CN107725031B - Indicator diagram acquisition device and method based on electric power and balance weight - Google Patents
Indicator diagram acquisition device and method based on electric power and balance weight Download PDFInfo
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Abstract
The invention relates to an indicator diagram acquisition device and method based on electric power and balance weight, which are arranged in an oil pumping unit control system and comprise an electric parameter acquisition module, a communication module, a dead point identification module and an industrial computer, wherein: the electric parameter acquisition module acquires the running current, voltage charge and power of the equipment through the primary detection element; the dead point identification module is used for measuring a bottom dead point in the crank motion of the oil pumping unit; the communication module transmits the data acquired by the electrical parameter acquisition module and the dead point identification module to the industrial computer, receives the instruction of the industrial computer and transmits the instruction to the power supply control module of the industrial computer; and the industrial computer receives the data uploaded by the electrical parameter acquisition module through the communication module, runs the indicator diagram calculation algorithm and outputs the indicator diagram. The invention replaces the conventional sensor measurement by calculation, does not need to install load and displacement sensors at the positions of the horse head, the walking beam and the like, prolongs the service life, reduces the difficulty and risk of operation and improves the maintainability of equipment.
Description
Technical Field
The invention relates to a comprehensive application technology of a pumping well, in particular to a device and a method for acquiring an indicator diagram based on electric power and balance weight.
Background
The suspension point indicator diagram is a closed graph taking load and displacement as coordinates. In oil field production, the graph is often used for judging the working state of a single oil well, calculating the oil production, judging the dynamic liquid level height and the like, and the indicator diagram of a plurality of oil wells can also be used for analyzing the liquid supply capacity of a block. The indicator diagram has great significance for the safe and stable production of the oil field, and is indispensable field data.
At present, the common method for measuring the indicator diagram requires that equipment is arranged on a walking beam or a suspension point so as to measure the position of the suspension point and the change of load. The equipment is high in manufacturing cost and has potential safety hazards in the installation process. In addition, the sensors generally adopt wired power supply and signal transmission, and even if an active and wireless signal transmission mode is adopted, batteries of the sensors need to be replaced regularly, so that the workload of later maintenance is greatly increased, and the use cost is also increased.
Disclosure of Invention
Aiming at the defects that the later maintenance workload of equipment is increased and potential safety hazards exist in the using process of an indicator diagram sensor in the prior art, the invention aims to solve the problem of providing an indicator diagram acquisition device and method based on electric power and balance weights, which can solve the potential safety hazards of indicator diagram sensor installation and the difficulty of later maintenance.
In order to solve the technical problems, the invention adopts the technical scheme that:
the invention relates to an indicator diagram acquisition device based on electric power and balance weight, which is arranged in a control system of an oil pumping unit and comprises an electric parameter acquisition module, a communication module, a dead point identification module and an industrial computer, wherein:
the electric parameter acquisition module acquires the running current, voltage charge and power of the equipment through the primary detection element;
the dead point identification module is used for measuring a bottom dead point in the crank motion of the oil pumping unit;
the communication module transmits the data acquired by the electrical parameter acquisition module and the dead point identification module to the industrial computer, receives the instruction of the industrial computer and transmits the instruction to the power supply control module of the industrial computer;
and the industrial computer receives the data uploaded by the electrical parameter acquisition module through the communication module, runs the indicator diagram calculation algorithm and outputs the indicator diagram.
The electric parameter acquisition module comprises a voltage transformer, a current transformer, a first amplifying circuit, a second amplifying circuit, a first active low-pass filter circuit, a second active low-pass filter circuit, a first active full-wave rectifying circuit, a second active full-wave rectifying circuit, a first resistance-capacitance filter circuit and a second resistance-capacitance filter circuit, wherein voltage signals acquired by the voltage transformer are transmitted to the output interface through the first amplifying circuit, the first active low-pass filter circuit, the first active full-wave rectifying circuit and the first resistance-capacitance filter circuit in sequence; the current signals of the power grid collected by the current transformer are transmitted to the output interface through the second amplifying circuit, the second active low-pass filter circuit, the second active full-wave rectifying circuit and the second resistance-capacitance filter circuit in sequence; and a phase difference detection circuit is arranged between a node between the first active low-pass filter circuit and the first active full-wave rectification circuit and a node between the second active low-pass filter circuit and the second active full-wave rectification circuit.
