Braking system, braking control method and device for extended-range vehicle

Abstract

The present application discloses a braking system, a braking control method and a device for an extended-range vehicle. The braking system of the extended-range vehicle includes: a main reducer, which is connected to a drive motor; a resistor retarder, which is connected to the drive motor and is used to consume part of the electric energy converted from the braking power recovered by the drive motor; an electric brake retarder, which is arranged on the connection channel between the drive motor and the main reducer and is connected to the battery through a DC converter to provide braking power and / or absorb braking power. The braking system of the extended-range vehicle includes a resistor retarder and an electric brake retarder. In application, at least one retarder can be controlled to be enabled based on the on-site braking demand and the braking power recovery demand; adding an electric brake retarder can improve the recovery power when the braking power of the drive motor is limited, thereby improving the economy of the whole vehicle, and adding a resistor retarder can improve the braking performance when the battery charging power is limited.

Description

Technical Field

[0001] The present application relates to the technical field of hybrid electric vehicles, and more specifically, to a braking system, a braking control method and a device for an extended-range vehicle. Background Art

[0002] In hybrid vehicle systems, the braking system can often only recover braking energy through the motor. However, this realization of braking energy recovery through the motor cannot well match the braking energy recovery demand, resulting in excessive mechanical wear of traditional brakes. Summary of the invention

[0003] In view of this, this application provides the following technical solutions:

[0004] The first aspect of the present application provides a braking system for an extended-range vehicle, comprising:

[0005] A main reducer connected to a driving motor;

[0006] A resistance retarder connected to the drive motor and used to consume part of the electric energy converted from the braking power recovered by the drive motor;

[0007] The electric brake retarder is arranged on the connection channel between the drive motor and the main reducer, and is connected to the battery through a DC converter, and is used to provide braking power and / or absorb braking power.

[0008] In a possible implementation, the resistance retarder is a variable resistance retarder.

[0009] In a possible implementation, the electric brake retarder is an eddy current retarder.

[0010] A second aspect of the present application provides a braking control method, which is applied to the braking system of any of the above-mentioned extended-range vehicles, comprising:

[0011] Obtain the braking power required by the vehicle;

[0012] Determine the braking power that the battery can recover based on the current electrical parameters of the battery;

[0013] If the braking power that can be recovered by the battery is greater than or equal to the braking power required by the vehicle, determining whether the drive motor meets the braking demand;

[0014] If yes, controlling the driving motor to provide the required braking power of the whole vehicle;

[0015] If not, the driving motor and the electric brake retarder are controlled to jointly provide the required braking power of the whole vehicle.

[0016] In a possible implementation, the control of the drive motor and the electric brake retarder jointly providing the vehicle braking power requirement includes:

[0017] Determining whether the power that can be provided by the driving motor and the electric brake retarder acting together can meet the braking power requirement of the whole vehicle;

[0018] If yes, determining a first braking power required to be provided by the driving motor and a second braking power required to be provided by the electric braking retarder based on efficiency curves of the driving motor and the electric braking retarder, wherein the sum of the first braking power and the second braking power is equal to the braking power requirement of the whole vehicle;

[0019] If not, the control starts the exhaust brake function of the range extender engine.

[0020] In one possible implementation, the controlling and starting the range extender engine exhaust braking function includes:

[0021] If the exhaust brake power of the range extender engine can be set, the exhaust brake power of the range extender engine is set based on the difference between the vehicle braking demand power and the sum of the braking powers output by the drive motor and the electric brake retarder, and the exhaust brake function is started;

[0022] If the exhaust braking power of the range extender engine cannot be set, the exhaust braking power of the range extender engine is determined based on the current engine speed, and the exhaust braking function is started; the differential braking power between the vehicle braking demand power and the exhaust braking power is controlled to be provided by the drive motor first; when the braking power that the drive motor can provide is lower than the differential braking power, the electric brake retarder is controlled to provide the remaining braking power, and the remaining braking power is the difference between the differential braking power and the braking power provided by the drive motor.

