CN101368875B - Testing bench frame and method for engine with variable compression ratio - Google Patents
Testing bench frame and method for engine with variable compression ratio Download PDFInfo
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- CN101368875B CN101368875B CN2008100248406A CN200810024840A CN101368875B CN 101368875 B CN101368875 B CN 101368875B CN 2008100248406 A CN2008100248406 A CN 2008100248406A CN 200810024840 A CN200810024840 A CN 200810024840A CN 101368875 B CN101368875 B CN 101368875B
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Abstract
The invention belongs to the technical field of automobile manufacturing technology and equipment and discloses an engine test bench with variable compression ratio; a hydraulic transmission system is arranged in the test bench; the support plates at both ends of a cylinder body (11) are connected through a hydraulic cylinder (1) in the hydraulic transmission system, namely, one support plate is connected with the hydraulic cylinder body, while the other support plate is connected with a hydraulic cylinder piston rod; and one of the support plates is fixed on the test bench. With the technical proposal, the invention can continuously achieve compression ratio changes and can shorten and determine the ideal compression ratio cycle of the engine; the invention can quickly obtain the influence parameters of the compression ratio to the engine combustion performance; the invention expands the application scope and can carry out the bench test for gasoline engines and diesel engines; and based on needs, the cylinder body can be made transparent so as to achieve combustion process visualization.
Description
Technical field
The invention belongs to the technical field of automobile making technological equipment, relate to the testing experiment equipment of motor car engine, more particularly, the present invention relates to a kind of threst stand of variable compression ratio.In addition, the invention still further relates to the test method that described threst stand adopts.
Background technology
Strict more and client is to the raising of engine economy requirement along with automobile emission regulation, improves the striving direction in the emission behavior of engine and the Automobile Design and Manufacturing that the fuel-economy performance has become each big automobile manufacturing enterprise.Its main means concentrate on aftertreatment (external purification) and two aspects of burning optimization (emission controls by improving combustion).Aspect external purification, obtained at present very satisfied achievement,, can realize the standard in Europe 5 or Europe 6 as SCR, DPF etc.Aspect emission controls by improving combustion, a variety of new combustion models have appearred now, such as HCCI, MK and NADI system.These new combustion models mainly are the formation of pursuing low-temperature burning and homogeneous mixed steam, promptly require low charge temperature and uniform mixed steam, also have lower ratio of compression, to reduce NOx and PM discharging.
Novel low-temperature burning system requires to adopt different ratio of compression when different operating modes.In, during underload,, require to reduce temperature of combustion and explosion pressure in order to improve the emission level of engine, need to adopt less ratio of compression; And when full load,, need to adopt big compression recently to improve the power and the moment of torsion of engine in order to guarantee the performance of engine.This under different working conditions, to the difference that requires of ratio of compression, make the application of changeable compression ratio technique on engine be subjected to paying close attention to widely.Realizing variable compression ratio before the application on the engine, must be earlier by verification experimental verification, so becoming to the realization of this technology, the bench test system of variable compression ratio is starved of.For the low-temperature burning technology is realized in the full load mode scope, the application of changeable compression ratio technique is necessary.Be accompanied by of the requirement of engine combustion characteristic, also need a cover can realize the bench test system of the engine of variable compression ratio naturally variable compression ratio.
At present commonplace abroad to the research of variable compression ratio engine, but can realize that the achievement of variable compression ratio function is fewer, and complex structure.Especially at test-bed system this respect, external technology comparative maturity does not still substantially also have similar techniques at home.Domestic at present also in the novel combustion mode of the relevant engine of research, to improve rules to the requirement of discharging and client requirement to performance and economy.Want to realize the low-temperature burning in the full load mode scope, changeable compression ratio technique is absolutely necessary.Because this aptitude to burn has determined that different operating points are different to the requirement of firing chamber boundary condition.In order to satisfy the testing requirements of engine variable ratio of compression, it is indispensable that a kind of variable compression ratio platform system also just becomes.
