Steep slope gentle descent pre-control method and device

Abstract

The application discloses a steep slope slow descending pre-control method and device, which is applied to a scene where a steep slope slow descending function is started, and the method comprises the following steps: acquiring vehicle driving state information, establishing a steep slope slow descending pre-control condition and a steep slope slow descending activation condition, the steep slope slow descending pre-control condition comprising a first vehicle speed requirement, a first slope requirement and a first accelerator pedal requirement, the first accelerator pedal requirement representing that an accelerator pedal is in an incomplete release state, comparing the vehicle driving state information with the steep slope slow descending pre-control condition, pre-filling brake pressure into a brake system when the vehicle driving state information meets the steep slope slow descending pre-control condition, and comparing the vehicle driving state information with the steep slope slow descending activation condition, and braking the vehicle through active pressure building on the basis of the pre-filled brake pressure when the vehicle driving state information meets the steep slope slow descending activation condition. The application can brake the vehicle in time, and improves the driving safety of a driver.

Description

Technical Field

[0001] This invention relates to the field of automotive braking technology, and in particular to a method and apparatus for hill descent control. Background Technology

[0002] Hill Descent Control is mainly used for steep or continuous downhill driving conditions. The driver can release the accelerator and brake pedals and use ESC active pressure build-up and other methods to brake the vehicle, so that the vehicle can maintain the target speed and pass through the downhill road smoothly. After the Hill Descent Control is activated, the driver does not need to operate the brake pedal.

[0003] When the slope is steep or the acceleration before hill descent control is activated is high, engine braking or electric motor energy recovery is insufficient to control the vehicle's speed, requiring intervention from hydraulic friction braking systems such as ESC to decelerate the vehicle. However, intervention from hydraulic friction braking systems like ESC usually requires the accelerator pedal to be fully released, and after intervention, deceleration generally requires eliminating the play between the brake discs. The time required for the accelerator pedal to be fully released and for the play to be eliminated means that the vehicle speed does not decrease promptly after hill descent control is activated, but rather continues to increase. This continued acceleration, especially at higher speeds, can negatively impact the driver's sense of safety. Summary of the Invention

[0004] The embodiments of this application provide a method and apparatus for pre-controlling steep slope descent. By establishing pre-filled brake hydraulic pressure, the pressure build-up time after the steep slope descent is activated is shortened, so that the vehicle can be braked in a timely manner after the steep slope descent function is activated, thereby improving the driver's driving safety.

[0005] Other features and advantages of this application will become apparent from the following detailed description, or may be learned in part from practice of this application.

[0006] According to a first aspect of the embodiments of this application, a steep slope descent pre-control method is provided, applied to scenarios where the steep slope descent function is activated, including:

[0007] Obtain vehicle driving status information, including vehicle speed, slope, and accelerator pedal release status;

[0008] Establish steep slope descent pre-control conditions and steep slope descent activation conditions. The steep slope descent pre-control conditions include a first vehicle speed requirement, a first gradient requirement, and a first accelerator pedal requirement. The first accelerator pedal requirement indicates that the accelerator pedal is not fully released.

[0009] Compare the vehicle driving status information with the steep slope descent pre-control conditions. When the vehicle driving status information meets the steep slope descent pre-control conditions, pre-fill the braking pressure into the braking system.

[0010] By comparing vehicle driving status information with hill descent control activation conditions, when the vehicle driving status information meets the hill descent control activation conditions, the vehicle is braked by actively building up pressure based on the pre-filled braking pressure.

[0011] In some embodiments of this application, based on the aforementioned scheme, the function corresponding to the steep slope descent pre-control method can be used as a sub-function option of steep slope descent, which can be selected by the driver to enable or disable.

[0012] In some embodiments of this application, based on the aforementioned scheme, the first vehicle speed requirement indicates that the vehicle speed is between the first vehicle speed lower limit and the first vehicle speed upper limit, and the first slope requirement indicates that the slope is greater than the first slope lower limit.

