CN116398306A - Load limiting rotating speed control method and system for tractor engine - Google Patents
Load limiting rotating speed control method and system for tractor engine Download PDFInfo
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- CN116398306A CN116398306A CN202310281964.7A CN202310281964A CN116398306A CN 116398306 A CN116398306 A CN 116398306A CN 202310281964 A CN202310281964 A CN 202310281964A CN 116398306 A CN116398306 A CN 116398306A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D31/00—Use of speed-sensing governors to control combustion engines, not otherwise provided for
- F02D31/001—Electric control of rotation speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0097—Electrical control of supply of combustible mixture or its constituents using means for generating speed signals
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0215—Introducing corrections for particular conditions exterior to the engine in relation with elements of the transmission
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
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Abstract
The invention discloses a load limiting rotating speed control method and a system of a tractor engine, which specifically comprise the following steps: s1, obtaining an engine load limiting rotating speed which is expected to be output according to the condition of activating gear switching; s2, obtaining the sum of the engine load rotating speed of the previous period and the engine load rotating speed difference value when the maximum accelerator pedal is activated; s3, comparing the sum with the expected output engine load limiting rotation speed, and taking the minimum value as the final output engine load limiting rotation speed.
Description
Technical Field
The invention belongs to the field of engine control, and particularly relates to a load limiting rotating speed control method and system of a tractor engine.
Background
In order to ensure that the output power of the engine of the tractor is sufficient, the rotation speed is stable, the engine has good economy, a proper engine load rotation speed limiting control method is required to be configured, and when the tractor carrying the mechanical hydraulic power split stepless speed changer is used for pulling a large-sized plough, the external load is changed severely due to the complexity of soil and terrain environment, so that the working point of the engine of the tractor frequently fluctuates, the rotation speed is unstable, and the oil consumption is higher. In the prior art, the working point of the engine is stable through matching between the engine and the load demand power, but the rotating speed control precision is lower, the stability is not high, the continuous speed ratio is unstable due to the severe load change of the mechanical hydraulic power split stepless speed changer, and the engine is subjected to alarm fault or damage due to frequent speed regulation, such as overlarge load, overload of the engine and the like.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a load limiting rotating speed control method and system for a tractor engine, which can maintain the stable operation of the engine under different working conditions, and has higher control precision and good economy.
In order to achieve the above purpose, the present invention provides the following technical solutions: a load limiting rotating speed control method of a tractor engine comprises the following specific steps:
s1, obtaining an engine load limiting rotating speed which is expected to be output according to the condition of activating gear switching;
s2, obtaining the sum of the engine load rotating speed of the previous period and the engine load rotating speed difference value when the maximum accelerator pedal is activated;
and S3, comparing the sum with the expected output engine load limiting rotation speed, and taking the minimum value as the final output engine load limiting rotation speed.
Further, in S1, when the gear shift is activated, taking the minimum value of the engine limit rotation speed after the gear shift and the actual engine rotation speed as the engine load limit rotation speed to be output;
when the gear shift is not activated, taking the engine load limiting rotation speed which is expected to be input as the engine load limiting rotation speed which is expected to be output;
specifically, when upshift is activated, subtracting an engine speed difference value used for judging gear shifting from an engine load limit speed before gear shifting to obtain an engine limit speed after gear shifting;
when the downshift is activated, the engine speed difference after the gear shift is judged to be multiplied by the sampling period and added with the engine load limiting speed before the gear shift to obtain the engine limiting speed after the gear shift.
Further, in S1, the desired input engine load limit rotation speed is obtained from the desired engine load limit rotation speed, the desired engine rotation speed, and the PTO control mode.
