working conditions within the controller. Specifically, when the construction machinery is set as an excavator, different preset working conditions can be preset within the machine controller, such as excavating mud and sand, excavating hard soil, and excavating soft soil. These correspond to different power applied to the load ends such as the excavator boom, stick, and bucket. Therefore, different preset values ​​of total power demand can be preset within the machine controller. When the actual working condition matches the corresponding preset working condition, the corresponding total power demand value is retrieved.

[0080] In this embodiment, step S400 includes:

[0081] S410. Determine whether the total power demand is greater than the switching threshold; where the switching threshold is the minimum power output required when the construction machinery needs to switch to heavy-load mode;

[0082] If yes, proceed to step S420; if no, determine whether to switch to light load mode based on the current power level of the energy storage device 3.

[0083] S420. Determine whether the power of the energy storage device 3 is less than the lower threshold; wherein, the lower threshold is the minimum power value of the energy storage device 3 before the construction machinery enters the heavy load mode;

[0084] If not, then control generator motor 2 to start in motor mode and heavy load mode.

[0085] Specifically, corresponding to the total power demand, there is a switching threshold, which characterizes whether the construction machinery enters heavy-load mode. Specifically, when the total power demand exceeds the switching threshold, it indicates that engine 1 alone cannot provide sufficient power to the load, necessitating the use of generator motor 2 as a power output source. At this point, the charge level of energy storage device 3 is further assessed to determine if it is below a lower threshold. If the charge level is not below the lower threshold, generator motor 2 is controlled to operate in motor mode, outputting positive torque, and heavy-load mode is activated. Energy storage device 3 supplies power to generator motor 2, which outputs positive torque to power coupling device 4, participating in power output together with engine 1. When the total power demand is not greater than the switching threshold, it indicates that engine 1 alone can provide sufficient power to the load. At this point, the current charge level of energy storage device 3 is used to determine whether to switch to light-load mode, i.e., whether generator motor 2 needs to operate in generator mode to charge energy storage device 3.

[0086] Furthermore, if step S420 determines that it is yes, then the generator motor 2 is controlled to be in generator mode, and the heavy-load mode is not started. Specifically, when it is determined that the energy storage device 3 has less than the lower threshold, the energy storage device 3 does not have enough energy to support the generator motor 2 for a long time, so the heavy-load mode cannot be started at this time. At this time, the generator motor 2 can be directly controlled to be in generator mode, outputting negative torque, and charging the energy storage device 3 in a timely manner to ensure that the energy storage device 3 can be replenished in time to exceed the lower threshold. When the energy storage device 3 exceeds the lower threshold, the generator motor 2 can be controlled to switch to motor mode, outputting positive torque, and then the heavy-load mode is started. This situation is equivalent to delaying the start of the heavy-load mode.

[0087] In this embodiment, in step S410, determining whether to switch to light load mode based on the current power level of the energy storage device 3 is specifically as follows:

[0088] S430: Obtain the current power level of the power storage device 3;

[0089] S440. Determine whether the energy storage device 3 has a capacity less than the upper limit threshold; where the upper limit threshold is the maximum capacity that the energy storage device 3 can hold.

[0090] If so, the generator motor 2 is in generator mode, and the generator motor 2 charges the energy storage device 3 until the energy storage device 3 has a charge of not less than the upper limit threshold.

[0091] Specifically, when the total power demand is not greater than the switching threshold, the generator motor 2 is controlled to operate based on the charge level of the energy storage device 3. The current charge level of the energy storage device 3 is obtained through sensing components such as a power sensor, and then compared with the upper limit threshold. If the charge level in the energy storage device 3 is still less than the upper limit threshold, the generator motor 2 operates in generator mode, outputting negative torque to charge the energy storage device 3 until the charge level in the energy storage device 3 is not less than the upper limit threshold.

[0092] Furthermore, if step S440 determines otherwise, the generator motor 2 will not operate. Specifically, if the energy storage device 3 has reached its upper limit threshold, the energy storage device 3 is full and cannot be charged further, and the generator motor 2 does not need to participate in the power coupling operation, then the generator motor 2 does not need to operate.

