A method and device for controlling starting of a dual clutch transmission vehicle and a storage medium

Abstract

The application discloses a kind of double clutch transmission vehicle starting control method, device and storage medium.Therein, method includes: by detecting current oil temperature in transmission, when current oil temperature in transmission is less than first set threshold, it is judged whether vehicle is in hill parking state;When vehicle is in uphill state or flat road state, according to current oil temperature in transmission and the slope value of the hill where vehicle is located, the highest temperature of the clutch on the second transmission shaft in the second gear starting state is calculated;When the highest temperature is greater than second set temperature threshold, control vehicle to start in first gear;When the highest temperature is less than or equal to second set temperature threshold, control vehicle to start in second gear.The technical scheme provided by the embodiment of the application effectively shortens the vehicle starting time under low temperature state while avoiding clutch overtemperature, so that the vehicle starting process is more rapid and reliable.

Description

Technical Field

[0001] This invention relates to the field of vehicle control technology, and in particular to a method, device and storage medium for starting control of a vehicle with a dual-clutch transmission. Background Technology

[0002] With the development of automotive technology, automatic transmissions are being used more and more widely. Among the many types of automatic transmissions, dual-clutch transmissions hold a pivotal position in the global automotive market.

[0003] Currently, vehicles equipped with dual-clutch transmissions typically start in first gear. To enable the vehicle to start quickly, the first and second drive shafts of the transmission are usually pre-engaged. When a gear shift is needed, it can be achieved quickly by controlling the disengagement and engagement of the clutches. However, at low temperatures, due to the high viscosity of the transmission fluid, the resistance during the shift fork engagement and disengagement process is greater, making it impossible for the shift fork to directly engage the corresponding gear. Therefore, starting in second gear is adopted.

[0004] Existing technology for second-gear start control strategies determines the start mode by detecting clutch oil temperature. The control method is as follows: The automatic transmission control unit (TCU) analyzes the driver's intention based on information transmitted from the shift lever position sensor to determine whether to enter the start control mode; based on information transmitted from the clutch oil temperature sensor, it analyzes and determines whether to enter the first-gear start control mode or the second-gear start control mode; after selecting the control mode, it commands the corresponding gear shift fork to engage the transmission gear of the current gear, and then controls the corresponding clutch to engage, realizing power transmission and thus completing the start.

[0005] However, when performing start-up control, there are problems such as slow start-up, long clutch slippage time, and high heat generation, which poses a risk of clutch overheating. This means that the vehicle may roll backwards on a slope due to lack of starting power. At the same time, due to the high viscosity of the oil at low temperatures, the transmission begins to supply cooling and lubrication flow when the driver performs gear shifting operations, which in turn prevents the shift fork from directly engaging the corresponding gear. Summary of the Invention

[0006] This invention provides a dual-clutch transmission start-up control method, device, and storage medium, which can effectively shorten vehicle start-up time and prevent the shift fork from failing to engage the corresponding gear.

[0007] According to one aspect of the present invention, a vehicle start-up control method for a dual-clutch transmission is provided. The dual-clutch transmission includes a first driveshaft and a second driveshaft, wherein the first driveshaft is used to control odd-numbered gears, and the second driveshaft is used to control even-numbered gears; the vehicle start-up control method for the dual-clutch transmission includes:

[0008] When the current oil temperature in the transmission is lower than a first set threshold, determine whether the vehicle is in a hill-start parking state.

[0009] When the vehicle is in an uphill or flat road condition, the highest temperature of the clutch on the second drive shaft in the second gear start state is calculated based on the current transmission fluid temperature and the slope of the road where the vehicle is located.

[0010] When the highest temperature is greater than the second set temperature threshold, the vehicle is controlled to start in first gear; when the highest temperature is less than or equal to the second set temperature threshold, the vehicle is controlled to start in second gear.

[0011] Optionally, before the current oil temperature in the transmission is lower than a first preset threshold, the method further includes:

[0012] Determine whether the current transmission fluid temperature is lower than the first set threshold.

[0013] If the current transmission fluid temperature is less than the first set threshold, then determine whether the vehicle is in an uphill or flat-slope state.

[0014] If the current transmission fluid temperature is greater than or equal to the first set threshold, then the vehicle is controlled to start in first gear.

[0015] Optionally, after determining whether the vehicle is in a hilly parking state, the method further includes:

[0016] When the vehicle is going downhill, control the vehicle to start in first gear.

[0017] Optionally, controlling the vehicle to start in first gear when the highest temperature exceeds a second set temperature threshold includes:

[0018] The gear on the first drive shaft is set to first gear and the gear on the second drive shaft is set to second gear.

