CN115263569A - Parallel operation control method and system for multiple diesel engines - Google Patents
Parallel operation control method and system for multiple diesel engines Download PDFInfo
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- CN115263569A CN115263569A CN202210987707.0A CN202210987707A CN115263569A CN 115263569 A CN115263569 A CN 115263569A CN 202210987707 A CN202210987707 A CN 202210987707A CN 115263569 A CN115263569 A CN 115263569A
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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
- F02D25/00—Controlling two or more co-operating engines
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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 provides a method and a system for controlling the parallel operation of a plurality of diesel engines. The speed regulator is used as an actuating mechanism, receives an accelerator control electric signal sent by the parallel operation control system, converts the accelerator control electric signal into mechanical force to drive the diesel engine accelerator control mechanism to act, and adjusts the fuel injection quantity of each cycle of the diesel engine. The parallel operation control system is based on the control idea of a single speed governor method, and the power balance controller is adopted to store the rotating speed-accelerator-power curve of each diesel engine and obtain the accelerator output of each diesel engine through high-precision power mapping operation, so that the problem of power imbalance caused by characteristic difference of the parallel operation diesel engine and the speed governor is fundamentally solved, and the parallel operation control system is easy to realize, stable and reliable and high in control precision.
Description
Technical Field
The invention relates to a parallel operation control method and a control system for multiple diesel engines, and belongs to the field of automatic parallel operation control of diesel engines.
Background
The diesel and diesel combined power device outputs the power of two or more diesel engines after the parallel operation of the gear boxes, can greatly widen the power coverage of the diesel engines, and is widely applied to large ships and special ships. In addition, the combined power device can adopt single machine propulsion under low working conditions and adopt multi-machine parallel propulsion under high working conditions, thereby greatly improving the maneuverability and the economy of the power device.
The current mainstream parallel control methods include a parallel speed regulator method, a master-slave speed regulator method and a single speed regulator method. The parallel speed regulator method realizes the parallel control function by mainly regulating the rotating speed setting signal of the diesel engine and is difficult to overcome the characteristic difference of the diesel engine and the speed regulator, so the control effect and the adaptability are poor. The master-slave speed governor method mainly depends on measuring the position of the throttle of the diesel engine to dynamically adjust the setting signal of the rotating speed of the diesel engine, but the measuring error of the position of the throttle is large, and the slave machines have certain control lag, so the dynamic control effect is not ideal. The single speed governor method adopts one speed governor to simultaneously control the throttles of a plurality of diesel engines during the parallel operation, can solve the problem of control lag between the parallel diesel engines, but how to overcome the characteristic difference of the diesel engines and the speed governors, and the power balance of the plurality of diesel engines by utilizing the output of the single speed governor is still a great problem.
Disclosure of Invention
In order to solve the technical problems that power distribution is difficult to balance when a parallel speed regulator method and a single speed regulator method are used for running a plurality of diesel engines in a parallel mode and a master-slave speed regulator method has certain control lag, the invention provides a method for controlling the parallel running of the plurality of diesel engines in a first aspect. The invention provides a method for controlling the disconnection of a plurality of diesel engines. The invention provides a parallel operation control system for a plurality of diesel engines.
