CN1119640C - Measurement of engine mechanical efficiency and back drawing test system - Google Patents
Measurement of engine mechanical efficiency and back drawing test system Download PDFInfo
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- CN1119640C CN1119640C CN00133212A CN00133212A CN1119640C CN 1119640 C CN1119640 C CN 1119640C CN 00133212 A CN00133212 A CN 00133212A CN 00133212 A CN00133212 A CN 00133212A CN 1119640 C CN1119640 C CN 1119640C
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/05—Testing internal-combustion engines by combined monitoring of two or more different engine parameters
Abstract
The present invention relates to a mechanical efficiency measurement and back drawing test system for an engine. The present invention comprises a computer, an AC variable frequency speed control motor, a frequency governor, an intelligence shaft coupling, a torque rotary speed power meter, a cooling water temperature and machine oil temperature monitor, an engine fuel cutter, a brake/dynamometer, a brake/dynamometer controller, a shaft coupling, a power supply control cabinet, etc. which are combined and connected like an accompanying drawing. The present invention has the advantages of large dragging power, wide regulating range, high speed regulation accuracy, high response speed, high automation degree, low cost, etc. The present invention can be used for measuring effective power, and can be used for measuring mechanical loss power and mechanical efficiency, so the present invention has wide use and is one of the more important measures for engine test at present.
Description
Technical field
The invention belongs to the Engine Block Test technology, particularly a kind of measurement of engine mechanical efficiency and towing astern experimental technique are specifically related to a kind of measurement of engine mechanical efficiency and back drawing test system of ac variable frequency speed regulation transmission of electromechanical integration.
Background technology
In prior art, because dynamometer machines such as waterpower and current vortex all can not the towing astern engine, thereby the measurement of test of engine towing astern and mechanical efficiency thereof, nearly all on the electric dynamometer of import, carry out at present.But because electric dynamometer is with high content of technology, domestic still do not have production, and import price is very expensive, and domestic at present only seldom unit have.Will do above-mentioned experiment with measuring for most of units, the unit that only goes to have electric dynamometer does experiment.This spends all very big on human and material resources, financial resources, and is having a strong impact on the research and development of engine.
Employing adds the motor towing astern by torque gauge, also can be used for above-mentioned experiment with measuring, and two kinds of schemes are arranged at present: the one, and the DC motor speed-regulating transmission scheme.For example Beijing Institute of Technology adopts 7.5kW/110V direct current generator, TDGC-3/0.5 type pressure regulator and TR-5 torque rotary speed sensor and supporting Displaying Meter, is used for the friction of FG-1 type air-cooled diesel engine, wear test etc.Its advantage is that the DC speed regulation performance is good, and precision and rapidity can both meet the demands, and shortcoming is that the brush and the commutator of direct current generator is the consumable accessory structure, has limited its environment for use, has particularly limited the raising of maximum speed and capacity.As the direct current generator more than the 20kW, maximum speed is lower than 3600r/min, and needs often to safeguard and maintenance.The 2nd, exchange revolutional slip speed governing transmission scheme.It is a principal mode with low synchronous cascade control or electromagnetic clutch speed governing.As above the controllable silicon electric dynamometer of extra large internal-combustion engine plant adopts the swing structure of wound asynchronous motor; Nantong normal open company adopts Y180L-4 asynchronous machine and YCT250-4B electromagnetic clutch (speed adjustable range 1320-132r/min) for the towing astern device of my company's making-up shop design.Its advantage is a low price, and shortcoming is that speed adjustable range is narrow, and maximum speed is less than 3000r/min, and adjusting speed accuracy is not high, can not respond fast, can only be used for less demanding low-powered engine startup, rub and close occasion.
Summary of the invention
Purpose of the present invention aim to provide a kind ofly have that power draw is big, speed-regulating range width, adjusting speed accuracy height, response speed are fast, the performance of control work condition, automatic measured data automatically, both having can be used as dynamometer machine uses and the measurement effective engine power, the measurement engine mechanical efficiency and the back drawing test system that also can be used as the towing astern testing equipment and measure the engine mechanical wasted power and measure engine mechanical efficiency, to overcome the long-term problem that never solves of prior art, satisfy the growing market and the demand of scientific research and development.
