A method and apparatus for controlling an automatic transmission shift schedule

Abstract

The application provides an automatic gearbox shift program control method and device, and relates to the technical field of automatic gearbox program control, and aims to solve the technical problem that the fuel economy is poor when a vehicle runs on a road with a large change in altitude and a large change in altitude variance under the same economic mode shift program, the method comprising the following steps: dividing vehicle road altitude by gear in advance, and creating a gearbox shift program for vehicle road altitude information of each gear. Calculating road altitude information during vehicle running, and determining a road altitude gear according to the altitude information. Obtaining a target gearbox shift program corresponding to the determined road altitude gear, and calibrating the gearbox by using the target gearbox shift program. The method can adapt to different terrains and altitudes, automatically control the gearbox shift speed, avoid the demand torque change caused by terrain change from deviating the economic working condition interval, and improve the economy of the vehicle.

Description

Technical Field

[0001] This application relates to the field of automatic transmission program control technology, and in particular to an automatic transmission shift program control method and device. Background Technology

[0002] The transmission is a core component of a normal power control system, and different transmission control programs determine the differences in vehicle power and fuel economy. Typically, trucks are calibrated with two transmission programs at the factory: an economy mode and a power mode. Changing the program requires manual switching by the driver. This approach has two shortcomings: first, it cannot automatically switch modes, and drivers often forget to change the transmission mode when encountering varying altitudes, as different road conditions require different transmission modes; second, this system only offers two transmission program options—economy mode and power mode—without further refining the economy mode to suit different terrain conditions.

[0003] Traditional economic model programs are only applicable to certain specific slope conditions. When encountering varying altitude conditions with large variations in altitude variance, this single program cannot adapt to multiple road conditions. For example, when a driver sets the initial economy mode program to suit hilly road conditions, when the vehicle travels to mountainous terrain, the shift points set by the hilly mode program will be too low for mountainous conditions because the torque required on mountains is greater than on hills. This results in a high gear, low RPM, and high torque engine operating condition. According to the universal characteristic graph, the operating point in this case is in the upper left corner, deviating from the engine's economic operating range. Conversely, when the vehicle travels to flat terrain, the torque required on flat terrain is less than on hills. This results in a low gear, high RPM, and low torque engine operating condition. According to the universal characteristic graph, the operating point in this case is in the lower right corner, deviating from the engine's economic operating range. Therefore, using only one economy mode to handle flat, hilly, and mountainous road conditions cannot keep the engine in the economic operating range at all times, resulting in poor fuel economy. Summary of the Invention

[0004] This application provides an automatic transmission shift program control method and device to solve the technical problem that using the same economic mode shift program results in poor fuel economy when the vehicle is driving on road conditions with varying altitudes and large altitude variances.

[0005] On one hand, this application provides an automatic transmission shift program control method, the method comprising the following steps:

[0006] Step S1: Pre-classify the vehicle's road condition elevation according to gear, and create a gearbox shifting program for each gear's road condition elevation information.

[0007] Step S2: Calculate the road condition elevation information during vehicle operation, and determine the road condition elevation setting based on the elevation information.

[0008] Step S3: Obtain the target gearbox shift program corresponding to the determined road condition and altitude gear, and use the target gearbox shift program to calibrate the gearbox.

[0009] In one implementation of this application, step S1 specifically includes: step S11: pre-dividing the road condition elevation into plain driving conditions, hill driving conditions, and mountain driving conditions; step S12: pre-setting the elevation range of the plain driving conditions, the elevation range of the hill driving conditions, and the elevation range of the mountain driving conditions; step S13: creating a plain type program for the plain driving conditions, a hill type program for the hill driving conditions, and a mountain type program for the mountain driving conditions.

[0010] In one implementation of this application, step S12 specifically involves: setting the elevation range for plain conditions to [0, 200(1+a%)], where a% is a first set ratio; setting the elevation range for mountain conditions to [501(1+b%), 2000], where b% is a second set ratio; and setting the elevation range for hilly conditions to [200(1+a%), 501(1+b%)].

