CN112849281B - Engine based on mechanical suspension cab and cab rapid positioning method - Google Patents
Engine based on mechanical suspension cab and cab rapid positioning method Download PDFInfo
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- CN112849281B CN112849281B CN202110305232.8A CN202110305232A CN112849281B CN 112849281 B CN112849281 B CN 112849281B CN 202110305232 A CN202110305232 A CN 202110305232A CN 112849281 B CN112849281 B CN 112849281B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D33/00—Superstructures for load-carrying vehicles
- B62D33/06—Drivers' cabs
- B62D33/0604—Cabs insulated against vibrations or noise, e.g. with elastic suspension
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K5/00—Arrangement or mounting of internal-combustion or jet-propulsion units
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Abstract
The invention provides an engine based on a mechanical suspension cab and a cab quick positioning methodThe method comprises the steps of inputting the initial positioning of an engine and the initial positioning of a mechanically suspended cab and further inputting a target function f (H) of the ground clearance of a front floor of the mechanically suspended cab0,H1,H2,H3) And the final positioning of the engine and the final positioning of the mechanical suspension cab are quickly determined, so that the quick definition of the size hard spot in the forward research and development process of the whole vehicle is realized. Introduction of the objective function f (H) of the present invention0,H1,H2,H3) Quantifying the positioning process of the engine and the mechanical suspension cab in the form of an objective function; the method has the advantages that the target is clear, the positioning cycle process is simple and clear, the problem that the floor of the mechanical suspension cab is easily interfered with an engine in the development process of the vehicle type of the mechanical suspension cab is solved due to the introduction of beta, gamma and alpha control coefficients, and the workload of positioning the engine and the mechanical suspension cab in the development process of new vehicle types of enterprise research and development personnel is greatly reduced.
Description
Technical Field
The invention relates to an engine and a cab positioning method, in particular to a mechanical suspension cab-based engine and a cab quick positioning method.
Background
In recent years, the rapid development of the transportation industry promotes the development of light, medium and heavy commercial vehicles, so that the demand of market change can be quickly responded, and the creation of new vehicle types meeting the customer demand is always a hot point of attention of various commercial vehicle enterprises in the industry. The positioning of an engine and a mechanical suspension cab is taken as a key step of a size hard point definition process in the forward research and development process of the whole automobile and always plays a significant role; in the development process of a new vehicle model with a mechanical suspension cab, the condition that the floor of the mechanical suspension cab is interfered with an engine is easy to occur because the reserved quantity between the floor of the mechanical suspension cab and an engine body is difficult to accurately control; it is always difficult for enterprise research personnel to master the positioning of an engine and a mechanical suspension cab in the process of defining the hard spot of the size of a new vehicle model. Therefore, it is an urgent need to provide a method for quickly positioning an engine and a mechanically suspended cab, which can solve the above problems.
Disclosure of Invention
The invention aims to provide an engine based on a mechanical suspension cab and a cab quick positioning method, so that the positioning work is simple and clear and can be quantized.
In order to achieve the purpose, the invention is realized by the following technical scheme:
an engine based on mechanical suspension cab and a cab quick positioning method are started by inputting an engine initial positioning (E10, E20, E30) and a mechanical suspension cab initial positioning (C10, C20), and according to a target function f (H) of the ground clearance of a front floor of the mechanical suspension cab0,H1,H2,H3)=β[H0+γH1+(HE1+HE2)+αH3]-CbThe method comprises the following steps of quickly determining final engine positioning (E1, E2, E3) and final mechanical suspension cab positioning (C1, C2), and specifically:
step 1, inputting initial positioning: the method comprises the steps of initial positioning (E10, E20, E30) of an engine and initial positioning (C10, C20) of a mechanical suspension cab;
step 2, judging the height H of the engine from the groundEHeight difference H between front axle I-beam and engine oil pan1Whether or not to satisfy HEAnd H1The corresponding control requirements are as follows: outputting the height H of the engine from the ground after inputting the initial positioning (E10, E20, E30) of the engineEProceed step 2 to judge HEWhether or not to satisfy HEControl requirement when HESatisfy HEOutputting the height difference H between the I-beam of the front axle and the oil pan of the engine according to the control requirement1And to H1Make a judgment as to whether or not H is satisfied1Control requirement when H1Satisfy H1Control request is then output H1(ii) a Otherwise, when HEAnd H1Do not satisfy corresponding HEAnd H1Returns to step 1 to readjust the input engine initial position (E10, E20, E30);