It is well known that, the measurement key of engine mechanical efficiency is how to measure the engine mechanical wasted power, and our formula of known calculations engine mechanical efficiency is: η={ Ne/ (Ne+Nm) } * 100%, wherein: Ne is an effective engine power, and Nm is the engine mechanical wasted power.Effective engine power Ne is exactly the power of our engine that measures with dynamometer machine usually.This is that everybody is familiar with.So the measurement of engine mechanical efficiency is a problem how to measure engine mechanical wasted power Nm after all.And the measurement engine mechanical wasted power that people have grasped has several method, and the present invention has selected motoring breakdown.The main innovation of the present invention partly is that part of engine towing astern device.And the significance of research engine towing astern test is: the one, and reducing friction loss is a worldwide research topic.At present, each state all being devoted to energy-conservation and environmental protection research, reduces friction loss and becomes one of important research work content of internal combustion engine industry.Document shows, the every reduction by 10% of gasoline engine friction loss, and economy can be improved 3-5%, the also corresponding raising of dynamic property.Diesel engine is also so near.The test of engine towing astern is research engine friction loss the best way.The 2nd, the practical work process of engine is quite complicated, and the factor of influence is very many, still has a series of problems to await further research and discussion so far.Practice shows, the course of work of the method research engine of employing towing astern can foreclose oil spout and burning two big complicated factors, thereby gives prominence to the influence of other factors, makes the course of work simplify and be easy to and studies.Its achievement is very helpful to the research of engine practical work process conversely.
Because above-mentioned rational knowledge, the present invention realizes its purpose general technical design, mainly comprises the content of the following aspects: 1. effective engine power measurement mechanism and mechanical loss power measurement mechanism are combined as an integral body; 2. there is the operating mode of catching fire to transfer the switching device shifter of towing astern operating mode to; 3. use motoring breakdown and measurement and control of temperature, simulate the actual machine loss of the engine ignition operating mode under same rotating speed, the synthermal parameter; 4. there is one can realize high-power dragging and the following frequency control kinematic train of operation of supersynchronous rotating speed, thereby reaches the purpose that simulated engine surpasses the above operation of 3000r/min; 5. a chilled water and machine oil auxiliary heater and cooling water temperature and oil temperature monitor are arranged, assurance measures the temperature parameter difference of useful power and mechanical loss power in ± 1 ℃ of scope: 6. have one to guarantee each several part coordination, computer measurement and control device quickly and accurately.
The present invention realizes one of technical scheme that its purpose is taked, and sees also accompanying drawing 1.It comprises computing machine 1, ac variable frequency speed regulation motor 3, variable-frequence governor 4, intelligent shaft coupling 5, torque/speed/power measurement instruments 6, cooling water temperature and oil temperature monitor 7, engine fuel cutter 8, detent/dynamometer 9, braking/measurement of power controller 10, shaft coupling 11 and power-supply controller of electric 12.And said ac variable frequency speed regulation motor 3 is by lead and variable-frequence governor 4 and is electrically connected, and variable-frequence governor 4 is connected with computing machine 1 communication with lead by interface.Said detent/dynamometer 9 is electrically connected by lead and braking/measurement of power controller 10; Braking/measurement of power controller 10 is connected with computing machine 1 communication with lead by interface.Said intelligent shaft coupling 5 is electrically connected by lead and torque/speed/power measurement instruments 6, and torque/speed/power measurement instruments 6 is connected with computing machine 1 communication with lead by interface.Said engine fuel cutter 8 is connected with computing machine 1 communication with lead by interface, said cooling water temperature is connected with computing machine 1 communication with lead by interface with oil temperature monitor 7, said ac variable frequency speed regulation motor 3 is axle between the two by shaft coupling 11 and detent/dynamometer 9 and links, and said detent/dynamometer 9 is axle between the two with intelligent shaft coupling 5 and links, said electrical power control cabinet 12 then by its lead respectively with computing machine 1, ac variable frequency speed regulation motor 3, variable-frequence governor 4, intelligence shaft coupling 5, torque/speed/power measurement instruments 6, cooling water temperature and oil temperature monitor 7, engine fuel cutter 8, detent/dynamometer 9, braking/measurement of power controller 10 is and is electrically connected.