[0019] Optionally, controlling the vehicle to start in second gear when the highest temperature is less than or equal to a second set temperature threshold includes:

[0020] The gear on the first drive shaft is set to reverse, and the gear on the second drive shaft is set to second gear.

[0021] Optionally, after the gear on the first drive shaft is pre-engaged to first gear and the gear on the second drive shaft is pre-engaged to second gear, the method further includes:

[0022] Get external gear command;

[0023] When the external gear command is forward gear for forward start, the pressure of the first drive shaft clutch is controlled to gradually engage and transmit torque to achieve first gear start.

[0024] When the external gear command is reverse gear for starting in reverse, the first gear shift fork on the first drive shaft is disengaged and the reverse gear shift fork is engaged. After confirming that the reverse gear shift fork has been engaged, the clutch pressure on the first drive shaft is controlled to gradually engage and transmit torque, so as to achieve starting in reverse gear.

[0025] Optionally, after the gear on the first drive shaft is pre-engaged to reverse and the gear on the second drive shaft is pre-engaged to second gear, the method further includes:

[0026] Get external gear command;

[0027] When the external gear command is forward gear for forward start, the pressure of the second transmission shaft clutch is controlled to gradually engage and transmit torque to achieve second gear start.

[0028] When the external gear command is reverse gear for starting in reverse, the pressure of the first drive shaft clutch is controlled to gradually engage and transmit torque to achieve starting in reverse gear.

[0029] Optionally, when the highest temperature is greater than a second set temperature threshold, the vehicle is controlled to start in first gear; when the highest temperature is less than or equal to the second set temperature threshold, after controlling the vehicle to start in second gear, the method further includes:

[0030] When the vehicle starts in second gear, the highest temperature of the clutch on the second drive shaft is calculated based on the current oil temperature in the transmission and the gradient of the road where the vehicle is located.

[0031] When the highest temperature exceeds the second set temperature threshold, the vehicle is controlled to start in first gear until the vehicle reaches the speed threshold, thus completing the vehicle start control.

[0032] When the highest temperature is less than or equal to the second set temperature threshold, the vehicle is controlled to start in second gear until the vehicle reaches the speed threshold, thus completing the vehicle start control.

[0033] When the vehicle starts in first gear, control the vehicle to continue starting in first gear until the vehicle reaches the speed threshold, thus completing the vehicle start control.

[0034] According to another aspect of the present invention, a dual-clutch transmission vehicle start-up control device is provided, the device comprising: a vehicle body state determination module, a clutch temperature determination module, and a control module;

[0035] The vehicle status determination module is used to determine whether the vehicle is in a hilly parking state when the current oil temperature in the transmission is less than a first set threshold.

[0036] The clutch temperature determination module is used to calculate the highest temperature of the clutch on the second drive shaft in the second gear start state when the vehicle is in an uphill state or a flat road state, based on the current transmission fluid temperature and the slope of the road where the vehicle is located.

[0037] The control module is used to control the vehicle to start in first gear when the highest temperature is greater than the second set temperature threshold; and to control the vehicle to start in second gear when the highest temperature is less than or equal to the second set temperature threshold.

[0038] According to another aspect of the present invention, a computer-readable storage medium is provided, the computer-readable storage medium storing computer instructions for causing a processor to execute and implement the dual-clutch transmission vehicle start-up control method according to any embodiment of the present invention.

[0039] The technical solution provided by this invention detects the current oil temperature inside the transmission. When the current oil temperature is lower than a first preset threshold, it determines whether the vehicle is in a parking state on a slope. When the vehicle is in an uphill or flat road state, it calculates the maximum temperature of the clutch on the second drive shaft in second gear starting state based on the current transmission oil temperature and the slope of the slope. When the maximum temperature is higher than a second preset temperature threshold, it controls the vehicle to start in first gear; when the maximum temperature is less than or equal to the second preset temperature threshold, it controls the vehicle to start in second gear. This technical solution, by monitoring the current operating conditions and selecting the vehicle starting mode based on the oil temperature and the slope of the vehicle, effectively shortens the vehicle starting time in low-temperature conditions and identifies the risk of clutch overheating in advance, making the vehicle starting process faster and more reliable.

[0040] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1This is a flowchart of a dual-clutch transmission vehicle start-up control method provided in Embodiment 1 of the present invention.

[0043] Figure 2 This is a flowchart of a dual-clutch transmission vehicle start-up control method provided in Embodiment 2 of the present invention.

[0044] Figure 3 This is a flowchart of a dual-clutch transmission vehicle start-up control method provided in Embodiment 3 of the present invention.

[0045] Figure 4 This is a flowchart of a dual-clutch transmission vehicle start-up control method provided in Embodiment 4 of the present invention.