The indicator diagram is displayed by utilizing equipment through wired connection, or is transmitted to a remote terminal in a wireless transmission mode through the signal wireless transmitting module.
The communication module comprises an MCU module, an RS232 communication circuit, an RS485 communication circuit, an ADC input interface, a pulse capture input interface, a photoelectric isolation output interface and a W5500 network communication circuit, wherein the ADC data input interface, the pulse capture input interface and the photoelectric isolation input interface receive electric parameter signals collected by the electric parameter collection module and transmit the electric parameter signals to the MCU module, and the MCU module is connected with an upper computer through the photoelectric isolation output interface; other interfaces of the MCU module are in bidirectional communication connection with the upper computer through an RS232 communication circuit, an RS485 communication circuit and a W5500 network communication circuit.
The dead point identification module adopts a proximity switch, and the proximity switch is arranged on the crank.
The invention relates to a method for acquiring an indicator diagram acquisition device based on electric power and balance weight, which is characterized by comprising the following steps:
1) the industrial computer sends acquisition commands to the parameter acquisition module at regular time through the communication module, and the parameter acquisition module enters an acquisition state from a standby state;
2) a dead point identification module arranged on the crank is used for collecting the motion period of the crank, determining the bottom dead point of the crank motion, and controlling the sampling time and frequency of an electrical parameter collection module;
3) after the industrial computer receives the electric parameters uploaded by the electric parameter acquisition module, firstly, the displacement rule of the suspension point in one period is calculated, then, the load of the suspension point is calculated according to the electric parameters and the crank counterweight, and finally, the load and the displacement are corresponding to each other, so that the indicator diagram can be obtained.
In the step 2), the sampling time and frequency of the electrical parameter acquisition module are controlled as follows:
201) when the crank rotates to a bottom dead point for the first time and triggers the dead point identification module, the proximity switch sends a pulse signal to the electric parameter acquisition module, and the electric parameter acquisition module starts timing;
202) when the crank rotates to the bottom dead center for the second time, the proximity switch sends a pulse signal to the electrical parameter acquisition module again, and the electrical parameter acquisition module determines sampling time and sampling frequency according to the interval of two pulses;
203) the electric parameter acquisition module acquires the electric parameters according to the calculated sampling frequency and stores the acquired electric parameters of one stroke in a memory of the electric parameter acquisition module.
In step 3), calculating a displacement rule of the suspension point in one period, including:
301) collecting mechanical structure data of an oil well, wherein the mechanical structure data comprises crank radius, connecting rod length, walking beam rear arm length, walking beam front arm length, base rod length, structure unbalance weight, balance weight gravity center distance, crank weight, crank gravity center distance and base rod projection length;
302) according to the geometric structure of the four connecting rods of the oil pumping unit, the angular displacement theta of the crank is positive clockwise from the 12 o' clock position; the reference angle of the crank, the reference angle of the connecting rod and the reference angle of the walking beam are all OO1For reference, the counterclockwise direction is positive; the vertical direction of the horse head movement direction is positive, and the following parameters are calculated by the following formula:
reference angle of crank:
connecting rod reference angle: theta2＝2π-θ+α
Wherein R is the crank radius; p is the length of the connecting rod; c is the length of the rear arm of the walking beam; k is the length of the base rod; i is the projection length of the base rod; l is the distance from the axle center of the crank pin to the support center of the walking beam; beta is an included angle between the base rod and a connecting line from the axis of the crank pin to the support center of the walking beam; chi is an included angle from a connecting line from the axle center of the crank pin to the center of the beam support to the rear arm of the beam; phi is an included angle from the base rod to the rear arm of the walking beam; theta is an included angle from the 12 o' clock direction to the radius R of the crank;
by the angle, the length A of the front arm of the walking beam and the angle theta are determined4Calculating the motion track of the suspension point:
Sc＝Aθ4
wherein ScThe donkey head suspension point displacement is shown, and A is the length of the front arm of the walking beam;
303) the suspension point load is calculated by the following formula:
wherein T isnIs a crank shaftNet torque, W is the suspension point load, B is the structural unbalance weight, Q is the balance weight, V is the balance weight center distance, Q is the crank weight, r is the crank center distance, theta is the crank angle,
is a torque factor;
in the above formula, the balance weight Q, the balance weight center distance V, the crank weight Q, the crank center distance r and the balance weight center distance V are determined by oil well mechanical parameters;
304) and adjusting the time sequence of the electrical parameters acquired by the electrical parameter acquisition module, corresponding the displacement time to the load time, taking the displacement as an abscissa and the suspension point load as an ordinate, and corresponding the sequence of the load sample and the displacement sample to finish calculating the indicator diagram.
