CN115339424B - Ergonomic brake pedal track arrangement method - Google Patents
Ergonomic brake pedal track arrangement method Download PDFInfo
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- CN115339424B CN115339424B CN202210891605.9A CN202210891605A CN115339424B CN 115339424 B CN115339424 B CN 115339424B CN 202210891605 A CN202210891605 A CN 202210891605A CN 115339424 B CN115339424 B CN 115339424B
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- 238000000034 method Methods 0.000 title claims abstract description 50
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T7/00—Brake-action initiating means
- B60T7/02—Brake-action initiating means for personal initiation
- B60T7/04—Brake-action initiating means for personal initiation foot actuated
- B60T7/06—Disposition of pedal
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Braking Elements And Transmission Devices (AREA)
Abstract
The invention provides a brake pedal track arrangement method based on ergonomics, and belongs to the field of automobiles. The method solves the problems that in the prior art, the arrangement method of the brake pedal is not clear because the position of the center point and the pedal starting angle of the free state of the brake pedal are set according to the position of the foot of a human body, particularly the pedal track which gives out the best braking force based on the sitting posture of the human body, the arrangement requirement of the lever ratio and the booster is not fully considered in the arrangement process of the brake pedal, the arrangement repetition problem easily occurs, and the arrangement integrity is lacking. The invention provides an ergonomic brake pedal track arrangement method, which is characterized in that a pedal track interval is set according to the sitting posture of a human body, so that a driver can exert optimal braking force in the conventional braking process, the lever ratio and the booster arrangement requirements are considered, and the final track of the pedal is set, so that the structure and the performance requirements are met.
Description
Technical Field
The invention belongs to the field of automobiles, and particularly relates to an ergonomic brake pedal track arrangement method.
Background
At present, the prior art patent sets the center point position and the pedal starting angle of the free state of the brake pedal according to the position of the foot of the human body, and does not define the brake pedal track arrangement method, especially the pedal track which gives out the best braking force based on the sitting posture of the human body. Moreover, the lever ratio and the booster arrangement requirement are not fully considered in the brake pedal arrangement process, the arrangement repetition problem is easy to occur, and the arrangement integrity is lacking.
Patent document (CN 113978246 a) discloses a method of arranging suspended three pedals, which sets a difference in height between a brake pedal point and a heel point and an initial angle of the brake pedal according to a sitting posture of a platform driver. The method only simply illustrates how to set the two parameters of the brake pedal, does not define the track and the arrangement method of the brake pedal, does not refer to the lever ratio and the arrangement requirement of the booster in the arrangement process of the brake pedal, easily causes the arrangement repetition problem, and lacks the arrangement integrity of the brake pedal.
Disclosure of Invention
In view of the above, in order to solve the problem of the prior art in the arrangement method of the brake pedal, the center point position and the pedal start angle of the free state of the brake pedal are set according to the position of the foot of the human body, and the arrangement method of the brake pedal track is not clear, in particular the pedal track which gives out the best braking force based on the sitting posture of the human body; in addition, the lever ratio and the booster arrangement requirements are not fully considered in the brake pedal arrangement process, the arrangement repetition problem is easy to occur, and the arrangement integrity problem is lacking.
In order to achieve the above purpose, the present invention adopts the following technical scheme: an ergonomic brake pedal trajectory placement method specifically comprises the following steps:
the method specifically comprises the following steps:
(1) Drawing a brake pedal rotation track chord permission section, wherein the rotation track chord passes through an initial position brake pedal point B, the included angle between the connecting line of a driver taking datum point S and an initial position accelerator pedal point A is within +/-5 degrees, and the initial rotation track chord is parallel to the connecting line of the driver taking datum point S and the initial position accelerator pedal point A;
(2) Drawing an arc with any radius through two endpoints of a pedal rotating track chord, wherein the center of the arc is used as the pedal rotating center, the radius of the initial fixed arc can refer to the same platform vehicle type, the brake pedal rotating center can be pushed out according to the radius of the arc, and the rotating radius and the rotating track of the connecting point of a booster push rod and a pedal swing arm can be pushed out according to the lever ratio;
(3) Referring to the same-platform vehicle type, locking the relative positions of the booster and the pedal bracket according to the arrangement requirements of the booster and the pedal bracket;
(4) According to the stroke of the booster push rod and the requirement of the limit swing angle, making a rotation track allowing interval of the connection point of the booster push rod and the pedal swing arm;
(5) The arrangement positions of the booster and the pedal support are adjusted, so that the brake pedal support can design a pedal rotation center structure, and meanwhile, the full-stroke rotation track of the connection point of the booster push rod and the pedal swing arm is required to be located in an allowed interval.