[0013] In some embodiments of this application, based on the foregoing scheme, the steep slope descent activation conditions include:

[0014] The second speed requirement indicates that the vehicle speed is between the second lower speed limit and the second upper speed limit;

[0015] The second slope requirement indicates that the slope is between the lower limit of the second slope and the upper limit of the second slope;

[0016] The second accelerator pedal requirement indicates that the accelerator pedal is in a fully released state;

[0017] The second brake pedal requirement indicates that the brake pedal is in a fully released state.

[0018] In some embodiments of this application, based on the aforementioned scheme, the second vehicle speed lower limit is less than the first vehicle speed lower limit.

[0019] In some embodiments of this application, based on the aforementioned scheme, the second vehicle speed limit is equal to the first vehicle speed limit.

[0020] In some embodiments of this application, based on the aforementioned scheme, the second lower slope limit is less than the first lower slope limit.

[0021] In some embodiments of this application, based on the aforementioned scheme, the greater the vehicle speed and / or gradient, the greater the pre-filled braking pressure.

[0022] In some embodiments of this application, based on the aforementioned scheme, the pre-filled braking pressure is greater than the first lower pressure limit and less than the first upper pressure limit.

[0023] In some embodiments of this application, based on the foregoing scheme, the following further methods are also included:

[0024] Obtain the exit conditions for the pre-control of steep slope descent;

[0025] After pre-filling the braking system with braking pressure, the pre-filled braking pressure is released when the vehicle's driving status information meets the conditions for exiting the hill descent control pre-control.

[0026] In some embodiments of this application, based on the aforementioned scheme, the pre-control exit condition for hill descent is that the hill descent function is turned off, or the vehicle speed does not meet the first vehicle speed requirement, or the slope does not meet the first slope requirement, or the driver operates the brake pedal.

[0027] In some embodiments of this application, braking pressure can be pre-filled into the braking system before the accelerator pedal is fully released, so that the pressure build-up time is shortened after the hill descent control function is activated, and the vehicle can be braked in time, improving the driver's driving safety.

[0028] According to a second aspect of the embodiments of this application, a steep slope descent pre-control device is provided, applied to scenarios where the steep slope descent function is activated, the device comprising:

[0029] The acquisition unit acquires vehicle driving status information, including vehicle speed, slope, and accelerator pedal release status.

[0030] A unit is established to establish steep slope descent pre-control conditions and steep slope descent activation conditions. The steep slope descent pre-control conditions include a first vehicle speed requirement, a first gradient requirement, and a first accelerator pedal requirement. The first accelerator pedal requirement indicates that the accelerator pedal is in a state of not being fully released.

[0031] The filling unit compares the vehicle driving status information with the steep slope descent pre-control conditions. When the vehicle driving status information meets the steep slope descent pre-control conditions, the braking pressure is pre-filled into the braking system.

[0032] The braking unit compares the vehicle's driving status information with the hill descent control activation conditions. When the vehicle's driving status information meets the hill descent control activation conditions, it actively applies pressure to the vehicle to brake, based on the pre-filled braking pressure.

[0033] In some embodiments of this application, based on the foregoing scheme, the establishment unit is configured as follows: the first vehicle speed requirement indicates that the vehicle speed is between the first vehicle speed lower limit and the first vehicle speed upper limit, and the first slope requirement indicates that the slope is greater than the first slope lower limit.

[0034] In some embodiments of this application, based on the foregoing scheme, the establishment unit is configured such that the steep slope descent activation conditions include:

[0035] The second speed requirement indicates that the vehicle speed is between the second lower speed limit and the second upper speed limit;

[0036] The second slope requirement indicates that the slope is between the lower limit of the second slope and the upper limit of the second slope;

[0037] The second accelerator pedal requirement indicates that the accelerator pedal is in a fully released state;

[0038] The second brake pedal requirement indicates that the brake pedal is in a fully released state.

[0039] In some embodiments of this application, based on the aforementioned scheme, the establishing unit is configured such that the second vehicle speed lower limit is less than the first vehicle speed lower limit.

[0040] In some embodiments of this application, based on the foregoing scheme, the establishing unit is configured such that the second vehicle speed limit is equal to the first vehicle speed limit.

[0041] In some embodiments of this application, based on the foregoing scheme, the establishment unit is configured such that the second lower slope limit is less than the first lower slope limit.

