CN113221249B - Decoupling method for multi-connecting-rod rear suspension rod system - Google Patents
Decoupling method for multi-connecting-rod rear suspension rod system Download PDFInfo
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- CN113221249B CN113221249B CN202110561019.3A CN202110561019A CN113221249B CN 113221249 B CN113221249 B CN 113221249B CN 202110561019 A CN202110561019 A CN 202110561019A CN 113221249 B CN113221249 B CN 113221249B
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- G06—COMPUTING; CALCULATING OR COUNTING
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- G06F30/10—Geometric CAD
- G06F30/15—Vehicle, aircraft or watercraft design
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
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Abstract
The invention discloses a decoupling method for a multi-connecting-rod rear suspension rod system, which is characterized in that four-wheel positioning parameter points are confirmed based on the suspension rod system; establishing a motion model based on a suspension hard point and a four-wheel positioning parameter point, and after applying a constraint to the four-wheel positioning parameter point based on the motion model, simulating to obtain a four-wheel positioning toe-in parameter change curve and a four-wheel positioning camber parameter change curve caused by the motion of a single four-wheel positioning parameter point; acquiring a four-wheel positioning camber angle change range and a four-wheel positioning toe angle change range based on the four-wheel positioning toe parameter change curve and the four-wheel positioning camber parameter change curve; and if and only if the four-wheel positioning camber angle change range and the four-wheel positioning toe-in angle change range of the four-wheel positioning parameter point meet the following principle, the four-wheel positioning parameter point can be adjusted. The invention is used for analyzing the coupling phenomenon among the multiple connecting rods and decoupling the rod system, and reasonably selects the rod system to carry out four-wheel positioning adjustment, thereby ensuring that the rod system can be quickly adjusted to a target range.
Description
Technical Field
The invention discloses a decoupling method for a suspension rod system, belongs to the technical field of rear suspensions, and particularly discloses a decoupling method for a multi-connecting-rod rear suspension rod system.
Background
With the progress of science and technology, the upgrading of consumption and the improvement of the performance level of the whole vehicle, the multi-connecting-rod vehicle type is applied more and more. Suspension systems have more and more degrees of freedom and greater design difficulty, and great challenges are presented to production manufacturing and after-sales repair. Good multi-link suspension designs generally have the following characteristics: the operation stability and comfort and the NVH performance are good; the manufacture and the assembly are convenient; the maintenance and the use are convenient. The operation stability and comfort and the NVH performance can be optimized through early design or later adjustment, the manufacturing and maintenance convenience is mainly embodied in the aspect of four-wheel positioning adjustment, and once the early design is unreasonable, the later change is very high in cost. Therefore, the rod system needs to be decoupled in the early design process, if the arrangement of the rod system is unreasonable or the selection of four-wheel positioning adjustment is unreasonable, the rod system coupling phenomenon exists, so that the problems that the four-wheel positioning cannot be adjusted or cannot be quickly adjusted to the design range and the like exist, and great inconvenience is brought to production, manufacturing and after-sale maintenance.
The specification of Chinese invention patent CN107832554A discloses a Macpherson suspension four-wheel parameter checking method based on a CATIA parameterized module, which is used for building a Macpherson suspension part architecture model based on a CATIA platform and setting parameter variables and relation variables; modifying parameter variables according to actual conditions, and matching states to be simulated; after the parameter variables of each different state are set, the system can simulate four-wheel parameter results corresponding to the state in time through a relational formula, namely the relational variables, and display specific difference values of the results and the initially set four-wheel parameter values; the invention can be suitable for different vehicle types only by modifying parameters according to actual conditions; the variable parameter setting covers all key factors influencing the four-wheel parameters of the Macpherson structure suspension, and has strong universality; design, production departments or suppliers may also be instructed to modify certain dimensions to meet the preset four-wheel parameter values; however, the method can only analyze whether the hard point arrangement meets the suspension K & C performance, and cannot analyze the coupling condition between the multi-link rod systems, and if the coupling phenomenon exists between the multi-link rod systems, the four wheels cannot be adjusted to the target range or can be adjusted to the target range only by adjusting for a long time, which brings great loss to production.