Summary of the invention
First problem to be solved by this invention provides a kind of threst stand of variable compression ratio, its objective is in the engine rig test process, can realize the adjusting of ratio of compression easily, obtains the test parameters under the different ratio of compression.
To achieve these goals, the technical scheme that the present invention takes is: the threst stand of this variable compression ratio that is provided, the performance test that is used for engine, described engine comprises cylinder block, piston, connecting rod and bent axle, parallel with two the respectively back up pad in the two ends of described cylinder block connects, in described test-bed, establish Hydraulic Power Transmission System, between the back up pad at described cylinder block two ends, connect by the hydraulic cylinder in the described Hydraulic Power Transmission System, promptly a back up pad is connected with hydraulic cylinder, another is connected with hydraulic cylinder piston rod, and one of them back up pad and described test-bed are fixed.
For making the present invention more perfect, more detailed and concrete technical scheme below also further having proposed with regard to technique scheme, to obtain best practical function, realize goal of the invention better, and improve novelty of the present invention and creativeness:
Described two back up pads are horizontally disposed with, wherein one is lower supporting plate, be fixed on the test-bed, described cylinder block is connected with lower supporting plate by the cylinder block support set, cylinder block is fixedlyed connected with the cylinder block support set, between described cylinder block support set and the lower supporting plate for being in axial sliding connection, fixedly connected with upper backup pad in the upper end of described cylinder block, the stationkeeping of described crankshaft center line on test-bed, and below lower supporting plate, be connected with piston by described connecting rod.
The upper end of above-described cylinder block and upper backup pad syndeton are: establish cylinder head assembly, and fixedly connected with cylinder block, upper backup pad respectively.
Above-described Hydraulic Power Transmission System also is provided with hydraulic pump, hydraulicdirectional control valve, in-line, oil return line and hydraulic oil pipe, and described hydraulic pump communicates with two oil pockets of described hydraulic cylinder respectively by in-line, hydraulicdirectional control valve and hydraulic oil pipe.
Above-described hydraulic pump is by the hydraulic servo motor-driven; Described hydraulicdirectional control valve is the reversal valve by Electromagnetic Drive.
Establish platform system ECU (Electrical Control Unit) (ECU) on the threst stand of above-described variable compression ratio.Following technical scheme is evenly relevant with this ECU (Electrical Control Unit):
Platform system ECU (Electrical Control Unit) (ECU) is connected with the hydraulic servo motor with described hydraulicdirectional control valve respectively by signal line, sends operating instruction to hydraulicdirectional control valve and hydraulic servo motor respectively; On described in-line, establish hydraulic system pressure sensor, and be connected with described platform system ECU (Electrical Control Unit) (ECU) respectively, transmit the output oil pressure signal of hydraulic pump to platform system ECU (Electrical Control Unit) (ECU) by signal line.
Establish air inlet pressure sensor, in-cylinder pressure sensor and temperature sensor on the above-described cylinder head assembly, the sensor is connected with described platform system ECU (Electrical Control Unit) (ECU) by signal line respectively, transmits the signal of respective physical amount to platform system ECU (Electrical Control Unit) (ECU).
Between described upper backup pad and lower supporting plate, if guidepost, on lower supporting plate, establish the guide pin bushing that matches with described guidepost, and form with guidepost and to be slidingly matched, on described guide pin bushing, establish the stand state sensor,, and be connected with described platform system ECU (Electrical Control Unit) (ECU) by signal line, transmit the signal of the distance size between upper backup pad and the lower supporting plate to platform system ECU (Electrical Control Unit) (ECU).
On described bent axle, establish speed probe, and be connected with described platform system ECU (Electrical Control Unit) (ECU), transmit the tach signal of engine crankshaft to platform system ECU (Electrical Control Unit) (ECU) by signal line.