The technical scheme of the invention is as follows:
a parallel operation control method for a plurality of diesel engines comprises the following steps:
before parallel operation, the power balance controller calculates the accelerator output value P of each diesel engine by using a rotating speed closed-loop control unit according to the difference value between the set rotating speed and the actual rotating speed of each diesel engine based on the rotating speed setting signal of each diesel engine and the actual rotating speed signal of each diesel engine detected by a rotating speed sensor n N is the number of diesel engines in parallel, n =1,2 \8230, 8230n;
after the multi-machine connecting and exhausting are completed, the power of the diesel engine connected and exhausted in advance is balancedThe controller still utilizes the rotating speed closed-loop control unit to calculate the accelerator output value P of each diesel engine according to the difference value of the set rotating speed and the actual rotating speed of each diesel engine 1 (ii) a For the diesel engine to be paralleled, the power balance controller calculates the target throttle value P of the diesel engine to be paralleled according to the power distribution proportion of the diesel engine to be paralleled and the diesel engine to be paralleled by utilizing the rotating speed-throttle-power curve stored in the power operation unit b Then gradually increasing the throttle output value P of the diesel engine to be merged according to a set speed n+1 To P b Completing the vehicle combination process, wherein n =1,2 \8230, 8230n;
in the whole parallel operation process, the power balance controller utilizes the accelerator output unit to output the accelerator output value P of each diesel engine n Converted into throttle control signal F n Sending the signals to a speed regulator of each diesel engine, wherein n =1,2 \ 8230 \8230;/8230;
the speed regulator controls the signal F according to the throttle n The diesel engine throttle control mechanism is driven to realize the control of the fuel injection quantity of each cycle of the diesel engine, so that the power of the diesel engine finally achieving the set distribution ratio n =1,2 \8230, n.
A method for controlling the disconnection of a plurality of diesel engines comprises the following steps:
before splitting, the power balance controller inquires a splitting accelerator target value P of the diesel engine to be split by using a rotating speed-accelerator-power curve stored in the power operation unit j ；
In the splitting process, for the diesel engine in the exhaust, the power balance controller calculates the throttle output value P of the diesel engine by using a rotating speed closed-loop control unit 1 (ii) a For the diesel engine to be split, the power balance controller gradually reduces the throttle output value P thereof according to a set speed n+1 To P j Then, the diesel engine to be subjected to splitting is subjected to splitting, namely, the splitting process is finished, wherein n =1,2 \8230, 8230n;
in the whole splitting process, the power balance controller utilizes the accelerator output unit to output the accelerator output value P of each diesel engine n Converted into throttle control signal F n Is sent to the speed regulator of each diesel engine,wherein n =1,2 \8230, n;
the speed regulator controls the signal F according to the throttle n The throttle control mechanism of the diesel engine is driven to realize the control of the fuel injection quantity of each cycle of the diesel engine, wherein n =1,2 \8230, 8230and n.
A parallel operation control system of a plurality of diesel engines is used for the parallel operation control method of a plurality of diesel engines or for the disconnection control method of a plurality of diesel engines, the signal input end of the parallel operation control system is electrically connected with the signal output end of a rotating speed sensor of each diesel engine, the signal output end of the parallel operation control system is electrically connected with the signal input end of a speed regulator of each diesel engine, and the output end of the speed regulator of each diesel engine is connected with a throttle control mechanism of each diesel engine;
the parallel operation control system comprises a power balance controller, wherein the power balance controller comprises a rotating speed closed-loop control unit, a power operation unit and an accelerator output unit;
the rotating speed closed-loop control unit calculates the accelerator output value of each diesel engine according to the difference value between the set rotating speed and the actual rotating speed of each diesel engine;
the power operation unit stores a rotating speed-accelerator-power curve of each diesel engine provided by a diesel engine manufacturer or determined by a test, and can calculate an accelerator output value of each diesel engine according to a set power proportion of each diesel engine;
the throttle output unit is used for converting a throttle output value into a throttle control signal which can be received and executed by a speed regulator of each diesel engine;
the speed regulator is used as an execution mechanism, receives the throttle control electric signal sent by the parallel operation control system, and drives a throttle control mechanism of the diesel engine according to the throttle control signal so as to realize the control of the oil injection quantity of each cycle of the diesel engine.
In the parallel operation, the rotating speed closed-loop control unit calculates the accelerator output value of each diesel engine according to the difference value between the set rotating speed of each diesel engine which independently operates and the actual rotating speed detected from the rotating speed sensor before parallel operation; after parallel operation, calculating the accelerator output value of the diesel engine in the first row according to the difference value between the set rotating speed and the actual rotating speed of the diesel engine in the first row; the power operation unit is used for storing a rotating speed-accelerator-power curve of each diesel engine provided by a diesel engine manufacturer or determined by a test, calculating an accelerator target value of the diesel engine to be merged according to a set power distribution ratio of the diesel engines to be connected in parallel and the diesel engine to be merged, and gradually increasing the accelerator output value of the diesel engine to be merged to the accelerator target value according to a set speed; the throttle output unit is used for converting the throttle output value of each diesel engine into a throttle control signal which can be received and executed by the speed regulator; the speed regulator is used as an actuating mechanism, receives the throttle control electric signal, and drives a diesel engine throttle control mechanism according to the throttle control signal, so that the control of the oil injection quantity of each cycle of the diesel engine is realized.
