Control method, device and equipment for heavy commercial vehicle coasting out of gear and medium

Abstract

The application provides a control method, device, equipment and medium for heavy commercial vehicle coasting-out in neutral gear, and belongs to the technical field of heavy commercial vehicle control. The method steps are as follows: a gearbox controller monitors the throttle state during the coasting-in neutral gear process, and takes over the engine control right when detecting the throttle depression signal; the gearbox controller identifies the request for exiting the neutral gear according to the throttle depression depth and duration, and starts the gear shifting process; the gearbox controller judges whether the gear shifting process is completed, and returns the engine control right to the throttle after the gear shifting process is completed. The application accurately identifies the intention of the driver to exit the neutral gear, avoids frequent entering and exiting the coasting-in neutral gear, takes over the engine in time through the gearbox controller, avoids the torque boost injection when the engine is controlled by the throttle, avoids the torque clearing stage after the torque boost, reduces the time for exiting the neutral gear, returns the engine control right in time after the gear shifting is completed, and avoids the torque fluctuation when the engine control mode is switched.

Description

Technical Field

[0001] This invention belongs to the field of heavy-duty commercial vehicle control technology, specifically relating to a control method, device, equipment, and medium for coasting out of neutral in a heavy-duty commercial vehicle. Background Technology

[0002] Coasting in neutral is an economical mode for heavy commercial vehicles. When the vehicle is in coasting conditions, the AMT transmission automatically shifts into neutral, and the vehicle enters coasting mode. When the vehicle is not in coasting conditions, the AMT transmission automatically shifts out of neutral. One of the conditions for disengaging from coasting in neutral is for the driver to press the accelerator.

[0003] Since the throttle is primarily a control component of the engine, when the current driver presses the throttle to disengage from neutral and coast, the engine will respond to the throttle first. The engine torque will increase as the throttle opening increases. Then, the transmission will enter the shifting process. During the shifting process, the increased torque needs to be reduced, the speed adjusted, the gear shifted, and the torque returned. This process will cause necessary fuel injection, which will affect the overall fuel-saving effect of coasting in neutral and is not conducive to the fuel consumption reduction improvement of heavy commercial vehicles.

[0004] In summary, coasting in neutral is an economical mode to improve fuel efficiency in heavy commercial vehicles. One of the existing ways to exit coasting in neutral is by pressing the accelerator. In this way, the engine will respond to the accelerator first, resulting in a necessary increase in engine torque, which will cause fuel injection waste and affect the overall energy-saving effect of coasting in neutral.

[0005] This is a shortcoming of the existing technology. Therefore, it is very necessary to provide a control method, device, equipment and medium for coasting out of neutral gear in heavy commercial vehicles in view of the above-mentioned defects in the existing technology. Summary of the Invention

[0006] In view of the shortcomings of the existing neutral coasting mode exit method, which involves pressing the accelerator to exit, the engine will respond to the accelerator first, resulting in a necessary increase in engine torque, which will cause fuel injection waste and affect the overall energy saving effect of neutral coasting. The present invention provides a control method, device, equipment and medium for exiting neutral coasting in heavy commercial vehicles to solve the above-mentioned technical problems.

[0007] In a first aspect, the present invention provides a control method for exiting neutral coasting mode in a heavy-duty commercial vehicle, comprising the following steps:

[0008] S1. The transmission control unit (TCU) monitors the throttle status during coasting in neutral and takes over engine control when it detects a throttle input signal.

[0009] S2. The transmission control unit (TCU) identifies the request to exit neutral based on the depth and duration of the accelerator pedal being depressed, and initiates the shifting process upon detecting the request.

[0010] S3. The transmission control unit (TCU) determines whether the shifting process is complete, and after the shifting process is complete, it returns engine control to the throttle.

[0011] Furthermore, the specific steps of step S1 are as follows:

[0012] S11. The vehicle is in neutral coasting control mode;

[0013] S12. The transmission control unit (TCU) monitors the throttle status in real time to determine whether there is a throttle input signal.

