Vehicle detection method, device and vehicle

Abstract

The present invention discloses a vehicle detection method, device, and vehicle. The method comprises: obtaining first vehicle status information and a rear drive axle differential lock status signal; determining the vehicle's operating condition based on the first vehicle status information; obtaining second vehicle status information when the rear drive axle differential lock status signal indicates a locked state; and sending a torque limit request to the transmission when the second vehicle status information satisfies a preset condition corresponding to the vehicle's operating condition, so that the transmission limits the engine's high torque transmission. By detecting the current operating condition, when the differential lock is locked and it is detected that the current operating condition has a risk of rear axle fracture, a torque limit request is sent to the transmission so that the transmission limits the engine's high torque transmission. This avoids the possibility of rear axle housing fracture and half-shaft twisting caused by the engine maintaining high torque output, thereby improving safety.

Description

Technical Field

[0001] The present invention relates to the field of automobile technology, and in particular to a vehicle detection method, device and vehicle. Background Art

[0002] With the development of social economy, off-road vehicles have become more and more popular. However, when driving on rocky roads or in a high-speed driving situation, off-road vehicles are prone to malfunctions such as rear axle housing fracture when the vehicle is freed from the rock or lands at high speed, posing a safety hazard. Summary of the Invention

[0003] Based on the above problems, the present invention provides a vehicle detection method, device and vehicle, which can limit the high torque output of the engine when detecting that the vehicle is in a rock escape or flying state, so as to improve vehicle safety.

[0004] The present invention discloses the following technical solutions:

[0005] A first aspect of the present invention provides a vehicle detection method, the method comprising:

[0006] Acquiring first vehicle status information and a rear drive axle differential lock status signal;

[0007] determining a vehicle operating condition based on the first vehicle status information;

[0008] When the rear drive axle differential lock state signal indicates a locked state, obtaining second vehicle state information;

[0009] When the second vehicle state information satisfies a preset condition corresponding to the working condition of the vehicle, a torque limit request is sent to the transmission so that the transmission limits the high torque transmission of the engine.

[0010] In one possible implementation, the first vehicle state information includes: an all-terrain mode signal;

[0011] The determining the operating condition of the vehicle according to the first vehicle state information includes:

[0012] According to the all-terrain mode signal being a rocky terrain signal, determining that the vehicle is in a rocky working condition;

[0013] The second vehicle state information includes: current driving mode information, engine speed, accelerator pedal opening information, front wheel speed and rear wheel speed;

[0014] When the second vehicle state information satisfies a preset condition corresponding to the vehicle's operating condition, sending a torque limit request to the transmission includes:

[0015] When the driving mode information is low-speed four-wheel drive mode information, the engine speed is greater than a first preset value, the accelerator pedal opening is greater than a first opening threshold and the difference between the front wheel speed and the rear wheel speed is greater than a first wheel speed difference threshold, or the rear wheel speed is less than a speed threshold, a torque limit request is sent to the transmission.

[0016] In one possible implementation, while obtaining the first vehicle status information and the rear drive axle differential lock status signal, the method further includes: obtaining a front axle differential lock status signal;

[0017] The rear drive axle differential lock state signal indicates a locked state, and obtaining the second vehicle state information includes:

[0018] When the front axle differential lock state signal and the rear drive axle differential lock state signal are both characterized as being in a locked state, obtaining second vehicle state information;

[0019] The second vehicle status information further includes: transfer case type information;

[0020] When the second vehicle state information satisfies a preset condition corresponding to the vehicle's operating condition, sending a torque limit request to the transmission also includes:

[0021] When the drive mode information is low-speed four-wheel drive mode information, the engine speed is greater than a first preset value, the accelerator pedal opening is greater than a first opening threshold and the difference between the front wheel speed and the rear wheel speed is greater than a second wheel speed difference threshold, or the rear wheel speed is less than the speed threshold, a torque limit request is sent to the transmission; the second wheel speed difference threshold is a preset value corresponding to the transfer case type information.

