CN112761802B - Sudden unloading speed regulating method for diesel engine - Google Patents
Sudden unloading speed regulating method for diesel engine Download PDFInfo
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- CN112761802B CN112761802B CN202110200552.7A CN202110200552A CN112761802B CN 112761802 B CN112761802 B CN 112761802B CN 202110200552 A CN202110200552 A CN 202110200552A CN 112761802 B CN112761802 B CN 112761802B
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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
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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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- 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
- F02D41/30—Controlling fuel injection
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Abstract
The invention discloses a sudden unloading speed regulating method of a diesel engine, which comprises the following steps: step 1: initializing a sudden unloading speed regulation function of the diesel engine; step 2: the ECU monitors the real-time rotating speed of the diesel engine, judges whether the diesel engine has sudden unloading action or not according to the real-time rotating speed of the diesel engine, if so, executes the step 3, and if not, continues to monitor the real-time rotating speed of the diesel engine; and step 3: the ECU sends a fuel cut-off request to the fuel quantity calculation module, and when the fuel cut-off condition is met, the fuel quantity calculation module sets the fuel injection quantity to be 0 and executes the fuel cut-off action on the diesel engine; and 4, step 4: the ECU finishes the oil cut-off action and recovers the oil quantity; and 5: and (3) starting timing of fuel cut-off release by the ECU, and returning to the step (2) after timing is finished. The invention can monitor and judge the sudden unloading action of the diesel engine through the rotating speed of the diesel engine, trigger the fuel cut-off action instruction and reduce the frequency overshoot of the diesel engine through the fuel cut-off so as to achieve the effect of rapid and direct speed regulation.
Description
Technical Field
The invention relates to a control method of a diesel engine, in particular to a sudden unloading speed regulation method of the diesel engine.
Background
The diesel engine is a common device used for generating electricity and providing power, and the sudden loading and unloading characteristic is one of important performance indexes of the diesel engine, wherein the sudden unloading is a performance index for testing the transient frequency adjustment rate and the transient frequency adjustment stabilization time. The sudden unloading action of the diesel engine means that the external load equipment is suddenly unloaded (closed), the diesel engine cannot immediately respond when the external load equipment is suddenly unloaded, the output power of the diesel engine is instantly changed from a higher value (such as 100 KW) to a lower value (such as 0 KW), the rotating speed of the diesel engine suddenly overshoots at the moment, the output frequency of the diesel engine exceeds an index, and the output frequency overshoot percentage of the existing diesel engine is 5-7% according to the requirement of the national standard GB/T2820-2009. In the process of instantaneous reduction of the output power of the diesel engine, the output torque of the diesel engine loses balance, and the operation stability of the diesel engine needs to be kept through rotation speed regulation.
The prior art comprises the following steps: the oil supply parameter adjustment is realized based on a PID technology (PID means a PID controller which is controlled according to the proportion (P), the integral (I) and the differential (D) of the deviation in the process control, and is an automatic controller which is most widely applied), so that the rotation speed adjustment of the diesel engine is realized. However, the PID technology has a main function of ensuring the stable rotation speed of the diesel engine, and cannot ensure the stable rotation speed of the diesel engine quickly, directly and effectively under the condition of sudden unloading.
The Chinese patent application CN 202010758261.5 discloses a control method and a system for quick response of sudden-adding and sudden-unloading of an electric control generator, wherein the control method comprises the steps of firstly respectively calculating a target rotating speed difference and a change difference of the rotating speed of the engine according to the actual rotating speed of the engine and the target rotating speed of the engine, then judging the running state of the engine according to the absolute value of the target rotating speed difference of the engine and a steady transient judgment rotating speed value, and then calculating the increment of an accelerator according to the target rotating speed difference of the engine, the change difference of the rotating speed of the engine and the running state of the engine; and finally, calculating actual fuel injection quantity according to the opening of the accelerator and the accelerator increment in the previous period to control the output of the fuel injection quantity of the fuel injector, so that the rotating speed of the engine is regulated by utilizing the output of the fuel injection quantity. The control method needs to combine the rotating speed, the time and the accelerator opening, confirms the fuel injection quantity through external characteristic comparison, and adjusts the fuel injection quantity by integrating PID, and has the advantages of multiple acquisition parameters, complex calculation process, slow and indirect rotating speed adjusting response and often incapability of achieving the expected adjusting effect.