step 3, judging the height difference H between the engine and the mechanical suspension cab floor3Whether or not to satisfy H3The control requirements are as follows: when the input mechanical suspension cab is initially positioned (C10, C20), the height difference H between the output engine and the mechanical suspension cab floor is output3Proceed step 3 to judge H3Whether or not to satisfy H3On the control demand when H3Satisfy H3Control request is output H3(ii) a Otherwise, when H3Does not satisfy H3When the control requires, returning to the step 1 to readjust the initial positioning of the input mechanical suspension cab (C10, C20);
step 4, judging the ground clearance H of the floor before the mechanical suspension cabCWhether or not to satisfy HCThe control requirements are as follows: after the steps 1, 2 and 3 are finished, according to an objective function f (H) of the ground clearance of the floor in front of the mechanical suspension cab0,H1,H2,H3)=β[H0+γH1+(HE1+HE2)+αH3]-CbFinding HCStep 4 is carried out to judge HCWhether or not to satisfy HCOn the control demand when HCSatisfy HCIf the control requirement is met, performing step 5; otherwise, when HCDoes not satisfy HCControl returns to step 1 to readjust the initial engine positioning (E10, E20, E30), initial mechanical suspension cab positioning (C10, C20) and engine sump height H when requestedE1In the formula: h0The difference value between the static load radius of the tire and the front axle drop is obtained; hE1Is the engine sump height; hE2Is the engine block height; cbThe height difference of the front floor and the rear floor of the mechanical suspension cab is obtained; beta is the ground clearance control coefficient of the floor before the mechanical suspension cab; gamma is a height difference control coefficient between the front axle I-beam and an engine oil sump; alpha is the height difference control coefficient of the rear floor of the engine and the mechanical suspension cab;
step 5, outputting final positioning: including final engine positioning (E1, E2, E3) and final mechanical suspension cab positioning (C1, C2).
Preferably, in the step 4, a ground clearance control coefficient β of a front floor of the mechanically suspended cab is a set fixed value, and a value range of β is 0.97 to 1.01; the height difference control coefficient gamma of the front axle I-beam and the engine oil pan is a set fixed value, and the value range of gamma is 0.93-1.16; the height difference control coefficient alpha of the rear floor of the engine and the mechanical suspension cab is a set fixed value, and the value range of alpha is 0.98-1.05.
Preferably, the height H of the engine from the ground isEThe control requirement is more than or equal to 290 mm; height difference H between front axle I-beam and engine oil sump1Controlling the required value to be more than or equal to 35 mm; height difference H between engine and mechanical suspension cab floor3The control requirement is more than or equal to 45 mm; mechanical suspension driver's cabin floor ground clearance HCThe control requirement is equal to or less than 832 mm.
The invention has the advantages that: introduction of the objective function f (H) of the invention0,H1,H2,H3) Quantifying the positioning process of the engine and the mechanical suspension cab in the form of an objective function; the method has the advantages that the target is clear, the positioning cycle process is simple and clear, the problem that the floor of the mechanical suspension cab is easily interfered with an engine in the development process of the vehicle type of the mechanical suspension cab is solved due to the introduction of beta, gamma and alpha control coefficients, and the workload of positioning the engine and the mechanical suspension cab in the development process of new vehicle types of enterprise research and development personnel is greatly reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
FIG. 1 is a flow chart of a fast positioning method according to an embodiment of the present invention
FIG. 2 is a schematic engine positioning diagram of an embodiment of the present invention.
Fig. 3 is a schematic view of a mechanically suspended cab positioning according to an embodiment of the invention.
In the figure: (E1, E2, E3) engine positioning, (C1, C2) mechanical suspension cab positioning, H0Difference between static load radius of tire and front axle drop, H1Height difference between front axle I-beam and engine oil sump, H2Height of engine, HE1Height of engine sump, HE2Height of engine block, H3Height difference of rear floor of engine and mechanical suspension cab, HEHeight of engine above ground, HEHeight of engine above ground, HCHeight of floor above ground before the mechanically suspended cab, CbThe difference in the height of the front and rear floors of the mechanically suspended cab.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
The final positioning of the engine (E1, E2, E3) based on the mechanically suspended cab engine and the cab quick positioning method according to the embodiment of the present invention will be described with reference to fig. 2. In the embodiment, the origin of coordinates O is the intersection point of the lower airfoil surface of the frame, the central plane of the front axle and the central symmetrical plane of the frame; e1 is the distance from the frame lower airfoil surface to the centerline of the engine crankshaft, E2 is the angle formed by the centerline of the engine crankshaft and the frame lower airfoil surface, and E3 is the length of the centerline of the engine crankshaft along the angle direction of E2.
