CN102275576A - Automobile brake-by-wire system based on giant magnetostriction - Google Patents

Abstract

A brake-by-wire vehicle system based on giant magnetostriction, which includes a wheel speed sensor, a pedal sensor, an electronic control unit, a giant magnetostrictive brake module, and a power supply, and its pedal sensor is used to receive the driver's braking intention , during the braking process, the pedal angle sensor continuously converts the pedal angle signal into an electrical signal, and inputs it to the electronic control unit. To the giant magnetostrictive braking module, the giant magnetostrictive module outputs braking force according to the current. The H-shaped structure left rocker arm, right rocker arm and connecting arm of the present invention are integrated with the flexible hinge, which makes the structure simple and has less magnetic resistance; the flexible hinge is easy to process and manufacture, has no gap and friction, and can realize high-precision movement without Good for lubrication, no pollution, free from wear and tear, good stability, which can increase the service life of the mechanism.

Description

A car brake-by-wire system based on giant magnetostriction

technical field

The invention relates to a brake-by-wire system, in particular to a brake-by-wire system for automobiles based on giant magnetostriction.

Background technique

Various control systems of automobiles are developing in the direction of electronization and automation. Traditional automotive mechanical control systems will become electrical systems connected to high-performance CPUs through high-speed fault-tolerant communication buses. For example, the car will use electric motors and electronic control signals to realize steering by wire (steer by wire), brake by wire (brake by wire), throttle by wire (drive by wire or throttle by wire) and suspension by wire (suspension by wire). wire) etc. ^[1] , the use of these wire control systems will partially replace the hydraulic and mechanical controls in the existing systems.

The traditional hydraulic brake system has a long oil transmission line, many valve components, and there is a motion inertia and clearance, so there will be a certain delay from the control command to the execution. Different from the traditional brake system, the brake-by-wire system replaces some mechanical components with electronic components, eliminating the vacuum booster, brake master cylinder, pressure adjustment device, proportional distribution valve, oil pipeline and other structures. It simplifies the structure of the vehicle, frees up a lot of space, reduces the weight and simplifies the maintenance work, makes the installation and testing easier and faster, eliminates the penetration of the hydraulic circuit, and makes the car more environmentally friendly. The brake module is controlled by the electronic control unit to realize electronic control, reduce the response time, and improve the active safety of the vehicle. Corresponding programs are designed in the electronic control system, and the electronic control components are manipulated to control the magnitude and distribution of the braking force, which can conveniently realize functions such as brake anti-lock and drive anti-skid.

At present, the brake-by-wire brake system is divided into two types: one is an electro-hydraulic brake system; the other is an electro-mechanical brake system.

Contents of the invention

The purpose of the present invention is to provide an automobile brake-by-wire system based on giant magnetostriction.

The technical solution of the present invention is: a brake-by-wire automobile system based on giant magnetostriction, which includes a wheel speed sensor, a pedal sensor, an electronic control unit, a giant magnetostrictive brake module, and a power supply, and its pedal sensor is used to Receive the driver's braking intention. During the braking process, the pedal angle sensor continuously converts the pedal angle signal into an electrical signal and inputs it to the electronic control unit. Analysis and calculation, the control signal is input to the giant magnetostrictive braking module, and the giant magnetostrictive module outputs braking force according to the current.

The giant magnetostrictive braking module includes an H-shaped compliant structure, a brake pad, and a driving source. A giant magnetostrictive rod wound with a magnetostrictive coil is arranged in the described driving source, and the driving source is placed on the H-shaped compliant mechanism. On the upper end, the flexible hinge on the H-type compliance mechanism includes four cutouts and two flexible shafts—the weakest part between two pairs of cutouts, two of which are the openings between the left rocker arm and the connecting arm, and the other Two cutouts connect the openings of the right rocker arm and the connecting arm, and the magnetostrictive coil generates a magnetic field under the action of current to cause axial displacement of the giant magnetostrictive rod, which pushes the H-shaped compliant mechanism to expand to both sides and controls the giant magnetostrictive rod through the compliant hinge. The axial displacement generated by the telescopic rod is amplified, so that the lower end of the H-type compliance mechanism clamps the brake disc to achieve the braking effect.

Beneficial effects of the present invention:

①. The H-shaped structure left rocker arm, right rocker arm, connecting arm and flexible hinge are integrated into one body, which makes the structure simple and less magnetic resistance.

