Starting control method for 8AMT commercial vehicle

Abstract

The invention discloses a starting control method for an 8AMT commercial vehicle, and relates to the technical field of commercial vehicles, and the starting control method comprises the following steps: when the vehicle is started, obtaining the current total mass of the vehicle, obtaining the current road slope value, and obtaining the continuous flameout duration before the vehicle is started; if the duration of continuous flameout before the vehicle is started exceeds a first preset duration, before the current total mass of the vehicle is obtained and the vehicle is in the D gear, the TCU controls the starting gear of the vehicle according to the current road slope value; and after the current total mass of the vehicle is obtained, the TCU controls the starting gear of the vehicle according to the current total mass of the vehicle and the current road slope value. Meanwhile, gears of a clutch and a transmission are protected, the reliability of the vehicle is guaranteed, and stable and smooth starting can be achieved. And meanwhile, the intelligent degree of the 8AMT commercial vehicle is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of commercial vehicles, and in particular to a starting control method for an 8AMT commercial vehicle. Background Art

[0002] Currently, 8AMT commercial vehicles do not have intelligent gear starting selection. Instead, the starting gear is controlled by adding a 1 / 2 gear selection on the electronic shifter. For different vehicle loads and slope values, the appropriate gear cannot be reasonably selected for starting, which affects the life of the clutch and may cause gear knocking. Summary of the invention

[0003] The present application provides a starting control method for an 8AMT commercial vehicle to at least solve one technical problem existing in the related art.

[0004] The starting control method of the 8AMT commercial vehicle includes: when the vehicle starts, obtaining the current vehicle gross mass, obtaining the current road slope value, and obtaining the continuous flameout duration before the vehicle starts; if the continuous flameout duration before the vehicle starts exceeds a first preset duration, before obtaining the current vehicle gross mass and when the vehicle is in gear D, the TCU controls the vehicle's starting gear according to the current road slope value; after obtaining the current vehicle gross mass, the TCU controls the vehicle's starting gear according to the current vehicle gross mass and the current road slope value.

[0005] As an optional implementation, if the duration of continuous engine shutdown before the vehicle starts is less than the first preset duration, the TCU controls the vehicle to travel at the starting gear of the vehicle before the last engine shutdown.

[0006] As an optional implementation, it also includes: if the continuous shutdown duration before the vehicle starts is less than the first preset duration, determining whether the difference between the current vehicle gross mass and the vehicle gross mass before the vehicle was last shut down is greater than the preset mass difference; if the difference between the current vehicle gross mass and the vehicle gross mass before the vehicle was last shut down is greater than the preset mass difference, the TCU determines the starting gear of the vehicle according to the current vehicle gross mass and the current road slope value.

[0007] As an optional implementation, it also includes: if the difference between the current total vehicle mass and the total vehicle mass before the vehicle was last shut down is less than a preset mass difference, the TCU controls the vehicle to travel in the starting gear of the vehicle before the vehicle was last shut down.

[0008] As an optional implementation, if the continuous shutdown duration before the vehicle starts exceeds a first preset duration, before the current total vehicle mass is obtained, and the vehicle's starting gear is in D gear, the TCU controls the vehicle's starting gear according to the current road slope value, including: determining whether the current road slope value is greater than the first preset slope value; if the current road slope value is greater than the first preset slope value, the TCU controls the vehicle to start in 1st gear.

[0009] As an optional implementation, if the continuous shutdown duration before the vehicle starts exceeds a first preset duration, before the current total vehicle mass is obtained, and the vehicle's starting gear is in D gear, the TCU controls the vehicle's starting gear according to the current road slope value, and also includes: if the current road slope value is less than the first preset slope value, the TCU controls the vehicle to start in 2nd gear.

[0010] As an optional implementation, it also includes: if a manual shift signal is obtained when the TCU controls the starting gear of the vehicle, the starting gear of the vehicle is controlled according to the manual shift signal.

[0011] As an optional implementation, it also includes: if the current road slope value is greater than a second preset slope value, the EPB automatically switches to vehicle control.

