CN104568456A - Method and system for testing traction of limited slip differential - Google Patents
Method and system for testing traction of limited slip differential Download PDFInfo
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- CN104568456A CN104568456A CN201310470501.1A CN201310470501A CN104568456A CN 104568456 A CN104568456 A CN 104568456A CN 201310470501 A CN201310470501 A CN 201310470501A CN 104568456 A CN104568456 A CN 104568456A
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Abstract
The invention discloses a method and a system for testing traction of a limited slip differential. The method comprises the following steps: putting at least one drive wheel of a vehicle provided with a to-be-tested limited slip differential on a simulative sliding table; horizontally connecting the vehicle with a pull measurement device by using a connecting device; recording the pull measured by the pull measurement device when the vehicle in different gears and/or under different rotating speeds of an engine just obtains a driving force to move forward; comparing the measured pull and the required traction Fxi, wherein when each pull measured in different gears and/or under different rotating speeds of the engine is greater than or equal to the required traction Fxi, the condition that the tested limited slip differential meets the requirement can be determined. The method and device for testing traction of the limited slip differential disclosed by the invention are very high in testing accuracy and low in testing cost and no real test scenes are needed to be erected, so that the research and development cycle of the limited slip differential can be greatly shortened.
Description
Technical field
The present invention relates to field tests, particularly, relating to a kind of method and system of the tractive force for testing limited-slip differential.
Background technology
Differential mechanism solve well automobile at uneven road surface and turn to time driving wheels rotating speed different requirement; But the existence that the thing followed is differential mechanism makes automobile power when a side drive wheel is skidded effectively to transmit, and the wheel namely skidded can not produce driving force, and non-slip wheel does not obtain enough moments of torsion.For example take turns when vehicle one and fall in hole, hole, this wheel just has no any friction force and can say, the wheel that lands relatively but has great resistance, and the now effect of differential mechanism can allow all dynamic feedbacks to the wheel of low friction.The wheel falling into hole, hole can not move in stall, and landing wheel complete attonity on the contrary, vehicle like this just cannot travel.In order to address this problem, each automobile vendor have developed various limited-slip differential, can operationally make left and right wheels together operate, and controls within limits, the speed discrepancy of left and right wheels to ensure that vehicle is advanced normally.
Vehicle travels when skidding whether can have enough tractive force to get rid of poverty the topmost performance embodying limited-slip differential when getting down hopeless in a quagmire or in ice face.According to prior art, the tractive force test for limited-slip differential needs analog-driven to take turns single-wheel skidding, namely needs to make vehicle single driven wheel to be tested enter mud pit or ice face.But this method of testing except cost high, beyond somewhat expensive, also higher to the requirement of weather and environment, therefore the construction cycle is relatively long.The domestic method not yet having associated verification limited-slip differential tractive force at present.
Summary of the invention
The object of the present invention is to provide a kind of method and system of the tractive force for testing limited-slip differential, the domestic problem not yet having the method for associated verification limited-slip differential tractive force at present can be solved.
According to an aspect of the present invention, provide a kind of method of the tractive force for testing limited-slip differential, the method comprises: be placed on by least one driving wheel being provided with the vehicle of limited-slip differential to be tested above simulation slide unit; By coupling arrangement, described vehicle is flatly connected with tension measuring device; Pulling force when being recorded in different gear and/or engine described vehicle just obtains driving force and advances under different rotating speeds, described tension measuring device recorded; And by the described pulling force that records compared with required tractive force Fxi, wherein when each described pulling force recorded under different rotating speeds at different gear and/or engine is all more than or equal to required tractive force Fxi, can determine that tested limited-slip differential meets the demands.
According to the preferred embodiment of the present invention, described vehicle can be two to drive or four-wheel drive cars.
According to the preferred embodiment of the present invention, described pulling force can be measured under 1 grade and 2 grades.
According to the preferred embodiment of the present invention, can in engine speed to measuring described pulling force when 1000pr/min, 1500pr/min and 2500pr/min.
According to the preferred embodiment of the present invention, can pulling force described in repetitive measurement in the same circumstances, and by the mean value of value of thrust that repeatedly records compared with required tractive force Fxi.
According to the preferred embodiment of the present invention, when the road-adhesion coefficient of described simulation slide unit is
time, described required tractive force Fxi can meet formula:
wherein, m is the complete vehicle quality of described vehicle, and g is acceleration of gravity and α is current hill grade.