[0046] Figure 5 This is a flowchart of a dual-clutch transmission vehicle start-up control method provided in Embodiment 5 of the present invention.

[0047] Figure 6 This is a schematic diagram of a dual-clutch transmission vehicle start-up control device provided in Embodiment Six of the present invention.

[0048] Figure 7 This is a schematic diagram of the electronic device structure of a dual-clutch transmission vehicle start-up control method provided in Embodiment 7 of the present invention. Detailed Implementation

[0049] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0050] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0051] Example 1

[0052] Figure 1 This is a flowchart of a dual-clutch transmission vehicle start-up control method provided in Embodiment 1 of the present invention. This embodiment is applicable to situations where the vehicle start-up time is long in low-temperature conditions and there is a risk of clutch overheating. This method can be executed by a dual-clutch transmission vehicle start-up control device, which can be implemented in hardware and / or software. This dual-clutch transmission vehicle start-up control device can be configured in an electronic device with network communication capabilities. Figure 1 As shown, the method includes:

[0053] S110. When the current oil temperature in the transmission is less than the first set threshold, determine whether the vehicle is in an uphill or flat-slope state.

[0054] The dual-clutch transmission includes a first driveshaft and a second driveshaft. The first driveshaft is used to control odd-numbered gears, and the second driveshaft is used to control even-numbered gears.

[0055] Specifically, upon powering on the vehicle, the system detects the current transmission fluid temperature. If the current transmission fluid temperature exceeds a first preset threshold, the vehicle enters first gear starting mode. If the current transmission fluid temperature is below the first preset threshold, the system determines whether the vehicle is in a hilly parking position. If it is in a downhill position, the vehicle enters first gear starting mode. The first preset threshold can be manually preset to determine whether the vehicle is starting in a low-temperature environment. For example, the first preset threshold is -15°C.

[0056] S120. When the vehicle is on an uphill or flat road, calculate the highest temperature of the clutch on the second drive shaft in the second gear starting state based on the current transmission fluid temperature and the slope of the road where the vehicle is located.

[0057] Specifically, when the current transmission fluid temperature is below a first set threshold, it is determined whether the vehicle is in a hilly parking state. If it is in an uphill or flat state, the maximum temperature of the clutch on the second drive shaft in second gear start-up state is calculated based on the current transmission fluid temperature and the slope of the slope the vehicle is on. The maximum temperature of the clutch on the second drive shaft in second gear start-up state is calculated based on a clutch temperature model, which can be pre-stored. The clutch temperature model is a clutch temperature model relating the current transmission fluid temperature, the slope of the slope the vehicle is on, and the maximum temperature of the clutch on the second drive shaft in second gear start-up state. After determining the current transmission fluid temperature and the slope of the slope the vehicle is on, substituting them into the clutch temperature model yields the maximum temperature of the clutch on the second drive shaft in second gear start-up state, based on the current transmission fluid temperature and the slope of the slope the vehicle is on.

[0058] S130. When the highest temperature exceeds the second set temperature threshold, control the vehicle to start in first gear.

[0059] S140. When the highest temperature is less than or equal to the second set temperature threshold, control the vehicle to start in second gear.

[0060] The second set temperature threshold can be preset manually. Specifically, the second set temperature threshold is a value obtained by combining the torque magnitude, cooling oil temperature, cooling oil flow rate, current speed of the two clutch friction plates and speed difference through multiple tests.

[0061] Specifically, calculating the highest temperature of the clutch on the second drive shaft during second-gear start-up aims to determine if there is a risk of overheating in the clutch. When the highest temperature exceeds the second set temperature threshold, it indicates that the clutch is at risk of overheating. Furthermore, the viscosity of the clutch fluid is directly related to temperature. When the temperature is higher, the viscosity of the clutch fluid is lower, so the vehicle is controlled to start in first gear. When the highest temperature is less than or equal to the second set temperature threshold, it indicates that the clutch is not at risk of overheating. Furthermore, when the temperature is lower, the viscosity of the clutch fluid is higher, so the vehicle is controlled to start in second gear when the vehicle is at a low temperature and not overheating.

[0062] The technical solution provided by this invention detects the current oil temperature inside the transmission. When the current oil temperature is lower than a first preset threshold, it determines whether the vehicle is in a parking state on a slope. When the vehicle is in an uphill or flat road state, it calculates the maximum temperature of the clutch on the second drive shaft in second gear starting state based on the current transmission oil temperature and the slope of the slope. When the maximum temperature is higher than a second preset temperature threshold, it controls the vehicle to start in first gear; when the maximum temperature is less than or equal to the second preset temperature threshold, it controls the vehicle to start in second gear. This technical solution, by monitoring the current operating conditions and selecting the vehicle starting mode based on the oil temperature and the slope of the vehicle, effectively shortens the vehicle starting time in low-temperature conditions and identifies the risk of clutch overheating in advance, making the vehicle starting process faster and more reliable.