[0014] If so, proceed to step S13;

[0015] If not, return to step S11;

[0016] S13. The transmission control unit (TCU) takes over engine control.

[0017] Furthermore, the specific steps of step S2 are as follows:

[0018] S21. The transmission controller (TCU) detects whether the throttle opening in the throttle depress signal is greater than the set opening threshold and whether the throttle depress time is greater than the set time threshold.

[0019] If so, proceed to step S22;

[0020] If not, return to step S11;

[0021] S22. The transmission control unit (TCU) controls the start of the shifting process and, during the shifting process, controls the clutch, engine, and AMT actuator to adjust engine speed, shift gears, and reduce torque.

[0022] Furthermore, the specific steps of step S21 are as follows:

[0023] S211. Pre-set the time threshold for pressing the accelerator for each throttle opening;

[0024] S212. Set the time threshold for throttle opening a1 as b1, the time threshold for throttle opening a2 as b3, ..., the time threshold for throttle opening an as bn, where a1 <a2…an-1<an,b1> b2…bn-1>bn;

[0025] S213. The transmission controller TCU determines whether the real-time throttle opening is greater than an and the throttle pressing time is greater than bn; if so, proceed to step S22.

[0026] If not, proceed to step S214;

[0027] S214. The transmission controller TCU determines whether the real-time throttle opening is greater than an-1 and the throttle pressing time is greater than bn-1;

[0028] If so, proceed to step S22;

[0029] If not, proceed to step S215;

[0030] S215. Repeat steps S213 and S214 until a1 and b1. The transmission controller TCU determines whether the real-time throttle opening is greater than a1 and the throttle pressing time is greater than b1.

[0031] If so, proceed to step S22;

[0032] If not, return to step S11.

[0033] Furthermore, the specific steps of step S22 are as follows:

[0034] S221. The transmission control unit (TCU) controls the start-up and shifting process;

[0035] S222. The transmission control unit (TCU) enters the speed regulation stage, and controls the clutch to disengage to the calibrated threshold through the clutch solenoid valve to control the engine speed.

[0036] S223. The transmission controller TCU determines whether the engine speed has reached the requested speed and whether the difference between the engine speed and the input shaft speed is less than the first calibration threshold.

[0037] If so, proceed to step S224;

[0038] If not, wait for the set time period and return to step S223;

[0039] S224. The transmission controller TCU controls the gear shifting stage, controls the clutch position to the required position through the clutch solenoid valve, controls the engine speed to the required speed, and controls the transmission shift valve to operate.

[0040] S225. The transmission controller TCU determines whether the shift valve is in position and whether the difference between the engine speed and the input shaft speed is less than the second calibration threshold.

[0041] If so, proceed to step S226;

[0042] If not, wait for the set time period and return to step S225;

[0043] S226. The transmission controller controls the entry into the torque recovery stage, and controls the clutch engagement through the clutch solenoid valve to control the increase of engine torque.

[0044] Furthermore, the specific steps of step S3 are as follows:

[0045] S31. The transmission control unit (TCU) determines whether the shifting process has been completed.

[0046] If so, proceed to step S32;

[0047] If not, wait for the set time period and return to step S31;

[0048] S32. The transmission control unit (TCU) returns engine control to the throttle.

[0049] Furthermore, in step S31, the transmission controller TCU determines whether the current gear is equal to the selected gear, whether the clutch is fully engaged, whether the requested engine torque is the throttle torque, and delays for a set time period.

[0050] If so, the gear shift is considered complete;

[0051] If not, the gear shift is not yet complete.

[0052] Secondly, the present invention provides a control device for disengaging from neutral coasting in a heavy commercial vehicle, comprising: an engine control takeover module, used to monitor the throttle status during neutral coasting via a transmission controller TCU, and to take over engine control when a throttle depress signal is detected.

