CN111076938A - Control method of starter load control system based on electric dynamometer - Google Patents
Control method of starter load control system based on electric dynamometer Download PDFInfo
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- CN111076938A CN111076938A CN201911391976.5A CN201911391976A CN111076938A CN 111076938 A CN111076938 A CN 111076938A CN 201911391976 A CN201911391976 A CN 201911391976A CN 111076938 A CN111076938 A CN 111076938A
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- 239000007858 starting material Substances 0.000 title claims abstract description 90
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000012360 testing method Methods 0.000 claims abstract description 23
- 230000003044 adaptive effect Effects 0.000 claims abstract description 19
- 230000008878 coupling Effects 0.000 claims abstract description 12
- 238000010168 coupling process Methods 0.000 claims abstract description 12
- 238000005859 coupling reaction Methods 0.000 claims abstract description 12
- 230000007704 transition Effects 0.000 claims description 9
- 238000004891 communication Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 abstract description 12
- 230000007547 defect Effects 0.000 abstract description 11
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 238000002485 combustion reaction Methods 0.000 description 6
- 239000000498 cooling water Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 239000007787 solid Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
Abstract
A control method of a starter load control system based on an electric dynamometer comprises a tested starter, a main engine of the electric dynamometer, a rotating speed encoder, a torque flange, an adaptive coupler, an upper computer, a closed-loop control lower computer and a four-quadrant operation frequency converter; the tested starter shafting is connected with one end of the adaptive coupling, the other end of the adaptive coupling is horizontally connected with the torque flange, the torque flange is horizontally connected with the main machine of the electric dynamometer, and the main machine of the electric dynamometer is connected with a rotating speed encoder; the torque flange is connected with an upper computer, a main machine of the electric dynamometer is respectively connected with a closed-loop control lower computer and a four-quadrant operation frequency converter, the closed-loop control lower computer is respectively and electrically connected with a rotating speed encoder and the four-quadrant operation frequency converter, and the upper computer is electrically connected with the closed-loop control lower computer; the invention simulates the resistance of the main engine to the starter, accurately controls the rotating speed in the starting process, measures and records the parameters of torque, rotating speed and the like, tests the performance of the starter, and solves the control defect and the environmental protection defect.
Description
Technical Field
The invention belongs to the technical field of testing, relates to the technologies of various internal combustion engines, aircraft engines, starters and the like, and particularly relates to a control method of a starter load control system based on an electric dynamometer.
Background
In the starting process of various internal combustion engines and aircraft engines, a starter matched with the internal combustion engines is started firstly, the engine is equivalent to the load of the starter, and the starter outputs a rotating speed to drive the engine to start. After the engine is started, the starter stops working.
At present, an eddy current dynamometer which is widely used for a test system of a starter load is generally adopted, the eddy current dynamometer cannot be actively dragged, and intervention cannot be adopted when the actual rotating speed is lower than the target rotating speed. The rack of electric dynamometer machine is then adopted in some, when handling the energy that the loading braking produced, adopts the braking chopper, turns into direct current with the energy, uses the resistance box heat production to consume, causes the energy waste, aggravates greenhouse effect.