[0063] Example 2

[0064] Figure 2 This is a flowchart of a dual-clutch transmission vehicle start-up control method provided in Embodiment 2 of the present invention. The present invention further refines the aforementioned embodiments based on the above embodiments, such as... Figure 2 As shown, the method includes:

[0065] S210. Determine whether the current transmission fluid temperature is lower than the first set threshold.

[0066] If the current transmission fluid temperature is lower than the first set threshold, then execute S220; if the current transmission fluid temperature is greater than or equal to the first set threshold, then execute S230.

[0067] S220: Determine whether the vehicle is on an uphill or flat slope; if the vehicle is on a downhill slope, execute S230.

[0068] S230, control the vehicle to start in first gear.

[0069] S240. When the vehicle is on an uphill or flat road, calculate the highest temperature of the clutch on the second drive shaft in the second gear starting state based on the current transmission fluid temperature and the slope of the road where the vehicle is located.

[0070] S250. Determine whether the highest temperature is greater than the second set temperature threshold; if yes, execute S230; if no, execute S260.

[0071] S260, control the vehicle to start in second gear.

[0072] The technical solution provided by this invention quickly determines whether the vehicle is in a low-temperature state when starting by using the current transmission fluid temperature, and then selects different starting modes. Based on the slope of the road where the vehicle is located and the current transmission fluid temperature, it finally judges whether there is a risk of clutch overheating. When the vehicle is in a low-temperature state but not overheating, the second-gear starting mode is executed, which further effectively shortens the vehicle starting time under low-temperature conditions and avoids clutch overheating, making the vehicle starting process faster and more reliable.

[0073] Example 3

[0074] Figure 3 This is a flowchart of a dual-clutch transmission vehicle start-up control method provided in Embodiment 3 of the present invention, as shown below. Figure 3 As shown, the method includes:

[0075] S310. Determine whether the current transmission fluid temperature is lower than the first set threshold.

[0076] If the current transmission fluid temperature is lower than the first set threshold, then execute S320; if the current transmission fluid temperature is greater than or equal to the first set threshold, then execute S330.

[0077] S320: Determine whether the vehicle is on an uphill or flat slope; if the vehicle is on a downhill slope, execute S330.

[0078] S330, Control the gear on the first drive shaft to be engaged in first gear and the gear on the second drive shaft to be engaged in second gear.

[0079] S340. When the vehicle is on an uphill or flat road, calculate the highest temperature of the clutch on the second drive shaft in the second gear starting state based on the current transmission fluid temperature and the slope of the road where the vehicle is located.

[0080] S350: Determine whether the highest temperature is greater than the second set temperature threshold; if yes, execute S330; if no, execute S360.

[0081] S360, Control the gear on the first drive shaft to reverse and the gear on the second drive shaft to second gear.

[0082] In vehicles with dual-clutch automatic transmissions, the shift fork controlling reverse gear and the shift fork controlling first gear are on the same control shaft.

[0083] After S330, execute S331.

[0084] S331. Obtain external gear command and determine whether the external gear command is a forward gear;

[0085] When the external gear command is forward gear for forward start, S332 is executed; when the external gear command is reverse gear for reverse start, S333 is executed.

[0086] S332. Control the pressure of the first drive shaft clutch to gradually engage and transmit torque, so as to achieve first gear start.

[0087] S333: Disengage the first gear shift fork on the first drive shaft and engage the reverse gear shift fork. After confirming that the reverse gear shift fork has been engaged, control the clutch pressure on the first drive shaft to gradually engage and transmit torque to achieve reverse gear start.

[0088] After S360, execute S370.

[0089] S370: Obtain external gear command and determine whether the external gear command is a forward gear;

[0090] When the external gear command is forward gear for forward start, execute S380; when the external gear command is reverse gear for reverse start, execute S390.

[0091] S380: Control the pressure of the second drive shaft clutch to gradually engage and transmit torque, so as to achieve second gear start.

[0092] S390: Control the pressure of the first drive shaft clutch to gradually engage and transmit torque, so as to achieve reverse gear start.