Disclosure of Invention
The invention aims to provide a sudden unloading speed regulating method of a diesel engine, which can monitor and judge the sudden unloading working condition of the diesel engine through the rotating speed of the diesel engine, trigger an oil-cut action instruction and reduce the frequency overshoot of the diesel engine through oil cut so as to achieve the effect of rapid and direct speed regulation.
The invention is realized in the following way:
a sudden unloading speed regulation method of a diesel engine comprises the following steps:
step 1: initializing a sudden unloading speed regulation function of the diesel engine;
and 2, step: the ECU monitors the real-time rotating speed of the diesel engine, judges whether the diesel engine has sudden unloading action or not according to the real-time rotating speed of the diesel engine, if so, executes the step 3, and if not, continues to monitor the real-time rotating speed of the diesel engine;
step 2.1: the ECU calculates the updating time t of the rotating speed of the diesel engine according to the constant rotating speed A, and the calculation formula is as follows:
t=60*1000/（A*N C ）；
wherein N is C The number of cylinders of the diesel engine;
step 2.2: the ECU calculates the real-time updating time T of the rotating speed of the diesel engine according to the real-time rotating speed of the diesel engine, and the calculation formula is as follows:
T=60*1000/（S E *N C ）；
wherein S is E The real-time rotating speed of the diesel engine;
step 2.3: the ECU screens the real-time rotating speed of the diesel engine according to the updating time T and the real-time updating time T of the rotating speed of the diesel engine to obtain an effective rotating speed B;
step 2.4: the ECU performs low-pass filtering processing on the effective rotating speed B to obtain a judgment rotating speed C;
step 2.5: the ECU sets a rotating speed drift value D, and when C is more than or equal to A + D, the ECU judges that the diesel engine is in a sudden unloading working condition;
and 3, step 3: the ECU sends a fuel cut-off request to the fuel quantity calculation module, and when the fuel cut-off condition is met, the fuel quantity calculation module sets the fuel injection quantity to be 0 and executes the fuel cut-off action on the diesel engine;
and 4, step 4: the ECU finishes the oil cut-off action and recovers the oil quantity;
and 5: and (3) starting the fuel cut-off release timing by the ECU, and returning to the step (2) after the timing is finished.
The step 1 further comprises:
step 1.1: electrifying the key, and enabling the diesel engine to enter a speed regulation state after acquiring a constant rotating speed switch signal;
step 1.2: the ECU sets a constant rotating speed A, the diesel engine enters an idling state after being started, and the ECU controls the rotating speed of the diesel engine to be increased to the constant rotating speed A according to a constant rotating speed switch signal acquired by the diesel engine;
step 1.3: and (3) judging whether the rotating speed of the diesel engine reaches a constant rotating speed A by the ECU, if so, finishing initialization action, starting a sudden unloading speed regulation function, executing the step 2, and if not, continuously monitoring the rotating speed of the diesel engine until the rotating speed of the diesel engine is equal to the constant rotating speed A.
In the step 1.3, when the sudden unloading speed regulation function is started, the fuel cut-off release flag of the fuel quantity calculation module is 1.
In the step 2.3, the screening method of the effective rotating speed B comprises the following steps: updating the real-time rotating speed S of the diesel engine once every updating time t E Screening the nth real-time rotating speed S of the diesel engine En If the real-time updating time T at the moment is less than or equal to T, the nth effective rotating speed B = the 1 st real-time rotating speed S of the diesel engine E1 If the real-time updating time T at the moment is more than T, the nth effective rotating speed B = the xth real-time rotating speed S of the diesel engine Ex (ii) a Wherein x is a natural number rounded up by T/T.