Disclosure of Invention
In view of the above, in order to solve the above-mentioned deficiencies of the prior art, the present invention aims to provide a control method of a starter load control system based on an electric dynamometer, which simulates the resistance of a main engine to a starter according to the working state of the starter and the main engine when used in combination, accurately controls the rotating speed in the starting process, measures and records the parameters of torque, rotating speed and the like, and tests the performance of the starter; the defects of control defect, environmental protection defect and the like in the prior art are overcome.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a control method of a starter load control system based on an electric dynamometer comprises a tested starter, and further comprises an electric dynamometer main machine, a rotating speed encoder, a torque flange, an adaptive coupler, an upper computer, a closed-loop control lower computer and a four-quadrant operation frequency converter; the tested starter shafting is connected with one end of the adaptive coupler, the other end of the adaptive coupler is horizontally connected with the torque flange, the torque flange is horizontally connected with the main machine of the electric dynamometer, the main machine of the electric dynamometer is connected with the rotating speed encoder, and the tested starter, the adaptive coupler, the torque flange and the main machine of the electric dynamometer are all arranged on the mounting base;
the torque flange is connected with an upper computer, the main machine of the electric dynamometer is respectively connected with a closed-loop control lower computer and a four-quadrant operation frequency converter, the closed-loop control lower computer is respectively and electrically connected with a rotating speed encoder and the four-quadrant operation frequency converter, and the upper computer is electrically connected with the closed-loop control lower computer;
the control method comprises the following steps:
s1: on a human-computer interface of an upper computer, controlling the starting and stopping of the system, displaying a rotating speed and a torque parameter real-time value, recording and storing the rotating speed and the torque parameter real-time value, setting a rotating speed target value of a closed-loop control lower computer, setting a rotating speed and torque parameter alarm value according to the performance requirement of a tested starter, and actively controlling the system to stop when the rotating speed and the torque parameter real-time value reach the alarm value;
s2: the upper computer gives a signal for starting the electric dynamometer main machine by a closed-loop control lower computer in a communication mode, the closed-loop control lower computer controls the four-quadrant operation frequency converter to drive the electric dynamometer main machine to start, after the electric dynamometer main machine is started, the target rotating speed is given to be 0rpm, and the system is in a standby state;
s3: under the condition that the system is in a standby state, starting a tested starter, simultaneously setting a target rotating speed by an upper computer, and setting a target rotating speed of a closed-loop control lower computer by the upper computer in a communication mode;
s4: after the tested starter is started, the rotating speed of the tested starter is transmitted to a rotating speed encoder end at a speed ratio of 1:1, and the rotating speed measured by the rotating speed encoder is the rotating speed of the tested starter; the closed-loop control lower computer collects the rotating speed measured by the rotating speed encoder, controls the four-quadrant operation frequency converter through closed-loop operation, and drives the main engine of the electric dynamometer to reach the target rotating speed.
Furthermore, a transition support is arranged between the tested starter and the adaptive coupling.
Furthermore, the four-quadrant running frequency converter provides drive for the main engine of the electric dynamometer, and the main engine of the electric dynamometer simulates a main engine to provide load for the tested starter.
Furthermore, the upper computer is provided with a human-computer interface and is connected with the tested starter.
Further, the torque flange measures the torque output by the tested starter and transmits the torque to the upper computer.
Furthermore, the tested starter, the adaptive coupler, the torque flange, the rotating speed encoder and the main engine of the electric dynamometer are connected in a shafting mode.
The invention has the beneficial effects that:
in the starting process of various internal combustion engines and aircraft engines, a starter matched with the internal combustion engines is started firstly, the engine is equivalent to the load of the starter, and the starter outputs a rotating speed to drive the engine to start. After the engine is started, the starter stops working. The technical scheme of the invention can simulate the resistance of the main engine to the starter according to the working state when the starter and the main engine are used together, accurately control the rotating speed in the starting process, measure and record parameters such as torque, rotating speed and the like, test the performance of the starter, and solve the defects of control defects, environmental protection defects and the like in the prior art. The concrete points are as follows:
1. the four-quadrant running frequency converter is adopted to drive the main machine of the electric dynamometer to control the rotating speed, the electric dynamometer has the functions which are not possessed by an eddy current dynamometer, can be actively dragged and passively loaded, can better control the rotating speed within a required rotating speed interval, and has better control effect, stability and reliability;
2. the system is simple to install, a cooling water channel is not required to be designed, and a cooling water tower is not required to be built; the cost of circulating cooling water and the cost of maintaining the water channel are saved during working. Once input, once for all;
3. when the brake is loaded, the mechanical energy is converted into electric energy to be fed back to a power grid, the feed quality is high, the energy is recycled, and the electric energy is saved for users; heat generation consumption is not needed, and the harm of greenhouse effect is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a main machine side structure of an electric dynamometer;
FIG. 2 is a schematic diagram of the system;
FIG. 3 is a time line graph of the speed of the starter under test;
the labels in the figure are: 1. the device comprises an electric dynamometer main machine, 2, a rotating speed encoder, 3, a torque flange, 4, an adaptive coupler, 5, a transition support, 6, an installation base, 7, a tested starter, 8, an upper computer, 9, a closed-loop control lower computer, and 10, a four-quadrant operation frequency converter.
