CN100443864C - Vehicle air throttle air inflow test system and testing method - Google Patents
Vehicle air throttle air inflow test system and testing method Download PDFInfo
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- CN100443864C CN100443864C CNB2005100217090A CN200510021709A CN100443864C CN 100443864 C CN100443864 C CN 100443864C CN B2005100217090 A CNB2005100217090 A CN B2005100217090A CN 200510021709 A CN200510021709 A CN 200510021709A CN 100443864 C CN100443864 C CN 100443864C
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Abstract
The invention discloses an air input testing system and testing method of the motor car air throttle which includes the vacuum source, the pressure sensor, the thermal gas flowmeter and the control unit. The vacuum source includes the air guiding hollow connected with the air vent of the throttle which provides the vacuum condition for the air vent; the control unit can keep the vacuum degree in a stable error range and collect the flow rate signal outputted by the thermal gas flowmeter and compute the air flow according to the airflow sectional area. The invention can measure the air flow directly and has the simple structure and low cost.
Description
[technical field]
The present invention relates to the engine bench test system and the method for testing of throttle body air inflow under different operating modes in the automotive air intake system, particularly the test macro and the method for testing of the air throttle air inflow under the different opening situation of by-pass during the simulated automotive idling.
[background technology]
Present most of throttle body manufacturer to air throttle air inflow carry out engine bench test the time mainly adopt the method for sonic nozzle measurement gas flow.Though this method has the precision height, advantages such as good reproducibility, but complex structure, and when measuring the air leakage (about 0.5g/s) of idling passage full cut-off, need use the nozzle of critical condition down-off less than 0.1g/s, because this nozzle technological requirement height costs an arm and a leg, the domestic producer that production is seldom arranged.So the non-throttle body manufacturer for general vehicle complete vehicle manufacturing plant or other need detect air throttle air inflow makes not only uneconomical but also inconvenient in this way.
[summary of the invention]
Fundamental purpose of the present invention is exactly in order to solve prior art problems, and a kind of vehicle air throttle air inflow test system and method for testing are provided, and test component can obtain easily, and integrated cost is lower.
For achieving the above object, a kind of vehicle air throttle air inflow test system that the present invention proposes comprises:
Vacuum source comprises being used for the gas flow guiding chamber that is connected with the gas outlet of throttle body that described vacuum source provides vacuum environment for the gas outlet of throttle body;
Pressure transducer is arranged in the gas flow guiding chamber, is used for the vacuum tightness in the measurement gas diversion cavity;
Thermal gas flowmeter is arranged in the gas flow guiding chamber, is used for the flow velocity under the status of criterion of test gas water conservancy diversion intracavity gas;
Control module, the vacuum tightness signal of response pressure sensor output, bleed according to this vacuum tightness and setting vacuum degree control vacuum source, and gather the flow velocity signal of thermal gas flowmeter output when being used within the vacustat in the gas flow guiding chamber is being set the vacuum tightness error range, and according to the long-pending gas mass flow that converts to of the flow area in the gas flow guiding chamber.
Further improvement of the present invention is: also comprise and can amplify modulate circuit with Filtering Processing to simulating signal, described modulate circuit provides vacuum source, pressure transducer and the thermal gas flowmeter path to control module.
Also comprise the modulus/D/A converting circuit that is connected between modulate circuit and the control circuit.
Described gas flow guiding chamber comprises straight tube-like barretter and the vacuum tank that is connected.
Of the present invention further the improvement is: described gas flow guiding chamber also comprises at least one surge tank that is connected between barretter and the vacuum tank.
Described vacuum source also comprises vacuum pump, variable-frequency motor and frequency converter, the signal of described frequency converter response control unit, and the control of conversion motor rotates, and described variable-frequency motor drives vacuum pump and rotates, and described vacuum pump is used for vacuum tank is bled.
Described control module also is used for linking to each other with the by-pass stepper motor of control throttle body by-pass aperture.
