CN208595993U - The on-line measuring device of the real-time torque of engine under a kind of whole vehicle state - Google Patents
The on-line measuring device of the real-time torque of engine under a kind of whole vehicle state Download PDFInfo
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- CN208595993U CN208595993U CN201821328235.3U CN201821328235U CN208595993U CN 208595993 U CN208595993 U CN 208595993U CN 201821328235 U CN201821328235 U CN 201821328235U CN 208595993 U CN208595993 U CN 208595993U
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Abstract
The utility model provides a kind of on-line measuring device of the real-time torque of engine under whole vehicle state, it respectively obtains circulation amount of work according to the product integral of dynamic pressure in cylinder and volume of cylinder change rate, pumping loss function, engine high pressure circulation mean indicated pressure (MIP IMEP is obtained divided by discharge capacity, engine low pressure recycle is averaged pumping loss pressure PMEP, the net mean indicated pressure (MIP NMEP=IMEP-PMEP of engine, based on actual measurement engine speed and admission pressure, interpolation obtains mechanical loss pressure FMEP on the stable state test stand performance map Map of engine, the FMEP obtained according to calculated IMEP and PMEP combination interpolation, calculate the BMEP of engine, and the discharge capacity account of combination engine goes out the torque of engine.The utility model is able to solve the problem that torque of the engine under transient condition up to now is difficult to accurate on-line checking.
Description
Technical field
The utility model relates to the real-time torques of engine under IC Engine Test Technology field more particularly to a kind of whole vehicle state
On-line measuring device.
Background technique
With the rapid development of the automotive industry, car ownership is also increased considerably, and environment dirt consequently also occurs
The great problem such as dye and energy shortages.Energy-saving and emission-reduction have become global common recognition and development trend, improve car engine
Machine in-cylinder combustion efficiency and heat to power output efficiency, control pollutant generate, and are that automotive energy-saving emission-reducing is most direct, most effective technology
Scheme.And engine is to realize energy-saving and emission-reduction to the accurate real-time inspection and control technology of real-time torque under actual motion state
It is crucial.
The performance development of engine and optimization, the calibration of operating parameter, are usually completed in the steady state；And vehicle engine
The actual operating mode of machine is largely transient condition.Therefore the performance under transient condition determines the practical power of engine
Property, economy and emission level；If detecting the real-time output torque of engine under whole vehicle state, the present domestic or even world
On, enterprise, colleges and universities and scientific research institution are generally issued by installing torque sensor detection vehicle operating status additional on output shaft
The torque of motivation.But torque sensor is on the one hand expensive, and to be on the other hand mounted on the vehicle of an actual motion also has
Certain difficulty, poor universality (all needing to re-scale for each engine output shaft) and often due to engine is defeated
Arrangement space between shaft and speed changer is impermissible for and can not survey；So kind detection method has certain limitation.Together
When, there are other methods also to measure the torque of engine under vehicle operating status, but it is all less than satisfactory in precision aspect.
Due to lacking detection method and technology, actual performance performance of the engine on vehicle is often unknowable；With stable state Bench calibration
As a result difference and inducement, often can hardly be explained；Superiority and inferiority degree of the rack stable state calibrating parameters under transient state, is often flutterred
It is north blurred；So, engine has important practical valence to the accurate real-time inspection and control technology of its torque under whole vehicle state
Value.
Utility model content
To solve the above-mentioned problems, the utility model proposes a kind of on-line checkings of the real-time torque of engine under whole vehicle state
Device, being able to solve the prior art cannot be accurately under the variable working condition of on-line checking engine the technical issues of real-time torque.
The purpose of this utility model is achieved through the following technical solutions:
The utility model provides a kind of on-line measuring device of the real-time torque of engine under whole vehicle state comprising:
Dynamic pressure transducer, speed probe, charge amplifier, transient state number in air inlet side dynamic pressure transducer, cylinder
According to acquisition equipment and computer；
The air inlet side dynamic pressure transducer is mounted on inlet manifold and cylinder head interface by manifold side, for measuring
The air inlet lateral pressure of engine, and export corresponding transducing signal；
Dynamic pressure transducer installation at spark plug, is used to dynamic pressure in real-time measurement cylinder, and export in the cylinder
Corresponding transducing signal；
The transducing signal that dynamic pressure transducer exports in the air inlet side dynamic pressure transducer and cylinder is put by charge
Big device is converted to voltage signal, and is input to transient data collection equipment by shielding line and is acquired；
Tach signal is transferred in the transient data collection equipment by the speed probe of the engine；
The computer is connect with the transient data collection equipment by data line, and engine speed, engine are utilized
Air inlet lateral pressure, dynamic pressure in cylinder, engine discharge capacity account obtain the torque of engine.
