CN111257000A - Intelligent engine starting endurance test control system and control method - Google Patents
Intelligent engine starting endurance test control system and control method Download PDFInfo
- Publication number
- CN111257000A CN111257000A CN202010370068.4A CN202010370068A CN111257000A CN 111257000 A CN111257000 A CN 111257000A CN 202010370068 A CN202010370068 A CN 202010370068A CN 111257000 A CN111257000 A CN 111257000A
- Authority
- CN
- China
- Prior art keywords
- starting
- engine
- rotating speed
- dead center
- endurance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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
- G01M15/02—Details or accessories of testing apparatus
-
- 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
- G01M15/04—Testing internal-combustion engines
- G01M15/042—Testing internal-combustion engines by monitoring a single specific parameter not covered by groups G01M15/06 - G01M15/12
- G01M15/046—Testing internal-combustion engines by monitoring a single specific parameter not covered by groups G01M15/06 - G01M15/12 by monitoring revolutions
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Automation & Control Theory (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention discloses an intelligent engine starting endurance test control system and a control method, wherein a singlechip in the control system controls a rotating speed signal relay, a fault indication Led module and a starting relay, the rotating speed signal relay controls the stop of an engine through a trigger, and the singlechip processes a rotating speed signal generated by the trigger and calculates the top dead center rotating speed and the idling rotating speed of the engine; the single chip microcomputer controls the starting and stopping of the starting motor through the starting relay; the oil level alarm switch provides fuel alarm information, the fault indication Led module is used for displaying different fault alarm types, and the starting power supply supplies power to the endurance controller and the starting motor. The invention adopts the transient rotating speed of the engine corresponding to the top dead center to judge whether the engine is successfully started, the transient rotating speed can more clearly judge whether the poor starting is caused by the fact that the piston does not exceed the top dead center due to insufficient power of the starting motor, various parameters in the starting and idling processes are automatically counted, and various faults are alarmed in real time.
Description
Technical Field
The invention relates to an engine starting technology, in particular to an intelligent engine starting endurance test control system and a control method.
Background
The starting motor is an important part of the engine, the failure of the starting motor can cause the engine to be incapable of starting, the poor continuous starting for many times can also cause the emission of the engine to exceed the standard, and the pollution degree of air is increased. Ensuring the reliability of an electric starter is a problem that must be addressed in engine design, and engine start endurance tests are one method to verify the reliability of engine start performance.
The existing electric starting endurance test device basically defines the power-on and power-off cycle time of a starting motor through a counter to realize automatic cycle starting tests for tens of thousands of times. The existing endurance test process lacks automatic monitoring of additional factors, and only depends on simple criteria such as checking whether the engine can be normally started after the endurance test is finished, whether the key size abrasion of the starting motor is in a range allowed by technical conditions, so that the starting endurance test is qualified, the extensive test method lacks scientific monitoring of the endurance starting process, lacks recording of endurance starting data, seriously influences the analysis of test results, and cannot scientifically guide the improvement of an electric starting system. The idling control of the engine is a difficult point of engine design, the performance of the engine is seriously influenced by unstable idling, the electric starting performance of the engine is closely related to the idling performance of the engine, and the idling changes along with different abrasion degrees of the engine. The existing engine endurance test device lacks monitoring of idle speed during the starting endurance test.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a control system which can effectively monitor each starting process of a durability test, automatically record relevant data of each starting process and accurately analyze test results.
The invention further aims to provide an intelligent engine starting endurance test control method.
The technical scheme is as follows: the control system comprises a starting power supply, a durable controller, an engine, a starting relay and an oil level alarm switch, wherein a single chip microcomputer, a rotating speed signal relay and a fault indication Led module are arranged in the durable controller; the single chip microcomputer controls the starting and stopping of the starting motor by controlling the starting relay; the oil level alarm switch is connected with the single chip microcomputer, the fault indication Led module is used for displaying different fault alarm types, and the starting power supply supplies power to the endurance controller and the starting motor.
The endurance controller controls the starting endurance test to automatically circulate according to the sequence of starting, idling, stopping and starting, and controls the fault indication Led module to flash according to different frequencies to display fuel oil low level alarm, starting power supply low voltage alarm, engine continuous starting failure alarm and engine maintenance alarm. The single chip microcomputer records the total starting times To, the idle qualified times IDL, the working success times Te of the starting motor, the idle value Vidle (To) of each starting process, the maximum upper dead center rotating speed Vmax (To) of the engine when only the starting motor provides power and the minimum rotating speed Vmin (To) of the whole endurance test process.
The arrays Vmax (to) and Vmin (to) are used for analyzing the endurance aging performance of the starter motor by designers and evaluating the rationality of each design parameter of the starter motor. And the array Vidle (to) is used for analyzing the change rule of the idle speed in the endurance test process and evaluating whether the electronic injection idle speed calibration parameters and the self-learning parameters are reasonable or not.
The engine top dead center rotation speed for judging whether the starter motor successfully starts the engine is a transient rotation speed, and the engine top dead center rotation speed for judging whether the engine runs smoothly after being started is an average rotation speed.
The calculation of the top dead center rotating speed of the engine is carried out in a single chip interrupt program, when the capture timer captures a trigger signal induced by the convex tooth of the induction disc corresponding to the top dead center of the engine in the trigger and activates the capture timer to interrupt, the interrupt program calculates a time interval T1 from the rotation of the induction disc from the previous convex tooth to the convex tooth, and the formula 10 is used for calculating the rotating speed of the top dead center of the engine6The engine top dead center speed is calculated by the/T1.
The calculation of the idling speed of the engine is carried out in an interrupt program of a single chip microcomputer, and the calculation method comprises the following steps: and recording the time Tidle taken by the induction disc to rotate for Z circles, and calculating the average idle speed Vidle of the engine according to the formula Vidle = Tidle/Z.