[0023] In a possible implementation, it also includes:

[0024] Determining whether the braking power that can be recovered by the driving motor is greater than or equal to the braking power required by the entire vehicle;

[0025] If the braking power that can be recovered by the drive motor is greater than or equal to the braking power required by the vehicle, determine whether the braking power that can be recovered by the battery is greater than or equal to the braking power required by the vehicle based on the current electrical parameters of the battery;

[0026] If the braking power that can be recovered by the battery is greater than or equal to the braking power required by the vehicle, control the drive motor to recover all the braking power and convert the braking power into electrical energy and input it into the battery;

[0027] If the braking power that can be recovered by the battery is less than the braking power required by the whole vehicle, the resistance retarder is controlled to be enabled and the braking power recovered by the resistance retarder is determined, so that the braking power recovered by the drive motor is partially converted into electric energy and input into the battery; if the battery still cannot recover the remaining electric energy obtained by the braking power conversion when the resistance value of the resistance retarder reaches the maximum, the exhaust braking function of the range extender engine is controlled to be started, and the braking power recovered by the drive motor is reduced until the battery and the resistance retarder can completely receive or consume the electric energy converted by the drive motor;

[0028] If the braking power that can be recovered by the drive motor is less than the required braking power of the whole vehicle, the exhaust braking function of the range extender engine is controlled to be started to reduce the braking power output by the drive motor.

[0029] In one possible implementation, the resistance retarder is a variable resistance retarder, the regenerative braking power of the variable resistance retarder is determined based on the resistance value of the variable resistance retarder, and the resistance value of the variable resistance retarder is determined based on at least part of the vehicle braking demand power, the maximum regenerative power of the battery, the maximum available power of the battery, the battery voltage and the maximum resistance value of the variable resistance retarder.

[0030] In a possible implementation, it also includes:

[0031] If the difference between the vehicle braking power requirement and the maximum recovery power of the drive motor is less than a first threshold, or the difference between the vehicle braking power requirement and the available charging power of the battery is less than a second threshold, the range extender engine is started through generator control.

[0032] The third aspect of the present application provides a brake control device, which is applied to any of the above-mentioned extended-range vehicle brake systems, including:

[0033] A power acquisition module is used to obtain the braking power required by the vehicle;

[0034] A power determination module, used to determine the braking power that can be recovered by the battery based on the current electrical parameters of the battery;

[0035] A demand judgment module, used to determine whether the drive motor meets the braking demand when the braking power that can be recovered by the battery is greater than or equal to the braking power required by the vehicle;

[0036] A first control module, configured to control the drive motor to provide the required braking power of the vehicle when the judgment result of the demand judgment module is yes;

[0037] The second control module is used to control the drive motor and the electric brake retarder to jointly provide the vehicle braking demand power when the judgment result of the demand judgment module is no.

[0038] It can be seen from the above technical solutions that the embodiments of the present application disclose a braking system, a braking control method and a device for an extended-range vehicle. The braking system of the extended-range vehicle includes a resistor retarder and an electric brake retarder. In an application, at least one retarder can be controlled to be enabled based on on-site braking requirements and braking power recovery requirements; adding an electric brake retarder can increase the recovery power when the braking power of the drive motor is limited, thereby improving the economy of the entire vehicle; adding a resistor retarder can improve the braking performance when the battery charging power is limited. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0040] Figure 1 A schematic diagram of the structural layout of a braking system of an extended-range vehicle disclosed in an embodiment of the present application;

[0041] Figure 2 A flowchart of a braking control method disclosed in an embodiment of the present application;

[0042] Figure 3 This is a schematic diagram of the logic for determining the braking power requirement of the vehicle disclosed in the embodiment of the present application;

[0043] Figure 4 A flow chart of a drive motor and an electric brake retarder jointly providing braking power disclosed in an embodiment of the present application;

[0044] Figure 5 A flowchart of controlling brake energy recovery disclosed in an embodiment of the present application;

[0045] Figure 6 A schematic diagram of the engine start control logic disclosed in an embodiment of the present application;

[0046] Figure 7 This is a schematic diagram of the structure of the brake control device disclosed in an embodiment of the present application. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0048] Figure 1 The schematic diagram of the structure layout of the braking system of a range-extended vehicle disclosed in the embodiment of the present application is shown in FIG. Figure 1 As shown, the braking system of the extended-range vehicle may include:

[0049] A main reducer 10 is connected to the driving motor.

[0050] The main reducer is used to increase the torque from the transmission or universal transmission device, while reducing the speed and changing the direction of torque transmission. The main reducer is composed of one or more pairs of reduction gears. The power is input by the driving gear and output by the driven gear. The main reducer in the present application is no different from the main reducer in the traditional solution in terms of function and structure, so it will not be introduced in detail.

