Auxiliary braking system and method and vehicle

Abstract

The invention provides an auxiliary braking system and method and a vehicle, the system comprises a retarding device and a control device, the retarding device is arranged in a range extender of the vehicle, and a range extending engine in the range extender, the retarding device and a range extending generator in the range extender are sequentially connected in series; the control device is used for obtaining the current charge state of a power battery of the vehicle in the process that a driving motor of the vehicle recovers braking energy and controlling starting and stopping of the retarding device based on the current charge state of the power battery, and the retarding device is used for consuming electric energy recovered by the driving motor under driving of the range extending generator when the retarding device is started. When the retarding device is controlled to be started and stopped based on the charge state of the power battery, the electric energy recycled by the driving motor can be consumed through the retarding device under the condition that the power battery is fully charged or nearly fully charged and the like and is not suitable for receiving the recycled electric energy, so that the driving motor can be ensured to effectively recycle the braking energy; and the safety of the vehicle in the braking process is improved.

Description

Technical Field

[0001] The present application relates to the field of vehicles, and in particular to an auxiliary braking system, method and vehicle. Background Art

[0002] Auxiliary braking through a retarder has significant advantages in direct-drive vehicles such as commercial vehicles and heavy machinery. Especially in long downhill slopes, frequent braking or high-load conditions, auxiliary braking through a retarder can effectively improve vehicle safety.

[0003] Currently, traditional retarders are typically deployed in series or parallel on direct-drive vehicles, intercepting or partially offsetting the power transmitted from the drive shaft to provide auxiliary braking. However, such retarders cannot be deployed on extended-range vehicles, posing a significant safety risk when braking energy cannot be recovered due to factors such as a fully charged power battery. Summary of the Invention

[0004] In order to solve the above technical problems, the present application provides an auxiliary braking system, method and vehicle to solve the problem in the existing technology that extended-range vehicles cannot recover braking energy due to reasons such as full power battery charge, which poses a high safety risk.

[0005] To achieve the above technical objectives, the embodiments of the present application provide the following technical solutions:

[0006] In a first aspect, embodiments of the present specification provide an auxiliary braking system for a vehicle, the vehicle including a range extender, the auxiliary braking system including a retarder and a control device, the retarder being disposed on the range extender, the range extender engine in the range extender, the retarder, and the range extender generator in the range extender being connected in series in sequence;

[0007] The control device is connected to the retarding device and is used to obtain the current state of charge of the power battery of the vehicle during the process of the driving motor of the vehicle performing brake energy recovery, and control the opening and closing of the retarding device based on the current state of charge of the power battery;

[0008] The retarder is used to consume the electric energy recovered by the drive motor under the drive of the range extender generator when it is turned on.

[0009] In one embodiment, the drive motor is connected to the range extender and the power battery via an electric energy conversion device, and the control device is connected to the electric energy conversion device;

[0010] The control device is specifically used for:

[0011] Based on the magnitude relationship between the current state of charge of the power battery and the preset state of charge, control the power conversion device to transmit the electric energy recovered by the drive motor to the power battery and / or the range extender, and control the opening and closing of the retarder.

[0012] In one embodiment, the control device is specifically configured to:

[0013] When the current state of charge of the power battery is greater than the preset state of charge, control the power conversion device to transmit at least part of the electric energy recovered by the drive motor to the range extender, and control the retarder to be turned on.

[0014] In one embodiment, the control device is further configured to:

[0015] When controlling the retarder to be turned on, determine the target speed of the range extender generator based on the electric energy transmitted by the power conversion device to the range extender;

[0016] Based on the target speed, control the range extender generator to rotate, and the range extender generator is used to drive the retarder and the range extender engine to rotate during the rotation process.

[0017] In one embodiment, the control device is specifically configured to:

[0018] Based on the electric energy transmitted by the power conversion device to the range extender, determine the candidate speed of the retarder;

[0019] Based on the candidate speed of the retarder and the upper and lower speed limit values of the range extender engine, determine the target speed of the range extender generator.

[0020] In one embodiment, the control device is specifically configured to:

[0021] Based on the coolant temperature in the cooling device of the range extender engine, determine the lower speed limit value of the range extender engine, wherein the range extender engine is used to drive the pumping device in the cooling device to operate during the rotation process.

[0022] In one embodiment, the control device is specifically configured to:

[0023] When the current state of charge of the power battery is less than or equal to the preset state of charge, control the power conversion device to transmit the electric energy recovered by the drive motor to the power battery, and control the retarder to be turned off.

[0024] In one embodiment, the control device is further configured to:

[0025] Determine the maximum recoverable electric energy of the drive motor based on the maximum consumable electric energy of the retarder and the current state of charge of the power battery.

[0026] Adjust the braking ratio of the drive motor and the mechanical braking device of the vehicle based on the maximum recoverable electric energy of the drive motor.

[0027] In a second aspect, an auxiliary braking method provided by an embodiment of this specification is applied to the auxiliary braking system as described in any one of the above. The method includes:

[0028] During the process of the drive motor of the vehicle performing braking energy recovery, obtain the current state of charge of the power battery of the vehicle.

[0029] Control the opening and closing of the retarder based on the current state of charge of the power battery.

