Electromagnetic pedal feeling feedback device

Abstract

The utility model discloses an electromagnetic pedal sensing feedback device which comprises a brake pedal, the brake pedal is connected with a push rod in the inclined direction, the push rod extends into a sealed shell and is connected with a magnetic block, the side, away from the push rod, of the magnetic block is connected with a spring, and an iron core is further arranged in the sealed shell. Along with inclination of the brake pedal, the push rod is pushed to move towards the interior of the sealing shell, and the magnetic block gets close to the iron core. The magnetic block gradually gets close to the iron core, at the moment, the power supply controls the current in the coil according to the displacement signal through the MCU, due to the change of the current in the coil, the magnetism generated by the iron core coil device continuously changes, and the magnetism of the section, close to the magnetic block, of the iron core is opposite, so that when the magnetic block continuously gets close to the iron core coil device, the magnetic block does not get close to the coil. The magnetic counterforce is gradually increased, so that the magnitude of the magnetic force can be adjusted in real time by controlling the magnitude of the energized current in the coil, thereby providing pedal sense feedback with different strengths for a driver, and ensuring the safety of traveling brake.

Description

TECHNICAL FIELD

[0001] The utility model relates to an electromagnetic pedal feeling feedback device. BACKGROUND

[0002] The current automobile technology development trend shows that intelligent driving and intelligent chassis integration will significantly improve the L3 above vehicle motion control performance, and the drive-by-wire system is the support base of the intelligent chassis. The drive-by-wire brake system can be divided into two categories of electronic hydraulic brake system (EHB) and electronic mechanical brake system (EMB), and the current automatic emergency brake system of advanced auxiliary driving system and adaptive cruise control system ACC must adopt the drive-by-wire brake system to realize it. In the human-machine co-driving control mode, the driver takes over the control of the car and implements the brake operation, and the physical inertia perception of the car control is realized by the electronic system pedal simulator.

[0003] The pedal feeling is crucial for the driver to control the road feeling feedback and control response of the car, and is the key assembly system for taking over the control of the car for safe driving. At present, the driver's brake pedal feeling in the drive-by-wire brake system cannot be fed back in time. UTILITY MODEL CONTENT

[0004] The utility model aims at providing an electromagnetic pedal feeling feedback device to solve the problems in the above background technology.

[0005] In order to realize the above-mentioned purpose, the utility model provides the following technical scheme: an electromagnetic pedal feeling feedback device, comprising a brake pedal, the brake pedal is connected with a push rod in the inclined direction, the push rod extends into a sealed shell and is connected with a magnetic block, the magnetic block is connected with a spring away from the push rod, and an iron core is further arranged in the sealed shell.

[0006] Among them, with the inclination of the brake pedal, the push rod is pushed to move towards the sealed shell, and the magnetic block is close to the iron core.

[0007] Preferably, a blocking block is arranged centrally in the sealed shell, so that a first cavity and a second cavity are formed in the sealed shell by the blocking block.

[0008] Preferably, the spring is installed in the first cavity, and the iron core is installed in the second cavity.

[0009] Preferably, the iron core is fixed by a buckle, and a coil is arranged around the outer side of the iron core.

[0010] Preferably, the two ends of the coil are respectively connected with the positive and negative poles of a power supply, and the power output end of the power supply is further connected with a central controller.

[0011] Preferably, the central controller control output end is connected with a stroke sensor, and the stroke sensor is arranged vertically below the moving path of the push rod.

[0012] The technical effects and advantages of this utility model are as follows: When the brake pedal is pressed, the push rod compresses the spring forward. During the movement of the push rod, the displacement sensor detects the displacement signal in real time and transmits the signal to the MCU. As the spring is compressed, the magnetic block gradually approaches the iron core. At this time, the power supply in the MCU controls the current in the coil according to the displacement signal. Due to the change in the current in the coil, the magnetism generated by the iron core coil device changes continuously. The magnetism of the section of the iron core that is close to the magnetic block is opposite. Therefore, as the magnetic block gets closer to the iron core coil device, the magnetic reaction force it experiences gradually increases. Thus, by controlling the magnitude of the current in the coil, the magnitude of the magnetic force can be adjusted in real time, thereby providing the driver with pedal feedback of different intensities and ensuring driving braking safety. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0014] In the diagram: 1. Brake pedal; 2. Push rod; 3. Travel sensor; 4. Magnetic block; 5. Sealed housing; 6. Spring; 7. Block; 8. Iron core; 9. Coil; 10. Buckle; 11. Power supply; 12. Central processing unit. Detailed Implementation

[0015] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0016] To provide different levels of pedal feel feedback, refer to Figure 1 As shown, it includes a brake pedal 1, a push rod 2 connected to the brake pedal 1 in an inclined direction, the push rod 2 extends into the sealed housing 5 and is connected to a magnetic block 4, a spring 6 is connected to the side of the magnetic block 4 away from the push rod 2, and an iron core 8 is also provided inside the sealed housing 5.

[0017] As the brake pedal 1 is tilted, the push rod 2 moves towards the sealed housing 5, bringing the magnetic block 4 closer to the iron core 8. When the brake pedal 1 is pressed, the push rod 2 compresses the spring 6 forward. During the movement of the push rod 2, the displacement sensor detects the displacement signal in real time and transmits the signal to the MCU. As the spring 6 is compressed, the magnetic block 4 gradually approaches the iron core 8. At this time, the power supply 11 controls the current in the coil 9 according to the displacement signal in the MCU. Due to the change in the current in the coil 9, the magnetism generated by the iron core 8 and the coil 9 device is constantly changing. The magnetism of the section of the iron core 8 that is close to the magnetic block 4 is opposite. Therefore, as the magnetic block 4 gets closer to the iron core 8 and the coil 9 device, the magnetic reaction force it experiences gradually increases. Therefore, by controlling the magnitude of the current in the coil 9, the magnitude of the magnetic force can be adjusted in real time, thereby providing the driver with different intensities of pedal feel feedback.