The endurance controller judges whether the engine is successfully started or not by calculating the top dead center rotating speed of the engine of each circle, and automatically cuts off the power supply of the starting motor after the engine is successfully started. The starting motor drives the engine crankshaft to rotate, a certain speed is given to the piston, and after the speed of the piston is larger than the lowest running rotating speed of the engine, the rotating speed of the top dead center of the engine has a large jump under the combined action of the mechanical energy converted after the mixed gas is ignited and the mechanical energy provided by the starting motor. The invention judges whether the engine is started successfully according to a formula T1>2 Tmax (T1 is the interval time between the convex tooth of the induction disc corresponding to the top dead center and the previous tooth, Tmax is the interval time between the two convex teeth of the induction disc corresponding to the maximum top dead center rotating speed of the engine during the period that the engine only depends on the starting motor to provide power). And (3) interrupting the program every time the induction disc rotates for 1 circle to judge whether the engine is started successfully or not, and when the induction disc rotates for 5 continuous circles, the power supply of the starting motor is cut off by the single chip microcomputer, and the engine enters an autonomous working mode.
The control method comprises the following steps:
(1) initializing a control system;
the control system is powered on, the singlechip is initialized, the oil mass, the starting power supply voltage, the engine are poor in continuous starting, and the engine maintenance alarm position is reset; and reading values of the total starting times To, the qualified idling times IDL and the successful starting motor working times Te which are completed before the engine is stopped last time from the single chip microcomputer EEPROM.
(2) Judging the endurance test conditions;
whether the fuel oil level is too low, whether the starting power supply voltage is too low and whether the total times of the endurance test are finished are judged, so that the problem that the starting success times are influenced due to the fact that fuel oil does not exist, the power supply voltage is too low and the like is avoided.
(3) Counting the success times of the electric starting work;
acquiring a time interval T1 between a convex tooth corresponding to the top dead center of each circle and a previous convex tooth before the starting motor is electrified and the engine is started successfully, and finding out a minimum value Tmin and a maximum value Tmax of T1; the method specifically comprises the following steps:
the endurance controller controls the starting motor to be electrified, if the engine is successfully started in time less than T1, the time interval T1 between the corresponding convex tooth and the previous convex tooth of the top dead center of each circle before the starting motor is electrified and the engine is successfully started is collected, and the minimum value Tmin and the maximum value Tmax of T1 are found out.
And if the engine is not started successfully within the time T1, acquiring the time value T1 of a convex tooth corresponding to the top dead center of each circle and a previous convex tooth within the time T1 of electrifying the starter motor, and finding out the minimum value Tmin and the maximum value Tmax of the T1.
Engine start success determination: and (4) continuously judging that the engine is successfully started if the number of the 5 circles T1 is more than 2 Tmax, and powering off the starting motor after adding 1 to the electric starting success time counter Te.
(4) Continuously starting the engine unsuccessfully and alarming;
in the step (3), if the engine is not started successfully within the time of t1 for 10 times continuously, the endurance controller stops starting the endurance test and drives the fault indication Led module to send out a continuous starting unsuccessful alarm.
(5) Detecting the load voltage of the starting power supply;
and (3) collecting the voltage of the starting power supply end at each circle of T1<2 Tmax, and if the electric starting is poor due to the fact that the voltage of the starting power supply is too low, stopping the starting endurance test by the endurance controller and driving the fault indication Led module to send out a low-voltage alarm.
(6) Counting the number of qualified idle times of the engine;
after the single chip microcomputer judges that the engine is started successfully, counting the time Tidle used by the induction disc to rotate the Z circle, and according to a formula: vidle = Tidle/Z calculation yields the average speed of rotation for Z revolutions after successful engine start. If the rotation speed is within the idle allowable range, the idle pass counter IDL = IDL +1, and the engine is idle for t2 time before step (7) is executed. And (7) if the rotating speed is not in the idle speed allowable range, directly executing the step.
(7) And stopping the engine for t3 time, wherein the total starting times To = To + 1.
(8) Writing the starting test related parameters into a storage unit through a single chip microcomputer;
when the engine is started for 10 times, the total starting times To, the idle qualified times IDL and the working success times Te of the starting motor, the values of the idle value array Vidle (To), the maximum top dead center rotating speed array Vmax (To) of the engine and the minimum top dead center rotating speed array Vmin (To) of the engine are written into a storage unit of the EEPROM, so that the loss of test data caused by accidents such as power failure is prevented.
(9) Judging whether the engine needs maintenance;
when To is an integral multiple of 1000, the endurance controller stops starting the endurance test and drives the Led fault indication module To send out a maintenance prompt.
The method comprises the following steps that two voltage signal acquisition are carried out in the primary starting process, the no-load voltage of a starting power supply is checked before a starting motor is electrified for the first time, and if the no-load voltage is smaller than a specified first threshold value, a single chip microcomputer drives an Led fault indication module to send out a low-voltage alarm of the starting power supply; and collecting the voltage of the starting power supply end for each circle of T1<2 Tmax for the second time, and if the voltage of the starting power supply is lower than a set second threshold value, stopping the starting endurance test and giving an alarm by the endurance controller.
Has the advantages that: compared with the prior art, the control system provided by the invention can be used for judging twice in each starting process, wherein the starting rotating speed of the engine is judged to be insufficient for one time, and whether the idle speed is qualified or not is judged for the second time. The engine starting rotating speed and the idling rotating speed adopt different calculation methods, the engine starting rotating speed is the engine top dead center transient rotating speed, the idling rotating speed is the average rotating speed, the compression resistance of the engine at the top dead center is the maximum, so the rotating speed at the point is the lowest in each circle, and the transient rotating speed can more clearly judge whether the engine is badly started because the piston does not exceed the top dead center due to insufficient power of a starting motor. The invention can eliminate the poor starting of the engine caused by external factors such as poor starting power supply, fuel oil and engine maintenance; the automatic shutdown is realized when the poor continuous starting occurs, which is beneficial to finding out the problems occurring in the test process as soon as possible and preventing the engine from being damaged in the subsequent test; the method is characterized in that a maximum rotating speed array Vmax (to) and a minimum rotating speed array Vmin (to) of an engine top dead center when a starting motor provides power in each starting process, an average idling array Vidle (to) in each successful starting process, a starting success frequency Te and an idling success frequency IDL are recorded, and practical test data provide powerful means for reasonable analysis of durability and idling calibration parameters of the engine starting motor and can guide designers to purposefully optimize relevant parameters of starting motor design and electronic fuel injection calibration according to the test data.