[0030] In a third aspect, an embodiment of this specification provides a vehicle, which includes a range extender, a drive motor, a power battery, and the auxiliary braking system as described above.

[0031] In a fourth aspect, an embodiment of this specification provides an electronic device, which includes at least one processor and at least one memory. A computer program is stored in the memory, and when the computer program is executed by the processor, the auxiliary braking method as described above is implemented.

[0032] In a fifth aspect, an embodiment of this specification provides a computer-readable storage medium, on which a computer program is stored. When the computer program is run by a processor, the auxiliary braking method as described above is implemented.

[0033] In a sixth aspect, an embodiment of this specification provides a computer program product or a computer program. The computer program product includes a computer program, and the computer program is stored in a computer-readable storage medium; a processor of the computer device reads the computer program from the computer-readable storage medium, and when the processor executes the computer program, the auxiliary braking method as described above is implemented.

[0034] As can be seen from the above technical solution, the embodiments of the present application provide an auxiliary braking system, method and vehicle. The system includes a retarder and a control device. The retarder is arranged in the range extender of the vehicle. The range extender engine, the retarder and the range extender generator in the range extender are serially connected in sequence. The control device is connected to the retarder and is used to obtain the current state of charge of the vehicle's power battery during the process of the driving motor of the vehicle performing braking energy recovery, and control the opening and closing of the retarder based on the current state of charge of the power battery. The retarder is used to consume the electric energy recovered by the driving motor under the drive of the range extender generator when it is turned on. Thus, during the process of controlling the opening and closing of the retarder based on the state of charge of the power battery, when the power battery is fully charged or nearly fully charged and not suitable for receiving recovered electric energy, the retarder can be used to consume the electric energy recovered by the driving motor, thereby ensuring that the driving motor can effectively recover braking energy and improving the safety of the vehicle during braking. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the provided drawings.

[0036] Figure 1 FIG. is a schematic structural diagram of a retarder arranged on a direct drive vehicle in series in the prior art.

[0037] Figure 2 FIG. is a schematic structural diagram of a retarder arranged on a direct drive vehicle in parallel in the prior art.

[0038] Figure 3 FIG. is a schematic structural diagram of an auxiliary braking system provided by an embodiment of the present specification.

[0039] Figure 4 FIG. is a schematic flowchart of an auxiliary braking method provided by an embodiment of the present specification. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0040] Unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present specification should have the ordinary meaning understood by those of ordinary skill in the art to which the present specification belongs. The "first", "second" and similar terms used in the embodiments of the present specification do not indicate any order, quantity or importance, but are only used to avoid confusion of components.

[0041] Unless otherwise required by the context, throughout the specification, "a plurality of" means "at least two", and "comprising" is construed in an open, inclusive sense, i.e., "including, but not limited to". In the description of the specification, terms such as "one embodiment", "some embodiments", "exemplary embodiments", "examples", "specific examples", or "some examples" are intended to indicate that specific features, structures, materials, or characteristics related to the embodiment or example are included in at least one embodiment or example of this specification. The schematic representations of the above terms do not necessarily refer to the same embodiment or example.

[0042] Next, the technical solutions in the embodiments of this specification will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of this specification. Obviously, the described embodiments are only a part of the embodiments of this specification, rather than all the embodiments. Based on the embodiments in this specification, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this specification.

[0043] Overview

[0044] As described in the background art, auxiliary braking by a retarder has significant advantages in direct-drive vehicles such as commercial vehicles and heavy machinery. For example, in buses with a vehicle length greater than 9m, trucks with a gross mass ≥ 12t, and special operation vehicles, etc., especially in long downhill, frequent braking, or high-load working conditions, auxiliary braking by a retarder can effectively improve the safety of the vehicle.

[0045] Currently, traditional retarders are usually arranged on direct-drive vehicles in a series or parallel manner to cut off or partially offset the power transmitted on the drive shaft through the retarder, thereby achieving auxiliary braking of the vehicle. For example, as Figure 1 shown, when the retarder 103 is arranged on the direct-drive vehicle in a series manner, the retarder 103 can be arranged on the drive shaft 104 between the transmission 102 and the drive axle 105 of the vehicle. Among them, the power transmission route 106 of the vehicle can be that the power output by the engine 101 of the vehicle is transmitted to the drive axle 105 through the transmission 102 and the drive shaft 104 to drive the wheels. Thus, the retarder 103 connected in series on the drive shaft 104 can directly participate in the power transmission of the vehicle and directly transmit the braking torque to the vehicle to continuously provide stable braking force and reduce the risk of overheating failure of the service brake (brake pads). As Figure 2As shown, when the retarder 103 is arranged on a direct-drive vehicle in a parallel connection manner, the retarder 103 can be connected to the housing of the transmission 102 through a flange or the like. At the same time, the input shaft of the retarder 103 is connected to the output shaft of the transmission 102 through a gear or other connecting parts, so as to transmit the braking torque to the vehicle through the connecting parts. Thus, the retarder 103 connected in parallel with the drive shaft 104 can partially offset the power transmitted on the drive shaft 104, so as to continuously provide stable braking force and reduce the risk of overheating failure of the service brake (brake pads).