For achieving the above object, a kind of vehicle air throttle air inflow method of testing that the present invention proposes may further comprise the steps:
A1, control module control vacuum source are bled;
Vacuum tightness signal in B1, control module response pressure sensor senses and the gas flow guiding chamber that the throttle body gas outlet is connected, and with set vacuum tightness relatively, execution in step C1 in the time of within the vacustat in the gas flow guiding chamber is being set the vacuum tightness error range;
C1, the flow velocity signal under the gas standard situation in the gas flow guiding chamber of control module collection thermal gas flowmeter output;
D1, control module amass according to the flow area in the gas flow guiding chamber, convert the flow velocity signal under the gas standard situation to gas mass flow.
Control module may further comprise the steps the control of vacuum source in the described steps A 1:
Vacuum tightness signal in the gas flow guiding chamber of A11, the output of control module response pressure sensor compares practical vacuum degree in the gas flow guiding chamber and setting vacuum tightness, reaches the following execution in step A12 in limited time that sets the vacuum tightness error range when the practical vacuum degree;
A12, with the practical vacuum degree in the gas flow guiding chamber with set the controlling value that vacuum tightness calculates according to pid algorithm;
A13, with the rotating speed of this controlling value in conjunction with the variable-frequency motor of the concrete parameter control vacuum source of vacuum source;
The rate of air sucked in required of A14, variable-frequency motor control vacuum pump.
Further improvement of the present invention is further comprising the steps of: control module control by-pass stepper motor rotates, and corresponding by-pass aperture is set, and execution in step A1 is to D1 then.
Utilize vacuum source to make under the work condition environment of throttle body for simulation, utilize thermal gas flowmeter to measure flow velocity signal under the gas standard situation in the gas flow guiding chamber, the sectional area of crossing according to the gas stream under the actual conditions is converted into gaseous mass or volume flow value to this signal again.This programme is compared with the method for the sonic nozzle measurement gas flow of available technology adopting has following beneficial effect: 1) device that uses in this programme all is general device, the convenient purchase.2) direct measurement gas mass rate, test structure is simple, and error source is less, convenient calibration.3) integrated cost is low.For general automobile factory, vacuum source (vacuum pump, vacuum tank etc.) all be the testing apparatus of using always, except measuring air throttle air inflow, these automobile components of similar intake air temperature pressure transducer detect and all need to use vacuum source, therefore vacuum source can overlap by several complete equipments shared in producer with good conditionsi, shares a part of cost.The present invention need use a high-precision thermal flowmeter, though the price of this flowmeter is also relatively more expensive at present, generally,, all more have superiority in this way still compared with the use and the maintenance cost of a plurality of sonic nozzles and the convenience of considering installation all more than 10,000 yuan.And for general automobile factory, if the mass rate of gases such as testing automobile tail gas, thermal flowmeter all is very important, so thermal flowmeter also can share one with other test steps, splits the cost.4) by control module control, the test automation degree is higher, easy operating, the gas mass flow of the throttle body under the aperture of the different by-passes of automatically testing.
Feature of the present invention and advantage will be elaborated in conjunction with the accompanying drawings by embodiment.
[description of drawings]
Fig. 1 is the structural representation of a kind of embodiment of the present invention;
Fig. 2 is the process flow diagram of a kind of embodiment of the present invention.
[embodiment]
Specific embodiment one, as shown in Figure 1, this test macro comprises vacuum source, pressure transducer, thermal gas flowmeter, also comprise modulate circuit, modulus/D/A converting circuit and control module that order links to each other, vacuum source comprises gas flow guiding chamber, vacuum pump, variable-frequency motor and frequency converter.The gas flow guiding chamber is connected with the gas outlet of throttle body, and frequency converter is electrically connected with modulate circuit, the control signal of response control unit, and the Frequency Converter Control variable-frequency motor rotates, and variable-frequency motor drives vacuum pump and rotates, and vacuum pump is to the gas flow guiding chamber pumping.The effect of modulate circuit be with the simulating signal of passing through amplify, filtering.Pressure transducer and thermal gas flowmeter also are electrically connected with modulate circuit respectively.Pressure transducer is arranged in the gas flow guiding chamber, is used for the vacuum tightness in the measurement gas diversion cavity.Thermal gas flowmeter also is arranged in the gas flow guiding chamber, is used for the flow velocity under the status of criterion of test gas water conservancy diversion intracavity gas.