[0093] The technical solution provided in this invention pre-controls the gear positions on the two drive shafts of the transmission through different starting modes. Specifically, after the engine is started and before the driver initiates a starting action, the corresponding shift forks are pre-controlled to engage the gear positions on the two drive shafts. If a first-gear starting mode is used, the gears on the first and second drive shafts should be pre-engaged as first and second gear, respectively. If a second-gear starting mode is used, the gears on the first and second drive shafts should be pre-engaged as reverse (R) and second gear, respectively. After the gear pre-engagement is completed, the system waits for the driver's gear command to determine the subsequent starting process. If a first-gear starting mode is used, and the driver engages a forward gear to start forward, the first drive shaft is controlled... The clutch pressure gradually engages and transmits torque, enabling first-gear start. In first-gear start mode, when the driver engages reverse gear, the first-gear shift fork on the first drive shaft is disengaged and the reverse shift fork is engaged. Once the reverse shift fork is engaged, the clutch pressure on the first drive shaft is gradually engaged and transmits torque, enabling reverse start. In second-gear start mode, when the driver engages forward gear, the clutch pressure on the second drive shaft is gradually engaged and transmits torque, enabling second-gear start. In second-gear start mode, when the driver engages reverse gear, the clutch pressure on the first drive shaft is gradually engaged and transmits torque, enabling reverse start. The technical solution provided by this invention allows for rapid engagement of the shift forks when the vehicle is first started, before the transmission shaft gears have been cooled and lubricated. This prevents the shift forks from failing to engage gears smoothly. When it is determined that second gear is required for starting, the shift forks on the first and second transmission shafts are engaged in reverse and second gear. When it is determined that first gear is required for starting, the shift forks on the first and second transmission shafts are engaged in first and second gear. This avoids the vehicle failing to start due to the low temperature causing the shift forks to be difficult to engage when the driver is reversing, further shortening the vehicle starting time and making the vehicle starting process faster and more reliable.

[0094] Example 4

[0095] Figure 4 This is a flowchart of a dual-clutch transmission vehicle start-up control method provided in Embodiment 4 of the present invention, as shown below. Figure 4 As shown, the method includes:

[0096] S410. Determine whether the current transmission fluid temperature is lower than the first set threshold.

[0097] If the current transmission fluid temperature is lower than the first set threshold, then execute S420; if the current transmission fluid temperature is greater than or equal to the first set threshold, then execute S430.

[0098] S420: Determine whether the vehicle is on an uphill or flat slope; if the vehicle is on a downhill slope, execute S430.

[0099] S430, control the vehicle to start in first gear.

[0100] S440. When the vehicle is on an uphill or flat road, calculate the highest temperature of the clutch on the second drive shaft in the second gear starting state based on the current transmission fluid temperature and the slope of the road where the vehicle is located.

[0101] S450: Determine whether the highest temperature is greater than the second set temperature threshold; if yes, execute S430; if no, execute S460.

[0102] S460, control the vehicle to start in second gear.

[0103] S470. When the vehicle starts in second gear, calculate the maximum temperature of the clutch on the second drive shaft in the second gear starting state based on the current transmission fluid temperature and the slope of the road where the vehicle is located.

[0104] S480: Determine whether the highest temperature is greater than the second set temperature threshold.

[0105] When the highest temperature is greater than the second set temperature threshold, execute S490; when the highest temperature is less than or equal to the second set temperature threshold, execute S491.

[0106] S490: Control the vehicle to start in first gear until the vehicle reaches the speed threshold, thus completing the vehicle start control.

[0107] S491. Control the vehicle to start in second gear until the vehicle reaches the speed threshold, and complete the vehicle start control.

[0108] S492. When the vehicle starts in first gear, control the vehicle to continue starting in first gear until the vehicle reaches the speed threshold, thus completing the vehicle start control.

[0109] The technical solution provided in this embodiment of the invention states that if the vehicle uses a first-gear start mode, the first-gear start mode is maintained until the vehicle reaches the speed threshold, thus completing vehicle start control. If the vehicle uses a second-gear start mode and is starting in the forward direction, the maximum temperature of the clutch on the second drive shaft in the second-gear start state needs to be calculated based on the current transmission fluid temperature and the slope of the road where the vehicle is located. Further assessment is needed to determine if there is a risk of overheating in the clutch. If there is a risk of overheating, the gear on the first drive shaft is controlled to disengage reverse gear, engage first gear, and then downshift to first gear. If this downshifting operation has been performed, second-gear start will not be performed again in the current power-on cycle. If the vehicle uses a second-gear start mode and is starting in reverse gear, or if there is no risk of overheating in the clutch on the second drive shaft, the second-gear start mode is maintained until the vehicle reaches the speed threshold, thus completing vehicle start control.

[0110] Example 5

[0111] Figure 5 This is a flowchart of a dual-clutch transmission vehicle start-up control method provided in Embodiment 5 of the present invention, as shown below. Figure 5 As shown, the method includes:

[0112] S510. Determine whether the current transmission fluid temperature is lower than the first set threshold.