[0022] In a possible implementation, the first vehicle state information includes: vehicle speed, vehicle speed change rate, and vehicle body posture;

[0023] Determining the operating condition of the vehicle according to the first vehicle state information includes:

[0024] When the vehicle speed is greater than a first vehicle speed threshold, the vehicle speed change rate is greater than a change rate threshold, and the vehicle body tilt angle is greater than a preset angle for a first preset time, it is determined that the vehicle is in a slope running condition;

[0025] The second vehicle state information includes: current driving mode information, minimum ground clearance of the rear drive axle, engine speed and accelerator pedal opening information;

[0026] When the second vehicle state information satisfies a preset condition corresponding to the vehicle's operating condition, sending a torque limit request to the transmission includes:

[0027] When the drive mode information is a high-speed four-wheel drive mode signal or a high-speed two-wheel drive mode signal, the minimum ground clearance of the rear drive axle is greater than the distance threshold for a second preset time, the engine speed is greater than a second preset value, and the accelerator pedal opening is greater than a second opening threshold, a torque limit request is sent to the transmission.

[0028] In one possible implementation, after sending the torque limit request to the transmission, the method further includes: sending a request to cancel the torque limit to the transmission when the difference between the front wheel speed and the rear wheel speed is less than a third wheel speed difference threshold.

[0029] In one possible implementation, after sending the torque limit request to the transmission, the method further includes: sending a request to cancel the torque limit to the transmission when the current vehicle speed is less than a second vehicle speed threshold.

[0030] In one possible implementation, before the rear drive axle differential lock state signal indicates a locked state and the second vehicle state information is obtained, the method further includes:

[0031] Obtaining a transmission gear position signal;

[0032] It is determined that the vehicle is in a driving state according to the transmission gear position signal.

[0033] A second aspect of the present invention provides a vehicle detection device, comprising:

[0034] A first acquiring unit, configured to acquire first vehicle status information and a rear drive axle differential lock status signal;

[0035] an operating condition determining unit, configured to determine an operating condition of the vehicle based on the first vehicle state information;

[0036] a second acquiring unit, configured to acquire second vehicle state information when the rear drive axle differential lock state signal indicates a locked state;

[0037] The sending unit is used to send a torque limit request to the transmission when the second vehicle status information meets the preset conditions corresponding to the working condition of the vehicle, so that the transmission limits the high torque transmission of the engine.

[0038] In one possible implementation, the first vehicle state information includes: an all-terrain mode signal;

[0039] The operating condition determination unit is specifically configured to:

[0040] According to the all-terrain mode signal being a rocky terrain signal, determining that the vehicle is in a rocky working condition;

[0041] The second vehicle state information includes: current driving mode information, engine speed, accelerator pedal opening information, front wheel speed and rear wheel speed;

[0042] The sending unit is specifically configured to:

[0043] When the driving mode information is low-speed four-wheel drive mode information, the engine speed is greater than a first preset value, the accelerator pedal opening is greater than a first opening threshold and the difference between the front wheel speed and the rear wheel speed is greater than a speed difference threshold, or the rear wheel speed is less than a wheel speed threshold, a torque limit request is sent to the transmission.

[0044] A third aspect of the present invention provides a vehicle, comprising a differential lock controller, configured to execute the method as described in any one of the first aspects of the present invention.

[0045] Compared with the prior art, the present invention has the following beneficial effects:

[0046] The present invention provides a vehicle detection method, comprising: obtaining first vehicle status information and a rear drive axle differential lock status signal; determining the vehicle's operating condition based on the first vehicle status information; obtaining second vehicle status information when the rear drive axle differential lock status signal indicates a locked state; and, when the second vehicle status information satisfies a preset condition corresponding to the vehicle's operating condition, sending a torque limit request to the transmission to cause the transmission to limit the engine's high torque transmission. The present invention detects the current operating condition and, when the differential lock is locked, sends a torque limit request to the transmission to cause the transmission to limit the engine's high torque transmission if it detects a risk of rear axle fracture in the current operating condition. This prevents rear axle housing fracture and half-shaft twisting caused by the engine maintaining high torque output, thereby improving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0048] Figure 1 A flow chart of a vehicle detection method provided by an embodiment of the present invention;

[0049] Figure 2 A flow chart of another vehicle detection method provided by an embodiment of the present invention;

[0050] Figure 3 A flow chart of another vehicle detection method provided by an embodiment of the present invention;

[0051] Figure 4 A flow chart of another vehicle detection method provided by an embodiment of the present invention;