It is highly preferred that the transient data collection equipment is Combustion tester.
The utility model has the beneficial effects that:
1) the utility model is directed to the characteristics of engine working process, using advanced sensors technology, engine operation mistake
The technology of numerical simulation of journey provides a kind of practicable solution for the on-line checking of torque under engine transient operation, and
For analyzing, understanding the calibration result of torque in transient process；
2) the utility model uses a dynamic pressure transducer, reduces the range of simulation calculating, as a result more accurate,
Arithmetic speed is faster；
3) the utility model, which is not necessarily to the installation torque sensor on output shaft, exist to the transient torque of engine
Line detection, can be used for vehicle measurement, and application range is more extensive；
5) the utility model by the measured result with engine pedestal and uses strain chip torquemeter real on vehicle
The result of survey compares, and preferably demonstrates the precision of the utility model, also for the operating parameter of the working cycles of engine with
And the adjustment of control parameter provides data support.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the on-line measuring device of the utility model；
Fig. 2 is the working principle of the utility model；
Fig. 3-1 is the change curve schematic diagram of certain engine speed under transient condition in the utility model；
Fig. 3-2 is the comparison signal of the IMEP cycle balance of each cylinder of certain engine under transient condition in the utility model
Figure；
Fig. 3-3 is certain 1 cylinder IMEP circulation change rate display diagram of engine under transient condition in the utility model；
Fig. 3-4 is certain 2 cylinder IMEP circulation change rate display diagram of engine under transient condition in the utility model；
Fig. 3-5 is certain 3 cylinder IMEP circulation change rate display diagram of engine under transient condition in the utility model；
Fig. 3-6 is certain 4 cylinder IMEP circulation change rate display diagram of engine under transient condition in the utility model；
Fig. 3-7 is pair of certain engine excess air coefficient Lambda cylinder uniformity under transient condition in the utility model
Compare schematic diagram；
The change rate exhibition that Fig. 3-8 is 1 cylinder excess air coefficient Lambda of certain engine under transient condition in the utility model
Diagram；
The change rate exhibition that Fig. 3-9 is 2 cylinder excess air coefficient Lambda of certain engine under transient condition in the utility model
Diagram；
The change rate exhibition that Fig. 3-10 is 3 cylinder excess air coefficient Lambda of certain engine under transient condition in the utility model
Diagram；
The change rate exhibition that Fig. 3-11 is 4 cylinder excess air coefficient Lambda of certain engine under transient condition in the utility model
Diagram；
Fig. 4 be in the utility model on rack permanent revolving speed, full load load (Load-Step) test (2000 rpms,
0.2 second) torque arithmetic value and measured value contrast schematic diagram；
Fig. 5 is the working principle diagram of complete vehicle test power performance detector in the utility model；
Fig. 6 is certain riding road wheel end torque measured result under road condition in the utility model and is based on on-line measuring device
Calculated result contrast schematic diagram.
Specific embodiment
To keep the structure of the utility model relatively sharp, the utility model is described in more detail with reference to the accompanying drawing.
The utility model provides a kind of on-line measuring device of the real-time torque of engine under whole vehicle state, structure such as Fig. 1
It is shown, including following components:
Air inlet side dynamic pressure transducer 1, cylinder dynamic pressure transducer 2, speed probe 3, charge amplifier 4, wink
State data acquisition equipment 5 and computer 6；
Air inlet side dynamic pressure transducer 1 and cylinder dynamic pressure transducer 2 are dynamic pressure transducer.By this two
A dynamic pressure transducer, can be read directly out pressure value.
Wherein air inlet side dynamic pressure transducer 1 is mounted on inlet manifold and cylinder head interface by manifold side, can be away from
From 10~20mm of the manifold side, for measuring the air inlet lateral pressure of engine.
The installation of cylinder dynamic pressure transducer 2 therein at spark plug, uses spark plug type dynamic pressure transducer,
For dynamic pressure in real-time measurement cylinder.
The charge signal that air inlet side dynamic pressure transducer 1 and cylinder dynamic pressure transducer 2 export is put by charge
Big device 4 is converted to voltage signal, and is input to transient data collection equipment 5 by shielding line and is acquired.
