An automatic heavy truck weight blocking multi-mode engine brake control method, device and medium

Abstract

The application discloses an automatic gear heavy truck multi-mode engine brake control method, equipment and medium, the method comprises the following steps: determining whether the engine enters the gearbox shift mode in the multi-mode engine brake according to the gear signal in the automatic gear heavy truck vehicle information, determining whether the engine brake enters the condition when it is not shifting, if yes, receiving the engine brake instruction to control the engine to enter the corresponding engine brake mode; determining the target brake power percentage of the engine brake in the engine brake mode of the driver and the target speed in the automatic constant speed engine brake mode; determining the brake gear level matched with the brake torque of the target brake power percentage or the target speed of the brake power range and adjusting the brake power; when the rising rate of the vehicle speed or the engine speed exceeds the threshold value in the preset time interval, the engine has the risk of overspeed, the emergency brake mechanism in the emergency full brake mode is started, and the multi-mode engine brake control of the automatic gear heavy truck is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engine control, in particular to an automatic transmission heavy truck multi-mode engine brake control method, device and medium. BACKGROUND

[0002] With the tightening of commercial vehicle operation safety regulations, the importance of vehicle operation safety is increasing. For example, according to JT / T1178.2, the tractor should be equipped with a retarder or other auxiliary braking device, and the performance should meet the requirements of GB12676 type II test, which will be implemented on May 1, 2020. And due to the limitation of engine displacement and engine brake power in the early stage, the existing technology often uses the scheme of engine brake + hydraulic retarder or electric eddy current retarder, which will cause the cost of terminal users to increase too much.

[0003] With the gradual increase of engine displacement, larger displacement models of tractors are also being introduced, and the brake power of single engine has reached 300-500kw level. Multi-stage output engine brake has the mode to replace the traditional hydraulic retarder and has cost advantage. However, when replacing the additional retarder, the traditional 2-3 stage engine cylinder has few brake gears, unstable brake force, and cannot realize the scene demand of vehicle constant speed downhill running. SUMMARY

[0004] The embodiments of the present application provide an automatic transmission heavy truck multi-mode engine brake control method, device and medium, to solve the technical problem that the existing 2-3 stage engine cylinder has few brake gears, unstable brake force, and cannot realize the scene demand of vehicle constant speed downhill running.

[0005] In one aspect, the embodiments of the present application provide an automatic transmission heavy truck multi-mode engine brake control method, comprising:

[0006] Receiving vehicle information of an automatic transmission heavy truck, and determining whether the engine enters a gearbox shift mode in multi-mode engine brake according to a gear signal in the vehicle information;

[0007] In the case that the gear signal is non-shift, determining whether the engine meets the entering condition of engine brake, if yes, receiving an engine brake instruction sent by the driver to control the engine to enter the corresponding engine brake mode; the engine brake instruction is used to indicate the driver engine brake mode or automatic constant speed engine brake mode;

[0008] determining a target brake power percentage of engine braking in the case that the engine enters the driver engine braking mode, and determining a target vehicle speed of engine braking in the case that the engine enters the automatic constant-speed engine braking mode;

[0009] determining a brake gear corresponding to a brake power range corresponding to the target brake power percentage or the target vehicle speed, and adjusting brake power in the brake gear according to the brake power range corresponding to the target brake power percentage or the target vehicle speed;

[0010] obtaining a vehicle speed and an engine speed in a preset time interval, and determining that the engine has an overspeed risk in the case that an ascending rate of the vehicle speed in the preset time interval exceeds a first preset threshold or an ascending rate of the engine speed in the preset time interval exceeds a second preset threshold;

[0011] in the case that the engine has the overspeed risk, entering the automatic heavy-duty vehicle into an emergency full-braking mode, and starting an emergency brake mechanism of the engine to realize multi-mode engine braking control of the automatic heavy-duty vehicle.

[0012] In an implementation manner of the present application, the vehicle information of the automatic heavy-duty vehicle is received, and it is determined whether the engine enters a gearbox shifting mode in the multi-mode engine braking according to a gear signal in the vehicle information, specifically including:

[0013] the vehicle information corresponding to the automatic heavy-duty vehicle is received by an engine controller, and a gear signal in the vehicle information is determined; the vehicle information at least includes a vehicle signal, a slope signal, a vehicle weight value and the gear signal;

[0014] in the case that the gear signal is an upshifting process signal, it is determined that the engine enters the gearbox shifting mode in the multi-mode engine braking, and a current gear and a target gear of the engine are obtained;

[0015] a speed difference value corresponding to upshifting of the engine from the current gear to the target gear is calculated, and a brake gear number of an engine brake to be called is determined according to the speed difference value;

[0016] the engine brake is called by the brake gear number of the engine brake to be called, the corresponding engine speed is reduced, and upshifting of the engine is realized.