In the splitting operation, the rotating speed closed-loop control unit calculates the accelerator output value of the diesel engine on the exhaust line according to the difference value of the set rotating speed and the actual rotating speed of the diesel engine on the exhaust line; the power operation unit queries a splitting accelerator target value of the diesel engine to be split by using a stored rotating speed-accelerator-power curve before splitting, and gradually reduces the current accelerator output value of the diesel engine to be split to the splitting accelerator target value according to a set speed in the splitting process; the throttle output unit is used for converting the throttle output value of each diesel engine into a throttle control signal which can be received and executed by the speed regulator; the speed regulator is used as an actuating mechanism, receives the throttle control electric signal, and drives a diesel engine throttle control mechanism according to the throttle control signal, so that the control of the oil injection quantity of each cycle of the diesel engine is realized.
The power balance controller comprises a signal acquisition unit, and the signal acquisition unit is used for sampling frequency signals sent by the rotating speed sensor of each diesel engine and converting the frequency signals into the actual rotating speed of the diesel engine.
And the rotating speed closed-loop control unit calculates the accelerator output value of each diesel engine by adopting a PID control algorithm.
The invention has the beneficial technical effects that:
the invention relates to a method for controlling parallel operation of a plurality of diesel engines, which is used before parallel operationThen, the first-row diesel engine controls the output of an accelerator all the time based on the difference between an actual rotating speed signal detected by the diesel engine from a rotating speed sensor and a rotating speed setting signal of the diesel engine; after the diesel engines to be paralleled are paralleled, the rotating speed-accelerator-power curve of each diesel engine reflecting the inherent characteristics of each diesel engine is stored by a power balance controller, and the accelerator target value of the diesel engine to be paralleled is calculated according to the distribution proportion of the power of each diesel engine to be paralleled, namely the power of the diesel engine connected and discharged firstly calculates the accelerator output value of the diesel engine connected and discharged firstly through the difference value of the set rotating speed and the actual rotating speed, the current power (power = rotating speed-accelerator with a certain coefficient) of the diesel engine connected and discharged firstly can be calculated according to the actual rotating speed and the accelerator output value, and then the accelerator target value P of the diesel engine to be paralleled is calculated according to the set power distribution proportion and the rotating speed-accelerator-power curve of each diesel engine b Then gradually increasing the throttle output value P of the diesel engine to be merged according to a set speed n+1 To P b And completing the parallel operation process. Therefore, according to the power distribution principle of the parallel operation host, the parallel operation control method takes one diesel engine as a main diesel engine (or called speed-regulating diesel engine), and the accelerator of the other diesel engine is calculated through the stored mapping relation formed by the rotating speed-accelerator-power curves of all the diesel engines, so that the accelerator output of all the diesel engines is obtained through high-precision power mapping calculation.
According to the method for controlling the disconnection of the plurality of diesel engines, the accelerator output is controlled on the basis of the difference between the actual rotating speed signal of the diesel engine and the rotating speed setting signal of the diesel engine before and after the disconnection. The diesel engine to be split inquires the split accelerator target value P of the diesel engine to be split through a rotating speed-accelerator-power curve stored by the power balance controller j Gradually reducing the throttle output value P according to a set speed n+1 To P j And then, the diesel engine to be split is subjected to exhaust removal, and the splitting process is finished. When splitting, only the splitting accelerator target value P of the splitting diesel engine needs to be accurately inquired j The split diesel engine can reduce the power gradually, and the whole process is stable and easy to realize.
