CN1952641A - Test macro of engine pedestal and method for constant-velocity control - Google Patents
Test macro of engine pedestal and method for constant-velocity control Download PDFInfo
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- CN1952641A CN1952641A CN 200510021930 CN200510021930A CN1952641A CN 1952641 A CN1952641 A CN 1952641A CN 200510021930 CN200510021930 CN 200510021930 CN 200510021930 A CN200510021930 A CN 200510021930A CN 1952641 A CN1952641 A CN 1952641A
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- 238000005259 measurement Methods 0.000 claims abstract description 18
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Abstract
A measurement system and its constant speed control means of the engine pedestal is disclosed that comprises torque sensor (2), motor (3), computer tested and controlled system (4), A.C.convertor (5); the computer tested and controlled system is separately connected with the measured engine, the A.C.convertor and the torque sensor; the A.C.convertor is connected with the motor; one end of the torque sensor (2) is fixed coaxially coupling with the output shaft of the motor (3), the other end of the torque sensor is fixed coaxially coupling with the output shaft of the engine. The measured engine is stabilized at point of set rotational speed by controlling the speed of the engine directly, the control precision is high, and the fluctuation is small, the process of regulation is stable, the maximum fluctuation of all the point with different rotational speed is about 1rpm. The invention resolves the problem of instability of set rotational speed in rough operating mode of engine performance reduction, single cylinder blow off and oil shortage for short time, and satisfies the test requirement of the engine authentically.
Description
[technical field]
The present invention relates to a kind of engine bench test system and be used for the method for control speed of testing automobile engine performance on stand.
[background technology]
In the motor car engine bench test, it is the gordian technique place of carrying out experiments such as engine test bench characteristic, part throttle characteristics that the constant speed of engine is controlled always.No matter adopt which kind of dynamometer machine, it is direct controlling object that conventional control method all adopts the load torque with dynamometer machine, by the variation that the size of torque control mode dynamic adjustments load torque goes the power of balanced engine to export, start function to be stabilized in the rotating speed point of certain setting thereby allow.By practice; the control result who finds this method is not very good; performance decline, single cylinder cutoff appear at engine, in short-term during situation such as oil starvation; the quick variation of its power output can allow system instability extremely occur usually; the fluctuation of speed is big; in these cases, performance parameters such as the moment of torsion of test engine that can't be timely, correct, power, thus make experiment lose meaning to a certain extent.
[summary of the invention]
Purpose of the present invention is exactly in order to overcome the above problems, and the constant speed control method of a kind of engine bench test system is provided, and makes tested engine speed stable and controllable, and parameter testing accurately and timely.
For achieving the above object, the present invention proposes a kind of engine bench test system, comprises torque sensor 2, motor 3, computer measurement and control system 4, AC converter 5; Described tested engine, AC converter, torque sensor are electrically connected with described computer measurement and control system respectively, and described computer measurement and control system is used to gather the parameters of engine, motor, control the operating mode of described engine and motor; Described AC converter is electrically connected with described motor, is used to control the output torque and the rotating speed of described motor; The output shaft coaxial rigid connection of described torque sensor 2 one ends and described motor 3, the other end is used for the output shaft coaxial rigid connection with tested engine, is used to gather the output torque of engine and motor.
Above-mentioned engine bench test system, described motor is an alternating-current variable frequency motor, described AC converter is the four-quadrant AC converter.
The present invention proposes the constant speed control method of a kind of engine bench test system, comprise the steps: 1) tested engine and motor are passed through the torque sensor coaxial rigid connection, 2) variation of the real-time detection of engine of torque sensor, motor output torque, 3) system is according to the variation of engine output torque, by speed regulator the output torque of motor is regulated accordingly, made tested engine be stabilized in the rotating speed point of setting.
The constant speed control method of above-mentioned engine bench test system, described motor adopts alternating-current variable frequency motor, and described speed regulator adopts the four-quadrant AC converter.
The constant speed control method of described engine bench test system, in described step 3), when described engine is in the operating mode of normal outputting power, under the effect of speed regulator, motor speed direction and engine speed direction are consistent, and the torque direction of motor is opposite with rotating speed, and its size changes according to engine output power to be adjusted, and machine operation is at generating state.In described step 3), when the operating mode of single cylinder moment cutoff appearred in described engine, under the effect of speed regulator, motor dynamically reduced output torque simultaneously.In described step 3), when flame-out suddenly operating mode appears in described engine, under the effect of speed regulator, to change into consistently with rotary speed direction motor output torque directional smoothing, machine operation is at motoring condition.