[0017] In an implementation manner of the present application, in the case that the gear signal is a non-shifting signal, it is determined whether the engine meets an entering condition of engine braking, specifically including:

[0018] In a case that the gear signal of the engine is non-shifting, it is determined that the engine does not enter the gear shifting mode of the gearbox, and according to the accelerator signal, the neutral signal, the brake signal and the vehicle speed signal in the vehicle information of the automatic heavy-duty truck, it is determined whether the engine meets the entering condition of the engine braking.

[0019] The entering condition includes that the accelerator pedal of the automatic heavy-duty truck is not stepped on, the gearbox is in neutral, the engine is in the state of reverse drag without fuel injection, and the engine speed is greater than the speed corresponding to the preset effective braking power.

[0020] In an implementation manner of the present application, if yes, the engine braking instruction sent by the driver is received to control the engine to enter the corresponding engine braking mode, specifically including:

[0021] In a case that the engine meets the entering condition of the engine braking, the engine braking instruction sent by the driver is received based on the click trigger of the driver, and the engine braking mode corresponding to the engine braking instruction is determined;

[0022] In a case that the engine braking mode is the driver engine braking mode, the engine is controlled to enter the driver engine braking mode;

[0023] In a case that the engine braking mode is the automatic constant-speed engine braking mode, the engine is controlled to enter the automatic constant-speed engine braking mode.

[0024] In an implementation manner of the present application, the braking gear level corresponding to the braking torque matched with the braking power range and the target braking power percentage or the target vehicle speed is determined according to the braking power range corresponding to a plurality of braking gear levels, specifically including:

[0025] The current vehicle speed and the current gearbox speed ratio of the automatic heavy-duty truck are determined, and the current speed of the engine is calculated according to the current vehicle speed and the current gearbox speed ratio;

[0026] The braking power that can be obtained by the engine at the current speed is determined according to the current speed of the engine and the braking power corresponding to each braking gear level of the engine at the current speed, and the demand braking power percentage of the engine is calculated through PID and the braking power that can be obtained;

[0027] The vehicle speed deviation between the current vehicle speed and the target vehicle speed is determined, and the target braking gear level is determined in the braking power range corresponding to a plurality of braking gear levels according to the vehicle speed deviation and the demand braking power percentage;

[0028] The target brake gear is used to represent a brake gear whose brake power range matches the target brake power percentage in the driver engine brake mode, or a brake gear whose brake torque corresponding to the target vehicle speed in the automatic constant engine brake mode matches the brake power range.

[0029] In an implementation form of the application, the adjusting the brake power at the brake gear specifically comprises:

[0030] In the case that the engine enters the driver engine brake mode, the gear of the gearbox at the brake gear is shifted up or down based on a preset brake power interval gear to adjust the required brake power percentage to the target brake power percentage;

[0031] In the case that the engine enters the automatic constant engine brake mode, the gear of the gearbox at the brake gear is shifted up or down based on a preset brake torque interval gear to adjust the current vehicle speed to the target vehicle speed.

[0032] In an implementation form of the application, the obtaining the vehicle speed and the engine speed in a preset time interval, and determining that the engine has an overspeed risk in the case that the rising rate of the vehicle speed in the preset time interval exceeds a first preset threshold or the rising rate of the engine speed in the preset time interval exceeds a second preset threshold specifically comprises:

[0033] The engine controller monitors the vehicle speed and the engine speed of the automatic transmission heavy truck, and determines the rising rate of the vehicle speed and the rising rate of the engine speed in a preset time interval;

[0034] The rising rate of the vehicle speed is compared with the first preset threshold, and the rising rate of the engine speed is compared with the second preset threshold;

[0035] In the case that the rising rate of the vehicle speed is greater than the first preset threshold or the rising rate of the engine speed is greater than the second preset threshold, it is determined that the engine has an overspeed risk, and an overspeed warning is sent to the cab instrument display.

[0036] In an implementation form of the application, in the case that the engine has an overspeed risk, the automatic transmission heavy truck enters an emergency full brake mode, and an emergency brake mechanism of the engine is started to realize multi-mode engine braking of the automatic transmission heavy truck, specifically comprising:

[0037] In the case that the engine has an overspeed risk, the automatic transmission heavy truck enters an emergency full brake mode, and an emergency brake mechanism of the engine is started to reduce the speed of the engine;

[0038] The brake tail light of the automatic transmission heavy truck is turned on to remind the rear vehicle, and multi-mode engine brake control of the automatic transmission heavy truck is realized.