[0011] In one implementation of this application, the values ​​of the first set ratio and the second set ratio are related to the difference in the square of altitude. When the difference in the square of altitude in plain conditions is less than or equal to 100 and the difference in the square of altitude in hilly conditions is less than or equal to 150, the first set ratio and the second set ratio take the maximum value. The range of the values ​​of the first set ratio and the second set ratio is [-1, 0].

[0012] In one implementation of this application, step S13 specifically involves: retrieving the engine speed range during upshifting and downshifting in the vehicle's economy mode, and setting it as the adjustment range for the engine speed parameters of the transmission shift program; creating a hilly program based on the retrieved transmission shift program in the economy mode, and configuring the hilly program for use in hilly driving conditions; using the hilly program as a reference, adjusting the engine speed range set for upshifting and downshifting in the transmission to a lower level to form a flat-type program, and configuring the flat-type program for use in plain driving conditions; using the hilly program as a reference, adjusting the engine speed range set for upshifting and downshifting in the transmission to a higher level to form a mountain-type program, and configuring the flat-type program for use in mountain driving conditions.

[0013] In one implementation of this application, step S2 specifically includes: Step S21: During vehicle operation, the GPS sensor collects altitude data and uploads the altitude data to the CAN bus; Step S22: The vehicle electronic control unit (MCU) determines the vehicle's altitude operating mode based on altitude H; when 0 ≤ H ≤ 200(1+a%), the vehicle is determined to be in the plain operating mode; when 200(1+a%) < H < 500(1+b%), the vehicle is determined to be in the hilly operating mode; when 500(1+b%) ≤ H ≤ 2000, the vehicle is determined to be in the mountainous operating mode.

[0014] In one implementation of this application, step S3 specifically comprises: Step S31: Obtaining the vehicle's road condition and altitude settings; when the vehicle is in the plains setting, proceeding to step S32; when the vehicle is in the hills setting, proceeding to step S33; when the vehicle is in the mountains setting, proceeding to step S34; Step S32: Using the plains program as the target transmission program, proceeding to step S35; Step S33: Using the hills program as the target transmission program, proceeding to step S35; Step S34: Using the mountains program as the target transmission program, proceeding to step S35; Step S35: Calibrating the transmission using the target transmission program.

[0015] In one implementation of this application, step S35 specifically includes: replacing the engine speed during upshifting in the standard program with the engine speed during upshifting in each gear of the target transmission program; replacing the engine speed during downshifting in the standard program with the engine speed during downshifting in each gear of the target transmission program; controlling the engine speed to determine and execute upshifting or downshifting of the transmission based on the upshifting and downshifting speeds set in the target transmission program.

[0016] On the other hand, this application also provides an automatic transmission shift program control device, the device comprising: a transmission shift program gear creation module, used to pre-divide vehicle road condition elevation data by gear and create a transmission program for each gear; a vehicle road condition elevation gear determination module, used to calculate road condition elevation information during vehicle operation and determine the vehicle road condition elevation gear based on the road condition elevation information; and a transmission program calibration module, used to obtain the target transmission program corresponding to the determined vehicle road condition elevation gear and calibrate the transmission using the target transmission program.

[0017] This application provides an automatic transmission shift program control method and device, which has the following beneficial effects: It pre-sets an economic mode transmission program for different road conditions and altitudes, automatically matches the transmission program to the altitude range, and calibrates the transmission to adapt to different terrains and altitudes. It automatically controls the transmission shift speed, preventing engine operating conditions from deviating from the economic operating range due to changes in torque demand caused by terrain changes, thus keeping the engine operating conditions within the economic range and improving the overall vehicle economy. Furthermore, this invention has a reliable design principle, a simple structure, and a very wide range of applications. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0019] Figure 1 A flowchart of an automatic transmission shift program control method provided in this application embodiment;

[0020] Figure 2 This is a diagram illustrating the composition of an automatic transmission shift program control device provided in an embodiment of this application. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] This application provides an automatic transmission shift program control method and apparatus. The technical solutions proposed in this application will be described in detail below with reference to the accompanying drawings.