[0046] However, in a range-extended vehicle, the range extender does not directly participate in the driving of the vehicle, resulting in the inability to arrange the retarder in the range-extended vehicle. Thus, when the braking energy cannot be recovered due to reasons such as the power battery being fully charged, there will be a relatively high safety risk.

[0047] To solve the problem that there is a relatively high safety risk in the traditional method when the braking energy cannot be recovered due to reasons such as the power battery being fully charged in a range-extended vehicle, in the technical solution of this application, an auxiliary braking system, method and vehicle are provided. The system includes a retardation device and a control device. The retardation device is arranged in the range extender of the vehicle. The range extender engine, the retardation device and the range extender generator in the range extender are connected in series in sequence. The control device is connected to the retardation device and is used to obtain the current state of charge of the power battery of the vehicle during the process of the driving motor of the vehicle recovering braking energy, and control the opening and closing of the retardation device based on the current state of charge of the power battery. The retardation device is used to consume the electric energy recovered by the driving motor under the drive of the range extender generator when it is turned on. Thus, during the process of controlling the opening and closing of the retardation device based on the state of charge of the power battery, when the power battery is fully charged or nearly fully charged and other situations where the power battery is not suitable for receiving the recovered electric energy, the retardation device can consume the electric energy recovered by the driving motor, so as to effectively ensure the recovery of the braking energy by the driving motor and improve the safety of the vehicle during the braking process.

[0048] Based on the above inventive concept, the auxiliary braking system provided by the embodiments of this specification will be described exemplarily below.

[0049] Exemplary System

[0050] The embodiments of this specification provide an auxiliary braking system, which is applied to a vehicle. The vehicle includes a range extender, as Figure 3 shown, the auxiliary braking system includes a retardation device 301 and a control device ( Figure 3 not shown in the figure). The retardation device 301 is arranged in the range extender. The range extender engine 302, the retardation device 301 and the range extender generator 303 in the range extender are connected in series in sequence;

[0051] The control device is connected to the retarder 301 and is configured to obtain the current state of charge of the vehicle's power battery during the process of the drive motor of the vehicle performing braking energy recovery, and control the opening and closing of the retarder 301 based on the current state of charge of the power battery;

[0052] The retarder 301 is configured to consume the electric energy recovered by the drive motor under the drive of the range extender generator 303 when it is turned on.

[0053] Specifically, the vehicle can be a range-extended vehicle, that is, it includes a range extender, a power battery, and a drive motor. The range extender includes a range-extended engine 302 and a range extender generator 303. The range-extended engine 302 is configured to generate mechanical energy through fuel combustion and transmit the mechanical energy to the range extender generator 303. The range extender generator 303 is configured to convert the mechanical energy generated by the range-extended engine 302 into electric energy to charge the power battery with the electric energy generated by the range extender generator 303. The power battery can supply power to the drive motor to drive the vehicle to travel through the drive motor. At the same time, the drive motor can also become a generator during the braking process of the vehicle to perform braking energy recovery to achieve regenerative braking and store the recovered electric energy in the power battery.

[0054] In implementation, the auxiliary braking system includes a retarder 301 and a control device. The retarder 301 is connected to the control device. For example, the retarder 301 can be electrically connected to the control device to control the retarder 301 through the control device. For example, the control device can control the opening and closing of the retarder 301 and can also control the retarder 301 to perform gear adjustment.

[0055] The retarder 301 can adopt a hydraulic retarder, a turbine retarder, etc., which are retarders that directly utilize the vehicle's own energy to work. They do not require external energy drive, have a simple structure, and are easy to maintain, thus greatly reducing the cost of the auxiliary braking system and reducing the requirement for the layout space. Preferably, the retarder 301 can adopt a hydraulic retarder. The control device can be a newly added controller or an existing controller in the vehicle, such as a vehicle controller.

[0056] Among them, the retarder 301 can be integrated inside the range extender. The range extender engine 302, the retarder 301, and the range extender generator 303 are connected in series in sequence. For example, one end of the retarder 301 can be rigidly connected to the output shaft of the range extender engine 302, and the other end of the retarder 301 can be rigidly connected to the range extender generator 303 through a spline shaft. It can be understood that when a motor torsional damper 304 is provided in the range extender, the range extender generator 303 can be rigidly connected to the motor torsional damper 304 through a spline shaft, and at the same time, the motor torsional damper 304 can always be attached to the retarder 301 through a pressing device. Thus, during the process that the drive motor becomes a generator for braking energy recovery, the range extender generator 303 can become a drive motor to drive the retarder 301 and the range extender engine 302 to rotate through the range extender generator 303, and further consume the electric energy recovered by the drive motor through the retarder 301 and the range extender engine 302.

[0057] When the retarder 301 is turned on, it can consume the electric energy recovered by the drive motor under the drive of the range extender generator 303. For example, part or all of the electric energy recovered by the drive motor can be used to drive the range extender generator 303 to rotate, so as to drive the retarder 301 and the range extender engine 302 to rotate through the range extender generator 303, and consume the electric energy recovered by the drive motor. For example, during the process that the retarder 301 rotates driven by the range extender generator 303, a medium (the medium of the hydraulic retarder can be oil, and the medium of the turbine retarder can be gas) flows between the rotor and the turbine to generate resistance, so as to consume the electric energy transmitted to the range extender by the electric energy conversion device. In addition, during the rotation process of the range extender engine 302, frictional losses can be generated to consume the electric energy recovered by the drive motor. It can be understood that during the process of consuming the electric energy recovered by the drive motor through the retarder 301 and the range extender engine 302, the retarder 301 plays a leading role.