The gas flow guiding chamber may further include barretter and vacuum tank, and vacuum tank is connected with the gas outlet of throttle body by barretter, and vacuum pump is bled to vacuum tank, for the gas outlet of throttle body provides vacuum environment, simulated condition.The barretter of the preferred straight tube-like of barretter, to stablize the air-flow that flow out the air throttle gas outlet, pressure transducer and thermal gas flowmeter all are placed in the barretter.
The principle of work of present embodiment is: thermal gas flowmeter is a kind of sensor of surveying gas mass flow, its advantage is can to weigh with an identical standard for the gas flow of different external environments or condition (as different pressures temperature etc.), because it has exported the flow velocity signal that the gas flow that records all directly is scaled under the status of criterion, present embodiment only need be according to the actual conditions (sectional area that gas stream is crossed, be that flow area is long-pending) this flow velocity signal is converted into gaseous mass or volume flow value, do not need us to do the compensation conversion work of aspects such as temperature, pressure again.Need the actual condition on the simulated automotive when measuring air throttle air inflow, the pressure reduction on air inlet/outlet both sides was about 60kpa when throttle body was worked usually, so also need to meet this requirement when on stand, measuring air throttle air inflow, if therefore throttle body air intake opening the pressure here is an atmospheric pressure, will there be the vacuum tightness about 60kpa the gas outlet here.Usually can connect one section barretter here for steady air flow air throttle gas outlet, again barretter is received on the vacuum tank, therefore the effect of vacuum pump is exactly that the vacuum tightness in the vacuum tank is extracted into about 60kpa, thereby makes the pressure reduction of air throttle air inlet/outlet reach 60kpa, satisfies the test working condition requirement.So before measuring, will set vacuum tightness and error amount earlier, control module is according to the vacuum tightness PS that sets, output digital controlled signal 1, digital controlled signal 1 converts analog control signal 2 to by modulus/D/A converting circuit, analog control signal 2 by modulate circuit amplify, output control signal 3 after the filtering, frequency converter is according to these control signal 3 control of conversion motor slewing rates, variable-frequency motor drives vacuum pump and rotates, change the rate of air sucked in required size of vacuum pump by the rotating speed that changes vacuum pump, thereby controlling the vacuum tightness in vacuum tank and the barretter.When beginning to test, control module control vacuum pump is earlier bled with maximum rate, makes the interior practical vacuum degree PR of vacuum tank reach the lower limit PS-X that sets vacuum tightness as early as possible.Pressure transducer passes through the modulate circuit amplification filtering with the practical vacuum degree signal 4 of perception, modulus/D/A converting circuit outputs to control module after converting digital signal to, control module compares this practical vacuum degree PR and setting vacuum tightness PS, when practical vacuum degree PR reaches the lower limit PS-X that sets vacuum tightness, afterwards at (PS-X, PS+Y) regulate vacuum tightness PR with pid algorithm in the scope, make its be stabilized in as far as possible set vacuum tightness PS about (being no more than error range up and down), surpass after the PS+Y as PR, bleed for predetermined minimum of vacuum pump, make its range of adjustment that enters PID as early as possible (PS-X, PS+Y).So repeatedly, up to vacustat within preset range.The size of X, Y is set according to actual conditions, for example all can be made as 1kpa.
