Energy management method and system for a hybrid electric drive heavy duty vehicle

Abstract

The application provides an energy management method and system of a hybrid electric drive heavy load vehicle, and relates to the technical field of heavy load vehicles.The method comprises the following steps: acquiring vehicle operation information of the vehicle and a residual charge amount of a second power source; when the vehicle state is in a normal driving state and the vehicle load is greater than a first weight threshold: if the vehicle is in a starting stage, controlling the first power source and the second power source to switch to a dual-power-source hybrid power supply mode; if the vehicle is not in the starting stage, when the vehicle operation slope is greater than zero, controlling the first power source and the second power source to switch to the dual-power-source hybrid power supply mode, and when the vehicle operation slope is less than or equal to zero, controlling the power supply mode of the first power source and the second power source according to the residual charge amount of the second power source; when the vehicle state is in a braking state, controlling the first power source to suspend power supply and the second power source to switch to a charging mode. New energy is used, braking energy is recycled, and the two power sources are dynamically controlled, so that energy saving and emission reduction are realized.

Description

Technical Field

[0001] The present invention relates to the technical field of heavy-duty vehicles, and in particular to an energy management method and system for a hybrid electric drive heavy-duty vehicle. Background Art

[0002] Various heavy-duty construction vehicles, such as special vehicles, off-road vehicles, and heavy-duty mining vehicles, are widely used in mines, large-scale construction projects, iron ore mines, coal storage yards, and other applications requiring large amounts of transportation. Heavy-duty construction vehicles are off-road vehicles and are primarily used in closed, fixed environments, such as ports, mines, and construction sites. They operate under relatively fixed operating conditions and road conditions, typically in a cyclical mode.

[0003] Existing heavy-duty construction vehicles are typically equipped with high-powered diesel engines, with fuel tank capacities ranging from several hundred to several thousand liters. Annual fuel consumption accounts for a significant portion of operating costs, and diesel engines also cause significant air pollution. Consequently, existing heavy-duty vehicles consume significant amounts of energy and are highly polluting. Summary of the Invention

[0004] The problem to be solved by the present invention is that existing heavy-duty vehicles use a large amount of energy and are highly polluting.

[0005] To solve the above problems, the present invention provides an energy management method for a hybrid electric drive heavy-duty vehicle, comprising:

[0006] Acquiring vehicle operation information of the vehicle and the remaining charge of the second power source, wherein the vehicle operation information includes vehicle status, vehicle load weight, and vehicle operation slope;

[0007] When the vehicle is in a normal driving state and the vehicle load is greater than a first weight threshold, determining whether the vehicle is in a starting phase;

[0008] When the vehicle is in a starting phase, controlling the first power source and the second power source to switch to a dual-power source hybrid power supply mode to simultaneously power the vehicle's drive motor, wherein the first power source is a hydrogen fuel power source and the second power source is a lithium battery power source;

[0009] When the vehicle is not in the starting stage, analyzing the vehicle running slope;

[0010] When the vehicle running gradient is greater than zero, controlling the first power source and the second power source to switch to a dual-power source hybrid power supply mode;

[0011] When the vehicle running gradient is less than or equal to zero, controlling the power supply modes of the first power source and the second power source according to the remaining charge of the second power source;

[0012] when the vehicle state is in a braking state, controlling the first power source to suspend power supply and the second power source to switch to a braking charging mode.

[0013] Compared with the prior art, the present application has the following beneficial effects:

[0014] The energy management method and system for the hybrid electric drive heavy-duty vehicle provided by the present application, by acquiring the vehicle running information and the residual charge amount of the second power source in real time, for example, the vehicle running information includes the vehicle state, the vehicle load and the vehicle running slope, monitoring the vehicle running information and the residual energy of the second power source, when the vehicle state is in a normal driving state and the vehicle load is greater than a first weight threshold, if the vehicle is in a starting stage, controlling the first power source and the second power source to switch to a dual-power-source hybrid power supply mode to supply power to the drive motor of the vehicle at the same time, so that the vehicle obtains a larger instantaneous driving torque, the vehicle starts quickly in a heavy-duty state, the starting time is reduced, the energy consumption caused by long and slow starting is avoided, and since the first power source and the second power source are both electrically driven, the pollution emission is small and the pollution to the environment is reduced; if the vehicle is not in the starting stage, it means that the vehicle is in a normal driving stage, at this time, the vehicle running slope is further analyzed; when the vehicle running slope is greater than zero, it means that the vehicle is in a climbing stage, the demand for driving energy suddenly increases, and a single power source may not be able to meet the climbing power demand at this time, at this time, the first power source and the second power source need to be controlled to switch to a dual-power-source hybrid power supply mode to ensure that the vehicle can smoothly and quickly pass through an uphill road section; when the vehicle running slope is less than or equal to zero, it means that the vehicle is in a downhill road section or a flat road section, at this time, the power supply mode of the first power source and the second power source needs to be controlled according to the residual charge amount of the second power source, the use of the second power source is increased to reduce the output of the first power source; therefore, when the vehicle state is in a braking state, the first power source is controlled to suspend power supply and the second power source is controlled to switch to a braking charging mode, the second power source can also be charged, and the charging recovers the braking energy, the energy in the second power source is consumed preferentially, and the braking energy can be recovered in time during braking, further achieving the purpose of energy saving and emission reduction.