Step 303) crankshaft net torque TnCalculated by the following formula:
Tn＝Tno×ηbelt×ηgb
wherein P ismotorIs the instantaneous power of the motor, rot is the motor speed, ibeltIs the ratio of the diameter of the belt pulley to the diameter of the motor wheel, igbη for reduction gear ratiobeltFor belt drive efficiency, ηgbThe transmission efficiency of the reduction gearbox is improved;
the motor speed is calculated by the following formula:
rot＝igb×ibelt×N
wherein N is the number of strokes.
Torque factor in step 303)
Calculated by the following formula:
to pair
Carrying out treatment;
wherein R is the radius of a crank, C is the length of a rear arm of a walking beam, A is the length of a front arm of the walking beam, K is the length of a base rod, P is the length of a connecting rod, α is a reference angle of the crank, β 1 is an included angle from the connecting rod to the rear arm of the walking beam, and theta 2 is an included angle from the radius of the crank to L;
is the angle from K to C.
The invention has the following beneficial effects and advantages:
1. according to the method and the device for generating the indicator diagram based on the electrical parameters, the suspension point indicator diagram is calculated by the electrical parameters according to the motor power and the torque generated by the crank and the motion rule of the four-bar linkage mechanism in the working process of the oil pumping unit, the calculation replaces the conventional sensor measurement, and a load and displacement sensor does not need to be installed at the positions of a horse head, a walking beam and the like, so that the service life is prolonged, the difficulty and the risk of operation are reduced, the maintainability of equipment is improved, and the production cost of an oil field is reduced to a great extent.
2. The invention adopts the self-developed electric parameter acquisition module, adopts a two watt method to calculate the power of the motor, has quick wiring mode, and adds the power supply detection control module in the industrial computer to ensure the stability of the system; the indicator diagram accessible that calculates is looked up, the mode that data were derived is collected at the scene, also can pass through mobile device APP through modes such as data teletransmission, the SMS, and the computer carries out remote collection, and collection process convenient and fast can realize carrying out real time monitoring to the state of oil well.
Drawings
FIG. 1 is a topology diagram of the architecture of the present invention;
FIG. 2 is a flow chart of the present invention;
FIG. 3 is a schematic view of a four bar linkage according to the present invention;
FIG. 4 is a block diagram of an electrical parameter acquisition module according to the present invention;
FIG. 5 is a block diagram of a communication module according to the present invention;
FIG. 6 is an illustration of an indicator diagram obtained by applying the method of the present invention.
Detailed Description
The invention is further elucidated with reference to the accompanying drawings.