The final positioning of the mechanically suspended cab (C1, C2) based on the engine of the mechanically suspended cab and the quick positioning method of the cab according to the embodiment of the present invention will be described with reference to fig. 3. In the embodiment, C1 is the distance between the center of mass point of the mechanical suspension cab and the lower airfoil surface of the frame; c2 is the distance of the mechanically suspended cab centroid point from the front axle center plane.
The invention discloses a mechanical suspension cab-based engine and cab rapid positioning method, and a flow chart is shown in fig. 3, wherein the positioning method comprises the following steps:
step 1, inputting initial positioning: the method comprises the steps of initial positioning (E10, E20, E30) of an engine and initial positioning (C10, C20) of a mechanical suspension cab;
step 2, judging the height H of the engine from the groundEHeight difference H between front axle I-beam and engine oil pan1Whether or not to satisfy HEAnd H1The corresponding control requirements are as follows: outputting the height H of the engine from the ground after inputting the initial positioning (E10, E20, E30) of the engineEProceed step 2 to judge HEWhether or not to satisfy HEControl requirement when HESatisfy HEOutputting the height difference H between the I-beam of the front axle and the oil pan of the engine according to the control requirement1And to H1Making a judgment as to whether H is satisfied1Control requirement when H1Satisfy H1Control request is then output H1(ii) a Otherwise, when HEAnd H1Do not satisfy corresponding HEAnd H1Returns to step 1 to readjust the input engine initial position (E10, E20, E30);
step 3, judging the height difference H between the engine and the mechanical suspension cab floor3Whether or not to satisfy H3The control requirements are as follows: when the input mechanical suspension cab is initially positioned (C10, C20), the height difference H between the output engine and the mechanical suspension cab floor is output3Proceed step 3 to judge H3Whether or not to satisfy H3Control requirement when H3Satisfy H3Control request is then output H3(ii) a Otherwise, when H3Not satisfying H3When the control requires, returning to the step 1 to readjust the initial positioning of the input mechanical suspension cab (C10, C20);
step 4, judging the ground clearance H of the floor before the mechanical suspension cabCWhether or not to satisfy HCThe control requirements are as follows: after the steps 1, 2 and 3 are finished, according to an objective function f (H) of the ground clearance of the floor in front of the mechanical suspension cab0,H1,H2,H3)=β[H0+γH1+(HE1+HE2)+αH3]-CbFind HCStep 4 is carried out to judge HCWhether or not to satisfy HCControl requirement when HCSatisfy HCIf the control requirement is met, performing step 5; otherwise, when HCDoes not satisfy HCControl returns to step 1 to readjust the initial engine positioning (E10, E20, E30), initial mechanical suspension cab positioning (C10, C20) and engine sump height H when requestedE1In the formula: h0The difference value between the static load radius of the tire and the front axle drop is obtained; hE1Is the engine sump height; hE2Is the engine block height; cbThe height difference of the front floor and the rear floor of the mechanical suspension cab is obtained; beta is the ground clearance control coefficient of the floor before the mechanical suspension cab; gamma is a height difference control coefficient of the front axle I-beam and the engine oil pan; alpha is the height difference control coefficient of the rear floor of the engine and the mechanical suspension cab;
step 5, outputting final positioning: including final engine positioning (E1, E2, E3) and final mechanical suspension cab positioning (C1, C2).
In the present embodiment, the height H of the engine from the groundEThe control requirement is more than or equal to 290 mm; height difference H between front axle I-beam and engine oil sump1The control requirement is more than or equal to 35 mm; height difference H between rear floor of engine and mechanical suspension cab3Controlling the required value to be more than or equal to 45 mm; mechanical suspension cab front floor ground clearance HCThe control requirement is that the thickness is equal to or less than 832 mm; the ground clearance control coefficient beta of the front floor of the mechanical suspension cab is 1; the height difference control coefficient gamma of the front axle I-beam and the engine oil pan is 1.14; the height difference control coefficient alpha of the front floor of the engine and the mechanical suspension cab is 1.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the present invention.