[0039] In another aspect, the embodiment of the present application further provides an automatic transmission heavy truck multi-mode engine brake control device, the device comprises:

[0040] at least one processor;

[0041] and a memory connected in communication with the at least one processor;

[0042] wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform an automatic transmission heavy truck multi-mode engine brake control method as described above.

[0043] In another aspect, the embodiment of the present application further provides a non-volatile computer storage medium, which stores computer executable instructions, and the computer executable instructions are configured to:

[0044] an automatic transmission heavy truck multi-mode engine brake control method as described above.

[0045] The embodiment of the present application provides an automatic transmission heavy truck multi-mode engine brake control method, device and medium, which at least has the following beneficial effects:

[0046] By obtaining the vehicle information of the automatic transmission heavy truck, it is determined whether the corresponding gear signal is upshift, and then it is determined whether to enter the gear shifting mode of the transmission according to the gear signal. In the case of no gear shifting, it is further determined whether the engine meets the entering condition of the engine brake. On the basis of meeting the entering condition, the engine enters the corresponding engine brake mode according to the engine brake instruction sent by the driver. In this way, without relying on the vehicle retarder, only by cooperating the engine brake and the gear of the transmission, the braking demand of the automatic transmission heavy truck when descending can be met. In the case of entering the engine brake mode of the driver or the automatic constant speed engine brake mode, the brake gear level matched with the brake power range is determined according to the target brake power percentage or the target vehicle speed, and then the brake power is adjusted at the selected brake gear level, so that the engine is always kept in a reasonable speed range, the target brake power percentage or the target vehicle speed is maintained, the risk of overspeed is reduced, and the engine brake control of the automatic transmission heavy truck is realized. BRIEF DESCRIPTION OF DRAWINGS

[0047] The drawings described herein are used to provide further understanding of the present application, and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0048] Figure 1 A flowchart of an automatic gear heavy truck multi-mode engine brake control method provided by an embodiment of the present application is shown in the figure.

[0049] Figure 2 An organizational architecture diagram of an automatic gear heavy truck multi-mode engine brake control system provided by an embodiment of the present application is shown in the figure.

[0050] Figure 3 A schematic diagram of brake power rapid adjustment of gear shift assistance provided by an embodiment of the present application is shown in the figure.

[0051] Figure 4 An internal structure schematic diagram of an automatic gear heavy truck multi-mode engine brake control device provided by an embodiment of the present application is shown in the figure. DETAILED DESCRIPTION

[0052] To make the objectives, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described below in detail with reference to the embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0053] The embodiments of the present application provide an automatic gear heavy truck multi-mode engine brake control method, device and medium. By obtaining the whole vehicle information of the automatic gear heavy truck, it is determined whether the corresponding gear signal is upshift. Then, it is determined whether to enter the gear shift mode of the transmission according to the gear signal. In the case of no gear shift, it is further determined whether the engine meets the entering condition of the engine brake. On the basis of meeting the entering condition, the engine enters the corresponding engine brake mode according to the engine brake instruction sent by the driver. In this way, without relying on the whole vehicle retarder, only by cooperating the engine brake and the gear of the transmission, the braking demand of the automatic gear heavy truck when descending can be met. In the case of entering the engine brake mode of the driver or the automatic constant speed engine brake mode, the brake gear level matched with the brake power range is determined according to the target brake power percentage or the target vehicle speed. Then, the brake power is adjusted at the selected brake gear level, so that the engine always remains in a relatively reasonable speed range, the target brake power percentage or the target vehicle speed is maintained, the risk of overspeed is reduced, and the engine brake control of the automatic gear heavy truck is realized.

[0054] The technical solutions provided by the embodiments of the present application will be described in detail below with reference to the drawings.

[0055] Figure 1 A flowchart of an automatic gear heavy truck multi-mode engine brake control method provided by an embodiment of the present application is shown in the figure.Figure 1 As shown in the method for controlling the multi-mode engine brake of the automatic transmission heavy truck according to the embodiment of the application, the method comprises the following steps.

[0056] 101, receiving the vehicle information of the automatic transmission heavy truck, and determining whether the engine enters the gearbox shift mode in the multi-mode engine brake according to the gear signal in the vehicle information.

[0057] Specifically, in one embodiment of the application, the server receives the vehicle information corresponding to the automatic transmission heavy truck through the engine controller, and determines the gear signal in the vehicle information. It should be noted that the vehicle information in the embodiment of the application at least includes the vehicle signal, the slope signal, the vehicle weight value and the gear signal, and the vehicle signal includes the clutch signal, the brake signal, the neutral signal, the throttle signal and the vehicle speed signal.