[0051] The resistance retarder 20 is connected to the driving motor and is used to consume part of the electric energy converted from the braking power recovered by the driving motor.

[0052] The resistance retarder is a resistor, which generates heat when connected to electric energy and consumes some electric energy. In the embodiment of the present application, the resistance retarder is connected to the drive motor to consume part of the electric energy converted from the braking power recovered by the drive motor.

[0053] In one implementation, the resistance retarder may be a variable resistance retarder, and different resistance values ​​may be configured based on the electric energy to be consumed in the application to assist the drive motor in recovering braking power to the maximum extent.

[0054] The electric brake retarder 30 is arranged on the connection channel between the driving motor and the main reducer, and is connected to the battery through a DC converter 31, and is used to provide braking power and / or absorb braking power.

[0055] The DC converter may be a DCDC converter, and the electric brake retarder may be an eddy current retarder, which can assist in providing additional braking power when the drive motor cannot provide sufficient braking power, thereby ensuring that the total braking power provided to the main reducer meets the braking power requirement of the entire vehicle.

[0056] In addition, when the braking power is recovered, the electric brake retarder can also recover part of the braking power and convert it into electrical energy that can be received by the battery and input into the battery.

[0057] It should be noted that the various parts of the braking system disclosed above focus on introducing the contents that are different from the traditional braking system structure or the contents that are highly correlated with the traditional braking system structure. The original components of the braking system, such as the energy supply device, control device, transmission device, brake, etc., still exist in the braking system, and this application will not introduce them in detail.

[0058] The braking system of the extended-range vehicle described in this embodiment includes a resistor retarder and an electric brake retarder. In the application, at least one retarder can be controlled to be enabled based on the on-site braking demand and the braking power recovery demand. Adding an electric brake retarder can improve the recovery power when the driving motor braking power is limited, and improve the economy of the whole vehicle. Adding a resistor retarder can improve the braking performance when the battery charging power is limited. In addition, setting the resistor retarder to a variable resistor retarder can take into account part of the economy. The combination of the two retarders can not only optimize the braking performance, but also improve the economy of the whole vehicle.

[0059] Figure 2 This is a flow chart of a braking control method disclosed in an embodiment of the present application. Figure 2 The method shown can be applied to the braking system described in the above embodiment. Figure 2 As shown, the braking control method may include:

[0060] Step 201: Obtain the braking power requirement of the entire vehicle.

[0061] In the implementation, the braking power requirement of the vehicle can be determined according to the driver's intention decision. The schematic diagram of the logic implementation of determining the braking power requirement of the vehicle is shown in the figure. Figure 3 As shown. Combined Figure 3 When the brake pedal opening is greater than 0, the vehicle's braking torque requirement is calculated based on the brake pedal opening and vehicle speed; when in cruising state, the vehicle's braking torque requirement is the braking torque part of cruising. When the throttle and brake openings are equal to 0, the vehicle's braking torque requirement is the cruise setting torque; in other cases, the vehicle's braking torque requirement is 0. After determining the vehicle's braking torque requirement, the vehicle's braking power requirement can be determined accordingly.

[0062] Step 202: Determine the braking power that can be recovered by the battery based on the current electrical parameters of the battery.

[0063] In the embodiment of the present application, after obtaining the braking power requirement of the whole vehicle, firstly, it is determined whether the braking power that can be recovered by the battery is greater than or equal to the braking power requirement of the whole vehicle based on the current electrical parameters of the battery. The current electrical parameters of the battery can be directly called and obtained.

[0064] Step 203: If the braking power that can be recovered by the battery is greater than or equal to the braking power required by the vehicle, determine whether the drive motor meets the braking requirement. If so, proceed to step 204; if not, proceed to step 205.

[0065] For extended-range electric vehicles equipped with a retarder, the braking force they can provide comes from three aspects: electric braking, traditional mechanical braking, and engine cylinder braking. Electric braking can include dynamic motor braking energy recovery, electric brake retarder braking energy recovery, and variable resistor heat dissipation. In actual application scenarios, it is possible to determine which braking method or methods to enable based on the vehicle status and the drive motor and battery status.

[0066] In the present application, if the braking power that the battery can recover is greater than or equal to the braking power required by the vehicle, it is necessary to determine whether the drive motor meets the braking demand, that is, to determine whether the drive motor can provide the braking power required by the vehicle.

[0067] Step 204: Control the drive motor to provide the required braking power of the whole vehicle.