[0052] Figure 5 This is a structural diagram of a vehicle detection device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0053] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0054] The differential on a vehicle distributes power. Depending on its installation location, it can be classified as a front drive axle differential, a center differential, or a rear drive axle differential. A differential lock limits the difference in power output between the two output terminals of the differential, effectively negating the differential's function and locking the two output terminals together. Depending on their placement, they are classified as front drive axle differential lock, center differential lock, and rear drive axle differential lock. A differential lock uses a tooth mechanism to connect the two output terminals of the differential, forcing them to synchronize speeds. The drive axle differential lock operates as follows: the ECU (Electronic Control Unit) controls the differential lock control unit to output an electrical signal, which drives the electromagnetic coil to generate magnetic force, displacing the locking ring. This, in turn, engages the locking gear, locking the differential lock, locking the differential case and the axle shafts together, deactivating the differential lock's differential capability and transferring torque to the active wheel.

[0055] As mentioned above, when an off-road vehicle is on a rocky road or on a steep slope, the differential lock is locked and the engine maintains a high torque output, which can easily cause the rear drive axle housing to break, posing a safety hazard.

[0056] In view of this, the present invention provides a vehicle detection method, device, and vehicle. The method includes: obtaining first vehicle status information and a rear drive axle differential lock status signal; determining the vehicle's operating condition based on the first vehicle status information; obtaining second vehicle status information when the rear drive axle differential lock status signal indicates a locked state; and when the second vehicle status information satisfies a preset condition corresponding to the vehicle's operating condition, sending a torque limit request to the transmission to cause the transmission to limit the engine's high torque transmission. By detecting the current operating condition, when the differential lock is locked and it is detected that the current operating condition carries a risk of rear axle fracture, a torque limit request is sent to the transmission to cause the transmission to limit the engine's high torque transmission. This avoids the possibility of rear axle housing fracture and half-shaft twisting caused by the engine maintaining high torque output, thereby improving safety.

[0057] See also Figure 1, which is a flow chart of a vehicle detection method provided by an embodiment of the present invention. This method can be applied to a differential lock controller. Figure 1 As shown, the method includes:

[0058] S110, obtaining first vehicle status information and a rear drive axle differential lock status signal;

[0059] S120: Determine the operating condition of the vehicle based on the first vehicle state information;

[0060] S130, when the rear drive axle differential lock state signal indicates a locked state, obtaining second vehicle state information;

[0061] S140: When the second vehicle state information satisfies a preset condition corresponding to the working condition of the vehicle, a torque limit request is sent to the transmission so that the transmission limits the high torque transmission of the engine.

[0062] The preset condition is vehicle driving status information that may cause vehicle failure under the vehicle's working conditions.

[0063] In one example, the preset condition in the rock working condition is the vehicle driving state information in the rock escape condition (such as the rear wheel is stuck). The preset condition in the slope working condition is the vehicle driving state information in the slope running condition.

[0064] This invention detects the current operating condition and, when the differential is locked, sends a torque limit request to the transmission if it detects a risk of rear axle fracture. This limits the engine's high torque output, preventing rear axle housing fracture and axle half-shaft breakage caused by sustained high engine torque output, thereby improving safety.

[0065] The wheels may get stuck under rocky working conditions, and the rear drive axle may easily break when the vehicle refuels and escapes.

[0066] In some embodiments, the first vehicle status information includes: a transmission gear position signal, current driving mode information, and an all-terrain mode signal;

[0067] The transmission gear position signal includes: a low gear signal or a high gear signal. The drive mode information includes: four-wheel drive mode information or two-wheel drive mode information. The differential lock state signal includes: locked or open.

[0068] For example, the speed in the low-speed four-wheel drive state generally does not exceed 40 km / h, and the speed in the high-speed four-wheel drive state is generally 40-120 km / h.

[0069] For example, the vehicle gear information can be obtained by a gear sensor. The user can set the vehicle four-wheel drive mode or two-wheel drive mode by a button displayed on the vehicle display.

[0070] The S120 includes:

[0071] Determining that the vehicle is in a rocky operating condition based on a transmission low gear signal, four-wheel drive mode information, and an all-terrain mode signal being a rocky terrain signal;

[0072] The second vehicle status information includes: engine speed, accelerator pedal opening information, front wheel speed and rear wheel speed;

[0073] For example, the accelerator pedal opening information may be obtained via an accelerator sensor installed on the accelerator pedal.