[0058] In the case that the gear signal is the upshift process signal, the server determines that the engine enters the gearbox shift mode in the multi-mode engine brake, and obtains the current gear and the target gear of the engine, and then calculates the speed difference value corresponding to the upshift of the engine from the current gear to the target gear, and determines the number of brake gears to be called according to the speed difference value, and then the server calls the engine brake gear through the number of brake gears to be called, reduces the corresponding engine speed, and realizes the upshift of the engine.

[0059] It should be noted that in the gearbox shift mode, the greater the upshift speed difference, the more engine brake gears need to be called, and more brake gears will accelerate the decline of the engine speed, so that the speed difference is eliminated in a shorter time. Therefore, the server determines the number of brake gears based on the upshift signal required for the engine to reduce the speed difference from the current gear to the target gear.

[0060] Figure 2 The organizational architecture diagram of the automatic transmission heavy truck multi-mode engine brake control system provided by the embodiment of the application is shown in the figure. Figure 2 As shown in the method for controlling the multi-mode engine brake of the automatic transmission heavy truck according to the embodiment of the application, the method comprises the following steps.

[0061] 102、In the case that the gear signal is non-shift, determine whether the engine meets the entering condition of engine brake, if yes, receive the engine brake instruction sent by the driver to control the engine to enter the corresponding engine brake mode.

[0062] Specifically, in one embodiment of the present application, in the case that the gear signal in the vehicle information is non-shift, and the engine controller ECU of the automatic transmission heavy truck does not receive the upshift or downshift instruction from the automatic transmission controller TCU, the engine brake is allowed to enter the driver engine brake mode or the automatic constant speed engine brake mode. The prerequisite for the engine to enter the driver engine brake mode or the automatic constant speed engine brake mode is that the driver does not step on the accelerator pedal (no acceleration demand), the transmission is not in neutral (transmission system connection state), the engine is not in the state of oil injection and is in the state of reverse drag (in the deceleration stage), and the engine speed is greater than n0 (to ensure the minimum effective brake power, the lower the engine speed, the lower the engine brake power). In the case that the above entering conditions are met, the server can enter the corresponding brake mode based on the click trigger of the driver pressing the engine brake activation switch.

[0063] In one embodiment of the present application, in the case that the engine meets the entering condition of engine brake, the server receives the engine brake instruction sent by the driver based on the click trigger of the driver, and determines the engine brake mode corresponding to the engine brake instruction. In the case that the engine brake mode is the driver engine brake mode, the engine is controlled to enter the driver engine brake mode, or in the case that the engine brake mode is the automatic constant speed engine brake mode, the engine is controlled to enter the automatic constant speed engine brake mode.

[0064] 103、In the case that the engine enters the driver engine brake mode, determine the target brake power percentage of the engine brake, and in the case that the engine enters the automatic constant speed engine brake mode, determine the target speed of the engine brake.

[0065] In the case that the engine wants to enter the driver engine brake mode, the server can activate the switch based on the click trigger of the driver on the driver engine brake mode, so as to enter the driver engine brake mode. After entering the driver engine brake mode, the default target brake power percentage can be determined. Then, the server can gradually adjust the size of the current brake power percentage by receiving the click trigger of the driver based on the "+" "-" button.

[0066] In the case that the engine wants to enter the automatic constant-speed engine braking mode, the server activates the switch based on the long press trigger of the driver on the automatic constant-speed engine braking mode for a preset time length, so that the engine enters the automatic constant-speed engine braking mode. The server determines the initial target speed in the automatic constant-speed engine braking mode based on the vehicle running speed when the driver long-presses the switch. In the automatic constant-speed engine braking mode, the server can also receive the driver's increase or decrease of the target speed value of the constant running through the "+" and "-" buttons, adjust the new target speed value, and restart the closed-loop control process of the vehicle speed based on the above process.

[0067] 104. Determine the braking gear level matched with the braking torque corresponding to the target braking power percentage or target speed in the braking power range corresponding to the plurality of braking gear levels, and adjust the braking power in the braking gear level.

[0068] Specifically, in an embodiment of the present application, the server determines the current speed of the automatic transmission heavy truck and the current transmission gear ratio, and calculates the current speed of the engine according to the current speed and the current transmission gear ratio, and then determines the braking power that can be obtained by the engine at the current speed according to the current speed of the engine and the braking power corresponding to each braking gear level of the engine at the current speed, and calculates the required braking power percentage of the engine through PID and the obtainable braking power.