Still further, the ergonomic brake pedal trajectory placement method specifically includes the steps of:
(1) Drawing a straight line L1 passing through the driver taking datum point S and the initial position accelerator pedal point A;
(2) Making two line segments L2 and L3 at the brake pedal point B passing through the initial position, wherein an included angle between the line segment L2 and the line segment L3 is +/-5 degrees, and an included angle area between the line segment L2 and the line segment L3 is an allowed section of a brake pedal rotation track chord; making a line segment L0 at the brake pedal point B passing through the initial position, wherein an included angle between the line segment L0 and the straight line L1 is 0 DEG, and the line segment L0 is an initial rotation track chord of the brake pedal point B;
(3) Drawing a perpendicular bisector L4 of a rotation track chord L0 of a brake pedal point B, drawing a circular arc L5 by taking the brake pedal point B as a center and taking a circular arc radius R of the rotation track of the brake pedal point of the same platform vehicle type as a radius, wherein an intersection point of the circular arc and the perpendicular bisector of the rotation track chord L0 is the rotation center o of the brake pedal, and pushing out a rotation radius R and a rotation track L6 of a connection point N of a push rod MN and a pedal swing arm of a booster B according to a lever ratio i;
(4) Setting the axial distance L9 between the booster b and the pedal bracket c according to the arrangement requirements of the booster b and the pedal bracket c, and locking the relative positions of the booster and the pedal bracket;
(5) The connection point M of the booster b and the push rod MN moves along the axis L7 of the booster b, the movement stroke is L10, and a rotation track allowable interval 1-2-3-4 of the connection point N of the push rod MN and the pedal swing arm b can be made according to the length of the push rod MN and the requirement of the limit swing angle theta;
(6) And the arrangement positions of the booster b and the pedal bracket c are adjusted, so that the brake pedal bracket c can design a pedal rotation center structure d, and meanwhile, the stroke rotation track L6 of the connection point N of the push rod MN and the pedal swing arm b is required to be ensured to be positioned in an allowable range 1-2-3-4.
Furthermore, if the arrangement position schemes of the booster b and the pedal bracket c cannot meet the requirements, the arc radius of the rotation track of the brake pedal point is adjusted, and the arrangement method is repeated.
Further, if the radius of the arc of the rotation track of the brake pedal point is not feasible, the chord angle of the rotation track of the brake pedal is adjusted, and the arrangement method is repeated until all the arrangement requirements are met.
Furthermore, the specific method for adjusting the chord angle of the rotation track of the brake pedal comprises the following steps: and adjusting the angle L0 of the rotation track chord of the brake pedal in the allowable section of the rotation track chord of the brake pedal.
Further, the allowable section of the brake pedal rotation track chord is the included angle area of the line segments L2 and L3.
Still further, the lengths of L0, L2 and L3 are all 80mm.
Further, the initial position accelerator pedal point A is a point of a distance of 200mm from the heel of the foot.
Furthermore, 1 point in the allowed interval 1-2-3-4 represents the N point position of the joint M with the motion travel of L10 and the included angle theta/2 between MN and the axis L7; 2 points represent N points of the connecting point M with the motion stroke of 0 and the included angle-theta/2 between MN and the axis L7; the 3 point represents the N point position of the joint M with the motion stroke of 0 and the included angle theta/2 between the MN and the axis L7; the 4 point represents the N point position of the connecting point M with the motion stroke of 0 and the included angle-theta/2 between the MN and the axis L7.
Compared with the prior art, the brake pedal track arrangement method based on the ergonomics has the beneficial effects that:
(1) Compared with other brake pedal arrangement methods, the invention not only can ensure that a driver exerts optimal braking force in the conventional braking process, but also can meet the requirements of the lever ratio, the brake pedal bracket and the booster arrangement.