Drawings
FIG. 1 is a block diagram of the control system of the present invention;
FIG. 2 is a schematic diagram of the control system of the present invention;
FIG. 3 is a flowchart of a main program of a control method of the present invention;
FIG. 4 is a flowchart of a capture timer interrupt routine of the control method of the present invention;
FIG. 5 is a schematic illustration of engine crankshaft top dead center and trigger position;
FIG. 6 is a schematic diagram of a tachometer signal processing circuit of the present invention;
fig. 7 is a schematic diagram of a relay control circuit of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
The control system of the invention is provided with an external factor self-diagnosis program and a maintenance prompting program, so that the influence of the external factor on the test can be avoided to the maximum extent, and the engine is ensured to complete the whole endurance test in a good state. The starting durability test method has the advantages that the starting durability test method can judge whether the starting motor successfully starts the engine or not in each starting process twice, judge whether the idling speed is qualified or not in the second time, and can analyze the starting durability test process more objectively and comprehensively through data analysis in each starting process, so that data support is provided for analyzing faults occurring in the test process and optimizing calibration parameters of the idling condition of the electronic injection system.
The idling speed and the starting speed of the engine adopt different calculation methods, the starting speed of the engine is a transient speed, and the idling speed is an average speed. The invention calculates the engine speed corresponding to the upper dead point, which is a transient speed, judges whether the engine is successfully started in real time by judging whether the transient speed is continuously 5 times greater than 2 times of the maximum speed Tmax of the upper dead point when the starting motor provides power, is favorable for cutting off the power supply of the starting motor in time after the engine is successfully started, and prevents the damage of the starting motor caused by the reverse dragging of the starting motor by the engine. The statistics of the idle speed can clearly reflect the change trend of the idle speed of the engine in the whole durable starting process, and an electronic fuel injection calibration engineer can be guided to pertinently adjust calibration data of the idle working condition and self-learning parameters of an electronic fuel injection system through the analysis of the data, so that the electronic fuel injection system can be ensured to keep good idle speed stability in the whole service life of the engine.
As shown in fig. 1 and 2, the control system of the invention comprises a starting power supply 1, a durable controller 2, an engine, a starting relay 7 and an oil level alarm switch 8, wherein a single chip microcomputer, a fault indication Led module 3 and a rotating speed signal relay 4 are arranged in the durable controller, the engine comprises an induction disc 5, a trigger 6 and a starting motor 9, the single chip microcomputer is used for controlling the rotating speed signal relay, the fault indication Led module and the starting relay, the rotating speed signal relay controls the stop of the engine by controlling the trigger, and the durable controller controls the automatic cycle operation of a durable test. The single chip microcomputer of the endurance controller calculates the rotating speed of each circle of the top dead center of the engine when the starting motor provides power independently, and searches the maximum value and the minimum value of the rotating speed, if the engine cannot be started successfully within 10s, the starting motor is powered off, the engine is stopped for 20s, and the next starting cycle is started after the total starting times To is added with 1; if T1 is greater than 2 Tmax for 5 times within 10s, the engine is judged to be started successfully, and after the electricity starting success time counter Te is added with 1, the starting motor is powered off and enters an idle speed calculation stage; counting the time Tidle of 100 circles of rotation of the induction disc by the singlechip, calculating by using a formula Tidle/100 To obtain the idle speed of the engine, if the idle speed is not in a qualified range, stopping the engine for 20s, and starting the engine for the next starting cycle after adding 1 To the total starting times To; if the idling speed is in the qualified range, the engine stops after idling for 10s, and enters the next starting cycle after the qualified idling times IDL is added with 1 and the total starting times To is added with 1. The singlechip records the total starting times To, starting success times Te, idle qualified times IDL, Vmax (To) and Vmin (To) of each starting process and idle Vidle (To), and writes the Vmax and the Vmin (To) into a singlechip storage unit.
The alarm function includes: and the fuel oil shortage alarm is carried out, the endurance test is automatically stopped when the fuel oil level is low, and the condition that the cylinder of the engine is pulled or the oil pump is burnt out due to the fuel oil shortage is prevented.
Low-voltage alarm: when the terminal voltage of the starting motor is too low, the output torque and the rotating speed of the starting motor can be greatly reduced, and the engine can not be started normally; the starting motor is a high-power load, and if the capacity of a starting power supply is insufficient, the terminal voltage of the starting motor can be greatly reduced after large-current discharge occurs, so that the output rotating speed of the starting motor is influenced. Collecting the terminal voltage of a starting power supply before the starting motor is electrified, and when the terminal voltage of the no-load starting power supply is lower than a set first threshold value, directly not electrifying the starting motor, alarming and stopping the test; and after the starter motor is electrified, if T1<2 Tmax, acquiring the voltage of the starting power supply end of the ring, and if the voltage of the starting power supply is lower than a set second threshold value, stopping the starting endurance test and giving an alarm by the endurance controller.
And (3) continuously starting bad reminding: when the engine is not started for 10 times continuously, the endurance controller controls the engine starting endurance device to automatically stop and give an alarm, and reminds a designer to check the engine and the endurance test device and analyze the reason of poor starting.
Maintenance and maintenance alarming: when the starting times of the engine are integral multiples of 1000, the engine is automatically stopped, so that testers are reminded to carry out daily maintenance work such as carbon deposit removal, spark plug replacement and engine oil replacement, and the starting success rate statistics of the endurance test is avoided being influenced by the bad maintenance of the engine.
