All-terrain vehicle and its downhill braking method

Abstract

The present application provides an all-terrain vehicle and its downhill braking method, which relates to the technical field of all-terrain vehicle braking control. The all-terrain vehicle includes a running system, a power system, a transmission system, a clutch, an accelerator pedal, and an electrical system. The electrical system includes a first detection module and a control module. The first detection module is used to detect the pedal stroke of the accelerator pedal; the control module is configured to determine the acceleration of the all-terrain vehicle. When the engine is in an idle state, the acceleration of the all-terrain vehicle is greater than the acceleration threshold and both continue for a preset time, the control module can control the all-terrain vehicle to perform downhill braking; wherein, the engine idle state is that the offset of the accelerator pedal is less than the first stroke threshold. This method can improve the accuracy of triggering judgment for downhill braking through the parameters of the accelerator pedal stroke and the acceleration magnitude parameter, thereby improving the safety and stability of the all-terrain vehicle when going downhill.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle braking control, and particularly relates to an all-terrain vehicle and a downhill braking method thereof. Background Art

[0002] UTV, fully known as Utility Vehicle, is called an all-terrain vehicle or a farmer's vehicle. UTV has a large suspension travel and strong off-road capabilities. This type of vehicle is mainly configured for various scenarios such as mines, the wild, beach off-roading, mountain cargo transportation, and farm operations. RUV, fully known as Recreational Utility Vehicle, is a recreational multi-functional vehicle with powerful power, strong off-road capabilities, and a certain cargo space, enabling it to adapt to unknown road conditions in the wild. RUVs are usually suitable for outdoor adventures and daily urban use. ATV, fully known as All Terrain Vehicle, is called an all-terrain vehicle, which is a vehicle suitable for traveling on various terrains, commonly known as a "beach vehicle" or an "all-terrain four-wheel off-road motorcycle". The characteristics of ATVs are practical structure and excellent off-road performance. It can travel on beaches, riverbeds, forest roads, streams, and harsh desert terrains.

[0003] Downhill braking is widely configured for UTV / RUV / ATV models, enabling the driver to reduce the braking operation during downhill driving. In related technologies, downhill braking for UTV / RUV / ATV models mostly uses electronic downhill braking, that is, by the vehicle's pitch angle, throttle pedal state, and braking state, combined with the engine speed, etc. as input conditions to determine whether the vehicle is in a downhill working condition, and through the CVT combination method in UTV / RUV / ATV models, using the engine to generate a certain braking force to the tire end. However, due to the body pitch angle problem in UTV / RUV / ATV models, since the angle sensor is installed in the middle of the body, above the suspension, on the one hand, when the vehicle bed is loaded or the unloaded vehicle accelerates or decelerates suddenly, the body has a certain pitch angle, resulting in accidental triggering of downhill braking; on the other hand, even when the vehicle is on a slope, due to the adjustment of the relative parameters of the suspension system, the body is in a horizontal state, and downhill braking cannot be triggered in time; therefore, it is impossible to accurately judge whether downhill braking needs to be triggered using the angle signal, which in turn affects the safety and stability of the vehicle during downhill driving. Summary of the Invention

[0004] In order to solve the deficiencies of the prior art, the purpose of this application is to provide an all-terrain vehicle and a downhill braking method thereof with better safety and stability.

[0005] In a first aspect, the present application provides an all-terrain vehicle, which includes: a running system, a power system, a transmission system, a clutch, an accelerator pedal, and an electrical system; wherein, the running system is used to drive the all-terrain vehicle to travel; the power system is used to output power, and the power system includes an engine; the transmission system is used to transmit the power output by the engine to the running system; the clutch is used to disconnect and connect the engine and the transmission system; the accelerator pedal is used to control the output power of the engine in response to the operation of the driver. The electrical system includes a first detection module and a control module; the first detection module is used to detect the pedal stroke of the accelerator pedal; the control module is configured to determine the acceleration of the all-terrain vehicle, and the control module is further configured to control the all-terrain vehicle to perform downhill braking when the engine is in an idle state, the acceleration of the all-terrain vehicle is greater than an acceleration threshold, and both conditions continue for a preset time.

[0006] In one embodiment, when the control module controls the all-terrain vehicle to perform downhill braking, after the clutch connects the power transmission between the engine and the transmission system, the control module can adjust the engine speed according to the corresponding relationship information between the vehicle speed of the all-terrain vehicle and the engine speed.

[0007] In one embodiment, the corresponding relationship information includes a first data set and a second data set; wherein, the first data set is the preset curve information or preset correspondence table information of the vehicle speed and the engine speed when the all-terrain vehicle is in a high-speed gear, and the second data set is the preset curve information or preset correspondence table information of the vehicle speed and the engine speed when the all-terrain vehicle is in a low-speed gear.

[0008] In one embodiment, if the all-terrain vehicle is in a two-wheel drive state, and the engine is in an idle state, the acceleration is greater than the acceleration threshold, and both conditions continue for a preset time, the control module controls the all-terrain vehicle to perform downhill braking;

[0009] If the all-terrain vehicle is in a four-wheel drive state, and the vehicle speed of the all-terrain vehicle is less than a vehicle speed threshold, the engine is in an idle state, and the acceleration is greater than the acceleration threshold, and all these conditions continue for a preset time, the control module controls the all-terrain vehicle to perform downhill braking.

[0010] In one embodiment, when the control module determines that the engine is in the idle state, the acceleration of the all-terrain vehicle is greater than the acceleration threshold and lasts for a preset time, the control module controls the all-terrain vehicle to perform downhill braking, and is specifically configured as follows: determining whether the engine is in the idle state. If the engine is in the idle state, the control module obtains the state of the all-terrain vehicle. If the all-terrain vehicle is in the two-wheel drive state, the control module determines whether the acceleration of the all-terrain vehicle is greater than the acceleration threshold. If the acceleration is greater than the acceleration threshold, the engine is in the idle state, and both last for the preset time, the control module controls the all-terrain vehicle to perform downhill braking; and / or, if the all-terrain vehicle is in the four-wheel drive state, the control module determines whether the vehicle speed of the all-terrain vehicle is less than the vehicle speed threshold. If the vehicle speed is less than the vehicle speed threshold, the control module determines whether the acceleration of the all-terrain vehicle is greater than the acceleration threshold. If the acceleration is greater than the acceleration threshold, the engine is in the idle state, the vehicle speed is less than the vehicle speed threshold, and all last for the preset time, the control module controls the all-terrain vehicle to perform downhill braking.

[0011] In one embodiment, the electrical system further includes a second detection module, and the second detection module is configured to detect the vehicle speed of the all-terrain vehicle; the control module determines the acceleration of the all-terrain vehicle, and is specifically configured as follows: obtaining the vehicle speed of the all-terrain vehicle through the second detection module, and determining the acceleration of the all-terrain vehicle based on the vehicle speed of the all-terrain vehicle.

