Vehicle auxiliary braking method and device, vehicle and storage medium

Abstract

The application belongs to the technical field of vehicles and discloses a vehicle auxiliary braking method, a vehicle auxiliary braking device, a vehicle and a storage medium. The vehicle auxiliary braking method first determines whether a brake condition is met based on the position of a brake pedal. If the brake condition is met, it is determined that the vehicle is in an engine auxiliary braking mode, that is, whether an engine auxiliary braking condition is met. If the engine auxiliary braking condition is met, the total vehicle driving power and the engine auxiliary braking power are obtained. The engine auxiliary braking power is obtained according to the total vehicle driving power, and the process is simple. Then, the maximum charging power allowed by the power battery is obtained, and the vehicle is controlled to perform auxiliary braking, so as to control the driving motor to recover the braking energy and charge the power battery, thereby recovering part of the energy of the driving motor and achieving the effect of auxiliary braking. In addition, the vehicle auxiliary braking method does not need to additionally set a power consumption box, and the structure is simple.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and more particularly to vehicle auxiliary braking methods, devices, vehicles, and storage media. Background Technology

[0002] Commercial vehicles such as buses and heavy trucks often require auxiliary braking to control vehicle deceleration when descending long slopes in order to safely pass through long downhill sections. Engine-assisted braking is a commonly used auxiliary braking method.

[0003] However, in range-extended commercial vehicles, the engine drives the generator to move and charge the power battery, which in turn drives the drive motor to rotate. The drive motor is connected to the transmission system to deliver power to the gearbox, axle, and other structures. Since the engine is not directly connected to the transmission system, it cannot achieve the engine-assisted braking found in traditional solutions.

[0004] For this type of vehicle, existing technology provides an electric auxiliary braking method that can charge the power battery via a drive motor when the battery is not fully charged, thereby recovering some energy. Furthermore, if the charging current exceeds the maximum permissible charging current, a power consumption tank is simultaneously activated, dissipating some energy through its resistance wires. However, this method requires an additional power consumption tank, leading to a complex vehicle structure and higher costs. Summary of the Invention

[0005] According to one aspect of the present invention, the present invention provides a vehicle auxiliary braking method to solve the problem that when the prior art uses electric auxiliary braking, the vehicle needs to be equipped with an additional power consumption box, resulting in a complex vehicle structure and high cost.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A vehicle auxiliary braking method is implemented through a vehicle, which includes an engine, a generator, a power battery, a drive motor, and wheels. The engine can drive the generator to rotate to charge the power battery, and the power battery can provide electrical energy to the drive motor to drive the wheels to rotate. The drive motor can charge the power battery, and the power battery can provide electrical energy to the generator to drive the crankshaft of the engine to rotate.

[0008] The vehicle auxiliary braking method includes:

[0009] Determine whether braking conditions are met based on the position of the brake pedal;

[0010] If the braking conditions are met, then determine whether the engine-assisted braking conditions are met.

[0011] If the conditions for engine-assisted braking are met, then the vehicle is determined to be in engine-assisted braking mode:

[0012] The engine-assisted braking modes include:

[0013] The method involves obtaining the vehicle's driving power and engine-assisted braking power. Obtaining the engine-assisted braking power includes: obtaining a first mapping relationship between the vehicle's driving power and the engine-assisted braking power; and obtaining the engine-assisted braking power based on the first mapping relationship and the vehicle's driving power.

[0014] Obtain the maximum allowable charging power of the power battery;

[0015] Controlling the vehicle to perform auxiliary braking includes: the drive motor recovering braking energy and charging the power battery, with the charging power being the maximum allowable charging power of the power battery; the power battery driving the generator to reverse-drive the engine for auxiliary braking, with the output power of the power battery to the generator being the engine's auxiliary braking power.

[0016] As a preferred embodiment of the vehicle auxiliary braking method, the engine-assisted braking mode further includes, after controlling the vehicle to perform auxiliary braking:

[0017] Calculate the regenerative braking power of the drive motor and obtain the peak power of the drive motor. The regenerative braking power of the drive motor is the sum of the maximum allowable charging power of the power battery and the auxiliary braking power of the engine.

[0018] Determine the magnitude of the regenerative braking power of the drive motor and the peak power of the drive motor;

[0019] If the regenerative braking power of the drive motor is greater than the peak power of the drive motor, the magnitude of the regenerative braking power of the drive motor is adjusted, and the adjusted regenerative braking power of the drive motor is equal to the current peak power of the drive motor. Adjusting the magnitude of the regenerative braking power of the drive motor includes adjusting the charging power of the power battery or adjusting the output power of the power battery to the generator.