Realize that another technical scheme of its purpose is under general technical design of the present invention: device such as said torque/speed/power measurement instruments 6, cooling water temperature and oil temperature monitor 7, engine fuel cutter 8, braking/measurement of power controller 10 can be integrated, its function is finished by computing machine 1 and corresponding sensor and actuator, sees also accompanying drawing 2.It includes computing machine 1, ac variable frequency speed regulation motor 3, variable-frequence governor 4, intelligence shaft coupling 5, detent 9, shaft coupling 11, institutes such as electrical power control cabinet 12 form, and said ac variable frequency speed regulation motor 3 is electrically connected by lead and variable-frequence governor 4, and variable-frequence governor 4 is connected with computing machine 1 communication with lead by interface, detent 9 is connected with computing machine 1 telecommunication with lead by interface, intelligence shaft coupling 5 is connected with computing machine 1 telecommunication with lead by interface, and 12 of electrical power control cabinets are respectively by lead and computing machine 1, ac variable frequency speed regulation motor 3, variable-frequence governor 4, intelligence shaft coupling 5, detent 9 grades are electrically connected.
Towing astern ac variable frequency speed regulation motor 3 of the present invention is an alternating current generator, and the speed governing transmission is the ac variable frequency speed regulation transmission.According to speed adjustable range, comprehensive technical indexes such as adjusting speed accuracy and response speed, its ac variable frequency speed regulation motor 3 can be selected 50HZ or 60HZ standard normal asynchronous respectively for use, or ac variable frequency speed regulation asynchronous motor, or the interchange spindle drive motor, or autosynchronous motor, or commutatorless machine.
And computing machine 1 also can adopt virtual instrument or single board computer except that adopting PC.The present invention preferably 386 and above computing machine.
And variable-frequence governor 4 adopts general variable-frequence governor.Simultaneously,, also can select the u/f frequency converter of band closed-loop speed control respectively for use, or u/f frequency converter, or the vector-control frequency converter of tape speed sensor with torque control function according to different control accuracies, or the vector-control frequency converter of tape speed sensor not.If select commutatorless machine for use, then should select supporting commutatorless machine variable-frequence governor for use.In order to improve the anti-interference of variable-frequence governor and to reduce the interference that variable-frequence governor itself produces.Visual truth increases inlet wire wave filter or reactor, perhaps output filter and reactor.And variable-frequence governor all will mate brake unit, to increase quick response.
And transmission coupling 11 preferably adopts flexible coupling, secondly is spring coupling or Hooks coupling universal coupling, only transmits moment of torsion with assurance, and does not produce additional bending moment.
And the torque rotary speed sensor of torque/speed/power measurement instruments 6 all adopts non-contacting sensor, so that improve measuring accuracy, improves reliability and life-span.Wherein torque sensor can be selected rotation coupling strain gauge transducer for use, or magnetostriction type or phase difference sensor; Speed probe then can be selected magneto-electric or electro-optical pickoff for use.
And engine fuel cutter 8 is used for Multi-Cylinder Diesel Engine is a circuit of being made up of electronic switch, tractive magnet and power supply, the shutdown handle of tractive magnet pulling engine governor, the break-make of control fuel oil.And what be used for single cylinder engine is a circuit of being made up of electronic switch, solenoid valve and power supply.Be serially connected between the injection pump and high pressure fuel injector pipe of engine the break-make of control fuel oil by solenoid valve.
And brake/dynamometer 9 and braking/measurement of power controller 10, be the braking measurement of power controller of magnetic powder brake or eddy current absorption dynamometer or hydraulic dynamometer and reply thereof.Wherein magnetic powder brake is simple in structure, easy to install and use, and is easy to repair, and the life-span is long, compares with other detent, and also have following characteristics: 1. response speed is fast.Energising promptly produces braking torque moment, and moment of torsion increases also very fast.2. it is good to disconnect performance.When exciting curent disconnected, excess torque was very little.3. torque and exciting curent are linear substantially, and Torque Control is easy.4. decide torque characteristics and be torque in allowed band, only depend on the size of exciting curent, and irrelevant with rotating speed.In order to enlarge the magnetic powder brake range of speeds, can join a speed-changing gear box.
And cooling water temperature and oil temperature monitor 7 are by thermistor or semiconductor temperature-sensitive sensor and digital display meter composition.Why will carry out engine said temperature condition monitoring, be to drag operational situation as much as possible near catching fire operational situation in order to make.Because said temperature is very big to frictional work measurement result influence, temperature when measuring useful power usually and the temperature when measuring mechanical loss power, both differences be controlled at ± 1 ℃ of scope within.