The motor speed control technology that utilization of the present invention is very ripe by alternating current generator is carried out stepless speed regulation, realizes the constant speed control to tested engine, the control accuracy height, and dynamic response is fast, and adaptability is strong, uses simple.
The present invention adopts the power measurement arrangement of alternating-current variable frequency motor as engine pedestal, utilize the advantage of frequency converter, the constant speed of alternating-current variable frequency motor is controlled the constant speed control that realizes engine with four-quadrant frequency converter, with alternating-current variable frequency motor as load motor, size and Orientation with the output torque of the speed regulator dynamic adjustments alternating-current variable frequency motor of four-quadrant frequency converter makes tested engine be stabilized in the rotating speed point of setting; Compare with the method for direct control alternating current generator moment of torsion, the rotating speed control accuracy height of speed control method, it is little to fluctuate, and adjustment process is steady, and the maximum fluctuation of each rotating speed point is about 1rpm.Solved the torque control mode engine performance decline, single cylinder cutoff, in short-term can not be well during bad working environments such as oil starvation with stabilization of speed in the problem of setting rotating speed, really satisfy the requirement of engine test.
[description of drawings]
Also the present invention is described in further detail in conjunction with the accompanying drawings below by specific embodiment.
Fig. 1 is a system of the present invention composition diagram.
Fig. 2 is the operation area figure of four-quadrant frequency converter drive motor.
Fig. 3 is the four-quadrant frequency converter theory diagram.
[embodiment]
The system of the constant speed control method that is used for the engine bench test system that the invention proposes forms as shown in Figure 1.Be respectively tested engine 1, torque sensor 2, alternating-current variable frequency motor 3 (hereinafter to be referred as motor), computer measurement and control system 4, four-quadrant AC converter 5 (hereinafter to be referred as frequency converter), wherein engine 1, torque sensor 2, alternating-current variable frequency motor 3 three's coaxial rigid connection.
It is simple in structure that alternating-current variable frequency motor 3 has kept common asynchronous moter, the characteristics that maintenance is little, the mode that adopts forced ventilation to cool off reduces the thermal value of motor when the slow-speed of revolution, structural design takes into full account the supplied character of frequency converter and makes optimized design, is not subjected to the restriction of common frequency power network.
Computer measurement and control system 4 is mainly finished the collection of various parameters, the functions such as control of process of the test.The acquisition control system that computer measurement and control system 4 adopts based on PC, constitute by PC and acquisition system, capture card in the system is finished the collection of physical quantitys such as current rotating speed, moment of torsion, can give the rotating speed control interface of frequency converter simultaneously according to the size output control corresponding amount of setting rotating speed, thereby the control rotating speed of motor, these operations are all finished in the corresponding interface of PC.
Four-quadrant AC converter 5 is different from single quadrant frequency converter, can drive alternating current generator and be operated in as shown in Figure 2 four quadrant areas, partly is made up of rectifying part shown in Figure 3 and inversion.It provides various rotating speed control interfaces, as analog quantity, communication etc., can be connected with the corresponding interface of capture card in the computer measurement and control system with this, to realize the control to rotating speed.
Need finish according to the following steps when testing:
By engine ignitor engine 1 is started to the idling point, can carry out links such as the zeroing, correction of TT﹠C system this moment.
Controlled quentity controlled variable is outputed to the rotating speed control interface of frequency converter 5 by computer measurement and control system 4, make the rotating speed of alternating-current variable frequency motor 3 accelerate to certain speed point greater than engine idle, this speed point is set by computer measurement and control system 4, and guarantees that rotary speed direction is consistent with the engine speed direction.In this process, utilize the rotating-speed tracking function of frequency converter, make it when operation, can dynamically follow the rotating speed of present engine and accelerate to the setting rotating speed, and this moment alternating-current variable frequency motor 3 under the adjusting of frequency converter 5, the driving direction that guarantees motor 3 is consistent with the crankshaft rotating direction of engine 1, the torque direction of motor 3 then adapts to the different operating modes of engine 1 and changes dynamically, stably, allow engine running speed all-the-time stable at the rotating speed point of setting, this is " four-quadrant " meaning of four-quadrant frequency converter 5 just also.The direction of supposing motor speed this moment is a positive dirction, then this moment the motor output torque direction can adapt to the power output of engine, in 1,4 quadrants as shown in Figure 2, switch, promptly switch in electronic, two kinds of duties of generating, and when generating state, the energy that generates electricity is returned electrical network, when velocity-stabilization, the parameter that record is relevant.