[0058] The control device can be used to obtain the current state of charge of the power battery during the process that the drive motor of the vehicle performs braking energy recovery, and based on the current state of charge of the power battery, control the opening and closing of the retarder 301. For example, when the current state of charge of the power battery indicates that the power battery is fully charged or nearly fully charged and other states that are not suitable for receiving the electric energy recovered by the drive motor, the control device can control the retarder 301 to turn on, so as to consume the electric energy recovered by the drive motor through the retarder 301, thereby ensuring that the drive motor can effectively perform braking energy recovery and improving the safety of the vehicle during braking.

[0059] In addition, when the current state of charge of the power battery indicates that the power battery is in a state capable of receiving the electric energy recovered by the drive motor, the control device can control the retarder 301 to close, so as to fully utilize the braking energy, thereby effectively improving the vehicle's cruising range and reducing the vehicle's electricity cost.

[0060] In a feasible implementation, the drive motor is connected to the range extender and the power battery through an electric energy conversion device, and the control device is connected to the electric energy conversion device;

[0061] The control device is specifically configured to:

[0062] Based on the magnitude relationship between the current state of charge of the power battery and the preset state of charge, control the electric energy conversion device to transmit the electric energy recovered by the drive motor to the power battery and / or the range extender, and control the opening and closing of the retarder 301.

[0063] Specifically, the drive motor can be connected to the range extender and the power battery through an electric energy conversion device, so as to convert the electric energy recovered by the drive motor through the electric energy conversion device and then output it to the power battery and / or the range extender. At the same time, the control device can also be electrically connected to the electric energy conversion device to control the electric energy conversion device to transmit the electric energy recovered by the drive motor to the power battery and / or the range extender through the control device.

[0064] In implementation, the control device can control the electric energy conversion device to transmit the electric energy recovered by the drive motor to the power battery and / or the range extender according to the magnitude relationship between the current state of charge of the power battery and the preset state of charge, and at the same time, control the opening and closing of the retarder 301.

[0065] For example, when the control device determines, according to the magnitude relationship between the current state of charge of the power battery and the preset state of charge, that the power battery is in a state capable of receiving the electric energy recovered by the drive motor, it can control the electric energy conversion device to preferentially transmit the electric energy recovered by the drive motor to the power battery and transmit the excess electric energy to the range extender, so as to fully utilize the braking energy, thereby effectively improving the vehicle's cruising range and reducing the vehicle's electricity cost.

[0066] In addition, when the control device determines, according to the magnitude relationship between the current state of charge of the power battery and the preset state of charge, that the power battery is in a state such as fully charged or nearly fully charged and not suitable for receiving the electric energy recovered by the drive motor, it can control the electric energy conversion device to transmit at least part of the electric energy recovered by the power battery to the range extender, so as to consume the electric energy recovered by the drive motor through the retarder 301, thereby improving the braking energy recovery ability of the drive motor.

[0067] Meanwhile, when the control device controls the power conversion device to transmit part or all of the electric energy recovered by the drive motor to the range extender, it can control the retarder 301 to turn on, so as to consume the electric energy recovered by the drive motor through the retarder 301, ensuring the braking energy recovery ability of the drive motor; in addition, when the drive motor does not perform braking energy recovery or the electric energy transmitted by the power conversion device to the range extender is 0, the control device can control the retarder 301 to turn off to ensure the normal operation of the range extender.

[0068] Thus, through the method of the embodiment of the present application, it is possible to ensure that the drive motor effectively recovers braking energy on the premise of ensuring the full utilization of braking energy, further improving the safety of the vehicle during braking.

[0069] In a feasible implementation manner, the control device is specifically configured to:

[0070] When the current state of charge of the power battery is greater than the preset state of charge, control the power conversion device to transmit at least part of the electric energy recovered by the drive motor to the range extender, and control the retarder 301 to turn on.

[0071] Specifically, when the current state of charge of the power battery is greater than the preset state of charge, it indicates that the power battery is in a state where it is not suitable to receive the electric energy recovered by the drive motor, such as being fully charged or nearly fully charged. At this time, the power conversion device can be controlled to transmit at least part of the electric energy recovered by the drive motor to the range extender, and the retarder 301 can be controlled to turn on, so that the retarder 301 rotates under the drive of the range extender generator 303 and consumes the electric energy transmitted by the power conversion device to the range extender, thereby effectively ensuring the braking energy recovery ability of the drive motor and further improving the safety of the vehicle during braking.

[0072] It can be understood that the control device can also control the power conversion device to feed back at least part of the electric energy recovered by the drive motor to the power grid when the current state of charge of the power battery is greater than the preset state of charge, so as to improve the utilization rate of the electric energy recovered by the drive motor.

