KR19980056936A - Braking force control device using ER (Electro-Rheological) fluid - Google Patents

Abstract

The present invention relates to a braking device for a vehicle, and more particularly, an ECU (Electronic Control Unit) receiving a pedal operation signal corresponds to a pedal stroke, not a method of obtaining a braking force by converting a pedaling force of a currently used pedal into a hydraulic force. By applying electric force to ER (Electro-Rheological) fluid, the braking force that restrains the disc wheels can be obtained by regulating the voltage to maintain the maintenance, wiring, environmental pollution and control performance of the conventional hydraulic brake system. It is to provide a braking force control device of the vehicle using the improved ER fluid.

Description

Braking force control device using ER (EIectro-Rheological) fluid

As is well known, a system for obtaining ideal pedal characteristics, that is, a hydraulic brake system includes a CBS (Conventional Brake System), an ABS (And-lock Brake System), and a TCS (Traction Control System). In order to stop the disc wheel, the brake pedal effort is converted into hydraulic force (energy) to obtain a braking force.

Conventionally, as shown in FIG. 1, a pedal 1 for generating a step force by a driver, a vacuum booster 2 for amplifying a step force, and a master cylinder for converting a force due to a step force to hydraulic energy to brake a driving car as shown in FIG. 1. (3), hydraulic line (4) (4-1, ..., 4-6) Hydrolic unit (5), which is a hydraulic device that prevents slippage, PCRV (6) that controls the braking force by reducing the pressure of the rear wheel, The disk wheel 10 being rotated, the wheel cylinder 11, the piston 12, the pad 13, and the wheel speed sensor 14 which detects the lock of the wheel of the vehicle, which hold it hydraulically, and the slip of the vehicle body from this signal. It is composed of an ECU (7) for judging and operating the hydraulic unit (5).

When the driver presses the pedal to stop or decelerate at the driver's will, this force opens and closes the valve of the vacuum booster 2, and the force caused by the differential pressure between the vacuum and atmospheric pressure acts as a force to advance the master cylinder 3. Then, the brake oil in the master cylinder 3 is delivered to the wheel cylinder 11 through the working hydraulic line 4 under pressure. At this time, the pressure acting on the wheel cylinder 11 pushes the piston 12, and this force acts on the rotating surface of the disk 10 to reduce the rotating force to brake the vehicle. At this time, the PCRV (6) is adjusted by varying the braking force distribution of the front wheel and the rear wheel.

In addition, the hydraulic unit 5 is an additional device for preventing slippage of the vehicle body. When the wheel locking occurs according to the signal of the wheel speed sensor 14, the ECU 7 determines that the wheel slips and adjusts the pressure of the wheel. An unconstitutional device adjusts the hydraulic pressure so that the wheel is not anti-locked while the hydraulic pressure is reduced, increased and maintained.

Such a conventional apparatus adjusts the pressure caused by the pedaling force of the pedal to the hydraulic pressure, the vacuum booster (2) to amplify the pedaling force by braking, the master cylinder (3) to change the hydraulic pressure, the hydraulic line (4) to adjust the pressure Devices such as a hydraulic unit (5) and a PCRV (6) for distributing braking force are required.

Moreover, the conventional hydraulic system requires regular inspection due to the contamination and replacement of the working oil, the number of parts, the price is high, and the length of the car becomes difficult, and the handling of the hydraulic wiring becomes difficult. It has disadvantages such as showing a difference in characteristics.

In addition, the noise and heat generated by the friction between the disk and the pad is severe, there are a number of problems such as deterioration during continuous braking.

Therefore, in order to solve the above-mentioned problems, the present invention uses the characteristics of the electrical stress of the ER fluid depending on the voltage applied to the shear stress maintenance, repair, wiring, environmental pollution and control of the conventional hydraulic system It's about improving performance.

1 is an illustration of a conventional braking force control device,

Figure 2 is an illustration of the braking force control device according to the present invention,

3 is a shear stress characteristic diagram of the voltage of the ER fluid used in the present invention,

4 is a detailed view of the main portion of the braking force control device according to the present invention,

5 is an exemplary view showing another embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