[0023] Figure 1 A flowchart illustrating a method provided in an embodiment of this application. Figure 1 As shown, the method mainly includes the following steps:

[0024] Step S1: Pre-classify the vehicle's road condition elevation according to gear, and create a gearbox shifting program for each gear's road condition elevation information.

[0025] Step S2: Calculate the road condition elevation information during vehicle operation, and determine the road condition elevation setting based on the elevation information.

[0026] Step S3: Obtain the target gearbox shift program corresponding to the determined road condition and altitude gear, and use the target gearbox shift program to calibrate the gearbox.

[0027] In this embodiment of the application, step S1 specifically includes: step S11: pre-dividing the road condition elevation into plain driving conditions, hill driving conditions, and mountain driving conditions; step S12: pre-setting the elevation range of the plain driving conditions, the elevation range of the hill driving conditions, and the elevation range of the mountain driving conditions; step S13: creating a plain type program for the plain driving conditions, a hill type program for the hill driving conditions, and a mountain type program for the mountain driving conditions.

[0028] In this embodiment of the application, step S12 specifically involves: setting the elevation range for plain conditions to [0, 200(1+a%)], where a% is a first set ratio; setting the elevation range for mountain conditions to [501(1+b%), 2000], where b% is a second set ratio; and setting the elevation range for hilly conditions to [200(1+a%), 501(1+b%)]. For example, a% can be -25%, and b% can be -40%.

[0029] In this embodiment of the application, the values ​​of the first set ratio and the second set ratio are related to the difference in the square of altitude. When the difference in the square of altitude in plain conditions is less than or equal to 100 and the difference in the square of altitude in hilly conditions is less than or equal to 150, the first set ratio and the second set ratio take the maximum value. The range of the values ​​of the first set ratio and the second set ratio is [-1, 0].

[0030] In this embodiment, step S13 specifically involves: retrieving the engine speed range during upshifts and downshifts in the vehicle's economy mode, setting it as the adjustment range for the engine speed parameters of the transmission shift program, with the 7th gear upshift speed at 1600 rpm and the 8th gear downshift speed at 1250 rpm; creating a hilly program based on the retrieved transmission shift program in economy mode, and configuring the hilly program for hilly driving conditions; using the hilly program as a reference, adjusting the engine speed range set for upshifts and downshifts in the transmission to a lower level, with the 7th gear upshift speed at 1550 rpm and the 8th gear downshift speed at 1150 rpm, forming a flat-type program, and configuring the flat-type program for plain driving conditions; using the hilly program as a reference, adjusting the engine speed range set for upshifts and downshifts in the transmission to a higher level, with the 7th gear upshift speed at 1650 rpm and the 8th gear downshift speed at 1300 rpm, forming a mountain-type program, and configuring the flat-type program for mountain driving conditions.

[0031] In this embodiment of the application, step S2 specifically includes: Step S21: During vehicle operation, the GPS sensor collects altitude data and uploads the altitude data to the CAN bus; Step S22: The vehicle electronic control unit (MCU) determines the vehicle's altitude operating mode corresponding to altitude H; when 0≤H≤200(1+a%), the vehicle is determined to be in the plain operating mode; when 200(1+a%)<H<500(1+b%), the vehicle is determined to be in the hilly operating mode; when 500(1+b%)≤H≤2000, the vehicle is determined to be in the mountainous operating mode. Taking a% as -25% and b% as -40% as an example, when the vehicle's altitude H fluctuates by -25% above 0 meters and 200 meters, H belongs to the plain driving condition gear; when the vehicle's altitude H fluctuates by -25% above 200 meters and by -40% above 501 meters, H belongs to the hilly driving condition gear; when the vehicle's altitude H fluctuates by -40% above 501 meters and by 2000 meters, H belongs to the mountain driving condition gear.