PID control is a kind of linear control method, it constitutes control deviation e (t)=r (t)-c (t) according to set-point r (t) and real output value c (t), ratio (P), integration (I) and the differential (D) of deviation are constituted controlled quentity controlled variable by linear combination, controlled device is controlled, so claim PID control.Its control law is:
u(t)＝Kp*e(t)+(1/Ti)∫e(t)dt+Td*de(t)/dt
Kp is a scale-up factor in the formula, and is relevant with static difference e (t), and scale-up factor is big more, and static difference is more little, but scale-up factor is big, causes vibration again easily, so its value should be decided on actual conditions.Ti is an integration time constant, and the introducing of integral element is in order to prevent vibration, reduce overshoot that integration time constant Ti will consider to determine according to this respect.Td is a derivative time constant, and the effect of differentiation element is the variation tendency according to deviation, provides in advance to regulate action, reduces lagging behind, so derivative time constant will be considered to determine according to this respect.
The effect of each correction link of PID is as follows:
1. proportional component: reflect the deviation signal e (t) of control system immediately pro rata, deviation is in case produce, and controller produces control action immediately, to reduce deviation.
2. integral element: be mainly used in the elimination static difference, improve the no margin of system.The power of integral action depends on integration time constant Ti, and Ti is big more, and integral action is weak more, otherwise then strong more.
3. differentiation element: can reflect the variation tendency (rate of change) of deviation signal, and can the deviation signal value become too big before, in system, introduce an effectively early stage corrected signal, thereby accelerate the responsiveness of system, reduce the adjusting time.
As shown in the above, the speed controling signal of variable-frequency motor finally is to convert by in current practical vacuum degree PR and difference e (t) the substitution pid algorithm of setting vacuum tightness PS, again in conjunction with the actual conditions of the vacuum source (vacuum tightness that reaches as concrete needs, the power of variable-frequency motor, the capacity of vacuum tank, surge tank) etc. what composite factor determined, and these parameters all need repeatedly be attempted in the debug process of reality and could finally determine.
Vacustat in barretter is being set vacuum tightness PS error range (PS-X, PS+Y) in the time of within, control module is gathered the flow velocity signal 5 of thermal gas flowmeter output, this flow velocity signal 5 can be a current signal, it also can be voltage signal, this flow velocity signal 5 outputs to control module after converting digital signal to by modulate circuit amplification filtering, modulus/D/A converting circuit, according to the long-pending gas mass flow that converts to of the flow area in the barretter, flow area herein is long-pending to be exactly the sectional area of the pipeline of barretter to control module with flow velocity signal.Can further include display and storer, control module shows the gas mass flow value and is kept in the storer by display.Can also the gas mass flow value be accessed from storer by control module later on.Modulus/D/A converting circuit, control module, display and storer can be integrated in the computing machine.
When test, precision to thermal gas flowmeter has certain requirement, the selection of precision is relevant with range, so need select the range of flowmeter according to the flow range of tested gas, be no more than 15g/s such as the gas flow maximum that will survey, will be when selecting range in conjunction with the long-pending flow rate corresponding value that is converted into of flow area, the greatest measurement that will make flowmeter then when selecting flowmeter is as far as possible near this Peak Flow Rate value (but necessarily big than this value).
The workflow of present embodiment may further comprise the steps as shown in Figure 2:
When 1) beginning to test, control module acceptance test person is at the setting vacuum tightness PS and the record of display interface input;
2) control module control by-pass stepper motor rotates, and the by-pass is opened by the aperture of setting;
3) the control vacuum pump is started working, and vacuum tank is vacuumized;
4) control module is gathered the interior practical vacuum degree PR of barretter of pressure transducer output, and compares with setting vacuum tightness PS, when practical vacuum degree PR reaches PS-X, and execution in step 5), X is for setting the lower limit error of vacuum tightness;
5) with practical vacuum degree PR with set vacuum tightness PS and make practical vacuum degree PR be positioned at that (PS-X is PS+Y) in the scope according to pid algorithm control of conversion motor speed;
6) judge whether practical vacuum degree PR is positioned at (PS-X is PS+Y) in the scope, if execution in step 7 then), if not then returning execution in step 5)
7) flow velocity signal under the gas standard situation in the barretter of control module collection thermal gas flowmeter output;
8) long-pending according to flow area, the flow velocity signal under the gas standard situation is converted to the gas mass flow value, and further rejecting abnormalities value and be presented at the result on the display and store;
9) when needs were tested the gas mass flow of throttle body of next by-pass aperture, repeating step 2 again) to 8); If do not need test, can turn off vacuum source, withdraw from test macro, the useful data of all collections is saved in the specified folder after finishing test automatically.