The specification of the chinese invention patent CN107247830B discloses an optimization method for K & C characteristic tolerance of an automobile suspension, which comprises the following steps: establishing a chassis dynamic model according to each coordinate value in the hard point table, and establishing a first incidence relation between the suspension hard point tolerance and the suspension K & C characteristic tolerance; analyzing the tolerance of the coordinate value of the key hard point, and establishing a second incidence relation between the tolerance of the hard point of the suspension and the tolerance of the part; according to the first incidence relation and the second incidence relation, obtaining a third incidence relation between the suspension K & C characteristic tolerance and the part tolerance, and obtaining an influence quantity representing the influence of each part tolerance on the suspension K & C characteristic tolerance; when the accumulated tolerance of the characteristic tolerance of the suspension K & C exceeds the preset tolerance range threshold, the design change of the structure or the tolerance of the parts with the influence quantity in the front is prompted, so that the final accumulated tolerance is within the preset tolerance range threshold.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a decoupling method for a multi-connecting-rod rear suspension rod system, which is used for analyzing the coupling phenomenon among multiple connecting rods and decoupling the rod system, reasonably selecting the rod system to carry out four-wheel positioning adjustment and ensuring that the rod system can be quickly adjusted to a target range.
The invention discloses a decoupling method of a multi-connecting-rod rear suspension rod system, which is used for confirming four-wheel positioning parameter points based on a suspension rod system; establishing a motion model based on a suspension hard point and a four-wheel positioning parameter point, and after applying constraints to the four-wheel positioning parameter point based on the motion model, simulating to obtain a four-wheel positioning toe-in parameter change curve and a four-wheel positioning camber parameter change curve caused by the motion of a single four-wheel positioning parameter point; acquiring a four-wheel positioning camber angle change range and a four-wheel positioning toe angle change range based on the four-wheel positioning toe parameter change curve and the four-wheel positioning camber parameter change curve; if and only if the four-wheel positioning camber angle variation range and the four-wheel positioning toe-in angle variation range of the four-wheel positioning parameter point satisfy the following principle, the four-wheel positioning parameter point can be adjusted, and the principle 1: when a four-wheel positioning parameter point changes, only the variation of the four-wheel positioning toe-in parameter is influenced, the variation of the four-wheel positioning camber parameter is less than or equal to +/-8 ', or only the variation of the four-wheel positioning camber parameter is influenced, and the variation of the four-wheel positioning toe-in parameter is less than or equal to +/-8'; principle 2: when a coupling phenomenon exists between one four-wheel positioning parameter point and the other four-wheel positioning parameter point, the four-wheel positioning toe-in parameter change interval of the four-wheel positioning parameter point which does not meet the principle 1 is positioned in the four-wheel positioning toe-in parameter change interval of the four-wheel positioning parameter point which meets the principle 1, and the four-wheel positioning camber parameter change interval of the four-wheel positioning parameter point which does not meet the principle 1 is positioned in the four-wheel positioning camber parameter change interval of the four-wheel positioning parameter point which meets the principle 1.
In a preferred embodiment of the invention, the hinge point between any two suspension links in the suspension linkage is a four wheel alignment parameter point.
In a preferred embodiment of the present invention, in the DMU module of the cata software, the construction of the model of the motion of the west safety is based on the suspension hard points and the four wheel alignment parameter points.
In a preferred embodiment of the present invention, the method for applying constraints to four-wheel positioning parameter points based on a motion model comprises: and applying direction constraint and distance constraint to each four-wheel positioning parameter point.
In a preferred embodiment of the present invention, the direction constraint comprises an X-axis constraint or a Y-axis constraint or a Z-axis constraint, and the four-wheel positioning parameter point has and only has one freedom of movement along the constraint direction after the direction constraint is applied.
In a preferred embodiment of the invention, the distance constraint comprises a movement distance that constrains the movement in the direction, -5mm ≦ movement distance ≦ +5 mm.
In a preferred embodiment of the present invention, an X-axis of the four-wheel alignment toe parameter variation curve is a movement distance of the four-wheel alignment parameter point along the constraint direction, and a Y-axis of the four-wheel alignment toe parameter variation curve is an inclination angle of a plane in which the four wheels are located with respect to a horizontal plane.
In a preferred embodiment of the present invention, the X-axis of the four-wheel alignment camber parameter variation curve is a movement distance of the four-wheel alignment camber parameter point along the constraint direction, and the Y-axis of the four-wheel alignment camber parameter variation curve is an inclination angle of a plane in which the four wheels are located with respect to a horizontal plane.
In a preferred embodiment of the invention, the analysis is re-modeled by adjusting the hard spot position when principle 1 is not satisfied.
In a preferred embodiment of the invention, when principle 1 is not satisfied, a different imposed constraint solution is replaced for analysis again.