Second problem to be solved by this invention be, the test method that threst stand adopted of above-mentioned variable compression ratio is provided, and its goal of the invention is identical with technique scheme.The concrete technical scheme of this method is:
Be installed in each sensor on the described test-bed, give platform system ECU (Electrical Control Unit) (ECU) the real-time working feedback of status of engine;
The duty that platform system ECU (Electrical Control Unit) (ECU) is come the analysis and judgement engine according to the parameter of each sensor feedback, whether decision needs to change ratio of compression or other execution parameter;
Change ratio of compression if desired, platform system ECU (Electrical Control Unit) (ECU) sends switching signal for hydraulic pressure servomotor and hydraulicdirectional control valve so, gives the hydraulic cylinder fuel feeding, makes hydraulic cylinder promote cylinder head and rises or descend, so that the cylinder ratio of compression changes;
Adjust the lift of the hydraulic cylinder on the test-bed, make it to adjust to the proper compression ratio, burning can stably be carried out;
If do not need to change ratio of compression, hydraulicdirectional control valve is in meta automatically so, the hydraulicdirectional control valve locking, and the piston rod locking of hydraulic cylinder, the cylinder position stability is constant;
By adjusting the duty that fuel injector, EGR valve, eddy current operation valve change engine, obtain the engine operating parameter under the different conditions.
Adopt technique scheme, make the present invention realize the change of ratio of compression serially; Can shorten the ideal compression ratio cycle of determining engine; Can obtain ratio of compression quickly to engine combustion Effect on Performance parameter; Enlarge range of application, both can do the bench test of gasoline engine, also can do the bench test of diesel engine; As required, cylinder body can also be made transparently, realize that combustion process is visual.System architecture is simple, and control is convenient.
Description of drawings
Below expressed content of each width of cloth accompanying drawing of this instructions and the mark among the figure are made brief description:
Fig. 1 is structure of the present invention and signal transitive relation synoptic diagram;
Fig. 2 is the structural representation of the installation engine of the test-bed among the present invention;
Fig. 3 reduces the view of ratio of compression when testing for the test-bed among the present invention;
The view of increasing compression ratio when Fig. 4 tests for the test-bed among the present invention.
Be labeled as among the figure: 1, hydraulic cylinder, 2, the cylinder block support set, 3, hydraulic oil pipe, 4, stop nut, 5, connecting rod, 6, bent axle, 7, lower supporting plate, 8, guidepost, 9, upper backup pad, 10, cylinder head assembly, 11, cylinder block, 12, piston, 13, air inlet pressure sensor, 14, in-cylinder pressure sensor, 15, temperature sensor, 16, the stand state sensor, 17, the stand state sensor, 18, speed probe, 19, hydraulic system pressure sensor, 20, the hydraulic servo motor, 21, hydraulicdirectional control valve, 22, fuel tank, 23, in-line, 24, oil return line, 25, hydraulic pump, 26, platform system ECU (Electrical Control Unit) (ECU), 27, guide pin bushing.
Embodiment
Contrast accompanying drawing below, by description to embodiment, to effect and principle of work, the manufacturing process of the mutual alignment between the shape of the specific embodiment of the present invention such as related each member, structure, the each several part and annexation, each several part and manipulate method etc., be described in further detail, inventive concept of the present invention, technical scheme had more complete, accurate and deep understanding to help those skilled in the art.
The of the present invention structure expressed as Fig. 1, Fig. 2, the present invention is a kind of threst stand of variable compression ratio, be used for performance test to engine, described engine comprises cylinder block 11, piston 12, connecting rod 5 and bent axle 6, and parallel with two the respectively back up pad in the two ends of described cylinder block 11 connects.
In order to solve the problem that exists at the described present known technology of this instructions background technology part and to overcome its defective, be implemented in the engine rig test process, can carry out the adjusting of ratio of compression easily, obtain the goal of the invention of the test parameters under the different ratio of compression, the technical scheme that the present invention takes is:
Establish Hydraulic Power Transmission System in the threst stand of this variable compression ratio provided by the present invention, between the back up pad at described cylinder block 11 two ends, connect by the hydraulic cylinder in the described Hydraulic Power Transmission System 1, promptly a back up pad is connected with hydraulic cylinder, another is connected with hydraulic cylinder piston rod, and one of them back up pad and described test-bed are fixed.