When engine 1 is in the operating mode of normal outputting power, under the effect of the speed regulator of frequency converter 5, it is consistent with the rotary speed direction of tested engine that the rotary speed direction of alternating-current variable frequency motor 3 keeps, and torque direction can keep the direction opposite with rotating speed, the size of moment of torsion can be according to the variation of engine 1 outputting power size and is dynamically regulated, thereby allows the driving rotating speed (also being the running speed of engine 1) of motor 3 maintain the rotating speed point of setting all the time; And when the operating mode of single cylinder moment cutoff appears in engine 1, motor 3 also can dynamically reduce its output torque simultaneously under the effect of the speed regulator of frequency converter 5, make rotating speed still maintain the set point that we need, and computer measurement and control system can monitor corresponding power, the isoparametric variation of moment of torsion 4 this moments, thereby reflect the working conditions change of engine 1 in real time, satisfy requirement of experiment; And when the suddenly flame-out operating mode of engine occurring, under the effect of the speed regulator of frequency converter 5, it is consistent with the rotary speed direction of tested engine that the rotary speed direction of motor 3 still keeps, and that the output torque direction can become fast, smoothly is consistent with rotary speed direction, thereby continue to keep the rotating speed point that rotating speed is being set, and the generation that from computer measurement and control system 4, can real-time judge goes out this operating mode by moment of torsion, the isoparametric variation of power, satisfy requirement of experiment.
According to requirement of experiment, change the size of setting rotating speed by computer measurement and control system 4, can finish the speed characteristic test of engine in full speed range; At a certain setting rotating speed point, change the throttle size by computer measurement and control system 4, can finish certain load test of engine.Power of motor is 132KW in the embodiment of the invention, four-quadrant frequency converter power is 160KW, and the torque sensor range is ± 500N.M tested engine capacity 90KW, move above two months continuously by the enterprises input, facts have proved to have reached goal of the invention of the present invention.
Claims (7)
1, a kind of engine bench test system is characterized in that: comprise torque sensor (2), motor (3), computer measurement and control system (4), AC converter (5); Described tested engine, AC converter, torque sensor are electrically connected with described computer measurement and control system respectively, and described computer measurement and control system is used to gather the parameters of engine, motor, control the operating mode of described engine and motor; Described AC converter is electrically connected with described motor, is used to control the output torque and the rotating speed of described motor; The output shaft coaxial rigid connection of described torque sensor one end and described motor, the other end are used for the output shaft coaxial rigid connection with tested engine, are used to gather the output torque of engine and motor.
2, engine bench test as claimed in claim 1 system, it is characterized in that: described motor is an alternating-current variable frequency motor, described AC converter is the four-quadrant AC converter.
3, the constant speed control method of a kind of engine bench test system, it is characterized in that: comprise the steps: 1) tested engine and motor are passed through the torque sensor coaxial rigid connection, 2) variation of the real-time detection of engine of torque sensor, motor output torque, 3) system is according to the variation of engine output torque, by speed regulator the output torque of motor is regulated accordingly, made tested engine be stabilized in the rotating speed point of setting.
4, the constant speed control method of engine bench test as claimed in claim 3 system is characterized in that: described motor adopts alternating-current variable frequency motor, and described speed regulator adopts the four-quadrant AC converter.
5, as the constant speed control method of claim 3 or 4 described engine bench test systems, it is characterized in that: in described step 3), when described engine is in the operating mode of normal outputting power, the rotary speed direction of rotating speed of motor direction and tested engine is consistent under the effect of speed regulator, and the torque direction of motor is opposite with rotary speed direction, its size changes according to engine output power to be adjusted, and machine operation is at generating state.
6, as the constant speed control method of claim 3 or 4 described engine bench test systems, it is characterized in that: in described step 3), when the operating mode of single cylinder moment cutoff appearred in described engine, under the effect of speed regulator, motor dynamically reduced the size of output torque simultaneously.