[0042] In some embodiments of this application, based on the foregoing scheme, the filling unit is configured such that the pre-filled braking pressure is greater than a first lower pressure limit and less than a first upper pressure limit.

[0043] In some embodiments of this application, based on the foregoing scheme, the following further methods are also included:

[0044] The first acquisition unit acquires the exit conditions for the steep slope descent pre-control.

[0045] The elimination unit eliminates the pre-filled braking pressure after pre-filling the braking system, when the vehicle driving status information meets the conditions for exiting the hill descent control pre-control.

[0046] In some embodiments of this application, based on the foregoing scheme, the first acquisition unit is configured such that the steep slope descent pre-control exit condition is that the steep slope descent function is turned off, or the vehicle speed does not meet the first vehicle speed requirement, or the slope does not meet the first slope requirement, or the driver operates the brake pedal.

[0047] According to a third aspect of the present application, a computer-readable storage medium is provided, on which a computer program is stored, the computer program including executable instructions that, when executed by a processor, implement the method described in any of the embodiments of the first aspect.

[0048] According to a fourth aspect of the present application, an electronic device is provided, comprising: one or more processors; and a memory for storing executable instructions of the processors, wherein when the executable instructions are executed by the one or more processors, the one or more processors cause the one or more processors to implement the method described in any embodiment of the first aspect above.

[0049] The beneficial effects of the embodiments of the second to fourth aspects described above can be referred to the beneficial effects of the first aspect and the embodiments of the first aspect described above, and will not be repeated here.

[0050] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0051] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings:

[0052] Figure 1 A flowchart of the steep slope descent pre-control method in an embodiment of this application is shown;

[0053] Figure 2 A schematic diagram of step S3 in an embodiment of this application is shown;

[0054] Figure 3 This paper presents a first comparative schematic diagram of a steep slope descent pre-control and a steep slope descent without control in an embodiment of this application;

[0055] Figure 4 This illustration shows a second comparative diagram of embodiments of this application with and without steep slope descent control.

[0056] Figure 5 A block diagram of the steep slope descent pre-control device in an embodiment of this application is shown;

[0057] Figure 6 This is a schematic diagram of a computer-readable storage medium according to an embodiment of the present invention;

[0058] Figure 7 This is a schematic diagram of the system structure of an electronic device according to an embodiment of the present invention. Detailed Implementation

[0059] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0060] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0061] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0062] The flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content and operations / steps, nor do they necessarily have to be performed in the described order. For example, some operations / steps can be broken down, while others can be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.

[0063] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "multiple" means two or more.

[0064] Figure 1 A flowchart of a steep slope descent pre-control method according to an embodiment of this application is shown. The steep slope descent pre-control method can be executed by a device with computational processing capabilities.

[0065] See Figure 1 This application provides a steep slope descent pre-control method, applicable to scenarios where the steep slope descent function is activated, including at least S1 to S4, detailed as follows:

[0066] In step S1, vehicle driving status information is obtained, including vehicle speed, gradient, and accelerator pedal release status.

[0067] Specifically, the vehicle speed can be acquired by wheel speed sensors, and the vehicle speed acquired by the wheel speed sensors can be processed by the ESC system for easy reading and comparison. The gradient can be acquired by gradient sensors or calculated from the acceleration signal acquired by acceleration sensors. The calculation process can be performed by the ESC system or by other controllers. The accelerator pedal release state can be determined by the accelerator pedal opening acquired by the accelerator pedal sensor. An accelerator pedal opening greater than 0 but less than 100% indicates that the accelerator pedal release state is not fully released, and an accelerator pedal opening of 0 indicates that the accelerator pedal release state is fully released. The accelerator pedal opening acquired by the accelerator pedal sensor can be sent to the ESC system via the vehicle CAN bus.

[0068] In step S2, steep slope descent pre-control conditions and steep slope descent activation conditions are established. The steep slope descent pre-control conditions include a first vehicle speed requirement, a first gradient requirement, and a first accelerator pedal requirement. The first accelerator pedal requirement indicates that the accelerator pedal is in a state of not being fully released.