According to the preferred embodiment of the present invention, one end of described coupling arrangement can be fixed on the rear wheel drive bridge of described vehicle.
According to a further aspect of the invention, provide a kind of system of the tractive force for testing limited-slip differential, this system comprises: simulation slide unit, for placing at least one driving wheel of the vehicle being provided with limited-slip differential to be tested; Tension measuring device, for recording the pulling force of described vehicle when different gear and/or engine just obtain driving force and advance under different rotating speeds; And coupling arrangement, for described vehicle is flatly connected with described tension measuring device.
According to the preferred embodiment of the present invention, this system can also comprise test data acquisition device, for obtaining the pulling force that tension measuring device records; Data Comparison device, for the value of thrust that obtained by described test data acquisition device compared with required tractive force Fxi; And result output unit, for exporting and showing test results, wherein when each described pulling force recorded under different rotating speeds at different gear and/or engine is all more than or equal to described required tractive force Fxi, export and show the test result that tested limited-slip differential meets the demands.
According to the preferred embodiment of the present invention, when the road-adhesion coefficient of described simulation slide unit is
time, described required tractive force Fxi can meet formula:
wherein, m is the complete vehicle quality of described vehicle, and g is acceleration of gravity and α is current hill grade.
The method and system of the tractive force for testing limited-slip differential provided by the invention can simulating vehicle when exercising in the wild owing to get down hopeless in a quagmire or at the sight of the next driving wheel idle running of the situations such as ice face skidding, and test car load and to get rid of poverty required tractive force, thus judge whether the limited-slip differential that this vehicle is installed meets the requirements.Use the method and apparatus test accuracy of the tractive force of test limited-slip differential of the present invention very high, and testing cost is low, substantially reduces the R&D cycle of limited-slip differential.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of the method according to the tractive force for testing limited-slip differential provided by the invention;
Fig. 2 is the schematic diagram of the system according to the tractive force for testing limited-slip differential provided by the invention; And
Fig. 3 is the schematic diagram of the partial devices of the system of the tractive force for testing limited-slip differential according to the preferred embodiment of the present invention.
Description of reference numerals
Slide unit simulated by 10 vehicles 20 to be tested
30 pulling force rope 40 tautness meters
50 test data acquisition device 60 Data Comparison devices
70 result output units
Embodiment
Below with reference to the accompanying drawings the present invention is described in detail.
With reference to Fig. 1, the invention provides a kind of method of the tractive force for testing limited-slip differential, the method comprises: in step S21, is placed on by least one driving wheel being provided with the vehicle of limited-slip differential to be tested above simulation slide unit; In step S22, by coupling arrangement, described vehicle is flatly connected with tension measuring device; In step S23, pulling force when being recorded in different gear and/or engine described vehicle just obtains driving force and advances under different rotating speeds, described tension measuring device recorded; In step S24, by the described pulling force that records under different rotating speeds at different gear and/or engine compared with required tractive force Fxi; In step S25, judge that all whether each described pulling force recorded under different rotating speeds at different gear and/or engine is more than or equal to required tractive force Fxi; In step S26, determining that when meeting the Rule of judgment of step S25 tested limited-slip differential meets the demands, in step S27, determining that when not meeting the Rule of judgment of step S25 tested limited-slip differential does not meet the demands.
Preferably, vehicle to be tested can be two to drive or four-wheel drive cars.Such as, when described vehicle be two of rear-guard type to drive time, vehicle trailing wheel is reached the centre of test platform, and by unsettled for another one trailing wheel.When now starting described vehicle, unsettled wheel can dally, thus this system simulation vehicle is got down hopeless in a quagmire in the wild or the state of skidding in ice face.
In a preferred embodiment of the invention, can when 1 grade and 2 grades, respectively in engine speed to measuring described pulling force when 1000pr/min, 1500pr/min and 2500pr/min.
Preferably, can pulling force described in repetitive measurement in the same circumstances, and by the mean value of value of thrust that repeatedly records compared with required tractive force Fxi.
According to the preferred embodiment of the present invention, system of the present invention can also simulating vehicle get down hopeless in a quagmire under certain slope or ice face skid state, can by adjustment simulation slide unit and surface level between angle carry out the state that simulating vehicle is in climbing.When the road-adhesion coefficient of described simulation slide unit is
time, described required tractive force Fxi can meet formula:
wherein, m is the complete vehicle quality of described vehicle, and g is acceleration of gravity and α is current hill grade.