The invention relates to a parallel operation control system of a plurality of diesel engines, which realizes the parallel operation control method and the parallel operation control method. The parallel operation control system is based on the control idea of a single speed governor method, overcomes the defects of the prior art, adopts a special power balance controller to store the rotating speed-accelerator-power curve of each diesel engine, obtains the accelerator output of each diesel engine through high-precision power mapping operation, fundamentally solves the problem of unbalanced power caused by characteristic differences of the parallel operation diesel engine and the speed governor, and provides the parallel operation control system of a plurality of diesel engines, which is easy to realize, stable and reliable and has high control precision. The control system has the following advantages:
1. a special power balance controller is adopted to simultaneously send throttle control signals to a plurality of speed regulators, the master-slave relation and control lag do not exist among all diesel engines, and the steady-state and dynamic control performance of the parallel control system is excellent.
2. The power balance controller stores the rotating speed-accelerator-power curve of each diesel engine, and when the parallel operation is carried out, the power balance controller can accurately convert the accelerator output of other parallel diesel engines according to the accelerator of any one diesel engine, namely the power balance control of the parallel operation diesel engines can be realized, so that the control precision and the reliability of the whole system are higher.
3. When the diesel engine runs for a period of time and the performance parameters are changed, the satisfactory control effect can still be ensured only by measuring and correcting the rotating speed-accelerator-power curve of each diesel engine in time.
Drawings
FIG. 1 is a schematic block diagram of an embodiment of a multiple diesel engine parallel operation control system of the present invention;
fig. 2 is a schematic diagram of the operation of the power balance controller of the present invention.
Reference numerals: 1-parallel operation control system, 11-power balance controller, 111-signal acquisition unit, 112-rotating speed closed-loop control unit, 113-power operation unit, 114-accelerator output unit, 2, 4-speed regulator, 3, 5-diesel engine, 31, 51-accelerator control mechanism, 32, 52-rotating speed sensor, 6-parallel operation gear box, 61, 62-clutch and 7-power output device.
Detailed Description
Preferred embodiments for implementing the technical solution of the present application will be described in detail below with reference to fig. 1-2.
Example 1
The parallel operation control system can realize parallel operation control of two or more diesel engines, and the power distribution proportion is 1:1, namely the power of two diesel engines is equal, so the specific implementation of two diesel engines of the same type is illustrated by taking the principle of equal power and operating the two diesel engines in parallel. And for the parallel operation of the special diesel engines, calculation is carried out according to the required power proportion only when power mapping operation is carried out.
Referring to fig. 1, in the parallel operation control system for multiple diesel engines of this embodiment, a signal input end of the parallel operation control system 1 is electrically connected to a signal output end of a rotation speed sensor 32,52 of each diesel engine 3,5, a signal output end of the parallel operation control system 1 is electrically connected to a signal input end of a speed governor 2,4 of each diesel engine 3,5, and an output end of the speed governor 2,4 of each diesel engine 3,5 is connected to an accelerator control mechanism 31,51 of each diesel engine 3, 5.
The parallel operation control system 1 mainly includes a power balance controller 11. The power balance controller 11 is a module or board card with a microprocessor, and has functions of electric signal acquisition, logic operation and electric signal output.
The speed regulators 2 and 4 are actuators, and can receive electric signals of the power balance controller 11 and execute corresponding position output.
As shown in fig. 2, the power balance controller 11 includes a signal acquisition unit 111, a rotational speed closed-loop control unit 112, a power operation unit 113, and a throttle output unit 114.
The signal acquisition unit 111 can sample the frequency signals 32 and 52 sent by the rotating speed sensors 32 and 52 of each diesel engine 3 and 5 and convert the frequency signals into the actual rotating speed of the diesel engines 3 and 5.
And the rotating speed closed-loop control unit 112 calculates the accelerator output value of each diesel engine 3,5 by adopting a PID control algorithm according to the difference value between the set rotating speed and the actual rotating speed of each diesel engine 3, 5.
The power calculation unit 113 stores the rotation speed-accelerator-power curve of each diesel engine 3,5 provided by the diesel engine manufacturer or measured by tests, and can calculate the accelerator output value of each diesel engine according to the set power ratio of each diesel engine 3, 5.