[0069] Specifically, the first vehicle speed requirement indicates the vehicle speed requirement, the first gradient requirement indicates the gradient requirement of the road surface on which the vehicle travels, and the first accelerator pedal requirement indicates the requirement regarding the accelerator pedal release state.

[0070] In step S3, the vehicle driving status information and the hill descent control pre-control conditions are compared. When the vehicle driving status information meets the hill descent control pre-control conditions, the braking pressure is pre-filled into the braking system.

[0071] Specifically, the system compares vehicle driving status information with hill descent control pre-control conditions. If the vehicle driving status information meets the hill descent control pre-control conditions (i.e., the vehicle speed meets the first speed requirement, the gradient meets the first gradient requirement, and the accelerator pedal release state meets the first accelerator pedal requirement), then brake pressure is pre-filled into the braking system. If the vehicle driving status information does not meet the hill descent control pre-control conditions, then no pre-filling of brake pressure into the braking system is performed. Pre-filling brake pressure into the braking system can eliminate disc / pad clearance and pre-control hill descent.

[0072] In step S4, the vehicle driving status information and the hill descent control activation conditions are compared. When the vehicle driving status information meets the hill descent control activation conditions, the vehicle is braked by actively building up pressure based on the pre-filled braking pressure.

[0073] Specifically, after pre-controlling the steep slope descent, when the vehicle's driving status information meets the activation conditions for steep slope descent, active pressure building is performed through the ESC system to apply braking to the vehicle, control the actual vehicle speed to maintain the target speed for steep slope descent, and maintain a stable speed to pass through the downhill road surface.

[0074] It is understandable that when the steep slope descent function is turned off, the corresponding function of the steep slope descent pre-control method is unavailable.

[0075] In this application, the first vehicle speed requirement indicates that the vehicle speed is between a first lower limit and a first upper limit, and the first gradient requirement indicates that the gradient is greater than the first lower limit.

[0076] Specifically, the first speed limit, the first speed limit, and the first gradient limit can be set according to actual needs, such as according to vehicle type. The first speed limit can be set to 15-25 km / h, the first speed limit can be set to 30-35 km / h, and the first gradient limit can be set to 15%.

[0077] In this application, the steep slope descent activation conditions include:

[0078] The second speed requirement indicates that the vehicle speed is between the second lower speed limit and the second upper speed limit;

[0079] The second slope requirement indicates that the slope is between the lower limit of the second slope and the upper limit of the second slope;

[0080] The second accelerator pedal requirement indicates that the accelerator pedal is in a fully released state;

[0081] The second brake pedal requirement indicates that the brake pedal is in a fully released state.

[0082] Specifically, hill descent control is activated when the vehicle speed meets the second speed requirement, the gradient meets the second gradient requirement, the accelerator pedal meets the second accelerator pedal requirement, and the brake pedal meets the second brake pedal requirement. At this time, neither the accelerator nor the brake pedal is depressed and both are in a fully released state. The lower limit of the second speed can be set to 2-8 km / h, the upper limit of the second speed can be equal to the upper limit of the first speed, the upper limit of the second speed can be set to 30-35 km / h, the lower limit of the second gradient can be set to 10%, and the upper limit of the second gradient can be set to 50-60%.

[0083] In this application, the second lower limit of vehicle speed is lower than the first lower limit of vehicle speed, and the second lower limit of gradient is lower than the first lower limit of gradient. Compared with the steep slope descent activation condition, the lower limits of vehicle speed and gradient of the steep slope descent pre-control condition are higher. This controls the steep slope descent pre-control to be triggered when necessary, avoiding frequent triggering of the steep slope descent pre-control function, which would cause the modules performing the steep slope descent pre-control function, such as solenoid valves and motors, to operate frequently and affect their service life.

[0084] Specifically, when the vehicle speed is less than the first lower speed limit and greater than the second lower speed limit, if the accelerator pedal is not fully released, the hill descent control function and the hill descent pre-control function will not be activated. If the accelerator pedal is fully released, the hill descent control function will be activated. When the vehicle speed is greater than or equal to the first lower speed limit and less than or equal to the first upper speed limit, if the accelerator pedal is not fully released, the hill descent control function will not be activated, but the hill descent pre-control function will be activated. If the accelerator pedal is fully released, the hill descent control function will be activated.