That is, in this case, test process and result be not by the impact of the table top friction force size of simulation slide unit.
Preferably, described tension measuring device can be tautness meter, and described coupling arrangement can be pulling force rope.
Preferably, one end of described coupling arrangement can be fixed on the rear wheel drive bridge of described vehicle.
Alternatively, described required tractive force Fxi can be determined by main engine plants and supplier both sides.
According to a further aspect of the invention, provide a kind of system of the tractive force for testing limited-slip differential, this system comprises: simulation slide unit, for placing at least one driving wheel of the vehicle being provided with limited-slip differential to be tested; Tension measuring device, for recording the pulling force of described vehicle when different gear and/or engine just obtain driving force and advance under different rotating speeds; And coupling arrangement, for described vehicle is flatly connected with described tension measuring device.
Fig. 2 is the illustrative diagram of the system according to the tractive force for testing limited-slip differential of the present invention, in fig. 2, the driving wheel of vehicle 10 to be tested is two trailing wheels, and the left rear wheel of testing vehicle 10 slowly reaches above simulation slide unit 20 by tester, keeps off hind wheel unsettled simultaneously.Next, use pulling force rope 30 to be flatly connected with tautness meter 40 by the rear wheel drive bridge of testing vehicle 10, and tautness meter 40 reading is reset.Next, by artificial or computer recording under 1 grade, the tensile force f 1 when engine speed just obtains driving force to testing vehicle when 1000pr/min 10 and advances, tautness meter 40 recorded, and this process is repeated 2-3 time, obtain the mean value F10 of F1.By identical method, obtain under 1 grade, average tension F20 when engine speed just obtains driving force to vehicle when 1500pr/min and advances, and under 2 grades, average tension F30 when engine speed just obtains driving force to vehicle when 2500pr/min and advances.Finally, F10, F20 and F30 are compared with Fxi respectively, judge that when F10, F20 and F30 are all more than or equal to Fxi tested limited-slip differential meets the demands.
Preferably, as shown in Figure 3, this system can also comprise test data obtain fill 50, for obtaining the pulling force that tension measuring device records; Data Comparison device 60, for the value of thrust that obtained by described test data acquisition device 50 compared with required tractive force Fxi; And result output unit 70, for exporting and showing the test result of tested limited-slip differential, when each described pulling force recorded under different rotating speeds at different gear and/or engine is all more than or equal to described required tractive force Fxi, exports and show the test result that tested limited-slip differential meets the demands.
Such as, with reference to Fig. 3, described test data acquisition device 50 can be connected with tension measuring device (the present embodiment is tautness meter 40), come by using the controller of such as programmable logic controller (PLC) to obtain value of thrust from described tension measuring device, described Data Comparison device 60 is connected with described test data acquisition device 50, for calculate the value of thrust repeatedly recorded under same condition mean value and compared with described required tractive force Fxi, and described result output unit 70 can be the display being positioned at test site or total Control Room, be connected with described Data Comparison device 60, for exporting and showing the test result exported in described Data Comparison device 60.
According to the preferred embodiment of the present invention, when the road-adhesion coefficient of described simulation slide unit is
time, described required tractive force Fxi can meet formula:
wherein, m is the complete vehicle quality of described vehicle, and g is acceleration of gravity and α is current hill grade.
The method and system of the tractive force for testing limited-slip differential that the application of the invention provides, tester can simulating vehicle when exercising in the wild owing to getting down hopeless in a quagmire or the sight of driving wheel idle running under the situations such as ice face skidding, and test car load and to get rid of poverty required tractive force, thus judge whether the limited-slip differential that this vehicle is installed meets the requirements.Because the method and apparatus test accuracy of the tractive force of test limited-slip differential of the present invention is very high, and testing cost is low, do not need to create out of doors vehicle get down hopeless in a quagmire the predicament of skidding or skid in ice face time real scene, greatly can shorten the R&D cycle of limited-slip differential.
Below the preferred embodiment of the present invention is described in detail by reference to the accompanying drawings; but; the present invention is not limited to the detail in above-mentioned embodiment; on the contrary; within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each the concrete technical characteristic described in above-mentioned embodiment, in reconcilable situation, can be combined by any suitable mode.In order to avoid unnecessary repetition, the present invention illustrates no longer separately to various possible array mode.
In addition, also can carry out combination in any between various different embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as full content disclosed in this invention equally.