As shown in fig. 1, the indicator diagram collecting device based on electric power and balance weight of the present invention comprises an electric parameter collecting module, a communication module, a dead point identification module, an industrial computer and an industrial computer power supply control module, wherein:
the electric parameter acquisition module acquires the running current, voltage charge and power of the equipment through the primary detection element;
the dead point identification module is used for measuring a bottom dead point in the crank motion of the oil pumping unit;
the communication module transmits the data acquired by the electrical parameter acquisition module and the dead point identification module to the industrial computer, receives the instruction of the industrial computer and transmits the instruction to the power supply control module of the industrial computer;
the industrial computer receives the data uploaded by the electrical parameter acquisition module through the communication module, runs the indicator diagram calculation algorithm and outputs the indicator diagram;
and the industrial computer power supply control module monitors the working state of the industrial computer according to the communication condition between the industrial computer and the communication module, and executes power failure restart when the industrial computer crashes.
The invention also has a signal wireless transmitting module, the indicator diagram is displayed by using equipment through wired connection, or the indicator diagram is transmitted to a remote terminal through the signal wireless transmitting module in a wireless transmitting mode.
In the embodiment, the dead point identification module adopts a proximity switch, and the proximity switch is arranged on the crank; as shown in fig. 4, the electrical parameter collecting module includes a voltage transformer, a current transformer, a first amplifying circuit, a second amplifying circuit, a first active low-pass filter circuit, a first active full-wave rectifier circuit, a first resistance-capacitance filter circuit, and a second resistance-capacitance filter circuit, wherein a voltage signal collected by the voltage transformer is transmitted to the output interface through the first amplifying circuit, the first active low-pass filter circuit, the first active full-wave rectifier circuit, and the first resistance-capacitance filter circuit in sequence; the current signals of the power grid collected by the current transformer are transmitted to the output interface through the second amplifying circuit, the second active low-pass filter circuit, the second active full-wave rectifying circuit and the second resistance-capacitance filter circuit in sequence; and a phase difference detection circuit is arranged between a node between the first active low-pass filter circuit and the first active full-wave rectification circuit and a node between the second active low-pass filter circuit and the second active full-wave rectification circuit.
As shown in fig. 5, the communication module includes an MCU module, an RS232 communication circuit, an RS485 communication circuit, an ADC input interface, a pulse capture input interface, a photoelectric isolation output interface, and a W5500 network communication circuit, wherein the ADC data input interface, the pulse capture input interface, and the photoelectric isolation input interface receive the electrical parameter signal collected by the electrical parameter collection module and transmit the electrical parameter signal to the MCU module, and the MCU module is connected to the upper computer through the photoelectric isolation output interface; other interfaces of the MCU module are in bidirectional communication connection with the upper computer through an RS232 communication circuit, an RS485 communication circuit and a W5500 network communication circuit. In this embodiment, a UART communication circuit may be further provided to reserve an interface for connecting to other devices.
The invention adopts the self-developed electric parameter acquisition module, adopts the two watt method to calculate the power of the motor, and has quick wiring mode; a power supply detection control module is added to the industrial computer, so that the stability of the system is ensured; the indicator diagram accessible that calculates is looked up, the mode that data were derived is collected at the scene, also can pass through mobile device APP through modes such as data teletransmission, the SMS, and the computer carries out remote collection, and collection process convenient and fast can realize carrying out real time monitoring to the state of oil well.
