Travel awareness system with real-time check and safety redundancy

Abstract

A travel sensing system for real-time verification and safety redundancy comprises a double-magnet triggering mechanism connected with a brake pedal through a linkage mechanism and a double-independent magnetic induction channel sensing unit arranged outside the double-magnet triggering mechanism. Wherein the linkage mechanism drives the double-magnet triggering mechanism and the double-independent magnetic induction channel sensing unit to generate relative displacement according to the rotation of the brake pedal; the double-independent magnetic induction channel sensing unit achieves real-time verification of the position of a brake pedal and stroke sensing of safety redundancy by detecting changes of two superimposed magnetic fields of the double-magnet triggering mechanism. The industrial pain points of unexpected failure and low reliability of the stroke pedal signal of the electro-hydraulic drive-by-wire brake are solved, and the safety and the reliability of the drive-by-wire brake system are improved.

Description

Technical Field

[0001] The present invention relates to a technology in the field of automobile wire-controlled braking, in particular to a real-time verification and safety redundant stroke sensing system. Background Art

[0002] As vehicle chassis systems gradually develop towards electrification, intelligence, and wire control, electro-hydraulic wire-controlled brake systems and motor-mechanical wire-controlled brake systems are also gaining more and more attention. At the same time, the brake system is required to have high precision, high safety, and high reliability, among which the most critical control link is the travel perception of the brake pedal. The existing vehicle wire-controlled electro-hydraulic composite brake technology has a relatively complex structure, the pedal assembly is large in size, and the reliability is difficult to meet industrial needs. Summary of the invention

[0003] In view of the above-mentioned deficiencies in the prior art, the present invention proposes a stroke sensing system with real-time verification and safety redundancy, which adopts dual cylindrical magnets and dual independent magnetic sensing channel identification, not only can online real-time verification and safety redundancy be achieved, but also the circular symmetry of the magnets can eliminate the circumferential limit structure, thereby solving the industry pain points of unexpected failure of the stroke pedal signal of the electro-hydraulic brake by wire and low reliability, and improving the safety and reliability of the brake by wire system.

[0004] The present invention is achieved through the following technical solutions:

[0005] The present invention relates to a real-time verification and safety redundant stroke sensing system, comprising: a double magnet trigger mechanism connected to a brake pedal via a linkage mechanism and a double independent magnetic channel sensing unit arranged outside the double magnet trigger mechanism, wherein: the linkage mechanism drives the double magnet trigger mechanism and the double independent magnetic channel sensing unit to perform relative displacement according to the rotation of the brake pedal, and the double independent magnetic channel sensing unit realizes real-time verification of the brake pedal position and safety redundant stroke sensing by detecting changes in the two superimposed magnetic fields of the double magnet trigger mechanism.

[0006] The linkage mechanism comprises: a buckle connected to the brake pedal, and a pedal push rod with two ends respectively connected to the buckle and the double magnet trigger mechanism.

[0007] The dual-magnet trigger mechanism comprises: a rear piston and two magnet units sequentially arranged inside the rear piston, wherein: the two magnet units are connected with the same magnetic poles opposite to each other and connected by high-strength AB structural glue.

[0008] The dual magnetic channel sensing unit comprises: a valve body and two sets of independent electromagnetic sensing chips and control modules arranged thereon, and operates in a master-slave architecture mode. Technical Effects

[0009] The present invention uses a dual-magnet trigger mechanism and two sets of independent electromagnetic sensor chips and control modules, which can not only realize online real-time verification and safety redundancy, but also configure the magnets to be circularly symmetrical to eliminate the circumferential limit structure, thereby solving the industry pain points of unexpected failure of the travel pedal signal of the electro-hydraulic wire-controlled brake and low reliability, and improving the safety and reliability of the wire-controlled brake system. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a two-dimensional cross-sectional schematic diagram of the present invention;

[0011] Figure 2 It is a schematic diagram of the assembly of the three-dimensional structure of the present invention;

[0012] Figure 3 It is a schematic diagram of the housing and the integrated circuit board of the present invention;

[0013] Figure 4 It is a schematic diagram of the magnet sleeve of the present invention;

[0014] Figure 5 It is a schematic diagram of the first and second cylindrical magnet sleeves of the present invention;

[0015] Figure 6 It is a schematic diagram of the rear piston of the present invention;

[0016] Figure 7 It is a schematic diagram of the push rod seat of the present invention;

[0017] Figure 8 This is a schematic diagram of a pedal push rod of the present invention;

[0018] Fig. 9 It is a schematic diagram of the rear piston of the present invention;

[0019] Fig.10 It is a schematic diagram of the partition and the bottom plate of the present invention;

[0020] Fig.11 This is a schematic diagram of the valve block of the present invention;

[0021] Fig.12 It is a schematic diagram of the process of the present invention;

[0022] Fig.13 It is a schematic diagram of the effect of the embodiment;