The tach signal can be shared with the original speed probe 3 of engine, one group in parallel on rotational speed output signal line
Tach signal is input in transient data collection equipment 5 by shielded wire harness.
One group of shielded wire harness in parallel, defeated by tach signal on the rotational speed output signal line of the speed probe 3 of engine
Enter into transient data detection device 5, transient data collection equipment 5 is specially to use Combustion tester in this embodiment, will
The tach signal that one turn of engine rotation is divided into 360 crank angle degrees, that is, generates 360 corner signals, wherein including 1
A trigger signal.Corner signal is usually pulse signal, corresponding 360 pulses of 360 corner signals, trigger signal
Corresponding pulse amplitude is higher than other pulses.
Above-mentioned computer 6 is connect with transient data collection equipment 5 by data line, is received transient data collection equipment 5 and is adopted
Collect corresponding readings, gets engine speed, the air inlet lateral pressure of engine, dynamic pressure in cylinder；And utilize these readings
Value calculates engine high pressure circulation mean indicated pressure (MIP (being indicated with IMEP) and engine low pressure recycle is averaged pumping loss pressure
Power (is indicated) with PMEP, and the air inlet lateral pressure according to the revolving speed of engine and engine carrys out interpolation and obtains mechanical loss pressure
(being indicated with FMEP) calculates the mean effective pressure (being indicated with BMEP) of engine, sets out in conjunction with the discharge capacity account of engine
The torque of motivation.
Circulation amount of work, pumping loss are respectively obtained according to the product integral of dynamic pressure in cylinder and volume of cylinder change rate
Function obtains IMEP, PMEP, NMEP=IMEP-PMEP divided by discharge capacity.
1, the instantaneous volumetric of cylinder is calculated using following formula:
Wherein, V is the instantaneous volumetric of cylinder；D is cylinder bore；S is piston stroke；ε is cylinder compression ratio；λ is crank
Connecting rod ratio；For crank angle.
2, the mean indicated pressure (MIP in cycle of higher pressure is calculated
According to the height of pressure in the course of work, a complete job of a four-stroke engine can be recycled and be divided into
Cycle of higher pressure and low pressure recycle.Wherein low pressure recycle is made of breathing process and exhaust process, cycle of higher pressure by compression process and
Combustion expansion process composition.Mean indicated pressure (MIP in cycle of higher pressure is calculated using following formula:
Wherein, IMEPHPMean indicated pressure (MIP is recycled for engine high pressure, and subscript " HP " representative " high pressure ", when writing is usual
Subscript is omitted, i.e. cycle of higher pressure mean indicated pressure (MIP is represented by IMEP；For in cylinder in dynamic pressure valueWhen position
Corresponding instantaneous pressure；DV is the differential of displacement；VhFor effective swept volume of cylinder；In default igniting herein only
Point is crank angle zero point.
3, the average pumping loss pressure of low pressure recycle process is calculated using following formula:
Wherein, PMEP is the average pumping loss pressure of engine,It is in crank angle for dynamic pressure in cylinder
Corresponding instantaneous pressure when position；DV is the differential of displacement；VhFor effective swept volume of cylinder.
4, in a complete working cycles, the net mean indicated pressure (MIP of engine is calculated using following formula:
NMEP=IMEP-PMEP formula (4)
Wherein, the net mean indicated pressure (MIP of NMEP engine；IMEP is that engine high pressure recycles mean indicated pressure (MIP；PMEP
It is averaged pumping loss pressure for engine low pressure recycle.
Based on actual measurement engine speed and admission pressure, interpolation is obtained on the stable state test stand performance actual measurement Map of engine
Mechanical loss pressure is indicated with FMEP.
Mechanical loss pressure FMEP can be measured by stable state bench test, but the mechanical loss pressure that steady state test measures
Pumping loss pressure is frequently included.Therefore for transient state mechanical loss pressure, the engine transient revolving speed based on actual measurement with
And admission pressure, interpolation acquires in the stable state bench test engine performance MAP obtained of engine.If stable state is started
Machine performance MAP, then can be regular by general character from the complete universal characteristic performance data for having obtained similar h type engine h
Come.