[0020] As a preferred method for vehicle auxiliary braking, after adjusting the magnitude of the regenerative braking power of the drive motor, the system returns to determining whether the braking conditions are met based on the position of the brake pedal.

[0021] As a preferred method for vehicle auxiliary braking, obtaining the vehicle's drive power includes:

[0022] Obtain the input speed n of the transmission, the rolling radius r of the wheel, and the transmission ratio i of the transmission. gThe transmission ratio i of the axle o The transmission mechanical efficiency η between the drive motor and the wheels, the first resistance coefficient f0, the second resistance coefficient f1, the third resistance coefficient f2, the vehicle speed v, the gradient a, the total mass of the vehicle m, and the gravitational acceleration g of the area;

[0023] Calculate the vehicle's drive power P using the following formula:

[0024]

[0025] As a preferred embodiment of the vehicle auxiliary braking method, if the engine auxiliary braking conditions are not met, the vehicle is determined to be in an energy recovery braking mode, which includes:

[0026] Obtain the maximum allowable charging power of the power battery and the regenerative braking power of the drive motor;

[0027] Determine the magnitude of the maximum allowable charging power of the power battery and the regenerative braking power of the drive motor;

[0028] If the regenerative braking power of the drive motor is not greater than the maximum allowable charging power of the power battery, then the drive motor is controlled to regenerate braking energy and charge the power battery, with the charging power being the regenerative braking power of the drive motor.

[0029] As a preferred embodiment of the vehicle auxiliary braking method, if the regenerative braking power of the drive motor is greater than the maximum allowable charging power of the power battery, then the system switches to the engine-assisted braking mode.

[0030] As a preferred method for vehicle auxiliary braking, determining whether the conditions for engine-assisted braking are met includes:

[0031] Determine whether the auxiliary braking button is pressed, and obtain the first duration during which the vehicle's slope is continuously greater than the preset slope, and determine whether the first duration is greater than the preset duration.

[0032] If the auxiliary braking button has been pressed, or the first duration exceeds a preset duration, then the engine auxiliary braking condition is determined to be met. According to another aspect of the present invention, a vehicle auxiliary braking device is provided, disposed in a vehicle, the vehicle including an engine, a generator, a power battery, a drive motor, and wheels. The engine is capable of driving the generator to rotate to charge the power battery, the power battery is capable of providing electrical energy to the drive motor to drive the wheels to rotate; the drive motor is capable of charging the power battery, the power battery is capable of providing electrical energy to the generator to drive the crankshaft of the engine to rotate;

[0033] The vehicle auxiliary braking device includes:

[0034] The braking condition satisfaction judgment module is used to determine whether the braking conditions are met based on the position of the brake pedal.

[0035] The engine-assisted braking condition satisfaction judgment module is used to determine whether the engine-assisted braking condition is satisfied when the braking condition is met.

[0036] The engine auxiliary braking power acquisition module is used to acquire the vehicle drive power and engine auxiliary braking power when the engine auxiliary braking conditions are met.

[0037] The maximum charging power acquisition module is used to acquire the maximum allowable charging power of the power battery;

[0038] The vehicle auxiliary braking control module is used to control the vehicle to perform auxiliary braking.

[0039] According to another aspect of the present invention, a vehicle is provided, comprising an engine, a generator, a power battery, a drive motor, and wheels. The engine is capable of driving the generator to rotate to charge the power battery, and the power battery is capable of providing electrical energy to the drive motor to drive the wheels to rotate. The drive motor is capable of charging the power battery, and the power battery is capable of providing electrical energy to the generator to drive the crankshaft of the engine to rotate. The vehicle further includes:

[0040] Vehicle controller;

[0041] A position sensor is used to detect the position of the brake pedal and send the detected position of the brake pedal to the vehicle controller;

[0042] Memory, used to store one or more programs;

[0043] When the one or more programs are executed by the vehicle controller, the vehicle controller controls the vehicle to implement the above-described vehicle auxiliary braking method.

[0044] According to another aspect of the invention, a storage medium is provided on which a computer program is stored, which, when executed by a vehicle controller, enables the vehicle to implement the aforementioned vehicle auxiliary braking method.