In the step 2.5, when A-D is more than C and less than A + D, the ECU judges that the diesel engine is in a stable running state, and the step 2.1 is returned; and when C is less than or equal to A-D, the ECU judges that the diesel engine is in the sudden-adding working condition.
In the step 3, the oil cut-off condition comprises the following steps:
(i) The ECU determines that the diesel engine is in a sudden unloading working condition;
(ii) The fuel cut-off release flag of the fuel quantity calculation module is 1;
when the conditions (i) and (ii) are simultaneously satisfied, the fuel cut condition is satisfied.
In the step 3, when the fuel cut-off action is executed, the fuel cut-off release flag of the fuel quantity calculation module is 0; and after the oil cut-off action is finished for a certain time, the oil cut-off release flag of the oil quantity calculation module is recovered to be 1.
The certain time is 5s.
The oil cut-off action comprises 1-5 oil cut-off periods, and the length of each oil cut-off period is 10ms.
In the step 5, the time of the oil-cut release meter is 3 seconds.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention takes the real-time rotating speed of the diesel engine as the judgment basis of the sudden unloading action of the external load equipment, and does not need to pass through external equipment and means, thereby simplifying the judgment flow of the sudden unloading working condition of the diesel engine, and improving the timeliness and the result accuracy of the judgment of the sudden unloading working condition of the diesel engine on the basis of reducing the cost of software and hardware equipment.
2. According to the method, the real-time rotating speed of the diesel engine is screened and low-pass filtered to obtain the judgment rotating speed which is used as a parameter for judging the sudden unloading action of the external load equipment, the condition that the filtering effect is not ideal due to the fact that repeated data such as non-updated rotating speed and the like are adopted can be avoided through screening, meanwhile, the influence of high-frequency noise is reduced through filtering, and the effectiveness and the accuracy of judgment on the sudden unloading working condition are guaranteed.
3. The invention can effectively compensate the error generated in the signal acquisition, processing and calculation processes due to the setting of the rotating speed drift amount in a certain range for the constant rotating speed, avoid the condition of false triggering of the oil-cut action and ensure that the ECU can judge the states of the normal operation, the sudden-loading working condition and the sudden-unloading working condition of the diesel engine more accurately.
4. The invention adopts periodic oil cut, obtains the number of oil cut cycles according to the value of the judged rotating speed by looking up a table, and selects different numbers of oil cut cycles according to different dump load conditions, thereby having more pertinence and more accuracy in adjusting the frequency overshoot rate of the diesel engine.
The invention can judge whether the external load equipment has sudden unloading action or not through the rotating speed monitoring of the diesel engine, and trigger the fuel cut-off action instruction under the sudden unloading working condition, can reduce the frequency overshoot of the diesel engine to below 6% directly through the fuel cut-off, can shorten the frequency recovery time, meets the national standard requirement, ensures the stable operation of the diesel engine on the basis of not influencing PID control, achieves the quick, direct and safe speed regulation effect, and is suitable for various engineering mechanical equipment taking the diesel engine as power, such as power stations, loaders and the like.
Drawings
FIG. 1 is a flow chart of a sudden unloading speed regulation method of a diesel engine.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Referring to the attached drawing 1, a method for governing sudden unloading of a diesel engine can be applied to equipment which takes the diesel engine as power in the field of engineering machinery, such as power stations, loaders and the like. When the diesel engine is connected to equipment, if the load of a power station is suddenly closed or the load of a loader is suddenly unloaded, namely the sudden unloading working condition of the diesel engine occurs, the method is adopted to control and adjust the rotating speed of the diesel engine.
The sudden unloading speed regulation of the diesel engine comprises the following steps:
step 1: and initializing the sudden unloading speed regulation function of the diesel engine.