Specific embodiment two, different with embodiment one be, the against vacuum degree is regulated and is difficult to stablize the practical vacuum degree in the situation of setting about vacuum tightness, fluctuation is bigger, can consider increases surge tank in the gas flow guiding chamber, between vacuum tank and barretter, connect surge tank, surge tank helps making the vacustat in the gas flow guiding chamber setting within the error range of vacuum tightness, surge tank can be one, can be connect one by one a plurality of also, the vacuum tightness in barretter can be stabilized within the error range of setting vacuum tightness.
The present invention in like manner also can test the gas mass flow of main channel different opening except can be used for the gas mass flow of testing automobile throttle body by-pass different opening.Except air throttle air inflow was detected, the present invention can also test the characteristic of other throttle bodies such as throttle position sensor (TPS) output signal.
Claims (10)
1. vehicle air throttle air inflow test system is characterized in that comprising:
Vacuum source comprises being used for the gas flow guiding chamber that is connected with the gas outlet of throttle body that described vacuum source provides vacuum environment for the gas outlet of throttle body;
Pressure transducer is arranged in the gas flow guiding chamber, is used for the vacuum tightness in the measurement gas diversion cavity;
Thermal gas flowmeter is arranged in the gas flow guiding chamber, is used for the flow velocity under the status of criterion of test gas water conservancy diversion intracavity gas;
Control module, the vacuum tightness signal of response pressure sensor output, bleed according to this vacuum tightness and setting vacuum degree control vacuum source, and gather the flow velocity signal of thermal gas flowmeter output when being used within the vacustat in the gas flow guiding chamber is being set the vacuum tightness error range, and according to the long-pending gas mass flow that converts to of the flow area in the gas flow guiding chamber.
2. vehicle air throttle air inflow test system as claimed in claim 1, it is characterized in that: also comprise and can amplify modulate circuit with Filtering Processing to simulating signal, described modulate circuit provides vacuum source, pressure transducer and the thermal gas flowmeter path to control module.
3. vehicle air throttle air inflow test system as claimed in claim 2 is characterized in that: also comprise the modulus/D/A converting circuit that is connected between modulate circuit and the control circuit.
4. as each described vehicle air throttle air inflow test system in the claim 1 to 3, it is characterized in that: described gas flow guiding chamber comprises straight tube-like barretter and the vacuum tank that is connected.
5. vehicle air throttle air inflow test system as claimed in claim 4 is characterized in that: described gas flow guiding chamber also comprises at least one surge tank that is connected between barretter and the vacuum tank.
6. vehicle air throttle air inflow test system as claimed in claim 4, it is characterized in that: described vacuum source also comprises vacuum pump, variable-frequency motor and frequency converter, the signal of described frequency converter response control unit, the control of conversion motor rotates, described variable-frequency motor drives vacuum pump and rotates, and described vacuum pump is used for vacuum tank is bled.
7. vehicle air throttle air inflow test system as claimed in claim 6 is characterized in that: described control module also is used for linking to each other with the by-pass stepper motor of control throttle body by-pass aperture.
8. vehicle air throttle air inflow method of testing is characterized in that may further comprise the steps:
A1, control module control vacuum source are bled;
Vacuum tightness signal in B1, control module response pressure sensor senses and the gas flow guiding chamber that the throttle body gas outlet is connected, and with set vacuum tightness relatively, execution in step C1 in the time of within the vacustat in the gas flow guiding chamber is being set the vacuum tightness error range;
Flow velocity signal under the gas standard situation in the gas flow guiding chamber of C1, the output of control module collection thermal gas flowmeter;
D1, control module amass according to the flow area in the gas flow guiding chamber, convert the flow velocity signal under the gas standard situation to gas mass flow.