[0045] The beneficial effects of this invention are:

[0046] This invention provides a vehicle auxiliary braking method, device, vehicle, and storage medium. The vehicle auxiliary braking method is implemented through a vehicle. First, it determines whether braking conditions are met based on the position of the brake pedal. If braking conditions are met, it determines whether engine auxiliary braking conditions are met. If engine auxiliary braking conditions are met, the vehicle is determined to be in engine auxiliary braking mode. Engine auxiliary braking mode includes acquiring the vehicle's driving power and engine auxiliary braking power. Acquiring engine auxiliary braking power includes: acquiring a first mapping relationship between the vehicle's driving power and engine auxiliary braking power; and acquiring the engine auxiliary braking power based on the first mapping relationship and the vehicle's driving power. Through these steps, the engine auxiliary braking power can be directly obtained from the vehicle's driving power, making the process simple. Subsequently, the maximum allowable charging power of the power battery is acquired, and the vehicle is controlled to perform auxiliary braking, thereby controlling the drive motor to recover braking energy and charge the power battery, thus recovering part of the energy of the drive motor and achieving the effect of auxiliary braking. Furthermore, since the braking energy recovered by the drive motor is generally large, while charging the power battery, the power battery drives the generator to reverse-drive the engine for auxiliary braking. The output power of the power battery to the generator is the engine auxiliary braking power. This vehicle auxiliary braking method does not require an additional power consumption box, has a simple structure, and is beneficial for cost control. Attached Figure Description

[0047] Figure 1 This is a flowchart of the vehicle auxiliary braking method in an embodiment of the present invention;

[0048] Figure 2 This is a schematic diagram of the vehicle auxiliary braking device in an embodiment of the present invention;

[0049] Figure 3 This is a schematic diagram of the vehicle structure in an embodiment of the present invention.

[0050] In the picture:

[0051] 1. Engine; 2. Generator; 3. Generator controller; 4. Power battery; 5. Drive motor controller; 6. Drive motor; 7. Gearbox; 8. Wheel; 9. Gearbox controller; 10. Vehicle controller; 11. Engine controller; 12. Power battery controller;

[0052] 20. Position sensor; 30. Memory;

[0053] 400. Braking condition satisfaction judgment module; 410. Engine auxiliary braking condition satisfaction judgment module; 420. Engine auxiliary braking power acquisition module; 430. Maximum charging power acquisition module; 440. Vehicle auxiliary braking control module. Detailed Implementation

[0054] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0055] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0056] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0057] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0058] Example 1

[0059] Engine-assisted braking is a commonly used auxiliary braking method. However, in range-extended commercial vehicles, since the engine is not directly connected to the transmission system, engine-assisted braking in traditional solutions cannot be implemented. For this type of vehicle, existing technology provides an electric auxiliary braking method, which can charge the power battery via a drive motor when the battery is not fully charged to recover some energy. Furthermore, if the charging current exceeds the maximum allowable charging current, the power consumption tank is simultaneously activated, dissipating some energy through its resistance wires. However, this method requires an additional power consumption tank, leading to a complex vehicle structure and higher costs.

[0060] To address the aforementioned issues, this embodiment provides a vehicle auxiliary braking method to solve the problem that existing technologies using electric auxiliary braking require an additional power consumption box for the vehicle, resulting in a complex vehicle structure and high costs. This method can be applied in the field of vehicle technology, specifically to models such as range-extended commercial vehicles.

[0061] This vehicle auxiliary braking method can be executed through a vehicle auxiliary braking device, which can be implemented through software and / or hardware and integrated into the vehicle. The vehicle auxiliary braking method is implemented through a vehicle including an engine, generator, power battery, drive motor, and wheels. The engine drives the generator to charge the power battery, and the power battery provides electrical energy to the drive motor, enabling the drive motor to rotate the wheels. The drive motor also charges the power battery, and the power battery provides electrical energy to the generator, enabling the generator to drive the engine crankshaft to rotate, thereby achieving engine-assisted braking.

[0062] Reference Figure 1 The vehicle auxiliary braking method includes the following steps.

[0063] S100: Determines whether braking conditions are met based on the position of the brake pedal.

[0064] The position of the brake pedal can be obtained through a position sensor. The position sensor is used to detect the position of the brake pedal and send it to the vehicle controller. The vehicle controller determines whether the driver has pressed the brake pedal based on the detection result of the brake pedal position. If it is determined that the driver has pressed the brake pedal, then the braking conditions are met.

[0065] If the braking conditions are met, proceed to step S110.

[0066] S110: Determine whether the conditions for engine auxiliary braking are met.

