[0068]Example one
[0069]figure 2 This is a schematic flow diagram of the gear processing method provided by the embodiments of the present disclosure, such asfigure 2 As shown, the gear processing method provided by the embodiment of the present disclosure includes:
[0070]Step 101: Obtain a gear adjustment request triggered by a user.
[0071]It should be noted that the execution body of the gear processing method provided in this embodiment is the aforementioned gear processing device, which is mounted in the server of the automatic transmission control unit.
[0072]In this embodiment, when the user is driving the target vehicle uphill, the user will trigger the gear adjustment request according to demand. Specifically, the gear adjustment request may include an accelerator pedal.
[0073]Step 102: Obtain operating data of the engine of the target vehicle according to the gear adjustment request, where the operating data includes current speed information and actual torque percentage of the engine.
[0074]In this embodiment, after the gear processing device obtains the gear adjustment request triggered by the user, in order to prevent the target vehicle from returning to neutral due to improper gear shift timing during the climbing process, the entire vehicle will slip. It is necessary to determine whether the engine has enough torque margin for upshifting before shifting. Therefore, in order to determine that the engine has sufficient torque margin, the gear processing device may first obtain operating data of the target vehicle engine. Specifically, the operating data may include the current engine speed information and the actual torque percentage.
[0075]Step 103: Calculate the torque margin corresponding to the engine according to the operating data.
[0076]In this embodiment, since the engine is specifically used to provide power for the target vehicle, the calculation of the target vehicle engine torque margin can be realized according to the operating data of the target vehicle engine, and the torque margin is specifically used to determine whether the target vehicle can be Upshift. Specifically, after the gear processing device obtains the operating data of the target vehicle engine, it may calculate the torque margin according to the current engine speed information and the actual torque percentage.
[0077]Step 104: Process the gear adjustment request according to the torque margin.
[0078]In this embodiment, after the gear processing device calculates the torque margin corresponding to the engine, in order to ensure that the engine speed will not be pulled down during the gear shifting process, causing the transmission to return to neutral, the gear processing device will The gear adjustment request is processed according to the torque margin. Specifically, if the torque margin can meet the upshift demand, the gear processing device will perform an upshift process. If the torque margin cannot meet the upshift demand, the gear processing device will not process the gear adjustment request. The target vehicle will keep the current gear and continue driving.
[0079]For example, when a hydraulic-mechanical continuously variable transmission vehicle is climbing a hill, the driver feels that the vehicle's power is insufficient at this time, so he stepped on the accelerator pedal. At this time, the gear processing device obtains the gear adjustment request triggered by the driver, and then retrieves the operating data of the vehicle engine, and calculates the torque margin corresponding to the engine according to the current engine speed information and the actual torque percentage in the operating data. Next, the gear processing device will judge the size of the torque margin. If the torque margin can meet the upshift demand, it will automatically control the vehicle to upshift. If the torque margin cannot meet the upshift demand , Control the vehicle to keep the current gear and continue driving.
[0080]The gear processing method provided in this embodiment obtains a gear adjustment request triggered by a user, and obtains operating data of the target vehicle engine according to the gear adjustment request, and calculates the torque margin corresponding to the engine based on the operating data. The margin handles the gear adjustment request. It not only ensures that the engine speed will not be pulled down during the gear shifting process, but also avoids the situation that the gearbox returns to neutral and causes the vehicle to slip. Moreover, by adopting this method of reasonably upshifting according to the torque margin, the wear of the clutch is avoided and the service life of the clutch is prolonged.
[0081]On the basis of the first embodiment above, in order to further explain the gear processing method of the present disclosure, in the above embodiment 1, step 103 specifically includes: calculating the engine according to the current speed information of the engine and the preset external characteristic curve The corresponding maximum torque at the current speed; the actual torque corresponding to the engine is calculated according to the actual torque percentage corresponding to the engine and the preset reference torque; the actual torque corresponding to the engine is calculated according to the maximum torque, the actual torque and the preset transmission efficiency The torque margin corresponding to the engine.
[0082]In this embodiment, in order to accurately calculate the torque margin corresponding to the engine, the gear processing device first calculates the maximum torque corresponding to the engine at the current speed according to the current engine speed information and the preset external characteristic curve. Specifically, the external engine characteristic curve is the curve of the engine torque changing with the speed when the accelerator pedal is fully depressed. Therefore, in the external characteristic curve, the torque corresponding to the current engine speed is the maximum torque A.
[0083]After the gear processing device calculates the maximum torque of the engine, it also needs to calculate the actual torque B corresponding to the engine. Specifically, the gear processing device obtains the actual torque percentage p corresponding to the engine and the preset reference torque through the electronic control unit to calculate the actual torque B corresponding to the engine. Correspondingly, the actual torque corresponding to the engine is the product of the actual torque percentage p and the preset reference torque.
[0084]For example, if the actual torque percentage p corresponding to the engine is 80%, and the preset reference torque is 200N·m, the actual torque B corresponding to the engine is 200N·m*80%, that is, 160N·m.
[0085]Finally, in order to make the calculated torque margin fit the actual situation of the target vehicle, the gear processing device also obtains the vehicle's preset transmission efficiency k1, And according to the maximum torque A, actual torque B and transmission efficiency k1Calculate the torque margin corresponding to the engine. Specifically, the torque margin is the difference between the maximum torque and the actual torque divided by the transmission efficiency, namely (A-B)/k1.
[0086]Continuing the above example, if the maximum torque A corresponding to the engine at the current speed is 300N·m, the actual torque B corresponding to the engine is 160N·m, and the transmission efficiency is k1If it is 70%, the torque margin corresponding to the engine is (300N·m-160N·m)/70%, that is, 200N·m.