And (3) alarm mode: the failure indication Led module on the durable controller displays that the failure types are different and the flicker frequencies of the failure indication Led module are different.
As shown in fig. 3, the control method based on the control system includes the following steps (hereinafter, the numbers such as (1), (2), and (3).. said. (35) refer to the program step codes shown in fig. 3):
1. a durability test preparation stage;
(1) powering on the endurance test device; (2) initializing a single chip microcomputer; (3) reading the oil quantity, the voltage, the poor continuous starting, the maintenance alarm position, the total reset starting times To, the qualified idle times IDL and the successful starting motor working times Te; (4) judging whether the fuel oil level is too low, if so, executing steps (25) and (26) To write To, IDL, Te, Tmax (T0), Tmin (To) and Vidle (To) into a storage unit of an EEPROM, driving a fault indicator lamp To flash for 1s every 4s by a singlechip, and circularly working (oil shortage alarm); if the oil level is normal, executing step (5) To judge whether the no-load voltage of the starting power supply is larger than a specified value, if the voltage of the starting power supply is smaller than a first threshold value, executing steps (23) and (24) To, IDL, Te, Tmax (T0), Tmin (To), Vidle (To) To write into a storage unit of an EEPROM and a singlechip To drive a fault indicator lamp To flicker for 1s every 2s, and performing cyclic operation (low-voltage alarm); if the no-load voltage of the starting power supply voltage is normal, executing the step (33) to judge whether the total starting times are 50000 times, if the total test times are 50000 times, executing the step (34) to drive the fault indicator lamp to be on for a long time, and finishing the endurance test; if not, a durability test may be performed, and step (6) is performed.
2. In the process of the endurance test, a capture timer in an endurance controller interrupts a program work flow (hereinafter, serial numbers such as [1], [2], and [3]. said. [35] refer to a program step code shown in fig. 4);
(6) electrifying a starting motor; the starting motor drives the induction disc to rotate, the convex teeth on the induction disc induce a trigger signal on the trigger to activate an interrupt program of the capture timer, and the interrupt program starts to work as shown in fig. 4.
(a) Starting judgment flow for starting the engine;
[2] a trigger signal arrives; [3] writing a variable NEW at the current interrupt time; [4] front and rear two-tooth interval time T1= NEW-OLD; [5] OLD = NEW for the next tooth to calculate the corresponding two-tooth interval time T1; [6] judging whether the interruption is the first time of receiving the trigger signal and whether an engine starting zone bit RUN is 0; if yes, executing steps [7] and [8] to set the starting flag RUN to be 1, writing the rotation time T1 of the current tooth into T0 to be used for judging next tooth missing, and then returning to the step [1] to interrupt and wait; if RUN is not equal to 0, entering the process of judging missing teeth of the induction disc.
(b) An induction disc missing tooth judgment process (only if the missing tooth is found, the tooth corresponding to the upper dead point can be defined);
[9] if the trigger signal is not detected for the FIRST time, namely RUN =1, whether the single chip microcomputer successfully judges the missing teeth in the starting process is judged by judging whether the missing teeth flag LOST _ FIRST is equal to 1 or not; if not, executing the step [10] to judge whether the tooth is missing by the condition that the time for the current tooth to rotate is more than twice of the time for the previous tooth, if not, executing the steps [8] and [1], after the rotating time T1 of the current tooth is written into T0, waiting for the next interruption to judge the missing tooth again until the tooth is judged to be missing; if the tooth is missing, the steps [11], [12] and [13] are executed to set the missing tooth flag LOST _ FIRST to 1; defining the first tooth after the tooth missing as a 1 st tooth; tmin = T1, Tmax = T1 then go to step [1] to wait for the arrival of the next tooth, Tmin, Tmax: the two-tooth time interval corresponding to the lowest top dead center and the highest rotating speed when the engine is independently powered by the starter motor is initialized to be the current T1 and used for comparing the sizes of the next top dead center corresponding to the coming teeth to find out new Tmin and Tmax.
(c) Calculating the top dead center rotating speed of the engine;
when step [ 9)]After the missing tooth flag LOST _ FIRST =1, step [14] is executed]Judging whether idle speed calculation and start judgment completion flag bit EL in the starting process is equal to 1 or not, if EL =1, indicating that the start top dead center rotating speed calculation, the engine start success judgment and the idle speed calculation of the starting process are all completed, and turning to the step [1]]Waiting for the arrival of the next tooth; when EL =0, perform step [ 15%]Inquiring whether the starting success flag IGok is equal to 1; IGok =0, which indicates whether the engine is successfully started but not judged to be completed, the engine top dead center rotation speed calculation flow is entered, and the step is executed [21 ]]Judging whether the induction disc starts the next rotation by judging whether i is equal to 58, if i is equal to 58, executing the step [30 ]]i =0, preparing for counting the number of teeth of the next circle (the induction disc is uniformly distributed with 60-2 teeth, and when reaching the 58 th tooth, the number of teeth counter i needs to be cleared); if i ≠ 58, step [22 ] is executed]The tooth number counter is incremented by 1, and step [23 ] is executed]Judging whether the induction disc rotates to the 10 th tooth (the upper dead point corresponds to the 10 th tooth) or not; when i =10, i.e. the piston reaches top dead center, step [24 ] is performed]According to T1>Tmax, judging whether the engine is started successfully; t1 is the time required for the sense plate to rotate from tooth 9 to tooth 10 using equation 106The engine top dead center rotating speed at the moment is calculated by the method of/T1, in order to reduce the calculation amount of the interrupt program, the corresponding rotating speed is replaced by T1 in the program, and corresponding calculation is not carried out; if T1>Tmax, then execute step [ 25%]Adding 1 to a continuous ignition counter K; [26]The engine is continuously connected for 5 times T1>Tmax, then the engine start is judged to be successful, and step [27 ] is executed]、[28]、[29]Setting the successful starting flag IGok to be 1; clearing 0 the tooth number counter i, preparing for the idle counting crankshaft to rotate 100 circles (5800 teeth), returning 0 to the 5800 tooth rotation time timer Tidle, turning to and then to [1]]Interrupting for waiting, and then carrying out idle speed calculation; if [24 ]]T1 no more than 2 Tmax, which shows that the starter motor can not successfully start the engine, then step [31 ] is executed]A continuous ignition counter Kclear 0; then step [32 ] is performed]Comparing the current T1 value with Tmin if Tmin>T1, execute step [33]Assigns the current T1 to Tmin, and then performs step [34]Comparing the current T1 value with Tmax, if Tmin not more than T1, directly executing step [34]Performing Tmax compared to T1 if Tmax<T1, execute step [35]Assigning the current value of T1 to Tmax, if Tmax is not less than T1, jumping to step [1]]Wait for the next interrupt to arrive, via step [32 ]]、[33]、[34]、[35]The maximum rotating speed and the minimum rotating speed of the top dead center of the crankshaft in the period from the power-on of the starting motor to the time before the starting motor drives the engine to be started successfully are found, and after the starting process is finished, the maximum rotating speed and the minimum rotating speed are obtained in a main program (16) through a formula Vmax (to) =106(Tmax) and Vmin (to) =106and/Tmin calculating the maximum rotating speed and the minimum rotating speed of the top dead center of the engine when only the starting motor provides power in the starting process and putting the maximum rotating speed and the minimum rotating speed into the arrays Vmax (to) and Vmin (to). The arrays Vmax (to) and Vmin (to) store the maximum and minimum top dead center rotational speeds of each starting process in the whole starting durability test.