(2) During the braking process, the force generated by the driver is transmitted to the human foot through the driver sitting datum point S to act on the brake pedal point B for braking, the human body force generating direction is the same as the straight line L1 connecting the driver sitting datum point S and the initial position accelerator pedal point A, and generally, the chord length of the pedal track for conventional braking is about 80mm. The method for arranging the brake pedal can ensure that the included angle between the human body force-generating direction (the pedal track chord L0 direction) and the tangential direction of each point of the pedal track is minimum during normal braking, thereby ensuring that the human body acting force generates the maximum braking moment and ensuring that the braking system exerts the optimal braking force. The lever ratio, the brake pedal bracket and the booster arrangement requirements are used as premise input to iterate in the brake pedal track arrangement method, and the arrangement scheme meets the multi-target requirements.
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 invention. In the drawings:
fig. 1 is a schematic view of a driver seating reference point S and brake pedal point B connected together;
FIG. 2 is a schematic diagram of a brake pedal point rotation trajectory chord permissible interval and an initial rotation trajectory chord;
FIG. 3 is a schematic view of the rotational trajectory of the brake pedal center of rotation and the points of attachment of the booster push rod to the pedal swing arm;
FIG. 4 is a schematic diagram of a rotation track allowing interval of a connection point of a booster push rod and a pedal swing arm; point 1 represents the N point position of the joint M with the motion travel of L10 (limit position) and the included angle theta/2 (allowable limit swing angle) between MN and the axis L7; the 2 point represents the N point position of the connecting point M with the motion travel of L10 (limit position), the included angle-theta/2 (allowable limit swing angle) between the MN and the axis L7; the 3 point represents the N point position of the connecting point M with the motion stroke of 0 (initial position) and the included angle theta/2 (allowable limit swing angle) between the MN and the axis L7; the 4 point represents the N point position of the connecting point M with the motion stroke of 0 (initial position) and the included angle-theta/2 (allowable limit swing angle) between the MN and the axis L7;
FIG. 5 is a schematic illustration of the relative positions of the booster and pedal bracket locked;
FIG. 6 is a schematic view of the center of rotation of the pedal on the pedal bracket;
FIG. 7 is a schematic view of a travel rotation rail of a connection point of a booster push rod and a pedal swing arm and an allowable section;
in the figure: the device comprises an accelerator pedal point at an initial position A, a brake pedal point B, a riding datum point of an S-driver, a connecting point of an N-pedal swing arm, a connecting point of an M-booster B and a push rod MN, an a-pedal swing arm, a B-booster and a c-pedal bracket.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It should be noted that, in the case of no conflict, embodiments of the present invention and features of the embodiments may be combined with each other, and the described embodiments are only some embodiments of the present invention, not all embodiments.
1. Detailed description of the preferred embodimentthe present embodiment, with reference to fig. 1-7, is described an ergonomic brake pedal trajectory placement method,
as shown in fig. 1, a straight line L1 is drawn that crosses the driver' S reference point S and the brake pedal point B.
As shown in FIG. 2, two line segments L2 and L3 are made at the brake pedal point B at the initial position, the length is 80mm, the included angle between the line segment L2 and the line segment L3 is +/-5 degrees, and the included angle area of the line segment L2 and the line segment L3 is the allowed section of the brake pedal rotation track chord (80 mm length). And the brake pedal point B at the initial position is taken as a line segment L0, the length is 80mm, the included angle between the line segment L0 and the straight line L1 is 0 degrees, and the line segment L0 is the initial rotation track chord of the brake pedal point B.
As shown in fig. 3, a perpendicular bisector L4 of a rotation locus chord L0 of a brake pedal point B is drawn, an arc L5 is drawn with the brake pedal point B as a center and an arc radius R of the rotation locus of the brake pedal point of the same platform vehicle type as a radius, and an intersection point of the arc and the perpendicular bisector of the rotation locus chord L0 is the rotation center o of the brake pedal, and a rotation radius R and a rotation locus L6 of a connection point N between a push rod MN of a booster B and a pedal swing arm a can be deduced according to a lever ratio i.
As shown in fig. 4 to 5, according to the arrangement requirements of the booster b and the pedal bracket c, the axial distance L9 between the booster b and the pedal bracket c is set by setting the axis L7 of the booster b to be matched with the axis L8 of the pedal bracket c, and the relative positions of the booster and the pedal bracket are locked.
The connection point M of the booster b and the push rod MN moves along the axis L7 of the booster b, the movement stroke is L10, and the rotation track allowable section 1-2-3-4 of the connection point N of the push rod MN and the pedal swing arm b can be made according to the length of the push rod MN and the limit swing angle theta requirement.