And the accelerator output unit 114 converts the accelerator output value into an accelerator control signal which can be received and executed by the speed regulator.
The speed regulators 2 and 4 are used as actuating mechanisms for receiving throttle control electric signals sent by the parallel operation control system 1 and converting the throttle control electric signals into mechanical force to drive the diesel engine throttle control mechanisms 31 and 51 to act, so that the oil injection quantity of each cycle of the diesel engine is adjusted, or the diesel engine throttle control mechanisms 31 and 51 are driven according to the throttle control signals, and the control of the oil injection quantity of each cycle of the diesel engine is realized.
As shown in fig. 1, the diesel engine and diesel engine combined power device comprises a diesel engine 3, a diesel engine 5, a speed governor 2 corresponding to the diesel engine 3, a speed governor 4 corresponding to the diesel engine 5, a parallel operation gear box 6, a power output device 7 and the parallel operation control system 1.
The power output ends of the diesel engines 3 and 5 are respectively correspondingly connected with the input ends of the clutches 61 and 62 of the parallel operation gear box 6. The output end of the parallel operation gear box 6 is connected with a power output device 7. The power output device 7 may be a marine propeller or a hydraulic dynamometer.
The two diesel engines 3,5 are provided with corresponding throttle control mechanisms 31,51 and rotation speed sensors 32,52. The signal input end of the parallel operation control system 1 is electrically connected with the signal output end of the rotating speed sensor 32,52 of each diesel engine 3,5, the signal output end of the parallel operation control system 1 is electrically connected with the signal input end of the speed regulator 2,4 of each diesel engine 3,5, and the output end of the speed regulator 2,4 of each diesel engine 3,5 is connected with the throttle control mechanism 31,51 of each diesel engine 3, 5.
The diesel engine parallel control method of the embodiment adopts the above-mentioned multiple diesel engine parallel control system, takes the diesel engine 3 as the first-row diesel engine and the diesel engine 5 as the diesel engine to be parallel-connected as an example, and includes the following steps:
before the parallel operation, the clutch 61 corresponding to the diesel engine 3 is completedIn tandem, the diesel engine 3 outputs power to the power output device 7 through the parallel operation gear box 6. The clutch 62 corresponding to the diesel engine 5 is not connected, and the diesel engine 5 is in idle operation. At this time, the power balance controller 11 calculates the throttle output value P of the diesel engine 3 by the rotation speed closed-loop control means 112 based on the rotation speed setting signal of each diesel engine 3,5 and the actual rotation speed signal detected from the rotation speed sensors 32,52 1 Throttle output value P of diesel engine 5 2 Wherein the rotation speed setting signal is normally sent from an external system to the power balance controller 11.
After the clutch 62 finishes the connection and exhaust by the external action, the power balance controller 11 still calculates the throttle output value P of the diesel engine 3 connected in advance by using the rotating speed closed-loop control unit 112 1 . For the diesel engines 5 to be merged, the power balance controller 11 calculates the target throttle value P of the diesel engines 5 to be merged according to the principle that the powers of the two diesel engines 3 and 5 are equal by using the rotating speed-throttle-power curve of each diesel engine stored in the power operation unit 113 b Then gradually increasing the throttle output value P of the diesel engine 5 to be merged according to a set speed rate 2 To P b And finishing the parallel operation process.
In the whole parallel operation process, the power balance controller 11 utilizes the accelerator output unit 114 to output the accelerator output value P of each diesel engine 3,5 n Converted into throttle control signal F n And sending the signals to speed regulators 2 and 4 of each diesel engine 3 and 5. The speed regulator 2,4 is controlled according to the throttle control signal F n The accelerator control mechanisms 31 and 51 of the diesel engines 3 and 5 are driven to realize the control of the oil injection quantity of each cycle of the diesel engines 3 and 5.