The present invention also is fitted with chilled water and machine oil auxiliary heater 16, and said chilled water and machine oil auxiliary heater 16 are electrically connected by lead and electrical power control cabinet 12, and is connected with computing machine 1 telecommunication with lead by interface.In order under the lower state of environment temperature, using.
The present invention is an electromechanical integrated product.The concrete association of each several part is: tested engine 13, intelligent shaft coupling 5 by the band measurement function is connected with detent/dynamometer 9, set operating mode from computing machine 1, assign instruction to detent/measurement of power controller 10, engine 13 is operated under this operating mode by interface and lead.Originally, computing machine 1 is assigned preheating instruction, and after engine 13 abundant preheatings, enter again under certain setting operating mode and move, after cooling water temperature and oil temperature are all stablized, the test phase of being allowed for access.Sensor in the intelligent shaft coupling 5 of band measurement function, detected torque and tach signal are passed to torque/speed/power measurement instruments 6 through lead, thereby measure the useful power Ne of engine under certain operating mode, meanwhile, write down the temperature parameter relevant under these operating modes by chilled water with oil temperature monitor 7, and send computing machine 1 to by lead and interface with Ne.Computing machine 1 is assigned instruction to engine fuel cutter 8 and variable-frequence governor 4 respectively by interface and lead, and the engine ignition operation is switched to the towing astern operation.The ac variable frequency speed regulation motor 3 that equipped high-speed bearing was handled through special reinforcing and high-speed balancing is connected by 9 of shaft coupling 11 and braking/measurement of power controllers, and then with the band measurement function intelligent shaft coupling 5 be connected with 13 in engine, constitute a towing astern system.Can make ac variable frequency speed regulation motor 3 have power draw more than the 30kW, and can operate under the effect of the general variable-frequence governor 4 of (greater than 4000r/min) under the supersynchronous rotating speed at one, rapid towing astern engine 13, make it also stable operation under the same rotating speed of above-mentioned setting.Under the lower situation of environment temperature, can start chilled water and machine oil auxiliary heater 16, the temperature when keeping chilled water and oil temperature with measurement useful power state is consistent.Equally the intelligent shaft coupling 5 by the band measurement function and torque/speed/power measurement instruments 6 are measured engine mechanical wasted power Nm and the relevant temperature parameter of being noted down by cooling water temperature and oil temperature monitor 7 thereof this rotating speed under, and pass through same path and send computing machine 1 to.Calculate mechanical efficiency η under this operating mode of engine by computing machine 1 according to formula.Afterwards, with result of calculation (test figure) deposit or on display screen, show, or by peripheral hardware 2 print, drawing etc.Total system provides power supply by electrical power control cabinet 12.Present whole switching of the quick Response Table of system and measuring process must guarantee to carry out under the monitoring of cooling water temperature and oil temperature monitor 7, and range of temperature, be controlled at ± 1 ℃ within.
For the test of an operating point, if think that test figure is credible, need not reform, then allow computing machine 1 assign and shut down the instruction that finishes.For reforming or the test of multi-state point, only need repeat above-mentioned circulation.
The course of work of the present invention, with the declared working condition is that example is described as follows: at first enter the artificial preparatory stage, tested engine 13 is carried out axle by its output shaft and intelligent shaft coupling 5 to be linked, and the temperature sensor of cooling water temperature and oil temperature monitor 7 is set in the oil sump place of coolant outlet place and machine oil respectively by lead, engine fuel cutter 8 is connected with the engine fuel shearing device by lead.And allow tested engine 13 preheatings.Enter the computer testing stage then, input calibration operating mode, and the automatic throttle of regulating braking/measurement of power controller 10 and tested engine 13 are stable under the declared working condition engine, by detent/dynamometer 9 absorbed powers.Allow cooling water temperature and oil temperature stable after, record the engine calibration rotating speed, demarcate output torque and useful power Ne by torque/speed/power measurement instruments 6, and write down cooling water temperature and oil temperature this moment; Start fuel-cut device 8 then rapidly, cut off tested engine fuel passage, then tested engine and detent/dynamometer 10 all quit work.Simultaneously rapid power-on, and the variable-frequency motor speed-regulating actuator of being formed by ac variable frequency speed regulation motor 3, variable-frequence governor 4 and shaft coupling 11, the tested engine 13 of towing astern runs under the above-mentioned rated engine speed, and records mechanical loss power Nm by torque/speed/power measurement instruments 6.This process control is in chilled water and oil temperature change ± 1 ℃ scope.More than operation and measurement are finished by the application software of establishment automatically by computing machine 1.Can try to achieve engine mechanical efficiency by calculating is: η={ Ne/ (Ne+Nm) } * 100%.In the above-mentioned formula: Ne is an effective engine power, and Nm is the engine mechanical wasted power.