[0087]Through the above method, the torque margin is accurately determined, so that the calculated torque margin can fit the actual situation of the target vehicle, so that the gear adjustment request can be accurately processed to prevent the gearbox from returning to neutral.
[0088]Further, on the basis of Embodiment 1, before calculating the maximum torque corresponding to the engine at the current speed according to the current engine speed information and a preset external characteristic curve, the method further includes: according to the gear position The adjustment request is to obtain the message information sent by the engine of the target vehicle; and the preset external characteristic curve is extracted from the message information.
[0089]In this embodiment, after the gear processing device obtains the user-triggered gear adjustment request, it needs to calculate the engine torque margin according to the maximum torque corresponding to the engine at the current speed, so as to make corresponding processing. Therefore, in order to Calculating the maximum torque corresponding to the engine at the current speed, the gear processing device can first obtain the message information sent by the target vehicle engine, and extract the preset external characteristic curve from the message information. Specifically, the message information may include the corresponding relationship between the engine speed and the maximum torque.
[0090]Through the above method, the preset external characteristic curve of the target vehicle can be obtained, and then the maximum torque corresponding to the engine at the current speed can be obtained, which lays the foundation for calculating the torque margin of the engine.
[0091]Further, on the basis of the first embodiment above, the operating data of the engine also includes engine load characteristics.image 3 This is a schematic flow chart of the gear processing method provided by the embodiments of the present disclosure, such asimage 3 As shown, in the foregoing embodiment 1, step 104 specifically includes:
[0092]Step 1041 Calculate the gear shift required torque corresponding to the engine according to the engine load characteristic and the preset reference torque.
[0093]Step 1042. Acquire acceleration information of the target vehicle, and calculate an upshift threshold based on the gear shift demand torque, the acceleration information, and a preset acceleration torque coefficient.
[0094]Step 1043: Determine whether the torque margin is greater than or equal to the upshift threshold.
[0095]Step 1044: If yes, perform a gear adjustment operation according to the gear adjustment request.
[0096]Step 1045: If not, do not process the gear adjustment request.
[0097]In this embodiment, in order to correctly process the gear adjustment request triggered by the user based on the actual situation, the gear processing device first needs to calculate the gear shift required torque C corresponding to the engine according to the engine load characteristics and the preset reference torque. Specifically, the engine load characteristics may include load changes caused by controlling the swing angle of the pump during a gear shift. Correspondingly, the gear shift required torque C corresponding to the engine is the product of the load change caused by the swing angle of the control pump during the gear shift and the preset reference torque.
[0098]Next, in order to make the processing result of the gear adjustment request more suitable for the actual situation, the gear processing device will obtain the acceleration information of the target vehicle, and according to the gear shift demand torque, acceleration information a and the preset acceleration torque coefficient k2Calculate the upshift threshold. Specifically, the upshift threshold is the product of the acceleration of the target vehicle and the preset acceleration-to-torque coefficient plus the shift demand torque, ie C+a*k2.
[0099]Finally, in order to ensure that the engine has sufficient torque margin for upshifting and avoid the situation that the transmission returns to neutral, the gear processing device needs to determine whether the torque margin is greater than or equal to the upshift threshold. Specifically, if the torque margin is greater than or equal to the upshift threshold, that is (A-B)/k1≥C+a*k2, It means that the engine has enough torque margin for upshifting, and the gear processing device will perform the gear adjustment operation according to the gear adjustment request, that is, perform upshift processing. If the torque margin is less than the upshift threshold, that is (AB )/k1 2, Means that the engine does not have enough torque margin for upshifting, and the gear processing device does not process the gear adjustment request, that is, keep the current gear.
[0100]Through the above method, it is accurately judged whether the engine has enough torque margin for upshifting, and combined with the actual situation, the gear adjustment request is appropriately processed according to the judgment result, effectively avoiding the situation of the gearbox returning to neutral. .
[0101]Further, on the basis of the foregoing embodiment 1, the determining whether the torque margin is greater than or equal to the upshift threshold includes: determining whether the torque margin is greater than or equal to the upshift within a preset time interval. Gear threshold.
[0102]In this embodiment, in order to ensure that the torque margin of the engine is not only to meet the upshift demand instantaneously, it is necessary to ensure that the torque margin of the engine is sufficient for the upshift within a period of time. Specifically, the gear processing device may determine whether the torque margin is greater than or equal to the upshift threshold within a preset time interval.
[0103]Through the above method, the accuracy of the judgment of the torque margin of the engine is ensured, and the situation that the processing of the gear adjustment request is unreasonable due to the inaccurate judgment of the torque margin is avoided.
[0104]Further, on the basis of the above-mentioned embodiment 1, the obtaining the gear adjustment request triggered by the user includes: when it is detected that the adjustment range of the accelerator pedal by the user is greater than a preset range threshold, determining that the gear is currently obtained Bit adjustment request.
[0105]In this embodiment, the gear processing device obtains the gear adjustment request triggered by the user. Specifically, when the gear processing device detects that the adjustment range of the accelerator pedal by the user is greater than the preset amplitude threshold, it is determined that the gear adjustment request is currently acquired.
[0106]The gear processing method provided in this embodiment obtains a gear adjustment request triggered by a user, and obtains operating data of the target vehicle engine according to the gear adjustment request, and calculates the torque margin corresponding to the engine based on the operating data. The margin handles the gear adjustment request. Before shifting gears, judge whether the engine has enough torque margin for upshifting, so as to ensure that the engine speed will not be pulled down during the shifting process, and avoid the gearbox returning to neutral, which will cause the whole vehicle to slip or even appear. Dangerous situations such as a car crash. In addition, by adopting this method of upshifting according to the torque margin, the wear of the clutch is avoided and the service life of the clutch is prolonged.
