Drive-by-wire electronic brake pedal with hysteresis effect

Abstract

The invention discloses a drive-by-wire electronic brake pedal with a hysteresis effect. The drive-by-wire electronic brake pedal comprises a base, a pedal connecting rod, a rotating shaft, a hysteresis mechanism and a signal sensing unit. The pedal connecting rod is rotationally connected with the base through a rotating shaft. The delaying mechanism is arranged between the base and the pedal connecting rod and comprises a supporting rotating shaft, a spring sliding block, a first supporting sliding block, a second supporting sliding block, a first elastic element and a second elastic element. The signal induction unit is used for transmitting a rotation angle signal of the brake pedal into an electric signal and outputting the electric signal to the control unit for brake control. The pedal is provided with the delaying mechanism, and when the pedal works, the delaying mechanism generates a delaying effect, so that a driver can well control the position of the pedal, an electric signal is stably output, the driving comfort is improved, and the fatigue feeling of the feet of the driver is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic pedals, and in particular to a wire-controlled electronic brake pedal with a hysteresis effect. Background Art

[0002] The traditional braking system mainly relies on the driver to input the driving intention by stepping on the brake pedal, and the engine generates a vacuum to generate power, and finally the hydraulic system provides power to generate braking. With the development of electric and intelligent vehicles, compared with the traditional braking system, the mechanical wire control brake system eliminates the vacuum booster and hydraulic system, saves installation and space layout, and reduces the weight of the whole vehicle.

[0003] CN 118850028 A, CN 220639794 U and CN101559760A all disclose an electronic brake pedal for brake-by-wire. The brake pedals of the above patents do not have a hysteresis effect. When the road is uneven or the pressure applied to the pedal is not stable, the electrical signal will be unstable, making it easy for the pedal surface to hit the foot. In addition, since the driver needs to use a lot of force to maintain the position of the pedal, it is easy to get tired after long-term driving, and the driving comfort is poor. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a wire-controlled electronic brake pedal with hysteresis effect.

[0005] The technical solution adopted by the present invention is:

[0006] A wire-controlled electronic brake pedal with a hysteresis effect comprises a base, a pedal connecting rod, a rotating shaft, a hysteresis mechanism and a signal sensing unit; the pedal connecting rod and the base are rotatably connected via the rotating shaft.

[0007] The hysteresis mechanism is arranged between the base and the pedal connecting rod, and includes a supporting shaft, a spring slider, a first supporting slider, a second supporting slider, a first elastic element and a second elastic element; the supporting shaft is rotatably connected to the base, the spring slider is slidably connected to the supporting shaft, the first elastic element acts between the spring slider and the supporting shaft, the first supporting slider is rotatably connected to the pedal connecting rod and slidably connected to the supporting shaft, the second supporting slider is slidably connected to the first supporting slider via an inclined surface, the second elastic element acts between the spring slider and the second supporting slider, and the second supporting slider and the first supporting slider are both in frictional contact with the inner wall of the base.

[0008] The signal sensing unit is used to transfer the angle signal of the brake pedal rotation into an electrical signal, and output the electrical signal to the control unit for brake control.

[0009] When the driver steps on the pedal connecting rod, the pedal connecting rod rotates around the rotating shaft, and at the same time drives the rotating shaft bushing to rotate. The magnet and the electric plate installed on the rotating shaft bushing realize signal changes through rotation. These signals are output to the control unit, and the control unit realizes vehicle braking by processing the electrical signals. When the pedal is working, the pedal connecting rod rotates around the axis of the rotating shaft, driving the first supporting slider and the second supporting slider to rotate and rub on the base. The elastic element provides force to act on the supporting slider. Through the inclined surface cooperation of the first supporting slider and the second supporting slider, a component force is provided to squeeze the base to generate friction, that is, damping force, and produce a hysteresis effect, so that the driver can control the pedal position well, so that the electrical signal can be output stably, the driving comfort is improved, and the fatigue of the driver's feet is reduced.