More than all metrical informations, all gather to computing machine 1, computing machine 1 is noted down, is analyzed by its application software and gathers calculating, breaks into paper spare by computer peripheral equipment 2 (typewriter) again.Certainly, the present invention also can not establish computer peripheral equipment 2, and directly reads measurement data from the fluorescent screen of computing machine 1, and notes with pen and paper, and calculates.
In sum, compared with the prior art the present invention has following characteristics and good effect: (1) power draw big (＞30kW), speed-regulating range width (300-4000r/min), the adjusting speed accuracy height (± 0.5%F.S), response speed is fast.(2) can adopt waterpower or multiple detent such as current vortex or magnetic or dynamometer machine respectively, both can survey useful power, can survey mechanical loss power and mechanical efficiency again.(3) adopt the shaft coupling of being with measurement function, realize the noncontact transmission of bridge circuit power supply and signal.Has the long installation shaft that is easy to of fast high reliability life-span of precision high frequency sound to connecting the shortest advantage such as do not need to return to zero repeatedly of distance.(4) by chilled water and oil temperature observing and controlling, guaranteed the measurement of useful power and mechanical loss power, not only rotating speed is identical, and the ambient temperature parameter of catch fire operating mode and towing astern operating mode is also identical.The mechanical loss power of measuring with motoring breakdown is just very approaching with mechanical loss power actual under the operating mode of catching fire like this.(5) measurement of useful power and mechanical loss power all is shaft coupling and the torque/speed/power measurement instruments that adopts same band measurement function, has eliminated two kinds of surveying instruments of available technology adopting and has measured the error of being brought.(6) total system is coordinated by computing machine unified command, and the robotization that has realized regulating working conditions, data acquisition process, caught fire and switch with towing astern has guaranteed the realization of quick this index of response.(7) ratio of performance to price height of system is easy to make and install.(8) the present invention is owing to its measuring accuracy height, repeatability are fine again, so it is the development of engine industry, exploitation, improves one of important means of product, it is of many uses.Its main application has the following aspects at least: the one, in order to measure the mechanical loss of engine, try to achieve the mechanical efficiency of engine.The 2nd, in order to the Combustion tester coupling, make engine towing astern load-position diagram, pressure build-up rate figure, pressure probability density distribution figure etc., so that carry out thermodynamic analysis.The 3rd, with the method for disassembling, can measure the mechanical loss power of each annex of engine.The 4th, close wear test in order to rubbing of engine.The 5th, in order to engine lubrication oil quality and low friction compound performance test.The 6th, in order to inspect faults such as piston, piston ring and bearing.The 7th, by experiment, use the power that should have in the hope of the engine start motor.The 8th, in order to torque, rotating speed and the power etc. of various power transmission machineries such as prototype gear case.The 9th, towing astern test is not limited to the research of rotating speed when changing, and can be used for internal combustion engine being strengthened and the influence of main performance index such as ratio of compression, eddy current etc., and to the profound researchs such as influence of local Transient Heat Transfer.
Description of drawings
Fig. 1 is the block diagram of a kind of array configuration of the present invention.
Fig. 2 is the block diagram of the another kind of array configuration of the present invention.
Fig. 3 is the block diagram of the third array configuration of the present invention.
Fig. 4 is the block diagram of the 4th kind of array configuration of the present invention.
Fig. 5 is the block diagram of the 5th kind of array configuration of the present invention.
Fig. 6 is the block diagram of the 6th kind of array configuration of the present invention.