[0074] The S140 includes:

[0075] When the engine speed is greater than a first preset value, the accelerator pedal opening is greater than a first opening threshold and the difference between the front wheel speed and the rear wheel speed is greater than a first wheel speed difference threshold, or the rear wheel speed is less than a wheel speed threshold, a torque limit request is sent to the transmission.

[0076] Exemplarily, the first preset value, the first opening threshold, the first wheel speed difference threshold, and the wheel speed threshold can be set in advance. For example, the first preset value is set to 1500r / min, the first opening threshold is set to 20%, the first wheel speed difference threshold is set to 50r / min, and the wheel speed threshold is close to 0.

[0077] Figure 2 Another vehicle detection method flow chart provided by the embodiment of the present invention is as follows: Figure 2 As shown, the method includes:

[0078] S210, obtaining a transmission gear position signal, and determining that the vehicle is in a low-speed driving state according to the transmission low-speed gear position signal;

[0079] S220 : Acquire an all-terrain mode signal, and determine that the vehicle is in a rocky working condition based on the all-terrain mode signal being a rocky terrain signal.

[0080] S230: Acquire a differential lock state signal to determine whether only the rear axle differential lock is in a locked state, or whether both the front axle differential lock and the rear axle differential lock are in a locked state.

[0081] S240: Obtain current driving mode information, engine speed, and accelerator pedal opening information.

[0082] S250. In the low-speed four-wheel drive mode, when the engine speed is greater than a first preset value and the accelerator pedal opening is greater than a first opening threshold, obtain the front wheel speed and the rear wheel speed.

[0083] When the vehicle is in low-speed gear of the transmission and low-speed four-wheel drive mode, the engine torque output is large. Furthermore, when the engine speed is greater than a first preset value and the accelerator pedal opening is greater than a first opening threshold, it can be determined that the vehicle is in a low-gear high-torque output stage. It is necessary to further determine whether the rear wheels are stuck (i.e., rock escape state) based on the front wheel speed and the rear wheel speed.

[0084] S260: When the difference between the front wheel speed and the rear wheel speed is greater than the speed difference threshold, or the rear wheel speed is less than the wheel speed threshold, send a torque limit request to the transmission to enable the transmission to limit the high torque transmission of the engine.

[0085] When the vehicle is in the low-gear high-torque output stage, based on the difference between the front wheel speed and the rear wheel speed being greater than the speed difference threshold, or the rear wheel speed being less than the wheel speed threshold, it can be determined that the rear wheel is stuck. When the vehicle is in a rocky working condition and trying to escape, the engine maintains a high torque output, causing the torque of the rear drive axle load of the vehicle to be large, which can easily cause the drive axle to break. In order to avoid the failure of the drive axle breaking, the differential lock controller sends a torque limit request to the transmission when it detects that the difference between the front wheel speed and the rear wheel speed is greater than the speed difference threshold, or the rear wheel speed is less than the wheel speed threshold, so that the transmission limits the engine's high torque transmission.

[0086] S270: When the difference between the front wheel speed and the rear wheel speed is less than the third wheel speed difference threshold, send a request to the transmission to cancel the torque limit.

[0087] It should be noted that the embodiment of the present invention does not limit the execution order of S210, S220 and S230. In a possible implementation, S210, S220 and S230 may be executed simultaneously, or S220 may be executed first, and then S210 and S230.

[0088] The embodiment of the present invention obtains the vehicle's driving status information in real time. After determining that the vehicle is in a rocky working condition, when the vehicle's driving status information reaches a preset condition that may cause a rear axle fracture failure (due to the rear wheel being stuck and needing to escape in the rocky working condition), a torque limit request is sent to the transmission to enable the transmission to limit the engine's high torque transmission, thereby avoiding a rear axle housing fracture failure caused by the engine maintaining a high torque output when escaped from the rocky working condition.