[0012] In one embodiment, before the control module controls the all-terrain vehicle to perform downhill braking, it is further configured to obtain the gear of the all-terrain vehicle; if the all-terrain vehicle is in the first gear and the vehicle speed of the all-terrain vehicle is not less than the first speed, the control module activates the downhill braking function; if the all-terrain vehicle is in the second gear and the vehicle speed of the all-terrain vehicle is not less than the second speed, the control module activates the downhill braking function; wherein, the first speed is greater than the second speed, the first gear is a high-speed gear, and the second gear is a low-speed gear.

[0013] In one embodiment, when controlling the all-terrain vehicle to perform downhill braking, if the offset of the accelerator pedal is greater than the second stroke threshold and the vehicle speed of the all-terrain vehicle is less than the safe vehicle speed, the control module turns off the downhill braking; wherein, the second stroke threshold is greater than the first stroke threshold.

[0014] In one embodiment, the electrical system further includes an angle detection module, and the angle detection module is configured to obtain the pitch angle of the all-terrain vehicle; the conditions for the control module to control the all-terrain vehicle to perform downhill braking further include: the pitch angle of the all-terrain vehicle is within a preset angle range and lasts for a preset time.

[0015] In one embodiment, the electrical system further includes a downhill braking switch; the conditions for the control module to control the all-terrain vehicle to perform downhill braking further include: the downhill braking switch responds to the driver's trigger operation and is in the open state and lasts for a preset time.

[0016] In one embodiment, when controlling the all-terrain vehicle to perform downhill braking, if the downhill braking switch is in the off state and the throttle opening of the all-terrain vehicle is greater than the opening threshold, the control module turns off the downhill braking.

[0017] In one embodiment, when controlling the all-terrain vehicle to perform downhill braking, if the offset of the accelerator pedal is greater than the third stroke threshold for a continuous calibration time and the throttle opening of the all-terrain vehicle is greater than the opening threshold, the control module turns off the downhill braking; wherein, the third stroke threshold is greater than the first stroke threshold.

[0018] In one embodiment, when the control module controls the all-terrain vehicle to perform downhill braking, the control module controls the engine to increase its speed until the speed of the engine is equal to or greater than the engagement speed of the powertrain; wherein, when the engine speed is equal to or greater than the engagement speed of the powertrain, the clutch connects the power transmission between the engine and the powertrain.

[0019] In a second aspect, the present application also provides an all-terrain vehicle downhill braking method, the method comprising: obtaining the acceleration of the all-terrain vehicle and the engine state of the all-terrain vehicle; if the engine is in an idle state, the acceleration of the all-terrain vehicle is greater than the acceleration threshold and both continue for a preset time, controlling the all-terrain vehicle to perform downhill braking; wherein, the engine idle state is that the offset of the accelerator pedal of the all-terrain vehicle is less than the first stroke threshold.

[0020] In one embodiment, the method further comprises: when the all-terrain vehicle performs downhill braking, adjusting the engine speed according to the correspondence information between the vehicle speed of the all-terrain vehicle and the engine speed; wherein, the correspondence information includes a first data set and a second data set; the first data set is the preset curve information or preset correspondence table information of the vehicle speed and the engine speed when the all-terrain vehicle is in a high gear, and the second data set is the preset curve information or preset correspondence table information of the vehicle speed and the engine speed when the all-terrain vehicle is in a low gear.

[0021] In one embodiment, the method further comprises: determining whether the all-terrain vehicle is in a four-wheel drive state or a two-wheel drive state; if the all-terrain vehicle is in a two-wheel drive state, and the engine is in an idle state, the acceleration is greater than the acceleration threshold and both continue for a preset time, controlling the all-terrain vehicle to perform downhill braking; if the all-terrain vehicle is in a four-wheel drive state, obtaining the vehicle speed of the all-terrain vehicle, the vehicle speed of the all-terrain vehicle is less than the vehicle speed threshold, the engine is in an idle state and the acceleration is greater than the acceleration threshold and all continue for a preset time, controlling the all-terrain vehicle to perform downhill braking.

[0022] In one embodiment, before controlling the all-terrain vehicle to perform downhill braking, the method further comprises: obtaining the gear of the all-terrain vehicle; if the all-terrain vehicle is in the first gear and the vehicle speed of the all-terrain vehicle is not less than the first speed, activating the downhill braking function.

[0023] If the all - terrain vehicle is in the second gear and the vehicle speed of the all - terrain vehicle is not less than the second speed, the downhill braking function is activated; wherein, the first speed is greater than the second speed, the first gear is the high - speed gear, and the second gear is the low - speed gear.

[0024] In one embodiment, the method further includes: when the all - terrain vehicle is performing downhill braking, if the offset of the accelerator pedal is greater than the second stroke threshold and the vehicle speed of the all - terrain vehicle is less than the safe vehicle speed, the downhill braking is turned off; wherein, the second stroke threshold is greater than the first stroke threshold.

[0025] In one embodiment, the method further includes: obtaining the pitch angle of the all - terrain vehicle; the condition for controlling the all - terrain vehicle to perform downhill braking further includes: the pitch angle of the all - terrain vehicle is within a preset angle range and lasts for a preset time.

[0026] In one embodiment, the method further includes: when controlling the all - terrain vehicle to perform downhill braking, if the offset of the accelerator pedal is greater than the third stroke threshold for a continuous calibration time and the throttle opening of the all - terrain vehicle is greater than the opening threshold, the control module turns off the downhill braking; wherein, the third stroke threshold is greater than the first stroke threshold.

[0027] For the above - mentioned all - terrain vehicle and its downhill braking method, the electrical system of the all - terrain vehicle includes a first detection module and a control module. The first detection module monitors the pedal stroke of the accelerator pedal in real time. When the engine is in the idle state, the acceleration of the all - terrain vehicle is greater than the set acceleration threshold, and both last for a preset time, the control module controls the all - terrain vehicle to perform downhill braking, thereby realizing effective downhill braking. This method can improve the accuracy of the trigger judgment of downhill braking through engine state and acceleration magnitude parameters, and further improve the safety and stability of the all - terrain vehicle when going downhill. Brief Description of the Drawings

[0028] Figure 1 It is the overall vehicle diagram of the all - terrain vehicle in one embodiment;

[0029] Figure 2 It is the system diagram required for the control module to control the all - terrain vehicle to perform downhill braking in one embodiment;

[0030] Figure 3 It is the preset curve information diagram of the corresponding relationship information in one embodiment;

[0031] Figure 4 It is the flowchart of the control module controlling the all - terrain vehicle to perform downhill braking in one embodiment;

[0032] Figure 5 It is the structural diagram of the electrical system in one embodiment;

[0033] Figure 6 Flow chart of activating downhill braking in different gears in an embodiment;

[0034] Figure 7 Flow chart of turning off downhill braking in an embodiment;

[0035] Figure 8 Flow chart of executing downhill braking control when the all - terrain vehicle is in two - wheel drive state in an embodiment. Detailed implementation manners

[0036] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0037] An embodiment of the present application provides an all - terrain vehicle 100, as Figure 1 shown. The all - terrain vehicle 100 includes a running system 10, a power system 20, a transmission system 30, a clutch 40, an accelerator pedal 50 and an electrical system 60. The running system 10 is used to drive the all - terrain vehicle 100 to travel, and the running system 10 may include drive wheels; the power system 20 is used to output power, and the power system 20 includes an engine 21; the transmission system 30 is used to transmit the power output by the engine 21 to the running system 10; the clutch 40 is used to disconnect and connect the engine 21 and the transmission system 30; the accelerator pedal 50 is used to control the output power of the engine 21 in response to the operation of the driver. The electrical system 60 includes a first detection module 61 and a control module 62. The first detection module 61 is used to detect the pedal stroke of the accelerator pedal 50; the control module 62 is configured to determine the acceleration of the all - terrain vehicle 100, and the control module 62 is further configured to control the all - terrain vehicle 100 to execute downhill braking when the engine 21 is in an idle state, the acceleration of the all - terrain vehicle 100 is greater than an acceleration threshold and both continue for a preset time; wherein, the idle state of the engine 21 is that the offset of the accelerator pedal 50 is less than a first stroke threshold.