[0085] In this application, the greater the vehicle speed and / or gradient, the greater the pre-filled braking pressure. The pre-filled braking pressure can be adjusted according to the vehicle speed and / or gradient. The pre-filled braking pressure is greater than the first lower pressure limit and less than the first upper pressure limit. The first lower pressure limit and the first upper pressure limit can be set according to the actual situation. They can be set to be relatively small to avoid dragging and affecting the vehicle's acceleration performance. The first lower pressure limit can be set to 1 bar and the first upper pressure limit can be set to 5 bar.

[0086] This application also includes:

[0087] Obtain the exit conditions for the pre-control of steep slope descent;

[0088] After pre-filling the braking system with braking pressure, the pre-filled braking pressure is released when the vehicle's driving status information meets the conditions for exiting the hill descent control pre-control.

[0089] Specifically, the pre-control exit condition for the steep slope descent is that the steep slope descent function is turned off, the vehicle speed does not meet the first vehicle speed requirement, the slope does not meet the first slope requirement, or the driver operates the brake pedal.

[0090] Figure 2 A schematic diagram of step S3 in an embodiment of this application is shown. See also Figure 2 In the above embodiment, step S3 can be performed in steps, as follows:

[0091] S31: Compare the vehicle speed with the first speed requirement. If the vehicle speed meets the first speed requirement, proceed to S32; otherwise, return to S1.

[0092] S32: Compare the slope with the first slope requirement. If the slope meets the first slope requirement, proceed to S33; otherwise, return to S1.

[0093] S33: Compare the accelerator pedal release state with the first accelerator pedal requirement. If the accelerator pedal is not fully released and the accelerator pedal release state meets the first accelerator pedal requirement, proceed to S34. If not, return to S1.

[0094] S34: Pre-fill the braking pressure into the braking system. If the vehicle driving status information meets the hill descent control pre-control exit condition, the pre-filled braking pressure is eliminated and the system returns to S1. If not, when the vehicle driving status information meets the hill descent activation condition, the hill descent function is activated and the vehicle is braked.

[0095] It should be understood that the order of S31, S32 and S33 can be changed, which is not restricted here and will not affect the implementation of the function.

[0096] To better understand this embodiment, Figure 3 This illustration shows a first comparative diagram of steep slope descent pre-control and steep slope descent without control in an embodiment of this application. Figure 4 This illustration shows a second comparative diagram of embodiments of this application, illustrating the difference between steep slope descent pre-control and the absence of steep slope descent control. Figure 3 and Figure 4 In the diagram, the horizontal axis represents time, and the vertical axis represents the hydraulic filling volume.

[0097] See Figure 3 Compared to hill descent control without pre-control, hill descent control with pre-control reaches its peak hydraulic pressure earlier, significantly shortening the pressure build-up time after hill descent control activation. This allows for faster vehicle braking because pre-filling the braking system with braking pressure eliminates the disc-pad clearance, i.e., the free travel clearance between the friction pads and the brake disc. When the accelerator pedal is fully released, hill descent control is activated, further building braking pressure within the braking system to achieve hill descent control. This prevents the actual vehicle speed from continuing to increase relative to the target speed after hill descent control is activated, thus ensuring driver safety.

[0098] See Figure 4 When the pre-control conditions for hill descent are met, the braking pressure is pre-filled to the braking system to eliminate the free play between the friction pads and the brake disc. If the vehicle speed and the gradient do not meet the first speed requirement or the first gradient requirement, the pre-control exit condition is met, and the hill descent pre-control is exited. The pre-filled braking pressure is released, and the friction pads, driven by the high-speed rotating brake disc, move away from the brake disc to maintain the disc-pad clearance.

[0099] Understandably, pre-filling the brake pressure and further building up the brake pressure can be done via a brake-by-wire actuator.

[0100] In summary, when the accelerator pedal is not fully released, braking pressure can be pre-filled into the braking system to eliminate disc clearance. This shortens the pressure build-up time after the hill descent control function is activated, enabling timely braking of the vehicle and improving the driver's sense of driving safety.