[0068] For braking power, the most ideal and common way is to drive the motor to recover braking power and convert it into electrical energy to charge the battery. This can fully recover braking energy without adding additional configuration. However, in actual operation, it may be necessary to determine the braking method and braking power recovery method based on actual conditions or status.

[0069] In the embodiment of the present application, if the driving motor meets the braking requirement, the driving motor can be directly controlled to output the braking power alone, that is, the driving motor outputs the braking power required for the entire vehicle.

[0070] Step 205: Control the drive motor and the electric brake retarder to jointly provide the required braking power of the entire vehicle.

[0071] If the drive motor does not meet the braking demand, that is, the maximum power that the drive motor can output is lower than the braking power requirement of the vehicle, the drive motor and the electric brake retarder can be controlled to jointly bear the braking power requirement of the vehicle to ensure the braking demand.

[0072] The braking control method described in this embodiment can effectively meet the braking demand based on the drive motor and the electric brake retarder. At the same time, the existence of the drive motor and the electric brake buffer provides the possibility for diversified recovery of braking power, which can improve the overall system economy.

[0073] Figure 4 The flowchart of the driving motor and the electric brake retarder jointly providing braking power disclosed in the embodiment of the present application is shown in FIG. Figure 4 As shown, in the above-mentioned embodiment, the control of the driving motor and the electric brake retarder jointly providing the vehicle braking power requirement may include:

[0074] Step 401: Determine whether the power provided by the driving motor and the electric brake retarder can meet the braking power requirement of the vehicle. If yes, proceed to step 402; if not, proceed to step 403.

[0075] That is, it is determined whether the sum of the maximum braking power that can be provided by the drive motor and the maximum braking power that can be provided by the electric brake retarder is greater than or equal to the required braking power of the entire vehicle.

[0076] Step 402: Determine a first braking power required to be provided by the driving motor and a second braking power required to be provided by the electric braking retarder based on efficiency curves of the driving motor and the electric braking retarder, wherein the sum of the first braking power and the second braking power is equal to the braking power requirement of the entire vehicle.

[0077] If the sum of the maximum braking power that the drive motor can provide and the maximum braking power that the electric brake retarder can provide is greater than or equal to the required braking power of the whole vehicle, the braking power can be reasonably allocated according to the efficiency curves of the drive motor and the electric brake retarder.

[0078] Step 403: Control and start the exhaust brake function of the range extender engine.

[0079] If the sum of the maximum braking power that the drive motor can provide and the maximum braking power that the electric brake retarder can provide is still lower than the required braking power of the vehicle, the range extender engine exhaust brake can be further activated to provide greater braking force to meet the braking demand.

[0080] In one implementation, the control to start the exhaust braking function of the range extender engine may include: if the exhaust braking power of the range extender engine is settable, setting the exhaust braking power of the range extender engine based on the difference between the braking demand power of the whole vehicle and the sum of the braking powers output by the drive motor and the electric brake retarder, and starting the exhaust braking function; if the exhaust braking power of the range extender engine is not settable, determining the exhaust braking power of the range extender engine based on the current engine speed, and starting the exhaust braking function; controlling the differential braking power between the braking demand power of the whole vehicle and the exhaust braking power to be provided by the drive motor first; when the braking power that the drive motor can provide is lower than the differential braking power, controlling the electric brake retarder to provide the remaining braking power, and the remaining braking power is the difference between the differential braking power and the braking power provided by the drive motor.

[0081] That is, for systems where the exhaust brake power can be set, the remaining power after removing the electric brake power that the drive motor and the electric brake retarder can provide will be allocated to the engine exhaust brake. For systems where the exhaust brake power cannot be set, only the fixed brake power at the current speed can be used. If at this time the engine exhaust brake power, the drive motor brake power and the electric brake retarder brake power have exceeded the brake power requirement (the required braking power of the whole vehicle), the brake power of the electric brake retarder will be reduced first. If the brake power of the electric brake retarder is still exceeded after it is reduced to 0, the drive motor brake power will be gradually reduced until the sum of the engine exhaust brake power and the drive motor brake power can meet the required braking power of the whole vehicle.

[0082] Based on the above content, it can be effectively ensured that the braking system can provide braking power that meets the braking requirements under different conditions.