According to the FMEP that calculated IMEP and PMEP combination interpolation obtains, the mean effective pressure of engine is calculated
BMEP, and the discharge capacity account of combination engine goes out the transient torque of engine.Specific calculating process is as follows:
1, the mean effective pressure BMEP of engine is calculated:
BMEP=IMEP-PMEP-FMEP formula (5)
2, the transient torque of engine is calculated:
After calculating engine volume mean effective pressure, in conjunction with the transient torque of the discharge capacity account engine of engine,
Specific formula is as follows:
Wherein, TtqFor the transient torque of engine, τ be number of stroke (to quartastroke engine: τ=4, to two-stroke internal combustion
Machine: τ=2)；BMEP is the mean effective pressure of engine.
Result and evaluation are then directly exported after current working.
The real-time torsion under whole vehicle state is mounted in a kind of above-mentioned engine provided by the utility model below by experiment
The accuracy of the feasibility of square on-line measuring device and the testing result obtained by this method is verified, specific as follows:
Since the cylinder that this method only has chosen a cylinder is pressed into the acquisition of row data, so needing to consider more under transient condition
Otherness between the cylinder and cylinder of cylinder machine.The imbalance of aerodynamics process, fresh charge amount and residual in each cylinder
The IMEP and NMEP that difference and actual compression ratio, the otherness of combustion process of gas flow cause each cylinder to generate may
Difference, this is the main source of the trueness error of this method.So problem be this species diversity have much and which cylinder or which
A little cylinders are the most typically cylinders that can represent entire engine.
By taking four-cylinder gasoline machine as an example, each cylinder is mounted on dynamic pressure transducer, while measuring all four
Transient state cylinder pressure in cylinder.Shown in Fig. 3-1, it is the variation of engine speed, illustrates shown in Fig. 3-2 and inhaled naturally under transient condition
The high tension loop IMEP that each cylinder generates in four cylinders of gas engine.Transient condition is compared in Fig. 3-3 to Fig. 3-6
The IMEP cyclical variations rate of each cylinder in lower naturally aspirated engine.The excess of each cylinder in four cylinders shown in Fig. 3-7
Air coefficient (is indicated) with Lambda.The Lambda cyclical variations rate that each cylinder is compared in Fig. 3-8 to Fig. 3-11, by scheming
3-1 to Fig. 3-11 is it is found that the difference of each cylinder IMEP mostlys come from the subtle difference for recycling air inflow and distributive value between cylinder and cylinder
Not (denseer cylinder IMEP is larger)；In addition, cyclical variations rate is also to lead to each non-uniform inducement of cylinder performance of Multi-Cylinder Diesel Engine.Thus may be used
Know, in addition to idling operation (load be 0 or close to 0 when), the difference of each cylinder IMEP and average value is not more than 5%；Each cylinder
The mode of the difference of IMEP and average value is fixed: i.e. subaverage person's always subaverage, vice versa.It therefore, can be with
The acquisition of row data is pressed by the cylinder to a cylinder to characterize the performance of entire engine, a kind of above-mentioned engine is mounted in vehicle
The on-line measuring device of real-time torque under state is feasible.
In order to verify the accuracy of testing result, carry out rack transient state (Load step) test and vehicle road respectively
Cyclic test, by the utility model proposes a kind of above-mentioned engine be mounted in the real-time torque under whole vehicle state it is online indirectly
Detection method and device are applied to the transient test of engine, the continuous transient torque for detecting engine, by the detection knot of acquirement
Fruit compares.Specific experimentation is as follows in detail:
1, rack transient state (Load step) is tested
Since engine pedestal mapping may be considered rack steady state condition to the transition between vehicle transient condition,
Therefore quasi- to carry out permanent revolving speed full load load transient test research under typical revolving speed (such as 2000 rpms).By self-developing
Engine transient detection technique be applied to the test, test method are as follows: first by engine stabilizer at various speeds certain
One small load condition；Then standard-sized sheet, dynamometer machine are run air throttle by equal rotating speed control modes in the given time；Whole note later
Record the parameters such as engine charge pressure, torque and revolving speed.The transient state cylinder pressure and boost pressure signal of pressure sensor acquisition pass through
Transient detection analyzer is inputted after charge amplifier conversion, tach signal inputs Transient detection analyzer by designated lane.Transient state
After detection analysis instrument obtains engine rotational speed signal, tach signal is converted into footmark signal (corner signal), then base
The transient signals such as cylinder pressure, admission pressure are recorded in corner signal.Then, transient state cylinder pressure and boost pressure signal couple in real time
Into Transient detection analyzer, it is hereby achieved that the performance parameters such as IMEP, PMEP, then obtain the transient torque of engine.