[0015] Compared with the prior art, the present application has the following beneficial effects:

[0016] The application provides an energy management method for a hybrid electric drive heavy-load vehicle, which comprises the following steps: acquiring vehicle running information and a residual charge amount of a second power source in real time, wherein the vehicle running information comprises a vehicle state, a vehicle load and a vehicle running slope; monitoring the vehicle running information and the residual energy of the second power source; when the vehicle state is in a normal driving state and the vehicle load is greater than a first weight threshold, if the vehicle is in a starting stage, switching the first power source and the second power source to a dual-power-source hybrid power supply mode to simultaneously supply power to the drive motor of the vehicle, so that the vehicle obtains a larger instantaneous driving torque, the vehicle is quickly started in a heavy-load state, the starting time is reduced, energy consumption caused by long and slow starting is avoided, and the pollution to the environment is reduced due to the electric drive of the first power source and the second power source; if the vehicle is not in the starting stage, that is, the vehicle is in a normal driving stage, the vehicle running slope is further analyzed at this time; when the vehicle running slope is greater than zero, it indicates that the vehicle is in a climbing stage, the demand for driving energy suddenly increases, and a single power source may not be able to meet the climbing power demand at this time, so the first power source and the second power source need to be switched to the dual-power-source hybrid power supply mode to ensure that the vehicle can smoothly and quickly pass through an uphill road section; when the vehicle running slope is less than or equal to zero, it indicates that the vehicle is in a downhill road section or a flat road section, the power supply mode of the first power source and the second power source needs to be controlled according to the residual charge amount of the second power source to increase the use of the second power source to reduce the output of the first power source; therefore, when the vehicle state is in a braking state, the first power source is controlled to suspend power supply and the second power source is switched to a braking charging mode, the second power source can be charged, the braking energy is recovered, the energy in the second power source is preferentially consumed, the braking energy can be recovered in time during braking, and the purpose of energy saving and emission reduction is further achieved.

[0017] Optionally, when the vehicle running slope is less than or equal to zero, the power supply mode of the first power source and the second power source is controlled according to the residual charge amount of the second power source, and the power supply mode of the first power source and the second power source comprises the following steps:

[0018] When the vehicle running slope is less than or equal to zero, it is judged whether the residual charge amount of the second power source is greater than a preset charge amount threshold.

[0019] When the residual charge amount of the second power source is greater than the preset charge amount threshold, the first power source and the second power source are switched to the dual-power-source hybrid power supply mode.

[0020] When the residual charge amount of the second power source is less than or equal to the preset charge amount threshold, the first power source is switched to a single-power-source power supply mode and the second power source suspends power supply.

[0021] Optionally, when the first power source and the second power source switch to the dual-power hybrid power supply mode, the energy management method of the hybrid electric heavy-duty vehicle further comprises:

[0022] determining a required power of the vehicle according to the vehicle operation information;

[0023] determining whether the output power of the first power source is less than the required power;

[0024] when the output power of the first power source is greater than or equal to the required power, controlling the first power source to supply power and the second power source to be in a standby state;

[0025] when the output power of the first power source is less than the required power, determining a supplementary power of the second power source according to the required power and the output power of the first power source;

[0026] controlling the first power source and the second power source to supply power simultaneously according to the output power of the first power source and the supplementary power.

[0027] Optionally, the controlling the first power source and the second power source to supply power simultaneously according to the output power of the first power source and the supplementary power comprises:

[0028] determining whether the output power corresponding to the residual charge amount of the second power source is greater than the supplementary power;

[0029] when the output power corresponding to the residual charge amount of the second power source is greater than the supplementary power, controlling the output power of the first power source to be unchanged and the power output by the second power source to be the supplementary power;

[0030] when the output power corresponding to the residual charge amount of the second power source is less than or equal to the supplementary power, controlling the output power of the first power source to be increased and the supplementary power to be updated until the output power corresponding to the residual charge amount of the second power source is greater than the updated supplementary power, controlling the output power of the first power source to be the increased power and the power output by the second power source to be the updated supplementary power.

[0031] Optionally, the energy management method of the hybrid electric heavy-duty vehicle further comprises:

[0032] when the vehicle state is in the normal driving state and the vehicle load is less than or equal to a first load threshold, determining whether the residual charge amount of the second power source is greater than a preset charge amount threshold;

[0033] when the remaining charge amount of the second power source is greater than the preset charge amount threshold, controlling the second power source to switch to a single power source power supply mode and the first power source to suspend power supply;

[0034] when the remaining charge amount of the second power source is less than or equal to the preset charge amount threshold, controlling the first power source to switch to a single power source power supply mode and the second power source to suspend power supply.