[0083] In other implementations, the braking control method may also include controlling braking energy recovery. Figure 5 This is a flow chart of controlling brake energy recovery disclosed in an embodiment of the present application. Figure 5 As shown, the braking method may include:

[0084] Step 501: Determine whether the braking power that can be recovered by the driving motor is greater than or equal to the braking power required by the vehicle. If so, proceed to step 502; if not, proceed to step 506.

[0085] Step 502: Based on the current electrical parameters of the battery, determine whether the braking power that can be recovered by the battery is greater than or equal to the braking power required for the entire vehicle. If so, proceed to step 503; if not, proceed to step 504.

[0086] When it is determined that the drive motor is sufficient to recover all the braking power, it is first determined whether the battery can recover the electrical energy corresponding to all the braking power from the drive motor.

[0087] Step 503: Control the driving motor to recover all braking power and convert the braking power into electrical energy to input into the battery.

[0088] If the battery can recover the electrical energy corresponding to all the braking power from the motor, then all the braking power will be converted into electrical energy and input into the battery.

[0089] Step 504: Controlling the activation of the resistance retarder and determining the recovery braking power of the resistance retarder, so that the braking power recovered by the driving motor is partially converted into electric energy and input into the battery, and then proceeding to step 505;

[0090] Step 505: If the battery still cannot recover the remaining electric energy converted from the braking power when the resistance value of the resistance retarder reaches the maximum, the range extender engine exhaust braking function is controlled to start, and the braking power recovered by the drive motor is reduced until the battery and the resistance retarder can completely receive or consume the electric energy converted by the drive motor. The remaining electric energy is the electric energy obtained by converting the driving motor to recover the braking power minus the electric energy consumed by the resistance retarder.

[0091] If the battery cannot recover all the electric energy converted from the braking power recovered by the drive motor, a resistor retarder is required to participate in the recovery of the braking power. That is, part of the electric energy converted from the braking power recovered by the drive motor is consumed by the electric brake retarder, and part is input into the battery. Converting part of the electric energy recovered by the drive motor into heat energy can avoid overcharging the battery. If the resistor retarder has reached its design limit and still cannot meet the electric brake recovery demand, that is, the battery and the resistor retarder are not enough to receive all the electric energy converted from the recovered braking power, it is necessary to start the exhaust brake function of the range extender engine, so that the braking power output by the drive motor is reduced, and at the same time, the braking power recovered by the drive motor can be reduced until the battery and the resistor retarder can completely consume the electric energy converted from the recovered braking power.

[0092] Step 506: Control to start the exhaust brake function of the range extender engine to reduce the braking power output by the drive motor.

[0093] If the braking power that the drive motor can recover is less than the required braking power of the vehicle, it is necessary to control the start of the range extender engine exhaust braking function, so that the braking power output by the drive motor will not be too large, and the converted electrical energy can be received by the battery and the resistor retarder.

[0094] In one implementation, the resistance retarder is a variable resistance retarder, and the regenerative braking power of the variable resistance retarder can be determined based on the resistance value of the variable resistance retarder, and the resistance value of the variable resistance retarder is determined based on at least part of the vehicle braking demand power, the maximum regenerative power of the battery, the maximum available power of the battery, the battery voltage and the maximum resistance value of the variable resistance retarder.

[0095] Specifically, the resistance value of the variable resistor retarder can be determined based on the following formula: resistance value = min ((brake demand power - battery maximum recovery power) / (battery maximum available power / battery voltage) 2 , maximum resistance of the variable resistor).

[0096] In other implementations, the braking control method may also include: if the difference between the vehicle's braking demand power and the maximum recovery power of the drive motor is less than a first threshold, or the difference between the vehicle's braking demand power and the available charging power of the battery is less than a second threshold, starting the range extender engine through generator control.

[0097] In order to ensure that the exhaust brake of the engine can be fully utilized in an emergency, the start and stop of the range extender also needs to consider the braking request. If the braking power is found to be large during the braking process, close to the maximum recovery power of the motor or close to the maximum available charging power of the battery, the engine is started by reverse starting the generator, and the engine is prepared to participate in the exhaust brake, and the range extender is prohibited from stopping when there is a high-power braking demand.

[0098] Figure 6 This is a schematic diagram of the control logic of the engine start control disclosed in the embodiment of the present application. Figure 6 As shown, in a specific implementation, the sum of the braking power that can be consumed by the battery and the variable resistor retarder, and the sum of the braking power that can be recovered by the drive motor and the electric brake retarder, the above two take the smaller value. If the braking demand power of the whole vehicle minus the above smaller value exceeds the set threshold, it is necessary to issue a range extender start demand instruction. In order to avoid frequent jumps in the range extender start demand instruction, the set threshold can be designed as a hysteresis loop, and the set threshold is related to the brake pedal opening and the brake pedal opening change rate.