[0023] In the figure: 1 housing, 2 integrated circuit board, 3 first coil, 4 current amplifier, 5 digital-to-analog converter, 6 terminal, 7 dual-channel magnetic induction device, 8 microprocessor, 9 second coil, 10 buckle, 11 pedal push rod, 12 rear piston, 13 push rod seat, 14 bottom plate, 15 second cylindrical magnet, 16 partition, 17 first cylindrical magnet, 18 magnet sleeve, 19 valve body. DETAILED DESCRIPTION

[0024] like Figure 1 As shown, this embodiment involves a real-time verification and safety redundant stroke sensing system, including: a dual magnet trigger mechanism connected to the brake pedal through a linkage mechanism and a dual independent magnetic channel sensing unit arranged outside the dual magnet trigger mechanism, wherein: the linkage mechanism drives the dual magnet trigger mechanism and the dual independent magnetic channel sensing unit to cause relative displacement according to the rotation of the brake pedal, and the dual independent magnetic channel sensing unit realizes real-time verification of the brake pedal position and safety redundant stroke sensing by detecting changes in the two superimposed magnetic fields of the dual magnet trigger mechanism.

[0025] The linkage mechanism comprises: a buckle 10 connected to the brake pedal, and a pedal push rod 11 with two ends respectively connected to the buckle 10 and the double magnet trigger mechanism, wherein: the buckle 10 converts the rotation of the brake pedal into pulling.

[0026] like Figure 1 and Fig. 9 As shown, the buckle 10 is a U-shaped structure, and is threadedly connected to the end of the pedal push rod 11 through an inner hole.

[0027] like Figure 1 and Figure 8 As shown, a ball head is provided at one end of the pedal push rod 11, and the outer surface finish is above 1.6 mm to reduce friction and ensure smooth rotation without abnormal noise.

[0028] The dual magnet trigger mechanism comprises: a rear piston 12 and two magnet units sequentially arranged inside the rear piston 12, wherein: one end of the rear piston 12 is connected to the linkage mechanism through a push rod seat 13, and the two magnet units are axially arranged sequentially at the other end of the rear piston 12.

[0029] like Figure 1 and Figure 7 As shown, the outer end of the push rod seat 13 is a bell mouth that matches the ball head of the pedal push rod 11, so that the spherical groove of the push rod seat 13 is rotatably connected to the ball head of the pedal push rod 11.

[0030] like Figure 1 and Figure 4 As shown, the two magnet units are sequentially arranged in the rear piston 12 through the magnet sleeve 18 and the partition 16. The inner hole of the rear piston 12 and the outer cylindrical surface of the magnet sleeve 18 are configured to be clearance-matched and fixedly connected after being filled with glue.

[0031] The inner hole of the rear piston 12 and the push rod seat 13 are configured to be a hole-axis interference fit, and are fixedly connected after being pressed in by an axial external force.

[0032] The dual magnetic channel sensing unit includes: a valve body 19 and two electromagnetic sensors and a control module arranged thereon, wherein: a dual magnet trigger mechanism is arranged in the valve body 19, and two electromagnetic sensors 3 and 9 are respectively arranged at both ends of the valve body 19 and are respectively connected to the control module to output sensing current. The control module realizes real-time verification of the brake pedal position and safe redundant stroke perception by comparing the magnitude of the sensing current collected at two different positions.

[0033] The electromagnetic sensor is implemented by, but not limited to, a coil.

[0034] The control module includes: an integrated circuit board 2 and a current amplifier 4, a digital-to-analog converter 5, a dual-channel magnetic induction device 7 and a microprocessor 8 arranged thereon, wherein: the dual-channel magnetic induction device 7 is connected to the current amplifier 4 and transmits current information, the current amplifier 4 is connected to the digital-to-analog converter 5 to convert the analog signal into a digital signal, and the digital-to-analog converter 5 is connected to the microprocessor 8 to transmit the digital signal to identify the distance of the pedal.

[0035] The control module is disposed on the valve body 19 as a whole through the housing 1. The housing 1 has a Z-shaped outer contour and is aligned with the Z-shaped groove disposed on the valve body 19 to prevent mis-installation in the wrong direction.

[0036] The housing 1 is provided with light holes on both sides thereof, which are fixedly connected with threaded holes provided on the valve body 19 .

[0037] The bottom surface of the housing 1 is aligned and limited with the groove step provided on the valve body 19, so that the superimposed magnetic flux passing through the first cylindrical magnet 17 and the second cylindrical magnet 15 satisfies: in: is the vacuum permeability (4π×10-7 Henry / meter), d is the pole spacing (unit: meter), r is the magnet radius (unit: meter), and M is the magnetization intensity (unit: ampere / meter).