[0069] Then, the server also needs to determine the speed deviation between the current speed and the target speed, and determine the target braking gear level in the braking power range corresponding to the plurality of braking gear levels according to the speed deviation and the required braking power percentage. It should be noted that the target braking gear level in the embodiment of the present application is used to represent the braking gear level matched with the target braking power percentage of the driver in the engine braking mode, or the braking gear level matched with the braking torque corresponding to the target speed in the automatic constant engine braking mode.

[0070] Specifically, in an embodiment, in the case that the engine enters the driver engine braking mode, the server performs gear up or down operation on the transmission in the braking gear level based on the preset braking power interval gear, so as to adjust the required braking power percentage to the target braking power percentage, and in the case that the engine enters the automatic constant-speed engine braking mode, the server performs corresponding gear up or down operation on the transmission in the braking gear level based on the preset braking torque interval gear, so as to adjust the current speed to the target speed.

[0071] Figure 3 The schematic diagram of the shift-assisted braking power rapid adjustment provided by the embodiment of the present application is as follows. Figure 3As shown, in the case of the engine entering the driver engine braking mode, the server takes 10% of the maximum braking power as an interval gear, adjusts the required braking power percentage step by step, and selects the actual braking gear closest to the requirement from the multiple gear braking that meets the braking power percentage according to the required braking power percentage (within the upper deviation P2 and the lower deviation P1 of the requirement), such as 30% of the required braking torque, and selects the 2-gear engine braking to meet 28% of the braking torque closest, and the remaining 2% deviation, and the transmission TCU performs the upshift or downshift of the gearbox to reduce or increase the actual braking torque percentage, and the selected upshift or downshift gear ensures that the engine speed after shifting is within the n1-n2 interval and the shifting time is less than t1.

[0072] In the case of the engine entering the automatic constant-speed engine braking mode, the server calculates the adjustment target value of the real-time required wheel-side braking torque based on the target vehicle speed and the current actual vehicle speed, and the system selects the actual braking gear closest to the requirement from the multiple gear braking that meets the braking torque percentage (within the upper deviation P2 and the lower deviation P1 of the requirement), such as 30% of the required braking torque, and selects the 2-gear engine braking to meet 28% of the braking torque closest, and the remaining 2% deviation, and the transmission TCU performs the upshift or downshift of the gearbox to reduce or increase the actual braking torque percentage, and the selected upshift or downshift gear ensures that the engine speed after shifting is within the n1-n2 interval and the shifting time is less than t1.

[0073] 105, obtain the vehicle speed and engine speed within a preset time interval, and in the case that the rising rate of the vehicle speed within the preset time interval exceeds a first preset threshold or the rising rate of the engine speed within the preset time interval exceeds a second preset threshold, determine that the engine has an overspeed risk.

[0074] Specifically, in an embodiment of the present application, the server monitors the vehicle speed and the engine speed of the automatic-gear heavy truck through the engine controller, and determines the rising rate of the vehicle speed and the rising rate of the engine speed within a preset time interval, and then compares the rising rate of the vehicle speed with a first preset threshold and compares the rising rate of the engine speed with a second preset threshold, in the case that the rising rate of the vehicle speed is greater than the first preset threshold or the rising rate of the engine speed is greater than the second preset threshold, determines that the engine has an overspeed risk, and sends an overspeed warning to the cab instrument display.

[0075] In one embodiment, during the operation of the automatic transmission heavy truck, if the engine controller ECU monitors that the vehicle speed rising rate is greater than a first preset threshold A, or the engine speed rising rate is greater than a second preset threshold B, and the duration exceeds a certain time interval t2, the server determines that there is a reliability risk of reverse drag overspeed of the engine, and the engine controller ECU sends an audible and light alarm to the cab instrument display through the bus message CAN to inform the driver of the overspeed risk.

[0076] 106、In the case of overspeed risk, the automatic transmission heavy truck enters the emergency full braking mode, and the emergency braking mechanism of the engine is started to realize multi-mode engine braking control of the automatic transmission heavy truck.

[0077] Specifically, in one embodiment of the present application, the server enters the automatic transmission heavy truck into the emergency full braking mode in the case of overspeed risk, and starts the emergency braking mechanism of the engine to reduce the engine speed, and also turns on the brake tail light of the automatic transmission heavy truck to remind the rear vehicle, realizing multi-mode engine braking control of the automatic transmission heavy truck.

[0078] In one embodiment, in the case of overspeed risk, the server interrupts the fixed braking power percentage in the original driver engine braking mode or the fixed target vehicle speed in the automatic constant speed engine braking mode, and adjusts the engine braking to the maximum braking power to delay the engine speed rising, and turns on the vehicle brake tail light after braking to prevent sudden braking from increasing the rear vehicle.