[0032] For example, when a 4×2 truck is traveling between Kunming and Maoming, the altitude difference is set as follows: a% is -25% and b% is -40%. When the altitude H is in the range of [0, 150], the vehicle's altitude road condition corresponds to the plains condition; when the altitude H is in the range of (150, 300), the vehicle's altitude road condition corresponds to the hilly condition; and when the altitude H is in the range of [300, 2000], the vehicle's altitude road condition corresponds to the mountain condition.

[0033] In this embodiment of the application, step S3 specifically includes: Step S31: Obtain the vehicle's road condition and altitude settings; when the vehicle is in the plains setting, proceed to step S32; when the vehicle is in the hills setting, proceed to step S33; when the vehicle is in the mountains setting, proceed to step S34; Step S32: Use the plains program as the target transmission program, proceed to step S35; Step S33: Use the hills program as the target transmission program, proceed to step S35; Step S34: Use the mountains program as the target transmission program, proceed to step S35; Step S35: Use the target transmission program to calibrate the transmission.

[0034] In this embodiment of the application, step S35 specifically includes: replacing the engine speed during upshifting in each gear of the target transmission program with the engine speed during upshifting in the standard program; replacing the engine speed during downshifting in each gear of the target transmission program with the engine speed during downshifting in the standard program; controlling the engine speed, and determining and executing the upshifting or downshifting of the transmission according to the upshifting and downshifting speeds set in the target transmission program. For example, a 4×2 truck traveling from Kunming to Maoming experiences varying altitudes. When traveling between Kunming and Baise, the altitude range is 300-2000 meters. The ECU determines this is mountainous terrain and calibrates a mountain-type transmission program accordingly. When traveling between Baise and Nanning, the altitude range is 150-300 meters, and the ECU determines this is hilly terrain, calibrating a hill-type transmission program accordingly. When traveling between Nanning and Maoming, the altitude range is 7-150 meters, and the ECU determines this is plains terrain, calibrating a plains-type transmission program accordingly. In this embodiment, the average fuel consumption is 19.20 L / 100km when the vehicle is initially set to the economy mode transmission program. After switching to the throttle MAP of this invention, the average fuel consumption drops to 18.04 L / 100km, achieving the goal of improving fuel economy.

[0035] On the other hand, this application also provides an automatic transmission shift program control device, such as... Figure 2 As shown, the device includes: a gearbox shifting program gear creation module 201, used to pre-divide vehicle road condition altitude data by gear and create a gearbox program for each gear; a vehicle road condition altitude gear determination module 202, used to calculate road condition altitude information during vehicle operation and determine the vehicle road condition altitude gear based on the road condition altitude information; and a gearbox program calibration module 203, used to obtain the target gearbox program corresponding to the determined vehicle road condition altitude gear and use the target gearbox program to calibrate the gearbox.

[0036] The various embodiments in this application are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the device embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions of the method embodiments.

[0037] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0038] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. An automatic transmission shift schedule control method characterized by, The method includes the following steps: Step S1: Pre-classify vehicle road condition elevation according to gear, and create a gearbox shifting program for each gear's road condition elevation information; Step S1 specifically includes: Step S11: Pre-classify road condition elevation into plain driving mode, hill driving mode, and mountain driving mode; Step S12: Pre-set the elevation range for plain driving mode, hill driving mode, and mountain driving mode; Step S13: Create a plain-type program for plain driving mode, a hill-type program for hill driving mode, and a mountain-type program for mountain driving mode; Step S13 specifically involves: retrieving the vehicle's economy mode. The engine speed range during upshifts and downshifts is set as the adjustment range for the engine speed parameters in the transmission shift program; a hilly program is created based on the transmission shift program in economy mode, and the hilly program is configured for use in hilly driving conditions; based on the hilly program, the engine speed range set for upshifts and downshifts is adjusted downwards to form a flat program, and the flat program is configured for use in plain driving conditions; based on the hilly program, the engine speed range set for upshifts and downshifts is adjusted upwards to form a mountain program, and the flat program is configured for use in mountain driving conditions. Step S2: Calculate road condition elevation information during vehicle operation and determine the road condition elevation setting based on the elevation information; Step S3: Obtain the target gearbox shift program corresponding to the determined road condition and altitude gear, and use the target gearbox shift program to calibrate the gearbox.