1: pedal 2: vacuum booster 3: master cylinder

4: Hydraulic Line 5: Hydrolic Unit 6: PCRV

7 ECU 10 Disc wheel 11 Wheel cylinder

12: piston 13: pad 14: wheel speed sensor

21: chamber 22: ER (Electro-Rheological) fluid

24: power supply device 25: voltage divider 26: acceleration sensor

27: stroke member 28: voltage amplifier

29: leak proof seal

As shown in FIG. 2, the present invention relates to a disk 10 that is connected to a rotating shaft by an electrical signal and to a chamber 21 in which an ER fluid 22 is filled to restrain the rotation of the disk 10. , The electric wiring 23 and the wheel speed sensor 14 for detecting the wheel lock, the ECU 7 and the power supply device 24 for determining and supplying the power, and the voltage distribution device for allocating voltage to each wheel. (25), an acceleration sensor (26) attached to adjust the deceleration of the vehicle, a stroke member (27) for converting the action force of the pedal into a stroke, a voltage amplifier (28) for amplifying the stroke with voltage, It consists of a pair of seals 29 which prevent leakage of the ER fluid 22.

3 is a diagram showing the shear stress characteristics with respect to the electrical applied voltage of the ER fluid; the ER fluid 22 filled in the chamber 21 is isotropic ( However, when the electric field is applied to the ER fluid, the particles dispersed in the fluid generate induced polarization and form a large number of fibrous tissues that strike the electrode, thus creating an anisotropic behavior, which causes It shows resistance to the applied shear force.

This characteristic is characterized by controlling the braking force by controlling the shear force as an electrical load.

Referring to the operation of the present invention configured as described above are as follows.

In the configuration as shown in Figs. 2 and 4, it is necessary to stop the driving vehicle. When the driver steps on the pedal 1, the voltage generated in proportion to the pedal stroke is transmitted to each wheel. At this time, the transferred electricity increases the shear stress of the ER fluid 22 in the chamber 21 to restrain the rotation of the disk 10 to reduce the rotational force.

It is possible to stop the vehicle completely by continuous voltage rise.

And the braking deceleration can be adjusted by using the acceleration sensor 26 attached to the pedal to produce the desired braking deceleration.

In addition, when the braking force needs to be adjusted by the locking of the wheel, the ECU determines the signal from the sensor to control and regulate the voltage, thereby producing the same effect as the current ABS device.

5 illustrates another embodiment of the present invention.

As such, the present invention reduces the number of other components such as vacuum boosters, master cylinders, hydraulic lines, PCRVs, hydraulic units, and the like, by controlling the braking force of each wheel by an electric signal, which is very advantageous in terms of cost as well as hydraulic method. By oil leakage, regular oil replenishment, there is no advantage of wiring difficulties.

In addition, the braking force is controlled by the electric characteristics of the ER fluid instead of the friction between the disk and the pad, so that the shear force acts as the braking force, resulting in fast response and quiet operation. It can be used semi-permanently because there is no difficulty in maintenance, and it is advantageous in terms of the environment since the filling of brake fluid and other parts are not consumed.

As described above, according to the present invention, the braking force is controlled by the electric signal, and thus the structure is very simple, the response is fast, and the operation is quiet, and there is no noise due to the braking.

The present invention relates to a braking device for a vehicle, and more particularly, an ECU (Electronic Control Unit) receiving a pedal operation signal corresponds to a pedal stroke, not a method of obtaining a braking force by converting a pedaling force of a currently used pedal into a hydraulic force. By applying electric force to ER (Electro-Rheological) fluid, the braking force that restrains the disc wheels can be obtained by regulating the voltage to maintain the maintenance, wiring, environmental pollution and control performance of the conventional hydraulic brake system. It is to provide a braking force control device of the vehicle using the improved ER fluid.

Claims (4)

In constructing a vehicle braking device, the braking force control device of the vehicle using the ER fluid, characterized in that the braking force of the vehicle is used as a braking force by adjusting the shear force by the electrical characteristics of the ER fluid instead of the friction method of the disk and the pad. . The disk 100 connected to the rotating shaft by the electrical signal, the chamber 21 filled with the ER fluid 22 to restrain the rotation of the disk 10, the electrical wiring 23 and the circle. Wheel speed sensor 14 for detecting the winding, ECU 7 and the power supply device 24 for determining the power supply and determining the power, braking force control device of the vehicle using the ER fluid. 3. A voltage distribution device (25) for allocating voltage to each wheel, an acceleration sensor (26) for adjusting the deceleration of the vehicle, a stroke member (27) for converting an action force of the pedal into a stroke, and A braking force control device for a vehicle using ER fluid, characterized in that it comprises a voltage amplification device (28) for amplifying the stroke to a voltage. 3. The braking force control apparatus for a vehicle using ER fluid according to claim 2, wherein a pair of seals are inserted into the chamber to prevent leakage of the ER fluid.