Step 1.1: the key is electrified, and the diesel engine enters a speed regulation state after acquiring a constant rotating speed switch signal. The constant rotating speed switching signal is provided by equipment taking a diesel engine as POWER, and the constant rotating speed switching signal can be a PTO (Power-Take-OFF) switching signal or a TSC1 message and the like, and the signal type of the constant rotating speed switching signal is determined by the equipment.
Step 1.2: the ECU sets a constant rotating speed A, the diesel engine enters an idling state after being started, and the ECU controls the rotating speed of the diesel engine to be increased to the constant rotating speed A according to a constant rotating speed switch signal collected by the diesel engine. ECU accessible prior art PID module calculates the fuel injection quantity for the rotational speed of diesel engine is adjusted to the constant rotational speed A, and it is no longer repeated here.
Step 1.3: and (3) judging whether the rotating speed of the diesel engine reaches a constant rotating speed A by the ECU, if so, finishing initialization action, starting a sudden unloading speed regulation function, executing the step 2, and if not, continuously monitoring the rotating speed of the diesel engine until the rotating speed of the diesel engine is equal to the constant rotating speed A.
In the step 1.3, when the sudden unloading speed regulation function is started, the fuel cut-off release flag of the fuel quantity calculation module is 1, that is, the fuel cut-off function is in a release state, and the fuel cut-off action is not executed.
Step 2: and (3) monitoring the real-time rotating speed of the diesel engine by the ECU, judging whether the sudden unloading action occurs to the diesel engine according to the real-time rotating speed of the diesel engine, executing the step 3 if the sudden unloading action occurs to the diesel engine, and continuously monitoring the real-time rotating speed of the diesel engine if the sudden unloading action does not occur to the diesel engine.
Step 2.1: the ECU calculates the updating time t (unit is ms) of the rotation speed of the diesel engine according to the constant rotation speed A, and the calculation formula is as follows:
t=60*1000/（A*N C ）；
wherein N is C Is the cylinder number of the diesel engine.
Step 2.2: the ECU calculates the real-time updating time T (unit is ms) of the rotating speed of the diesel engine according to the real-time rotating speed of the diesel engine, and the calculation formula is as follows:
T=60*1000/（S E *N C ）；
wherein S is E Is the real-time rotation speed (r/min) of the diesel engine.
Step 2.3: and the ECU screens the real-time rotating speed of the diesel engine according to the updating time T and the real-time updating time T of the rotating speed of the diesel engine to obtain the effective rotating speed B. Preferably, the screening of the effective rotating speed B can be performed by using a chip interrupt manner in the prior art, and the interrupt period is the update time t.
The screening method of the effective rotating speed B comprises the following steps:
updating the real-time rotating speed S of the diesel engine once every updating time t E Screening the nth real-time rotating speed S of the diesel engine En If the real-time updating time T at the moment is less than or equal to T, the nth effective rotating speed B = the 1 st real-time rotating speed S of the diesel engine E1 If the real-time update time T > T at that time point, the nth effective rotation speed B = the xth (x is a natural number rounded up to T/T) real-time rotation speed S of the diesel engine Ex 。
Specifically, the diesel engine updates a real-time rotating speed S every updating time t =10ms E Is denoted as S E1 、S E2 、S E3 、…、S En 8230; in thatScreening the first real-time speed S of the diesel engine E1 The real-time updating time T =8ms < 10ms at the moment, and the real-time rotating speed S of the diesel engine is adjusted E Setting the rotation speed to be constant A; screening the nth real-time rotating speed S of the diesel engine En If the real-time update time T =25ms > 10ms at that time, the real-time rotation speed of the diesel engine is set to the 3 rd real-time rotation speed S of the diesel engine E3 。
Step 2.4: and the ECU performs low-pass filtering processing on the effective rotating speed B to obtain a judgment rotating speed C. Preferably, the effective rotation speed B may be low-pass filtered by using a time constant.