[0010] Furthermore, the signal sensing unit includes a magnetic sheet, a metal sheet, a left electronic box and a right electronic box. A Hall sensor is provided in the left electronic box, and an inductor is provided in the right electronic box. The magnetic sheet and the metal sheet are fixedly connected to the rotating shaft through left and right bushings respectively. The left electronic box and the right electronic box are fixedly installed on the left and right sides of the base respectively. The magnetic sheet cooperates with the Hall sensor to generate a first electrical signal, and the metal sheet cooperates with the inductor to generate a second electrical signal. Two sets of sensing devices are respectively provided on both sides of the base. The two sets of sensing devices can play a double insurance role, improve driving safety, and meet the functional safety level D (ASIL-D) requirements.

[0011] Furthermore, the signal sensing unit includes a magnetic sheet, a metal sheet and an electronic box. The electronic box is provided with an inductor and a Hall sensor. The magnetic sheet and the metal sheet are fixedly connected to the rotating shaft through a bushing. The electronic box is fixedly mounted on one side of the base. The magnetic sheet cooperates with the Hall sensor to generate a first electrical signal, and the metal sheet cooperates with the inductor to generate a second electrical signal. The two sets of sensing devices are arranged on the same side of the base. The two sets of sensing devices can play a double insurance role, improve driving safety, and meet the functional safety level D (ASIL-D) requirements.

[0012] Furthermore, the rotating shaft is a spline shaft, the bushing and the pedal connecting rod are circumferentially fixedly connected to the rotating shaft through the spline, and the rotating shaft is axially rotatably connected to the base through the bushing, so that the synchronization and stability of the pedal and the electrical signal are better, and the wear-resistant bushing is first selected when using it, which is conducive to improving the service life of the rotating shaft.

[0013] Furthermore, the support shaft includes a cylindrical connection part, a slot connection part and a cylindrical guide part, the cylindrical connection part is located at the bottom of the support shaft and is used for rotationally connecting the base, the slot connection part is located above the cylindrical connection part and is used for slidingly engaging and connecting the spring slider and limiting the installation of the first elastic element, and the cylindrical guide part is located on one side of the slot connection part and is used for slidingly connecting the first support slider. The hysteresis mechanism has a compact structure, a small installation space and a good hysteresis effect.

[0014] Furthermore, the first supporting slider is provided with a conical slide groove with one side open, and the two side walls of the slide groove are respectively provided with a first sliding surface and a second sliding surface; the second sliding surface is located at the small end of the slide groove, and a limiting surface is provided on the outer side thereof; the second supporting slider is provided with a conical sliding body matched with the conical slide groove, and the two sides of the sliding body are respectively provided with a third sliding surface and a fourth sliding surface, and the sliding body of the second supporting slider is slidably inserted into the slide groove of the first supporting slider, and the first sliding surface is slidably matched with the third sliding surface, and the second sliding surface is slidably matched with the fourth sliding surface. The hysteresis mechanism has a compact structure, a small installation space, and a good hysteresis effect.

[0015] Furthermore, a first protrusion is provided on the side of the first supporting slider, and the first protrusion is away from the open end of the slide slot; a second protrusion is provided on the side of the second supporting slider, and the first protrusion and the second protrusion are in frictional contact with the two inner side walls of the base respectively. The hysteresis mechanism has a compact structure, a small installation space, and a good hysteresis effect.

[0016] Furthermore, the first supporting slider and the second supporting slider are both made of POM material by one-step injection molding, which has simple process, better wear resistance and lighter weight.

[0017] Furthermore, the second elastic element is a nonlinear elastic element. It is further preferred that the nonlinear elastic body is a tower spring or a disc spring or a variable pitch compression coil spring, which is more conducive to matching the force requirements of the brake pedal.

[0018] Furthermore, the rotating shaft is a metal shaft, which has high strength, is not easy to wear, and transmits electrical signals more stably.

[0019] Beneficial effects of the present invention:

[0020] 1. The present invention is provided with a hysteresis mechanism. When the pedal is working, the pedal connecting rod rotates around the axis of the rotating shaft, driving the first supporting slider and the second supporting slider to rotate and rub on the base. The elastic element provides a force to act on the supporting slider. Through the cooperation of the inclined surfaces of the first supporting slider and the second supporting slider, a component force is provided to squeeze the base to generate friction, that is, damping force, and produce a hysteresis effect, so that the driver can control the pedal position well, so that the electrical signal can be output stably, the driving comfort is improved, and the fatigue of the driver's feet is reduced.