Adopt hydraulic transmission technology, hydraulic cylinder 1 promotion engine cylinder cover combination in the hydraulic system is moved up and down, driving cylinder block 11 simultaneously moves up and down together, and then change piston 12 tops are to the distance of cylinder cap lower plane, to realize changing combustion chamber volume, reach the ratio of compression purpose that changes engine.Because the axial location of bent axle 6 is constant.The key that this platform system changes ratio of compression is exactly, changed the distance of top land to the cylinder cap lower plane, combustion chamber volume changed, the change of realization ratio of compression.As shown in Figure 3 and Figure 4, when hydraulic cylinder 1 raise, the volume of firing chamber increased, and ratio of compression reduces; When hydraulic cylinder 1 descended, combustion chamber volume reduced, and ratio of compression increases.
Adopt Hydraulic Power Transmission System to carry out the control of cylinder compression ratio, be active in one's movements, operate steadily, adjustable continuously, control is convenient, reliable operation.Be easy to regulate, control by ECU (Electrical Control Unit).Realize the change of ratio of compression serially; Can shorten the ideal compression ratio cycle of determining engine; Can obtain ratio of compression quickly to engine combustion Effect on Performance parameter; Enlarge range of application, both can do the bench test of gasoline engine, also can do the bench test of diesel engine; In addition, also can be as required, cylinder body is made transparent, realize the visual of combustion process.
For making clearer and at length introducing embodiments of the present invention,, the present invention is carried out concrete description below by some exemplifying embodiments of being recommended:
Embodiment one: the connection of cylinder, fixed form.
Two back up pads are horizontally disposed with, wherein one is lower supporting plate 7, be fixed on the test-bed, cylinder block 11 is connected with lower supporting plate 7 by cylinder block support set 2, cylinder block 11 is fixedlyed connected with cylinder block support set 2, for being in axial sliding connection, fixedly connected with upper backup pad 9 in the upper end of described cylinder block 11 between described cylinder block support set 2 and the lower supporting plate 7.
In the bottom of hydraulic cylinder 1,, prevent that motion amplitude is excessive and skid off from lower supporting plate 7 with stop nut 4 lockings.
Said structure is guaranteed to carry out relative motion between cylinder block 11 and the lower supporting plate 7, realizes the change of ratio of compression.
Embodiment two: installation position of drive shafting and be connected and fixed mode.
The stationkeeping of the axis of bent axle 6 on test-bed, and below lower supporting plate 7, be connected with piston 12 by connecting rod 5.
Since the invariant position with respect to test-bed of bent axle 6 axis, and cylinder block is adjustable about in the of 11, so realized the adjustable of cylinder compression ratio.
Embodiment three: the upper end syndeton of cylinder block 11 (being cylinder head assembly 10).
The upper end of cylinder block 11 and upper backup pad 9 syndetons are: establish cylinder head assembly 10, and fixedly connected with cylinder block 11, upper backup pad 9 respectively.
Wherein cylinder block 11 and cylinder head assembly 10 are to link together by cylinder bolt, the purpose of this connected mode, and the firstth, for sealed combustion chamber; The secondth, for make cylinder block 11 can with 10 1 liftings of cylinder cap assembly.
Embodiment four: hydraulic system structure.
Described Hydraulic Power Transmission System also is provided with hydraulic pump 25, hydraulicdirectional control valve 21, in-line 23, oil return line 24 and hydraulic oil pipe 3, and described hydraulic pump 25 communicates with two oil pockets of described hydraulic cylinder 1 respectively by in-line 23, hydraulicdirectional control valve 21 and hydraulic oil pipe 3.