[0035] Optionally, the energy management method of the hybrid electric heavy-duty vehicle further comprises:

[0036] when the vehicle state is in the standby state, determining whether the standby duration of the vehicle is greater than a preset standby duration;

[0037] when the standby duration is greater than the preset standby duration, controlling the first power source and the second power source to suspend power supply;

[0038] when the standby duration is less than or equal to the preset standby duration, determining whether the remaining charge amount of the second power source is greater than a preset charge amount threshold;

[0039] when the remaining charge amount of the second power source is greater than the preset charge amount threshold, controlling the second power source to switch to a single power source power supply mode and the first power source to suspend power supply;

[0040] when the remaining charge amount of the second power source is less than or equal to the preset charge amount threshold, controlling the first power source to switch to a single power source power supply mode and the second power source to suspend power supply.

[0041] Optionally, the energy management method of the hybrid electric heavy-duty vehicle further comprises:

[0042] when the first power source switches to a single power source power supply mode or the second power source switches to a single power source power supply mode, determining a torque instruction according to the output power of the first power source or the output power of the second power source;

[0043] sending the torque instruction to the motor of the vehicle to control the motor to drive the vehicle to run.

[0044] Optionally, the energy management method of the hybrid electric heavy-duty vehicle further comprises:

[0045] when the vehicle state is in the unloading state or the charged non-starting state, controlling the second power source to switch to a single power source power supply mode and the first power source to suspend power supply.

[0046] Optionally, the energy management method of the hybrid electric heavy-duty vehicle further comprises:

[0047] controlling the second power source to switch to a single power source power supply mode and the first power source to suspend power supply when the vehicle state is in an idling state.

[0048] In another aspect, the present application also provides an energy management system for a hybrid electric drive vehicle, comprising:

[0049] an information acquisition module configured to acquire vehicle operation information of the vehicle and a residual charge amount of the second power source, wherein the vehicle operation information comprises a vehicle state, a vehicle load and a vehicle operation slope;

[0050] a vehicle working condition monitoring module configured to determine whether the vehicle is in a starting stage when the vehicle state is in a normal driving state and the vehicle load is greater than a first load threshold;

[0051] a power source control module configured to control the first power source and the second power source to switch to a dual power source hybrid power supply mode to simultaneously supply power to the drive motor of the vehicle when the vehicle is in the starting stage;

[0052] the vehicle working condition monitoring module is further configured to analyze the vehicle operation slope when the vehicle is not in the starting stage;

[0053] the power source control module is further configured to control the first power source and the second power source to switch to the dual power source hybrid power supply mode when the vehicle operation slope is greater than zero, and to control the power supply mode of the first power source and the second power source according to the residual charge amount of the second power source when the vehicle operation slope is less than or equal to zero, and to control the first power source to suspend power supply and the second power source to switch to a braking charging mode when the vehicle state is in a braking state.

[0054] The energy management system for the hybrid electric drive vehicle in the present application has similar technical effects as the energy management method for the hybrid electric drive heavy load vehicle described above, and will not be described here in detail. BRIEF DESCRIPTION OF DRAWINGS

[0055] Figure 1 FIG. 1 is a structural schematic diagram of a drive system of a hybrid electric drive heavy load vehicle in an embodiment of the present application;

[0056] Figure 2 FIG. 2 is a flowchart of an energy management method for a hybrid electric drive heavy load vehicle in an embodiment of the present application;

[0057] Figure 3 FIG. 3 is a schematic diagram of an energy recovery circuit in a braking mode in an embodiment of the present application;

[0058] Figure 4A power source control flowchart in a dual-power-source hybrid power supply mode of an embodiment of the present application;

[0059] Figure 5 A structure schematic diagram of an energy management system of a hybrid electric drive heavy-duty vehicle in an embodiment of the present application. DETAILED DESCRIPTION

[0060] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0061] It is to be noted that the terms "first", "second", and the like in the description of the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0062] In the description of the present specification, the description referring to the terms "embodiment", "one embodiment", and "one implementation" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or implementation are included in at least one embodiment or implementation of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or implementation. Furthermore, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or implementations in an appropriate manner.

[0063] As Figure 1As shown, the driving system of the hybrid electric drive heavy-duty vehicle comprises a first power source, a second power source, a first conversion unit, a second conversion unit, an energy storage unit, a first DC / AC unit, a second DC / AC unit, a third DC / AC unit, a first traction motor M1, a second traction motor M2 and an auxiliary motor M3, the first power source is connected with the input end of the energy storage unit through the first conversion unit, the second power source is connected with the input end of the energy storage unit through the second conversion unit, the output end of the energy storage unit is connected with the first DC / AC unit, the second DC / AC unit and the third DC / AC unit respectively, the first DC / AC unit is connected with the first traction motor M1, the second DC / AC unit is connected with the second traction motor M2, and the third DC / AC unit is connected with the auxiliary motor M3. The first conversion unit and the second conversion unit both adopt a bidirectional conversion circuit. The first power source can be a hydrogen fuel power source, which has the characteristics of one-way output, slow start and power output rising, but can provide sustained high-power power output after power output; the second power source can be a lithium battery power source, which has the characteristics of bidirectional output, fast start and power output rising, and can output and recover energy, but the energy is limited and cannot meet the demand of long-time high-power output.