[0021] 2. The damping force can be adjusted by adjusting the matching angle of the inclined surfaces of the first supporting slider and the second supporting slider, thereby achieving customized requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is an assembly diagram of the wire-controlled electronic brake pedal of the present invention.

[0023] Figure 2 This is an exploded view of the wire-controlled electronic brake pedal of Example 1.

[0024] Figure 3This is an exploded view of the wire-controlled electronic brake pedal of Example 2.

[0025] Figure 4 This is the structural diagram of the hysteresis mechanism.

[0026] Figure 5 This is a structural diagram of the supporting shaft.

[0027] Figure 6 The first supporting slider structure Figure 1 .

[0028] Figure 7 The first supporting slider structure Figure 2 .

[0029] Figure 8 This is a structural diagram of the second supporting slider.

[0030] Fig. 9 The figure is a simplified diagram of the mechanical model of the wire-controlled electronic brake pedal of the present invention. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the present invention more clear, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and preferred implementation modes.

[0032] by Figure 1 For example, the end of the pedal connecting rod 2 connected to the base 1 is the front end of the present invention, and the end where the pedal is set is the rear end. Figure 2 For example, the side where the left electronic box 15 is installed is the left side described in the present invention, and the side where the right electronic box 9 is installed is the right side.

[0033] Example 1

[0034] See also Figure 1 and Figure 2 The present embodiment provides a wire-controlled electronic brake pedal with a hysteresis effect, including a base 1, a pedal connecting rod 2, a rotating shaft 3, a right bushing 12, a left bushing 13, a hysteresis mechanism 30 and a signal sensing unit 40.

[0035] The base 1 is provided with an inner cavity for accommodating the pedal link 2, the rear side of the cavity is open, and the left and right side walls of the cavity are provided with a shaft mounting hole A, which is a light hole; the bottom of the cavity is provided with a semicircular hole for connecting the hysteresis mechanism. One end of the pedal link 2 is provided with a shaft mounting hole B, which is an axial hole with a keyway, and the other end of the pedal link 2 is provided with a pedal, and the bottom of the pedal link 2 is provided with a semicircular hole for connecting the hysteresis mechanism. The shaft 3 is a spline shaft, and the right bushing 12 and the left bushing 13 are provided with shaft holes with keyways. The shaft 3 is axially fixedly connected with the pedal link 2, the right bushing 12 and the left bushing 13 through splines.

[0036] During installation, firstly, the right bushing 12 and the left bushing 13 are rotatably installed in the rotating shaft installation hole A on the base 1, and then one end of the pedal connecting rod 2 provided with the rotating shaft installation hole B is inserted into the inner cavity of the base 1 from the base opening end, and finally the rotating shaft 3 passes through the left bushing 13, the pedal connecting rod 2 and the right bushing 12 in sequence. Alternatively, the pedal connecting rod may be placed in the base first, and then the rotating shaft is installed, and then the left and right bushings are installed, the base 1 and the rotating shaft 3 are circumferentially rotatably connected through the right bushing 12 and the left bushing 13, and the pedal connecting rod 2 and the rotating shaft 3 are circumferentially fixedly connected through the spline. Stepping on the pedal connecting rod 2 drives the rotating shaft 3 to rotate around the axis of the rotating shaft 3 in the base 1.

[0037] The signal sensing unit 40 includes a right electronic box 9, a metal sheet 11, a magnetic sheet 14 and a left electronic box 15. The left electronic box 15 and the right electronic box 9 both include a box body and a box cover. The box body of the left electronic box 15 is provided with a Hall sensor, a circuit board and a connector. The box body of the right electronic box 9 is provided with an inductor, a circuit board and a connector. The magnetic sheet 14 and the metal sheet 11 are fixedly mounted on the left bushing 13 and the right bushing 12 respectively. The left electronic box 15 is fixed to the left side of the base 1 by screws, and the right electronic box 9 is fixed to the right side of the base 1 by screws 10. When the pedal connecting rod 2 is stepped on, the rotating shaft 3 drives the magnetic sheet 14 and the metal sheet 11 to rotate. The Hall sensor and the inductor change the output electrical signal accordingly according to the change of the pedal angle displacement. The electrical signal is transmitted to the control unit through the connector of the electronic box, and the control unit controls to realize the braking.