The hydraulic circuit of this Hydraulic Power Transmission System is: when hydraulicdirectional control valve 21 is in a certain working position, drive hydraulic pump 25 by hydraulic servo motor 20, from fuel tank 22 pump oil, enter an oil pocket of hydraulic cylinder 1 by in-line 23, hydraulicdirectional control valve 21, hydraulic oil pipe 3, realize the motion of piston rod; At this moment, the hydraulic oil of hydraulic cylinder 1 oil pocket returns fuel tank 22 by hydraulicdirectional control valve 21 and oil return line 24.When piston rod needs counter motion, only hydraulicdirectional control valve 21 need be changed to another working position and get final product.Hydraulicdirectional control valve 21 is the solenoid directional control valves by ECU control.
Embodiment five: the hydraulic system drives structure.
The purpose of servo apply hydraulic pressure motor 20 is, can realize by the control of platform system ECU (Electrical Control Unit) 26 (ECU) its duty, as start, stop, the size of fuel supply flow rate etc., satisfy when the regulate the speed requirements of speed of different compressions.
Embodiment six: the hydraulic system reversing mode.
Adopting the purpose of the reversal valve of Electromagnetic Drive is can realize making it be in different positions by the control of platform system ECU (Electrical Control Unit) 26 (ECU) to its duty, as working position (position, a left side, right position) or meta (quitting work).This hydraulicdirectional control valve 21 is the 3-position 4-way solenoid directional control valve, is to be in the meta position under normal conditions, not to hydraulic cylinder 1 fuel feeding; After only receiving the switching signal that ECU sends, just carry out switching to one of them work gear.
After the lift of hydraulic cylinder 1 is adjusted to the right place, hydraulicdirectional control valve 21 jumps to the meta shelves automatically, not to hydraulic cylinder 1 fuel feeding, two oil pocket pressure of hydraulic cylinder 1 are remained unchanged, piston rod can't move, also just fix the cylinder cap combined location, made it can in the mixed steam combustion process, not take place play up and down, played spacing effect.
Embodiment seven: the example that adopts platform system ECU (Electrical Control Unit) 26 (ECU).
Establish platform system ECU (Electrical Control Unit) 26 on the test-bed, i.e. ECU among Fig. 1.
The lift of hydraulic pump 1 is controlled by platform system ECU (Electrical Control Unit) 26 (ECU).The platform system ECU (Electrical Control Unit) 26 (ECU) of test usefulness, its inner parameter is to make amendment at any time according to the operating mode needs.In process of the test, platform system ECU (Electrical Control Unit) 26 (ECU) is determined the duty of engine this moment according to the feedback data of various sensors.Platform system ECU (Electrical Control Unit) 26 (ECU) is determined the great ratio of compression of this use of engine according to the duty of engine, controls the lift of hydraulic cylinder 1 then by hydraulic servo motor 20, hydraulicdirectional control valve 21, changes ratio of compression.
Embodiment eight: the HYDRAULIC CONTROL SYSTEM mode.
Platform system ECU (Electrical Control Unit) 26 (ECU) is connected with hydraulic servo motor 20 with described hydraulicdirectional control valve 21 respectively by signal line, sends operating instruction to hydraulicdirectional control valve 21 and hydraulic servo motor 20 respectively.
The parameter that ECU transmits according to each sensor, the duty of analysis and judgement engine, whether decision needs to change ratio of compression or other execution parameter; Change ratio of compression if desired, ECU sends switching signal for hydraulic pressure servomotor 20 and hydraulicdirectional control valve 21 so, gives hydraulic pump 25 fuel feeding, and the flow of fuel feeding is by 20 controls of hydraulic servo motor, make hydraulic cylinder 1 promote cylinder cap and rise or descend, to reach the purpose that changes ratio of compression.
Embodiment nine: the collection of hydraulic system input pressure signal.
On described in-line 23, establish hydraulic system pressure sensor 19, and be connected with described platform system ECU (Electrical Control Unit) 26 (ECU) respectively, transmit the output oil pressure signal of hydraulic pump 25 to platform system ECU (Electrical Control Unit) 26 (ECU) by signal line.
The sensor model number of hydraulic system pressure sensor 19 can be KYB18Go4V﹠amp; 6V series, range are determined as required.