[0064] As shown in the figure, Figure 2 The energy management method of the hybrid electric drive heavy-duty vehicle provided by the application comprises:

[0065] Obtaining vehicle running information of the vehicle and a residual charge amount of the second power source, wherein the vehicle running information comprises parameters such as vehicle state, vehicle load, vehicle running slope, accelerator pedal percentage and current traction motor power.

[0066] Specifically, the vehicle state comprises normal driving state, braking state, standby state (started but not driving), unloading state, charged but not started state and driving idle state, which can be determined by vehicle driving speed, gear position, charging condition, driving condition of unloading components (such as hydraulic lifting components) and the like.

[0067] When the vehicle state is in the normal driving state and the vehicle load is greater than the first weight threshold, it is judged whether the vehicle is in the starting stage.

[0068] Specifically, when the speed of the vehicle starts from zero and slowly increases, this stage can be determined as the starting stage, if the speed of the vehicle does not start from zero and increases, it is considered as not the starting stage.

[0069] When the vehicle is in the starting stage, the first power source and the second power source are controlled to switch to a dual-power-source hybrid power supply mode to simultaneously supply power to the drive motor of the vehicle.

[0070] Specifically, since the vehicle load is greater than the first weight threshold, it indicates that the vehicle is in a heavy load state and is difficult to start, and a larger driving force is needed to drive the vehicle to overcome the friction. At this time, if only the first power source is used, the instantaneous power of the first power source may not be enough to make the vehicle travel quickly, and the vehicle can only travel slowly, which takes a long time, resulting in more energy output by the first power source. If the first power source and the second power source supply power at the same time, a larger instantaneous driving force can be achieved to make the vehicle start quickly, and the starting time is short, the overall waste of energy is reduced, thereby saving energy, and the energy supplement method of the first power source is only hydrogenation, and the emission is water, achieving zero emission and reducing pollution.

[0071] When the vehicle is not in the starting stage, the running slope of the vehicle is analyzed.

[0072] When the running slope of the vehicle is greater than zero, it indicates that the vehicle is in a climbing state, and the required power of the vehicle becomes larger at this time. A single power source may not be able to meet the vehicle travel demand, or a single power source cannot make the vehicle quickly pass through the climbing stage, so the first power source and the second power source need to be controlled to switch to a dual-power-source hybrid power supply mode.

[0073] When the running slope of the vehicle is less than or equal to zero, it indicates that the vehicle is in a flat road travel stage or a downhill stage, and the power supply mode of the first power source and the second power source is controlled according to the residual charge amount of the second power source.

[0074] When the vehicle state is in a braking state, the first power source is controlled to suspend power supply and the second power source is controlled to switch to a braking charging mode.

[0075] Specifically, as Figure 3 When the vehicle brakes, the energy generated by the rotation of the vehicle motor can be recovered, thereby converting this part of the energy into electrical energy and storing it in the energy storage unit. The energy storage unit charges the second power source, thereby realizing the recovery of braking energy, further reducing energy consumption, saving resources, and reducing pollution emissions. The bi-directional conversion circuit provides voltage matching and conversion functions to convert the power supply voltage of the first power source and the second power source into a voltage matched with the energy storage unit, thereby adapting to the motor voltage of the back end. When electric braking, the voltage of the energy storage unit is also converted into a voltage adapted to the second power source.

[0076] In the embodiment, by acquiring the vehicle running information of the vehicle and the residual charge amount of the second power source in real time, for example, the vehicle running information includes the vehicle state, the vehicle load and the vehicle running slope, the vehicle running information and the residual energy of the second power source are monitored, when the vehicle state is in the normal driving state and the vehicle load is greater than the first weight threshold, if the vehicle is in the starting stage, the first power source and the second power source are controlled to switch to the dual power source hybrid power supply mode to supply power to the driving motor of the vehicle at the same time, so that the vehicle obtains larger instantaneous driving torque, the vehicle starts quickly in the heavy load state, the starting time is reduced, the energy consumption caused by long and slow starting is avoided, and the pollution emission is small because the first power source and the second power source are both electric driving, thereby reducing the pollution to the environment; if the vehicle is not in the starting stage, that is, the vehicle is in the normal driving stage, the vehicle running slope is further analyzed at this time; when the vehicle running slope is greater than zero, it is indicated that the vehicle is in the climbing stage, the demand for driving energy suddenly increases, and a single power source may not be able to meet the climbing power demand at this time, at this time, the first power source and the second power source are controlled to switch to the dual power source hybrid power supply mode, so as to ensure that the vehicle can smoothly and quickly pass through the uphill road section; when the vehicle running slope is less than or equal to zero, it is indicated that the vehicle is in the downhill road section or the flat road section, at this time, the power supply mode of the first power source and the second power source is controlled according to the residual charge amount of the second power source, the use of the second power source is increased, and the output of the first power source is reduced; therefore, when the vehicle state is in the braking state, the first power source is controlled to suspend power supply and the second power source is switched to the braking charging mode, the second power source can also be charged, and the braking energy is recovered, the energy in the second power source is preferentially consumed, and the braking energy is recovered in time during braking, and the purpose of energy saving and emission reduction is further achieved.