[0038] See also Figure 2 and Figure 4 The hysteresis mechanism 30 includes a first support slider 4, a second support slider 5, a spring slider 6, a support shaft 7 and an elastic element 8. The elastic element 8 includes a first elastic element 81 and a second elastic element 82; preferably, the first elastic element 81 is an equal pitch compression coil spring, and the second elastic element 82 is a variable pitch compression coil spring. The variable pitch compression coil spring is a nonlinear elastic element, which is more conducive to matching the force requirements of the brake pedal.

[0039] The side wall of the spring slider 6 is provided with a buckle, and the top surface and the bottom surface of the spring slider 6 are respectively provided with a spring mounting portion for supporting the first elastic element and the second supporting element.

[0040] See also Figure 5 The support shaft 7 includes a cylindrical connection part 71, a slot connection part 72 and a cylindrical guide part 73. The slot connection part 72 is provided with a slot body for accommodating the first elastic element 81 and the spring slider 6, the bottom of the slot body is provided with a cylindrical part 721 for limiting the support elastic element, and the inner side wall of the slot body is provided with a bayonet 722 for slidingly connecting the spring slider 6. The cylindrical connection part 71 is transversely arranged at the bottom of the slot connection part 72, and the cylindrical guide part 73 is vertically arranged at the rear side of the slot connection part 72, and the cylindrical guide part 73 is perpendicular to the axis of the cylindrical connection part 71.

[0041] See also Figure 6 and Figure 7 The first supporting slider 4 is provided with a slide groove 41 with an open bottom surface and right side surface, and the width of the slide groove gradually decreases from left to right. A first protrusion 43 is provided on the left side of the slide groove, and a guide column connecting part 42 is provided on the rear side of the slide groove. A waist-shaped through hole is provided in the guide column connecting part 42 for sliding connection with the cylindrical guide part 73 of the supporting shaft 7; two first sliding surfaces 45 and two second sliding surfaces 44 are provided on the left and right side walls of the slide groove respectively, and the first sliding surface 45 is located at the small end of the slide groove and a blocking surface is provided on the outer side thereof. The first sliding surface 45 is parallel to the second sliding surface 44 and is lower than the second sliding surface 44. A semi-cylindrical connecting part 46 for connecting the pedal connecting rod 2 is provided laterally on the top surface of the first supporting slider 4.

[0042] See also Figure 7 The second supporting slider 5 is provided with a sliding body 51 whose width gradually increases from left to right, a second convex block 53 is provided on the right side of the sliding body, an opening groove 52 for accommodating the second elastic element 82 is provided at the bottom of the sliding body, and a spring mounting portion for supporting the second elastic element is provided in the opening groove 52; an arc-shaped opening for avoiding the cylindrical guide portion 73 of the supporting shaft 7 is provided on the rear side of the sliding body. Two third sliding surfaces 54 and two fourth sliding surfaces 55 are provided on the front and rear sides of the sliding body respectively. The third sliding surface 54 is slidably matched with the first sliding surface 44, and the fourth sliding surface 55 is slidably matched with the second sliding surface 45.

[0043] The plurality of sliding surfaces can increase the contact area between the second supporting slider 5 and the first supporting slider 4 , thereby improving the effect of the second supporting slider 5 and the first supporting slider 4 squeezing the side wall of the base to generate the damping force.

[0044] See also Figure 1 and Figure 4 , when the hysteresis mechanism 30 is assembled and installed;

[0045] First, the first elastic element 81 is supported on the cylindrical portion 721 of the support shaft 7, and then the lower end of the spring slider 6 is slidably inserted into the slot body of the support shaft slot connection portion 72. The spring slider 6 is provided with a buckle, which cooperates with the bayonet 722 of the support shaft 7 to limit the spring slider 6 in the slot body. The spring slider 6 slides up and down in the slot body under the action of the first elastic element 81. The lower end of the first elastic element 81 is supported on the inner bottom surface of the support shaft slot body, and the upper end is supported on the spring mounting portion of the spring slider 6.