Embodiment ten: the collection of air cylinder signal.
Establish air inlet pressure sensor 13, in-cylinder pressure sensor 14 and temperature sensor 15 on the cylinder head assembly 10, the sensor is connected with described platform system ECU (Electrical Control Unit) 26 (ECU) by signal line respectively, transmits the signal of respective physical amount to platform system ECU (Electrical Control Unit) 26 (ECU).
The sensor model number of air inlet pressure sensor 13 and in-cylinder pressure sensor 14 is KYB18Go4V﹠amp; 6V series, range are determined as required.Temperature sensor 15 (comprising intake air temperature, coolant temperature, cylinder cap and center housing temperature etc.), model is WZP-XXX (XXX is a maximum range), range is determined as required.
Embodiment 11: the collection of upper and lower back up pad relative position signal.
Between described upper backup pad 9 and lower supporting plate 7, if guidepost 8, on lower supporting plate 7, establish the guide pin bushing 27 that matches with described guidepost 8, and form with guidepost 8 and to be slidingly matched, on described guide pin bushing 27, establish stand state sensor 16, stand state sensor 17, and be connected with described platform system ECU (Electrical Control Unit) 26 (ECU) by signal line, transmit the big or small signal of distance between upper backup pad 9 and the lower supporting plate 7 to platform system ECU (Electrical Control Unit) 26 (ECU).
Stand state sensor 16 and stand state sensor 17, promptly the residing work compression ratio state of perception stand mainly is the cylinder cap position transducer, use be grating sensor, model can be PP2009/3; Be the lift that is used for determining hydraulic cylinder 1, just determine the ratio of compression of engine.
In the bottom of guidepost 8,, prevent that motion amplitude is excessive and skid off from lower supporting plate 7 with stop nut 4 lockings.
Embodiment 12: the collection of engine rotational speed signal.
On described bent axle 6, establish speed probe 18, and be connected with described platform system ECU (Electrical Control Unit) 26 (ECU), transmit the tach signal of engine crankshaft 6 to platform system ECU (Electrical Control Unit) 26 (ECU) by signal line.
Embodiment 13:
The test method that threst stand adopted of above-mentioned variable compression ratio is as follows:
Be installed in each sensor on the described test-bed, give platform system ECU (Electrical Control Unit) 26 (ECU) the real-time working feedback of status of engine;
The duty that ECU comes the analysis and judgement engine according to these parameters, whether decision needs to change ratio of compression or other execution parameter;
Change ratio of compression if desired, ECU sends switching signal for hydraulic pressure servomotor 20 and hydraulicdirectional control valve 21 so, gives hydraulic cylinder 1 fuel feeding, makes hydraulic cylinder 1 promote cylinder head and rises or descend, so that the cylinder ratio of compression changes;
Adjust the lift of the hydraulic cylinder 1 on the test-bed, make it to adjust to the proper compression ratio, burning can stably be carried out;
If do not need to change ratio of compression, hydraulicdirectional control valve 21 is in meta automatically so, hydraulicdirectional control valve 21 lockings, and the piston rod locking of hydraulic cylinder 1, the cylinder position stability is constant;
Change the duty of engine by fuel injector, EGR valve, obtain the engine operating parameter under the different conditions.
In conjunction with the accompanying drawings the present invention has been carried out exemplary description above; obviously specific implementation of the present invention is not subjected to the restriction of aforesaid way; as long as adopted the improvement of the various unsubstantialities that method of the present invention design and technical scheme carry out; or design of the present invention and technical scheme are directly applied to other occasion without improving, all within protection scope of the present invention.
Claims (10)
1. the threst stand of a variable compression ratio, the performance test that is used for engine, described engine comprises cylinder block (11), piston (12), connecting rod (5) and bent axle (6), parallel with two the respectively back up pad in the two ends of described cylinder block (11) connects, it is characterized in that: in described test-bed, establish Hydraulic Power Transmission System, between the back up pad at described cylinder block (11) two ends, connect by the hydraulic cylinder in the described Hydraulic Power Transmission System (1), promptly a back up pad is connected with hydraulic cylinder, another is connected with hydraulic cylinder piston rod, and one of them back up pad and described test-bed are fixed.