The interval 1-2-3-4 represents the set of connection points N within the limit swing angle θ of the satisfying MN. Point 1 represents the N point position of the joint M with the motion travel of L10 (limit position) and the included angle theta/2 (allowable limit swing angle) between MN and the axis L7; the 2 point represents the N point position of the connecting point M with the motion travel of L10 (limit position), the included angle-theta/2 (allowable limit swing angle) between the MN and the axis L7; the 3 point represents the N point position of the connecting point M with the motion stroke of 0 (initial position) and the included angle theta/2 (allowable limit swing angle) between the MN and the axis L7; the 4 th point represents the N-th point position where the movement stroke of the connecting point M is 0 (initial position), and the MN forms an angle- θ/2 (allowable limit pivot angle) with the axis L7.
As shown in fig. 6 and 7, the arrangement positions of the booster b and the pedal bracket c are adjusted to ensure that the brake pedal bracket c can design a pedal rotation center structure d, and meanwhile, the stroke rotation track L6 of the connection point N of the push rod MN and the pedal swing arm b is required to be located in the allowed interval 1-2-3-4.
As shown in fig. 3, if the arrangement position scheme of the booster and the pedal bracket cannot meet the requirement, the arc radius R of the rotation track of the brake pedal point is adjusted, and the arrangement method is repeated.
As shown in fig. 2, if it is not feasible to adjust the radius R of the arc of the rotation locus of the brake pedal point, the angle L0 of the rotation locus of the brake pedal is adjusted in the allowable range (the included angle between line segments L2 and L3) of the rotation locus chord (80 mm length) of the brake pedal, and the above arrangement method is repeated until all the arrangement requirements are satisfied.
The invention relates to an ergonomic brake pedal track arrangement method, which comprises the following working principles:
during the braking process, the force generated by the driver is transmitted to the human foot through the driver sitting datum point S to act on the brake pedal point B for braking, the human body force generating direction is the same as the straight line L1 connecting the driver sitting datum point S and the initial position accelerator pedal point A, and generally, the chord length of the pedal track for conventional braking is about 80mm. The method for arranging the brake pedal can ensure that the included angle between the human body force-generating direction (the pedal track chord L0 direction) and the tangential direction of each point of the pedal track is minimum during normal braking, thereby ensuring that the human body acting force generates the maximum braking moment and ensuring that the braking system exerts the optimal braking force. The lever ratio, the brake pedal bracket and the booster arrangement requirements are used as premise input to iterate in the brake pedal track arrangement method, and the arrangement scheme meets the multi-target requirements.
The embodiments of the invention disclosed above are intended only to help illustrate the invention. The examples are not intended to be exhaustive or to limit the invention to the precise forms disclosed. Many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention.
Claims (8)
1. An ergonomic brake pedal trajectory placement method, characterized by: the method specifically comprises the following steps:
(1) Drawing a brake pedal rotation track chord permission section, wherein the rotation track chord passes through an initial position brake pedal point (B), so that an included angle between the rotation track chord and a connecting line of a driver riding datum point (S) and an initial position accelerator pedal point (A) is within +/-5 DEG, and an initial rotation track chord is parallel to the connecting line of the driver riding datum point (S) and the initial position accelerator pedal point (A);
(2) Drawing an arc with any radius through two endpoints of a pedal rotating track chord, wherein the center of the arc is used as the pedal rotating center, the radius of the initial fixed arc can refer to the same platform vehicle type, the brake pedal rotating center can be pushed out according to the radius of the arc, and the rotating radius and the rotating track of the connecting point of a booster push rod and a pedal swing arm can be pushed out according to the lever ratio;
(3) Referring to the same-platform vehicle type, locking the relative positions of the booster and the pedal bracket according to the arrangement requirements of the booster and the pedal bracket;
(4) According to the stroke of the booster push rod and the requirement of the limit swing angle, making a rotation track allowing interval of the connection point of the booster push rod and the pedal swing arm;
(5) The arrangement positions of the booster and the pedal support are adjusted, so that the brake pedal support can design a pedal rotation center structure, and meanwhile, the full-stroke rotation track of the connection point of the booster push rod and the pedal swing arm is required to be located in an allowed interval.