[0073] Meanwhile, the control device can also control the power conversion device to transmit at least part of the electric energy recovered by the drive motor to in-vehicle electronic devices when the current state of charge of the power battery is greater than the preset state of charge, so as to supply power to the in-vehicle electronic devices with the electric energy recovered by the drive motor, reduce the power consumption of the low-voltage battery of the vehicle, and improve the utilization rate of the electric energy recovered by the drive motor.

[0074] In addition, a super capacitor can be provided on the vehicle, and when the current state of charge of the power battery is greater than a preset state of charge, the control device can also control the power conversion device to transmit at least part of the electric energy recovered by the drive motor to the super capacitor, so as to charge the super capacitor with the electric energy recovered by the drive motor. Thus, in high-power demand scenarios such as vehicle acceleration, the super capacitor can quickly release electric energy to meet the power demand of the vehicle, thereby improving the operating performance of the vehicle.

[0075] It should be noted that the priority of transmitting the electric energy recovered by the drive motor to the power battery is higher than the priority of transmitting the electric energy recovered by the drive motor to the power grid, in-vehicle electronic devices, and the super capacitor. At the same time, the priority of transmitting the electric energy recovered by the drive motor to the power grid, in-vehicle electronic devices, and the super capacitor is higher than the priority of transmitting the electric energy recovered by the drive motor to the range extender, so as to effectively improve the utilization rate of the electric energy recovered by the drive motor while ensuring the braking energy recovery ability of the drive motor.

[0076] In a feasible implementation manner, the control device is further configured to:

[0077] When controlling the retarder 301 to be turned on, determine the target speed of the range extender generator 303 based on the electric energy transmitted by the power conversion device to the range extender;

[0078] Based on the target speed, control the range extender generator 303 to rotate, and the range extender generator 303 is configured to drive the retarder 301 and the range extender engine 302 to rotate during the rotation process.

[0079] Specifically, when the control device controls the retarder 301 to be turned on, it can determine the target speed of the range extender generator 303 based on the electric energy transmitted by the power conversion device to the range extender, and control the range extender generator 303 to rotate based on the target speed, so as to drive the retarder 301 and the range extender engine 302 to rotate during the rotation process of the range extender generator 303. Among them, when the range extender engine 302, the retarder 301, and the range extender generator 303 are connected in series, the speeds of the retarder 301 and the range extender engine 302 are the same as the speed of the range extender generator 303.

[0080] In practice, the electric energy transmitted by the power conversion device to the range extender can be the electric energy that needs to be transmitted by the power conversion device to the range extender determined based on the magnitude relationship between the current state of charge of the power battery and the preset state of charge.

[0081] During the process of determining the target speed of the range extender generator 303 based on the electric energy transmitted by the electric energy conversion device to the range extender, the control device can determine the candidate speeds of the retarder 301 based on the electric energy transmitted by the electric energy conversion device to the range extender, and determine the target speed of the range extender generator 303 based on the candidate speeds of the retarder 301, so as to ensure that the retarder 301 effectively consumes the electric energy transmitted by the electric energy conversion device to the range extender, and further improve the safety of the vehicle during braking.

[0082] In a feasible implementation manner, the control device is specifically configured to:

[0083] Determine the candidate speeds of the retarder 301 based on the electric energy transmitted by the electric energy conversion device to the range extender;

[0084] Determine the target speed of the range extender generator 303 based on the candidate speeds of the retarder 301, and the upper speed limit value and the lower speed limit value of the range extender engine 302.

[0085] Specifically, the candidate speeds of the retarder 301 may include the candidate speeds of the retarder 301 in at least two different gears. In implementation, the control device may determine the candidate speeds of the retarder 301 in each gear based on the electric energy transmitted by the electric energy conversion device to the range extender and the target correspondence relationship, and the target correspondence relationship may include the correspondence relationship between the gear, speed, and consumed electric energy of the retarder 301.

[0086] Among them, the control device may determine the target speed of the range extender generator 303 based on the candidate speeds of the retarder 301 in each gear, and the upper speed limit value and the lower speed limit value of the range extender engine 302. Optionally, the target speed of the range extender generator 303 may be determined based on the magnitude relationship between the candidate speeds of the retarder 301 in each gear and the upper speed limit value and the lower speed limit value of the range extender engine 302. For example, any candidate speed among the candidate speeds of the retarder 301 in each gear that is between the upper speed limit value and the lower speed limit value of the range extender engine 302 may be used as the target speed of the range extender generator 303.

[0087] Among them, the upper speed limit value of the range extender engine 302 may be the maximum speed of the range extender engine 302 set in advance, or may also be the maximum speed of the range extender engine 302 determined according to the current state of the range extender engine 302 (such as, the fault state).

[0088] In addition, the lower limit value of the rotational speed of the range extender engine 302 can be 0, or it can be determined according to the required rotational speed of the range extender engine 302. For example, when the range extender engine 302 drives the pumping device in the cooling device to operate, the required rotational speed of the range extender engine 302 can be determined based on the coolant temperature in the pumping device, and this required rotational speed can be used as the lower limit value of the rotational speed of the range extender engine 302.