2. according to the threst stand of the described variable compression ratio of claim 1, it is characterized in that: described two back up pads are horizontally disposed with, wherein one is lower supporting plate (7), be fixed on the test-bed, described cylinder block (11) is connected with lower supporting plate (7) by cylinder block support set (2), cylinder block (11) is fixedlyed connected with cylinder block support set (2), between described cylinder block support set (2) and the lower supporting plate (7) for being in axial sliding connection, fixedly connected with upper backup pad (9) in the upper end of described cylinder block (11), the stationkeeping of described bent axle (6) axis on test-bed, and be to be connected with piston (12) by described connecting rod (5) in the below of lower supporting plate (7).
3. according to the threst stand of the described variable compression ratio of claim 2, it is characterized in that: the upper end of described cylinder block (11) and upper backup pad (9) syndeton are: establish cylinder head assembly (10), and fixedly connected with cylinder block (11), upper backup pad (9) respectively.
4. according to the threst stand of claim 1 or 2 or 3 described variable compression ratios, it is characterized in that: described Hydraulic Power Transmission System also is provided with hydraulic pump (25), hydraulicdirectional control valve (21), in-line (23), oil return line (24) and hydraulic oil pipe (3), and described hydraulic pump (25) communicates with two oil pockets of described hydraulic cylinder (1) respectively by in-line (23), hydraulicdirectional control valve (21) and hydraulic oil pipe (3).
5. according to the threst stand of the described variable compression ratio of claim 4, it is characterized in that: described hydraulic pump (25) is driven by hydraulic servo motor (20); Described hydraulicdirectional control valve (21) is the reversal valve by Electromagnetic Drive.
6. according to the threst stand of the described variable compression ratio of claim 5, it is characterized in that: establish platform system ECU (Electrical Control Unit) (26) on the described test-bed, and be connected with hydraulic servo motor (20) with described hydraulicdirectional control valve (21) respectively by signal line, send operating instruction to hydraulicdirectional control valve (21) and hydraulic servo motor (20) respectively; On described in-line (23), establish hydraulic system pressure sensor (19), and be connected with described platform system ECU (Electrical Control Unit) (26) respectively, transmit the output oil pressure signal of hydraulic pump (25) to platform system ECU (Electrical Control Unit) (26) by signal line.
7. according to the threst stand of the described variable compression ratio of claim 3, it is characterized in that: establish platform system ECU (Electrical Control Unit) (26) on the described test-bed, establish air inlet pressure sensor (13), in-cylinder pressure sensor (14) and temperature sensor (15) on the described cylinder head assembly (10), the sensor is connected with described platform system ECU (Electrical Control Unit) (26) by signal line respectively, transmits the signal of respective physical amount to platform system ECU (Electrical Control Unit) (26).
8. according to the threst stand of claim 2 or 3 described variable compression ratios, it is characterized in that: establish platform system ECU (Electrical Control Unit) (26) on the described test-bed, between described upper backup pad (9) and lower supporting plate (7), if guidepost (8), on lower supporting plate (7), establish the guide pin bushing (27) that matches with described guidepost (8), and form with guidepost (8) and to be slidingly matched, on described guide pin bushing (27), establish stand state sensor (16,17), and be connected with described platform system ECU (Electrical Control Unit) (26) by signal line respectively, transmit the signal of the distance size between upper backup pad (9) and the lower supporting plate (7) to platform system ECU (Electrical Control Unit) (26).
9. according to the threst stand of claim 2 or 3 described variable compression ratios, it is characterized in that: establish platform system ECU (Electrical Control Unit) (26) on the described test-bed, on described bent axle (6), establish speed probe (18), and be connected with described platform system ECU (Electrical Control Unit) (26) by signal line, transmit the tach signal of engine crankshaft (6) to platform system ECU (Electrical Control Unit) (26).