[0089] In some embodiments, the first vehicle status information further includes: a front axle differential lock status signal;

[0090] The S130 includes:

[0091] The front axle differential lock state signal and the rear drive axle differential lock state signal are both characterized as being in a locked state, and second vehicle state information is obtained;

[0092] The second vehicle status information further includes: transfer case type information;

[0093] The S140 includes:

[0094] When the engine speed is greater than a first preset value, the accelerator pedal opening is greater than a first opening threshold and the difference between the front wheel speed and the rear wheel speed is greater than a second wheel speed difference threshold, or when the rear wheel speed is less than the speed threshold, a torque limit request is sent to the transmission; the second wheel speed difference threshold is a preset value corresponding to the transfer case type information.

[0095] Figure 3 This is a flow chart of another vehicle detection method provided by an embodiment of the present invention, which is a vehicle detection method under rock escape conditions. Figure 3 As shown, the method includes:

[0096] S310, obtaining a transmission gear position signal, and determining that the vehicle is in a low-speed driving state according to the transmission low-speed gear position signal;

[0097] S320: Acquire an all-terrain mode signal, and determine that the vehicle is in a rocky working condition based on the all-terrain mode signal being a rocky terrain signal.

[0098] S330: Acquire a differential lock status signal and determine that both the front axle differential lock and the rear axle differential lock are in a locked state.

[0099] S340: Obtain current driving mode information, engine speed, and accelerator pedal opening information.

[0100] S350: In the low-speed four-wheel drive mode, when the engine speed is greater than a first preset value and the accelerator pedal opening is greater than a first opening threshold, obtain the front wheel speed and the rear wheel speed.

[0101] S360, obtaining transfer case type information;

[0102] S370: When the difference between the front wheel speed and the rear wheel speed is greater than a second wheel speed difference threshold, or when the rear wheel speed is less than a speed threshold, a torque limit request is sent to the transmission to cause the transmission to limit the high torque transmission of the engine; the second wheel speed difference threshold is a preset value corresponding to the transfer case type information.

[0103] This embodiment Figure 2 In addition to the illustrated embodiment, a second-wheel speed differential threshold corresponding to the transfer case type is added as a criterion for rock escape scenarios. Different transfer case types correspond to different second-wheel speed differential thresholds, resulting in different rock escape criteria and, consequently, different conditions for issuing a torque limit request.

[0104] S380: When the difference between the front wheel speed and the rear wheel speed is less than the third wheel speed difference threshold, send a request to the transmission to cancel the torque limit.

[0105] It should be noted that the embodiment of the present invention does not limit the execution order of S310 and S320. In one possible implementation, S310 and S320 can be executed simultaneously, or S320 can be executed first and then S320. The embodiment of the present invention also does not limit the execution order of S350 and S360. In one possible implementation, S350 and S360 can be executed simultaneously, or S360 can be executed first and then S350.

[0106] When the vehicle breaks through, there is a flying slope situation. After the vehicle flies up and lands, if the engine still maintains a large torque output, the wheels will impact the drive axle at the moment of landing. At the same time, a large torque is input to the drive axle, which can easily cause the drive axle to break.

[0107] In some embodiments, the first vehicle state information includes: a transmission gear position signal, current driving mode information, vehicle speed, vehicle speed change rate, and vehicle body posture;

[0108] For example, the vehicle body posture can be obtained through vehicle body sensors.

[0109] The S120 includes:

[0110] In the presence of a high transmission gear signal, a four-wheel drive mode signal, or a two-wheel drive mode signal, when the vehicle speed is greater than a first vehicle speed threshold, the vehicle speed change rate is greater than a change rate threshold, and the vehicle body tilt angle is greater than a preset angle for a first preset time, determining that the vehicle is in a slope condition;

[0111] The second vehicle status information includes: minimum ground clearance of the rear drive axle, engine speed and accelerator pedal opening information;

[0112] For example, a distance measuring device such as a sensor or a radar may be provided on the rear drive axle of the vehicle to obtain the minimum ground clearance of the rear drive axle.

[0113] The S140 includes:

[0114] When the minimum ground clearance of the rear drive axle is greater than the distance threshold for a second preset time, the engine speed is greater than a second preset value, and the accelerator pedal opening is greater than a second opening threshold, a torque limit request is sent to the transmission.

[0115] Exemplarily, the distance threshold, the second preset value of the engine speed, and the second opening threshold of the accelerator pedal can be pre-set. For example, the distance threshold is set to 350 mm, the second preset value of the engine speed is set to 1800 r / min, and the second opening threshold of the accelerator pedal is set to 15%.