[0099] The braking control scheme described in the embodiment of the present application includes a resistance retarder and an electric brake retarder in the corresponding braking system. The two retarders can be used selectively based on actual conditions. The electric brake retarder can improve the recovery power when the motor braking power is limited, thereby improving the economy of the whole vehicle. The resistance retarder can improve the braking performance when the battery charging power is limited. The resistance retarder is set as a variable resistance retarder, which can take into account part of the economy. The combination of the two can not only optimize the braking performance, but also improve the economy of the whole vehicle. Through the technical solution of the present application, under the premise of ensuring the braking demand, the mechanical wear of the traditional brake can be reduced as much as possible, and the braking energy can be recovered to the maximum extent, thereby improving the economy of the system.

[0100] For the aforementioned method embodiments, for the sake of simplicity, they are all described as a series of action combinations, but those skilled in the art should be aware that the present application is not limited by the order of the actions described, because according to the present application, some steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

[0101] The method is described in detail in the embodiments disclosed in the above-mentioned application. The method of the application can be implemented by various forms of devices. Therefore, the application also discloses a device, and a specific embodiment is given below for detailed description.

[0102] Figure 7 This is a schematic diagram of the structure of the brake control device disclosed in an embodiment of the present application. Figure 7 The brake control device shown can be applied to the brake system disclosed in the above embodiments. Figure 7 As shown, the brake control device 70 may include:

[0103] The power acquisition module 701 is used to obtain the braking power required by the vehicle.

[0104] The power determination module 702 is used to determine the braking power that can be recovered by the battery based on the current electrical parameters of the battery.

[0105] The demand judgment module 703 is used to determine whether the driving motor meets the braking demand when the braking power that can be recovered by the battery is greater than or equal to the braking demand power of the whole vehicle.

[0106] The first control module 704 is used to control the driving motor to provide the vehicle braking demand power when the judgment result of the demand judgment module is yes.

[0107] The second control module 705 is used to control the drive motor and the electric brake retarder to jointly provide the vehicle braking power requirement when the judgment result of the demand judgment module is no.

[0108] The braking control device described in this embodiment, based on the drive motor and the electric brake retarder, can effectively meet the braking demand. At the same time, the existence of the drive motor and the electric brake buffer provides the possibility of diversified recovery of braking power, which can improve the overall system economy.

[0109] The specific implementation of the above-mentioned braking control device and the modules it contains can be found in the corresponding parts of the method embodiment, which will not be repeated here.

[0110] The braking control device in the above embodiment includes a processor and a memory. The power acquisition module, power determination module, demand judgment module, first control module, second control module, etc. in the above embodiment are all stored in the memory as program modules, and the processor executes the above program modules stored in the memory to realize corresponding functions.

[0111] The processor includes a kernel, which retrieves the corresponding program module from the memory. One or more kernels can be set, and the processing of the access data can be realized by adjusting the kernel parameters.

[0112] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0113] In an exemplary embodiment, a computer-readable storage medium is also provided, which can be directly loaded into the internal memory of a computer and contains software codes. After being loaded and executed by a computer, the computer program can implement the steps shown in any embodiment of the above-mentioned braking control method.

[0114] In an exemplary embodiment, a computer program product is also provided, which can be directly loaded into the internal memory of a computer and contains software codes. After being loaded and executed by a computer, the computer program can implement the steps shown in any embodiment of the braking control method described above.