[0089] Therefore, through the method of the embodiment of the present application, while ensuring that the retarder 301 effectively consumes the electric energy transmitted from the electric energy conversion device to the range extender, the safe and reliable operation of the range extender engine 302 can be ensured.

[0090] In a feasible implementation manner, the control device is specifically configured to:

[0091] Determine the lower limit value of the rotational speed of the range extender engine 302 based on the coolant temperature in the cooling device of the range extender engine 302, where the range extender engine 302 is used to drive the pumping device in the cooling device to operate during rotation.

[0092] Specifically, the cooling device of the range extender engine 302 can be used to cool down the range extender engine 302, and at the same time, it can also be used to cool down the retarder 301 to ensure the safe and reliable operation of the range extender engine 302 and the retarder 301. Among them, during the process of driving the retarder 301 and the range extender engine 302 to rotate by the range extender generator 303 to consume the electric energy transmitted from the electric energy conversion device to the range extender, the range extender engine 302 and the retarder 301 can be cooled by the cooling device of the range extender engine 302. As a result, the temperature of the coolant in the cooling device will rise.

[0093] In practice, when the range extender engine 302 drives the pumping device in the cooling device to operate, the lower limit value of the rotational speed of the range extender engine 302 can be determined based on the coolant temperature in the cooling device of the range extender engine 302. Optionally, during the process of driving the retarder 301 and the range extender engine 302 to rotate by the range extender generator 303, the temperature detection device can be used to detect the coolant temperature in the cooling device in real time, and the lower limit value of the rotational speed of the range extender engine 302 can be dynamically updated based on the coolant temperature. For example, the current required rotational speed of the pumping device can be determined based on the current temperature of the coolant and the target temperature of the coolant, and the current required rotational speed of the pumping device can be used as the lower limit value of the rotational speed of the range extender engine 302.

[0094] It can be understood that when the pumping device in the cooling device of the range extender engine 302 is an electric water pump, that is, there is no need for the range extender engine 302 to drive the pumping device to operate, the lower limit value of the rotational speed of the range extender engine 302 can be 0. At this time, the control device can also control the operation of the pumping device based on the current required rotational speed of the pumping device to ensure that the temperature of the coolant meets the cooling requirements of the range extender engine 302 and the retarder 301. Furthermore, during the process of consuming the electric energy transmitted by the electric energy conversion device to the range extender through the range extender engine 302 and the retarder 301, the safe and reliable operation of the range extender engine 302 and the retarder 301 can be ensured.

[0095] Thus, through the retarder 301 and the range extender engine 302, the electric energy transmitted by the electric energy conversion device to the range extender can be effectively consumed, and further, the driving motor can be effectively used to recover braking energy, improving the safety of the vehicle during braking.

[0096] In a feasible implementation manner, the control device is specifically configured to:

[0097] When the current state of charge of the power battery is less than or equal to the preset state of charge, control the electric energy conversion device to transmit the electric energy recovered by the driving motor to the power battery, and control the retarder 301 to be turned off.

[0098] Specifically, when the current state of charge of the power battery is less than or equal to the preset state of charge, it indicates that the power battery is in a state capable of receiving the electric energy recovered by the driving motor. At this time, the electric energy conversion device can be controlled to transmit the electric energy recovered by the driving motor to the power battery, and the retarder 301 can be controlled to be turned off to charge the power battery with the electric energy recovered by the driving motor, thereby enabling the full utilization of braking energy, effectively increasing the cruising range of the vehicle, and reducing the power consumption cost of the vehicle.

[0099] In a feasible implementation manner, the control device is further configured to:

[0100] Based on the maximum consumable electric energy of the retarder 301 and the current state of charge of the power battery, determine the maximum recoverable electric energy of the driving motor;

[0101] Based on the maximum recoverable electric energy of the driving motor, adjust the braking ratio between the driving motor and the mechanical braking device of the vehicle.

[0102] Specifically, the maximum consumable electric energy of the retarder 301 can be the electric energy that the retarder 301 can consume when the rotational speed of the range extender generator 303 reaches the upper limit value of the rotational speed of the range extender engine 302 and the gear of the retarder 301 is at the highest gear. Among them, the maximum consumable electric energy of the retarder 301 can be determined based on the corresponding relationship among the gear, rotational speed, and consumed electric energy of the retarder 301.

[0103] Meanwhile, the target charging power of the power battery can be determined based on the current state of charge of the power battery. For example, the required charging power of the power battery in the current state of charge can be determined based on the current state of charge of the power battery and the preset corresponding relationship between the state of charge of the power battery and the required charging power of the power battery, and the required charging power of the power battery in the current state of charge can be used as the target charging power of the power battery. Among them, the required charging power of the power battery can be negatively correlated with the state of charge of the power battery, that is, the lower the state of charge of the power battery, the greater its required charging power to accelerate the charging speed, and the higher the state of charge of the power battery, the smaller its required charging power to prevent overcharging of the power battery and extend the service life of the power battery.