[0046] Next, install the second elastic element 82 on the spring mounting portion at the top of the spring slider 6, insert the second support slider 5 into the slide groove of the first support slider 4, and then slide the first support slider 4 onto the cylindrical guide portion 73 of the support shaft 7 through the through hole provided in the guide column connecting portion 42 thereof, so that one end of the second elastic element 82 is supported on the spring mounting portion of the spring slider 6, and the other end is supported on the spring mounting portion of the second support slider 5.

[0047] Finally, install the assembled hysteresis mechanism 30 between the base 1 and the pedal connecting rod 2, so that the cylindrical connecting portion 71 of the supporting shaft 7 is inserted into the semicircular hole of the base 1, and the semi-cylindrical connecting portion 46 of the first supporting slider 4 is inserted into the semicircular hole of the pedal connecting rod 2. The first elastic element 81 and the second elastic element 82 are in a free extension state, the first protrusion 43 of the first supporting slider 4 contacts the left inner wall of the base, and the second protrusion 53 of the second supporting slider 5 contacts the right inner wall of the base.

[0048] When the pedal link 2 is stepped on, the pedal link 2 drives the first support slider 4 and the second support slider 54 to rotate and slide to the left and right sides. At the same time, the elastic element 8 is compressed, and the spring force acts on the base 1 through the inclined sliding of the first support slider 4 and the second support slider 54. The first protrusion 43 and the second protrusion 53 respectively squeeze the two inner side walls of the base to generate damping force. The force value curve is shown in FIG. Fig. 9 shown.

[0049] Example 2

[0050] See also Figure 3 , Figure 3 The same components as those in Example 1 are marked with the same reference numerals.

[0051] Embodiment 2 is basically the same as Embodiment 1, except that the signal sensing unit 40 includes a right electronic box, a magnetic sheet 14, a metal sheet 11 and a retaining spring 16. The right electronic box includes a box body 91 and a box cover 93. The box body 91 is provided with a Hall sensor, an inductor, a circuit board 92 and a connector. The magnetic sheet 14 and the metal sheet 11 are fixedly mounted on the right bushing 12. The end of the rotating shaft extending out of the left bushing 13 is locked by the retaining spring 16. The right electronic box is fixed to the right side of the base 1 by a screw 10.

[0052] When the pedal connecting rod 2 is stepped on, the rotating shaft 3 drives the magnetic sheet 14 and the metal sheet 11 to rotate. The Hall sensor and the inductor coil change the output electrical signal accordingly according to the change of the pedal angle displacement. The electrical signal is transmitted to the control unit through the connector of the right electronic box, and the control unit controls to realize braking.

[0053] The structure and working principle of the hysteresis mechanism of Example 2 are the same as those of Example 1, and will not be described in detail here.

[0054] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications are also within the protection scope of the present invention.

Claims

1. A wire-controlled electronic brake pedal with hysteresis effect, characterized in that: It comprises a base (1), a pedal connecting rod (2), a rotating shaft (3), a hysteresis mechanism and a signal sensing unit; The pedal connecting rod (2) is rotatably connected to the base (1) via a rotating shaft (3); The hysteresis mechanism is arranged between the base (1) and the pedal connecting rod (2), and comprises a supporting shaft (7), a spring slider (6), a first supporting slider (4), a second supporting slider (5), a first elastic element (81) and a second elastic element (82); the supporting shaft (7) is rotatably connected to the base (1), the spring slider (6) is slidably connected to the supporting shaft (7), the first elastic element (81) acts between the spring slider (6) and the supporting shaft (7), the first supporting slider (4) is rotatably connected to the pedal connecting rod (2) and is slidably connected to the supporting shaft (7), the second supporting slider (5) is slidably connected to the first supporting slider (4) via an inclined surface, the second elastic element (82) acts between the spring slider (6) and the second supporting slider (5), and the second supporting slider (5) and the first supporting slider (4) are both in frictional contact with the inner side wall of the base (1); The signal sensing unit is used to transfer the angle signal of the brake pedal rotation into an electrical signal, and output the electrical signal to the control unit for brake control.