Further, when the PTO control mode is active: subtracting the maximum difference value of the expected engine speed in the PTO mode and the idle speed reduction value of the engine from the expected engine load limit speed value to obtain the expected input engine load limit speed;
when the PTO control mode is inactive:
1) Adding the difference value of the engine speed corresponding to the maximum engine torque and the engine load limiting speed corresponding to the reversing shuttle, comparing the difference value with the corresponding engine load limiting speed when the driving vehicle is started, and taking the minimum value;
2) Subtracting the one-dimensional linear piecewise function table lookup value of the engine speed corresponding to the actual vehicle speed from the minimum value to obtain a difference value;
3) And comparing the difference value with an expected engine load limiting rotation speed value, and taking the minimum value as the expected input engine load limiting rotation speed.
Further, the engine idle speed reduction is the engine minimum idle speed minus the minimum engine speed at idle.
Further, 1, obtaining an engine speed corresponding to a maximum engine torque under different driving modes:
1) When the driving mode is a road mode, dynamically looking up a one-dimensional linear piecewise function by using the expected engine speed to obtain an engine speed table value in the road mode, comparing the engine speed table value in the road mode with the engine speed corresponding to the maximum torque in the road mode, and taking the minimum value as the engine speed corresponding to the maximum engine torque;
2) When the driving mode is a non-road mode, dynamically looking up a one-dimensional linear piecewise function by using the expected engine speed to obtain an engine speed table value in the non-road mode, comparing the engine speed table value in the non-road mode with the engine speed corresponding to the maximum torque in the non-road mode, and taking the minimum value as the engine speed corresponding to the maximum engine torque;
2. obtaining an engine load limiting rotation speed difference value corresponding to the reversing shuttle under the condition of load delay time:
1) Carrying out one-dimensional linear piecewise function table lookup through the expected engine speed to obtain an engine speed difference value during reversing shuttle;
2) Multiplying the difference value by the load limiting rotating speed gradient to obtain an engine load limiting rotating speed difference value corresponding to reversing shuttle;
3. obtaining a corresponding engine load limiting rotation speed when starting the driving vehicle according to the vehicle speed:
when the vehicle speed is less than or equal to 3 km/h:
1) Subtracting the minimum idle speed of the engine from the engine speed corresponding to the maximum engine torque and subtracting the minimum engine speed drop value at idle to obtain a speed difference value;
2) Multiplying the rotating speed difference value by a one-dimensional linear piecewise function table lookup value of the actual vehicle speed to obtain an engine rotating speed value under a corresponding coefficient of the vehicle speed;
3) The sum of the engine speed value under the corresponding coefficient of the vehicle speed and the minimum engine speed drop value at the time of the minimum idle speed of the engine and the idle speed is used as the corresponding engine load limiting speed when the vehicle is started;
when the vehicle speed is greater than 3 km/h:
the engine speed corresponding to the maximum engine torque is set as the engine load limit speed corresponding to the start of the drive vehicle.
Further, in S1, a desired engine load limit rotation speed is obtained according to the driving mode, the engine failure flag bit, and the actual engine rotation speed;
when an engine fault zone bit is detected, a rotation speed parameter value selected by a currently activated driving mode and a difference value obtained by subtracting the minimum rotation speed of the engine load from the current actual engine rotation speed are taken as expected engine load limiting rotation speed values;
when no engine fault flag is detected, the desired engine load limit speed value is the speed parameter selected by the currently active driving mode;
the rotation speed parameter value selected by the currently activated driving mode is:
when the actual driving mode is a manual mode, the rotation speed parameter value selected by the currently activated driving mode is the maximum value of the engine load limiting rotation speed; when the actual driving mode is the automatic mode, the rotation speed parameter value selected by the currently activated driving mode is the engine load limit rotation speed maximum value.
Further, in S2, when the maximum accelerator pedal flag bit is detected, the engine load rotation speed difference is 10rpm; otherwise, the engine load speed difference is 0.