[0116] Figure 4 Another vehicle detection method flow chart provided by the embodiment of the present invention is a vehicle detection method under a flying slope condition. Figure 4 As shown, the method includes:

[0117] S410: Acquire a transmission gear position signal, and determine whether the vehicle is in a driving state according to the transmission low-speed gear position signal.

[0118] S420: Obtain current vehicle speed and vehicle posture information.

[0119] S430: When the vehicle speed is greater than a first vehicle speed threshold, calculate a rate of change of the vehicle speed.

[0120] S440: When the vehicle speed change rate is greater than the change rate threshold and the vehicle body posture inclination angle is greater than a preset angle for a first preset time, determine that the vehicle is in a slope-rushing condition.

[0121] S450: Acquire a differential lock status signal and determine that only the rear axle differential lock is in a locked state.

[0122] S460: Acquire driving mode information and rear axle minimum ground clearance. When the driving mode signal is a high-speed four-wheel drive mode signal or a high-speed two-wheel drive signal and the minimum ground clearance is greater than a distance threshold for a second preset time, acquire engine speed and accelerator pedal opening information.

[0123] After determining that the vehicle is in a slope-rushing condition, the vehicle is determined to be in a slope-rushing state based on the minimum ground clearance of the rear axle being greater than a distance threshold.

[0124] S470: When the engine speed is greater than a second preset value and the accelerator pedal opening is greater than a second opening threshold, a torque limit request is sent to the transmission to enable the transmission to limit the high torque transmission of the engine.

[0125] After entering the flying slope state, the accelerator pedal opening and engine speed information meet the preset conditions to determine that there is no power attenuation before the vehicle lands. In this case, in order to avoid large input torque to the rear axle at the moment of landing, the differential lock controller sends a torque limit request to the differential to enable the transmission to limit the high torque transmission of the engine.

[0126] S480: After sending the torque limit request to the transmission, the method further includes: sending a request to cancel the torque limit to the transmission when the current vehicle speed is less than a second vehicle speed threshold.

[0127] The embodiment of the present invention obtains the vehicle's driving status information in real time. After determining that the vehicle is in a slope condition, when the vehicle's driving status information reaches a preset condition that may cause a rear axle fracture failure (such as a slope state), a torque limit request is sent to the transmission to enable the transmission to limit the engine's high torque transmission, thereby avoiding a rear axle housing fracture failure caused by the engine maintaining a high torque output in the slope state.

[0128] Figure 5A structural diagram of a vehicle detection device provided by an embodiment of the present invention is shown as follows: Figure 5 As shown, the device includes:

[0129] A first acquiring unit 510 is configured to acquire first vehicle status information and a rear drive axle differential lock status signal;

[0130] an operating condition determination unit 520, configured to determine an operating condition of the vehicle based on the first vehicle state information;

[0131] The second acquiring unit 530 is configured to acquire second vehicle state information when the rear drive axle differential lock state signal indicates a locked state;

[0132] The sending unit 540 is configured to send a torque limit request to the transmission when the second vehicle state information satisfies a preset condition corresponding to the working condition of the vehicle, so that the transmission limits the high torque transmission of the engine.

[0133] This invention detects the current operating condition and, when the differential is locked, sends a torque limit request to the transmission if it detects a risk of rear axle fracture. This limits the engine's high torque output, preventing rear axle housing fracture and axle half-shaft breakage caused by sustained high engine torque output, thereby improving safety.

[0134] In some embodiments, the first vehicle status information includes: an all-terrain mode signal;

[0135] The operating condition determination unit 520 is specifically configured to:

[0136] According to the change of the all-terrain mode signal to a rocky terrain signal, it is determined that the vehicle is in a rocky working condition;

[0137] The second vehicle state information includes: current driving mode information, driving mode information is low-speed four-wheel drive mode information, engine speed, accelerator pedal opening information, front wheel speed and rear wheel speed;

[0138] The sending unit 540 is specifically configured to:

[0139] When the engine speed is greater than a first preset value, the accelerator pedal opening is greater than a first opening threshold, and the difference between the front wheel speed and the rear wheel speed is greater than a speed difference threshold, or the rear wheel speed is less than a wheel speed threshold, a torque limit request is sent to the transmission.