In a preferred embodiment of the invention, the four-wheel positioning parameter points which can be adjusted and the constraint applying scheme corresponding to the four-wheel positioning parameter points are output.
The invention has the beneficial effects that: the decoupling method for the multi-connecting-rod rear suspension rod system disclosed by the invention can quickly and efficiently analyze the coupling phenomenon among the multi-connecting rods and decouple the rod system, and reasonably select the rod system to carry out four-wheel positioning adjustment, thereby ensuring that the multi-connecting-rod rear suspension rod system can be quickly adjusted to a target range.
Drawings
FIG. 1 is a flow chart of a multi-link rear suspension linkage decoupling method of the present invention;
FIG. 2 is a schematic diagram of four-wheel alignment parameter point positions of a certain vehicle type according to the multi-link rear suspension linkage decoupling method of the present invention;
FIG. 3 is a schematic diagram of a four-wheel alignment camber parameter variation curve of a first four-wheel alignment parameter point of the multi-link rear suspension architecture decoupling method of the present invention;
FIG. 4 is a schematic diagram of a four-wheel alignment toe-in parameter variation curve of a first four-wheel alignment parameter point of the multi-link rear suspension decoupling method of the present invention;
FIG. 5 is a schematic diagram of a four-wheel alignment camber parameter variation curve of a second four-wheel alignment parameter point of the multi-link rear suspension architecture decoupling method of the present invention;
FIG. 6 is a schematic diagram of a variation curve of a toe-in parameter for four-wheel alignment at a second four-wheel alignment parameter point of the multi-link rear suspension decoupling method of the present invention;
FIG. 7 is a schematic diagram of a four-wheel alignment camber parameter change curve at a third four-wheel alignment parameter point of the multi-link rear suspension linkage decoupling method of the present invention;
FIG. 8 is a schematic diagram of a four-wheel alignment toe-in parameter variation curve at a third four-wheel alignment parameter point of the multi-link rear suspension linkage decoupling method of the present invention;
FIG. 9 is a flow chart of a decoupling analysis of a multi-link rear suspension architecture decoupling method of the present invention;
in the figure: 1-a first four-wheel positioning parameter point, 2-a second four-wheel positioning parameter point and 3-a third four-wheel positioning parameter point.
Detailed Description
The technical solutions (including the preferred technical solutions) of the present invention are further described in detail by the figures and by way of listing some optional embodiments of the present invention. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
The invention discloses a decoupling method for a multi-connecting-rod rear suspension rod system, which is characterized in that four-wheel positioning parameter points are confirmed based on the suspension rod system; establishing a motion model based on a suspension hard point and a four-wheel positioning parameter point, and after applying a constraint to the four-wheel positioning parameter point based on the motion model, simulating to obtain a four-wheel positioning toe-in parameter change curve and a four-wheel positioning camber parameter change curve caused by the motion of a single four-wheel positioning parameter point; acquiring a four-wheel positioning camber angle change range and a four-wheel positioning toe angle change range based on the four-wheel positioning toe parameter change curve and the four-wheel positioning camber parameter change curve; if and only if the four-wheel positioning camber angle variation range and the four-wheel positioning toe-in angle variation range of the four-wheel positioning parameter point satisfy the following principle, the four-wheel positioning parameter point can be adjusted, and the principle 1: when a four-wheel positioning parameter point changes, only the variation of the four-wheel positioning toe-in parameter is influenced, the variation of the four-wheel positioning camber parameter is less than or equal to +/-8 ', or only the variation of the four-wheel positioning camber parameter is influenced, and the variation of the four-wheel positioning toe-in parameter is less than or equal to +/-8'; principle 2: when a coupling phenomenon exists between one four-wheel positioning parameter point and the other four-wheel positioning parameter point, the four-wheel positioning toe-in parameter change interval of the four-wheel positioning parameter point which does not meet the principle 1 is positioned in the four-wheel positioning toe-in parameter change interval of the four-wheel positioning parameter point which meets the principle 1, and the four-wheel positioning camber parameter change interval of the four-wheel positioning parameter point which does not meet the principle 1 is positioned in the four-wheel positioning camber parameter change interval of the four-wheel positioning parameter point which meets the principle 1.
In a preferred embodiment of the invention, the hinge point between any two suspension links in the suspension linkage is a four-wheel alignment parameter point.
In a preferred embodiment of the present invention, in the DMU module of the cata software, the construction of the motion model based on the suspension hard points and the four-wheel location parameter points is based on the west ann.