The invention provides a load limiting rotating speed control system of a tractor engine, comprising:
the engine load limiting rotation speed calculation module is used for obtaining the engine load limiting rotation speed of the expected output according to the condition of activating gear switching;
the engine load rotating speed difference value and calculating module is used for obtaining the sum of the engine load rotating speed of the previous period and the engine load rotating speed difference value when the maximum accelerator pedal is activated;
and the data comparison output module is used for comparing the sum obtained by the engine load rotating speed difference value and the calculation module with the expected output engine load limiting rotating speed, and outputting a minimum value, wherein the minimum value is the finally output engine load limiting rotating speed.
Further, the desired output engine load limit rotation speed calculation module includes:
the gear switching activating calculation module is used for taking the minimum value of the engine limiting rotation speed after gear switching and the actual engine rotation speed as the engine load limiting rotation speed which is expected to be output when gear switching is activated;
when the gear shift is not activated, taking the engine load limiting rotation speed which is expected to be input as the engine load limiting rotation speed which is expected to be output;
an expected input engine load limit rotation speed calculation module for obtaining an expected input engine load limit rotation speed according to the expected engine load limit rotation speed, the expected engine rotation speed and the PTO control mode;
and the expected engine load limiting rotation speed calculation module is used for obtaining the expected engine load limiting rotation speed according to the driving mode, the engine fault zone bit and the actual engine rotation speed.
Compared with the prior art, the invention has at least the following beneficial effects:
the invention provides a load limiting rotating speed control method of a tractor engine, which limits the actual speed ratio change through the finally output engine load limiting rotating speed, so that the speed ratio fluctuation of a mechanical hydraulic power splitting stepless gearbox is smaller when the tractor is severely changed due to the load, the speed ratio fluctuation is prevented from influencing the engine rotating speed, the engine is controlled to stably run in a short time, the engine working point is stable, the rotating speed control precision is high, and the reliability is high; the control method of the invention can be used for mechanical hydraulic stepless speed change tractors, can maintain the stable operation of the engine under different working conditions, and has the advantages of reduced oil consumption and good economical efficiency.
Drawings
FIG. 1 is a logic diagram of a load limiting speed control of a tractor engine;
Detailed Description
The invention is further described below with reference to the drawings and the detailed description.
In order to maintain the stable operation of the engine under different working conditions, a proper engine load and rotation speed limiting control method is required to be configured, so the invention provides a tractor engine load and rotation speed limiting control method. As shown in fig. 1, the engine load limit rotation speed control logic is divided into three major parts, namely, a desired engine load limit rotation speed control logic, a desired input engine load limit rotation speed control logic and a final output engine load limit rotation speed control logic.
(1) The desired engine load limits the speed control logic, which calculates the engine speed as the unloaded engine speed, as follows:
if the tractor engine is derated due to a fault (amber warning light) the engine is prevented from switching back to idle. When a fault occurs, the fault flag is set to 1, and the desired engine load limit speed is:
the rotation speed parameter value selected by the current activated driving mode, or the current actual engine rotation speed minus the engine load limit minimum rotation speed, obtains a difference value (the load limit minimum rotation speed is 20 rpm);
the minimum value of the two values is the expected engine load limiting rotation speed value;
otherwise, the desired engine load limit speed value is the speed parameter selected for the currently active driving mode.
Wherein, the rotation speed parameter value selected by the currently activated driving mode is:
when the actual driving mode is a manual mode, the rotation speed parameter value selected by the currently activated driving mode is the maximum value of the engine load limiting rotation speed and is 1400rpm; when the actual driving mode is the automatic mode, the rotation speed parameter value selected in the currently activated driving mode is the engine load limit rotation speed maximum value, which is 2310rpm.