2. The ergonomic brake pedal trajectory placement method of claim 1, wherein: the method specifically comprises the following steps:
(1) Drawing a straight line L1 passing through the driver sitting reference point (S) and the initial position accelerator pedal point (A);
(2) Making two line segments L2 and L3 at the position passing through the initial position of the brake pedal point (B), wherein an included angle between the line segment L2 and the line segment L3 is +/-5 degrees, and an included angle area between the line segment L2 and the line segment L3 is an allowed interval of a brake pedal rotating track chord; making a line segment L0 from the brake pedal point (B) at the initial position, wherein an included angle between the line segment L0 and the straight line L1 is 0 DEG, and the line segment L0 is a chord of the initial rotation track of the brake pedal point (B) at the initial position;
(3) Drawing a vertical bisector L4 of an initial rotation track chord of an initial position brake pedal point (B), drawing an arc L5 by taking the initial position brake pedal point (B) as a center and taking the arc radius R of the rotation track of the same platform vehicle type brake pedal point as a radius, wherein an intersection point of the arc and the vertical bisector of the initial position brake pedal point (B) is the rotation center o of the brake pedal, and pushing out the rotation radius R and the rotation track L6 of a push rod MN of the booster (B) and a pedal swing arm connecting point N according to a lever ratio i;
(4) Setting the axial distance L9 between the booster (b) and the pedal bracket (c) according to the arrangement requirements of the booster (b) and the pedal bracket (c), and locking the relative positions of the booster and the pedal bracket;
(5) The connection point M of the booster (b) and the push rod MN moves along the axis L7 of the booster (b), the movement stroke is L10, a rotation track allowed section 1-2-3-4 of the connection point N of the push rod MN and the pedal swing arm (a) can be made according to the length of the push rod MN and the limit swing angle theta requirement, 1 point in the allowed section 1-2-3-4 represents the N point position of the connection point M, the movement stroke is L10, the included angle theta/2 between the MN and the axis L7 is formed, and the movement stroke of the connection point M is L10 and represents the limit position; 2 points represent N points of the joint M with the motion strokes of L10 and MN and the included angle-theta/2 between the axis L7; the 3 point represents the N point position of the joint M with the motion stroke of 0 and the included angle theta/2 between the MN and the axis L7, wherein the joint M with the motion stroke of 0 represents the initial position; 4 points represent N points of the connecting point M with the motion stroke of 0 and the included angle-theta/2 between the MN and the axis L7;
(6) The arrangement positions of the booster (b) and the pedal bracket (c) are adjusted, so that the brake pedal bracket (c) can design a pedal rotation center structure (d), and meanwhile, the stroke rotation track L6 of the connection point N of the push rod MN and the pedal swing arm (a) is required to be located in an allowed section 1-2-3-4.
3. An ergonomic brake pedal trajectory placement method as recited in claim 2, wherein: if the arrangement position scheme of the booster (b) and the pedal bracket (c) can not meet the requirement, the arc radius of the rotation track of the brake pedal point is adjusted, and the arrangement method is repeated.
4. An ergonomic brake pedal trajectory placement method as recited in claim 3, wherein: if the radius of the circular arc of the rotation track of the brake pedal point is not feasible, the chord angle of the rotation track of the brake pedal is adjusted, and the arrangement method is repeated until all the arrangement requirements are met.
5. The ergonomic brake pedal trajectory placement method of claim 4, wherein: the specific method for adjusting the chord angle of the rotation track of the brake pedal comprises the following steps: and adjusting the initial rotation track chord angle of the brake pedal point (B) at the initial position in the allowable section of the brake pedal rotation track chord.
6. The ergonomic brake pedal trajectory placement method of claim 5, wherein: the allowable section of the initial rotation track chord of the initial position brake pedal point (B) is the included angle area of line segments L2 and L3.
7. An ergonomic brake pedal trajectory placement method as recited in claim 2, wherein: the lengths of L0, L2 and L3 are all 80mm.
8. An ergonomic brake pedal trajectory placement method as claimed in claim 1 or 2, characterized by: the initial position accelerator pedal point (A) is a point of a distance of 200mm from the heel of the foot.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210891605.9A CN115339424B (en) | 2022-07-27 | 2022-07-27 | Ergonomic brake pedal track arrangement method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210891605.9A CN115339424B (en) | 2022-07-27 | 2022-07-27 | Ergonomic brake pedal track arrangement method |
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| CN115339424A CN115339424A (en) | 2022-11-15 |
| CN115339424B true CN115339424B (en) | 2024-01-16 |
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| 乘用车制动踏板设计布置;韩厚禄;汽车工艺师(第8期);第58-61页 * |
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