In a preferred embodiment of the present invention, the method for applying constraints to four-wheel positioning parameter points based on a motion model comprises: and applying direction constraint and distance constraint to each four-wheel positioning parameter point.
In a preferred embodiment of the present invention, the direction constraint comprises an X-axis constraint or a Y-axis constraint or a Z-axis constraint, and the four-wheel positioning parameter point has and only has one freedom of movement along the constraint direction after the direction constraint is applied.
In a preferred embodiment of the invention, the distance constraint comprises a movement distance that constrains the movement in the direction, -5mm ≦ movement distance ≦ +5 mm.
In a preferred embodiment of the present invention, an X-axis of the four-wheel alignment toe parameter variation curve is a movement distance of the four-wheel alignment parameter point along the constraint direction, and a Y-axis of the four-wheel alignment toe parameter variation curve is an inclination angle of a plane in which the four wheels are located with respect to a horizontal plane.
In a preferred embodiment of the present invention, the X-axis of the four-wheel alignment camber parameter variation curve is a movement distance of the four-wheel alignment camber parameter point along the constraint direction, and the Y-axis of the four-wheel alignment camber parameter variation curve is an inclination angle of a plane in which the four wheels are located with respect to a horizontal plane.
In a preferred embodiment of the invention, the analysis is re-modeled by adjusting the hard spot position when principle 1 is not satisfied.
In a preferred embodiment of the invention, when principle 1 is not satisfied, a different imposed constraint solution is replaced for analysis again.
In a preferred embodiment of the invention, an adjustable four-wheel positioning parameter point and a constraint applying scheme corresponding to the four-wheel positioning parameter point are output.
Specifically, the steps for analyzing the multi-link rear suspension rod system of a certain vehicle type based on the invention are as follows:
firstly, confirming that a multi-link mounting point 1, a multi-link mounting point 2 and a multi-link mounting point 3 are used as four-wheel positioning parameter adjusting points under the common condition based on a suspension structure and hard points;
secondly, establishing a local motion model by using a cata software DMU module based on the hard points and the four-wheel positioning adjustment points, and setting adjustment quantity, wherein the general adjustment quantity is set to be +/-5 mm;
thirdly, acquiring a four-wheel positioning toe-in parameter change curve and a four-wheel positioning camber parameter change curve of each four-wheel positioning parameter point;
fourthly, based on the basic principle of linkage decoupling:
1. when four-wheel positioning adjustment is carried out, only one parameter is influenced by adjusting one position, and the influence on the other parameter is small (the change is ≦ 8');
2. even if a coupling phenomenon exists at one point, the coupling phenomenon must be within the adjustment range of another point;
the analysis of each curve in the third step shows that the toe-in change is about +/-3' when the point 1 is adjusted, the camber change range is about +/-1.3 degrees, the range is wide, and the method is suitable for adjusting camber and meets the decoupling judgment principle 1;
when the point 2 is adjusted, the toe-in change is +/-1.7 degrees, the camber change range is-0.4-1.8 degrees, the camber exceeds the adjustment range of the point 1, and the decoupling judgment principle 2 is not satisfied;
when the point 3 is adjusted, the toe-in change is +/-1.72 degrees, the camber change range is 0-1 degree, and the camber meets the decoupling judgment principle 2 within the adjustment range of the point 1;
if the point 2 and the point 3 are matched to adjust four-wheel positioning, toe-in and camber change ranges are large and overlapped, the decoupling judgment principle 1 is not met, and decoupling cannot be performed.
It should be understood that the above-mentioned embodiments are merely preferred examples of the present invention, and the present invention is not limited thereto, and any modifications, combinations, substitutions, improvements, etc. made within the spirit and scope of the present invention are included in the present invention.