[0113] If the current transmission fluid temperature is lower than the first set threshold, then execute S511; if the current transmission fluid temperature is greater than or equal to the first set threshold, then execute S512.

[0114] S511. Determine whether the vehicle is on an uphill or flat slope; if the vehicle is on a downhill slope, execute S512; if the vehicle is on an uphill or flat slope, execute S513.

[0115] S512, control the gear on the first drive shaft to be engaged in first gear and the gear on the second drive shaft to be engaged in second gear.

[0116] S513. When the vehicle is on an uphill or flat road, calculate the highest temperature of the clutch on the second drive shaft in the second gear starting state based on the current transmission fluid temperature and the slope of the road where the vehicle is located.

[0117] S514. Determine whether the highest temperature is greater than the second set temperature threshold; if yes, execute S512; if no, execute S515.

[0118] S515, Control the gear on the first drive shaft to reverse and the gear on the second drive shaft to second gear.

[0119] After S512, execute S519; after S515, execute S516.

[0120] S516. Obtain external gear command and determine whether the external gear command is a forward gear.

[0121] When the external gear command is forward gear for forward start, execute S517; when the external gear command is reverse gear for reverse start, execute S518.

[0122] S517: Control the pressure of the second drive shaft clutch to gradually engage and transmit torque, so as to achieve second gear start.

[0123] S518: Control the pressure of the first drive shaft clutch to gradually engage and transmit torque, so as to achieve reverse gear start.

[0124] S519. Obtain external gear command and determine whether the external gear command is a forward gear;

[0125] When the external gear command is forward gear for forward start, S520 is executed; when the external gear command is reverse gear for reverse start, S521 is executed.

[0126] S520 controls the pressure of the first drive shaft clutch to gradually engage and transmit torque, thereby enabling first-gear start-up.

[0127] S521, control the first gear shift fork on the first drive shaft to disengage and the reverse gear shift fork to engage. After confirming that the reverse gear shift fork has been engaged, control the clutch pressure on the first drive shaft to gradually engage and transmit torque to achieve reverse gear start.

[0128] After S517, execute S523; after S520, execute S522.

[0129] S522. When the vehicle starts in first gear, control the vehicle to continue starting in first gear until the vehicle reaches the speed threshold, thus completing the vehicle start control.

[0130] S523. When the vehicle starts in second gear, calculate the maximum temperature of the clutch on the second drive shaft in the second gear starting state based on the current transmission fluid temperature and the slope of the road where the vehicle is located.

[0131] S524. Determine whether the highest temperature is greater than the second set temperature threshold.

[0132] When the highest temperature is greater than the second set temperature threshold, execute S525; when the highest temperature is less than or equal to the second set temperature threshold, execute S526.

[0133] S525: Control the vehicle to start in first gear until the vehicle reaches the speed threshold, thus completing the vehicle start control.

[0134] S526. Control the vehicle to start in second gear until the vehicle reaches the speed threshold, and complete the vehicle start control.

[0135] The technical solution provided by this invention determines whether the current oil temperature inside the transmission is lower than a first preset threshold. When the current oil temperature inside the transmission is lower than the first preset threshold, it determines whether the vehicle is in an uphill or flat-slope state. When the vehicle is in an uphill or flat-slope state, it calculates the maximum temperature of the clutch on the second drive shaft in second-gear start-up mode based on the current oil temperature inside the transmission and the slope of the slope where the vehicle is located. When the maximum temperature is higher than a second preset temperature threshold, it controls the vehicle to start in first gear; when the maximum temperature is less than or equal to the second preset temperature threshold, it controls the vehicle to start in second gear. This technical solution, by monitoring the current operating conditions and selecting the vehicle start-up mode based on the oil temperature and the slope of the vehicle, effectively shortens the vehicle start-up time in low-temperature conditions and identifies the risk of clutch overheating in advance, making the vehicle start-up process faster and more reliable.

[0136] Example 6

[0137] Figure 6 This is a schematic diagram of the structure of a dual-clutch transmission vehicle start-up control device provided in Embodiment 5 of the present invention, as shown below. Figure 6 As shown, the device includes: a vehicle body status determination module 610, a clutch temperature determination module 620, and a control module 630;

[0138] The vehicle status determination module 610 is used to determine whether the vehicle is in a hill-start parking state when the current oil temperature in the transmission is less than a first set threshold.

[0139] The clutch temperature determination module 620 is used to calculate the highest temperature of the clutch on the second drive shaft in the second gear start state when the vehicle is in an uphill state or on a flat road state, based on the current transmission fluid temperature and the slope of the road where the vehicle is located.

[0140] The control module 630 is used to control the vehicle to start in first gear when the maximum temperature is greater than the second set temperature threshold; and to control the vehicle to start in second gear when the maximum temperature is less than or equal to the second set temperature threshold.