For example, the current operating condition of a diesel engine is as follows: the rotating speed is 500rpm, the accelerator is 40%, and the current power can be calculated to be about 2000kW; when the power of the other diesel engine is equal, the following calculation can be obtained by utilizing the mapping relation through the stored curves of the rotating speed, the accelerator and the power: the throttle of another diesel engine is set to 45% when the power is 2000kW and the rotating speed is 500 rpm. If the power of the other diesel engine is half of that of the connected diesel engine, the accelerator when the power of the diesel engine to be combined is 1000kW and the rotating speed is 500rpm is calculated.
The diesel engine splitting control method of the embodiment adopts the above-mentioned multiple diesel engine parallel control system, takes the diesel engine 3 as an in-line diesel engine and the diesel engine 5 as a to-be-split diesel engine as an example, and includes the following steps:
before the disconnection, the clutches 61 and 62 corresponding to the diesel engines 3 and 5 are in a connected state, the clutch 62 corresponding to the diesel engine 5 is about to be disconnected, and the power balance controller 11 inquires a disconnection accelerator target value P of the diesel engine 5 to be disconnected by using a rotating speed-accelerator-power curve stored in the power operation unit 113 j 。
When receiving the splitting command, the power balance controller 11 calculates the throttle output value P of the diesel engine 3 in the row by using the rotating speed closed-loop control unit 112 1 . For the diesel engine 5 to be split, the power balance controller 11 gradually reduces its real-time throttle output value P according to a set rate 2 To P j Then the external action causes the clutch 62 to complete the de-clutching, i.e., complete the de-clutching process.
During the whole splitting process, the power balance controller 11 utilizes the accelerator output unit 114 to output the accelerator output value P of each diesel engine 3,5 n Converted into throttle control signal F n Sent to the speed regulators 2,4 of each diesel engine 3, 5. The speed regulator 2,4 is controlled according to the throttle control signal F n The throttle control mechanisms 31 and 51 of the diesel engines 3 and 5 are driven to realize the control of the fuel injection quantity of each cycle of the diesel engines 3 and 5.
Referring to fig. 2, the working principle of the power balance controller 11 will be further explained by taking the diesel engine 5 as a parallel operation or a split operation object in conjunction with the above embodiment:
in FIG. 2, r 1 (t)、r 2 (t) set rotational speeds of the diesel engines 3,5, respectively, b 1 (t)、b 2 (t) actual rotational speeds of the diesel engines 3,5, respectively, measured by the power balance controller 11, F 1 (t)、F 2 (t) are throttle control signals of the diesel engines 3 and 5 outputted from the power balance controller 11, respectively.
When the diesel engines 5 are not in parallel operation or split operation, that is, the diesel engines 3 and 5 operate independently, the power balance controller 11 calculates the throttle output value of each diesel engine 3 and 5 by using the rotating speed closed-loop control unit 112 according to the difference between the set rotating speed and the actual rotating speed of each diesel engine 3 and 5, and converts the throttle output value into a throttle control signal by the throttle output unit 114.
When the diesel engine 5 needs to merge, the power balance controller 11 still calculates the throttle control signal F of the diesel engine 3 by using the rotating speed closed-loop control unit 112 1 (t) of (d). For the diesel engine 5, the target throttle value P of the diesel engine 5 to be merged is calculated according to the principle that the powers of the two diesel engines are equal by using the curve of the rotating speed, the throttle and the power stored in the power operation unit 113 b Then gradually increasing the throttle output value P of the diesel engine 5 at a set rate 2 To P b Meanwhile, the throttle output unit 114 converts the throttle output value into a throttle control signal F 2 (t) of (d). The speed regulator 4 controls the signal F according to the throttle 2 (t) adjusting an accelerator control mechanism of the diesel engine 5, and finally enabling the power of the diesel engine 5 to be equal to the power of the diesel engine 3.
When the diesel engine 5 needs to be disconnected, the power balance controller 11 still calculates the throttle control signal F of the diesel engine 3 by using the rotating speed closed-loop control unit 112 1 (t) of (d). Meanwhile, the power balance controller 11 uses the power operation unit 113 to inquire the target value P of the splitting throttle of the diesel engine 5 to be split j Then gradually reducing the throttle output value of the diesel engine 5 to be split to P according to the set speed j The throttle output unit 114 converts the throttle output value into a throttle control signal F 2 (t) of (d). The speed regulator 4 controls the signal F according to the throttle 2 (t) the throttle control 51 of the diesel engine 5 is adjusted so that eventually the power of the diesel engine 5 approaches the idling power.