[0115] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0116] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0117] The steps of the method or algorithm described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0118] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A braking system for an extended-range vehicle, characterized in that: include: A main reducer connected to a driving motor; A resistance retarder connected to the drive motor and used to consume part of the electric energy converted from the braking power recovered by the drive motor; An electric brake retarder, arranged on the connection channel between the drive motor and the main reducer, and connected to the battery through a DC converter, for providing braking power and / or absorbing braking power; If the braking power that can be recovered by the drive motor is greater than or equal to the braking power required by the vehicle, determine whether the braking power that can be recovered by the battery is greater than or equal to the braking power required by the vehicle based on the current electrical parameters of the battery; If the braking power that can be recovered by the battery is greater than or equal to the braking power required by the vehicle, control the drive motor to recover all the braking power and convert the braking power into electrical energy and input it into the battery; If the braking power that can be recovered by the battery is less than the braking power required by the whole vehicle, the resistance retarder is controlled to be enabled and the braking power recovered by the resistance retarder is determined, so that the braking power recovered by the drive motor is partially converted into electric energy and input into the battery; if the battery still cannot recover the remaining electric energy obtained by the braking power conversion when the resistance value of the resistance retarder reaches the maximum, the exhaust braking function of the range extender engine is controlled to be started, and the braking power recovered by the drive motor is reduced until the battery and the resistance retarder can completely receive or consume the electric energy converted by the drive motor; If the braking power that can be recovered by the drive motor is less than the required braking power of the whole vehicle, the exhaust braking function of the range extender engine is controlled to be started to reduce the braking power output by the drive motor.

2. The braking system of the extended-range vehicle according to claim 1, characterized in that: The resistance retarder is a variable resistance retarder.

3. The braking system of the extended-range vehicle according to claim 1, characterized in that: The electric brake retarder is an eddy current retarder.

4. A braking control method, applied to the braking system of the extended-range vehicle according to any one of claims 1 to 3, characterized in that: include: Obtain the braking power required by the vehicle; Determine the braking power that the battery can recover based on the current electrical parameters of the battery; If the braking power that can be recovered by the battery is greater than or equal to the braking power required by the vehicle, determining whether the drive motor meets the braking demand; If yes, controlling the driving motor to provide the required braking power of the whole vehicle; If not, the driving motor and the electric brake retarder are controlled to jointly provide the required braking power of the whole vehicle.

5. The braking control method according to claim 4, characterized in that: The control method comprises: the driving motor and the electric brake retarder jointly provide the required braking power of the whole vehicle, including: Determining whether the power that can be provided by the driving motor and the electric brake retarder acting together can meet the braking power requirement of the whole vehicle; If yes, determining a first braking power required to be provided by the driving motor and a second braking power required to be provided by the electric braking retarder based on efficiency curves of the driving motor and the electric braking retarder, wherein the sum of the first braking power and the second braking power is equal to the braking power requirement of the whole vehicle; If not, the control starts the exhaust brake function of the range extender engine.

6. The braking control method according to claim 5, characterized in that: The control of starting the range extender engine exhaust brake function includes: If the exhaust brake power of the range extender engine can be set, the exhaust brake power of the range extender engine is set based on the difference between the vehicle braking demand power and the sum of the braking powers output by the drive motor and the electric brake retarder, and the exhaust brake function is started; If the exhaust braking power of the range extender engine cannot be set, the exhaust braking power of the range extender engine is determined based on the current engine speed, and the exhaust braking function is started; the differential braking power between the vehicle braking demand power and the exhaust braking power is controlled to be provided by the drive motor first; when the braking power that the drive motor can provide is lower than the differential braking power, the electric brake retarder is controlled to provide the remaining braking power, and the remaining braking power is the difference between the differential braking power and the braking power provided by the drive motor.

7. The braking control method according to claim 4, characterized in that: The resistance retarder is a variable resistance retarder, and the recovery braking power of the variable resistance retarder is determined based on the resistance value of the variable resistance retarder. The resistance value of the variable resistance retarder is determined based on at least part of the vehicle braking demand power, the maximum recovery power of the battery, the maximum available power of the battery, the battery voltage and the maximum resistance value of the variable resistance retarder.

8. The brake control method according to claim 4, characterized in that: Also includes: If the difference between the vehicle braking power requirement and the maximum recovery power of the drive motor is less than a first threshold, or the difference between the vehicle braking power requirement and the available charging power of the battery is less than a second threshold, the range extender engine is started through generator control.

9. A brake control device, applied to the brake system of the extended-range vehicle according to any one of claims 1 to 3, characterized in that: include: A power acquisition module is used to obtain the braking power required by the vehicle; A power determination module, used to determine the braking power that can be recovered by the battery based on the current electrical parameters of the battery; A demand judgment module, used to determine whether the drive motor meets the braking demand when the braking power that can be recovered by the battery is greater than or equal to the braking power required by the vehicle; A first control module, configured to control the drive motor to provide the required braking power of the vehicle when the judgment result of the demand judgment module is yes; The second control module is used to control the drive motor and the electric brake retarder to jointly provide the vehicle braking demand power when the judgment result of the demand judgment module is no.

Images