Detailed Description
The following specific examples are given to further clarify, complete and detailed the technical solution of the present invention. The present embodiment is a preferred embodiment based on the technical solution of the present invention, but the scope of the present invention is not limited to the following embodiments.
As shown in fig. 1 and 2, a control method of a starter load control system based on an electric dynamometer comprises a tested starter 7, an electric dynamometer main machine 1, a rotating speed encoder 2, a torque flange 3, an adaptive coupler 4, an upper computer 8, a closed-loop control lower computer 9 and a four-quadrant operation frequency converter 10; the test starter 7 is connected with one end of the adaptive coupling 4 through a shaft system, the other end of the adaptive coupling 4 is horizontally connected with the torque flange 3, the torque flange 3 is horizontally connected with the electric dynamometer main machine 1, the electric dynamometer main machine 1 is connected with the rotating speed encoder 2, and the test starter 7, the adaptive coupling 4, the torque flange 3 and the electric dynamometer main machine 1 are all arranged on the installation base 6;
the torque flange 3 is connected with an upper computer 8, the electric dynamometer main machine 1 is respectively connected with a closed-loop control lower computer 9 and a four-quadrant operation frequency converter 10, the closed-loop control lower computer 9 is respectively and electrically connected with a rotating speed encoder 2 and the four-quadrant operation frequency converter 10, and the upper computer 8 is electrically connected with the closed-loop control lower computer 9;
the control method comprises the following steps:
s1: on a human-computer interface of the upper computer 8, the system is controlled to start and stop, the real-time values of the rotating speed and the torque parameter are displayed, the real-time values of the rotating speed and the torque parameter are recorded and stored, the target rotating speed value of the lower computer 9 under closed-loop control is given, the alarming values of the rotating speed and the torque parameter are set according to the performance requirement of the tested starter 7, and the system can be actively controlled to stop when the real-time values of the rotating speed and the torque parameter reach the alarming values; thereby playing a role of protection;
s2: the upper computer 8 gives a signal for starting the electric dynamometer main engine 1 by a closed-loop control lower computer 9 in a communication mode, the closed-loop control lower computer 9 controls the four-quadrant operation frequency converter 10 to drive the electric dynamometer main engine 1 to start, after the electric dynamometer main engine 1 is started, the target rotating speed is given to be 0rpm, and the system is in a standby state;
s3: under the condition that the system is in a standby state, a tested starter 7 is started, meanwhile, the upper computer 8 gives a target rotating speed, and the upper computer 8 gives a target rotating speed of a closed-loop control lower computer 9 in a communication mode;
s4: after the tested starter 7 is started, the rotating speed of the tested starter 7 is transmitted to the end of the rotating speed encoder 2 at the speed ratio of 1:1, and the rotating speed measured by the rotating speed encoder 2 is the rotating speed of the tested starter 7; the closed-loop control lower computer 9 collects the rotating speed measured by the rotating speed encoder 2, controls the four-quadrant operation frequency converter 10 through closed-loop operation, and drives the electric dynamometer main machine 1 to reach the target rotating speed.
Further, as shown in fig. 2, the four-quadrant operation frequency converter 10 provides drive for the electric dynamometer main unit 1, and the electric dynamometer main unit 1 simulates a main engine to provide a load for the tested starter 7.
Further, the upper computer 8 is provided with a human-computer interface, and the upper computer 8 is connected with the tested starter 7.
Further, the torque flange 3 measures the torque output by the starter 7 to be tested and transmits the torque to the upper computer 8. An operator can control the tested starter 7 to reach the target rotating speed required by the test through the upper computer 8, and data are recorded in the time required by the test and stored in the upper computer 8.
Furthermore, the tested starter 7, the adaptive coupler 4, the torque flange 3, the rotating speed encoder 2 and the electric dynamometer main machine 1 are connected in a shafting mode.