[0140] In some embodiments, the first acquiring unit 510 is further configured to acquire a front axle differential lock state signal;

[0141] The operating condition determination unit 520 is specifically configured to: obtain second vehicle state information when both the front axle differential lock state signal and the rear drive axle differential lock state signal indicate a locked state;

[0142] The second vehicle status information further includes: transfer case type information;

[0143] The sending unit 540 is further specifically configured to:

[0144] When the drive mode information is low-speed four-wheel drive mode information, the engine speed is greater than a first preset value, the accelerator pedal opening is greater than a first opening threshold and the difference between the front wheel speed and the rear wheel speed is greater than a second wheel speed difference threshold, or the rear wheel speed is less than the speed threshold, a torque limit request is sent to the transmission; the second wheel speed difference threshold is a preset value corresponding to the transfer case type information.

[0145] In some embodiments, the first vehicle state information includes: vehicle speed, vehicle speed change rate, and vehicle body posture;

[0146] The operating condition determination unit 520 is specifically configured to:

[0147] When the vehicle speed is greater than a first vehicle speed threshold, the vehicle speed change rate is greater than a change rate threshold, and the vehicle body tilt angle is greater than a preset angle for a first preset time, it is determined that the vehicle is in a slope running condition;

[0148] The second vehicle state information includes: current driving mode information, minimum ground clearance of the rear drive axle, engine speed and accelerator pedal opening information;

[0149] The sending unit 540 is specifically configured to:

[0150] When the drive mode information is a high-speed four-wheel drive mode signal or a high-speed two-wheel drive mode signal, the minimum ground clearance of the rear drive axle is greater than the distance threshold for a second preset time, the engine speed is greater than a second preset value, and the accelerator pedal opening is greater than a second opening threshold, a torque limit request is sent to the transmission.

[0151] In some embodiments, after sending the torque limit request to the transmission, the sending unit 540 further comprises: sending a request to cancel the torque limit to the transmission when the difference between the front wheel speed and the rear wheel speed is less than a third wheel speed difference threshold.

[0152] In some embodiments, after the sending unit 540 sends the torque limit request to the transmission, the method further comprises: sending a request to cancel the torque limit to the transmission when the current vehicle speed is less than a second vehicle speed threshold.

[0153] In some embodiments, the first acquiring unit 510 is further configured to acquire a transmission gear position signal;

[0154] The device further comprises a driving state determination unit for determining whether the vehicle is in a driving state according to the transmission gear position signal.

[0155] An embodiment of the present invention provides a vehicle, including a differential lock controller, configured to execute a detection method as provided in an embodiment of the present invention.

[0156] This invention detects the current operating condition and, when the differential is locked, sends a torque limit request to the transmission if it detects a risk of rear axle fracture. This limits the engine's high torque output, preventing rear axle housing fracture and axle half-shaft breakage caused by sustained high engine torque output, thereby improving safety.

[0157] It should be noted that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device and system embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiments. The device and system embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components indicated as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the scheme of this embodiment. A person of ordinary skill in the art can understand and implement it without expending creative work.

[0158] The above is merely one specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A vehicle detection method, characterized in that: The method comprises: Acquiring first vehicle status information and a rear drive axle differential lock status signal; determining a vehicle operating condition based on the first vehicle status information; When the rear drive axle differential lock state signal indicates a locked state, obtaining second vehicle state information; When the second vehicle state information satisfies a preset condition corresponding to the vehicle's operating condition, sending a torque limit request to the transmission so that the transmission limits the high torque transmission of the engine; The first vehicle state information includes: an all-terrain mode signal; The determining the operating condition of the vehicle according to the first vehicle state information includes: According to the all-terrain mode signal being a rocky terrain signal, determining that the vehicle is in a rocky working condition; The second vehicle state information includes: current driving mode information, engine speed, accelerator pedal opening information, front wheel speed and rear wheel speed; When the second vehicle state information satisfies a preset condition corresponding to the rocky working condition of the vehicle, sending a torque limit request to the transmission includes: When the driving mode information is low-speed four-wheel drive mode information, the engine speed is greater than a first preset value, the accelerator pedal opening is greater than a first opening threshold and the difference between the front wheel speed and the rear wheel speed is greater than a first wheel speed difference threshold, or the rear wheel speed is less than a speed threshold, a torque limit request is sent to the transmission.