[0038] Specifically, the idle state of the engine 21 may refer to that the offset of the accelerator pedal 50 is less than a preset first stroke threshold, that is, when the driver does not step on the accelerator pedal 50 and / or the position of the accelerator pedal 50 is close to the fully released state, the engine 21 is in an idle state. In the idle state of the engine 21, if the acceleration of the all - terrain vehicle 100 is greater than a preset acceleration threshold and the duration is equal to or greater than a preset time, the control module 62 may determine that the all - terrain vehicle 100 is in a downhill state, and then control the all - terrain vehicle 100 to execute downhill braking.

[0039] In this embodiment, the electrical system 60 of the all-terrain vehicle 100 includes a first detection module 61 and a control module 62. The first detection module 61 monitors the pedal travel of the accelerator pedal 50 in real time, and the control module 62 determines the acceleration of the all-terrain vehicle 100. When the engine 21 is in an idle state and the acceleration of the all-terrain vehicle 100 is greater than a set acceleration threshold, and both of these conditions are satisfied and continue for a preset time, the control module 62 can control the all-terrain vehicle 100 to perform downhill braking, achieving precise and effective downhill braking control of the all-terrain vehicle 100. This method can improve the accuracy of triggering judgment for downhill braking through the engine state and acceleration magnitude parameters, thereby improving the safety and stability of the all-terrain vehicle 100 when going downhill.

[0040] In one embodiment, as Figure 2 shown, when the control module 62 controls the all-terrain vehicle 100 to perform downhill braking, after the clutch 40 connects the power transmission between the engine 21 and the transmission system 30, the control module 62 can adjust the engine speed of the engine 21 according to the corresponding relationship information between the vehicle speed of the all-terrain vehicle 100 and the engine speed of the engine 21.

[0041] The control module 62 adjusting the engine speed of the engine 21 in real time may refer to ensuring that the engine speed of the engine 21 matches the vehicle speed during the braking process based on the current driving state of the all-terrain vehicle 100, avoiding the risk of loss of control caused by excessive speed, improving the safety when going downhill, and keeping the all-terrain vehicle 100 going downhill at a constant speed, improving driving comfort. This method enables the control module 62 to dynamically adjust the engine speed of the engine 21 according to the preset corresponding relationship between the actual driving speed of the all-terrain vehicle 100 and the engine speed of the engine 21 to achieve more precise downhill braking control.

[0042] Exemplarily, when the vehicle speed of the all-terrain vehicle 100 is relatively fast and the engine speed of the engine 21 is relatively low during the downhill process, the control module 62 can appropriately increase the engine speed of the engine 21 according to the preset corresponding relationship information to increase the braking force of the engine 21 and reasonably control the vehicle speed; if the vehicle speed is slow and the engine speed of the engine 21 is high, the control module 62 can reduce the engine speed of the engine 21 to avoid excessive braking causing the vehicle speed of the all-terrain vehicle 100 to be too low or losing power.

[0043] In one embodiment, the corresponding relationship information includes a first data set and a second data set; wherein, the first data set is the preset curve information or preset corresponding table information of the vehicle speed and the engine speed of the engine 21 when the all-terrain vehicle 100 is in a high gear, and the second data set is the preset curve information or preset corresponding table information of the vehicle speed and the engine speed of the engine 21 when the all-terrain vehicle 100 is in a low gear.

[0044] The first data set may represent the preset curve information or preset correspondence table information between the vehicle speed and the engine 21 speed when the all-terrain vehicle 100 is in a high gear (e.g., H gear), that is, in the high gear, the engine 21 speed ranges corresponding to different vehicle speeds. The second data set may represent the preset curve information or preset correspondence table information between the vehicle speed and the engine 21 speed when the all-terrain vehicle 100 is in a low gear (such as L gear), that is, in the low gear, the engine 21 speed ranges corresponding to different vehicle speeds.

[0045] It should be noted that the first data set and the second data set can be pre-calibrated through experiments or simulations, which can reflect the matching relationship between the vehicle speed and the engine 21 speed in different gears. When the control module 62 performs downhill braking, it can select the corresponding data set (the first data set or the second data set) according to the current gear, and adjust the engine 21 speed in real time based on the vehicle speed to make it conform to the preset curve information or correspondence table information.

[0046] Exemplarily, the preset curve corresponding to the first data set is as Figure 3 shown, where the abscissa is the vehicle speed in km / h and the ordinate is the engine 21 speed in rpm. The preset correspondence table information corresponding to the first data set can also be as shown in the following table:

[0047]

[0048] In this embodiment, the correspondence information matches and presets the vehicle speed and the engine 21 speed of the all-terrain vehicle 100 in the high gear and the low gear respectively through the first data set and the second data set. This method not only improves the accuracy and safety of downhill braking, but also enhances the adaptability of the all-terrain vehicle 100 in different gears.

[0049] In one embodiment, as Figure 4 shown, if the all-terrain vehicle 100 is in a two-wheel drive state, and the engine 21 is in an idle state, the acceleration is greater than the acceleration threshold and both last for a preset time, the control module 62 controls the all-terrain vehicle 100 to perform downhill braking; the all-terrain vehicle 100 is in a two-wheel drive state, that is, the power of the all-terrain vehicle 100 is transmitted only through two drive wheels.

[0050] If the all-terrain vehicle 100 is in a four-wheel drive state, as Figure 4 shown, and when the vehicle speed of the all-terrain vehicle 100 is less than the vehicle speed threshold, the engine 21 is in an idle state, and the acceleration is greater than the acceleration threshold and both last for a preset time, the control module 62 controls the all-terrain vehicle 100 to perform downhill braking.

[0051] When the all-terrain vehicle 100 is in four-wheel drive, if the vehicle speed of the all-terrain vehicle 100 is less than the set vehicle speed threshold, the engine 21 is in the idle state, and the acceleration of the all-terrain vehicle 100 is greater than the set acceleration threshold, and these conditions continue for a certain preset time, the control module 62 controls the all-terrain vehicle 100 to perform downhill braking.

[0052] It should be noted that when the all-terrain vehicle 100 is in four-wheel drive, the vehicle speed of the all-terrain vehicle 100 needs to be less than the vehicle speed threshold because the four-wheel drive system provides stronger traction and grip, enabling the all-terrain vehicle 100 to be better controlled and stably driven at low speeds. If the vehicle speed is too high, even when the all-terrain vehicle 100 is in four-wheel drive, the all-terrain vehicle 100 may be difficult to effectively control due to excessive inertia. Therefore, a vehicle speed threshold needs to be set to ensure downhill braking within the low-speed range.