Further, a transition support 5 is arranged between the tested starter 7 and the adaptive coupling 4. In the present invention, the transition support 5 or the non-transition support 5 can be selected according to the implementation of the specific embodiment.
Further, in the present invention, the actual main engine is in a state of constant inertia as the load of the starter 7 under test. In order to simulate this state, a time axis curve of the rotation speed required for the starting process is shown in fig. 3, a solid curve parallel to the time axis is the final target rotation speed of the starter 7 under test, and a diagonal solid curve is a transition process from 0rpm to the final target rotation speed. The transition process is equivalent to subdividing the rotating speed on the oblique line into a plurality of target rotating speed points, and the upper computer 8 sequentially gives the target rotating speed on the oblique line of the closed-loop control lower computer 9 within the transition time;
the solid curve does not fluctuate beyond the range of the dotted line throughout the test. When the eddy current dynamometer is used for testing, because the eddy current dynamometer can only be loaded passively, the eddy current dynamometer can control the tested starter 7 within the range of the curve of the dotted line when the rotating speed exceeds the curve trend of the dotted line above the rotating speed in the rotating speed rising process. However, if the rotating speed tends to be lower than the curve of the lower dotted line, the eddy current dynamometer cannot actively drag, the actual rotating speed may be lower than the curve of the lower dotted line, the test effect is poor, or the test fails. Because the system of the invention uses the four-quadrant running frequency converter 10 to drive the main machine 1 of the electric dynamometer, when the rotating speed has the trend lower than the curve of the dotted line below, the system can be actively dragged, the rotating speed is accurately controlled within the curve range of the dotted line, and the test is successfully completed.
Further, the torque flange 3 measures the torque output by the starter 7 to be tested and transmits the torque to the upper computer 8. An operator can control the tested starter 7 to reach the target rotating speed required by the test through the upper computer 8, and data are recorded in the time required by the test and stored in the upper computer 8;
after a test is finished, an operator is required to control the stop of the electric dynamometer main machine 1 through a human-computer interface of the upper computer 8, and then the power source of the tested starter 7 is cut off; in the test process, when the electric dynamometer main machine 1 is loaded, the mechanical energy of the tested starter 7 is converted into electric energy and transmitted to the four-quadrant operation frequency converter 10; the four-quadrant operation frequency converter 10 converts the electric energy into alternating current with the same phase and amplitude as the power grid, and feeds the alternating current back to the power grid for use by electric equipment on the power supply network, and the energy is consumed specially without adding energy consumption equipment. When feeding, the frequency converter is provided with an active rectification inverter ALM, the feeding synchronization performance is good, and the harmonic wave requirement meets the national power grid requirement.
In summary, in the control method of the starter load control system based on the electric dynamometer, in the starting process of various internal combustion engines and aircraft engines, the starter matched with the engine needs to be started, the engine is equivalent to the load of the starter, and the starter outputs a rotating speed to drive the engine to start. After the engine is started, the starter stops working. The technical scheme of the invention can simulate the resistance of the main engine to the starter according to the working state when the starter and the main engine are used together, accurately control the rotating speed in the starting process, measure and record parameters such as torque, rotating speed and the like, test the performance of the starter, and solve the defects of control defects, environmental protection defects and the like in the prior art.
In the invention, the four-quadrant running frequency converter is adopted to drive the main machine of the electric dynamometer to control the rotating speed, the four-quadrant running frequency converter has the functions which are not possessed by the electric eddy current dynamometer, can be actively dragged and passively loaded, better controls the rotating speed within a required rotating speed interval, and has better control effect, stability and reliability; the system is simple to install, a cooling water channel is not required to be designed, and a cooling water tower is not required to be built; the cost of circulating cooling water and the cost of maintaining the water channel are saved during working. Once input, once for all; when the brake is loaded, the mechanical energy is converted into electric energy to be fed back to a power grid, the feed quality is high, the energy is recycled, and the electric energy is saved for users; heat generation consumption is not needed, and the harm of greenhouse effect is reduced.