[0101] Figure 5 A block diagram of the steep slope descent pre-control device in an embodiment of this application is shown. See also: Figure 5 According to a second aspect of the embodiments of this application, a steep slope descent pre-control device 100 is provided, applied to scenarios where the steep slope descent function is activated. The device includes:

[0102] The acquisition unit 101 acquires vehicle driving status information, including vehicle speed, gradient, and accelerator pedal release status. The acquisition unit 101 can be integrated into the ESC system and acquires vehicle driving status information through signal acquisition and communication.

[0103] Establishment unit 102 establishes steep slope descent pre-control conditions and steep slope descent activation conditions. The steep slope descent pre-control conditions include a first vehicle speed requirement, a first slope requirement, and a first accelerator pedal requirement. The first accelerator pedal requirement indicates that the accelerator pedal is in a state of not being fully released.

[0104] Filling unit 103 compares vehicle driving status information with hill descent control pre-control conditions. The module that performs the comparison of vehicle driving status information and hill descent control pre-control conditions can be integrated into the ESC system to determine whether the vehicle driving status information meets the hill descent control pre-control conditions. When the vehicle driving status information meets the hill descent control pre-control conditions, the braking pressure is pre-filled into the braking system. The module that performs the pre-filling of braking pressure into the braking system may include an ESC actuator, pipeline and wheel caliper. The ESC actuator may include a motor, solenoid valve and eccentric pump, or it may include a motor, reduction mechanism and servo cylinder.

[0105] The braking unit 104 compares the vehicle driving status information with the hill descent control activation conditions. When the vehicle driving status information meets the hill descent control activation conditions, it brakes the vehicle by actively building up pressure based on the pre-filled braking pressure.

[0106] In this application, the establishment unit is configured such that: the first vehicle speed requirement indicates that the vehicle speed is between the first vehicle speed lower limit and the first vehicle speed upper limit, and the first slope requirement indicates that the slope is greater than the first slope lower limit.

[0107] In this application, the establishment unit is configured such that the steep slope descent activation conditions include:

[0108] The second speed requirement indicates that the vehicle speed is between the second lower speed limit and the second upper speed limit;

[0109] The second slope requirement indicates that the slope is between the lower limit of the second slope and the upper limit of the second slope;

[0110] The second accelerator pedal requirement indicates that the accelerator pedal is in a fully released state;

[0111] The second brake pedal requirement indicates that the brake pedal is in a fully released state.

[0112] In this application, the establishment unit is configured such that the second vehicle speed lower limit is less than the first vehicle speed lower limit.

[0113] In this application, the establishment unit is configured such that the second vehicle speed limit is equal to the first vehicle speed limit.

[0114] In this application, the establishment unit is configured such that the second lower slope limit is less than the first lower slope limit.

[0115] In this application, the filling unit is configured such that the pre-filled braking pressure is greater than a first lower pressure limit and less than a first upper pressure limit.

[0116] This application also includes:

[0117] The first acquisition unit acquires the exit conditions for the steep slope descent pre-control.

[0118] The elimination unit eliminates the pre-filled braking pressure after pre-filling the braking system, when the vehicle driving status information meets the conditions for exiting the hill descent control pre-control.

[0119] In this application, the first acquisition unit is configured such that the steep slope descent pre-control exit condition is that the steep slope descent function is turned off, or the vehicle speed does not meet the first vehicle speed requirement, or the slope does not meet the first slope requirement, or the driver operates the brake pedal.

[0120] Based on the same inventive concept, as a third aspect, this application also provides a computer-readable storage medium storing a program product capable of implementing the steep slope descent pre-control method described above. In some possible embodiments, various aspects of this application can also be implemented as a program product comprising program code that, when run on a terminal device, causes the terminal device to perform the steps described in the "Exemplary Methods" section of this specification according to the various exemplary embodiments of this application.

[0121] refer to Figure 6As shown, a program product 200 for implementing the above-described method according to an embodiment of this application is described. It may employ a portable compact disc read-only memory (CD-ROM) and include program code, and can run on a terminal device, such as a personal computer. However, the program product of this application is not limited thereto. In this document, a readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

[0122] The program product may employ any combination of one or more readable media. A readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of readable storage media (a non-exhaustive list) include: an electrical connection having one or more wires, a portable disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0123] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, carrying readable program code. Such propagated data signals may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. A readable signal medium may also be any readable medium other than a readable storage medium, capable of sending, propagating, or transmitting programs for use by or in conjunction with an instruction execution system, apparatus, or device.