[0067] The criteria for determining whether engine-assisted braking conditions are met include:

[0068] Determine whether the auxiliary braking button has been pressed, and obtain the first duration during which the vehicle's slope is continuously greater than the preset slope, and determine whether the first duration is greater than the preset duration.

[0069] If the auxiliary braking button has been pressed, or the first duration is longer than the preset duration, then the engine auxiliary braking conditions are met.

[0070] The auxiliary braking button is located on the vehicle's dashboard. When driving down a long slope, the driver can actively press the auxiliary braking button to activate engine braking. Additionally, the vehicle can automatically meet the engine braking conditions based on the slope information detected by the slope sensor. Specifically, when the vehicle's slope is detected to be greater than a preset slope, a timer begins, accumulating a first duration. During this period, the vehicle's slope is repeatedly detected. If the slope is still greater than the preset slope, the timer continues; if the slope is not greater than the preset slope, the timer stops and is reset to zero. After the first duration exceeds the preset time, it is determined that the vehicle is on a long downhill slope, thus meeting the engine braking conditions.

[0071] If the conditions for engine-assisted braking are met, the vehicle is determined to be in engine-assisted braking mode. If the vehicle is not yet in engine-assisted braking mode, the vehicle is controlled to enter engine-assisted braking mode; if the vehicle is already in engine-assisted braking mode, the vehicle remains in engine-assisted braking mode without any change.

[0072] The engine-assisted braking mode includes steps S200-S250.

[0073] S200: Obtains the vehicle's drive power and engine auxiliary braking power.

[0074] Obtaining the vehicle's drive power includes:

[0075] Obtain the gearbox input speed n, the wheel rolling radius r, and the gearbox transmission ratio i. g The transmission ratio i of the axle o The transmission mechanical efficiency η between the drive motor and the wheels, the first resistance coefficient f0, the second resistance coefficient f1, the third resistance coefficient f2, the vehicle speed v, the gradient a, the total mass of the vehicle m, and the gravitational acceleration g of the region.

[0076] Calculate the vehicle's drive power P using the following formula:

[0077]

[0078] The gearbox input speed n can be obtained by a speed sensor installed on the gearbox input shaft, and the gearbox transmission ratio i... g The axle gear ratio i can be obtained by acquiring the current gear position of the transmission. oThis refers to the transmission ratio of the vehicle's main reducer. The vehicle speed v can be obtained from the vehicle speed sensor, and the slope a can be obtained from the slope sensor. The rolling radius r of the wheels, the transmission mechanical efficiency η between the gearbox input shaft and the wheels, and the total vehicle mass m can all be obtained directly by querying the vehicle's parameters. The first drag coefficient f0, the second drag coefficient f1, and the third drag coefficient f2 can be obtained by looking up tables according to relevant standards, such as "GB / T 18386-2017 Test Method for Energy Consumption Rate and Driving Range of Electric Vehicles". In this method, the constant term, linear term coefficient, and quadratic term coefficient in the recommended value of the driving drag coefficient are obtained by looking up the table according to the maximum design total mass of the vehicle. The above three values ​​correspond to the first drag coefficient f0, the second drag coefficient f1, and the third drag coefficient f2 in the formula, respectively. The gravitational acceleration g of the current location can be obtained by vehicle positioning and querying the gravitational acceleration g of the current location of the vehicle.

[0079] In addition, obtaining engine-assisted braking power includes:

[0080] Obtain the first mapping relationship between the vehicle's driving power and the engine's auxiliary braking power.

[0081] The engine auxiliary braking power is obtained based on the first mapping relationship and the vehicle's driving power.

[0082] The above steps allow for the direct acquisition of engine-assisted braking power based on the vehicle's overall drive power, a simple process. The initial mapping relationship can be obtained through extensive prior testing.

[0083] S210: Obtain the maximum allowable charging power of the power battery.

[0084] The maximum allowable charging power of the power battery can be obtained through map1, which is the relationship between the power battery temperature, the power battery charge, and the maximum allowable charging power. Specifically, the power battery temperature is obtained by a first temperature sensor installed on the power battery, the power battery charge is obtained by the power battery controller, and the maximum allowable charging power is obtained based on map1. Map1 can be obtained through extensive preliminary testing and is preset in the vehicle controller.

[0085] S220: Controls the vehicle to perform auxiliary braking.