2. The wire-controlled electronic brake pedal with hysteresis effect according to claim 1, characterized in that: The signal sensing unit comprises a magnetic sheet (14), a metal sheet (11), a left electronic box (15) and a right electronic box (9); a Hall sensor is arranged in the left electronic box (15), an inductor is arranged in the right electronic box (9); the magnetic sheet (14) and the metal sheet (11) are fixedly connected to the rotating shaft (3) through left and right bushings respectively; the left electronic box (15) and the right electronic box (9) are fixedly mounted on the left and right sides of the base (1) respectively; the magnetic sheet (14) cooperates with the Hall sensor to generate a first electrical signal; and the metal sheet (11) cooperates with the inductor to generate a second electronic signal.

3. The wire-controlled electronic brake pedal with hysteresis effect according to claim 1, characterized in that: The signal sensing unit comprises a magnetic sheet (13), a metal sheet (11) and an electronic box (9); an inductor coil and a Hall sensor are arranged in the electronic box (9); the magnetic sheet (14) and the metal sheet (11) are fixedly connected to the rotating shaft (3) via a bushing; the electronic box (9) is fixedly mounted on one side of the base (1); the magnetic sheet (14) cooperates with the Hall sensor to generate a first electrical signal; and the metal sheet (11) cooperates with the inductor coil to generate a second electronic signal.

4. A wire-controlled electronic brake pedal with hysteresis effect according to claim 2 or 3, characterized in that: The rotating shaft (3) is a spline shaft, the bushing and the pedal connecting rod (2) are circumferentially fixedly connected to the rotating shaft (3) through the spline, and the rotating shaft (3) is circumferentially rotatably connected to the base (1) through the bushing.

5. The wire-controlled electronic brake pedal with hysteresis effect according to claim 1, characterized in that: The support shaft (7) comprises a cylindrical connection part, a slot connection part and a cylindrical guide part. The cylindrical connection part is located at the bottom of the support shaft (7) and is used for rotationally connecting the base (1). The slot connection part is located above the cylindrical connection part and is used for slidably engaging and connecting the spring slider (6) and limiting the installation of the first elastic element (81). The cylindrical guide part is located on one side of the slot connection part and is used for slidably connecting the first support slider (4).

6. The wire-controlled electronic brake pedal with hysteresis effect according to claim 1, characterized in that: The first supporting slider (4) is provided with a conical slide groove with an open side, and the two side walls of the slide groove are respectively provided with a first sliding surface and a second sliding surface; the second sliding surface is located at the small end of the slide groove, and a limiting surface is provided on the outer side thereof; the second supporting slider (5) is provided with a conical sliding body that cooperates with the conical slide groove, and the two sides of the sliding body are respectively provided with a third sliding surface and a fourth sliding surface, and the sliding body of the second supporting slider (5) is slidably inserted into the slide groove of the first supporting slider (4), and the first sliding surface is slidably matched with the third sliding surface, and the second sliding surface is slidably matched with the fourth sliding surface.

7. The wire-controlled electronic brake pedal with hysteresis effect according to claim 6, characterized in that: A first protrusion is provided on the side of the first supporting slider (4), and the first protrusion is away from the open end of the slide groove; a second protrusion is provided on the side of the second supporting slider (5), and the first protrusion and the second protrusion are in frictional contact with the two inner side walls of the base (1) respectively.

8. The wire-controlled electronic brake pedal with hysteresis effect according to claim 7, characterized in that: The first supporting slider (4) and the second supporting slider (5) are both made of POM material by one-step injection molding.

9. The wire-controlled electronic brake pedal with hysteresis effect according to claim 1, characterized in that: The second elastic element (82) is a nonlinear elastic element.

10. The wire-controlled electronic brake pedal with hysteresis effect according to claim 1, characterized in that: The rotating shaft (3) is a metal shaft.

Images