[0053] The shift start module is used to identify the request to exit neutral based on the depth and duration of the accelerator pedal being depressed through the transmission controller TCU, and to start the shift process when the request to exit neutral is identified;

[0054] The engine control handover module is used to determine whether the gear shifting process has been completed through the transmission controller TCU, and to hand over engine control to the throttle after the gear shifting process is completed.

[0055] Furthermore, the engine control takeover module includes:

[0056] Neutral coasting unit is used to determine that the vehicle is in neutral coasting control mode;

[0057] The accelerator pedal depressed signal detection unit is used to monitor the accelerator pedal status in real time through the transmission control unit (TCU) and determine whether there is an accelerator pedal depressed signal.

[0058] The engine control takeover unit is used to take over engine control via the transmission controller TCU when there is an accelerator pedal press signal.

[0059] Furthermore, the shift start module includes:

[0060] The neutral gear exit request recognition unit is used to detect, through the transmission controller TCU, whether the throttle opening in the throttle depress signal is greater than a set opening threshold and whether the throttle depress time is greater than a set time threshold.

[0061] The shift initiation unit is used to initiate the shift process when the throttle opening exceeds a set threshold value and the throttle duration exceeds a set time threshold value, based on whether the throttle opening is greater than a set threshold value. During the shift process, the transmission control unit (TCU) controls the clutch, engine, and AMT actuator to adjust engine speed, shift gears, and reduce torque. Furthermore, the engine control handover module includes:

[0062] The shift completion judgment unit is used to determine whether the shift process has been completed through the transmission controller TCU; the engine control handover unit is used to hand over engine control to the throttle through the transmission controller TCU when the shift process is completed.

[0063] Thirdly, the present invention provides an apparatus including a processor and a memory;

[0064] The memory is used to store a computer program, and the processor is used to retrieve and run the computer program from the memory, causing the device to perform the method described in the first aspect above.

[0065] Fourthly, the present invention provides a storage medium,

[0066] The storage medium stores instructions that, when run on a computer, cause the computer to perform the method described in the first aspect above.

[0067] The beneficial effects of this invention are as follows:

[0068] The present invention provides a control method, device, equipment, and medium for exiting neutral coasting in heavy-duty commercial vehicles. By combining throttle depth and throttle pressing time, it accurately identifies the driver's intention to exit neutral, avoiding frequent shifting into and out of neutral. When the throttle is pressed, the transmission controller (TCU) takes over the engine in advance, avoiding torque boosting and fuel injection when the throttle controls the engine, and also avoiding the torque clearing phase after torque boosting. This reduces the time to exit neutral, improves power response performance, and promptly returns engine control to the throttle after gear shifting, avoiding torque fluctuations when switching engine control modes.

[0069] Furthermore, the design principle of this invention is reliable, the structure is simple, and it has a very wide range of application prospects.

[0070] Therefore, it is evident that the present invention has outstanding substantive features and significant progress compared with the prior art, and the beneficial effects of its implementation are also obvious. Attached Figure Description

[0071] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0072] Figure 1 This is a flowchart illustrating an embodiment of the control method for coasting out of neutral gear in a heavy commercial vehicle according to the present invention.

[0073] Figure 2 This is a schematic flowchart of another embodiment of the control method for coasting out of neutral gear in a heavy commercial vehicle according to the present invention.

[0074] Figure 3 This is a schematic diagram of the control device for coasting out of neutral gear in a heavy commercial vehicle according to the present invention. Detailed Implementation

[0075] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0076] Example 1:

[0077] like Figure 1 As shown, the present invention provides a control method for exiting neutral coasting in a heavy commercial vehicle, comprising the following steps:

[0078] S1. The transmission control unit (TCU) monitors the throttle status during coasting in neutral and takes over engine control when it detects a throttle input signal.

[0079] S2. The transmission control unit (TCU) identifies the request to exit neutral based on the depth and duration of the accelerator pedal being depressed, and initiates the shifting process upon detecting the request.

[0080] S3. The transmission control unit (TCU) determines whether the shifting process is complete, and after the shifting process is complete, it returns engine control to the throttle.