[0124] The program code contained on the readable medium may be transmitted using any suitable medium, including but not limited to wireless, wired, optical fiber, RF, etc., or any suitable combination thereof.

[0125] Program code for performing the operations of this application can be written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Java and C++, and conventional procedural programming languages ​​such as C or similar languages. The program code can execute entirely on the user's computing device, partially on the user's device, as a standalone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server. In cases involving remote computing devices, the remote computing device can be connected to the user's computing device via any type of network, including a local area network (LAN) or a wide area network (WAN), or it can be connected to an external computing device (e.g., via the Internet using an Internet service provider).

[0126] In another respect, this application also provides an electronic device capable of implementing the above-described method.

[0127] Those skilled in the art will understand that various aspects of this application can be implemented as a system, method, or program product. Therefore, various aspects of this application can be specifically implemented in the following forms: a completely hardware implementation, a completely software implementation (including firmware, microcode, etc.), or a combination of hardware and software implementations, collectively referred to herein as a "circuit," "module," or "system."

[0128] The following reference Figure 7 To describe an electronic device 300 according to this embodiment of the present application. Figure 7 The electronic device 300 shown is merely an example and should not impose any limitations on the functionality and scope of use of the embodiments of this application.

[0129] like Figure 7 As shown, the electronic device 300 is manifested in the form of a general-purpose computing device. The components of the electronic device 300 may include, but are not limited to: at least one processing unit 310, at least one storage unit 320, and a bus 330 connecting different system components (including storage unit 320 and processing unit 310).

[0130] The storage unit stores program code that can be executed by the processing unit 310, causing the processing unit 310 to perform the steps described in the "Embodiment Methods" section above according to various exemplary embodiments of this application.

[0131] Storage unit 320 may include readable media in the form of volatile storage units, such as random access memory (RAM) 321 and / or cache memory 322, and may further include read-only memory (ROM) 323.

[0132] Storage unit 320 may also include a program / utility 324 having a set (at least one) of program modules 325, including but not limited to: an operating system, one or more application programs, other program modules, and program data, each or some combination of these examples may include an implementation of a network environment.

[0133] Bus 330 can represent one or more of several types of bus structures, including a memory cell bus or memory cell controller, a peripheral bus, a graphics acceleration port, a processing unit, or a local bus using any of the various bus structures.

[0134] Electronic device 300 can also communicate with one or more external devices 400 (e.g., keyboard, pointing device, Bluetooth device, etc.), and with one or more devices that enable a user to interact with electronic device 300, and / or with any device that enables electronic device 300 to communicate with one or more other computing devices (e.g., router, modem, etc.). This communication can be performed via input / output (I / O) interface 350. Furthermore, electronic device 300 can also communicate with one or more networks (e.g., local area network (LAN), wide area network (WAN), and / or public networks, such as the Internet) via network adapter 360. As shown, network adapter 360 communicates with other modules of electronic device 300 via bus 330. It should be understood that, although not shown in the figures, other hardware and / or software modules can be used in conjunction with electronic device 300, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0135] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored as one or more instructions or codes on or transmitted via a computer-readable medium. Other examples and embodiments are within the scope and spirit of this application and the appended claims. For example, due to the nature of software, the functions described above may be implemented using software executed by a processor, hardware, firmware, hardwired, or any combination thereof. Furthermore, the functional units may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit.

[0136] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0137] The units described as separate components may or may not be physically separate. Similarly, the components of the control device may or may not be physical units; they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment, depending on actual needs.

[0138] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, read-only memory (ROM), random access memory (RAM), portable hard drive, magnetic disk, or optical disk.