[0012] As an optional implementation, if the current road slope value is greater than a second preset slope value, the EPB automatically engages in vehicle control, including: when the vehicle speed signal and the output shaft speed signal are both 0 and the throttle opening is ≥5%, the TCU sends a release command to the EPB, the EPB controls the brake to lock the motor, the TCU controls the clutch slip, and controls the engine to increase torque.

[0013] In an embodiment of the present application, a starting control method for an 8AMT commercial vehicle is provided, including: when the vehicle starts, obtaining the current vehicle gross mass, obtaining the current road slope value, and obtaining the continuous flameout time before the vehicle starts; if the continuous flameout time before the vehicle starts exceeds the first preset time, before obtaining the current vehicle gross mass and when the vehicle is in gear D, the TCU controls the starting gear of the vehicle according to the current road slope value; after obtaining the current vehicle gross mass, the TCU controls the starting gear of the vehicle according to the current vehicle gross mass and the current road slope value. For commercial vehicles, due to the large load change, when the vehicle is unloaded, if the first gear is used to start, the vehicle starts too slowly; if the gear with a relatively small speed is used to start at a high gear, it is easy to damage the clutch. Therefore, it is very important to reasonably select the starting gear according to different loads and slopes. 8AMT commercial vehicles have many gears, and a reasonable starting gear will give full play to the power of the vehicle, protect the clutch and the gears of the transmission, ensure the reliability of the vehicle, and achieve a smooth and smooth start. At the same time, the intelligence level of 8AMT commercial vehicles is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0016] Figure 1 It is a schematic flow chart of a starting control method for an 8AMT commercial vehicle provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0017] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0018] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0019] like Figure 1 As shown, the embodiment of the present application provides a starting control method for an 8AMT commercial vehicle, comprising:

[0020] S1 obtains the current vehicle gross mass, the current road slope value, and the duration of continuous engine shutdown before the vehicle starts when the vehicle starts;

[0021] S2: If the continuous shutdown time before the vehicle starts exceeds a first preset time, before the current vehicle gross mass is obtained and the vehicle is in gear D, the TCU controls the starting gear of the vehicle according to the current road slope value;

[0022] S3 After acquiring the current gross vehicle mass, the TCU controls the starting gear of the vehicle according to the current gross vehicle mass and the current road slope value.

[0023] For commercial vehicles, due to the large load changes, when the vehicle is unloaded, if it starts in the first gear, the vehicle will start too slowly; if it starts in a relatively slow gear at a high gear, it is easy to damage the clutch. Therefore, it is very important to choose the starting gear reasonably according to different loads and slopes. 8AMT commercial vehicles have many gears. A reasonable starting gear will give full play to the power of the vehicle, protect the clutch and the gears of the transmission, ensure the reliability of the vehicle, and achieve a smooth start. At the same time, the intelligence level of 8AMT commercial vehicles is improved.

[0024] Specifically, it is easy to understand that it takes a certain amount of time to confirm the total weight of the vehicle. Therefore, before obtaining the current total mass of the vehicle and when the vehicle is in D gear, the TCU controls the starting gear of the vehicle according to the current road slope value. After obtaining the current total mass of the vehicle, the TCU controls the starting gear of the vehicle according to the current total mass of the vehicle and the current road slope value.

[0025] In addition, the first preset time can be determined according to vehicle usage habits, loading conditions, etc. For example, if the vehicle fully loaded with goods takes about half an hour to unload, the first preset time can be determined as half an hour. If the shutdown time exceeds half an hour, it can be considered that the vehicle is shut down for unloading, and the total vehicle mass will change significantly. Therefore, before obtaining the current total vehicle mass and when the vehicle is in gear D, the TCU controls the starting gear of the vehicle according to the current road slope value. After obtaining the current total vehicle mass, the TCU controls the starting gear of the vehicle according to the current total vehicle mass and the current road slope value. This is equivalent to starting again according to the vehicle working conditions.

[0026] In addition, the specific implementation method of the TCU controlling the starting gear of the vehicle according to the current total vehicle mass and the current road slope value can be determined according to Table 1: Slope, load and starting gear relationship table. The Table 1 can be calibrated when the vehicle leaves the factory, and this application does not limit this.