(2) Desired input engine load limit speed control logic that generates a target value of engine load limit speed that is derived from a maximum engine torque curve and defines engine speed at full engine load, the specific control logic is as follows:
when the tractor PTO control mode is active, the desired input engine load limit speed is:
subtracting the maximum difference of the expected engine speed in the PTO mode and the idle speed reduction value of the engine from the expected engine load limit speed value obtained by the expected engine load limit speed control logic;
specifically, the engine idle speed reduction value is the engine minimum idle speed (750 rpm) minus the minimum engine speed at idle (30 rpm);
when the tractor PTO control mode is inactive, the desired input engine load limit speed is:
1) Adding the difference value of the engine speed corresponding to the maximum engine torque and the engine load limiting speed corresponding to the reversing shuttle, comparing the difference value with the corresponding engine load limiting speed when the driving vehicle is started, and taking the minimum value;
2) Subtracting the one-dimensional linear piecewise function table lookup value of the engine speed corresponding to the vehicle speed from the minimum value to obtain a difference value;
3) And comparing the difference value with an expected engine load limiting rotation speed value obtained through expected engine load limiting rotation speed control logic, and taking the minimum value as the expected input engine load limiting rotation speed.
The one-dimensional linear piecewise function of the engine speed corresponding to the actual vehicle speed is as follows:
| actual vehicle speed (km/h) | 0 | 50 |
| Rotating speed (rpm) | 0 | 400 |
( When the speed of the vehicle is between 0 and 50km/h, the vehicle and the rotating speed form a one-dimensional linear relation; when the speed of the vehicle is greater than 50km/h, the rotating speed is 400rpm fixed value )
The engine speed calculation logic corresponding to the maximum engine torque is as follows: 1) When the driving mode is the road mode, dynamically looking up a one-dimensional linear piecewise function through the expected engine speed to obtain an engine speed table value in the road mode, comparing the engine speed table value in the road mode with the engine speed (1820 rpm) corresponding to the maximum torque in the road mode, and taking the minimum value as the engine speed corresponding to the maximum engine torque;
2) When the driving mode is the non-road mode, the expected engine speed dynamic lookup one-dimensional linear piecewise function is used for obtaining an engine speed lookup value in the non-road mode, the engine speed lookup value in the non-road mode is compared with the engine speed (1900 rpm) corresponding to the maximum torque in the non-road mode, and the minimum value is the engine speed corresponding to the maximum engine torque.
Wherein the one-dimensional linear piecewise function is:
| desired engine speed (rpm) | 750 | 900 | 1000 | 1300 | 1600 | 2100 | 2250 |
| Engine speed (rpm) in mode | 720 | 850 | 950 | 1200 | 1500 | 1950 | 2100 |
( When the expected engine speed is 0-2100 rpm, the engine speed in the mode is 0-720 rpm, and a one-dimensional linear relation is formed; when the desired engine speed is greater than 2250rpm, the engine speed in mode is 2100rpm )
The engine load limit rotating speed difference value calculation logic corresponding to the reversing shuttle is as follows:
(because of the lower allowable engine speed, i.e., the maximum torque of the engine, the lower allowable engine speed drop results in a lower transmission ratio, and the allowable transmission ratio can be increased by controlling the engine load limit speed logic during the reverse shuttle.)
And carrying out one-dimensional linear piecewise function table lookup through the expected engine speed to obtain an engine speed difference value during reversing shuttle. And multiplying the difference value by a load limiting rotating speed gradient (0.005) to obtain an engine load limiting rotating speed difference value corresponding to the reversing shuttle, wherein the duration time is determined by a load delay time (1 s). Wherein the one-dimensional linear piecewise function is:
| desired engine speed (rpm) | 1000 | 1400 | 1900 | 2000 |
| Engine speed difference (rpm) during reversing shuttle | -50 | -100 | -100 | -50 |
(Engine speed difference at reverse shuttle when the desired engine speed is between 0 and 1000 rpm-50 fixed value, and engine speed difference at reverse shuttle when the desired engine speed is greater than 2000 rpm-50 fixed value)
The corresponding engine load limiting rotation speed calculation logic when the driving vehicle is started is as follows:
(by setting the proportional coefficient of the vehicle speed, the engine load limit speed can be reduced, which is beneficial to helping to start the vehicle and eliminate the influence of the engine speed reduction.)