[0141] The distributed power supply access scale determination device provided in the embodiments of the present invention can execute the distributed power supply access scale determination method provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of executing the method.

[0142] Example 7

[0143] Figure 7 This is a schematic diagram of an electronic device structure for a dual-clutch transmission vehicle start-up control method provided in Embodiment Six of the present invention. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, wearable devices (e.g., helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the invention described and / or claimed herein.

[0144] like Figure 7As shown, the electronic device 10 includes at least one processor 11 and a memory, such as a read-only memory (ROM) 12 or a random access memory (RAM) 13, communicatively connected to the at least one processor 11. The memory stores computer programs executable by the at least one processor. The processor 11 can perform various appropriate actions and processes based on the computer program stored in the ROM 12 or loaded from storage unit 18 into the RAM 13. The RAM 13 may also store various programs and data required for the operation of the electronic device 10. The processor 11, ROM 12, and RAM 13 are interconnected via a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0145] Multiple components in electronic device 10 are connected to I / O interface 15, including: input unit 16, such as keyboard, mouse, etc.; output unit 17, such as various types of displays, speakers, etc.; storage unit 18, such as disk, optical disk, etc.; and communication unit 19, such as network card, modem, wireless transceiver, etc. Communication unit 19 allows electronic device 10 to exchange information / data with other devices through computer networks such as the Internet and / or various telecommunications networks.

[0146] Processor 11 can be a variety of general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. Processor 11 performs the various methods and processes described above, such as a dual-clutch transmission vehicle start-up control method.

[0147] In some embodiments, a dual-clutch transmission vehicle launch control method may be implemented as a computer program tangibly contained in a computer-readable storage medium, such as storage unit 18. In some embodiments, part or all of the computer program may be loaded and / or installed on electronic device 10 via ROM 12 and / or communication unit 19. When the computer program is loaded into RAM 13 and executed by processor 11, one or more steps of the dual-clutch transmission vehicle launch control method described above may be performed. Alternatively, in other embodiments, processor 11 may be configured to perform the dual-clutch transmission vehicle launch control method by any other suitable means (e.g., by means of firmware).

[0148] Various embodiments of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), systems-on-a-chip (SoCs), payload-programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include implementations in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor, capable of receiving data and instructions from a storage system, at least one input device, and at least one output device, and transmitting data and instructions to the storage system, the at least one input device, and the at least one output device.

[0149] Computer programs used to implement the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when executed by the processor, the computer programs cause the functions / operations specified in the flowcharts and / or block diagrams to be performed. The computer programs may be executed entirely on a machine, partially on a machine, or as a standalone software package, partially on a machine and partially on a remote machine, or entirely on a remote machine or server.

[0150] In the context of this invention, a computer-readable storage medium can be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, apparatus, or device. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination thereof. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0151] To provide interaction with a user, the systems and techniques described herein can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user provides input to the electronic device. Other types of devices can also be used to provide interaction with the user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including sound input, voice input, or tactile input).

[0152] The systems and technologies described herein can be implemented in computing systems that include backend components (e.g., as data servers), or computing systems that include middleware components (e.g., application servers), or computing systems that include frontend components (e.g., user computers with graphical user interfaces or web browsers through which users can interact with implementations of the systems and technologies described herein), or any combination of such backend, middleware, or frontend components. The components of the system can be interconnected via digital data communication of any form or medium (e.g., communication networks). Examples of communication networks include local area networks (LANs), wide area networks (WANs), blockchain networks, and the Internet.

[0153] A computing system can include clients and servers. Clients and servers are generally located far apart and typically interact through communication networks. The client-server relationship is created by computer programs running on the respective computers and having a client-server relationship with each other. The server can be a cloud server, also known as a cloud computing server or cloud host, which is a hosting product within the cloud computing service system to address the shortcomings of traditional physical hosts and VPS services, such as high management difficulty and weak business scalability.

[0154] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0155] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A method for starting control of a vehicle with a dual-clutch transmission, characterized in that, The dual-clutch transmission includes a first driveshaft and a second driveshaft, wherein the first driveshaft is used to control odd-numbered gears, and the second driveshaft is used to control even-numbered gears; the vehicle start-up control method of the dual-clutch transmission includes: When the current oil temperature in the transmission is lower than the first set threshold, determine whether the vehicle is in an uphill or flat-slope state. When the vehicle is in an uphill or flat road condition, the highest temperature of the clutch on the second drive shaft in the second gear start state is calculated based on the current transmission fluid temperature and the slope of the slope where the vehicle is located. The calculation of the highest temperature of the clutch on the second drive shaft in the second gear start state is performed based on a pre-stored clutch temperature model. The clutch temperature model is a clutch temperature model with respect to the current transmission fluid temperature, the slope of the slope where the vehicle is located, and the highest temperature of the clutch on the second drive shaft in the second gear start state. When the highest temperature exceeds the second set temperature threshold, the vehicle is controlled to start in first gear. When the highest temperature is less than or equal to the second set temperature threshold, the vehicle is controlled to start in second gear.