Embodiment
One of embodiments of the invention are to see also accompanying drawing 1.With the power≤100kW of tested engine 13, towing astern power≤45kW, rotational speed regulation scope 200～4000r/min, speed stabilizing rate≤0.5%F.S are example.It can select YVP-225S-2 type ac variable frequency speed regulation motor 3 for use, and power draw is 45kW.Select VS-616G5 variable-frequence governor 4 for use by the not tape speed sensor vector control of day intrinsic safety river company production.Select for use Beijing three brilliant modern science and technology group to produce, have and measure torque and rotating speed function, model is JN338-C intelligence shaft coupling 5 (moment of torsion 500Nm, rotating speed 0～5000r/min), and the torque/speed/power measurement instruments 6 supporting with it.Cooling water temperature and oil temperature monitor 7 all adopt XMZ-101A type digital display meter, and sensor is Pt100.Shaft coupling 11 nylon rope flexible coupling is joined CW160 current vortex dynamometer 10 and controller 9 thereof that Luoyang Nan Fengchang produces.And computing machine 1 is selected 386 computing machines for use.Engine fuel cutter 8 adopts DJT24-1030 to shut down electromagnet.And chilled water and machine oil auxiliary heater 16 adopt the ceramic electrical heater element.With above-described various device, instrument and meter, mix electrical power control cabinet 2, and press accompanying drawing 1 combination and connect lead and power lead, promptly form the present invention.If add the computer application software of working out according to measurand and measurement requirement thereof, can drop into and measure and the test running.
Two of the embodiment of the invention is to see also accompanying drawing 2.31N type water brake and the water valve actuator supporting that detent 9 adopts Yi Ke company of Zhejiang University to produce with it.The Pt100 sensor is adopted in the measurement of cooling water temperature and oil temperature.The cut-out of engine fuel adopts DJT24-1030 to shut down electromagnet.The control of engine throttle, the TDTM type throttle actuator that adopts Yi Ke company of Zhejiang University to produce.And the application software of computing machine 1 should comprise contents such as data acquisition, operating mode control and data processing.Other is all as one of embodiment.
The technical indicator system that its technical scheme of the invention process is reached has at least two schemes available, and the one, be used for the A scheme of the following single cylinder engine of 25kW, the 2nd, be used for the B scheme of the following Multi-Cylinder Diesel Engine of 100kW.Its key technical indexes content is as follows respectively:
Technical indicator A option b scheme
Towing astern power 7.5/11kW 45kW
The range of speeds 300～3000r/min 400～4000r/min
Steady speed precision ± 0.5%F.S ± 0.5%F.S
Rate accuracy ± 1r/min ± 1r/min
Torque range 0～100Nm 0～500Nm
Survey square precision ± 0.5%F.S ± 0.5%F.S
0～150 ℃ 0～150 ℃ of temperature-measuring range
Temperature measurement accuracy ± 1 ℃ ± 1 ℃
Torque sensor is selected 200Nm 500Nm for use
The present invention can select relevant various instrument and meters and equipment for use according to above listed technical indicator in the enforcement of its technical scheme, reach its technical indicator to guarantee the present invention.
Realize the technical scheme of the object of the invention, except above two kinds of given best-of-breed technology schemes, it also has 4 kinds at least, please join and read accompanying drawing 3,4,5,6.
Fig. 3 extremely corresponding title of label shown in Figure 6 is: 1 is computer, and 2 is computer peripheral equipment, and 3 is that AC frequency conversion is transferred Speed motor, 4 is variable-frequency governor, and 5 is torque/speed sensor (intelligence coupling), and 6 is that torque/speed/power is surveyed The amount instrument, 7 is cooling water temperature and oil temperature monitor, and 8 is the engine fuel cutter, and 9 are braking/dynamometer, 10 for braking/measurement of power controller, and 11 is shaft coupling, and 12 is electrical power control cabinet, and 13 is tested engine, 14 be torsion, Rotating speed, power are surveyed instrument, and 15 is the ac variable frequency speed regulation motor of pendulum type balance structure, and 16 is that cooling water and machine oil are auxiliary adds Hot device.