Claims (10)
1., for testing a method for the tractive force of limited-slip differential, the method comprises:
At least one driving wheel being provided with the vehicle of limited-slip differential to be tested is placed on above simulation slide unit;
By coupling arrangement, described vehicle is flatly connected with tension measuring device;
Pulling force when being recorded in different gear and/or engine described vehicle just obtains driving force and advances under different rotating speeds, described tension measuring device recorded; And
By the described pulling force that records compared with required tractive force Fxi, wherein when each described pulling force recorded under different rotating speeds at different gear and/or engine is all more than or equal to required tractive force Fxi, determine that tested limited-slip differential meets the demands.
2. method according to claim 1, wherein, described vehicle two to drive or four-wheel drive cars.
3. method according to claim 1, is characterized in that, under 1 grade and 2 grades, measure described pulling force.
4. method according to claim 1, is characterized in that, in engine speed to measuring described pulling force when 1000pr/min, 1500pr/min and 2500pr/min.
5. method according to claim 1, is characterized in that, in the same circumstances pulling force described in repetitive measurement, and by the mean value of value of thrust that repeatedly records compared with required tractive force Fxi.
6. method according to claim 1, wherein, when the road-adhesion coefficient of described simulation slide unit is
time, described required tractive force Fxi meets formula:
wherein, m is the complete vehicle quality of described vehicle, and g is acceleration of gravity and α is current hill grade.
7. method according to claim 1, wherein, is fixed on one end of described coupling arrangement on the rear wheel drive bridge of described vehicle.
8., for testing a system for the tractive force of limited-slip differential, this system comprises:
Simulation slide unit, for placing at least one driving wheel of the vehicle being provided with limited-slip differential to be tested;
Tension measuring device, for recording the pulling force of described vehicle when different gear and/or engine just obtain driving force and advance under different rotating speeds; And
Coupling arrangement, for being flatly connected described vehicle with described tension measuring device.
9. system according to claim 8, wherein this system also comprises:
Test data acquisition device, for obtaining the pulling force that tension measuring device records;
Data Comparison device, for the value of thrust that obtained by described test data acquisition device compared with required tractive force Fxi; And
Result output unit, for exporting and showing test results, wherein when each described pulling force recorded under different rotating speeds at different gear and/or engine is all more than or equal to described required tractive force Fxi, export and show the test result that tested limited-slip differential meets the demands.
10. system according to claim 9, wherein, when the road-adhesion coefficient of described simulation slide unit is
time, described required tractive force Fxi meets formula:
wherein, m is the complete vehicle quality of described vehicle, and g is acceleration of gravity and α is current hill grade.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310470501.1A CN104568456A (en) | 2013-10-10 | 2013-10-10 | Method and system for testing traction of limited slip differential |
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| CN201310470501.1A CN104568456A (en) | 2013-10-10 | 2013-10-10 | Method and system for testing traction of limited slip differential |
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| CN201310470501.1A Pending CN104568456A (en) | 2013-10-10 | 2013-10-10 | Method and system for testing traction of limited slip differential |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105300584A (en) * | 2015-09-18 | 2016-02-03 | 北汽福田汽车股份有限公司 | Test system for testing impact force on tractor saddle |
| CN107957338A (en) * | 2017-12-21 | 2018-04-24 | 哈尔滨东安汽车发动机制造有限公司 | A kind of test method, measuring device and the measuring method of vehicle rotary drum differential mechanism performance |
| CN114739554A (en) * | 2022-04-02 | 2022-07-12 | 中国第一汽车股份有限公司 | Test experiment method and evaluation method for torsional strength of four-wheel drive transmission system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105300584A (en) * | 2015-09-18 | 2016-02-03 | 北汽福田汽车股份有限公司 | Test system for testing impact force on tractor saddle |
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| CN107957338A (en) * | 2017-12-21 | 2018-04-24 | 哈尔滨东安汽车发动机制造有限公司 | A kind of test method, measuring device and the measuring method of vehicle rotary drum differential mechanism performance |
| CN114739554A (en) * | 2022-04-02 | 2022-07-12 | 中国第一汽车股份有限公司 | Test experiment method and evaluation method for torsional strength of four-wheel drive transmission system |
| CN114739554B (en) * | 2022-04-02 | 2024-02-02 | 中国第一汽车股份有限公司 | Test experiment method and evaluation method for torsional strength of four-wheel drive train |
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