[0086] Controlling the vehicle for auxiliary braking includes: the drive motor recovering braking energy and charging the power battery at the maximum allowable charging power of the power battery; the power battery driving the generator to reverse-drive the engine for auxiliary braking, with the power battery's output power to the generator being the engine's auxiliary braking power. In essence, the drive motor recovers braking energy and delivers it to the power battery in the form of electrical energy. A portion of this energy is used to charge the power battery, while the remaining energy is output from the power battery for engine-assisted braking.

[0087] The vehicle auxiliary braking method provided in this embodiment is implemented through a vehicle. First, it determines whether braking conditions are met based on the position of the brake pedal. If braking conditions are met, it then determines whether engine auxiliary braking conditions are met. If engine auxiliary braking conditions are met, the vehicle is determined to be in engine auxiliary braking mode. Engine auxiliary braking mode includes acquiring the vehicle's driving power and engine auxiliary braking power. Acquiring engine auxiliary braking power includes: acquiring a first mapping relationship between the vehicle's driving power and engine auxiliary braking power; and acquiring the engine auxiliary braking power based on the first mapping relationship and the vehicle's driving power. Through the above steps, the engine auxiliary braking power can be directly obtained from the vehicle's driving power, making the process simple. Subsequently, the maximum allowable charging power of the power battery is acquired, and the vehicle is controlled to perform auxiliary braking, thereby controlling the drive motor to recover braking energy and charge the power battery, thus recovering part of the energy of the drive motor and achieving the effect of auxiliary braking. In addition, since the braking energy recovered by the drive motor is generally large, while charging the power battery, the power battery drives the generator to reverse-drive the engine for auxiliary braking. The output power of the power battery to the generator is the engine auxiliary braking power. This vehicle auxiliary braking method does not require an additional power consumption box, has a simple structure, and is conducive to cost control.

[0088] In this embodiment, the engine-assisted braking mode further includes the following steps following S220.

[0089] S230: Calculate the regenerative braking power of the drive motor and obtain the peak power of the drive motor.

[0090] In addition, in this mode, the power battery is always charged at the maximum allowable charging power, so the regenerative braking power of the drive motor is the sum of the maximum allowable charging power of the power battery and the engine auxiliary braking power.

[0091] The peak power of the drive motor can be obtained through a second mapping relationship between the drive motor temperature and the peak power of the drive motor, preset in the vehicle controller. Specifically, the temperature of the drive motor is obtained by a second temperature sensor installed on the drive motor, and the peak power of the drive motor at that temperature is obtained based on the second mapping relationship. The second mapping relationship can be obtained through extensive preliminary experiments. Generally speaking, when the temperature is low, the peak power of the drive motor does not change with the temperature. However, when the temperature is high, for example, above 140°C, the peak power of the drive motor gradually decreases as the temperature rises, thus limiting the peak power of the drive motor.

[0092] S240: Determine the magnitude of the regenerative braking power of the drive motor and the peak power of the drive motor.

[0093] If the regenerative braking power of the drive motor is greater than the peak power of the drive motor, then step S250 is executed.

[0094] S250: Adjusts the magnitude of the regenerative braking power of the drive motor, and the adjusted regenerative braking power of the drive motor is equal to the current peak power of the drive motor.

[0095] Since the regenerative braking power of the drive motor should not exceed the peak power of the drive motor, if the regenerative braking power of the drive motor exceeds the peak power, the magnitude of the regenerative braking power needs to be adjusted. The vehicle controller can adjust the engine auxiliary braking power based on the adjusted regenerative braking power of the drive motor. Specifically, the engine auxiliary braking power is equal to the adjusted regenerative braking power of the drive motor minus the maximum allowable charging power of the power battery.

[0096] Adjusting the regenerative braking power of the drive motor includes adjusting the charging power of the power battery or adjusting the output power of the power battery to the generator, so that the sum of the charging power of the power battery and the output power of the power battery to the generator is equal to the adjusted regenerative braking power of the drive motor.

[0097] Optionally, after step S250, return to step S100 to repeat the above steps, determine whether the vehicle's operating status has changed, and if it has changed, take corresponding adjustment measures.

[0098] Furthermore, in this vehicle auxiliary braking method, in step S110, if the engine auxiliary braking conditions are not met, the vehicle is determined to be in energy recovery braking mode. If the vehicle is not yet in energy recovery braking mode, the vehicle is controlled to enter energy recovery braking mode; if the vehicle is already in energy recovery braking mode, the vehicle is kept in energy recovery braking mode and no change is made.

[0099] The energy recovery braking mode includes steps S300-S320.