When the vehicle speed is less than or equal to 3km/h, 1) subtracting the minimum idle speed (750 rpm) of the engine from the engine speed corresponding to the maximum engine torque and subtracting the minimum engine speed drop (30 rpm) at idle to obtain a speed difference;
2) Multiplying the rotation speed difference value by a one-dimensional linear piecewise function table lookup value of the vehicle speed to obtain an engine rotation speed value under a corresponding coefficient of the vehicle speed;
3) The sum of the engine speed value at the vehicle speed corresponding coefficient and the minimum engine speed drop value at the time of idling and the minimum engine idle speed is used as the corresponding engine load limit speed at the time of starting the vehicle.
When the vehicle speed is greater than 3km/h, the engine speed corresponding to the maximum engine torque is directly used as the corresponding engine load limiting speed when the vehicle is started to drive, and the one-dimensional linear piecewise function is as follows:
| actual vehicle speed (km/h) | 0 | 3 |
| Corresponding coefficient of vehicle speed | 0 | 1 |
(when the actual vehicle speed is greater than 3km/h, the vehicle speed corresponding coefficient is a constant value of 1)
(3) The final output engine load limit speed control logic is:
obtaining the sum of the engine load rotating speed of the previous period and the engine load rotating speed difference value when the maximum accelerator pedal is activated, comparing the sum with the expected output engine load limiting rotating speed, and taking the minimum value as the final output engine load limiting rotating speed:
the engine load rotating speed difference value control logic when the maximum accelerator pedal is activated is as follows:
when the maximum accelerator pedal flag bit is detected (namely the accelerator pedal is fully depressed), the engine load speed difference is 10rpm; otherwise, the engine load speed difference is 0. For adjusting the rate of rise of the engine load limit rotational speed.
Wherein the desired output engine load limit speed control logic is:
when gear shift is activated (gear here refers to mechanical gear), the desired output engine load limit rotation speed is the minimum value of the engine limit rotation speed after gear shift and the actual engine rotation speed;
otherwise (i.e., the mechanical gear shift is inactive, the current mechanical gear is held unchanged), the desired output engine load limit speed is the desired input engine load limit speed.
The engine limiting rotation speed control logic after gear switching is as follows:
(control logic always causes the engine speed to be above the load limiting speed of the engine, i.e., the engine speed is greater than or equal to the engine load limiting speed)
If the upshift is activated, subtracting 100rpm of an engine speed difference value used for judging the gear shifting from the engine load limiting speed before gear shifting so as to obtain the engine limiting speed after gear shifting;
if the downshift is activated, the engine speed limit after the shift is obtained by adding the value of the engine speed difference 400rpm multiplied by the sampling period 0.01s after the shift to the engine load speed limit before the shift.
Implementation case:
when the driver starts the tractor with the mechanical hydraulic power split continuously variable transmission, the actual driving mode defaults to the automatic mode. The working condition in the scheme is that the field PTO works in a control mode. If the tractor works in the field working condition, when the amber warning light of the engine instrument panel is on, the fault flag position in the software model is 1, the expected engine load limiting rotation speed is the minimum value of two values of the maximum value 2310rpm of the engine load limiting rotation speed in the automatic mode and the current actual engine rotation speed minus the minimum rotation speed 20rpm of the engine load limiting rotation speed, and the expected engine load limiting rotation speed calculated here is the rotation speed of the engine under no load.
The desired input engine load limit speed is further calculated and the PTO control mode is used if the tractor is operating in field conditions. The desired engine load limit speed value obtained by the desired engine load limit speed control logic minus the desired engine speed maximum difference in PTO mode of 150rpm and the engine idle speed reduction of 720rpm.
The sum of the engine load rotating speed of the previous period and the engine load rotating speed difference when the maximum accelerator pedal is activated is further obtained, namely when the maximum accelerator pedal zone bit is detected, the engine load rotating speed difference is 10rpm, the sum is compared with the engine load limiting rotating speed expected to be output, when gear switching is activated, the engine load limiting rotating speed expected to be output is the minimum value of the engine limiting rotating speed after gear switching and the actual engine rotating speed, and the minimum value of the two compared values is the engine load limiting rotating speed finally output.