[0079] The above is the method embodiment of the present application. Based on the same inventive concept, the present application also provides an automatic transmission heavy truck multi-mode engine braking control device, the structure of which is shown in Figure 4 .

[0080] Figure 4 An internal structure diagram of an automatic transmission heavy truck multi-mode engine braking control device provided by an embodiment of the present application is shown in Figure 4 . The device comprises:

[0081] at least one processor;

[0082] and a memory in communication connection with the at least one processor;

[0083] The memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to:

[0084] receive the vehicle information of the automatic transmission heavy truck, and determine whether the engine enters the gearbox shifting mode in the multi-mode engine braking according to the gear signal in the vehicle information;

[0085] determining whether the engine meets an entering condition of the engine braking, and if so, receiving an engine braking instruction sent by the driver to control the engine to enter a corresponding engine braking mode; the engine braking instruction is used to instruct to enter a driver engine braking mode or an automatic constant speed engine braking mode;

[0086] determining a target braking power percentage of the engine braking in the case that the engine enters the driver engine braking mode, and determining a target vehicle speed of the engine braking in the case that the engine enters the automatic constant speed engine braking mode;

[0087] determining a braking gear level corresponding to a braking torque matching the braking power range corresponding to the target braking power percentage or the target vehicle speed according to braking power ranges corresponding to a plurality of braking gear levels, and adjusting the braking power at the braking gear level;

[0088] obtaining a vehicle speed and an engine speed in a preset time interval, and determining that the engine has an overspeed risk in the case that an ascending rate of the vehicle speed in the preset time interval exceeds a first preset threshold or an ascending rate of the engine speed in the preset time interval exceeds a second preset threshold;

[0089] entering the automatic transmission heavy truck into an emergency full braking mode and starting an emergency braking mechanism of the engine to realize multi-mode engine braking control of the automatic transmission heavy truck in the case that the overspeed risk exists.

[0090] The embodiment of the application further provides a nonvolatile computer storage medium, which stores computer executable instructions, and the computer executable instructions are configured to:

[0091] receiving whole vehicle information of the automatic transmission heavy truck, and determining whether the engine enters a gearbox shifting mode in multi-mode engine braking according to a gear signal in the whole vehicle information;

[0092] determining whether the engine meets an entering condition of the engine braking, and if so, receiving an engine braking instruction sent by the driver to control the engine to enter a corresponding engine braking mode; the engine braking instruction is used to instruct to enter a driver engine braking mode or an automatic constant speed engine braking mode;

[0093] determining a target braking power percentage of the engine braking in the case that the engine enters the driver engine braking mode, and determining a target vehicle speed of the engine braking in the case that the engine enters the automatic constant speed engine braking mode;

[0094] According to the brake power range corresponding to the plurality of brake gears, a brake gear that matches the brake torque corresponding to the target brake power percentage or the target vehicle speed in the brake power range is determined, and the brake power is adjusted under the brake gear;

[0095] The vehicle speed and the engine speed in a preset time interval are acquired, and in a case where the rising rate of the vehicle speed in the preset time interval exceeds a first preset threshold or the rising rate of the engine speed in the preset time interval exceeds a second preset threshold, it is determined that the engine has an overspeed risk;

[0096] In a case where the engine has the overspeed risk, the automatic transmission heavy-duty truck is brought into an emergency full-braking mode, and an emergency braking mechanism of the engine is started to realize multi-mode engine braking control of the automatic transmission heavy-duty truck.

[0097] The embodiments in the present application are described in a progressive manner, and the same and similar parts of each embodiment can be referred to each other. Each embodiment mainly describes the difference from other embodiments. Especially, the device and medium embodiments are basically similar to the method embodiments, and thus the description is relatively simple, and the relevant part can be referred to the part of the method embodiment.

[0098] The above describes specific embodiments of the present application. Other embodiments are within the scope of the appended claims. In some cases, the acts or steps recited in the claims can be performed in a different order than that described in the embodiments and still achieve desirable results. In addition, the processes depicted in the figures do not necessarily require the particular order shown or sequential order in order to achieve the desired results. In some implementations, multitasking and parallel processing can be advantageous.

[0099] The device and medium provided by the embodiments of the present application are one-to-one corresponding to the method, and thus the device and medium also have similar beneficial technical effects as the method. Since the beneficial technical effects of the method have been described in detail above, the beneficial technical effects of the device and medium will not be described here.