The foregoing is a further description of the present invention with reference to specific examples, which should not be construed as limiting the embodiments of the present invention. Insubstantial modifications and adaptations of the present invention over the above-described embodiments may occur to those skilled in the art without departing from the scope of the present invention.
Claims (7)
1. A parallel operation control method for a plurality of diesel engines is characterized by comprising the following steps:
before parallel operation, power balance controlThe controller respectively calculates the accelerator output value P of each diesel engine by using a rotating speed closed-loop control unit according to the difference value of the set rotating speed and the actual rotating speed of each diesel engine based on the rotating speed setting signal of each diesel engine and the actual rotating speed signal of each diesel engine detected by the rotating speed sensor n N is the number of diesel engines in parallel, n =1,2 \8230, 8230n;
after the multi-machine connecting and exhausting are completed, for the diesel engine connected and exhausted firstly, the power balance controller still utilizes the rotating speed closed-loop control unit to calculate the accelerator output value P of each diesel engine according to the difference value of the set rotating speed and the actual rotating speed of each diesel engine 1 (ii) a For the diesel engine to be paralleled, the power balance controller calculates the target throttle value P of the diesel engine to be paralleled according to the power distribution proportion of the diesel engine to be paralleled and the diesel engine to be paralleled by utilizing the rotating speed-throttle-power curve stored in the power operation unit b Then gradually increasing the throttle output value P of the diesel engine to be merged according to a set speed n+1 To P b Completing the vehicle combination process, wherein n =1,2 \ 8230, 8230and n;
in the whole parallel operation process, the power balance controller utilizes the accelerator output unit to output the accelerator output value P of each diesel engine n Converted into throttle control signal F n Sending the signals to a speed regulator of each diesel engine, wherein n =1,2 \ 8230 \8230;/8230;
the speed regulator controls the signal F according to the throttle n The diesel engine throttle control mechanism is driven to realize the control of the fuel injection quantity of each cycle of the diesel engine, so that the power of the diesel engine finally achieving the set distribution ratio n =1,2 \8230, n.
2. A method for controlling the disconnection of a plurality of diesel engines is characterized by comprising the following steps:
before splitting, the power balance controller inquires a splitting accelerator target value P of the diesel engine to be split by using a rotating speed-accelerator-power curve stored in the power operation unit j ；
In the splitting process, for the diesel engine in the exhaust, the power balance controller calculates the throttle output value P of the diesel engine by using a rotating speed closed-loop control unit 1 (ii) a For the diesel engine to be split, the power balance controller gradually reduces the throttle output value P thereof according to a set speed n+1 To P j Then, the diesel engine to be subjected to splitting is subjected to splitting, namely, the splitting process is finished, wherein n =1,2 \8230; n;
in the whole splitting process, the power balance controller utilizes the accelerator output unit to output the accelerator output value P of each diesel engine n Converted into throttle control signal F n The method is characterized by comprising the following steps of sending the signals to a speed regulator of each diesel engine, wherein n =1, 2\8230, 8230n;
the speed regulator controls the signal F according to the throttle n The throttle control mechanism of the diesel engine is driven to realize the control of the fuel injection quantity of each cycle of the diesel engine, wherein n =1,2 \8230, 8230and n.