7, as the constant speed control method of claim 3 or 4 described engine bench test systems, it is characterized in that: in described step 3), when flame-out suddenly operating mode appears in described engine, under the effect of speed regulator, change into consistently with rotary speed direction, machine operation is at motoring condition the directional smoothing of motor output torque.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100219306A CN100526837C (en) | 2005-10-17 | 2005-10-17 | Test macro of engine pedestal and method for constant-velocity control |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100219306A CN100526837C (en) | 2005-10-17 | 2005-10-17 | Test macro of engine pedestal and method for constant-velocity control |
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| CN1952641A true CN1952641A (en) | 2007-04-25 |
| CN100526837C CN100526837C (en) | 2009-08-12 |
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| CNB2005100219306A Expired - Fee Related CN100526837C (en) | 2005-10-17 | 2005-10-17 | Test macro of engine pedestal and method for constant-velocity control |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102749203A (en) * | 2011-04-21 | 2012-10-24 | 浙江派尼尔机电有限公司 | Testing method, device and system for marine engine |
| CN101878417B (en) * | 2007-11-30 | 2012-11-21 | 株式会社明电舍 | Engine bench system control system |
| CN103900822A (en) * | 2013-06-21 | 2014-07-02 | 上海汽车集团股份有限公司 | Flexible testing system for engine pedestal performance |
| CN104697799A (en) * | 2015-03-10 | 2015-06-10 | 无锡惠科电工高新技术有限公司 | Automatic load increase testing system and testing method for engine |
| CN104990710A (en) * | 2015-05-19 | 2015-10-21 | 成都诚邦动力测试仪器有限公司 | Engine measurement and control system based on constant current source driving |
| CN106795825A (en) * | 2014-10-13 | 2017-05-31 | 标致雪铁龙集团 | Interrupt the method to fuel oil is sprayed in explosive motor |
| CN109855876A (en) * | 2018-12-24 | 2019-06-07 | 重庆优摩特科技有限公司 | Method and device thereof for engine power detection |
| CN111076938A (en) * | 2019-12-30 | 2020-04-28 | 凯迈(洛阳)机电有限公司 | Control method of starter load control system based on electric dynamometer |
| CN112346399A (en) * | 2020-10-26 | 2021-02-09 | 无锡沃尔福汽车技术有限公司 | Switching method for measuring oil consumption of engine rack |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2778162B1 (en) * | 1998-05-04 | 2000-07-13 | Ecole D Ingenieurs Du Canton D | CONTROL DEVICE FOR ELECTRIC VEHICLE |
| CN2621290Y (en) * | 2003-05-10 | 2004-06-23 | 清华大学 | Parallel mixed dynamic electric vehicle multi-energy power system stage testing mechanism |
-
2005
- 2005-10-17 CN CNB2005100219306A patent/CN100526837C/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101878417B (en) * | 2007-11-30 | 2012-11-21 | 株式会社明电舍 | Engine bench system control system |
| CN102749203A (en) * | 2011-04-21 | 2012-10-24 | 浙江派尼尔机电有限公司 | Testing method, device and system for marine engine |
| CN103900822A (en) * | 2013-06-21 | 2014-07-02 | 上海汽车集团股份有限公司 | Flexible testing system for engine pedestal performance |
| CN106795825A (en) * | 2014-10-13 | 2017-05-31 | 标致雪铁龙集团 | Interrupt the method to fuel oil is sprayed in explosive motor |
| CN106795825B (en) * | 2014-10-13 | 2020-03-31 | 标致雪铁龙集团 | Method for interrupting fuel injection in internal combustion engine |
| CN104697799A (en) * | 2015-03-10 | 2015-06-10 | 无锡惠科电工高新技术有限公司 | Automatic load increase testing system and testing method for engine |
| CN104990710A (en) * | 2015-05-19 | 2015-10-21 | 成都诚邦动力测试仪器有限公司 | Engine measurement and control system based on constant current source driving |
| CN109855876A (en) * | 2018-12-24 | 2019-06-07 | 重庆优摩特科技有限公司 | Method and device thereof for engine power detection |
| CN111076938A (en) * | 2019-12-30 | 2020-04-28 | 凯迈(洛阳)机电有限公司 | Control method of starter load control system based on electric dynamometer |
| CN111076938B (en) * | 2019-12-30 | 2024-04-26 | 凯迈(洛阳)机电有限公司 | Control method of starter load control system based on electric dynamometer |
| CN112346399A (en) * | 2020-10-26 | 2021-02-09 | 无锡沃尔福汽车技术有限公司 | Switching method for measuring oil consumption of engine rack |
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| Publication number | Publication date |
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| CN100526837C (en) | 2009-08-12 |
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Assignee: SHENZHEN BYD AUTO R&D Co.,Ltd. Assignor: BYD Co.,Ltd. Contract record no.: 2011440020513 Denomination of invention: Test macro of engine pedestal and method for constant-velocity control Granted publication date: 20090812 License type: Exclusive License Open date: 20070425 Record date: 20111221 |
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Change date: 20150427 Contract record no.: 2011440020513 Assignee after: BYD AUTO Co.,Ltd. Assignee before: SHENZHEN BYD AUTO R&D Co.,Ltd. |
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