[0027] Table 1: Relationship between slope, load and starting gear

[0028]

[0029] As an optional implementation, if the duration of continuous engine shutdown before the vehicle starts is less than the first preset duration, the TCU controls the vehicle to travel at the starting gear of the vehicle before the last engine shutdown.

[0030] Specifically, if the vehicle is turned off and started again within the first preset time, that is, the duration of the engine being turned off before starting is less than the first preset time, then the vehicle is most likely not unloading. At this time, it can be first assumed that the total mass of the vehicle has not changed, so the vehicle is started directly with the starting gear at the previous start.

[0031] As an optional implementation, it also includes: if the continuous shutdown duration before the vehicle starts is less than the first preset duration, determining whether the difference between the current vehicle gross mass and the vehicle gross mass before the vehicle was last shut down is greater than the preset mass difference; if the difference between the current vehicle gross mass and the vehicle gross mass before the vehicle was last shut down is greater than the preset mass difference, the TCU determines the starting gear of the vehicle according to the current vehicle gross mass and the current road slope value.

[0032] Specifically, it can be understood that if the vehicle is shut down and started again within the first preset time period, it may also be that a part of the cargo has been unloaded. Therefore, the total mass of the vehicle may also change significantly. Therefore, it is also possible to determine whether the difference between the current total mass of the vehicle and the total mass of the vehicle before the vehicle was last shut down is greater than the preset mass difference; if the difference between the current total mass of the vehicle and the total mass of the vehicle before the vehicle was last shut down is greater than the preset mass difference, the TCU determines the starting gear of the vehicle according to the current total mass of the vehicle and the current road slope value.

[0033] As an optional implementation, it also includes: if the difference between the current total vehicle mass and the total vehicle mass before the vehicle was last shut down is less than a preset mass difference, the TCU controls the vehicle to travel in the starting gear of the vehicle before the vehicle was last shut down.

[0034] As an optional implementation, if the continuous shutdown duration before the vehicle starts exceeds a first preset duration, before the current total vehicle mass is obtained, and the vehicle's starting gear is in D gear, the TCU controls the vehicle's starting gear according to the current road slope value, including: determining whether the current road slope value is greater than the first preset slope value; if the current road slope value is greater than the first preset slope value, the TCU controls the vehicle to start in 1st gear.

[0035] Specifically, the first preset slope value can be determined according to the working condition of the vehicle, for example, it can be set to 10°. At the same time, the slope value can be set to positive and negative values. For example, if the front of the vehicle is uphill, then the slope value of the vehicle at this time can be considered to be positive, and if the front of the vehicle is downhill, then the slope value of the vehicle at this time can be considered to be negative. When the current road slope value is greater than 10°, that is, the vehicle starts uphill, so it starts in first gear.

[0036] As an optional implementation, if the continuous shutdown duration before the vehicle starts exceeds a first preset duration, before the current total vehicle mass is obtained, and the vehicle's starting gear is in D gear, the TCU controls the vehicle's starting gear according to the current road slope value, and also includes: if the current road slope value is less than the first preset slope value, the TCU controls the vehicle to start in 2nd gear.

[0037] If the current road slope value is less than the first preset slope value, the vehicle starts in 2nd gear.

[0038] As an optional implementation, it also includes: if a manual shift signal is obtained when the TCU controls the starting gear of the vehicle, the starting gear of the vehicle is controlled according to the manual shift signal.

[0039] As an optional implementation, it also includes: if the current road slope value is greater than a second preset slope value, the EPB automatically switches to vehicle control.

[0040] As an optional implementation, if the current road slope value is greater than a second preset slope value, the EPB automatically engages in vehicle control, including: when the vehicle speed signal and the output shaft speed signal are both 0 and the throttle opening is ≥5%, the TCU sends a release command to the EPB, the EPB controls the brake to lock the motor, the TCU controls the clutch slip, and controls the engine to increase torque.