In the mechanical engineering equipment in the prior art, an oil quantity calculation module is a commonly-used function module for calculating the oil injection quantity of a diesel engine, an oil cut-off function module is a function module for executing oil cut-off, the calculation period of the oil quantity calculation module is required to be less than or equal to the calling period of the oil cut-off function module, and when the low-pass filtering processing of the rotating speed C is judged, the time constant of the oil quantity calculation module is required to be greater than the calling period of the oil cut-off function module. Preferably, the time constant is 2-4 times of the calling period of the fuel cut function module.
Step 2.5: the ECU sets a rotating speed drift value D, and the rotating speed drift value D can be determined according to the rotating speed data, and is preferably 5-15rpm; when A-D is more than C and less than A + D, the ECU judges that the diesel engine is in a stable running state, and returns to the step 2.1; when C is less than or equal to A-D, the ECU judges that the diesel engine is in the sudden-adding working condition, and when the diesel engine is in the sudden-adding working condition, the processing mode of the sudden-adding working condition in the prior art can be adopted, and the details are not repeated; and when C is larger than or equal to A + D, the ECU judges that the diesel engine is in the sudden unloading working condition.
And step 3: and the ECU sends a fuel cut-off request to the fuel quantity calculation module, and when the fuel cut-off condition is met, the fuel quantity calculation module sets the fuel injection quantity to be 0 and executes the fuel cut-off action on the diesel engine.
The oil cut-off condition comprises the following steps:
(i) The ECU determines that the diesel engine is in a sudden unloading working condition;
(ii) The fuel cut-off release flag of the fuel quantity calculation module is 1;
when the conditions (i) and (ii) are simultaneously satisfied, the fuel cut condition is satisfied.
In the step 3, when the fuel cut-off action is executed, the fuel cut-off release flag of the fuel quantity calculation module is 0, and the fuel cut-off action can be carried out; after the oil cut-off action is finished for a certain time, the oil cut-off release flag of the oil quantity calculation module is recovered to be 1, and the oil cut-off action can not be carried out.
The certain time is determined by a performance parameter in the ECU, preferably 5s.
The oil cut-off action comprises a plurality of oil cut-off periods, preferably, the number of the oil cut-off periods is 1-5, and the length of each oil cut-off period is 10ms. Different oil-cut cycles are selected according to different sudden unloading load states, namely the real-time rotating speed condition of the diesel engine, so that the effectiveness, timeliness and pertinence of the oil-cut time on the rotating speed regulation of the diesel engine are ensured, and the rotating speed of the diesel engine is accurately and reliably regulated.
And 4, step 4: and the ECU finishes the oil cut-off action and recovers the oil quantity. The oil cut-off action does not influence the calculation of the original PID module, the control of the PID module can be recovered after the oil cut-off action is finished, and the oil injection quantity is recovered to the calculated value of the PID module.
And 5: and (3) starting the fuel cut-off release timing by the ECU, and returning to the step (2) after the timing is finished.
In the sudden unloading adjusting stage after one-time oil cut is finished, the oil cut is not triggered any more usually, and the sudden unloading adjusting stage can be timed. Preferably, the time of the oil cut release meter is 3 seconds.
Example 1:
the application scenario of the embodiment is a power station which generates power by taking a diesel engine as power.
Step 1: the sudden unloading speed regulation function of a diesel engine in a power station is initialized.
The ECU sets the constant rotating speed A =1500rpm of the power station and starts a diesel engine, and the diesel engine enters a speed regulation state after acquiring a constant rotating speed switching signal of the power station. The ECU monitors the real-time rotating speed of the diesel engine, when the real-time rotating speed of the diesel engine = constant rotating speed A =1500rpm, the sudden-release speed regulation function is started, and the fuel cut-off release mark is 1 at the moment.