[0053] In contrast, when the all-terrain vehicle 100 is in two-wheel drive, the power transmission of the all-terrain vehicle 100 passes through two wheels, and the grip is relatively weak. Therefore, the requirement for vehicle speed is not as strict as that in four-wheel drive, and thus no additional vehicle speed threshold condition is required. The downhill braking of the all-terrain vehicle 100 in two-wheel drive depends more on the idle state of the engine 21 and the detection of acceleration to ensure effective control of the speed of the all-terrain vehicle 100 under different road conditions.

[0054] In this embodiment, this design ensures that under different driving modes, the control module 62 can accurately control the activation of the downhill braking function according to the actual driving state of the all-terrain vehicle 100 (such as the idle state of the engine 21, acceleration, vehicle speed, etc.), improving the accuracy and safety of braking.

[0055] In one embodiment, when the control module 62 determines that the engine 21 is in the idle state, the acceleration of the all-terrain vehicle 100 is greater than the acceleration threshold and continues for a preset time, the control module 62 controls the all-terrain vehicle 100 to perform downhill braking, and is specifically configured as follows:

[0056] Judge whether the engine 21 is in the idle state. If the engine 21 is in the idle state, the control module 62 obtains the state of the all-terrain vehicle 100.

[0057] The control module 62 can judge whether the engine 21 is in the idle state by monitoring whether the offset of the accelerator pedal 50 is less than the first stroke threshold. If it is confirmed that the engine 21 is in the idle state, the control module 62 obtains the real-time state parameters of the all-terrain vehicle 100, and the state parameters include data such as vehicle speed, driving mode (two-wheel drive or four-wheel drive), gear position, and acceleration.

[0058] If the all - terrain vehicle 100 is in a two - wheel drive state, the control module 62 determines whether the acceleration of the all - terrain vehicle 100 is greater than the acceleration threshold. If the acceleration is greater than the acceleration threshold, the engine 21 is in an idle state, and both conditions persist for a preset time, the control module 62 controls the all - terrain vehicle 100 to perform downhill braking;

[0059] If the all - terrain vehicle 100 is in a four - wheel drive state, the control module 62 determines whether the vehicle speed of the all - terrain vehicle 100 is less than the vehicle speed threshold. If the vehicle speed is less than the vehicle speed threshold, the control module 62 determines whether the acceleration of the all - terrain vehicle 100 is greater than the acceleration threshold. If the acceleration is greater than the acceleration threshold, the engine 21 is in an idle state, the vehicle speed is less than the vehicle speed threshold, and all these conditions persist for a preset time, the control module 62 controls the all - terrain vehicle 100 to perform downhill braking.

[0060] As Figure 4 shown, the steps for the control module 62 to control the all - terrain vehicle 100 to perform downhill braking are as follows:

[0061] Step S401: Determine whether the engine 21 is in an idle state;

[0062] If the engine 21 is not in an idle state, then execute step S402; if the engine 21 is in an idle state, then execute step S403.

[0063] Step S402: Do not perform downhill braking;

[0064] Step S403: Determine whether the all - terrain vehicle 100 is in a four - wheel drive state;

[0065] If the all - terrain vehicle 100 is in a four - wheel drive state, then execute step S404; if the all - terrain vehicle 100 is not in a four - wheel drive state (i.e., the all - terrain vehicle 100 is in a two - wheel drive state), then execute step S408.

[0066] Step S404: Determine whether the vehicle speed of the all - terrain vehicle 100 is less than the preset vehicle speed threshold;

[0067] If the vehicle speed of the all - terrain vehicle 100 is less than the preset vehicle speed threshold, then execute step S405; if the vehicle speed of the all - terrain vehicle 100 is greater than or equal to the preset vehicle speed threshold, then execute step S402.

[0068] Step S405: Determine whether the acceleration of the all - terrain vehicle 100 is greater than the preset acceleration threshold;

[0069] If the acceleration of the all - terrain vehicle 100 is greater than the preset acceleration threshold, then execute step S406; if the acceleration of the all - terrain vehicle 100 is not greater than the preset acceleration threshold, then execute step S402.

[0070] Step S406: Determine whether the vehicle speed is less than a preset vehicle speed threshold, the acceleration is greater than a preset acceleration threshold, and the engine 21 is in an idle state all continue for a preset time;

[0071] If the duration meets the preset time, execute step S407; if the duration does not meet the preset time, execute step S402.

[0072] Step S407: Perform downhill braking;

[0073] Step S408: Determine whether the acceleration of the all - terrain vehicle 100 is greater than a preset acceleration threshold;

[0074] If the acceleration of the all - terrain vehicle 100 is not greater than the preset acceleration threshold, execute step S409; if the acceleration of the all - terrain vehicle 100 is greater than the preset acceleration threshold, execute step S410.

[0075] Step S409: Do not perform downhill braking;

[0076] Step S410: Determine whether the acceleration is greater than a preset acceleration threshold and the engine 21 is in an idle state all continue for a preset time.

[0077] If the duration meets the preset time, execute step S407; if the duration does not meet the preset time, execute step S409.

[0078] In this embodiment, this design enables the downhill braking function to be accurately controlled according to different driving modes and the state of the all - terrain vehicle 100, improving the adaptability and safety of downhill braking, and ensuring that the vehicle speed can be effectively assisted for the driver to control under various working conditions.

[0079] In one embodiment, as Figure 5 shown, the electrical system 60 further includes a second detection module 63, and the second detection module 63 is configured to detect the vehicle speed of the all - terrain vehicle 100; the control module 62 determines the acceleration of the all - terrain vehicle 100, and is specifically configured to: obtain the vehicle speed of the all - terrain vehicle 100 through the second detection module 63, and determine the acceleration of the all - terrain vehicle 100 based on the vehicle speed of the all - terrain vehicle 100. The control module 62 can derive the real - time acceleration of the all - terrain vehicle 100 based on the continuous vehicle speed data provided by the second detection module 63 by calculating the change in vehicle speed per unit time (for example, using a differential algorithm or an integral algorithm). For example, if the vehicle speed increases from v1 to v2 within Δt time, then the acceleration a=(v2 - v1) / Δt. This method enables the control module 62 to monitor the driving state of the all - terrain vehicle 100 in real time, provide accurate acceleration information for the downhill braking function, and thus achieve more accurate braking control.

[0080] Exemplarily, the first detection module 61 can be a displacement sensor or a potentiometer for detecting the travel of the accelerator pedal 50. The control module 62 can be a microcontroller or an electronic control unit (ECU) that can process signals from the first detection module 61 and the second detection module 63 and control the operations of the engine 21 and the clutch 40 according to preset logics and algorithms. The second detection module 63 can be an accelerometer or an inertial measurement unit (IMU) for measuring the acceleration and tilt angle of the all-terrain vehicle 100.