Claims (3)
1. An engine based on a mechanical suspension cab and a cab rapid positioning method are characterized in that the positioning method comprises the following steps:
step 1, inputting initial positioning: the method comprises the steps of initial positioning of an engine (E10, E20, E30) and initial positioning of a mechanical suspension cab (C10, C20);
step 2, judging the height H of the engine from the groundEHeight difference H between front axle I-beam and engine oil pan1Whether or not to satisfy HEAnd H1The corresponding control requirements are as follows: outputting the height H of the engine from the ground after inputting the initial positioning (E10, E20, E30) of the engineEStep 2 is carried out to judge HEWhether or not to satisfy HEOn the control demand when HESatisfy HEOutputting the height difference H between the I-beam of the front axle and the oil pan of the engine according to the control requirement1And to H1Make a judgment as to whether or not H is satisfied1On the control demand when H1Satisfy H1Control request is then output H1(ii) a Otherwise, when HEAnd H1Do not satisfy corresponding HEAnd H1Returns to step 1 to readjust the input engine initial position (E10, E20, E30);
step 3, judging the height difference H between the engine and the floor of the mechanical suspension cab3Whether or not to satisfy H3The control requirements are as follows: when the input mechanical suspension cab is initially positioned (C10, C20), the height difference H between the output engine and the mechanical suspension cab floor is output3Proceed step 3 to judge H3Whether or not to satisfy H3On the control demand when H3Satisfy H3Control request is then output H3(ii) a Otherwise, when H3Not satisfying H3When the control requires, returning to the step 1 to readjust the initial positioning of the input mechanical suspension cab (C10, C20);
step 4, judging the ground clearance H of the floor before the mechanical suspension cabCWhether or not to satisfy HCThe control requirements are as follows: after the steps 1, 2 and 3 are finished, according to a ground clearance target function f (H) of a floor in front of a mechanical suspension cab0,H1,H2,H3)=β[H0+γH1+(HE1+HE2)+αH3]-CbFinding HCStep 4 is carried out to judge HCWhether or not to satisfy HCControl requirement when HCSatisfy HCIf the control requirement is met, performing step 5; otherwise, when HCNot satisfying HCControl reverts to step 1 to readjust engine initial positioning (E10, E20, E30), mechanical suspension cab initial positioning (C10, C20) when requested; and adjusting the height H of the engine oil panE1In the formula: h0The difference value between the static load radius of the tire and the front axle drop is obtained; hE1Is the engine sump height; hE2Is the engine block height; cbThe height difference of the front floor and the rear floor of the mechanical suspension cab is obtained; beta is the ground clearance control coefficient of the floor before the mechanical suspension cab; gamma is a height difference control coefficient of the front axle I-beam and the engine oil pan; alpha is the height difference control coefficient of the rear floor of the engine and the mechanical suspension cab;
step 5, outputting final positioning: including final engine positioning (E1, E2, E3) and final mechanical suspension cab positioning (C1, C2).
2. The engine and cab fast positioning method based on the mechanical suspension cab as claimed in claim 1, wherein in the step 4, the control coefficient β of the ground clearance of the front floor of the mechanical suspension cab is a set fixed value, and the value range of β is 0.97 to 1.01; the height difference control coefficient gamma of the front axle I-beam and the engine oil pan is a set fixed value, and the value range of gamma is 0.93-1.16; the height difference control coefficient alpha of the rear floor of the engine and the mechanical suspension cab is a set fixed value, and the value range of alpha is 0.98-1.05.
3. The mechanically suspended cab-based engine and cab quick positioning method according to claim 1, wherein the height H of the engine from the ground isEThe control requirement is more than or equal to 290 mm; height difference H between front axle I-beam and engine oil sump1Controlling the required value to be more than or equal to 35 mm; height difference H between engine and mechanical suspension cab floor3The control requirement is more than or equal to 45 mm; mechanical suspension driver's cabin floor ground clearance HCThe control requirement is equal to or less than 832 mm.
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DE3644959C2 (en) * | 1986-05-28 | 1994-03-03 | Man Nutzfahrzeuge Ag | Front flap opening and closing mechanism for a front wall part hinged to the driver's cab of a front steering truck |
JP3912765B2 (en) * | 2000-01-17 | 2007-05-09 | 日野自動車株式会社 | Car body of cab-over type vehicle |
CN103121475B (en) * | 2013-03-08 | 2015-06-10 | 山东理工大学 | Design method for optimal damping ratio of suspension system of cab |
CN106289809B (en) * | 2016-10-25 | 2018-12-07 | 吉林大学 | The instrument board blind area measuring device and its localization method that a kind of and H point device is used cooperatively |
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