(d) Calculating the idle speed of the engine;
[15] if IGok =1 and EL =0 in [14], indicating that the engine has been successfully started but the idle speed calculation is not complete, the interrupt routine moves to the idle speed calculation, steps [16], [17] are executed, and the tooth number counter i is incremented by 1 each time the trigger signal is captured; determining if 5800 teeth full (58 teeth per revolution) have been counted; if the count of 100 circles is not reached, executing a step [18] to add the value of the 100 circles time timer Tidle to the current two-tooth interval time T1 and then put the Tidle into the step [1] to wait for the arrival of the next trigger signal, and executing a step [19] to carry out idle speed calculation by using a formula Vidle = Tidle/100 when the count of [17] is 5800; [20] and (5) after the idle calculation in the current starting process is finished, setting the idle calculation and starting judgment completion flag position EL of the current cycle to 1, and then turning to the step [1] to jump out and interrupt.
3. The control of the starting process by the main program;
(7) judging whether the running time of the starting motor reaches 10 s; if the time of the engine is not 10s, the step (8) is executed To judge whether the engine is started successfully by reading the IGok value, if the engine is not started successfully, the step (15) is executed To collect the starting power supply voltage through an AD conversion port of the single chip microcomputer and compare the starting power supply voltage with a preset second threshold value, if the starting power supply voltage is too low, the steps (23) and (24) are executed To write the To, IDL, Te, Tmax (T0) and Tmin (To), Vidle (To) into a storage unit of an EEPROM, the starting is not counted at this time, the single chip microcomputer drives a fault indicator lamp To flash for 1s every 2s, the cycle work (low-voltage alarm) is carried out, if the starting power supply voltage is normal, the step (7) is returned, whether the time of 10s is up or not is continuously judged, the engine is ignited.
(a) Starting a bad treatment process:
(27) if the timing of 10s is over, but the engine is still not started successfully, the starting motor is powered off; (28) continuously starting a bad counter N = N + 1; (29) total number of starts To = To + 1; (30) judging whether to start the fault for 10 times by the value of the continuous starting fault counter N; if the starting is bad for 10 times, executing steps (31) and (32) To, IDL, Te, Vmax (To), Vmin (To), Vidle (To) To be written into the storage unit of the EEPROM; the single chip microcomputer drives the fault indicator lamp to flicker for 0.5s every 1s, and the fault indicator lamp works circularly (starts bad alarm); if the engine is not continuously started, a continuous start failure counter N is set to 0 in step (10) after the engine is judged to be successfully started every time, and the judgment of the continuous start failure by N is ensured. If the number of times of poor continuous starting is less than 10, the operation step (16) calculates Vmax (To) and Vmin (To), then the step (17) is executed, whether the test number To is an integral multiple of 10 is judged, if the To is an integral multiple of 10, the step (18) is executed, To, IDL, Te, Vmax (To), Vmin (To), Vidle (To) and Vidle (To) are written into a storage unit of an EEPROM, and then the steps (19) and (20) are executed To judge that the To is an integral multiple of 1000, the singlechip drives the fault indicating lamp To flash for 2 times every 1s, flash for 0.3s every time, and the operation is circulated (engine maintenance alarm); if To is not an integral multiple of 10, step (21) is executed To set the start success flag IGok and the idle calculation and start judgment completion flag EL To 0, the engine start flag RUN To 0, the missing tooth flag LOST _ FIRS To 0, (22) the engine is stopped for 20s, and then the process goes To step (4) To start the next start test.
(b) Judging and processing the idle speed after the starting is successful;
if the IGok judges that the engine is started successfully in the step (8), executing a step (9) that a starting motor work success frequency counter Te = Te + 1; (10) continuously starting a bad counter N = 0; (11) judging whether the average rotating speed calculation of the engine of 100 circles is finished or not, and if not, circularly waiting; if so, performing step (12) for a total number of starts To = To + 1; (13) judging whether Vidle is in a range of +/-100 r/min of a specified idle speed, and if the idle speed is in a qualified range, executing a step (14) of an idle speed qualified counter IDL = IDL + 1; (15) the engine runs at idle speed for 10 s; then, the steps (16), (17), (19), (21) and (22) are executed to calculate Vmax (to) and Vmin (to) numbers, whether data are written into the EEPROM or not is judged, whether maintenance alarm is needed or not is judged, finally, an engine starting success flag IGok is set to 0, an idle speed calculation and starting judgment completion flag EL is set to 0, an engine starting flag RUN is set to 0, the engine stops running for 20s after a tooth missing flag LOST _ FIRS is set to 0, and then the process is shifted to the step (4) to start the next starting test. If the idle speed is not in the qualified range, the operation step (35) is executed, and then the steps (16), (17), (19), (21), (22) and (4) are executed after the engine is shut down.