[0081] In one embodiment, as Figure 6 shown, before the control module 62 controls the all-terrain vehicle 100 to perform downhill braking, it is further configured to obtain the gear position of the all-terrain vehicle 100; if the all-terrain vehicle 100 is in the first gear position and the vehicle speed of the all-terrain vehicle 100 is not less than the first speed, the control module 62 activates the downhill braking function; if the all-terrain vehicle 100 is in the second gear position and the vehicle speed of the all-terrain vehicle 100 is not less than the second speed, the control module 62 activates the downhill braking function; wherein, the first speed is greater than the second speed, the first gear position is a high-speed gear position, and the second gear position is a low-speed gear position.

[0082] The steps before the control module 62 controls the all-terrain vehicle 100 to perform downhill braking according to the gear position of the all-terrain vehicle 100 can refer to Figure 4 the steps. This embodiment can be connected to the steps of the above embodiment and use step S601 as a new judgment condition to continue Figure 4 the judgment result of performing downhill braking in step S407, and further judge the downhill braking. The steps of this embodiment can be as follows:

[0083] Step S601: Judge whether the all-terrain vehicle 100 is in the first gear position;

[0084] If the all-terrain vehicle 100 is in the first gear position, then perform step S602; if the all-terrain vehicle 100 is not in the first gear position, then perform step S606.

[0085] Step S602: The all-terrain vehicle 100 is in the first gear position;

[0086] Step S603: Judge whether the vehicle speed of the all-terrain vehicle 100 is not less than the first speed;

[0087] If the vehicle speed of the all-terrain vehicle 100 is not less than the first vehicle speed, then perform step S604; if the vehicle speed of the all-terrain vehicle 100 is less than the first vehicle speed, then perform step S605.

[0088] Step S604: Perform downhill braking;

[0089] Step S605: Do not perform downhill braking;

[0090] Step S606: The all-terrain vehicle 100 is in the second gear;

[0091] Step S607: Determine whether the vehicle speed of the all-terrain vehicle 100 is not less than the second speed;

[0092] If the vehicle speed of the all-terrain vehicle 100 is not less than the second vehicle speed, then execute Step S608; if the vehicle speed of the all-terrain vehicle 100 is less than the second vehicle speed, then execute Step S609.

[0093] Step S608: Execute downhill braking;

[0094] Step S609: Do not execute downhill braking.

[0095] This method enables the activation of the downhill braking function to match the gear and vehicle speed of the all-terrain vehicle 100, ensuring that appropriate braking assistance can be provided according to the actual driving speed in different gears, effectively preventing braking insufficiency or excessive braking caused by too high vehicle speed or mismatched gears.

[0096] In one embodiment, as Figure 7 shown, when controlling the all-terrain vehicle 100 to execute downhill braking, if the offset of the accelerator pedal 50 is greater than the second stroke threshold and the vehicle speed of the all-terrain vehicle 100 is less than the safe vehicle speed, the control module 62 turns off the downhill braking; wherein, the second stroke threshold is greater than the first stroke threshold.

[0097] Exemplarily, in some complex road conditions, the driver needs to appropriately accelerate to cross obstacles or adjust the attitude of the all-terrain vehicle 100. At this time, if the downhill braking function still works continuously, it may cause insufficient power of the all-terrain vehicle 100 and affect the driver's control of the all-terrain vehicle 100. Therefore, when the offset of the accelerator pedal 50 is greater than the second stroke threshold and the vehicle speed is lower than the safe vehicle speed, it is necessary to turn off the downhill braking function to ensure the driving safety of the all-terrain vehicle 100 in the low-speed state.

[0098] The steps for the control module 62 to turn off the downhill braking are as follows:

[0099] Step S701: The all-terrain vehicle 100 executes downhill braking;

[0100] Step S702: Determine whether the offset of the accelerator pedal 50 is greater than the second stroke threshold;

[0101] If the offset of the accelerator pedal 50 is greater than the second stroke threshold, then execute Step S703; if the offset of the accelerator pedal 50 is not greater than the second stroke threshold, then execute Step S704.

[0102] Step S703: Determine whether the vehicle speed of the all-terrain vehicle 100 is less than the safe vehicle speed;

[0103] If the vehicle speed of the all-terrain vehicle 100 is less than the safe vehicle speed, step S705 is executed; if the vehicle speed of the all-terrain vehicle 100 is not less than the safe vehicle speed, step S704 is executed.

[0104] Step S704: Continue to perform downhill braking;

[0105] Step S705: Turn off downhill braking.

[0106] This method can flexibly adjust the control strategy of downhill braking according to the driver's operation intention and the real-time state of the all-terrain vehicle 100, avoiding excessive interference with the driving of the all-terrain vehicle 100 when braking is not required.

[0107] In one embodiment, as Figure 5 shown, the electrical system 60 further includes an angle detection module 64, and the angle detection module 64 is configured to obtain the pitch angle of the all-terrain vehicle 100; the conditions for the control module 62 to control the all-terrain vehicle 100 to perform downhill braking further include: the pitch angle of the all-terrain vehicle 100 is within a preset angle range and lasts for a preset time. This method ensures that the downhill braking function is only activated when the all-terrain vehicle 100 is actually in a downhill working condition, effectively avoiding false triggering caused by uneven road surfaces or short-term inclinations, improving the accuracy and reliability of braking control, and enhancing the adaptability and safety of the all-terrain vehicle 100 in complex terrains. Specifically, the angle detection module 64 can be an inclination sensor. The inclination sensor can measure the inclination angle of the all-terrain vehicle 100 relative to the horizontal plane and provide accurate information on the vehicle's pitch state for the control module 62.

[0108] In one embodiment, as Figure 5 shown, the electrical system 60 further includes a downhill braking switch 65; the conditions for the control module 62 to control the all-terrain vehicle 100 to perform downhill braking further include: the downhill braking switch 65 is in an open state and lasts for a preset time in response to the driver's triggering operation.

[0109] Exemplarily, before preparing to go downhill, the driver will turn on the downhill braking switch 65 in advance. After the control module 62 detects that the downhill braking switch 65 is in an open state and lasts for a certain time, and combines other conditions (such as the engine 21 idling, acceleration, etc.), it will perform downhill braking. This method ensures that the activation of the downhill braking function is completely determined by the driver's will, enhances driving autonomy and safety, effectively avoids false triggering, and makes the downhill braking control of the all-terrain vehicle 100 more accurate and reliable.

[0110] In one embodiment, as Figure 5 shown, when controlling the all-terrain vehicle 100 to perform downhill braking, if the downhill braking switch 65 is in a closed state and the throttle 211 opening of the all-terrain vehicle 100 is greater than the opening threshold, the control module 62 turns off the downhill braking.

[0111] The downhill braking switch 65 is controlled by the driver. When it is in the off state, it can indicate that the driver does not require the all-terrain vehicle 100 to perform downhill braking. Further, the throttle 211 opening degree being greater than the opening degree threshold can indicate that the driver is stepping on the accelerator pedal 50 to increase the power output of the engine 21, usually indicating the driver's intention to accelerate. It should be noted that the throttle 211 is included in the engine 21. In this case, continuing to perform downhill braking will conflict with the driver's operation intention, resulting in insufficient power or unstable driving of the all-terrain vehicle 100. Therefore, the control module 62 will turn off the downhill braking to ensure that the all-terrain vehicle 100 can drive normally according to the driver's operation, while avoiding unnecessary braking intervention. This method ensures that when the driver does not activate the downhill braking function and has an intention to accelerate, the downhill braking will not interfere with the acceleration operation of the all-terrain vehicle 100.