[0038] The specific working mode of the device is as follows: when the driver steps on or releases the brake pedal, the U-shaped buckle 10 drives the pedal push rod 11 to rotate counterclockwise or clockwise relative to the valve body 19, and the pedal push rod 11 pushes and pulls the push rod seat 13, the rear piston 12 and the magnet sleeve 18 axially forward or backward; the two magnetic fields generated by the first cylindrical magnet 17 and the second cylindrical magnet 15 in the magnet sleeve 18 move in the axial direction, causing the magnetic flux of the first coil 3 and the second coil 9 of the integrated circuit board 2 to change, thereby the two coils generate regular weak current signals; the weak current signals output by the first coil 3 and the second coil 9 generate dual sine and dual cosine current signals through the current amplifier 4 and the dual-channel magnetic induction device 7, and are transmitted to the microprocessor 8, and the current signal is verified in real time through the configured algorithm, and the modulated regular current signal is output to the terminal 6.

[0039] After specific actual experiments, in the environment where the double magnets are connected to the S pole, the cylindrical magnet size is φ12mm in diameter and 12mm in length. The magnet parameters are selected as remanence Br(T): 1.23min, intrinsic coercivity HcJ(KA / m): 1353min, magnetic induction coercivity HcB(KA / m): 866min, and maximum magnetic energy product (BH)max(MG0e): 36-39. The dual independent magnetic induction chips are configured with TDK series models. The effective pedal stroke can be identified through experimental data: 0mm-30mm, which can meet the design requirements.

[0040] The above-mentioned specific implementation can be partially adjusted in different ways by those skilled in the art without departing from the principle and purpose of the present invention. The protection scope of the present invention shall be based on the claims and shall not be limited by the above-mentioned specific implementation. Each implementation scheme within its scope shall be subject to the constraints of the present invention.

Claims

1. A real-time verification and safety redundancy travel perception system, characterized in that: include: A double magnet trigger mechanism connected to the brake pedal through a linkage mechanism and a double independent magnetic channel sensing unit arranged outside the double magnet trigger mechanism, wherein: the linkage mechanism drives the double magnet trigger mechanism and the double independent magnetic channel sensing unit to move relative to each other according to the rotation of the brake pedal, and the double independent magnetic channel sensing unit realizes real-time verification of the brake pedal position and safe redundant stroke perception by detecting changes in the two superimposed magnetic fields of the double magnet trigger mechanism; The linkage mechanism comprises: a buckle connected to the brake pedal, and a pedal push rod with two ends respectively connected to the buckle and the double magnet trigger mechanism; The double-magnet trigger mechanism comprises: a rear piston and two magnet units sequentially arranged inside the rear piston, wherein: the two magnet units are connected with the same magnetic poles in a relative manner.

2. The real-time verification and safety redundant travel perception system according to claim 1 is characterized in that: The dual magnetic channel sensing unit comprises: a valve body and two sets of independent electromagnetic sensing chips and control modules arranged thereon, and operates in a master-slave architecture mode.

3. The real-time verification and safety redundant travel perception system according to claim 1 is characterized in that: The buckle is a U-shaped structure and is threadedly connected to the end of the pedal push rod through an inner hole.

4. The real-time verification and safety redundant travel perception system according to claim 1 is characterized in that: One end of the pedal push rod is provided with a ball head, and the outer end of the push rod seat is a bell mouth matching the ball head of the pedal push rod, so that the spherical groove of the push rod seat is rotatably connected with the ball head of the pedal push rod.

5. The real-time verification and safety redundant travel perception system according to claim 1 is characterized in that: The two magnet units are sequentially arranged in the rear piston through a magnet sleeve and a partition plate. The inner hole of the rear piston and the outer cylindrical surface of the magnet sleeve are configured to be clearance-matched and fixedly connected after being injected with glue.

6. The real-time verification and safety redundant stroke sensing system according to claim 5 is characterized in that: The inner hole of the rear piston and the push rod seat are configured to form a hole-axis interference fit, and are fixedly connected after being pressed in with the help of axial external force.

7. The real-time verification and safety redundant stroke perception system according to claim 2 is characterized in that: The master-slave architecture mode means that two electromagnetic sensors are respectively connected to the control module to output sensor current, and the control module realizes real-time verification of the brake pedal position and safe redundant stroke perception by comparing the magnitude of the sensor current collected at two different positions; The control module includes: an integrated circuit board and a current amplifier, a digital-to-analog converter, a dual-channel magnetic induction device and a microprocessor arranged thereon, wherein: the dual-channel magnetic induction device is connected to the current amplifier and transmits current information, the current amplifier is connected to the digital-to-analog converter to convert analog signals into digital signals, and the digital-to-analog converter is connected to the microprocessor to transmit digital signals to identify the distance between the pedals.

8. The real-time verification and safety redundant stroke perception system according to claim 2 is characterized in that: The control module is disposed on the valve body as a whole through a shell, and the bottom surface of the shell is aligned and limited with the groove step disposed on the valve body, so that the superimposed magnetic flux passing through the first cylindrical magnet and the second cylindrical magnet satisfies: in: is the vacuum magnetic permeability, d is the pole spacing, r is the magnet radius, and M is the magnetization intensity.

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