[0139] The above description is merely an embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A steep slope descent pre-control method, applied to scenarios where steep slope descent function is activated, characterized in that, include: Obtain vehicle driving status information, including vehicle speed, slope, and accelerator pedal release status; Establish steep slope descent pre-control conditions and steep slope descent activation conditions. The steep slope descent pre-control conditions include a first vehicle speed requirement, a first gradient requirement, and a first accelerator pedal requirement. The first accelerator pedal requirement indicates that the accelerator pedal is not fully released. The first vehicle speed requirement indicates that the vehicle speed is between the first lower limit and the first upper limit; the steep slope descent activation conditions include the second vehicle speed requirement, the second accelerator pedal requirement, and the second brake pedal requirement. The second speed requirement indicates that the vehicle speed is between the second lower speed limit and the second upper speed limit; The second accelerator pedal requirement indicates that the accelerator pedal is in a fully released state; The second brake pedal requirement indicates that the brake pedal is in a fully released state; the second vehicle speed limit is less than the first vehicle speed limit. The vehicle driving status information is compared with the hill descent control pre-control conditions. When the vehicle driving status information meets the hill descent control pre-control conditions, the braking pressure is pre-filled into the braking system. The greater the vehicle speed and / or the slope, the greater the pre-filled braking pressure. The pre-filled braking pressure is greater than the first lower pressure limit and less than the first upper pressure limit to avoid dragging and affecting the vehicle's acceleration performance. By comparing vehicle driving status information with hill descent control activation conditions, when the vehicle driving status information meets the hill descent control activation conditions, the vehicle is braked by actively building up pressure based on the pre-filled braking pressure.

2. The steep slope descent pre-control method according to claim 1, characterized in that, The first slope requirement indicates that the slope is greater than the first slope lower limit.

3. The steep slope descent pre-control method according to claim 2, characterized in that, The steep slope descent activation conditions also include: The second slope requirement indicates that the slope is between the lower limit of the second slope and the upper limit of the second slope.

4. The steep slope descent pre-control method according to claim 3, characterized in that, The second speed limit is equal to the first speed limit.

5. The steep slope descent pre-control method according to claim 3, characterized in that, The second lower limit of the slope is less than the first lower limit of the slope.

6. The steep slope descent pre-control method according to claim 1, characterized in that, Also includes: Obtain the exit conditions for the pre-control of steep slope descent; After pre-filling the braking system with braking pressure, the pre-filled braking pressure is released when the vehicle's driving status information meets the conditions for exiting the hill descent control pre-control.

7. The steep slope descent pre-control method according to claim 6, characterized in that, The conditions for exiting the hill descent control pre-control are: the hill descent function is turned off, the vehicle speed does not meet the first speed requirement, the slope does not meet the first slope requirement, or the driver operates the brake pedal.

8. A steep slope descent pre-control device, applied in scenarios where the steep slope descent function is activated, characterized in that, The device includes: The acquisition unit acquires vehicle driving status information, including vehicle speed, slope, and accelerator pedal release status. A unit is established to set up pre-control conditions and activation conditions for steep slope descent. The pre-control conditions include a first vehicle speed requirement, a first gradient requirement, and a first accelerator pedal requirement. The first accelerator pedal requirement indicates that the accelerator pedal is not fully released. The first vehicle speed requirement indicates that the vehicle speed is between a first lower speed limit and a first upper speed limit. The activation conditions include a second vehicle speed requirement, a second accelerator pedal requirement, and a second brake pedal requirement. The second vehicle speed requirement indicates that the vehicle speed is between a second lower speed limit and a second upper speed limit. The second accelerator pedal requirement indicates that the accelerator pedal is fully released. The second brake pedal requirement indicates that the brake pedal is fully released. The second lower speed limit is less than the first lower speed limit. The filling unit compares the vehicle driving status information with the hill descent control pre-control conditions. When the vehicle driving status information meets the hill descent control pre-control conditions, the braking pressure is pre-filled into the braking system. The greater the vehicle speed and / or the slope, the greater the pre-filled braking pressure. The pre-filled braking pressure is greater than the first lower pressure limit and less than the first upper pressure limit to avoid dragging and affecting the vehicle's acceleration performance. The braking unit compares the vehicle's driving status information with the hill descent control activation conditions. When the vehicle's driving status information meets the hill descent control activation conditions, it actively applies pressure to the vehicle to brake, based on the pre-filled braking pressure.

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