[0104] In implementation, the control device can also determine the maximum recoverable electric energy of the drive motor based on the sum of the maximum consumable electric energy of the retarder 301 and the target charging power of the power battery. For example, in the case where the electric energy recovered by the drive motor is only used for charging the power battery, the sum of the maximum consumable electric energy of the retarder 301 and the target charging power of the power battery can be used as the maximum recoverable electric energy of the drive motor. Additionally, the sum of the maximum consumable electric energy of the retarder 301 and the target charging power of the power battery can be compensated based on a preset compensation value, and the compensation result can be used as the maximum recoverable electric energy of the drive motor.

[0105] The mechanical braking device of the vehicle can be a device that generates braking force through friction, such as brake pads or brake discs. Among them, the control device can adjust the braking ratio between the drive motor and the mechanical braking device of the vehicle based on the maximum recoverable electric energy of the drive motor. For example, the control device can determine the braking ratio between the drive motor and the mechanical braking device according to the braking ratio distribution strategy with priority given to renewable braking based on the maximum recoverable electric energy of the drive motor, so as to make full use of the drive motor to recover braking energy and greatly improve the safety of the vehicle during braking. Additionally, the control device can also determine the braking ratio between the drive motor and the mechanical braking device based on the driving condition of the vehicle and the maximum recoverable electric energy of the drive motor. For example, the braking ratio corresponding to the drive motor can be positively correlated with the vehicle speed, and the electric energy recovered by the drive motor is less than or equal to the maximum recoverable electric energy of the drive motor, so as to effectively meet the braking requirements of the vehicle while ensuring the safety of the vehicle during braking.

[0106] Exemplary method

[0107] In an exemplary embodiment of the present specification, an auxiliary braking method is further provided, which is applied to the auxiliary braking system described in any of the above embodiments, as Figure 4 shown, the method includes:

[0108] S401. During the process of the driving motor of the vehicle performing braking energy recovery, obtain the current state of charge of the power battery of the vehicle;

[0109] S402. Based on the current state of charge of the power battery, control the opening and closing of the retarder 301.

[0110] In a feasible embodiment, the controlling the opening and closing of the retarder 301 based on the current state of charge of the power battery includes:

[0111] Based on the magnitude relationship between the current state of charge of the power battery and the preset state of charge, control the power conversion device to transmit the electric energy recovered by the driving motor to the power battery and / or the range extender, and control the opening and closing of the retarder 301.

[0112] In a feasible embodiment, the controlling the power conversion device to transmit the electric energy recovered by the driving motor to the power battery and / or the range extender, and controlling the opening and closing of the retarder 301 based on the magnitude relationship between the current state of charge of the power battery and the preset state of charge includes:

[0113] When the current state of charge of the power battery is greater than the preset state of charge, control the power conversion device to transmit at least part of the electric energy recovered by the driving motor to the range extender, and control the retarder 301 to be turned on.

[0114] In a feasible embodiment, it further includes:

[0115] When controlling the retarder 301 to be turned on, determine the target speed of the range extender generator 303 based on the electric energy transmitted by the power conversion device to the range extender;

[0116] Based on the target speed, control the range extender generator 303 to rotate, and the range extender generator 303 is used to drive the retarder 301 and the range extender engine 302 to rotate during the rotation process.

[0117] In a feasible embodiment, the determining the target speed of the range extender generator 303 based on the electric energy transmitted by the power conversion device to the range extender includes:

[0118] Determine the candidate speed of the retarder 301 based on the electric energy transmitted from the electric energy conversion device to the range extender;

[0119] Based on the candidate speed of the retarder 301, as well as the upper speed limit value and the lower speed limit value of the range extender engine 302, determine the target speed of the range extender generator 303.

[0120] In a feasible implementation, the process of determining the lower speed limit value of the range extender engine 302 includes:

[0121] Determine the lower speed limit value of the range extender engine 302 based on the coolant temperature in the cooling device of the range extender engine 302, where the range extender engine 302 is used to drive the pumping device in the cooling device during rotation.

[0122] In a feasible implementation, the control of the electric energy conversion device to transmit the electric energy recovered by the drive motor to the power battery and / or the range extender, and the control of the opening and closing of the retarder 301 based on the magnitude relationship between the current state of charge of the power battery and the preset state of charge includes:

[0123] When the current state of charge of the power battery is less than or equal to the preset state of charge, control the electric energy conversion device to transmit the electric energy recovered by the drive motor to the power battery, and control the retarder 301 to close.

[0124] In a feasible implementation, it further includes:

[0125] Determine the maximum recoverable electric energy of the drive motor based on the maximum consumable electric energy of the retarder 301 and the current state of charge of the power battery;

[0126] Adjust the braking ratio of the drive motor and the mechanical braking device of the vehicle based on the maximum recoverable electric energy of the drive motor.

[0127] The auxiliary braking method provided in this embodiment belongs to the same inventive concept as the auxiliary braking system provided in the above embodiments of the present application. The control device in the auxiliary braking system can execute the auxiliary braking method provided in any of the above embodiments of the present application, and the control device has corresponding functional modules and beneficial effects for executing the auxiliary braking method. For technical details not described in detail in this embodiment, reference can be made to the specific processing content of the auxiliary braking system provided in the above embodiments of the present application, which will not be elaborated here.

[0128] Exemplary Device

[0129] In an exemplary embodiment of the present specification, an electronic device is further provided. The electronic device includes at least one processor and at least one memory. A computer program is stored in the memory, and when the computer program is executed by the processor, the auxiliary braking method described in any of the above embodiments is implemented.