[0100] S300: Obtain the maximum allowable charging power of the power battery and the regenerative braking power of the drive motor.

[0101] The maximum allowable charging power of the power battery can also be obtained through map1. The regenerative braking power of the drive motor can be obtained through map2, which is the relationship between the brake pedal position, vehicle speed, motor speed, and the regenerative braking power of the drive motor. Specifically, the position of the brake pedal is detected by a position sensor, the vehicle speed is obtained by a vehicle speed sensor, the motor speed is obtained by a speed sensor, and the regenerative braking power of the drive motor is obtained based on map2. Map2 can be obtained through extensive preliminary testing and is preset in the vehicle controller.

[0102] S310: Determine the maximum allowable charging power of the power battery and the magnitude of the regenerative braking power of the drive motor.

[0103] If the regenerative braking power of the drive motor is greater than the maximum charging power allowed by the power battery, it indicates that the energy recovery demand of the drive motor cannot be met by charging the power battery alone. Therefore, the system switches to engine-assisted braking mode, i.e., steps S200-S250 are executed to control the vehicle to be in engine-assisted braking mode.

[0104] If the power recovered by the drive motor is not greater than the maximum charging power allowed by the power battery, it indicates that the energy recovery requirement of the drive motor can be met by charging the power battery alone, and therefore step S320 is executed.

[0105] S320: Controls the drive motor to recover braking energy and charge the power battery.

[0106] The charging power is the regenerative braking power of the drive motor, which charges the power battery through the drive motor to achieve braking.

[0107] Optionally, after step S320, return to step S100 to repeat the above steps, determine whether the vehicle's operating status has changed, and if it has changed, take corresponding adjustment measures.

[0108] Example 2

[0109] This embodiment provides a vehicle auxiliary braking device that can execute the vehicle auxiliary braking method described in the above embodiment. The vehicle auxiliary braking device is installed in a vehicle, which includes an engine, a generator, a power battery, a drive motor, and wheels. The engine can drive the generator to rotate, thereby charging the power battery. The power battery can provide electrical energy to the drive motor, enabling the drive motor to drive the wheels to rotate. The drive motor can charge the power battery, and the power battery can provide electrical energy to the generator, enabling the generator to drive the crankshaft of the engine to rotate.

[0110] Specifically, such as Figure 2 As shown, the vehicle auxiliary braking device includes a braking condition satisfaction judgment module 400, an engine auxiliary braking condition satisfaction judgment module 410, an engine auxiliary braking power acquisition module 420, a maximum charging power acquisition module 430, and an engine auxiliary braking mode deactivation module 440.

[0111] The braking condition satisfaction judgment module 400 is used to determine whether the braking condition is met based on the position of the brake pedal; the engine auxiliary braking condition satisfaction judgment module 410 is used to determine whether the engine auxiliary braking condition is met when the braking condition is met; the engine auxiliary braking power acquisition module 420 is used to acquire the vehicle drive power and engine auxiliary braking power when the engine auxiliary braking condition is met; the maximum charging power acquisition module 430 is used to acquire the maximum allowable charging power of the power battery; and the vehicle auxiliary braking control module 440 is used to control the vehicle to perform auxiliary braking.

[0112] The vehicle auxiliary braking device provided in this embodiment can determine whether braking conditions are met based on the position of the brake pedal using a braking condition satisfaction judgment module 400. When braking conditions are met, an engine auxiliary braking condition satisfaction judgment module 410 determines whether engine auxiliary braking conditions are met. When engine auxiliary braking conditions are met, an engine auxiliary braking power acquisition module 420 acquires the vehicle's driving power and engine auxiliary braking power; a maximum charging power acquisition module 430 acquires the maximum allowable charging power of the power battery; and a vehicle auxiliary braking control module 440 controls the vehicle to perform auxiliary braking. This vehicle auxiliary braking device does not require an additional power consumption box, has a simple structure, and is beneficial for cost control.

[0113] Example 3

[0114] This embodiment provides a vehicle, as shown in the following example. Figure 3The vehicle includes an engine 1, a generator 2, a power battery 4, a drive motor 6, and wheels 8. The engine 1 can drive the generator 2 to rotate to charge the power battery 4. The power battery 4 can provide electrical energy to the drive motor 6 so that the drive motor 6 can drive the wheels 8 to rotate. The drive motor 6 can charge the power battery 4. The power battery 4 can provide electrical energy to the generator 2 so that the generator 2 can drive the crankshaft of the engine 1 to rotate.