[0093] This embodiment also provides a parallel hybrid control system. The parallel hybrid control system applies the above-described parallel hybrid control method and includes an engine 1, a generator motor 2, an energy storage device 3, and a power coupling device 4. The generator motor 2 is electrically connected to the energy storage device 3, and the engine 1 and generator motor 2 are respectively connected to the power coupling device 4. The parallel hybrid control system provided in this embodiment, by applying the above-described parallel hybrid control method, can adaptively charge or discharge the energy storage device 3 according to the actual operating conditions of the entire vehicle, effectively improving overall vehicle efficiency and fuel economy.

[0094] This embodiment also provides a piece of construction machinery. The construction machinery includes the above-mentioned parallel hybrid control system, which can adaptively charge or discharge the energy storage device 3 according to the actual working conditions of the machine, effectively improving the overall efficiency and fuel economy.

[0095] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A parallel hybrid control method, characterized in that, Includes the following steps: S100, Self-testing of high-voltage power components of the whole machine; S200, the energy storage device (3) has a charge threshold; S300, the whole machine is working normally, obtain the total power demand of the whole machine; S400. Control the operating mode of the generator motor (2) according to the total power demand, wherein the operating mode of the generator motor (2) includes motor mode and generator mode; wherein, When in motor mode, the energy storage device (3) supplies power to the generator motor (2); When in generator mode, the generator motor (2) charges the energy storage device (3); Step S200 includes: S210. Determine whether the power of the energy storage device (3) is less than the charging threshold; wherein, the charging threshold is the minimum power value of the energy storage device (3) before the engineering machinery enters the working mode; If so, the generator motor (2) is in generator mode, and the generator motor (2) charges the energy storage device (3) until the energy storage device (3) has a charge of not less than the charging threshold. If not, proceed to step S300; In step S210, after the generator motor (2) charges the energy storage device (3), the following steps are also included: S220: Determine if the charging time has expired; If so, the generator motor (2) will stop working, and the whole machine will indicate that the charging timeout has occurred; If not, then the generator motor (2) will remain in generator mode. Step S400 includes: S410. Determine whether the total power demand is greater than the switching threshold; wherein, the switching threshold is the minimum power output required when the construction machinery needs to switch to heavy-load mode; If yes, proceed to step S420; if no, determine whether to switch to light load mode based on the current power of the energy storage device (3). S420. Determine whether the power of the energy storage device (3) is less than the lower limit threshold; wherein, the lower limit threshold is the minimum power value of the energy storage device (3) before the engineering machinery enters the heavy load mode; If not, then control the generator motor (2) to motor mode and start in heavy load mode; If step S420 determines that it is yes, then the generator motor (2) is controlled to be in generator mode and not started in heavy load mode; In step S410, determining whether to switch to light load mode based on the current power level of the energy storage device (3) is specifically as follows: S430, Obtain the current power level of the energy storage device (3); S440. Determine whether the power of the energy storage device (3) is less than the upper limit threshold; wherein, the upper limit threshold is the maximum power value that the energy storage device (3) can hold; If so, the generator motor (2) is in generator mode, and the generator motor (2) charges the energy storage device (3) until the energy storage device (3) has a charge of not less than the upper limit threshold.

2. The parallel hybrid control method according to claim 1, characterized in that, Step S100 includes: S110, Low-voltage power-on for the entire unit; S120. Self-test of high-voltage electrical components of the whole machine to determine whether the self-test of the whole machine is successful; If yes, proceed to step S130; if no, the alarm device sounds. S130. Power on the entire machine under high voltage and determine whether the high voltage power-on is successful. If yes, proceed to step S140; if no, the alarm device sounds. S140, the engine (1) starts and the generator motor (2) enters the enabled state.

3. The parallel hybrid control method according to claim 1, characterized in that, If step S440 determines no, then the generator motor (2) will not work.

4. A parallel hybrid control system, characterized in that, The parallel hybrid control method according to any one of claims 1-3 is used, wherein the parallel hybrid control system includes an engine (1), a generator motor (2), an energy storage device (3), and a power coupling device (4), wherein the generator motor (2) is electrically connected to the energy storage device (3), and the engine (1) and the generator motor (2) are respectively connected to the power coupling device (4).

5. An engineering machinery, characterized in that, The engineering machinery includes a chassis, and the parallel hybrid control system is mounted on the chassis, comprising the parallel hybrid control system as described in claim 4.

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