[0081] Example 2:

[0082] like Figure 2 As shown, the present invention provides a control method for exiting neutral coasting in a heavy commercial vehicle, comprising the following steps:

[0083] S1. The transmission control unit (TCU) monitors the throttle position during coasting in neutral and takes over engine control when it detects a throttle input signal. The specific steps of S1 are as follows:

[0084] S11. The vehicle is in neutral coasting control mode;

[0085] S12. The transmission control unit (TCU) monitors the throttle status in real time to determine whether there is a throttle input signal.

[0086] If so, proceed to step S13;

[0087] If not, return to step S11;

[0088] S13. The transmission control unit (TCU) takes over engine control.

[0089] S2. The transmission control unit (TCU) identifies the neutral shift request based on the accelerator pedal depress depth and duration, and initiates the shifting process upon detecting the neutral shift request; the specific steps of step S2 are as follows:

[0090] S21. The transmission controller (TCU) detects whether the throttle opening in the throttle depress signal is greater than the set opening threshold and whether the throttle depress time is greater than the set time threshold.

[0091] If so, proceed to step S22;

[0092] If not, return to step S11;

[0093] The specific steps of step S21 are as follows:

[0094] S211. Pre-set the time threshold for pressing the accelerator for each throttle opening;

[0095] S212. Set the time threshold for throttle opening a1 as b1, the time threshold for throttle opening a2 as b3, ..., the time threshold for throttle opening an as bn, where a1 <a2…an-1<an,b1> b2…bn-1>bn;

[0096] S213. The transmission controller TCU determines whether the real-time throttle opening is greater than an and the throttle pressing time is greater than bn; if so, proceed to step S22.

[0097] If not, proceed to step S214;

[0098] S214. The transmission controller TCU determines whether the real-time throttle opening is greater than an-1 and the throttle pressing time is greater than bn-1;

[0099] If so, proceed to step S22;

[0100] If not, proceed to step S215;

[0101] S215. Repeat steps S213 and S214 until a1 and b1. The transmission controller TCU determines whether the real-time throttle opening is greater than a1 and the throttle pressing time is greater than b1.

[0102] If so, proceed to step S22;

[0103] If not, return to step S11;

[0104] S22. The transmission control unit (TCU) controls the start of the shifting process, and during the shifting process, it controls the clutch, engine, and AMT actuator to adjust engine speed, shift gears, and reduce torque; the specific steps of step S22 are as follows: S221. The transmission control unit (TCU) controls the start of the shifting process;

[0105] S222. The transmission control unit (TCU) enters the speed regulation stage, and controls the clutch to disengage to the calibrated threshold through the clutch solenoid valve to control the engine speed.

[0106] S223. The transmission controller TCU determines whether the engine speed has reached the requested speed and whether the difference between the engine speed and the input shaft speed is less than the first calibration threshold.

[0107] If so, proceed to step S224;

[0108] If not, wait for the set time period and return to step S223;

[0109] S224. The transmission controller TCU controls the gear shifting stage, controls the clutch position to the required position through the clutch solenoid valve, controls the engine speed to the required speed, and controls the transmission shift valve to operate.

[0110] S225. The transmission controller TCU determines whether the shift valve is in position and whether the difference between the engine speed and the input shaft speed is less than the second calibration threshold.

[0111] If so, proceed to step S226;

[0112] If not, wait for the set time period and return to step S225;

[0113] S226. The transmission controller controls the entry into the torque recovery stage, and controls the clutch engagement through the clutch solenoid valve to control the increase of engine torque;

[0114] S3. The transmission control unit (TCU) determines whether the shifting process is complete, and after the shifting process is complete, it returns engine control to the throttle. The specific steps of step S3 are as follows:

[0115] S31. The transmission control unit (TCU) determines whether the shifting process has been completed.

[0116] If so, proceed to step S32;

[0117] If not, wait for the set time period and return to step S31;

[0118] S32. The transmission control unit (TCU) returns engine control to the throttle.