Fig. 4 show on engine pedestal permanent revolving speed, full load load (Load-Step) test torque calculated value and actual measurement
Value comparison.As we can see from the figure: the motor instant torque being calculated based on cylinder pressure, the measured result with engine pedestal
It coincide good, shows that the indirect detection technique of engine torque based on actual measurement cylinder pressure of exploitation has quite high precision confidence level.
2, vehicle road test cycle
It is verified by precision of the vehicle road test cycle to this method.Torquemeter is installed in vehicle drive shaft
(being combined by foil gauge, signal output apparatus and signal receiver, as shown in Figure 5), the transient state that record vehicle exports when running is turned round
Square.It is as follows to strain chip torquemeter equipment mounting means:
Crankshaft semiaxis is removed, foil gauge and signal output apparatus are installed in its surface suitable position；
Torque measuring device is demarcated；
Jack shaft is reinstalled on vehicle；
Wireless signal receiver is mounted on the closer side wing of inner jack shaft；
Wireless signal receiver is connect with signal conversion module, and is transferred data on computer and be monitored and acquire.
Road wheel end torque under the transient condition of actual measurement is compared with the result being calculated based on transient state cylinder pressure, is such as schemed
Shown in 6.It can be seen that being identical based on the result that transient state cylinder pressure is calculated with torquemeter measured value.To test well
The precision of the testing result obtained by this method is demonstrate,proved.
Although the utility model has been described by way of example and in terms of the preferred embodiments, above embodiments are the utility model one
Point, the present invention is not limited to the above embodiments, and any person skilled in the art is not making creative work
Under the premise of, based on technical solutions of the utility model to any simple modification, equivalent change and modification made by above-described embodiment, all
It falls into the protection scope of the utility model.What the protection scope of the utility model should be defined with claims hereof
Content is standard.
Claims (2)
1. the on-line measuring device of the real-time torque of engine under a kind of whole vehicle state, which is characterized in that the on-line measuring device
Include:
Dynamic pressure transducer (2), speed probe (3), charge amplifier in air inlet side dynamic pressure transducer (1), cylinder
(4), transient data collection equipment (5) and computer (6)；
The air inlet side dynamic pressure transducer (1) is mounted on inlet manifold and cylinder head interface by manifold side；
Dynamic pressure transducer (2) is installed at spark plug in the cylinder；
The signal output end of dynamic pressure transducer (2) is separately connected electricity in the air inlet side dynamic pressure transducer (1) and cylinder
Lotus amplifier (4), charge amplifier (4) are connect by shielding line with transient data collection equipment (5)；
The speed probe (3) is against engine output end, and signal output end and the transient data collection equipment (5) are even
It connects；
The computer (6) is connect with the transient data collection equipment (5) by data line, and the computer utilizes the wink
The discharge capacity of dynamic pressure, engine in the air inlet lateral pressure of engine speed, engine in state data acquisition equipment (5), cylinder,
The torque of engine is calculated.
2. the on-line measuring device of the real-time torque of engine, feature exist under a kind of whole vehicle state according to claim 1
In the transient data collection equipment (5) is Combustion tester.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821328235.3U CN208595993U (en) | 2018-08-17 | 2018-08-17 | The on-line measuring device of the real-time torque of engine under a kind of whole vehicle state |
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| CN201821328235.3U CN208595993U (en) | 2018-08-17 | 2018-08-17 | The on-line measuring device of the real-time torque of engine under a kind of whole vehicle state |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110080892A (en) * | 2019-05-21 | 2019-08-02 | 车行天下网络科技股份有限公司 | Automobile control method based on boost pressure signal |
| CN111006867A (en) * | 2019-11-26 | 2020-04-14 | 广西玉柴机器股份有限公司 | Calibration method of engine air intake correction map table and air intake correction method |
-
2018
- 2018-08-17 CN CN201821328235.3U patent/CN208595993U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110080892A (en) * | 2019-05-21 | 2019-08-02 | 车行天下网络科技股份有限公司 | Automobile control method based on boost pressure signal |
| CN111006867A (en) * | 2019-11-26 | 2020-04-14 | 广西玉柴机器股份有限公司 | Calibration method of engine air intake correction map table and air intake correction method |
| CN111006867B (en) * | 2019-11-26 | 2021-08-20 | 广西玉柴机器股份有限公司 | Calibration method of engine air intake correction map table and air intake correction method |
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