The principal features, principles and advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to explain the principles of the invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the invention as expressed in the following claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. A control method of a starter load control system based on an electric dynamometer, the system including a starter (7) under test, characterized in that: the device is characterized by also comprising an electric dynamometer host (1), a rotating speed encoder (2), a torque flange (3), an adaptive coupler (4), an upper computer (8), a closed-loop control lower computer (9) and a four-quadrant operation frequency converter (10); the device comprises a tested starter (7), a shaft system, a torque flange (3), an electric dynamometer main machine (1), a rotating speed encoder (2), a shaft system and a shaft coupling (4), wherein the shaft coupling is connected with one end of the adapter coupling (4), the other end of the adapter coupling (4) is horizontally connected with the torque flange (3), the torque flange (3) is horizontally connected with the electric dynamometer main machine (1), the electric dynamometer main machine (1) is connected with the rotating speed encoder (2), and the tested starter (7), the adapter;
the torque flange (3) is connected with an upper computer (8), the electric dynamometer main machine (1) is respectively connected with a closed-loop control lower computer (9) and a four-quadrant operation frequency converter (10), the closed-loop control lower computer (9) is respectively and electrically connected with a rotating speed encoder (2) and the four-quadrant operation frequency converter (10), and the upper computer (8) is electrically connected with the closed-loop control lower computer (9);
the control method comprises the following steps:
s1: on a human-computer interface of the upper computer (8), the system is controlled to start and stop, the real-time values of the rotating speed and the torque parameter are displayed, the real-time values of the rotating speed and the torque parameter are recorded and stored, the target rotating speed value of the lower computer (9) under closed-loop control is given, the alarm values of the rotating speed and the torque parameter are set according to the performance requirement of the tested starter (7), and when the real-time values of the rotating speed and the torque parameter reach the alarm values, the system can be actively controlled to stop;
s2: the upper computer (8) gives a signal for starting the electric dynamometer main machine (1) by a closed-loop control lower computer (9) in a communication mode, the closed-loop control lower computer (9) controls the four-quadrant operation frequency converter (10) to drive the electric dynamometer main machine (1) to start, after the electric dynamometer main machine (1) is started, a target rotating speed is given to be 0rpm, and the system is in a standby state;
s3: under the condition that the system is in a standby state, a tested starter (7) is started, meanwhile, a target rotating speed is given by an upper computer (8), and the target rotating speed of a lower computer (9) is given by the upper computer (8) in a closed-loop control mode;
s4: after the tested starter (7) is started, the rotating speed of the tested starter (7) is transmitted to the rotating speed encoder (2) end in a speed ratio of 1:1, and the rotating speed measured by the rotating speed encoder (2) is the rotating speed of the tested starter (7); the closed-loop control lower computer (9) collects the rotating speed measured by the rotating speed encoder (2), controls the four-quadrant operation frequency converter (10) through closed-loop operation, and drives the electric dynamometer main machine (1) to reach the target rotating speed.
2. The control method of the electric dynamometer-based starter load control system according to claim 1, wherein: and a transition support (5) is arranged between the tested starter (7) and the adaptive coupling (4).
3. The control method of the electric dynamometer-based starter load control system according to claim 1, wherein: the four-quadrant operation frequency converter (10) provides drive for the electric dynamometer main machine (1), and the electric dynamometer main machine (1) simulates a main engine to provide load for the tested starter (7).
4. The control method of the electric dynamometer-based starter load control system according to claim 1, wherein: the upper computer (8) is provided with a human-computer interface, and the upper computer (8) is connected with the tested starter (7).
5. The control method of the electric dynamometer-based starter load control system according to claim 1, wherein: and the torque flange (3) measures the torque output by the tested starter (7) and transmits the torque to the upper computer (8).
6. The control method of the electric dynamometer-based starter load control system according to claim 1, wherein: the tested starter (7), the adaptive coupler (4), the torque flange (3), the rotating speed encoder (2) and the electric dynamometer main machine (1) are connected in a shafting mode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911391976.5A CN111076938A (en) | 2019-12-30 | 2019-12-30 | Control method of starter load control system based on electric dynamometer |
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| CN201911391976.5A CN111076938A (en) | 2019-12-30 | 2019-12-30 | Control method of starter load control system based on electric dynamometer |
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Cited By (1)
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