The control method controls the cycle of the endurance test, and comprises the following specific implementation methods:
(a) setting the circulating operation time;
the singlechip timer completes the timing work of each cycle by matching with the main program.
The maximum continuous running time of the starter motor in the process of one-time starting is 10s, and the rotating speed of the engine does not meet the requirement after 10s, the starter motor stops working. And immediately stopping the work of the starting motor as long as the engine is judged to be successfully started within 10s, so as to prevent the engine from reversely dragging the starting motor. The purpose is as follows: the starting motor is prevented from working for a long time and being overheated. Prevent the power supply from discharging large current for a long time and damaging the starting power supply.
The idling operation of the engine for 10s is used for preventing the engine from stopping immediately after starting, so that carbon deposition of a spark plug is caused, and the subsequent starting of the engine is influenced.
And stopping the engine for 20s after the engine is started, cooling the engine and preventing damage caused by too frequent operation of the starter motor.
(b) An oil level alarm method;
an oil level alarm switch is installed in the fuel tank, when the oil level is lower than an alarm value, the oil level alarm switch outputs a grounding signal to an I/O port of the single chip microcomputer, and the single chip microcomputer enters a fault indicator lamp circulating flashing mode after reading the low level signal.
(c) A voltage alarm mode;
and the voltage value acquired by the singlechip is smaller than a preset first threshold value or a second threshold value, and then the fault indicator lamp enters a circulating flashing mode.
And the voltage signal acquisition is carried out twice in the primary starting process, so that the method is more reliable and more scientifically judges whether the electric quantity of the power supply is insufficient.
Before the starting motor is electrified, the no-load voltage of the starting power supply is checked for the first time, so that the starting motor is prevented from outputting insufficient power to cause poor starting under the condition of insufficient power of the starting power supply.
And the second time is that when the rotating speed of the starting motor with the crankshaft rotating is less than the lowest running rotating speed, the on-load voltage of the starting power supply is judged, because the starting motor is in a large-current working state, when the large current of the power supply discharges, if the capacity of the power supply drops seriously, the on-load voltage of the power supply drops greatly, and the output power of the starting motor drops.
(d) An engine speed acquisition method;
as shown in fig. 5, the sensing plate rotates with the crankshaft connecting rod, when the convex teeth on the sensing plate 5 pass through the trigger 6, a sine wave signal is induced on the trigger 6, and the signal is shaped into a square wave signal by the circuit shown in fig. 6. In fig. 6, R3, R4, R5, R6, R7, C16, and C17 form a filter circuit for an input signal, a MAX9924 chip converts a sine wave signal into a square wave signal, R8 is a pull-up resistor for an output signal, and C19 is a filter capacitor for the output signal. The square wave output signal (MAX 9924 pin 7) is connected to a capture timer of the single chip microcomputer, an interrupt program of the capture timer is triggered, and engine top dead center rotating speed and idling speed are calculated.
(e) A starting motor power-off method;
as shown in fig. 7, when the single chip microcomputer issues a starting motor power-off command, the port of the single chip microcomputer PTA0 outputs a high level, the optocoupler U3 controls the transistor Q1 to be turned off, the contact of the starting relay K1 is disconnected, and the starting motor is powered off.
(f) An engine shutdown method;
when a stop instruction sent by the singlechip is received, the rotating speed relay 4 controls the coil in the trigger to be disconnected, the electronic injection control unit cannot receive the rotating speed signal of the engine, the oil injection and ignition signals are automatically cut off, and the engine is stopped.
Claims (9)
1. An intelligent engine starting endurance test control system is characterized by comprising a starting power supply (1), an endurance controller (2), an engine, a starting relay (7) and an oil level alarm switch (8), wherein a single chip microcomputer, a fault indication Led module (3) and a rotating speed signal relay (4) are arranged in the endurance controller, the engine comprises an induction disc (5), a trigger (6) and a starting motor (9), the single chip microcomputer is used for controlling the rotating speed signal relay, the fault indication Led module and the starting relay, the rotating speed signal relay controls the engine to stop by controlling the trigger, meanwhile, the trigger transmits an engine rotating speed signal to the single chip microcomputer, and the single chip microcomputer calculates the top dead center rotating speed and the idling rotating speed of the engine and judges whether the engine is started successfully and runs stably; the single chip microcomputer controls the starting and stopping of the starting motor by controlling the starting relay; the oil level alarm switch is connected with the single chip microcomputer, the fault indication Led module is used for displaying different fault alarm types, and the starting power supply supplies power to the endurance controller and the starting motor.
2. The intelligent engine starting endurance test control system of claim 1, wherein the endurance controller controls the starting endurance test to automatically cycle according to the sequence of starting, idling, stopping and starting, and controls the fault indication Led module to flash at different frequencies to display a fuel low level alarm, a starting power low voltage alarm, an engine continuous starting bad alarm and an engine maintenance alarm; the single chip microcomputer records the total starting times To, the idle qualified times IDL, the working success times Te of the starting motor, the idle value Vidle (To) of each starting process, the maximum upper dead center rotating speed Vmax (To) of the engine when only the starting motor provides power and the minimum rotating speed Vmin (To) of the whole endurance test process.
3. The intelligent engine starting endurance test control system of claim 2, wherein the single chip microcomputer records the maximum and minimum values of the induction disc starting to rotate to a circle before the engine starting succeeds in each starting process and the top dead center rotating speed of the engine, and writes the arrays Vmax (to) and Vmin (to) for a designer to analyze the endurance aging characteristic of the starting motor and evaluate the reasonableness of each design parameter of the starting motor.