[0077] In the optional embodiment of the application, when the vehicle running slope is less than or equal to zero, the power supply mode of the first power source and the second power source is controlled according to the residual charge amount of the second power source, including:

[0078] When the vehicle running slope is less than or equal to zero, it is judged whether the residual charge amount of the second power source is greater than a preset charge amount threshold. When the vehicle is heavy and the vehicle runs on flat road or downhill, it is further judged whether the second power source is used according to the residual charge amount of the second power source.

[0079] When the residual charge amount of the second power source is greater than the preset charge amount threshold, it indicates that the charge amount of the second power source is sufficient at this time, and the second power source can be put into use when the first power source is used, so as to reduce the energy consumption of the first power source. Therefore, the first power source and the second power source are switched to a dual-power source hybrid power supply mode, and after the electric energy of the second power source is used as much as possible, the energy consumption of the first power source is reduced, and the brake energy is recovered as much as possible.

[0080] When the residual charge amount of the second power source is less than or equal to the preset charge amount threshold, the electric energy of the second power source is less at this time, in order to prevent over-discharge of the second power source and to reserve a certain amount of electric energy for emergency, the second power source is not put into use at this time, and the first power source is switched to a single-power source power supply mode and the second power source is suspended.

[0081] In the embodiment, the vehicle is heavy-load running, if the vehicle is on a flat road or a downhill road, whether the second power source is put into use is dynamically controlled in combination with the residual charge amount of the second power source, the electric energy of the second power source is consumed as much as possible, and the brake energy is continuously recovered for subsequent use, so as to reduce the energy consumption of the first power source.

[0082] In an optional embodiment of the present application, as shown in Figure 4 When the first power source and the second power source are switched to the dual-power source hybrid power supply mode, the energy management method of the hybrid electric drive heavy-load vehicle further comprises:

[0083] According to the vehicle operation information, the demand power of the vehicle is determined.

[0084] It is judged whether the output power of the first power source is less than the demand power.

[0085] When the output power of the first power source is greater than or equal to the demand power, the first power source is controlled to supply power and the second power source is in standby state.

[0086] When the output power of the first power source is less than the demand power, according to the demand power and the output power of the first power source, the supplementary power of the second power source is determined.

[0087] According to the output power of the first power source and the supplementary power, the first power source and the second power source are controlled to supply power at the same time.

[0088] Specifically, normally, the vehicle control unit (VCU) and the power controller (TCU) automatically control according to the vehicle operating conditions and the residual charge amount of the second power source. The power controller (TCU) calculates and generates the required power according to the vehicle load, inclination, accelerator pedal percentage, and current traction motor power, and sends the required power to the first power source. If the output power of the first power source meets the required power, the torque command is directly sent to the traction motor. If the output power of the first power source does not meet the required power, the power controller (TCU) calculates the supplemental power required by the second power source, and the TCU controls the corresponding power output of the second power source, so that the combined power of the first power source and the second power source meets the required power, and the torque command is sent to the traction motor.

[0089] In an optional embodiment of the present application, the control of the first power source and the second power source to supply power simultaneously according to the output power of the first power source and the supplemental power comprises:

[0090] determining whether the output power corresponding to the residual charge amount of the second power source is greater than the supplemental power.

[0091] when the output power corresponding to the residual charge amount of the second power source is greater than the supplemental power, the output power of the first power source is unchanged and the power output by the second power source is the supplemental power.

[0092] when the output power corresponding to the residual charge amount of the second power source is less than or equal to the supplemental power, the output power of the first power source is increased and the supplemental power is updated until the output power corresponding to the residual charge amount of the second power source is greater than the updated supplemental power, the output power of the first power source is the increased power and the power output by the second power source is the updated supplemental power.

[0093] Specifically, if the output power corresponding to the SOC (amount of residual charge) of the second power source at this time is greater than the supplemental power, the first power source maintains the existing power output and the power output by the second power source is the supplemental power; if the output power corresponding to the SOC (amount of residual charge) of the second power source at this time is less than or equal to the supplemental power, the first power source starts to increase the existing power output and updates the supplemental power until the output power corresponding to the amount of residual charge of the second power source is greater than the updated supplemental power, the output power of the first power source is controlled to be the increased power and the power output by the second power source is the updated supplemental power. The TCU monitors the running state of the vehicle in real time, monitors the output power of the first power source and the second power source in real time, calculates the required output power of the first power source and the second power source in real time, dynamically allocates the power of the first power source and the second power source, and the energy management strategy of the dual-power-source hybrid power supply mode meets the vehicle performance requirement, fully utilizes the required power output by the two power sources in cooperation according to the vehicle running power requirement.