As shown in fig. 2, the method for acquiring an indicator diagram acquisition device based on electric power and balance weight of the present invention comprises the following steps:
step 1), an industrial computer sends acquisition commands to a parameter acquisition module at regular time through a communication module, and the parameter acquisition module enters an acquisition state from a standby state;
in the step 2), the sampling time and frequency of the electrical parameter acquisition module are calculated as follows:
201) when the crank rotates to a bottom dead point (namely the lowest point in the operation process of the oil well crank) for the first time and triggers the dead point identification module, the proximity switch sends a pulse signal to the electric parameter acquisition module, the electric parameter acquisition module starts timing and records the time t1；
202) When the crank rotates to the bottom dead center for the second time, the proximity switch sends a pulse signal to the electric parameter acquisition module again, and at the moment, the electric parameter acquisition module records the moment t2According to the interval t of two pulses2-t1Determining a sampling time and a sampling frequency;
203) the electric parameter acquisition module acquires the electric parameters according to the calculated sampling frequency and stores the acquired electric parameters of one stroke in a memory of the electric parameter acquisition module;
in the step, the electrical parameter acquisition module acquires electrical parameters according to the calculated sampling frequency, and the data acquisition mode is carried out according to the following formula; the indicator diagram to be calculated in the invention is formed by 300 points in one stroke, therefore, the electrical parameter in one stroke should also comprise 300 points; and in order to avoid the influence caused by noise and abnormal points, each point is obtained by the average value of 100 points, as shown in the following formula:
wherein x isiIs the ith electrical parameter, n, in a strokejIs xiElectrical parameters in the vicinity of the point, i being the electrical parameter number within a stroke, j being xiElectrical parameter numbers near the points;
204) the displacement starting point is the bottom dead center of the horse head, the crank is located at the top dead center at the moment, but the electrical parameters are collected from the bottom dead center of the crank, and the displacement and the load have half stroke time difference, so that the time sequence of the collected electrical parameters is adjusted.
205) And sending the electrical parameters to the industrial computer through the communication module.
In step 3), calculating a displacement rule of the suspension point in one period, including:
301) collecting mechanical structure data of an oil well, wherein the mechanical structure data comprises crank radius, connecting rod length, walking beam rear arm length, walking beam front arm length, base rod length, structure unbalance weight, balance weight gravity center distance, crank weight, crank gravity center distance and base rod projection length;
302) according to the geometry of the four-bar linkage of the pumping unit, as shown in fig. 3, the angular displacement theta of the crank is positive clockwise from the 12 o' clock position; reference angles of the crank, the connecting rod and the walking beam
With OO1 as a reference, positive counterclockwise; the vertical direction of the horse head movement direction is positive, and the following parameters are calculated by the following formula:
reference angle of crank:
connecting rod reference angle: theta2＝2π-θ+α
Wherein R is the crank radius, m; p is the length of the connecting rod, m; c is the length of the rear arm of the walking beam, m; k is the length of the base rod, m; i is the projection length of the base rod, m; l is the distance from the axle center of the crank pin to the support center of the walking beam, m; beta is an included angle, rad, from the base rod to the connecting line from the axis of the crank pin to the support center of the walking beam; chi is an included angle, rad, from a connecting line from the axis of the crank pin to the center of the beam support to the length C of the rear arm of the beam; phi is the included angle from the base rod to the rear arm of the walking beam, rad; theta is an included angle from 12 o' clock direction to the radius R of the crank, rad;
and calculating the motion trail of the suspension point according to the length A of the front arm of the walking beam and the angle theta 4 through the angles:
Sc＝Aθ4
wherein Sc is the mule head suspension point displacement in m; a is the length of the front arm of the walking beam in m;
303) the suspension point load is calculated by the following formula:
wherein T isnIs the crankshaft net torque in kg · m; w is the suspension point load in kg; b is a unit kg without balancing weight; q is the weight of the balance block in kg; r is the gravity center distance of the balance weight in m; q is crank weight in kg; r is the crank center of gravity distance in m; theta is the crank angle in degrees;
is a torque factor, dimensionless;
in the above formula, the counterweight weight Q, the counterweight center of gravity distance R, the crank weight Q, the crank center of gravity distance R, and the counterweight center of gravity distance R are determined by the oil well mechanical parameters (determined from oil well mechanical drawings);
step 303) crankshaft net torque TnCalculated by the following formula:
Tn＝Tno×ηbelt×ηgb
wherein P ismotorIs the instantaneous power of the motor, rot is the motor speed, ibeltIs the ratio of the diameter of the belt pulley to the diameter of the motor wheel, igbη for reduction gear ratiobeltFor belt drive efficiency, ηgbThe transmission efficiency of the reduction gearbox is improved;
because the oil well adopts a counterweight design, the motor has the slip ratio of a conventional motor in the whole stroke, namely the slip ratio is less than 5%, the rotating speed can be regarded as basically unchanged, the rotating speed of the crank is considered to be equal to a constant, and the rotating speed of the motor can be calculated by the following formula:
rot＝igb×ibelt×N
wherein N is the number of strokes.