9. vehicle air throttle air inflow method of testing as claimed in claim 8 is characterized in that: control module may further comprise the steps the control of vacuum source in the described steps A 1:
Vacuum tightness signal in the gas flow guiding chamber of A11, the output of control module response pressure sensor compares practical vacuum degree in the gas flow guiding chamber and setting vacuum tightness, reaches the following execution in step A12 in limited time that sets the vacuum tightness error range when the practical vacuum degree;
A12, with the practical vacuum degree in the gas flow guiding chamber with set the controlling value that vacuum tightness calculates according to pid algorithm;
A13, with the rotating speed of this controlling value in conjunction with the variable-frequency motor of the concrete parameter control vacuum source of vacuum source;
The rate of air sucked in required of A14, variable-frequency motor control vacuum pump.
10. vehicle air throttle air inflow method of testing as claimed in claim 8 or 9, it is characterized in that further comprising the steps of: control module control by-pass stepper motor rotates, and corresponding by-pass aperture is set, and execution in step A1 is to D1 then.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100217090A CN100443864C (en) | 2005-09-15 | 2005-09-15 | Vehicle air throttle air inflow test system and testing method |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100217090A CN100443864C (en) | 2005-09-15 | 2005-09-15 | Vehicle air throttle air inflow test system and testing method |
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| CN1932453A CN1932453A (en) | 2007-03-21 |
| CN100443864C true CN100443864C (en) | 2008-12-17 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102121873B (en) * | 2010-12-20 | 2012-02-22 | 四川红光汽车机电有限公司 | Throttle body negative pressure testing device |
| CN102126404B (en) * | 2011-01-26 | 2012-11-14 | 中国计量学院 | Anti-explosion air valve exhaust pressure testing and regulating equipment |
| CN104635776A (en) * | 2013-11-13 | 2015-05-20 | 中国科学院沈阳科学仪器股份有限公司 | Wide-range pressure control system and method applied to vacuum equipment |
| CN105186952A (en) * | 2015-07-31 | 2015-12-23 | 芜湖真空科技有限公司 | Control system for stabilizing vacuum degree of vacuum chamber |
| CN106706289A (en) * | 2016-12-15 | 2017-05-24 | 中国航空工业集团公司西安飞机设计研究所 | Automatic identification system for characteristic parameters of electronic control valve of environment control system |
| CN111373135A (en) * | 2017-08-09 | 2020-07-03 | 韦弗知识产权有限公司 | General aviation carburetor test analysis device |
| TW202035873A (en) * | 2019-03-29 | 2020-10-01 | 亞台富士精機股份有限公司 | Control method and vacuum system |
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| US4041777A (en) * | 1973-03-08 | 1977-08-16 | Karl Weiss - Giessen, Fabrik Elektrophysikalischer Geraete, Werk Lindenstruth | Method and apparatus for testing carburetors |
| JPS6379015A (en) * | 1986-09-22 | 1988-04-09 | Masato Saito | Pressure and flowmeter |
| JPH0282000A (en) * | 1988-09-20 | 1990-03-22 | Nippon Ferrofluidics Kk | Operational condition detecting method for turbo molecular pump |
-
2005
- 2005-09-15 CN CNB2005100217090A patent/CN100443864C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4041777A (en) * | 1973-03-08 | 1977-08-16 | Karl Weiss - Giessen, Fabrik Elektrophysikalischer Geraete, Werk Lindenstruth | Method and apparatus for testing carburetors |
| JPS6379015A (en) * | 1986-09-22 | 1988-04-09 | Masato Saito | Pressure and flowmeter |
| JPH0282000A (en) * | 1988-09-20 | 1990-03-22 | Nippon Ferrofluidics Kk | Operational condition detecting method for turbo molecular pump |
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