[0115] In addition, the vehicle also includes a vehicle controller 10, a position sensor 20, and a memory 30. The position sensor 20 and the memory 30 are both connected to the vehicle controller 10. The position sensor 20 is used to detect the position of the brake pedal and send the detected position of the brake pedal to the vehicle controller 10.

[0116] The memory 30, as a computer-readable storage medium, can be used to store software programs, computer-executable programs, and modules, such as the program instructions / modules corresponding to the vehicle auxiliary braking method in the embodiments of the present invention. The vehicle controller 10 executes various vehicle functions and data processing by running the software programs, instructions, and modules stored in the memory 30, thereby realizing the vehicle auxiliary braking method of the above embodiments.

[0117] The memory 30 primarily includes a program storage area and a data storage area. The program storage area stores the operating system and at least one application program required for a given function; the data storage area stores data created based on terminal usage. Furthermore, the memory 30 may include high-speed random access memory and non-volatile memory, such as at least one disk storage device, flash memory, or other non-volatile solid-state storage device. In some instances, the memory 30 may further include remotely configured memories 30 relative to the vehicle controller 10, which can be connected to the vehicle via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0118] Optionally, the vehicle also includes a generator controller 3, a drive motor controller 5, a transmission 7, a transmission controller 9, and an engine controller 11. The engine 1 and generator 2, the drive motor 6 and transmission 7, and the transmission 7 and wheels 8 are all mechanically connected. The generator 2 and generator controller 3, the generator controller 3 and power battery 4, the power battery 4 and drive motor controller 5, and the drive motor controller 5 and drive motor 6 are all connected via high-voltage wiring harnesses. Furthermore, the generator 2 and generator controller 3, the drive motor controller 5 and drive motor 6, the engine 1 and engine controller 11, and the transmission 7 and transmission controller 9 are communicatively connected. The generator controller 3, drive motor controller 5, transmission controller 9, engine controller 11, and vehicle controller 10 are connected via a bus. Additionally, the position sensor 20 and memory 30 can be individually connected to the vehicle controller 10 or connected to the bus.

[0119] The vehicle provided in this embodiment of the invention and the vehicle auxiliary braking method provided in the above embodiments belong to the same inventive concept. Technical details not described in detail in this embodiment can be found in the above embodiments. Furthermore, this embodiment has the same beneficial effects as the vehicle auxiliary braking method.

[0120] Example 4

[0121] The present invention also provides a storage medium storing a computer program thereon, which, when executed by the vehicle controller, enables the vehicle to implement the vehicle auxiliary braking method as described in the above embodiments of the present invention.

[0122] Of course, the storage medium containing computer-executable instructions provided in the embodiments of the present invention is not limited to the operations in the vehicle auxiliary braking method as described above, but can also perform related operations in the vehicle auxiliary braking device provided in the embodiments of the present invention, and has corresponding functions and beneficial effects.

[0123] Based on the above description of the implementation methods, those skilled in the art can clearly understand that the present invention can be implemented using software and necessary general-purpose hardware, and of course, it can also be implemented using hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as a computer floppy disk, read-only memory (ROM), random access memory (RAM), flash memory, hard disk, or optical disk, etc., including several instructions to cause a computer device (which may be a robot, personal computer, server, or network device, etc.) to execute the vehicle auxiliary braking method described in the various embodiments of the present invention.

[0124] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A vehicle auxiliary braking method, characterized in that, Implemented via a vehicle, the vehicle includes an engine, a generator, a power battery, a drive motor, and wheels. The engine can drive the generator to rotate, thereby charging the power battery. The power battery can provide electrical energy to the drive motor, enabling the drive motor to drive the wheels to rotate. The drive motor can charge the power battery, and the power battery can provide electrical energy to the generator, enabling the generator to drive the crankshaft of the engine to rotate. The vehicle auxiliary braking method includes: Determine whether braking conditions are met based on the position of the brake pedal; If the braking conditions are met, then determine whether the engine-assisted braking conditions are met. If the conditions for engine-assisted braking are met, then the vehicle is determined to be in engine-assisted braking mode: The engine-assisted braking modes include: The method involves obtaining the vehicle's driving power and engine-assisted braking power. Obtaining the engine-assisted braking power includes: obtaining a first mapping relationship between the vehicle's driving power and the engine-assisted braking power; and obtaining the engine-assisted braking power based on the first mapping relationship and the vehicle's driving power. Obtain the maximum allowable charging power of the power battery; Controlling the vehicle to perform auxiliary braking includes: the drive motor recovering braking energy and charging the power battery, with the charging power being the maximum allowable charging power of the power battery; the power battery driving the generator to reverse-drive the engine for auxiliary braking, with the output power of the power battery to the generator being the engine's auxiliary braking power; The engine-assisted braking mode also includes a mode located after controlling the vehicle to perform assisted braking: Calculate the regenerative braking power of the drive motor and obtain the peak power of the drive motor. The regenerative braking power of the drive motor is the sum of the maximum allowable charging power of the power battery and the auxiliary braking power of the engine. Determine the magnitude of the regenerative braking power of the drive motor and the peak power of the drive motor; If the regenerative braking power of the drive motor is greater than the peak power of the drive motor, the magnitude of the regenerative braking power of the drive motor is adjusted, and the adjusted regenerative braking power of the drive motor is equal to the current peak power of the drive motor. Adjusting the magnitude of the regenerative braking power of the drive motor includes adjusting the charging power of the power battery or adjusting the output power of the power battery to the generator.