2. The method according to claim 1, characterized in that, Before the current oil temperature in the transmission is lower than a first set threshold, the following steps are also included: Determine whether the current transmission fluid temperature is lower than the first set threshold. If the current transmission fluid temperature is lower than the first set threshold, then determine whether the vehicle is in a hilly parking state. If the current transmission fluid temperature is greater than or equal to the first set threshold, then the vehicle is controlled to start in first gear.

3. The method according to claim 1, characterized in that, After determining whether the vehicle is parked on a slope, the following steps are also included: When the vehicle is going downhill, control the vehicle to start in first gear.

4. The method according to claim 1, characterized in that, When the highest temperature exceeds a second preset temperature threshold, controlling the vehicle to start in first gear includes: The gear on the first drive shaft is set to first gear and the gear on the second drive shaft is set to second gear.

5. The method according to claim 1, characterized in that, When the highest temperature is less than or equal to a second set temperature threshold, controlling the vehicle to start in second gear includes: The gear on the first drive shaft is set to reverse, and the gear on the second drive shaft is set to second gear.

6. The method according to claim 4, characterized in that, After the gear on the first drive shaft is pre-engaged to first gear and the gear on the second drive shaft is pre-engaged to second gear, the process further includes: Get external gear command; When the external gear command is to start in forward gear, the pressure of the first drive shaft clutch is controlled to gradually engage and transmit torque, so as to achieve starting in first gear. When the external gear command is reverse gear for starting in reverse, the first gear shift fork on the first drive shaft is disengaged and the reverse gear shift fork is engaged. After confirming that the reverse gear shift fork has been engaged, the clutch pressure on the first drive shaft is controlled to gradually engage and transmit torque, so as to achieve starting in reverse gear.

7. The method according to claim 5, characterized in that, After the gear on the first drive shaft is pre-engaged to reverse and the gear on the second drive shaft is pre-engaged to second gear, the process further includes: Get external gear command; When the external gear command is forward gear for forward start, the pressure of the second transmission shaft clutch is controlled to gradually engage and transmit torque to achieve second gear start; When the external gear command is reverse gear for starting in reverse, the pressure of the first drive shaft clutch is controlled to gradually engage and transmit torque to achieve starting in reverse gear.

8. The method according to claim 1, characterized in that, When the highest temperature is greater than a second set temperature threshold, the vehicle is controlled to start in first gear; when the highest temperature is less than or equal to the second set temperature threshold, after controlling the vehicle to start in second gear, the method further includes: When the vehicle starts in second gear, the highest temperature of the clutch on the second drive shaft is calculated based on the current oil temperature in the transmission and the gradient of the road where the vehicle is located. When the highest temperature exceeds the second set temperature threshold, the vehicle is controlled to start in first gear until the vehicle reaches the speed threshold, thus completing the vehicle start control. When the highest temperature is less than or equal to the second set temperature threshold, the vehicle is controlled to start in second gear until the vehicle reaches the speed threshold, thus completing the vehicle start control. When the vehicle starts in first gear, control the vehicle to continue starting in first gear until the vehicle reaches the speed threshold, thus completing the vehicle start control.

9. A vehicle start-up control device for a dual-clutch transmission, characterized in that, The device includes: a vehicle body status determination module, a clutch temperature determination module, and a control module; The vehicle status determination module is used to determine whether the vehicle is in a hilly parking state when the current oil temperature in the transmission is less than a first set threshold. The clutch temperature determination module is used to calculate the maximum temperature of the clutch on the second drive shaft in the second gear start state when the vehicle is in an uphill state or a flat road state, based on the current transmission fluid temperature and the slope of the slope where the vehicle is located. The calculation of the maximum temperature of the clutch on the second drive shaft in the second gear start state is performed based on a pre-stored clutch temperature model. The clutch temperature model is a clutch temperature model with respect to the current transmission fluid temperature, the slope of the slope where the vehicle is located, and the maximum temperature of the clutch on the second drive shaft in the second gear start state. The control module is used to control the vehicle to start in first gear when the highest temperature is greater than the second set temperature threshold; and to control the vehicle to start in second gear when the highest temperature is less than or equal to the second set temperature threshold.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that cause a processor to execute the dual-clutch transmission vehicle start-up control method according to any one of claims 1-8.

Images