[0094] In an optional embodiment of the present application, the energy management method of the hybrid electric drive heavy-duty vehicle further comprises:

[0095] When the vehicle state is in the normal driving state and the vehicle load is less than or equal to the first weight threshold, it indicates that the vehicle is in an empty or light load driving state, and whether the amount of residual charge of the second power source is greater than a preset charge amount threshold is determined.

[0096] When the amount of residual charge of the second power source is greater than the preset charge amount threshold, the second power source is controlled to switch to a single-power-source power supply mode and the first power source is suspended.

[0097] When the amount of residual charge of the second power source is less than or equal to the preset charge amount threshold, the first power source is controlled to switch to a single-power-source power supply mode and the second power source is suspended.

[0098] Specifically, when the vehicle is in an empty or light load driving state, the power demand of the vehicle is not large at this time, and a single power source can meet the driving demand of the vehicle. At this time, the electric energy of the second power source needs to be consumed first. When the electric energy of the second power source decreases to be less than or equal to the preset charge amount threshold, the first power source is controlled to switch to a single-power-source power supply mode and the second power source is suspended, that is, the first power source is put into use and the second power source is suspended. The second power source energy is used preferentially, and the effect of energy saving and emission reduction is further optimized on the basis of the first power source being a new energy source.

[0099] In an optional embodiment of the present application, the energy management method of the hybrid electric drive heavy-duty vehicle further comprises:

[0100] When the vehicle state is in the standby state, it is judged whether the standby duration of the vehicle is greater than a preset standby duration, wherein the preset standby duration can be set as 10 minutes.

[0101] When the standby duration is greater than the preset standby duration, it indicates that the vehicle needs to be stopped for a long time, and the first power source and the second power source are both controlled to suspend power supply, so as to avoid waste of electric energy.

[0102] When the standby duration is less than or equal to the preset standby duration, it is judged whether the residual charge amount of the second power source is greater than a preset charge amount threshold.

[0103] When the residual charge amount of the second power source is greater than the preset charge amount threshold, the second power source is controlled to switch to a single power source power supply mode and the first power source is suspended.

[0104] When the residual charge amount of the second power source is less than or equal to the preset charge amount threshold, the first power source is controlled to switch to a single power source power supply mode and the second power source is suspended.

[0105] Specifically, according to the amount of the residual charge amount of the second power source, the second power source energy is preferentially used, and the first power source is used only when the residual charge amount of the second power source is less than or equal to the preset charge amount threshold. On the basis of the first power source being a new energy source, the effect of energy saving and emission reduction is further optimized.

[0106] In an optional embodiment of the present application, the energy management method of the hybrid electric drive heavy load vehicle further comprises:

[0107] When the first power source switches to a single power source power supply mode or the second power source switches to a single power source power supply mode, at this time, the demand of the vehicle for power is not large, and after judgment, a suitable single power source can meet the demand, therefore, in the single power source power supply mode, the torque instruction is directly determined according to the output power of the first power source or the output power of the second power source.

[0108] The torque instruction is sent to the motor of the vehicle, so as to control the motor to drive the vehicle to run, which belongs to a normal motor control mechanism.

[0109] In an optional embodiment of the present application, the energy management method of the hybrid electric drive heavy load vehicle further comprises:

[0110] When the vehicle state is in the unloading state or the charged non-starting state, the second power source is controlled to switch to a single power source power supply mode and the first power source is suspended.

[0111] and when the vehicle state is in a running idle state, controlling the second power source to switch to a single power source power supply mode and the first power source to suspend power supply.

[0112] Specifically, when the vehicle is in the unloading state, the charged non-starting state or the running idle state, only some electronic components need to be powered on, for example, in the unloading state, only the control valve and other components in the hydraulic system need to be powered on; in the charged non-starting state, some electronic devices need to be powered on, such as a music player and a display screen; in the running idle state, no power needs to be output, and the vehicle can continue to move forward only by inertia, and the electronic components and control devices need to be powered on. Therefore, the above three states consume less power, and in the state of controlling the second power source to reserve some emergency power (i.e., the preset charge threshold), the part of the power can be used at this time.

[0113] In summary, the energy management strategy of the hybrid electric drive vehicle is summarized in the energy management strategy table as shown in Table 1 below.

[0114] Table 1 Energy management strategy table

[0115]

[0116] The running conditions in the table correspond to various states of the vehicle, wherein the pure electric working state corresponds to the charged non-starting state, the empty load running corresponds to the light load or empty load running state, the heavy load running corresponds to the heavy load running state, the unloading condition corresponds to the unloading state, the standby condition corresponds to the standby state, the electric braking mode corresponds to the braking state, and the loading condition (from starting to idle) corresponds to the running idle state. In addition, in the table, represents that the corresponding power source is not used and the power supply is suspended; represents that the corresponding power source is used, i.e., the vehicle is powered, the control threshold in the table is the preset charge threshold, the lithium battery SOC is the remaining charge of the second power source, and "arbitrary" in the column of the lithium battery SOC indicates that the amount of the lithium battery SOC does not need to be considered in the corresponding row of the vehicle state, and the first power source and the second power source management strategy in the corresponding row is directly executed. In the note, "second power source charging" in the row of the electric braking mode is used to prompt that in this mode, represents that the second power source is used, but it means that the second power source is charged; "according to power demand" in the note column represents a dual power source hybrid power supply mode, and the output power of the two power sources is adjusted and distributed according to demand.