2. The vehicle auxiliary braking method according to claim 1, characterized in that, After adjusting the magnitude of the regenerative braking power of the drive motor, the system returns to determining whether the braking conditions are met based on the position of the brake pedal.

3. The vehicle auxiliary braking method according to any one of claims 1-2, characterized in that, If the engine-assisted braking conditions are not met, the vehicle is determined to be in energy recovery braking mode, which includes: Obtain the maximum allowable charging power of the power battery and the regenerative braking power of the drive motor; Determine the magnitude of the maximum allowable charging power of the power battery and the regenerative braking power of the drive motor; If the regenerative braking power of the drive motor is not greater than the maximum allowable charging power of the power battery, then the drive motor is controlled to regenerate braking energy and charge the power battery, with the charging power being the regenerative braking power of the drive motor.

4. The vehicle auxiliary braking method according to claim 3, characterized in that, If the regenerative braking power of the drive motor is greater than the maximum charging power allowed by the power battery, then switch to the engine-assisted braking mode.

5. The vehicle auxiliary braking method according to any one of claims 1-2, characterized in that, Determining whether the conditions for engine-assisted braking are met includes: Determine whether the auxiliary braking button is pressed, and obtain the first duration during which the vehicle's slope is continuously greater than the preset slope, and determine whether the first duration is greater than the preset duration. If the auxiliary braking button has been pressed, or the first duration is longer than the preset duration, then the engine auxiliary braking conditions are determined to be met.

6. A vehicle auxiliary braking device for performing the vehicle auxiliary braking method as described in any one of claims 1-5, characterized in that, The vehicle is equipped with an engine, a generator, a power battery, a drive motor, and wheels. The engine can drive the generator to rotate to charge the power battery. The power battery can provide electrical energy to the drive motor so that the drive motor can drive the wheels to rotate. The drive motor can charge the power battery, and the power battery can provide electrical energy to the generator so that the generator can drive the crankshaft of the engine to rotate. The vehicle auxiliary braking device includes: The braking condition satisfaction judgment module is used to determine whether the braking conditions are met based on the position of the brake pedal. The engine-assisted braking condition satisfaction judgment module is used to determine whether the engine-assisted braking condition is satisfied when the braking condition is met. The engine auxiliary braking power acquisition module is used to acquire the vehicle drive power and engine auxiliary braking power when the engine auxiliary braking conditions are met. The maximum charging power acquisition module is used to acquire the maximum allowable charging power of the power battery; The vehicle auxiliary braking control module is used to control the vehicle to perform auxiliary braking.

7. A vehicle, characterized in that, The system includes an engine, a generator, a power battery, a drive motor, and wheels. The engine can drive the generator to rotate to charge the power battery. The power battery can provide electrical energy to the drive motor so that the drive motor can drive the wheels to rotate. The drive motor can charge the power battery, and the power battery can provide electrical energy to the generator so that the generator can drive the crankshaft of the engine to rotate. The vehicle also includes: Vehicle controller; A position sensor is used to detect the position of the brake pedal and send the detected position of the brake pedal to the vehicle controller; Memory, used to store one or more programs; When the one or more programs are executed by the vehicle controller, the vehicle controller controls the vehicle to implement the vehicle auxiliary braking method as described in any one of claims 1-5.

8. A storage medium having a computer program stored thereon, characterized in that, When the program is executed by the vehicle controller, the vehicle implements the vehicle auxiliary braking method as described in any one of claims 1-5.

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