10. according to the test method that threst stand adopted of the described variable compression ratio of claim 7, it is characterized in that:
Be installed in each sensor on the described test-bed, give platform system ECU (Electrical Control Unit) (26) the real-time working feedback of status of engine;
The duty that platform system ECU (Electrical Control Unit) (26) is come the analysis and judgement engine according to the parameter of each sensor feedback, whether decision needs to change ratio of compression or other execution parameter;
Change ratio of compression if desired, platform system ECU (Electrical Control Unit) (26) sends switching signal for hydraulic pressure servomotor (20) and hydraulicdirectional control valve (21) so, give hydraulic cylinder (1) fuel feeding, make hydraulic cylinder (1) promote cylinder head and rise or descend, the cylinder ratio of compression is changed;
Adjust the lift of the hydraulic cylinder (1) on the test-bed, make it to adjust to the proper compression ratio, burning can stably be carried out;
If do not need to change ratio of compression, hydraulicdirectional control valve (21) is in meta automatically so, hydraulicdirectional control valve (21) locking, and the piston rod locking of hydraulic cylinder (1), the cylinder position stability is constant;
Change the duty of engine by fuel injector, EGR valve, obtain the engine operating parameter under the different conditions.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008100248406A CN101368875B (en) | 2008-05-07 | 2008-05-07 | Testing bench frame and method for engine with variable compression ratio |
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| CN2008100248406A CN101368875B (en) | 2008-05-07 | 2008-05-07 | Testing bench frame and method for engine with variable compression ratio |
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| CN101368875A CN101368875A (en) | 2009-02-18 |
| CN101368875B true CN101368875B (en) | 2010-04-14 |
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| CN101514941B (en) * | 2009-04-03 | 2010-12-08 | 北京工业大学 | Fast compressing expansion machine in process of studying combustion process of engine |
| CN102221466B (en) * | 2011-04-01 | 2015-10-14 | 西门子大型特种电机（山西）有限公司 | Inclination mounted motor test top power apparatus |
| CN102866015A (en) * | 2012-09-24 | 2013-01-09 | 无锡莱吉特信息科技有限公司 | Engine pedestal testing system based on MEMS (micro-electromechanical system) technology |
| CN103116010B (en) * | 2013-01-27 | 2014-11-12 | 浙江大学 | Compression and combustion testing device of mixed gas |
| CN104833516A (en) * | 2015-05-20 | 2015-08-12 | 奇瑞汽车股份有限公司 | Test stand for testing influences imposed on frictional work of engine by crankshaft eccentricity |
| CN105136464B (en) * | 2015-09-08 | 2017-08-29 | 西华大学 | A kind of engine crankshaft connecting rod simulation mechanism |
| CN105855606A (en) * | 2016-05-10 | 2016-08-17 | 朱德仲 | Milling machine conversion device |
| CN107781056B (en) * | 2017-11-22 | 2024-03-22 | 吉林大学 | Intelligent piston |
| CN113465929B (en) * | 2021-07-15 | 2022-04-22 | 哈尔滨工程大学 | Internal combustion engine spray combustion performance testing device based on rapid compression expander |
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| CN2867327Y (en) * | 2005-12-29 | 2007-02-07 | 广西玉柴机器股份有限公司 | Cylinder head airway test platform |
| CN101013064A (en) * | 2007-02-13 | 2007-08-08 | 沪东重机股份有限公司 | Diesel engine fuel consumption measuring apparatus |
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| WO2006045975A1 (en) * | 2004-10-27 | 2006-05-04 | Renault S.A.S | Method and device for estimating the temperature of exhaust gases entering into a post-treatment system arranged downstream from a system for the treatment of said gases |
| CN2867327Y (en) * | 2005-12-29 | 2007-02-07 | 广西玉柴机器股份有限公司 | Cylinder head airway test platform |
| CN101013064A (en) * | 2007-02-13 | 2007-08-08 | 沪东重机股份有限公司 | Diesel engine fuel consumption measuring apparatus |
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