[0100] Those skilled in the art will appreciate that embodiments of the present application can be provided as methods, systems, or computer program products. Accordingly, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROMs, optical storage media, etc.) having computer-usable program code embodied therein.

[0101] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 one or more flowcharts and / or blocks in the flowcharts and / or combination thereof. Figure 1 one or more flowcharts and / or blocks in the flowcharts and / or combination thereof.

[0102] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 one or more flowcharts and / or blocks in the flowcharts and / or combination thereof. Figure 1 one or more flowcharts and / or blocks in the flowcharts and / or combination thereof.

[0103] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 one or more flowcharts and / or blocks in the flowcharts and / or combination thereof. Figure 1 one or more flowcharts and / or blocks in the flowcharts and / or combination thereof.

[0104] In one typical configuration, the computing device includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.

[0105] The memory can include non-persistent memory and / or volatile memory, such as random access memory (RAM) 620b. The memory can also include non-volatile memory, such as read only memory (ROM) 620a. The memory can be a memory cache, a buffer, a RAM, or other types of non-transitory computer-readable media.

[0106] Computer-readable media includes permanent and non-permanent, movable and non-movable media that can implement information storage by any method or technology. The information can be computer-readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassette, magnetic tape disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information accessible by a computing device. According to the definition herein, computer-readable media does not include transitory media such as modulated data signals and carriers.

[0107] It should also be noted that the terms "comprising", "containing", or any other variant thereof are intended to cover a non-exclusive inclusion, such that a process, method, article or apparatus that comprises a list of elements does not only include those elements, but can also include other elements not expressly listed or inherent to such process, method, article or apparatus. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of additional identical elements in the process, method, article or apparatus that includes the element.

[0108] The above only describes the embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the scope of claims of the present application.

Claims

1. An automatic weight blocking multi-mode engine brake control method, characterized in that, The method comprises: receiving the whole vehicle information of the automatic transmission heavy truck, and determining whether the engine enters the gearbox shift mode in the multi-mode engine brake according to the gear signal in the whole vehicle information; in the case that the gear signal is non-shift, determining whether the engine meets the entering condition of the engine brake, and if yes, receiving the engine brake instruction sent by the driver to control the engine to enter the corresponding engine brake mode; the engine brake instruction is used to indicate entering the driver engine brake mode or the automatic constant speed engine brake mode; in the case that the engine enters the driver engine brake mode, determining the target brake power percentage of the engine brake, and in the case that the engine enters the automatic constant speed engine brake mode, determining the target vehicle speed of the engine brake; determining the brake gear level corresponding to the brake torque matching the brake power range corresponding to the target brake power percentage or target vehicle speed according to the brake power range corresponding to various brake gear levels, and adjusting the brake power at the brake gear level; obtaining the vehicle speed and engine speed in a preset time interval, and in the case that the rising rate of the vehicle speed in the preset time interval exceeds a first preset threshold or the rising rate of the engine speed in the preset time interval exceeds a second preset threshold, determining that the engine has an overspeed risk; in the case that there is an overspeed risk, entering the automatic transmission heavy truck into the emergency full brake mode, and starting the emergency brake mechanism of the engine to realize the multi-mode engine brake control of the automatic transmission heavy truck.

2. The automatic weight blocking multi-mode engine brake control method according to claim 1, characterized in that, The receiving the whole vehicle information of the automatic transmission heavy truck, and determining whether the engine enters the gearbox shift mode in the multi-mode engine brake according to the gear signal in the whole vehicle information, specifically comprises: receiving the whole vehicle information corresponding to the automatic transmission heavy truck through the engine controller, and determining the gear signal in the whole vehicle information; the whole vehicle information at least comprises the whole vehicle signal, the slope signal, the vehicle weight value and the gear signal; in the case that the gear signal is the upshift process signal, determining that the engine enters the gearbox shift mode in the multi-mode engine brake, and obtaining the current gear and the target gear of the engine; calculating the speed difference value corresponding to the upshift of the engine from the current gear to the target gear, and determining the brake gear number of the engine brake to be called according to the speed difference value; calling the engine brake through the brake gear number of the engine brake to be called, reducing the corresponding engine speed, and realizing the upshift of the engine.

3. The automatic weight blocking multi-mode engine brake control method according to claim 1, characterized in that, The determining whether the engine meets the entering condition of the engine brake in the case that the gear signal is non-shift, specifically comprises: in the case that the gear signal of the engine is non-shift, determining that the engine does not enter the gearbox shift mode, and determining whether the engine meets the entering condition of the engine brake according to the accelerator signal, the neutral signal, the brake signal and the vehicle speed signal in the whole vehicle information of the automatic transmission heavy truck; The entering condition includes that an accelerator pedal of the automatic transmission heavy truck is not stepped on, a gearbox is in neutral, an engine is in a reverse drag state without fuel injection, and an engine speed is greater than a speed corresponding to a preset effective braking power.