3. A parallel operation control system of multiple diesel engines is characterized in that the parallel operation control system is used for the parallel operation control method of the multiple diesel engines in claim 1 or the split control method of the multiple diesel engines in claim 2, a signal input end of the parallel operation control system is electrically connected with a signal output end of a rotating speed sensor of each diesel engine, a signal output end of the parallel operation control system is electrically connected with a signal input end of a speed regulator of each diesel engine, and an output end of the speed regulator of each diesel engine is connected with a throttle control mechanism of each diesel engine;
the parallel operation control system comprises a power balance controller, wherein the power balance controller comprises a rotating speed closed-loop control unit, a power operation unit and an accelerator output unit;
the rotating speed closed-loop control unit calculates the accelerator output value of each diesel engine according to the difference value of the set rotating speed and the actual rotating speed of each diesel engine;
the power operation unit stores a rotating speed-accelerator-power curve of each diesel engine provided by a diesel engine manufacturer or determined by a test, and can calculate an accelerator output value of each diesel engine according to a set power proportion of each diesel engine;
the throttle output unit is used for converting a throttle output value into a throttle control signal which can be received and executed by a speed regulator of each diesel engine;
the speed regulator is used as an execution mechanism, receives the throttle control electric signal sent by the parallel operation control system, and drives a throttle control mechanism of the diesel engine according to the throttle control signal so as to realize the control of the oil injection quantity of each cycle of the diesel engine.
4. The system of claim 3, wherein, in the parallel operation,
the rotating speed closed-loop control unit calculates the accelerator output value of each diesel engine according to the difference value between the set rotating speed of each diesel engine which operates independently and the actual rotating speed detected by the rotating speed sensor before parallel operation; after parallel operation, calculating the accelerator output value of the diesel engine in the first row according to the difference value between the set rotating speed and the actual rotating speed of the diesel engine in the first row;
the power operation unit is used for storing a rotating speed-accelerator-power curve of each diesel engine provided by a diesel engine manufacturer or determined by a test, calculating an accelerator target value of the diesel engine to be merged according to a set power distribution ratio of the diesel engines to be connected in parallel and the diesel engine to be merged, and gradually increasing the accelerator output value of the diesel engine to be merged to the accelerator target value according to a set speed;
the accelerator output unit converts the accelerator output value of each diesel engine into an accelerator control signal which can be received and executed by the speed regulator;
the speed regulator is used as an actuating mechanism, receives the throttle control electric signal, and drives a diesel engine throttle control mechanism according to the throttle control signal, so that the control of the oil injection quantity of each cycle of the diesel engine is realized.
5. The system for controlling the parallel operation of a plurality of diesel engines according to claim 3 or 4, wherein, in the splitting operation,
the rotating speed closed-loop control unit calculates the accelerator output value of the on-line diesel engine according to the difference value between the set rotating speed and the actual rotating speed of the on-line diesel engine;
the power operation unit is used for inquiring a splitting accelerator target value of the diesel engine to be split by using a stored rotating speed-accelerator-power curve before splitting, and gradually reducing the current accelerator output value of the diesel engine to be split to the splitting accelerator target value according to a set speed in the splitting process;
the throttle output unit is used for converting the throttle output value of each diesel engine into a throttle control signal which can be received and executed by the speed regulator;
the speed regulator is used as an actuating mechanism, receives the throttle control electric signal, and drives a diesel engine throttle control mechanism according to the throttle control signal, so that the control of the oil injection quantity of each cycle of the diesel engine is realized.
6. The system for controlling the parallel operation of the plurality of diesel engines according to any one of claims 3 to 5, wherein the power balance controller comprises a signal acquisition unit, and the signal acquisition unit samples the frequency signal sent by the rotation speed sensor of each diesel engine and converts the frequency signal into the actual rotation speed of the diesel engine.
7. The system for controlling the parallel operation of the plurality of diesel engines as claimed in claim 3, wherein the rotating speed closed-loop control unit calculates the throttle output value of each diesel engine by adopting a PID control algorithm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210987707.0A CN115263569A (en) | 2022-08-17 | 2022-08-17 | Parallel operation control method and system for multiple diesel engines |
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| CN202210987707.0A CN115263569A (en) | 2022-08-17 | 2022-08-17 | Parallel operation control method and system for multiple diesel engines |
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| CN202210987707.0A Pending CN115263569A (en) | 2022-08-17 | 2022-08-17 | Parallel operation control method and system for multiple diesel engines |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115750108A (en) * | 2022-11-29 | 2023-03-07 | 上海船舶运输科学研究所有限公司 | Multifunctional speed regulation driving system and method for marine high-power diesel engine |
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