[0112] In one embodiment, when controlling the all-terrain vehicle 100 to perform downhill braking, if the offset of the accelerator pedal 50 is greater than the third stroke threshold for a continuous calibration time and the throttle 211 opening degree of the all-terrain vehicle 100 is greater than the opening degree threshold, the control module 62 turns off the downhill braking; wherein, the third stroke threshold is greater than the first stroke threshold.

[0113] Exemplarily, in some cases where it is necessary to quickly accelerate through an obstacle or adjust the attitude of the all-terrain vehicle 100, the driver will step on the accelerator pedal 50. At this time, if the downhill braking is still working continuously, it may cause insufficient power of the all-terrain vehicle 100, affecting the driver's control of the all-terrain vehicle 100. Therefore, by monitoring the offset of the accelerator pedal 50 and the throttle 211 opening degree, the control module 62 can turn off the downhill braking at an appropriate time. This method can avoid the misactivation of the downhill braking function when the driver has an obvious intention to accelerate, thereby improving the driving flexibility and safety, and ensuring that the all-terrain vehicle 100 can respond in a timely manner according to the driver's operation requirements.

[0114] In one embodiment, when the control module 62 controls the all-terrain vehicle 100 to perform downhill braking, the control module 62 controls the engine 21 to increase the speed until the speed of the engine 21 is equal to or greater than the engagement speed of the transmission system 30; wherein, when the engine 21 speed is equal to or greater than the engagement speed of the transmission system 30, the clutch 40 connects the power transmission between the engine 21 and the transmission system 30.

[0115] Specifically, the control module 62 can adjust the rotational speed of the engine 21 to gradually increase it until the rotational speed of the engine 21 reaches or exceeds the engagement rotational speed of the transmission system 30. It should be noted that the transmission system 30 can be a continuously variable transmission (CVT). Among them, the transmission system 30 includes a driving pulley, a belt, and a driven pulley. The driving pulley in the transmission system 30 is connected to the crankshaft of the engine 21 and receives the torque from the engine 21. Therefore, the rotational speed of the engine 21 will directly affect the rotational speed of the driving pulley. The driven pulley is connected to the driving pulley by a belt. It receives the torque from the driving pulley and transmits it to the running system 10 of the all-terrain vehicle 100. The transmission system 30 adjusts the transmission ratio by changing the effective diameter of the driving pulley. When the diameter of the driving pulley increases, the transmission ratio decreases, and the rotational speed of the driven pulley relatively increases; when the diameter of the driving pulley decreases, the transmission ratio increases, and the rotational speed of the driven pulley relatively decreases. The effective diameter of the driven pulley is similar to that of the driving pulley, and the effective diameter of the driven pulley also changes to cooperate with the driving pulley to adjust the transmission ratio. The transmission ratio is the ratio of the diameter of the driving pulley to the diameter of the driven pulley. The transmission ratio determines the relationship between the rotational speed of the driven pulley and the rotational speed of the driving pulley. The engagement rotational speed of the transmission system 30 is the rotational speed at which the belt drives the driven pulley to rotate. At a certain moment, the rotational speed at which the belt drives the driven pulley can be calculated by the following formula: ; where: is the rotational speed of the engine 21 (usually expressed in revolutions per minute, rpm), is the effective diameter of the driving pulley, is the effective diameter of the driven pulley. For example, if the rotational speed of the engine 21 is 2000 rpm, the effective diameter of the driving pulley is 50 mm, and the effective diameter of the driven pulley is 100 mm, the rotational speed of the driven pulley will be: 2000×0.5 = 1000 rpm.

[0116] It should be further noted that when the all-terrain vehicle 100 is in a downhill state, if the rotational speed of the engine 21 is lower than the engagement rotational speed of the transmission system 30, the driving pulley no longer presses the belt, and there is no pre-tightening force between the belt and the driving pulley and the driven pulley. The driven pulley has no tendency to rotate following the driving pulley; and because the vehicle speed is relatively fast, and the rotational speed of the driven pulley connected to the wheel hub of the all-terrain vehicle 100 without the tendency to rotate following the driving pulley will also become faster. At this time, the engine 21 cannot play a braking effect. When the rotational speed of the engine 21 is equal to or greater than the engagement rotational speed of the transmission system 30, there is a pre-tightening force between the driving pulley, the driven pulley, and the belt. Therefore, the driven pulley has a tendency to rotate following the driving pulley, and the rotational speed of the driven pulley becomes faster as it follows the all-terrain vehicle 100 downhill. Under the combined action of the two tendencies, the driven pulley is blocked by the frictional force of the belt, and the downhill speed will gradually slow down. Therefore, the wheels connected to the driven pulley will be subject to a resistance force and the speed will slow down, thus playing a role in downhill braking.

[0117] In one embodiment, as Figure 8 shown, taking the all-terrain vehicle 100 in a two-wheel drive state as an example, the specific steps for the all-terrain vehicle 100 in a two-wheel drive state to perform downhill braking control are as follows:

[0118] Step S801: Determine whether the engine 21 is in an idle state;

[0119] If the engine 21 is in an idle state, execute step S803; if the engine 21 is not in an idle state, execute step S802.

[0120] Step S802: Do not perform downhill braking;

[0121] Step S803: Determine whether the vehicle speed in different gears is not less than the vehicle speed threshold corresponding to that gear;

[0122] If the vehicle speed in different gears is not less than the vehicle speed threshold corresponding to that gear, execute step S804; if the vehicle speed in different gears is less than the vehicle speed threshold corresponding to that gear, execute step S802.

[0123] Step S804: Determine whether the downhill braking switch 65 is turned on;

[0124] If the downhill braking switch 65 is turned on, execute step S805; if the downhill braking switch 65 is turned off, execute step S802.

[0125] Step S805: Determine whether the opening degree of the throttle valve 211 is not greater than the opening degree threshold;

[0126] If the opening degree of the throttle valve 211 is not greater than the opening degree threshold, execute step S806; if the opening degree of the throttle valve 211 is greater than the opening degree threshold, execute step S802.

[0127] Step S806: Determine whether the pitch angle obtained by the angle detection module 64 is within the preset angle range;

[0128] If the pitch angle obtained by the angle detection module 64 is within the preset angle range, execute step S807; if the pitch angle obtained by the angle detection module 64 is not within the preset angle range, execute step S802.

[0129] Step S807: Determine whether the acceleration of the all-terrain vehicle 100 is greater than the preset acceleration threshold;

[0130] If the acceleration of the all-terrain vehicle 100 is greater than the preset acceleration threshold, execute step S808; if the acceleration of the all-terrain vehicle 100 is not greater than the preset acceleration threshold, execute step S802.

[0131] Step S808: Determine whether the acceleration is greater than a preset acceleration threshold, the engine 21 is in an idle state, the downhill braking switch 65 is in an open state, the throttle opening 211 is not greater than the opening threshold, and the pitch angle is within a preset angle range, all of which have lasted for a preset time;

[0132] If the duration meets the preset time, execute step S809; if the duration does not meet the preset time, execute step S802.