[0130] Exemplary Vehicle

[0131] In an exemplary embodiment of the present specification, a vehicle is further provided. The vehicle includes a range extender, a drive motor, a power battery, and the auxiliary braking system described in any one of the above.

[0132] Exemplary computer program product and storage medium

[0133] In addition to the above methods and devices, the auxiliary braking method provided by the embodiments of the present specification may also be a computer program product, which includes computer program instructions. When the computer program instructions are run by a processor, the processor is caused to execute the steps in the auxiliary braking method according to various embodiments of the present specification described in the "Exemplary Method" section above.

[0134] The computer program product can be written in any combination of one or more programming languages for programming code to perform the operations of the embodiments of the present specification. The programming languages include object-oriented programming languages such as Java, C++, etc., and also include conventional procedural programming languages such as the "C" language or similar programming languages.

[0135] Furthermore, an embodiment of the present specification also provides a computer-readable storage medium, on which a computer program is stored. The computer program is executed by a processor to perform the steps in the auxiliary braking method according to various embodiments of the present specification described in the "Exemplary Method" section above.

[0136] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to a memory, storage, database, or other medium used in the embodiments provided in this specification can include non-volatile and / or volatile memories. Non-volatile memories can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memories can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), Rambus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and Rambus dynamic RAM (RDRAM), etc.

[0137] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0138] The above-described embodiments merely represent several implementation manners of this specification. Their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the solutions provided by the embodiments of this specification. It should be noted that for those of ordinary skill in the art, without departing from the concept of this specification, several modifications and improvements can still be made, and these all belong to the protection scope of this specification. Therefore, the protection scope of the patent of this specification should be subject to the appended claims.

Claims

1. An auxiliary braking system, characterized in that, Applied to a vehicle, the vehicle includes a range extender, the auxiliary braking system includes a retarder and a control device, the retarder is arranged on the range extender, and the range extender engine, the retarder and the range extender generator in the range extender are serially connected in sequence; The control device is connected to the retarder and is used for obtaining the current state of charge of the power battery of the vehicle during the process of braking energy recovery of the drive motor of the vehicle, and controlling the opening and closing of the retarder based on the current state of charge of the power battery; The retarder is used for consuming the electric energy recovered by the drive motor under the drive of the range extender generator when it is turned on.

2. The auxiliary braking system according to claim 1, wherein The drive motor is connected to the range extender and the power battery through an electric energy conversion device, and the control device is connected to the electric energy conversion device; The control device is specifically used for: Based on the magnitude relationship between the current state of charge of the power battery and the preset state of charge, controlling the electric energy conversion device to transmit the electric energy recovered by the drive motor to the power battery and / or the range extender, and controlling the opening and closing of the retarder.

3. The auxiliary braking system according to claim 2, wherein The control device is specifically used for: When the current state of charge of the power battery is greater than the preset state of charge, controlling the electric energy conversion device to transmit at least part of the electric energy recovered by the drive motor to the range extender, and controlling the retarder to be turned on.

4. The auxiliary braking system according to claim 3, characterized in that, The control device is further used for: When controlling the retarder to be turned on, determining the target speed of the range extender generator based on the electric energy transmitted by the electric energy conversion device to the range extender; Based on the target speed, controlling the range extender generator to rotate, and the range extender generator is used for driving the retarder and the range extender engine to rotate during the rotation process.

5. The auxiliary braking system according to claim 4, characterized in that, The control device is specifically used for: Determining the candidate speed of the retarder based on the electric energy transmitted by the electric energy conversion device to the range extender; Based on the candidate speed of the retarder and the upper and lower limit values of the speed of the range extender engine, determining the target speed of the range extender generator.

6. The auxiliary braking system according to claim 5, wherein, The control device is specifically used for: Determining the lower limit value of the speed of the range extender engine based on the temperature of the coolant in the cooling device of the range extender engine, wherein the range extender engine is used for driving the pumping device in the cooling device to operate during the rotation process.

7. The auxiliary braking system according to claim 2, wherein The control device is specifically used for: When the current state of charge of the power battery is less than or equal to the preset state of charge, controlling the electric energy conversion device to transmit the electric energy recovered by the drive motor to the power battery, and controlling the retarder to be turned off.

8. The auxiliary braking system according to any one of claims 1 to 7, characterized in that, The control device is further used for: Determining the maximum recoverable electric energy of the drive motor based on the maximum consumable electric energy of the retarder and the current state of charge of the power battery; Adjusting the braking ratio between the drive motor and the mechanical braking device of the vehicle based on the maximum recoverable electric energy of the drive motor.

9. An auxiliary braking method, characterized in that, Applied to the auxiliary braking system according to any one of claims 1 to 8, the method includes: During the process of the driving motor of the vehicle performing braking energy recovery, obtain the current state of charge of the power battery of the vehicle; Based on the current state of charge of the power battery, control the opening and closing of the retarder.

10. A vehicle, characterized in that, The vehicle includes a range extender, a driving motor, a power battery, and the auxiliary braking system according to any one of claims 1 to 8.

Images