Calculating the power of the motor by adopting a two-watt method in the step 303):
Pmotor＝P1+P2
wherein U isabAb phase voltage between the two phases, unit V; u shapecbIs the phase voltage between the cb two phases, unit V; i isabAb phase current between two phases, unit a; i iscbPhase current between cb two phases, unit a;
is the power factor of the ab-phase,
is the power factor of the cb phase.
Torque factor in step 303)
Calculated by the following formula:
due to the fact that
Is a sine-like function with two zero points and is included in the formula for calculating the suspension point load W
Reciprocal of (1), therefore, need to be
And (3) processing:
wherein R is the radius of the crank, C is the length of the rear arm of the walking beam, m, A is the length of the front arm of the walking beam, m, K is the length of the base rod, m, P is the length of the connecting rod, m, α is the reference angle of the crank, rad, β1Is the included angle from the connecting rod to the rear arm of the walking beam, rad; theta2Is from the radius R of the crank to the axis of the crank pin to the walking beamSupporting the included angle of the central connecting line, rad; phi is the included angle from the base rod to the rear arm of the walking beam, rad;
can be effectively avoided after the treatment
And the suspension point load near the zero point fluctuates too much.
The crank angle θ in step 303) can be calculated by the following equation:
wherein t is time; n is the number of strokes.
Step 4): the indicator diagram acquired by the method can be displayed by using equipment through wired connection, and can also be transmitted to a remote terminal including a mobile phone short message, a mobile device APP, a computer and the like through a signal wireless transmitting module.
As shown in fig. 6, it is a schematic diagram obtained by the above steps in this embodiment.
Claims (4)
1. A collecting method of an indicator diagram collecting device based on electric power and balance weight is characterized by comprising the following steps:
1) the industrial computer sends acquisition commands to the parameter acquisition module at regular time through the communication module, and the parameter acquisition module enters an acquisition state from a standby state;
2) a dead point identification module arranged on the crank is used for collecting the motion period of the crank, determining the bottom dead point of the crank motion, and controlling the sampling time and frequency of an electrical parameter collection module;
3) after receiving the electric parameters uploaded by the electric parameter acquisition module, the industrial computer firstly calculates the displacement rule of the suspension point in one period, then calculates the load of the suspension point according to the electric parameters and the crank counterweight, and finally corresponds the load and the displacement to obtain an indicator diagram;
in step 3), calculating a displacement rule of the suspension point in one period, including:
301) collecting mechanical structure data of an oil well, wherein the mechanical structure data comprises crank radius, connecting rod length, walking beam rear arm length, walking beam front arm length, base rod length, structure unbalance weight, balance weight gravity center distance, crank weight, crank gravity center distance and base rod projection length;
302) according to the geometric structure of the four connecting rods of the oil pumping unit, the angular displacement theta of the crank is positive clockwise from the 12 o' clock position; the reference angle of the crank, the reference angle of the connecting rod and the reference angle of the walking beam are all OO1For reference, the counterclockwise direction is positive; the vertical direction of the horse head movement direction is positive, and the following parameters are calculated by the following formula:
reference angle of crank:
connecting rod reference angle: theta2＝2π-θ+α
Wherein R is the crank radius; p is the length of the connecting rod; c is the length of the rear arm of the walking beam; k is the length of the base rod; i is the projection length of the base rod; l is the distance from the axle center of the crank pin to the support center of the walking beam; beta is an included angle between the base rod and a connecting line from the axis of the crank pin to the support center of the walking beam; chi is an included angle from a connecting line from the axle center of the crank pin to the center of the beam support to the rear arm of the beam; phi is an included angle from the base rod to the rear arm of the walking beam; theta is an included angle from the 12 o' clock direction to the radius R of the crank;