[0133] Step S809: Execute downhill braking.

[0134] Based on the same inventive concept, the embodiment of the present application also provides a downhill braking method for an all-terrain vehicle 100. The implementation solution provided by this method to solve the problem is similar to the implementation solution described in the above all-terrain vehicle 100. Therefore, the specific limitations in one or more embodiments of the downhill braking method for the all-terrain vehicle 100 provided below can refer to the limitations on the all-terrain vehicle 100 in the above text, and will not be repeated here. It should be noted that the downhill braking method for the all-terrain vehicle 100 is applied to a controller on the all-terrain vehicle 100, such as the control module 62 in the above all-terrain vehicle.

[0135] In one embodiment, a downhill braking method for an all-terrain vehicle 100 is provided. The method includes:

[0136] Obtain the acceleration of the all-terrain vehicle 100 and the state of the engine 21 of the all-terrain vehicle 100; when the engine 21 is in an idle state and the acceleration of the all-terrain vehicle 100 is greater than the acceleration threshold and both last for a preset time, control the all-terrain vehicle 100 to execute downhill braking; wherein, the engine 21 being in an idle state means that the offset of the accelerator pedal 50 of the all-terrain vehicle 100 is less than the first stroke threshold.

[0137] In one embodiment, the downhill braking method for the all-terrain vehicle 100 further includes: when the all-terrain vehicle 100 executes downhill braking, adjust the speed of the engine 21 according to the corresponding relationship information between the vehicle speed of the all-terrain vehicle 100 and the engine speed; wherein, the corresponding relationship information includes a first data set and a second data set; the first data set is the preset curve information or preset correspondence table information of the vehicle speed and the engine speed when the all-terrain vehicle 100 is in a high gear, and the second data set is the preset curve information or preset correspondence table information of the vehicle speed and the engine speed when the all-terrain vehicle 100 is in a low gear.

[0138] In one embodiment, the downhill braking method for the all-terrain vehicle 100 further includes: determine whether the all-terrain vehicle 100 is in a four-wheel drive state or a two-wheel drive state; if the all-terrain vehicle 100 is in a two-wheel drive state, and the engine 21 is in an idle state, the acceleration is greater than the acceleration threshold and both last for a preset time, control the all-terrain vehicle 100 to execute downhill braking.

[0139] In one embodiment, when the all-terrain vehicle 100 is in a four-wheel drive state, obtain the vehicle speed of the all-terrain vehicle 100. If the vehicle speed of the all-terrain vehicle 100 is less than the vehicle speed threshold, the engine 21 is in an idle state, and the acceleration is greater than the acceleration threshold and all continue for a preset time, control the all-terrain vehicle 100 to perform downhill braking.

[0140] In one embodiment, before controlling the all-terrain vehicle 100 to perform downhill braking, the downhill braking method of the all-terrain vehicle 100 further includes: obtaining the gear position of the all-terrain vehicle 100; if the all-terrain vehicle 100 is in the first gear position and the vehicle speed of the all-terrain vehicle 100 is not less than the first speed, activate the downhill braking function.

[0141] In one embodiment, if the all-terrain vehicle 100 is in the second gear position and the vehicle speed of the all-terrain vehicle 100 is not less than the second speed, activate the downhill braking function; wherein, the first speed is greater than the second speed, the first gear position is a high-speed gear position, and the second gear position is a low-speed gear position.

[0142] In one embodiment, the downhill braking method of the all-terrain vehicle 100 further includes: when the all-terrain vehicle 100 is performing downhill braking, if the offset of the accelerator pedal 50 is greater than the second stroke threshold and the vehicle speed of the all-terrain vehicle 100 is less than the safe vehicle speed, turn off the downhill braking; wherein, the second stroke threshold is greater than the first stroke threshold.

[0143] In one embodiment, the downhill braking method of the all-terrain vehicle 100 further includes: obtaining the pitch angle of the all-terrain vehicle 100; the conditions for controlling the all-terrain vehicle 100 to perform downhill braking further include: the pitch angle of the all-terrain vehicle 100 is within a preset angle range and continues for a preset time.

[0144] In one embodiment, the downhill braking method of the all-terrain vehicle 100 further includes: when controlling the all-terrain vehicle 100 to perform downhill braking, if the offset of the accelerator pedal 50 is greater than the third stroke threshold for a continuous calibration time and the opening degree of the throttle valve 211 of the all-terrain vehicle 100 is greater than the opening degree threshold, the control module 62 turns off the downhill braking; wherein, the third stroke threshold is greater than the first stroke threshold.

[0145] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0146] The above embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation to the patent scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.

Claims

1. An all-terrain vehicle, comprising: A running system for driving the all-terrain vehicle to travel; A power system, the power system including an engine for outputting power; A transmission system for transmitting the power output by the engine to the running system; A clutch for disconnecting and connecting the engine and the transmission system; An accelerator pedal for controlling the output power of the engine in response to the operation of the driver; An electrical system; Characterized in that the electrical system includes: A first detection module for detecting the pedal travel of the accelerator pedal; A control module, the control module controlling the all-terrain vehicle to perform downhill braking when the engine is in an idle state, the acceleration of the all-terrain vehicle is greater than an acceleration threshold and both last for a preset time; wherein, the engine idle state is that the offset of the accelerator pedal is less than a first travel threshold; If the all-terrain vehicle is in a two-wheel drive state, and the engine is in an idle state, the acceleration is greater than the acceleration threshold and both last for the preset time, the control module controls the all-terrain vehicle to perform downhill braking; if the all-terrain vehicle is in a four-wheel drive state, and the vehicle speed of the all-terrain vehicle is less than a vehicle speed threshold, the engine is in an idle state, the acceleration is greater than the acceleration threshold and both last for the preset time, the control module controls the all-terrain vehicle to perform downhill braking.

2. The all-terrain vehicle according to claim 1, characterized in that, When the control module controls the all-terrain vehicle to perform downhill braking, after the clutch connects the power transmission between the engine and the transmission system, the control module can adjust the engine speed according to the corresponding relationship information between the vehicle speed of the all-terrain vehicle and the engine speed.

3. The all-terrain vehicle according to claim 2, characterized in that The corresponding relationship information includes a first data set and a second data set; Wherein, the first data set is the preset curve information or preset correspondence table information of the vehicle speed and the engine speed when the all-terrain vehicle is in a high gear, and the second data set is the preset curve information or preset correspondence table information of the vehicle speed and the engine speed when the all-terrain vehicle is in a low gear.