[0041] The present application is a control system based on CAN control for 8AMT commercial vehicles based on intelligent starting gear selection, including an automatic transmission control system TCU; a shift handle SCU, an engine ECU, an accelerator pedal, a brake pedal, a clutch, an instrument cluster assembly IC, an EPB electronic control unit, ABS and other components.

[0042] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0043] If the integrated units in the above embodiments are implemented in the form of software functional units and sold or used as independent products, they can be stored in the above computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for enabling one or more electronic devices (such as personal computers, servers, or network devices) to perform all or part of the steps of the methods described in the various embodiments of the present application.

[0044] In the above embodiments of the present application, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0045] In the several embodiments provided in the present application, it should be understood that the disclosed client can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0046] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution provided in this embodiment.

[0047] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0048] In the above embodiments of the present application, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0049] The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A starting control method for an 8AMT commercial vehicle, characterized in that: include: When the vehicle starts, obtain the current total vehicle mass, the current road slope value, and the duration of continuous shutdown before the vehicle starts; If the continuous shutdown time before the vehicle starts exceeds a first preset time, before the current vehicle gross mass is obtained and the vehicle is in gear D, the TCU controls the starting gear of the vehicle according to the current road slope value; After acquiring the current gross vehicle mass, the TCU controls the starting gear of the vehicle according to the current gross vehicle mass and the current road slope value.

2. The starting control method of the 8AMT commercial vehicle according to claim 1, characterized in that: Also includes: If the duration of continuous engine-off before the vehicle starts is less than the first preset duration, the TCU controls the vehicle to run at the starting gear of the vehicle before the last engine-off.

3. The starting control method of an 8AMT commercial vehicle according to any one of claims 1 to 2, characterized in that: Also includes: If the continuous shutdown time before the vehicle starts is less than the first preset time, determining whether the difference between the current vehicle gross mass and the vehicle gross mass before the vehicle was last shut down is greater than a preset mass difference; If the difference between the current vehicle gross mass and the vehicle gross mass before the vehicle was last shut down is greater than a preset mass difference, the TCU determines the vehicle's starting gear according to the current vehicle gross mass and the current road slope value.

4. The starting control method of the 8AMT commercial vehicle according to claim 3, characterized in that: Also includes: If the difference between the current vehicle gross mass and the vehicle gross mass before the vehicle was last turned off is less than the preset mass difference, the TCU controls the vehicle to travel at the starting gear of the vehicle before the vehicle was last turned off.

5. The starting control method of the 8AMT commercial vehicle according to claim 1, characterized in that: If the continuous shutdown time before the vehicle starts exceeds the first preset time, before the current vehicle gross mass is obtained, and the starting gear of the vehicle is in the D gear, the TCU controls the starting gear of the vehicle according to the current road slope value, including: Determining whether the current road slope value is greater than a first preset slope value; If the current road slope value is greater than the first preset slope value, the TCU controls the vehicle to start in first gear.

6. The starting control method of the 8AMT commercial vehicle according to claim 5, characterized in that: If the continuous shutdown time before the vehicle starts exceeds the first preset time, before the current vehicle gross mass is obtained, and the starting gear of the vehicle is in gear D, the TCU controls the starting gear of the vehicle according to the current road slope value, and further includes: If the current road slope value is less than the first preset slope value, the TCU controls the vehicle to start in 2nd gear.

7. The starting control method of the 8AMT commercial vehicle according to claim 1, characterized in that: Also includes: If a manual shift signal is obtained when the TCU controls the starting gear of the vehicle, the starting gear of the vehicle is controlled according to the manual shift signal.

8. The starting control method of the 8AMT commercial vehicle according to claim 1, characterized in that: Also includes: If the current road slope value is greater than a second preset slope value, the EPB automatically switches to vehicle control.

9. The starting control method of an 8AMT commercial vehicle according to claim 8, characterized in that: If the current road slope value is greater than a second preset slope value, the EPB automatically switches to vehicle control including: When the vehicle speed signal and the output shaft speed signal are both 0 and the throttle opening is ≥5%, the TCU sends a release command to the EPB, the EPB controls the brake to lock the motor, the TCU controls the clutch to slip, and controls the engine to increase the torque.

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