And 2, step: the ECU monitors the real-time rotating speed of the diesel engine, the ECU calculates the updating time t of the rotating speed of the diesel engine according to the real-time rotating speed of the diesel engine, and the implementationIn the example, the number of cylinders of the diesel engine is N C =4, the calculation formula is: t =60 × 1000/(a × N) C ) =10ms. The ECU screens the real-time rotating speed of the diesel engine in a chip interrupt mode according to the updating time t of the rotating speed of the diesel engine, the interrupt period is the updating time t, and S is carried out when the real-time rotating speed of the diesel engine is screened for the 1 st time E1 The rotating speed of the engine is 1500rpm, the real-time updating time T =10ms, the obtained effective rotating speed B is 1500rpm, the steady-state rotating speed of the effective rotating speed B is 1497-1505rpm in the actual running process, and the screening accuracy of the effective rotating speed B is high. And the ECU performs low-pass filtering processing on the effective rotating speed B, the calling period of the power station oil interruption function module is 10ms, and the time constant of the low-pass filtering is 30ms, so that the judgment rotating speed C =1518rpm is obtained. And the ECU sets a rotating speed drift value D =15rpm, then the rotating speed C =1518 is judged to be more than 1515rpm, and the ECU judges that the diesel engine is in a sudden unloading working condition, namely that an external load device of the power station is suddenly disconnected or closed.
And step 3: the ECU sends a fuel cut-off request to the fuel quantity calculation module, the fuel cut-off release flag of the fuel quantity calculation module is 1 at the moment, the fuel cut-off condition is met, the fuel injection quantity of the fuel quantity calculation module is set to be 0, the fuel cut-off action is executed on the diesel engine, and the fuel cut-off release flag of the fuel quantity calculation module is 0. The oil break period is 10ms, and as can be seen from the table 1, the oil break time is 10ms when the oil break period corresponding to the rotation speed C =1518rpm is 1. And 5 seconds after the execution of the fuel cut-off action is finished, the fuel quantity calculating module restores the fuel cut-off release flag to be 1.
TABLE 1 judging relationship between rotation speed C and cycle number
| Judging the rotation speed C | C＜1525 | 1525≤C＜1535 | 1535≤C＜1545 | 1545≤C＜1560 | 1560≤C |
| Number of cycles | 1 | 2 | 3 | 4 | 5 |
And 4-5: and (3) the ECU recovers the fuel injection amount to the fuel amount calculated by the PID module at the moment, the ECU returns to the step (2) after the fuel cut-off release meter of the ECU is used for 3s, the speed regulation process of one sudden unloading working condition is completed, and the rotating speed of the diesel engine is continuously detected.
In this embodiment, if the ECU determines that the fuel cut-off operation is not performed when the diesel engine is in the dump mode, and the oil amount calculated by the PID module is still large, the rotation speed of the diesel engine will continue to increase. Due to the loss of power, the rising speed is reduced, the highest point of the rotating speed reaches 1695-1710rpmm, namely the frequency overshoot percentage is 13-14%, and the frequency overshoot percentage cannot be controlled within the range of 1575-1605rpm, namely the frequency overshoot percentage is 5-7%. After the speed of the diesel engine is regulated by adopting the speed regulation method, the highest point of the rotating speed of the diesel engine under the sudden unloading working condition is 1555rpm, and the frequency overshoot percentage of the diesel engine can be reduced to 3.7 percent, thereby meeting and being superior to the requirement that the frequency overshoot percentage is 5-7 percent.