4. The intelligent engine start endurance test control system of claim 1, in which an engine top dead center speed for determining whether the starter motor successfully starts the engine is a transient speed, and an engine idle speed for determining whether the engine runs smoothly after starting is an average speed.
5. The intelligent engine starting endurance test control system of claim 4, in which the calculation of the top dead center rotational speed of the engine is performed in a one-chip interrupt routine, and when the capture timer captures a trigger signal induced in the trigger by the sensing disc tooth corresponding to the top dead center of the engine and activates the capture timer to interrupt, the interrupt routine calculates a time interval T1 from the rotation of the sensing disc from the previous tooth to the tooth, according to equation 106The engine top dead center speed is calculated by the/T1.
6. The intelligent engine starting endurance test control system of claim 4, in which engine idle speed calculation is performed in a single chip interrupt program by: and recording the time Tidle taken by the induction disc to rotate for Z circles, and calculating the average idle speed Vidle of the engine according to the formula Vidle = Tidle/Z.
7. The intelligent engine starting endurance test control system of claim 1, in which the endurance controller determines if the engine has started successfully by calculating the engine top dead center speed per revolution and automatically turns off the starter motor power supply; according to a formula T1>2 Tmax, the induction disc interrupts the program every time the induction disc rotates for 1 circle to judge whether the engine is started successfully, when the induction disc judges that the T1>2 Tmax for 5 continuous circles, the single chip microcomputer cuts off the power supply of the starting motor, and the engine enters an autonomous working mode; t1 is the interval time between the induction disc convex tooth and the previous tooth corresponding to the top dead center, Tmax is the interval time between the convex tooth corresponding to the maximum top dead center rotating speed of the engine and the previous convex tooth when the engine only depends on the starting motor to provide power.
8. An intelligent engine starting endurance test control method is characterized by comprising the following steps:
(1) the control system is powered on, the singlechip is initialized, and each alarm position is reset; reading values of total starting times To, idle qualified times IDL and starting motor work success times Te which are completed before the engine is stopped at the last time;
(2) judging whether the fuel oil level is too low, whether the starting power supply voltage is too low and whether the total times of the endurance test are finished;
(3) acquiring a time interval T1 between a convex tooth corresponding to the top dead center of each circle and a previous convex tooth before the starting motor is electrified and the engine is started successfully, and finding out a minimum value Tmin and a maximum value Tmax of T1; if the number of continuous 5 circles of T1 is greater than 2 Tmax, the engine is judged to be started successfully, and the starting motor is powered off after the electric starting success time counter Te is added with 1;
(4) in the step (3), if the engine is not started successfully within the time of t1 for 10 times continuously, the endurance controller stops starting the endurance test and drives the fault indication Led module to send out a continuous starting unsuccessful alarm;
(5) in the step (3), collecting the voltage of a starting power supply end at each circle of T1<2 x Tmax, and if the electric starting is poor due to the fact that the voltage of the starting power supply is too low, stopping a starting endurance test and giving an alarm by an endurance controller;
(6) calculating the average rotating speed in Z circles after the engine is started successfully; if the average rotating speed is in the idle speed allowable range, the idle qualified counter IDL = IDL +1, and the step (7) is executed after the engine is in idle operation for t2 time; if the average rotating speed is not in the idle speed allowable range, directly executing the step (7);
(7) stopping the engine for t3 time, wherein the total starting times To = To + 1;
(8) when the engine is started for 10 times, writing the values of the total starting times To, the idle qualified times IDL, the working success times Te of the starting motor, the idle value Vidle (To), the maximum upper dead center rotating speed Vmax (To) of the engine and the minimum upper dead center rotating speed Vmin (To) of the engine into a storage unit of a singlechip EEPROM;
(9) when To is an integral multiple of 1000, the endurance controller stops starting the endurance test and drives the Led fault indication module To send out a maintenance prompt.
9. The intelligent engine starting endurance test control method of claim 8, wherein two voltage signal acquisitions are performed in one starting process, the no-load voltage of the starting power supply is checked for the first time before the starting motor is powered on, if the no-load voltage is smaller than a specified first threshold, the single chip drives the Led fault indication module to send out a starting power supply low voltage alarm; and collecting the voltage of the starting power supply for each circle of T1<2 Tmax for the second time, and if the voltage of the starting power supply is lower than a set second threshold value, the endurance controller stops the starting endurance test and drives the Led fault indicating module to send out a low-voltage alarm of the starting power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010370068.4A CN111257000B (en) | 2020-05-06 | 2020-05-06 | Intelligent engine starting endurance test control system and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010370068.4A CN111257000B (en) | 2020-05-06 | 2020-05-06 | Intelligent engine starting endurance test control system and control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111257000A true CN111257000A (en) | 2020-06-09 |
| CN111257000B CN111257000B (en) | 2020-08-18 |
Family
ID=70951694