2. The method according to claim 1, characterized in that While obtaining the first vehicle status information and the rear drive axle differential lock status signal, the method further includes: obtaining a front axle differential lock status signal; The rear drive axle differential lock state signal indicates a locked state, and obtaining the second vehicle state information includes: When the front axle differential lock state signal and the rear drive axle differential lock state signal are both characterized as being in a locked state, obtaining second vehicle state information; The second vehicle status information further includes: transfer case type information; When the second vehicle state information satisfies a preset condition corresponding to the vehicle's operating condition, sending a torque limit request to the transmission also includes: When the drive mode information is low-speed four-wheel drive mode information, the engine speed is greater than a first preset value, the accelerator pedal opening is greater than a first opening threshold and the difference between the front wheel speed and the rear wheel speed is greater than a second wheel speed difference threshold, or the rear wheel speed is less than the speed threshold, a torque limit request is sent to the transmission; the second wheel speed difference threshold is a preset value corresponding to the transfer case type information.

3. The method according to claim 1, characterized in that The first vehicle state information also includes: vehicle speed, vehicle speed change rate and vehicle body posture; Determining the operating condition of the vehicle according to the first vehicle state information includes: When the vehicle speed is greater than a first vehicle speed threshold, the vehicle speed change rate is greater than a change rate threshold, and the vehicle body tilt angle is greater than a preset angle for a first preset time, it is determined that the vehicle is in a slope running condition; The second vehicle state information includes: current driving mode information, minimum ground clearance of the rear drive axle, engine speed and accelerator pedal opening information; When the second vehicle state information satisfies a preset condition corresponding to the vehicle's hill-climbing working condition, sending a torque limit request to the transmission includes: When the drive mode information is a high-speed four-wheel drive mode signal or a high-speed two-wheel drive mode signal, the minimum ground clearance of the rear drive axle is greater than the distance threshold for a second preset time, the engine speed is greater than a second preset value, and the accelerator pedal opening is greater than a second opening threshold, a torque limit request is sent to the transmission.

4. The method according to claim 1, wherein After sending the torque limit request to the transmission, the method further includes: sending a request to cancel the torque limit to the transmission when the difference between the front wheel speed and the rear wheel speed is less than a third wheel speed difference threshold.

5. The method according to claim 3, characterized in that After sending the torque limit request to the transmission, the method further includes: sending a request to cancel the torque limit to the transmission when the current vehicle speed is less than a second vehicle speed threshold.

6. The method according to any one of claims 1 to 5, characterized in that When the rear drive axle differential lock state signal indicates a locked state, before obtaining the second vehicle state information, the method further includes: Obtaining a transmission gear position signal; It is determined that the vehicle is in a driving state according to the transmission gear position signal.

7. A vehicle detection device, characterized in that: The device comprises: A first acquiring unit, configured to acquire first vehicle status information and a rear drive axle differential lock status signal; an operating condition determining unit, configured to determine an operating condition of the vehicle based on the first vehicle state information; a second acquiring unit, configured to acquire second vehicle state information when the rear drive axle differential lock state signal indicates a locked state; a sending unit, configured to send a torque limit request to the transmission when the second vehicle state information satisfies a preset condition corresponding to the vehicle's operating condition, so that the transmission limits the transmission of high torque from the engine; The first vehicle state information includes: an all-terrain mode signal; The operating condition determination unit is specifically configured to: According to the all-terrain mode signal being a rocky terrain signal, determining that the vehicle is in a rocky working condition; The second vehicle state information includes: current driving mode information, engine speed, accelerator pedal opening information, front wheel speed and rear wheel speed; The sending unit is specifically configured to: When the driving mode information is low-speed four-wheel drive mode information, the engine speed is greater than a first preset value, the accelerator pedal opening is greater than a first opening threshold and the difference between the front wheel speed and the rear wheel speed is greater than a speed difference threshold, or the rear wheel speed is less than a wheel speed threshold, a torque limit request is sent to the transmission.

8. A vehicle, characterized in that: The invention comprises a differential lock controller for executing the method according to any one of claims 1 to 6.

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