Claims (10)
1, a kind of measurement of engine mechanical efficiency and back drawing test system is characterized in that: include computing machine (1), ac variable frequency speed regulation motor (3), variable-frequence governor (4), intelligent shaft coupling (5), torque/speed/power measurement instruments (6), cooling water temperature and oil temperature monitor (7), engine fuel cutter (8), detent/dynamometer (9), braking/measurement of power controller (10), shaft coupling (11) and electrical power control cabinet (12); Said ac variable frequency speed regulation motor (3) is electrically connected by lead and variable-frequence governor (4), and variable-frequence governor (4) is connected with computing machine (1) communication by interface and lead; Said detent/dynamometer (9) is electrically connected by lead and braking/measurement of power controller (10), and brake/measurement of power controller (10) is connected with computing machine (1) communication with lead by interface; Said intelligent shaft coupling (5) is electrically connected by lead and torque/speed/power measurement instruments (6), and torque/speed/power measurement instruments (6) is connected with computing machine (1) communication with lead by interface; Said engine fuel cutter (8) is connected with computing machine (1) communication with lead by interface; Said cooling water temperature is connected with computing machine (1) communication with lead by interface with oil temperature monitor (7); Said ac variable frequency speed regulation motor (3) is axle between the two by shaft coupling (11) and detent/dynamometer (9) and links, and said detent/dynamometer (9) is the axle binding between the two with intelligent shaft coupling (5); Said electrical power control cabinet (12) then is with computing machine (1), ac variable frequency speed regulation motor (3), variable-frequence governor (4), intelligent shaft coupling (5), torque/speed/power measurement instruments (6), cooling water temperature and oil temperature monitor (7), engine fuel cutter (8), detent/dynamometer (9), braking/measurement of power controller (10) respectively by lead and is electrically connected.
2, measurement of engine mechanical efficiency according to claim 1 and back drawing test system, it is characterized in that: torque/speed/power measurement instruments (6), cooling water temperature and oil temperature monitor (7), engine fuel cutter (8) and braking/measurement of power controller (10) constitute integrated device, its function is finished by computing machine (1) and corresponding sensor and actuator, and the application software of computing machine (1) comprises the content of data acquisition, operating mode control and data processing; Detent/dynamometer (9) is a detent.
3, measurement of engine mechanical efficiency as claimed in claim 1 or 2 and back drawing test system is characterized in that: said ac variable frequency speed regulation motor (1) is common asynchronous moter or ac variable frequency speed regulation asynchronous machine or Alternating Current Shaft-driven Motor or ac synchronous motor or commutatorless machine.
4, measurement of engine mechanical efficiency as claimed in claim 1 or 2 and back drawing test system is characterized in that: said variable-frequence governor (4) is general variable-frequence governor or does not have the reversing motor variable-frequence governor.
5, measurement of engine mechanical efficiency as claimed in claim 1 or 2 and back drawing test system is characterized in that: said shaft coupling (11) is flexible coupling or spring coupling or Hooks coupling universal coupling.
6, measurement of engine mechanical efficiency as claimed in claim 1 or 2 and back drawing test system, it is characterized in that: it also has chilled water and machine oil auxiliary heater (16), and said chilled water and machine oil auxiliary heater (16) are electrically connected by lead and electrical power control cabinet (12), and are connected with computing machine (1) telecommunication with lead by interface.
7, measurement of engine mechanical efficiency as claimed in claim 1 and back drawing test system, it is characterized in that: said detent/dynamometer (9) is magnetic braking/dynamometer or current vortex braking/dynamometer or hydraulic brake/dynamometer, and said braking/measurement of power controller (10) is the braking/measurement of power controller for tackling mutually with magnetic braking/dynamometer, current vortex braking/dynamometer, hydraulic brake/dynamometer respectively then.
8, measurement of engine mechanical efficiency as claimed in claim 1 and back drawing test system, it is characterized in that, the torque/speed sensor of said torque/speed/power measurement instruments (6) all is a non-contacting sensor, and its torque sensor is rotation coupling strain gauge transducer or magnetostriction type sensor or phase difference sensor, and its speed probe is magnetoelectric sensor or electro-optical pickoff.
9, measurement of engine mechanical efficiency as claimed in claim 1 and back drawing test system, it is characterized in that: said engine fuel cutter (8) is by tractive magnet, and formed by electromagnet pulling engine governor shutdown handle, or the solenoid valve that is connected between injection pump of engine and the high pressure fuel injector pipe is formed.
10, measurement of engine mechanical efficiency as claimed in claim 1 and back drawing test system is characterized in that: said cooling water temperature and oil temperature monitor (7) are the thermistor-type temperature monitors, or the sensor-type temperature monitor of semiconductor temperature-sensitive.
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| CN00133212A CN1119640C (en) | 2000-11-09 | 2000-11-09 | Measurement of engine mechanical efficiency and back drawing test system |
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| CN00133212A CN1119640C (en) | 2000-11-09 | 2000-11-09 | Measurement of engine mechanical efficiency and back drawing test system |
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-
2000
- 2000-11-09 CN CN00133212A patent/CN1119640C/en not_active Expired - Lifetime
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