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010370068.4A Active CN111257000B (en) | 2020-05-06 | 2020-05-06 | Intelligent engine starting endurance test control system and control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111257000B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112557075A (en) * | 2020-11-27 | 2021-03-26 | 奇瑞汽车股份有限公司 | Starter durability test method and device |
| CN114609950A (en) * | 2022-03-29 | 2022-06-10 | 潍柴重机股份有限公司 | Control method and control system for automatic start and stop of diesel engine |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202869815U (en) * | 2012-05-23 | 2013-04-10 | 新大洲本田摩托有限公司 | Motorcycle starting durability test device |
| CN203217355U (en) * | 2013-04-28 | 2013-09-25 | 北京佩特来电器有限公司 | Centralized control collection system for starter stand endurance test |
| CN203223327U (en) * | 2013-05-07 | 2013-10-02 | 中国重汽集团成都王牌商用车有限公司 | Protection controller for automobile starting |
| CN203824760U (en) * | 2014-04-15 | 2014-09-10 | 水星海事技术(苏州)有限公司 | Portable outboard motor cycle start tester |
| US20150120247A1 (en) * | 2010-01-14 | 2015-04-30 | Kohler Co. | Diagnostic method for an engine-generator set |
| CN104793140A (en) * | 2015-04-29 | 2015-07-22 | 重庆长安汽车股份有限公司 | Endurance test system for automobile start motors |
| CN105020045A (en) * | 2015-07-27 | 2015-11-04 | 无锡硕卓电气科技有限公司 | Controller with CAN bus |
| CN107461268A (en) * | 2017-09-07 | 2017-12-12 | 贵州詹阳动力重工有限公司 | A kind of start-stop control system and control method of excavator BBG |
| CN110568356A (en) * | 2019-08-27 | 2019-12-13 | 上汽通用五菱汽车股份有限公司 | Automobile starter endurance test device and method |
| CN110671204A (en) * | 2019-09-30 | 2020-01-10 | 潍柴动力股份有限公司 | Engine system and control method of engine system |
-
2020
- 2020-05-06 CN CN202010370068.4A patent/CN111257000B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150120247A1 (en) * | 2010-01-14 | 2015-04-30 | Kohler Co. | Diagnostic method for an engine-generator set |
| CN202869815U (en) * | 2012-05-23 | 2013-04-10 | 新大洲本田摩托有限公司 | Motorcycle starting durability test device |
| CN203217355U (en) * | 2013-04-28 | 2013-09-25 | 北京佩特来电器有限公司 | Centralized control collection system for starter stand endurance test |
| CN203223327U (en) * | 2013-05-07 | 2013-10-02 | 中国重汽集团成都王牌商用车有限公司 | Protection controller for automobile starting |
| CN203824760U (en) * | 2014-04-15 | 2014-09-10 | 水星海事技术(苏州)有限公司 | Portable outboard motor cycle start tester |
| CN104793140A (en) * | 2015-04-29 | 2015-07-22 | 重庆长安汽车股份有限公司 | Endurance test system for automobile start motors |
| CN105020045A (en) * | 2015-07-27 | 2015-11-04 | 无锡硕卓电气科技有限公司 | Controller with CAN bus |
| CN107461268A (en) * | 2017-09-07 | 2017-12-12 | 贵州詹阳动力重工有限公司 | A kind of start-stop control system and control method of excavator BBG |
| CN110568356A (en) * | 2019-08-27 | 2019-12-13 | 上汽通用五菱汽车股份有限公司 | Automobile starter endurance test device and method |
| CN110671204A (en) * | 2019-09-30 | 2020-01-10 | 潍柴动力股份有限公司 | Engine system and control method of engine system |
Non-Patent Citations (2)
| Title |
|---|
| 刘玫: "发动机起动试验单片微机控制系统", 《江汉大学学报》 * |
| 陈钊等: "基于单片机的汽车起动性能检测系统 ", 《机床与液压》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112557075A (en) * | 2020-11-27 | 2021-03-26 | 奇瑞汽车股份有限公司 | Starter durability test method and device |
| CN114609950A (en) * | 2022-03-29 | 2022-06-10 | 潍柴重机股份有限公司 | Control method and control system for automatic start and stop of diesel engine |
| CN114609950B (en) * | 2022-03-29 | 2023-12-08 | 潍柴重机股份有限公司 | Control method and control system for automatic start-stop of diesel engine |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111257000B (en) | 2020-08-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111257000B (en) | Intelligent engine starting endurance test control system and control method | |
| CN102393733B (en) | Failure diagnosis method, fault diagnosis instrument and system thereof, new energy automobile | |
| CN1077690C (en) | Process for determining the state of charge of an accumulator | |
| CN105510828B (en) | A kind of vehicle startup system durability test device and its application method | |
| RU2256091C2 (en) | Method and device for internal combustion engine ignition | |
| CN1042766C (en) | Method and appratus for detecting storage battery | |
| CN101923144B (en) | Method and device for detecting locomotive storage batteries on line | |
| CN101639522B (en) | Equipment for diagnosing degradable state of secondary battery | |
| CN112909367B (en) | Storage battery activation nuclear capacity and repairing method | |
| CN111220915B (en) | Method and device for detecting low electric quantity of automobile storage battery | |
| CN205539387U (en) | Durability test of automobile staring system device | |
| CN111948458B (en) | Detection method and equipment of electric automobile insulation monitoring system | |
| CN113985085A (en) | Water meter working current test circuit and test method | |
| CN113671874B (en) | Intelligent water meter valve control method | |
| CN201060241Y (en) | Hall assembly testing apparatus | |
| CN102852693B (en) | Ignition coil failure diagnosis system and diagnosis method thereof | |
| CN102011726B (en) | Durability test system for oil pump and test method of test system | |
| CN85105778A (en) | Engine controlling unit | |
| US7246006B2 (en) | Method and systems for determining internal combustion engine cylinder condition | |
| CN113721539B (en) | Automatic control system and method for aeroengine lubricating oil interruption test | |
| CN2854617Y (en) | Optical signal tester of short-circuit and earth fault indicator | |
| CN201884262U (en) | Oil pump durability test system | |
| CN220772227U (en) | Information display instrument for engineering machinery equipment | |
| CN2674420Y (en) | Monitor for on-vehicle engine power | |
| CN114489024B (en) | New energy automobile centralized fault management control method and system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20201103 Address after: Jiangning District Lake Industrial Zone Shu Zhen Road Nanjing City, Jiangsu Province, Raj 211121 No. 518 Patentee after: Nanjing Jincheng Machinery Co.,Ltd. Patentee after: Jincheng Group Co.,Ltd. Address before: Raj road cooked Industrial Park Jiangning Lake in Nanjing city Jiangsu province 211121 No. 518 Patentee before: Nanjing Jincheng Machinery Co.,Ltd. |