Claims (10)
1. A decoupling method for a multi-link rear suspension rod system is characterized by comprising the following steps: confirming four-wheel positioning parameter points based on a suspension rod system; establishing a motion model based on a suspension hard point and a four-wheel positioning parameter point, and after applying a constraint to the four-wheel positioning parameter point based on the motion model, simulating to obtain a four-wheel positioning toe-in parameter change curve and a four-wheel positioning camber parameter change curve caused by the motion of a single four-wheel positioning parameter point; acquiring a four-wheel positioning camber angle change range and a four-wheel positioning toe angle change range based on the four-wheel positioning toe parameter change curve and the four-wheel positioning camber parameter change curve; if and only if the four-wheel positioning camber angle variation range and the four-wheel positioning toe-in angle variation range of the four-wheel positioning parameter point satisfy the following principle, the four-wheel positioning parameter point can be adjusted,
principle 1: when a four-wheel positioning parameter point is changed, only the variation of a four-wheel positioning toe-in parameter is influenced, the variation of a four-wheel positioning camber parameter is less than or equal to +/-8 ', or only the variation of a four-wheel positioning camber parameter is influenced, and the variation of a four-wheel positioning toe-in parameter is less than or equal to +/-8';
principle 2: when a coupling phenomenon exists between one four-wheel positioning parameter point and the other four-wheel positioning parameter point, the four-wheel positioning toe-in parameter change interval of the four-wheel positioning parameter point which does not meet the principle 1 is positioned in the four-wheel positioning toe-in parameter change interval of the four-wheel positioning parameter point which meets the principle 1, and the four-wheel positioning camber parameter change interval of the four-wheel positioning parameter point which does not meet the principle 1 is positioned in the four-wheel positioning camber parameter change interval of the four-wheel positioning parameter point which meets the principle 1.
2. The method of decoupling a multi-link rear suspension linkage according to claim 1, wherein: the hinge point between any two suspension connecting rods in the suspension rod system is a four-wheel positioning parameter point.
3. The method of decoupling a multi-link rear suspension linkage according to claim 1, wherein: in the DMU module of the cata software, the construction of a motion model is realized based on suspension hard points and four-wheel positioning parameter points.
4. The method of decoupling a multi-link rear suspension linkage according to claim 1, wherein: the method for applying constraint to four-wheel positioning parameter points based on the motion model comprises the following steps: and applying direction constraint and distance constraint to each four-wheel positioning parameter point.
5. The method of decoupling a multi-link rear suspension linkage according to claim 4, wherein: the direction constraint comprises an X-axis constraint, a Y-axis constraint or a Z-axis constraint, and the four-wheel positioning parameter points have only one motion freedom degree constrained along the direction after the direction constraint is applied.
6. The method of decoupling a multi-link rear suspension linkage according to claim 4, wherein: the distance constraint comprises a movement distance constrained to move along the direction, wherein the movement distance is less than or equal to 5mm and less than or equal to +5 mm.
7. The method of decoupling a multi-link rear suspension linkage according to claim 1, wherein: the X-axis direction of the four-wheel positioning toe-in parameter change curve is the movement distance of the four-wheel positioning parameter point along the constraint direction, and the Y-axis direction of the four-wheel positioning toe-in parameter change curve is the inclination angle of the plane where the four wheels are located relative to the horizontal plane.
8. The method of decoupling a multi-link rear suspension linkage according to claim 1, wherein: the X-axis direction of the four-wheel positioning camber parameter change curve is the movement distance of the four-wheel positioning parameter point along the constraint direction, and the Y-axis direction of the four-wheel positioning camber parameter change curve is the inclination angle of the plane where the four wheels are located relative to the horizontal plane.
9. The method of decoupling a multi-link rear suspension linkage according to claim 1, wherein: when principle 1 is not satisfied, the analysis is re-modeled by adjusting the hard spot locations or replacing a different imposed constraint scheme.
10. The method of decoupling a multi-link rear suspension linkage according to claim 1, wherein: outputting adjustable four-wheel positioning parameter points and a constraint applying scheme corresponding to the four-wheel positioning parameter points.
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| CN202110561019.3A CN113221249B (en) | 2021-05-19 | 2021-05-19 | Decoupling method for multi-connecting-rod rear suspension rod system |
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| JP2010089601A (en) * | 2008-10-07 | 2010-04-22 | Toyota Motor Corp | Alignment adjusting mechanism of torsion beam type suspension |
| BRPI1001095A2 (en) * | 2010-04-09 | 2011-11-29 | Tecnomotor Eletrenica Do Brasil S A | improvement in apparatus for measuring the geometry elements of a vehicle suspension |
| CN101915673B (en) * | 2010-09-06 | 2012-12-19 | 华南理工大学 | Wheel load-based type intelligent sensing four-wheel positioning measurement method |
| EP3850306A4 (en) * | 2018-09-13 | 2022-09-21 | Snap-On Incorporated | Automotive aligner with improved accuracy and no-stop positioning using a drive direction calculation |
| CN112665879A (en) * | 2020-12-31 | 2021-04-16 | 华中科技大学 | Target surface deviation measuring and adjusting method and device of wheel pose measuring system |
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