And the rotation speed is limited by the finally output engine load, so that the engine rotation speed is controlled to stably run in a field PTO mode, and the control precision is high and the economy is good.
Claims (10)
1. A load limiting rotating speed control method of a tractor engine is characterized by comprising the following specific steps:
s1, obtaining an engine load limiting rotating speed which is expected to be output according to the condition of activating gear switching;
s2, obtaining the sum of the engine load rotating speed of the previous period and the engine load rotating speed difference value when the maximum accelerator pedal is activated;
and S3, comparing the sum with the expected output engine load limiting rotation speed, and taking the minimum value as the final output engine load limiting rotation speed.
2. The method according to claim 1, wherein in S1, when the gear shift is activated, the minimum value of the engine speed limit after the gear shift and the actual engine speed is taken as the engine speed limit to be output;
when the gear shift is not activated, taking the engine load limiting rotation speed which is expected to be input as the engine load limiting rotation speed which is expected to be output;
specifically, when upshift is activated, subtracting an engine speed difference value used for judging gear shifting from an engine load limit speed before gear shifting to obtain an engine limit speed after gear shifting;
when the downshift is activated, the engine speed difference after the gear shift is judged to be multiplied by the sampling period and added with the engine load limiting speed before the gear shift to obtain the engine limiting speed after the gear shift.
3. The method according to claim 2, wherein in S1, the desired input engine load limiting rotation speed is obtained based on the desired engine load limiting rotation speed, the desired engine rotation speed, and the PTO control mode.
4. A method for controlling a load limiting rotational speed of a tractor engine according to claim 3,
when the PTO control mode is active:
subtracting the maximum difference value of the expected engine speed in the PTO mode and the idle speed reduction value of the engine from the expected engine load limit speed value to obtain the expected input engine load limit speed;
when the PTO control mode is inactive:
1) Adding the difference value of the engine speed corresponding to the maximum engine torque and the engine load limiting speed corresponding to the reversing shuttle, comparing the difference value with the corresponding engine load limiting speed when the driving vehicle is started, and taking the minimum value;
2) Subtracting the one-dimensional linear piecewise function table lookup value of the engine speed corresponding to the actual vehicle speed from the minimum value to obtain a difference value;
3) And comparing the difference value with an expected engine load limiting rotation speed value, and taking the minimum value as the expected input engine load limiting rotation speed.
5. The method of controlling a load limiting rotational speed of a tractor engine according to claim 4, wherein the engine idle speed reduction is an engine minimum idle speed minus a minimum engine speed at idle.
6. A method for controlling a load limiting rotational speed of a tractor engine according to claim 4,
1. obtaining engine speeds corresponding to maximum engine torques under different driving modes:
1) When the driving mode is a road mode, dynamically looking up a one-dimensional linear piecewise function by using the expected engine speed to obtain an engine speed table value in the road mode, comparing the engine speed table value in the road mode with the engine speed corresponding to the maximum torque in the road mode, and taking the minimum value as the engine speed corresponding to the maximum engine torque;
2) When the driving mode is a non-road mode, dynamically looking up a one-dimensional linear piecewise function by using the expected engine speed to obtain an engine speed table value in the non-road mode, comparing the engine speed table value in the non-road mode with the engine speed corresponding to the maximum torque in the non-road mode, and taking the minimum value as the engine speed corresponding to the maximum engine torque;
2. obtaining an engine load limiting rotation speed difference value corresponding to the reversing shuttle under the condition of load delay time:
1) Carrying out one-dimensional linear piecewise function table lookup through the expected engine speed to obtain an engine speed difference value during reversing shuttle;
2) Multiplying the difference value by the load limiting rotating speed gradient to obtain an engine load limiting rotating speed difference value corresponding to reversing shuttle;
3. obtaining a corresponding engine load limiting rotation speed when starting the driving vehicle according to the vehicle speed:
when the vehicle speed is less than or equal to 3 km/h:
1) Subtracting the minimum idle speed of the engine from the engine speed corresponding to the maximum engine torque and subtracting the minimum engine speed drop value at idle to obtain a speed difference value;
2) Multiplying the rotating speed difference value by a one-dimensional linear piecewise function table lookup value of the actual vehicle speed to obtain an engine rotating speed value under a corresponding coefficient of the vehicle speed;
3) The sum of the engine speed value under the corresponding coefficient of the vehicle speed and the minimum engine speed drop value at the time of the minimum idle speed of the engine and the idle speed is used as the corresponding engine load limiting speed when the vehicle is started;
when the vehicle speed is greater than 3 km/h:
the engine speed corresponding to the maximum engine torque is set as the engine load limit speed corresponding to the start of the drive vehicle.