[0117] In an optional embodiment of the present application, as Figure 5 The present application also provides an energy management system of a hybrid electric drive vehicle, comprising:

[0118] An information acquisition module is configured to acquire vehicle operation information of the vehicle and a residual charge amount of the second power source, wherein the vehicle operation information comprises a vehicle state, a vehicle load and a vehicle operation slope.

[0119] A vehicle working condition monitoring module is configured to determine whether the vehicle is in a starting stage when the vehicle state is in a normal driving state and the vehicle load is greater than a first load threshold.

[0120] A power source control module is configured to control the first power source and the second power source to switch to a dual-power hybrid power supply mode to simultaneously supply power to the drive motor of the vehicle when the vehicle is in the starting stage.

[0121] The vehicle working condition monitoring module is further configured to analyze the vehicle operation slope when the vehicle is not in the starting stage.

[0122] The power source control module is further configured to control the first power source and the second power source to switch to the dual-power hybrid power supply mode when the vehicle operation slope is greater than zero, to control the power supply mode of the first power source and the second power source according to the residual charge amount of the second power source when the vehicle operation slope is less than or equal to zero, and to control the first power source to suspend power supply and the second power source to switch to a braking charging mode when the vehicle state is in a braking state.

[0123] The energy management system of the hybrid electric drive vehicle can fully recycle braking energy, when the vehicle is in an electric braking condition, the first traction motor M1 and the second traction motor M2 are in the generator operation state, the kinetic energy of the vehicle braking is converted into electric energy and fed back to the energy storage unit, the TCU controls the second conversion unit to distribute the braking energy in the energy storage unit to the second power source, i.e., the feedback energy is used to charge the second power source, the braking energy of the vehicle is recycled and stored, the electric braking requirement of the vehicle is met, the braking feedback energy is maximally recycled and stored, in the driving state, the above energy management strategy is used to preferentially use the part of energy, thereby reducing the hydrogen fuel consumption of the vehicle, saving energy and operation cost, and reducing pollution.

[0124] Although the present application is disclosed as above, the present application is not limited to this. Any person skilled in the art, without departing from the spirit and scope of the present application, can make various changes and modifications, therefore the protection scope of the present application should be defined by the scope of the claims.

Claims

1. An energy management method for a hybrid electric drive heavy duty vehicle, characterized in that, The method comprises: acquiring vehicle running information of a vehicle and a remaining charge amount of a second power source, wherein the vehicle running information comprises a vehicle state, a vehicle load and a vehicle running slope; when the vehicle state is in a normal driving state and the vehicle load is less than or equal to a first weight threshold, determining whether the remaining charge amount of the second power source is greater than a preset charge amount threshold; when the remaining charge amount of the second power source is greater than the preset charge amount threshold, controlling the second power source to switch to a single-power-source power supply mode and the first power source to suspend power supply; when the remaining charge amount of the second power source is less than or equal to the preset charge amount threshold, controlling the first power source to switch to a single-power-source power supply mode and the second power source to suspend power supply; when the vehicle state is in a normal driving state and the vehicle load is greater than the first weight threshold, determining whether the vehicle is in a starting stage; when the vehicle is in the starting stage, controlling the first power source and the second power source to switch to a dual-power-source hybrid power supply mode to simultaneously supply power to a drive motor of the vehicle, wherein the first power source is a hydrogen fuel power source and the second power source is a lithium battery power source; when the vehicle is not in the starting stage, analyzing the vehicle running slope; when the vehicle running slope is greater than zero, controlling the first power source and the second power source to switch to the dual-power-source hybrid power supply mode; when the vehicle running slope is less than or equal to zero, controlling the power supply mode of the first power source and the second power source according to the remaining charge amount of the second power source, comprising: when the vehicle running slope is less than or equal to zero, determining whether the remaining charge amount of the second power source is greater than a preset charge amount threshold; when the remaining charge amount of the second power source is greater than the preset charge amount threshold, controlling the first power source and the second power source to switch to the dual-power-source hybrid power supply mode; and when the remaining charge amount of the second power source is less than or equal to the preset charge amount threshold, controlling the first power source to switch to the single-power-source power supply mode and the second power source to suspend power supply; when the vehicle state is in a braking state, controlling the first power source to suspend power supply and the second power source to switch to a braking charging mode.