The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A sudden unloading speed regulation method of a diesel engine is characterized in that: the method comprises the following steps:
step 1: initializing a sudden unloading speed regulation function of the diesel engine;
step 1.1: electrifying the key, and enabling the diesel engine to enter a speed regulation state after acquiring a constant rotating speed switching signal;
step 1.2: the ECU sets a constant rotating speed A, the diesel engine enters an idling state after being started, and the ECU controls the rotating speed of the diesel engine to be increased to the constant rotating speed A according to a constant rotating speed switch signal acquired by the diesel engine;
step 1.3: the ECU judges whether the rotating speed of the diesel engine reaches a constant rotating speed A, if so, the initialization action is finished, the sudden unloading speed regulation function is started, the step 2 is executed, and if not, the rotating speed of the diesel engine is continuously monitored until the rotating speed of the diesel engine is equal to the constant rotating speed A;
step 2: the ECU monitors the real-time rotating speed of the diesel engine, judges whether the diesel engine has sudden unloading action or not according to the real-time rotating speed of the diesel engine, if so, executes the step 3, and if not, continues to monitor the real-time rotating speed of the diesel engine;
step 2.1: the ECU calculates the updating time t of the rotating speed of the diesel engine according to the constant rotating speed A, and the calculation formula is as follows:
t＝60*1000/(A*N C )；
wherein N is C The number of cylinders of the diesel engine;
step 2.2: the ECU calculates the real-time updating time T of the rotating speed of the diesel engine according to the real-time rotating speed of the diesel engine, and the calculation formula is as follows:
T＝60*1000/(S E *N C )；
wherein S is E The real-time rotating speed of the diesel engine;
step 2.3: the ECU screens the real-time rotating speed of the diesel engine according to the updating time T and the real-time updating time T of the rotating speed of the diesel engine to obtain an effective rotating speed B;
step 2.4: the ECU performs low-pass filtering processing on the effective rotating speed B to obtain a judgment rotating speed C;
step 2.5: the ECU sets a rotating speed drift value D, and when C is larger than or equal to A + D, the ECU judges that the diesel engine is in a sudden unloading working condition;
and step 3: the ECU sends a fuel cut-off request to the fuel quantity calculation module, and when the fuel cut-off condition is met, the fuel quantity calculation module sets the fuel injection quantity to be 0 and executes the fuel cut-off action on the diesel engine;
and 4, step 4: the ECU finishes the oil cut-off action and recovers the oil quantity;
and 5: the ECU starts oil cut-off release timing, and returns to the step 2 after timing is finished;
in the step 2.3, the screening method of the effective rotating speed B comprises the following steps: updating the real-time rotating speed S of the diesel engine once every updating time t E Screening the nth real-time rotating speed S of the diesel engine En If the real-time updating time T is less than or equal to T, the nth effective rotating speed B = the real-time rotating speed S of the 1 st diesel engine E1 If the real-time updating time T is more than T, the nth effective rotating speed B = the xth real-time rotating speed S of the diesel engine Ex (ii) a Wherein x is a natural number rounded up by T/T.
2. The sudden unloading speed regulating method for the diesel engine according to claim 1, which is characterized in that: in the step 1.3, when the sudden unloading speed regulation function is started, the fuel cut-off release flag of the fuel quantity calculation module is 1.
3. The sudden unloading speed regulating method for the diesel engine according to claim 1, which is characterized in that: in the step 2.5, when A-D is more than C and less than A + D, the ECU judges that the diesel engine is in a stable running state, and returns to the step 2.1; and when C is less than or equal to A-D, the ECU judges that the diesel engine is in the sudden-adding working condition.
4. The speed governing method for sudden unloading of the diesel engine according to claim 1, which is characterized in that: in the step 3, the oil cut-off condition comprises the following steps:
(i) The ECU determines that the diesel engine is in a sudden unloading working condition;
(ii) The fuel cut-off release flag of the fuel quantity calculation module is 1;
when the conditions (i) and (ii) are simultaneously satisfied, the fuel cut condition is satisfied.
5. The speed governing method for sudden unloading of the diesel engine according to claim 1, which is characterized in that: in the step 3, when the fuel cut-off action is executed, the fuel cut-off release flag of the fuel quantity calculation module is 0; and after the execution of the fuel cut-off action is finished for a certain time, the fuel cut-off release flag of the fuel quantity calculation module is recovered to be 1.
6. The speed governing method for sudden unloading of the diesel engine as set forth in claim 5, characterized in that: the certain time is 5s.
7. The sudden unloading speed regulation method of the diesel engine according to claim 1 or 5, which is characterized in that: the oil cut-off action comprises 1-5 oil cut-off periods, and the length of each oil cut-off period is 10ms.
8. The sudden unloading speed regulating method for the diesel engine according to claim 1, which is characterized in that: in the step 5, the time for timing the oil cut-off release is 3 seconds.
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