7. The method according to any one of claims 3 to 6, wherein in S1, a desired engine load limit rotation speed is obtained from a driving mode, an engine failure flag, and an actual engine rotation speed;
when an engine fault zone bit is detected, a rotation speed parameter value selected by a currently activated driving mode and a difference value obtained by subtracting the minimum rotation speed of the engine load from the current actual engine rotation speed are taken as expected engine load limiting rotation speed values;
when no engine fault flag is detected, the desired engine load limit speed value is the speed parameter selected by the currently active driving mode;
the rotation speed parameter value selected by the currently activated driving mode is:
when the actual driving mode is a manual mode, the rotation speed parameter value selected by the currently activated driving mode is the maximum value of the engine load limiting rotation speed; when the actual driving mode is the automatic mode, the rotation speed parameter value selected by the currently activated driving mode is the engine load limit rotation speed maximum value.
8. The method according to claim 1, wherein in S2, when the maximum accelerator pedal flag is detected, the engine load rotation speed difference is 10rpm; otherwise, the engine load speed difference is 0.
9. A load limiting rotational speed control system for a tractor engine, comprising:
the engine load limiting rotation speed calculation module is used for obtaining the engine load limiting rotation speed of the expected output according to the condition of activating gear switching;
the engine load rotating speed difference value and calculating module is used for obtaining the sum of the engine load rotating speed of the previous period and the engine load rotating speed difference value when the maximum accelerator pedal is activated;
and the data comparison output module is used for comparing the sum obtained by the engine load rotating speed difference value and the calculation module with the expected output engine load limiting rotating speed, and outputting a minimum value, wherein the minimum value is the finally output engine load limiting rotating speed.
10. The system of claim 9, wherein the desired output engine load limiting speed calculation module comprises:
the gear switching activating calculation module is used for taking the minimum value of the engine limiting rotation speed after gear switching and the actual engine rotation speed as the engine load limiting rotation speed which is expected to be output when gear switching is activated;
when the gear shift is not activated, taking the engine load limiting rotation speed which is expected to be input as the engine load limiting rotation speed which is expected to be output;
an expected input engine load limit rotation speed calculation module for obtaining an expected input engine load limit rotation speed according to the expected engine load limit rotation speed, the expected engine rotation speed and the PTO control mode;
and the expected engine load limiting rotation speed calculation module is used for obtaining the expected engine load limiting rotation speed according to the driving mode, the engine fault zone bit and the actual engine rotation speed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310281964.7A CN116398306A (en) | 2023-03-21 | 2023-03-21 | Load limiting rotating speed control method and system for tractor engine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310281964.7A CN116398306A (en) | 2023-03-21 | 2023-03-21 | Load limiting rotating speed control method and system for tractor engine |
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| CN116398306A true CN116398306A (en) | 2023-07-07 |
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| CN202310281964.7A Pending CN116398306A (en) | 2023-03-21 | 2023-03-21 | Load limiting rotating speed control method and system for tractor engine |
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- 2023-03-21 CN CN202310281964.7A patent/CN116398306A/en active Pending
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