4. The automatic weight-detecting multi-mode engine brake control method for truck according to claim 1, characterized in that, If so, an engine braking instruction sent by a driver is received to control the engine to enter a corresponding engine braking mode, specifically including: In a case where the engine meets engine braking entering conditions, an engine braking instruction sent by the driver is received based on a click trigger of the driver, and a corresponding engine braking mode of the engine braking instruction is determined; In a case where the engine braking mode is a driver engine braking mode, the engine is controlled to enter the driver engine braking mode; In a case where the engine braking mode is an automatic constant speed engine braking mode, the engine is controlled to enter the automatic constant speed engine braking mode.

5. The automatic weight sensing truck multi-mode engine brake control method of claim 1, wherein, The determination of the braking gear level at which the braking power range matches the target braking power percentage or the braking torque corresponding to the target vehicle speed based on braking power ranges corresponding to a plurality of braking gear levels specifically includes: The current vehicle speed and the current gearbox speed ratio of the automatic transmission heavy truck are determined, and the current speed of the engine is calculated based on the current vehicle speed and the current gearbox speed ratio; The braking power that can be obtained by the engine at the current speed is determined based on the current speed of the engine and the braking power corresponding to each braking gear level of the engine at the current speed, and the demand braking power percentage of the engine is calculated by PID and the braking power that can be obtained; The vehicle speed deviation between the current vehicle speed and the target vehicle speed is determined, and the target braking gear level is determined in the braking power range corresponding to a plurality of braking gear levels based on the vehicle speed deviation and the demand braking power percentage. The target braking gear level is used to represent the braking gear level at which the braking power range matches the target braking power percentage in the driver engine braking mode, or the braking gear level at which the braking power range matches the braking torque corresponding to the target vehicle speed in the automatic constant engine braking mode.

6. The automatic weight blocking multi-mode engine brake control method according to claim 5, characterized in that, The adjustment of the braking power at the braking gear level specifically includes: In a case where the engine enters the driver engine braking mode, the gearbox at the braking gear level is operated to upshift or downshift based on a preset braking power interval gear, so as to adjust the demand braking power percentage to the target braking power percentage; In a case where the engine enters the automatic constant speed engine braking mode, the gearbox at the braking gear level is operated to upshift or downshift based on a preset braking torque interval gear, so as to adjust the current vehicle speed to the target vehicle speed.

7. The automatic weight sensing truck multi-mode engine brake control method of claim 1, wherein, The vehicle speed and the engine speed within a preset time interval are obtained, and in a case where the rising rate of the vehicle speed within the preset time interval exceeds a first preset threshold or the rising rate of the engine speed within the preset time interval exceeds a second preset threshold, it is determined that the engine has an overspeed risk, specifically including: The engine controller monitors the vehicle speed and engine speed of the automatic transmission heavy truck, and determines the rising rate of the vehicle speed and the rising rate of the engine speed within a preset time interval; The rising rate of the vehicle speed is compared with a first preset threshold, and the rising rate of the engine speed is compared with a second preset threshold; If the rising rate of the vehicle speed is greater than the first preset threshold, or the rising rate of the engine speed is greater than the second preset threshold, it is determined that the engine has an overspeed risk, and an overspeed early warning is sent to the cab instrument display.

8. The automatic weight sensing truck multi-mode engine brake control method of claim 1, wherein, In the case of the overspeed risk, the automatic transmission heavy truck is entered into an emergency full braking mode, and an emergency braking mechanism of the engine is started to realize multi-mode engine braking of the automatic transmission heavy truck, specifically including: In the case of the overspeed risk, the automatic transmission heavy truck is entered into an emergency full braking mode, and an emergency braking mechanism of the engine is started to reduce the engine speed; The brake tail light of the automatic transmission heavy truck is turned on to remind the rear vehicle, and multi-mode engine braking control of the automatic transmission heavy truck is realized.

9. An automatic weight sensing truck multi-mode engine brake control apparatus characterized by comprising: The device comprises: at least one processor; and a memory connected in communication with the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform an automatic transmission heavy truck multi-mode engine braking control method according to any one of claims 1-8.

10. A non-transitory computer storage medium storing computer-executable instructions that, when executed, cause a computer to perform: The computer executable instructions are configured to: an automatic transmission heavy truck multi-mode engine braking control method according to any one of claims 1-8.

Images