2. The automatic transmission shift schedule control method according to claim 1, characterized by, Step S12 specifically includes: The elevation range for plain working conditions is set to [0, 200(1+a%)], where a% is the first set ratio; The altitude range for mountainous terrain is set as [501(1+b%), 2000], where b% is the second set ratio; The elevation range for hilly conditions is set as [200(1+a%), 501(1+b%)].

3. The automatic transmission shift schedule control method according to claim 2, characterized by, The values ​​of the first set ratio and the second set ratio are related to the difference in the square of altitude. When the difference in the square of altitude in plain conditions is less than or equal to 100 and the difference in the square of altitude in hilly conditions is less than or equal to 150, the first set ratio and the second set ratio take the maximum value. The range of the values ​​of the first set ratio and the second set ratio is [-1, 0].

4. The automatic transmission shift program control method according to claim 1, characterized in that, Step S2 specifically includes: Step S21: During vehicle operation, the GPS sensor collects altitude data and uploads the altitude data to the CAN bus; Step S21: The vehicle's electronic control unit (MCU) determines the vehicle's altitude operating mode corresponding to altitude H; When 0≤H≤200(1+a%), the vehicle is determined to be in plain driving mode. When 200(1+a%) < H < 500(1+b%), the vehicle is determined to be in hilly driving condition mode. When 500(1+b%)≤H≤2000, the vehicle is determined to be in mountain driving mode.

5. The automatic transmission shift program control method according to claim 1, characterized in that, Step S3 specifically includes: Step S31: Obtain vehicle road condition, altitude, and operating conditions; when the vehicle is in the plain operating conditions mode, proceed to step S32; when the vehicle is in the hilly operating conditions mode, proceed to step S33; when the vehicle is in the mountainous operating conditions mode, proceed to step S34. Step S32: Using the flat-type program as the target gearbox program, proceed to step S35; Step S33: Using the hilly program as the target gearbox program, proceed to step S35; Step S34: Using the mountain-type program as the target gearbox program, proceed to step S35; Step S35: Calibrate the transmission using the target transmission program.

6. The automatic transmission shift program control method according to claim 5, characterized in that, Step S35 specifically includes: Replace the engine speed during upshifts in the standard program with the engine speed during upshifts in the target transmission program. Replace the engine speed during downshifting in the standard program with the engine speed during downshifting in the target transmission program. Control the engine speed and determine and execute the upshift or downshift of the transmission based on the upshift and downshift speeds set in the target transmission program.

7. An automatic transmission shift program control device, characterized in that, The device includes: The gearbox shift program creation module is used to pre-divide vehicle road condition and altitude data by gear and create a gearbox program for each gear. Specifically, it includes: Step S11: Pre-dividing road condition and altitude into plain driving mode, hill driving mode, and mountain driving mode; Step S12: Pre-setting the altitude ranges for plain driving mode, hill driving mode, and mountain driving mode; Step S13: Creating a plain-type program for plain driving mode, a hill-type program for hill driving mode, and a mountain-type program for mountain driving mode; Step S13 specifically involves: retrieving the vehicle's economy mode... The engine speed range during upshifting and downshifting is set as the adjustment range of the engine speed parameters in the transmission shift program; a hilly program is created based on the transmission shift program in the retrieved economy mode, and the hilly program is configured for use in hilly driving conditions; based on the hilly program, the engine speed range set for upshifting and downshifting is adjusted downwards to form a flat program, and the flat program is configured for use in plain driving conditions; based on the hilly program, the engine speed range set for upshifting and downshifting is adjusted upwards to form a mountain program, and the flat program is configured for use in mountain driving conditions. The vehicle road condition altitude setting determination module is used to calculate road condition altitude information during vehicle operation and determine the vehicle road condition altitude setting based on the road condition altitude information. The transmission program calibration module is used to obtain the target transmission program corresponding to the determined vehicle road conditions and altitude gear, and to calibrate the transmission using the target transmission program.

Images