[0119] It should be noted that in step S31, the transmission controller TCU determines whether the current gear is equal to the selected gear, whether the clutch is fully engaged, whether the requested engine torque is the same as the throttle torque, and the delay is set for a set time period; if so, it determines that the gear shift has been completed.

[0120] If not, the gear shift is not yet complete.

[0121] Example 3:

[0122] like Figure 3 As shown, this invention provides a control device for disengaging from coasting in neutral in a heavy commercial vehicle, comprising: an engine control takeover module, used to monitor the throttle status during coasting in neutral via the transmission controller (TCU), and to take over engine control when a throttle input signal is detected; the engine control takeover module includes:

[0123] Neutral coasting unit is used to determine that the vehicle is in neutral coasting control mode;

[0124] The accelerator pedal depressed signal detection unit is used to monitor the accelerator pedal status in real time through the transmission control unit (TCU) and determine whether there is an accelerator pedal depressed signal.

[0125] The engine control takeover unit is used to take over engine control via the transmission controller TCU when there is a throttle input signal.

[0126] The shift start module is used to identify the neutral gear exit request based on the accelerator pedal depressing depth and duration through the transmission controller TCU, and to start the shift process when the neutral gear exit request is identified; the shift start module includes: a neutral gear exit request identification unit, which is used to detect through the transmission controller TCU whether the accelerator pedal opening in the accelerator pedal depressing signal is greater than a set opening threshold and whether the accelerator pedal depressing time is greater than a set time threshold.

[0127] The shift initiation unit is used to initiate the shift process when the throttle opening exceeds a set threshold value and the throttle duration exceeds a set time threshold value, based on whether the throttle opening is greater than a set threshold value. During the shift process, it controls the clutch, engine, and AMT actuator to adjust engine speed, shift gears, and reduce torque. The engine control handover module is used to determine whether the shift process is complete via the TCU and, upon completion, hand over engine control to the throttle. The engine control handover module includes:

[0128] The shift completion judgment unit is used to determine whether the shift process has been completed through the transmission controller TCU; the engine control handover unit is used to hand over engine control to the throttle through the transmission controller TCU when the shift process is completed.

[0129] Example 4:

[0130] This invention provides a device, including a processor and a memory;

[0131] The memory is used to store computer programs, and the processor is used to call and run the computer programs from the memory, so that the device performs the method described in Embodiment 1 or Embodiment 2 above.

[0132] Example 5:

[0133] This invention provides a storage medium,

[0134] The storage medium stores instructions that, when run on a computer, cause the computer to execute the method described in Embodiment 1 or Embodiment 2 above.

[0135] Although the present invention has been described in detail with reference to the accompanying drawings and preferred embodiments, the invention is not limited thereto. Various equivalent modifications or substitutions can be made to the embodiments of the invention by those skilled in the art without departing from the spirit and essence of the invention, and such modifications or substitutions should all be within the scope of the invention. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the invention should also be covered within the protection scope of the invention. Therefore, the protection scope of the invention should be determined by the scope of the claims.