4. The all-terrain vehicle according to claim 1, characterized in that When the control module determines that the engine is in an idle state, the acceleration of the all-terrain vehicle is greater than an acceleration threshold and lasts for a preset time, and controls the all-terrain vehicle to perform downhill braking, it is specifically configured as: Judging whether the engine is in an idle state, if the engine is in an idle state, the control module obtains the state of the all-terrain vehicle; If the all-terrain vehicle is in a two-wheel drive state, the control module judges whether the acceleration of the all-terrain vehicle is greater than the acceleration threshold. If the acceleration is greater than the acceleration threshold, the engine is in an idle state and both last for the preset time, the control module controls the all-terrain vehicle to perform downhill braking; and / or If the all - terrain vehicle is in four - wheel drive state, the control module determines whether the vehicle speed of the all - terrain vehicle is less than the vehicle speed threshold. If the vehicle speed is less than the vehicle speed threshold, the control module determines whether the acceleration of the all - terrain vehicle is greater than the acceleration threshold. If the acceleration is greater than the acceleration threshold, the engine is in idle state, and the vehicle speed is less than the vehicle speed threshold and all of these conditions persist for the preset time, the control module controls the all - terrain vehicle to perform downhill braking.

5. The all-terrain vehicle according to any one of claims 1 to 3, characterized in that, The electrical system further includes a second detection module, and the second detection module is configured to detect the vehicle speed of the all - terrain vehicle; The control module determines the acceleration of the all - terrain vehicle, and is specifically configured to: obtain the vehicle speed of the all - terrain vehicle through the second detection module, and determine the acceleration of the all - terrain vehicle based on the vehicle speed of the all - terrain vehicle.

6. The all-terrain vehicle according to any one of claims 1 to 3, characterized in that Before the control module controls the all - terrain vehicle to perform downhill braking, it is further configured to obtain the gear position of the all - terrain vehicle; If the all - terrain vehicle is in the first gear and the vehicle speed of the all - terrain vehicle is not less than the first speed, the control module activates the downhill braking function; and / or If the all - terrain vehicle is in the second gear and the vehicle speed of the all - terrain vehicle is not less than the second speed, the control module activates the downhill braking function; where the first speed is greater than the second speed, the first gear is a high - speed gear, and the second gear is a low - speed gear.

7. The all-terrain vehicle according to any one of claims 1 to 3, characterized in that, When controlling the all - terrain vehicle to perform downhill braking, if the offset of the accelerator pedal is greater than the second stroke threshold and the vehicle speed of the all - terrain vehicle is less than the safe vehicle speed, the control module turns off the downhill braking; where the second stroke threshold is greater than the first stroke threshold.

8. The all-terrain vehicle according to any one of claims 1 to 3, characterized in that, The electrical system further includes an angle detection module, and the angle detection module is configured to obtain the pitch angle of the all - terrain vehicle; The conditions for the control module to control the all - terrain vehicle to perform downhill braking further include: the pitch angle of the all - terrain vehicle is within a preset angle range and persists for the preset time.

9. The all-terrain vehicle according to any one of claims 1 to 3, characterized in that, The electrical system further includes a downhill braking switch; The conditions for the control module to control the all - terrain vehicle to perform downhill braking further include: the downhill braking switch responds to the driver's trigger operation, is in the open state and persists for the preset time.

10. The all-terrain vehicle according to claim 9, characterized in that, When controlling the all - terrain vehicle to perform downhill braking, if the downhill braking switch is in the closed state and the throttle opening of the all - terrain vehicle is greater than the opening threshold, the control module turns off the downhill braking.

11. The all-terrain vehicle according to claim 9, characterized in that, When controlling the all - terrain vehicle to perform downhill braking, if the offset of the accelerator pedal is greater than the third stroke threshold for the calibrated time and the throttle opening of the all - terrain vehicle is greater than the opening threshold, the control module turns off the downhill braking; where the third stroke threshold is greater than the first stroke threshold.

12. The all-terrain vehicle according to claim 1, characterized in that, When the control module controls the all-terrain vehicle to perform downhill braking, the control module controls the engine to increase its speed until the speed of the engine is equal to or greater than the engagement speed of the powertrain; wherein, when the engine speed is equal to or greater than the engagement speed of the powertrain, the clutch connects the power transmission between the engine and the powertrain.

13. A downhill braking method for an all-terrain vehicle, characterized in that, The method includes: Obtaining the acceleration of the all-terrain vehicle and the engine state of the all-terrain vehicle; If the engine is in an idle state, the acceleration of the all-terrain vehicle is greater than the acceleration threshold, and both conditions persist for a preset time, controlling the all-terrain vehicle to perform downhill braking; wherein, the engine idle state means that the offset of the throttle pedal of the all-terrain vehicle is less than the first stroke threshold; The method further includes: Determining whether the all-terrain vehicle is in a four-wheel drive state or a two-wheel drive state; If the all-terrain vehicle is in a two-wheel drive state, and the engine is in an idle state, the acceleration is greater than the acceleration threshold, and both conditions persist for the preset time, controlling the all-terrain vehicle to perform downhill braking; If the all-terrain vehicle is in a four-wheel drive state, obtaining the vehicle speed of the all-terrain vehicle, when the vehicle speed of the all-terrain vehicle is less than the vehicle speed threshold, the engine is in an idle state, the acceleration is greater than the acceleration threshold, and all these conditions persist for the preset time, controlling the all-terrain vehicle to perform downhill braking.

14. The downhill braking method of the all-terrain vehicle according to claim 13, characterized in that, The method further includes: When the all-terrain vehicle performs downhill braking, adjusting the engine speed according to the corresponding relationship information between the vehicle speed of the all-terrain vehicle and the engine speed; wherein, the corresponding relationship information includes a first data set and a second data set; the first data set is the preset curve information or preset correspondence table information of the vehicle speed and the engine speed when the all-terrain vehicle is in a high gear, and the second data set is the preset curve information or preset correspondence table information of the vehicle speed and the engine speed when the all-terrain vehicle is in a low gear.

15. The downhill braking method of the all-terrain vehicle according to claim 13, wherein Before controlling the all-terrain vehicle to perform downhill braking, the method further includes: Obtaining the gear of the all-terrain vehicle; If the all-terrain vehicle is in the first gear and the vehicle speed of the all-terrain vehicle is not less than the first speed, activating the downhill braking function; and / or If the all-terrain vehicle is in the second gear and the vehicle speed of the all-terrain vehicle is not less than the second speed, activating the downhill braking function; wherein, the first speed is greater than the second speed, the first gear is a high gear, and the second gear is a low gear.

16. The downhill braking method of an all-terrain vehicle according to claim 13, characterized in that, The method further includes: When the all-terrain vehicle performs downhill braking, if the offset of the throttle pedal is greater than the second stroke threshold and the vehicle speed of the all-terrain vehicle is less than the safe vehicle speed, turning off the downhill braking; wherein, the second stroke threshold is greater than the first stroke threshold.

17. The downhill braking method of an all-terrain vehicle according to any one of claims 13-16, characterized in that, The method further includes obtaining the pitch angle of the all-terrain vehicle; The conditions for controlling the all-terrain vehicle to perform downhill braking further include: the pitch angle of the all-terrain vehicle is within a preset angle range and persists for the preset time.

18. The downhill braking method of the all-terrain vehicle according to claim 13, wherein, The method further includes: When controlling the all-terrain vehicle to perform downhill braking, if the offset of the accelerator pedal is greater than the third stroke threshold for the continuous calibration time and the throttle opening of the all-terrain vehicle is greater than the opening threshold, the downhill braking is turned off; wherein, the third stroke threshold is greater than the first stroke threshold.

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