2. The energy management method for a hybrid electric drive heavy duty vehicle of claim 1, wherein, When the first power source and the second power source switch to the dual-power-source hybrid power supply mode, the energy management method of the hybrid electric drive heavy-duty vehicle comprises: determining a required power of the vehicle according to the vehicle running information; determining whether the output power of the first power source is less than the required power; when the output power of the first power source is greater than or equal to the required power, controlling the first power source to supply power and the second power source to be in a standby state; when the output power of the first power source is less than the required power, determining a supplementary power of the second power source according to the required power and the output power of the first power source; controlling the first power source and the second power source to simultaneously supply power according to the output power of the first power source and the supplementary power.

3. The energy management method for a hybrid electric drive heavy duty vehicle of claim 2, wherein, The controlling the first power source and the second power source to supply power simultaneously according to the output power of the first power source and the supplementary power comprises: determining whether the output power corresponding to the residual charge amount of the second power source is greater than the supplementary power; when the output power corresponding to the residual charge amount of the second power source is greater than the supplementary power, controlling the output power of the first power source to be unchanged and the power output by the second power source to be the supplementary power; when the output power corresponding to the residual charge amount of the second power source is less than or equal to the supplementary power, controlling the output power of the first power source to be increased and the supplementary power to be updated until the output power corresponding to the residual charge amount of the second power source is greater than the updated supplementary power, controlling the output power of the first power source to be the increased power and the power output by the second power source to be the updated supplementary power.

4. The energy management method for a hybrid electric drive heavy duty vehicle of claim 1, wherein, Further comprising: when the vehicle state is in the standby state, determining whether the standby duration of the vehicle is greater than a preset standby duration; when the standby duration is greater than the preset standby duration, controlling the first power source and the second power source to suspend power supply; when the standby duration is less than or equal to the preset standby duration, determining whether the residual charge amount of the second power source is greater than a preset charge amount threshold; when the residual charge amount of the second power source is greater than the preset charge amount threshold, controlling the second power source to switch to the single power source power supply mode and the first power source to suspend power supply; when the residual charge amount of the second power source is less than or equal to the preset charge amount threshold, controlling the first power source to switch to the single power source power supply mode and the second power source to suspend power supply.

5. The energy management method for a hybrid electric drive heavy duty vehicle of claim 1, wherein, Further comprising: when the vehicle state is in the unloading state or the charged and unstarted state, controlling the second power source to switch to the single power source power supply mode and the first power source to suspend power supply.

6. The energy management method for a hybrid electric drive heavy duty vehicle of claim 1, wherein, Further comprising: when the vehicle state is in the running idle state, controlling the second power source to switch to the single power source power supply mode and the first power source to suspend power supply.

7. The energy management method for a hybrid electric drive heavy duty vehicle of any one of claims 1-6, characterized in that, Further comprising: when the first power source switches to the single power source power supply mode or the second power source switches to the single power source power supply mode, determining a torque instruction according to the output power of the first power source or the output power of the second power source; sending the torque instruction to the motor of the vehicle to control the motor to drive the vehicle to run.

8. An energy management system for a hybrid electric drive vehicle, characterized by Comprising: an information acquisition module, configured to acquire vehicle running information of a vehicle and a residual charge amount of a second power source, wherein the vehicle running information comprises a vehicle state, a vehicle load and a vehicle running slope; a vehicle working condition monitoring module, configured to, when the vehicle state is in a normal running state and the vehicle load is less than or equal to a first weight threshold, determine whether the residual charge amount of the second power source is greater than a preset charge amount threshold, and further configured to, when the vehicle state is in the normal running state and the vehicle load is greater than the first weight threshold, determine whether the vehicle is in a starting stage; The power source control module is configured to control the second power source to switch to a single-power-source power supply mode and the first power source to suspend power supply when the remaining charge amount of the second power source is greater than the preset charge amount threshold; control the first power source to switch to a single-power-source power supply mode and the second power source to suspend power supply when the remaining charge amount of the second power source is less than or equal to the preset charge amount threshold; and control the first power source and the second power source to switch to a dual-power-source hybrid power supply mode to simultaneously supply power to the drive motor of the vehicle when the vehicle is in a starting stage, wherein the first power source is a hydrogen fuel power source, and the second power source is a lithium battery power source. The vehicle working condition monitoring module is further configured to analyze a running slope of the vehicle when the vehicle is not in the starting stage. The power source control module is further configured to control the first power source and the second power source to switch to the dual-power-source hybrid power supply mode when the running slope of the vehicle is greater than zero; and control the power supply modes of the first power source and the second power source according to the remaining charge amount of the second power source when the running slope of the vehicle is less than or equal to zero, specifically configured to determine whether the remaining charge amount of the second power source is greater than a preset charge amount threshold when the running slope of the vehicle is less than or equal to zero; control the first power source and the second power source to switch to the dual-power-source hybrid power supply mode when the remaining charge amount of the second power source is greater than the preset charge amount threshold; control the first power source to switch to the single-power-source power supply mode and the second power source to suspend power supply when the remaining charge amount of the second power source is less than or equal to the preset charge amount threshold; and control the first power source to suspend power supply and the second power source to switch to a braking charging mode when the vehicle state is in a braking state.

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