Claims

1. A control method for disengaging a heavy-duty commercial vehicle from coasting in neutral, characterized in that, The steps include the following: S1. The transmission control unit (TCU) monitors the throttle status during coasting in neutral and takes over engine control when it detects a throttle input signal. S2. The transmission control unit (TCU) identifies the request to exit neutral based on the depth and duration of the accelerator pedal being depressed, and initiates the shifting process upon detecting the request. S3. The transmission control unit (TCU) determines whether the shifting process has been completed, and after the shifting process is completed, it returns engine control to the throttle. The specific steps of step S1 are as follows: S11. The vehicle is in neutral coasting control mode; S12. The transmission control unit (TCU) monitors the throttle status in real time to determine whether there is a throttle input signal. If so, proceed to step S13; If not, return to step S11; S13. The transmission control unit (TCU) takes over engine control. The specific steps of step S2 are as follows: S21. The transmission controller (TCU) detects whether the throttle opening in the throttle depress signal is greater than the set opening threshold and whether the throttle depress time is greater than the set time threshold. If so, proceed to step S22; If not, return to step S11; S22. The transmission control unit (TCU) controls the start of the shifting process and controls the clutch, engine, and AMT actuator to adjust engine speed, shift gears, and reduce torque during the shifting process. The specific steps of step S21 are as follows: S211. Pre-set the time threshold for pressing the accelerator for each throttle opening; S212. Set the time threshold for throttle opening a1 as b1, the time threshold for throttle opening a2 as b3, ..., the time threshold for throttle opening an as bn, where a1 <a2…an-1<an,b1> b2…bn-1>bn; S213. The transmission controller TCU determines whether the real-time throttle opening is greater than an and the throttle pressing time is greater than bn; If so, proceed to step S22; If not, proceed to step S214; S214. The transmission controller TCU determines whether the real-time throttle opening is greater than an-1 and the throttle pressing time is greater than bn-1; If so, proceed to step S22; If not, proceed to step S215; S215. Repeat steps S213 and S214 until a1 and b1. The transmission controller TCU determines whether the real-time throttle opening is greater than a1 and the throttle pressing time is greater than b1. If so, proceed to step S22; If not, return to step S11.

2. The control method for exiting neutral coasting in a heavy commercial vehicle as described in claim 1, characterized in that, The specific steps of step S22 are as follows: S221. The transmission control unit (TCU) controls the start-up and shifting process; S222. The transmission control unit (TCU) enters the speed regulation stage, and controls the clutch to disengage to the calibrated threshold through the clutch solenoid valve to control the engine speed. S223. The transmission controller TCU determines whether the engine speed has reached the requested speed and whether the difference between the engine speed and the input shaft speed is less than the first calibration threshold. If so, proceed to step S224; If not, wait for the set time period and return to step S223; S224. The transmission controller TCU controls the gear shifting stage, controls the clutch position to the required position through the clutch solenoid valve, controls the engine speed to the required speed, and controls the transmission shift valve to operate. S225. The transmission controller TCU determines whether the shift valve is in position and whether the difference between the engine speed and the input shaft speed is less than the second calibration threshold. If so, proceed to step S226; If not, wait for the set time period and return to step S225; S226. The transmission controller controls the entry into the torque recovery stage, and controls the clutch engagement through the clutch solenoid valve to control the increase of engine torque.

3. The control method for exiting neutral coasting in a heavy commercial vehicle as described in claim 1, characterized in that, The specific steps of step S3 are as follows: S31. The transmission control unit (TCU) determines whether the shifting process has been completed. If so, proceed to step S32; If not, wait for the set time period and return to step S31; S32. The transmission control unit (TCU) returns engine control to the throttle.

4. The control method for exiting neutral coasting in a heavy commercial vehicle as described in claim 3, characterized in that, In step S31, the transmission controller TCU determines whether the current gear is equal to the selected gear, whether the clutch is fully engaged, whether the requested engine torque is the throttle torque, and sets a delay time. If so, the gear shift is considered complete; If not, the gear shift is not yet complete.

5. A control device for coasting out of neutral gear in a heavy-duty commercial vehicle, applicable to the control method for coasting out of neutral gear in a heavy-duty commercial vehicle as described in any one of claims 1-4, characterized in that, include: The engine control takeover module is used to monitor the throttle status during coasting in neutral via the transmission controller TCU, and take over engine control when a throttle input signal is detected. The shift start module is used to identify the request to exit neutral based on the depth and duration of the accelerator pedal being depressed through the transmission controller TCU, and to start the shift process when the request to exit neutral is identified; The engine control handover module is used to determine whether the gear shifting process has been completed through the transmission controller TCU, and to hand over engine control to the throttle after the gear shifting process is completed.

6. A device, characterized in that, Including processor and memory; The memory is used to store a computer program, and the processor is used to retrieve and run the computer program from the memory, causing the device to perform the method described in any one of claims 1-4.

7. A storage medium, characterized in that, The storage medium stores instructions that, when run on a computer, cause the computer to perform the method described in any one of claims 1-4.

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