②. The flexible hinge is easy to manufacture, has no gap and friction, can realize high-precision movement, is free from lubrication, pollution-free, free from wear, has good stability, and can improve the service life of the mechanism; in addition, the flexible hinge has a simple structure and can One-time forming by wire cutting process.

③. The end of the cutout is a circular through hole, which can prevent damage to the mechanism due to stress concentration.

④. The electromagnetic coil can be wound on the giant magnetostrictive material to save space.

⑤. The left rocker arm, right rocker arm, connecting arm and flexible hinge of the H-type compliance mechanism are cut from a piece of spring steel, which has good integrity and simple manufacturing process.

Description of drawings

Fig. 1 is a schematic diagram of the control system of the present invention.

Fig. 2 is a schematic structural diagram of the giant magnetostrictive braking module of the present invention.

Fig. 3 is a schematic structural diagram of the driving source of the present invention.

Detailed ways

An embodiment example is shown in Figure 1-2: a brake-by-wire vehicle system based on giant magnetostriction, which includes a wheel speed sensor 2, a pedal sensor 5, an electronic control unit 4, a giant magnetostrictive brake module 1, and a power supply 3 , its pedal sensor 5 is used to receive the driver's braking intention, during the braking process, the pedal angle sensor 6 continuously converts the pedal angle signal into an electrical signal, and inputs it to the electronic control unit 4, the electronic control unit 4 Analyze and calculate according to the signals input by the wheel speed sensor 2 and the pedal sensor 5, and input the control signal to the giant magnetostrictive braking module 1, and the giant magnetostrictive module 1 outputs braking force according to the current.

The described giant magnetostrictive braking module 4 includes an H-shaped compliant structure 11, a brake pad 10, and a driving source 7. A giant magnetostrictive rod 12 wound with a magnetostrictive coil 13 is arranged in the described driving source 7, and the driving The source 7 is placed on the upper end of the H-type compliance mechanism 11, and the flexible hinge 8 on the H-type compliance mechanism 11 includes four cutouts and two flexible shafts—the weakest part between two pairs of cutouts, wherein the two cutouts are The opening between the left rocker arm and the connecting arm, and the other two cutouts connect the opening of the right rocking arm and the connecting arm. The magnetostrictive coil 13 generates a magnetic field under the action of an electric current to cause the giant magnetostrictive rod 12 to produce axial displacement, pushing the H-shaped The compliance mechanism 11 expands to both sides and amplifies the axial displacement generated by the giant magnetostrictive rod through the compliance hinge 8, so that the lower end of the H-shaped compliance mechanism 11 clamps the brake disc 9 to achieve the braking effect.

Claims (2)

1. A brake-by-wire automobile system based on giant magnetostrictive, is characterized in that: it comprises wheel speed sensor (2), pedal sensor (5), electronic control unit (4), giant magnetostrictive braking module ( 1), the power supply (3), its pedal sensor (5) is used to receive the driver's braking intention, during the braking process, the pedal angle sensor (6) continuously converts the pedal angle signal into an electrical signal, and converts it Input to the electronic control unit (4), the electronic control unit (4) performs analysis and calculation according to the signals input by the wheel speed sensor (2) and the pedal sensor (5), and inputs the control signal to the giant magnetostrictive braking module (1), The giant magnetostrictive module (1) outputs braking force according to the current. 2. A giant magnetostrictive-based automotive brake-by-wire system according to claim 1, characterized in that: said giant magnetostrictive brake module (4) includes an H-shaped compliant structure (11), brake pad (10), driving source (7), the driving source (7) is provided with a giant magnetostrictive rod (12) wound with a magnetostrictive coil (13), and the driving source (7) is placed on an H-shaped compliant The upper end of the mechanism (11), the flexible hinge (8) on the H-type compliant mechanism (11) includes four cutouts and two flexible shafts - the weakest part between two pairs of cutouts, two of which are left The opening between the rocker arm and the connecting arm, and the other two cutouts are the openings between the right rocking arm and the connecting arm. The magnetostrictive coil (13) generates a magnetic field under the action of current to make the giant magnetostrictive rod (12) produce axial displacement. Push the H-type compliance mechanism (11) to expand to both sides and amplify the axial displacement generated by the giant magnetostrictive rod (12) through the compliance hinge (8), so that the lower end of the H-type compliance mechanism (11) clamps the brake disc (9) To achieve the braking effect.

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