by the angle, the length A of the front arm of the walking beam and the angle theta are determined4Calculating the motion track of the suspension point:
Sc＝Aθ4
wherein ScThe donkey head suspension point displacement is shown, and A is the length of the front arm of the walking beam;
303) the suspension point load is calculated by the following formula:
wherein T isnIs the net torque of the crankshaft, W is the suspension point load, B is the structure non-balance weight, Q is the balance weight, V is the balance weight gravity center distance, Q is the crank weight, r is the crank gravity center distance, theta is the crank angle,
is a torque factor;
in the above formula, the balance weight Q, the balance weight center distance V, the crank weight Q, the crank center distance r and the balance weight center distance V are determined by oil well mechanical parameters;
304) adjusting the time sequence of the electrical parameters acquired by the electrical parameter acquisition module, corresponding the displacement time to the load time, taking the displacement as an abscissa and the suspension point load as an ordinate, and corresponding the sequence of the load sample and the displacement sample to finish calculating the indicator diagram;
indicator diagram collection system based on electric power and balance weight installs in beam-pumping unit control system, including electric parameter acquisition module, communication module, dead point identification module and industrial computer, wherein:
the electric parameter acquisition module acquires the running current, voltage charge and power of the equipment through the primary detection element;
the dead point identification module is used for measuring a bottom dead point in the crank motion of the oil pumping unit;
the communication module transmits the data acquired by the electrical parameter acquisition module and the dead point identification module to the industrial computer, receives the instruction of the industrial computer and transmits the instruction to the power supply control module of the industrial computer;
and the industrial computer receives the data uploaded by the electrical parameter acquisition module through the communication module, runs the indicator diagram calculation algorithm and outputs the indicator diagram.
2. The acquisition method of the indicator diagram acquisition device based on electric power and balance weight according to claim 1, wherein the sampling time and frequency of the electric parameter acquisition module in the step 2) are controlled as follows:
201) when the crank rotates to a bottom dead point for the first time and triggers the dead point identification module, the proximity switch sends a pulse signal to the electric parameter acquisition module, and the electric parameter acquisition module starts timing;
202) when the crank rotates to the bottom dead center for the second time, the proximity switch sends a pulse signal to the electrical parameter acquisition module again, and the electrical parameter acquisition module determines sampling time and sampling frequency according to the interval of two pulses;
203) the electric parameter acquisition module acquires the electric parameters according to the calculated sampling frequency and stores the acquired electric parameters of one stroke in a memory of the electric parameter acquisition module.
3. The method for collecting an indicator diagram collecting device based on electric power and balance weight as claimed in claim 1, wherein the crank shaft net torque T in step 303) isnCalculated by the following formula:
Tn＝Tno×ηbelt×ηgb
wherein P ismotorIs the instantaneous power of the motor, rot is the motor speed, ibeltIs the ratio of the diameter of the belt pulley to the diameter of the motor wheel, igbη for reduction gear ratiobeltFor belt drive efficiency, ηgbThe transmission efficiency of the reduction gearbox is improved;
the motor speed is calculated by the following formula:
rot＝igb×ibelt×N
wherein N is the number of strokes.
4. The method for collecting an indicator diagram collecting device based on electric power and balance weight as claimed in claim 1, wherein the torque factor in step 303) is
Calculated by the following formula:
to pair
Carrying out treatment;
wherein R is the radius of a crank, C is the length of a rear arm of a walking beam, A is the length of a front arm of the walking beam, K is the length of a base rod, P is the length of a connecting rod, α is a reference angle of the crank, β 1 is an included angle from the connecting rod to the rear arm of the walking beam, and theta 2 is an included angle from the radius of the crank to L;
is the angle from K to C.
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