[0018] To adjust the magnitude of the magnetic force in real time, refer to Figure 1 As shown, a blocking block 7 is centrally located within the sealed housing, forming a first cavity and a second cavity within the housing. These independent cavities isolate the magnetic block 4 and the iron core 8. The spring 6 is installed in the first cavity, and the iron core 8 is installed in the second cavity. The iron core 8 is fixed by a snap fastener 10, and a coil 9 surrounds the outer edge of the iron core 8. Other fixing devices can be used to fix the iron core 8, but snap fastener 10 is preferred. The current in the coil 9 is controlled by the power supply 11 under the influence of a displacement signal from the MCU. The magnetism generated by the coil 9 changes continuously due to the change in current. The two ends of the coil 9 are connected to the positive and negative terminals of the power supply 11. The power output of the power supply 11 is also connected to a central controller 12 (MCU). The output of the central controller 12 is connected to a stroke sensor 3, which is positioned vertically below the movement path of the push rod 2. The displacement sensor detects the displacement signal of the push rod 2 in real time and transmits the signal to the MCU.

[0019] Furthermore, before deriving the parameter calculations during normal system operation, the parameters within the system are first described: the force applied by the driver to the brake pedal 1 is F, the stiffness of spring 66 is k, the magnetic moment of magnetic block 44 is M2, the radius of coil 9 in iron core 8 is r, the number of turns of coil 9 is n, the distance between coil 9 in iron core 8 and magnetic block 44 is s, and the current flowing through coil 9 is i. During normal system operation, according to the right-hand screw rule, the right side of coil 9 in iron core 8 is N, therefore the left side of magnetic block 44 is also N. Magnetic block 44 gradually approaches coil 9 in iron core 8 under the push of push rod 2. At this point, because their magnetic poles are the same, they repel each other. The calculation process of the force balance equation within the system is as follows:

[0020] Let the compressed stroke of spring 6 be s1 (s1≤s). What is the force generated at point 6 at this point?

[0021] F1=K*s1 (1)

[0022] At this moment, the current in coil 9 is i1 (i1≤i), then the magnetic moment m2 of coil 9 is:

[0023] m2=N*i1*π*r 2 (2)

[0024] Therefore, the magnitude of the force F2 exerted by coil 9 on magnet 4 at this time is:

[0025] F2=T*(m1*m2) / (s-s1) 2 (3)

[0026] In Equation 3, T is a constant, which can be derived from the magnetic field strength of the actual magnetic block 4, and m1 is the magnetic moment of the magnetic block 4.

[0027] According to equation 1-3, the force balance equation within the system can be derived as follows:

[0028] F = F1 + F2

[0029] In the balance equation, as s1 increases, F1 also increases. Simultaneously, by controlling and increasing the current i1, F2 gradually increases, thus F gradually increases, providing pedal force feedback to the driver. Compared to traditional braking system pedal feedback devices, this device has a simpler structure and eliminates the need for a hydraulic circuit, making it ideal for EMB systems. By controlling the current within coil 9, the magnitude of the magnetic force can be controlled, achieving stepless pedal force feedback and thus meeting personalized user needs.

[0030] In use, the driver first presses the brake pedal 1, and the push rod 2 compresses the spring 6 forward. During the movement of the push rod 2, the displacement sensor detects the displacement signal in real time and transmits the signal to the MCU. As the spring 6 is compressed, the magnetic block 4 gradually approaches the iron core 8. At this time, the power supply 11 controls the current in the coil 9 according to the displacement signal in the MCU. Due to the change in the current in the coil 9, the magnetism generated by the iron core 8 and the coil 9 device is constantly changing. The magnetism of the section of the iron core 8 that is close to the magnetic block 4 is opposite. Therefore, as the magnetic block 4 approaches the iron core 8 and the coil 9 device, the magnetic reaction force it experiences gradually increases. Therefore, by controlling the magnitude of the current flowing through the coil 9, the magnitude of the magnetic force can be adjusted in real time.

[0031] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model.

Claims

1. An electromagnetic pedal feedback device, characterized in that, The device includes a brake pedal (1), a push rod (2) connected to the brake pedal (1) in an inclined direction, the push rod (2) extending into the sealed housing (5) and connected to a magnetic block (4), a spring (6) connected to the side of the magnetic block (4) away from the push rod (2), an iron core (8) is also provided inside the sealed housing (5), a coil (9) is surrounded around the outside of the iron core (8), the two ends of the coil (9) are respectively connected to the positive and negative poles of a power supply (11), the power output terminal of the power supply (11) is also connected to a central controller, the control output terminal of the central controller is connected to a stroke sensor (3), the stroke sensor (3) is set vertically below the movement path of the push rod (2); wherein, as the brake pedal (1) tilts, it pushes the push rod (2) to move toward the sealed housing (5), so that the magnetic block (4) is close to the iron core (8).

2. The electromagnetic pedal feedback device according to claim 1, characterized in that: A barrier block (7) is centrally located inside the sealed housing (5), which forms a first cavity and a second cavity inside the sealed housing.

3. The electromagnetic pedal feedback device according to claim 2, characterized in that: The spring (6) is installed in the first cavity, and the iron core (8) is installed in the second cavity.

4. The electromagnetic pedal feedback device according to claim 1, characterized in that: The iron core (8) is fixed by a buckle (10).

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