KR20120054229A

KR20120054229A - Pedal simulator

Info

Publication number: KR20120054229A
Application number: KR1020100115500A
Authority: KR
Inventors: 권용식
Original assignee: 현대모비스 주식회사
Priority date: 2010-11-19
Filing date: 2010-11-19
Publication date: 2012-05-30

Abstract

The magnet 11 is coupled to the pedal simulator of the present invention at a predetermined deflection angle a to the piston 6, and is attached to the outside of the cylinder 4 which accommodates the piston 6. The stroke sensor 12 which detects a stroke change and transmits it to the ECU 1 is provided, so that the initial value 0 of the stroke sensor 12 for recognizing the initial position value by the ECU 1 when the pedal simulator is initialized fails. In this case, it is possible to recognize the initial value 0 of the stroke sensor 12 only by the rotation operation of the magnet 11 without any hardware change.

Description

Pedal Simulator

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pedal simulator. More particularly, the present invention relates to a pedal simulator that can perform initialization error correction with a simple operation without changing hardware.

In general, a brake by wire system (BBW) is a method of braking a vehicle without using hydraulic pressure.

The BBW (Brake By Wire System) has an EMB (Electro mechanical Brake), which uses an actuator power with a 12V voltage motor as the wheel disc braking force, or self-energizes the motor power with a wedge structure using the wheel disc braking force. EWB (Electro Wedge Brake) is applied, which creates a large braking force.

In addition, the hydraulic pressure is not applied to the BBW is further provided with a pedal simulator that makes the pedal feel to the driver operating the pedal, such a pedal simulator is configured to form a pedal feeling by the damper or spring force of the rubber material.

The pedal simulator includes a stroke sensor for transmitting a change of stroke to the ECU, and the stroke sensor typically applies a method of detecting a movement of the ring magnet.

The magnet type stroke sensor as described above performs initialization before mounting on the BBW. If the hardware initial position value is not recognized as the initial value (0) of the sensor signal, the required braking force of the user may not be realized. Because it is not.

The inherent error of the magnet type stroke sensor affecting the initialization must be corrected in hardware, so that failure of the hardware action will not only produce a bad pedal simulator but also make it more difficult to meet the high sensor sensitivity requirements. There will be no.

Accordingly, the present invention in view of the above point corrects the initialization effect due to the error of the magnet type stroke sensor itself without hardware redesign or structural change, thereby preventing mass production of the defective pedal simulator due to the failure of the stroke sensor initialization. The aim is to provide a pedal simulator that can prevent and satisfy high sensor sensitivity requirements.

The present invention for achieving the above object in the pedal simulator that provides a reaction force according to the pedal operation,

A magnet provided on the operation rod receiving the stroke of the pedal and coupled to the piston for pressing the elastic damper provided inside the cylinder to have a predetermined inclination angle; Characterized in that configured to include a stroke sensor.

The inclination angle of the magnet has an upward extension angle at which a portion of the magnet closer to the stroke sensor is opened, and is inclined at 15 degrees.

The present invention has the effect of preventing the mass production of the defective pedal simulator and the cost reduction by correcting the initialization effect due to the error of the magnet type stroke sensor itself without hardware redesign or structural change.

In addition, since the present invention satisfies the high sensor sensitivity demand as a signal initialized by a user performing an operation during initialization correction, the present invention also has an effect of accurately implementing the required level of the pedal feeling.

1 is a block diagram of a pedal simulator according to the present invention applied to a brake by wire system (BBW), Figure 2 (a) to (c) is before the pedal simulator according to the invention is mounted on a BBW In the case of initialization failure, the operation is executed again without any hardware change.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Since the exemplary embodiments of the present invention may be embodied in various different forms, one of ordinary skill in the art to which the present invention pertains may be described herein. It is not limited to the Example to make.

1 is a block diagram of a pedal simulator according to the present invention applied to a brake by wire system (BBW).

As shown in the figure, the BBW includes an ECU 1 for calculating and controlling a required braking force according to the stroke of the pedal 2 for implementing the braking will, and a pedal for transmitting a reaction force to the pedal 2 so as to feel a pedal feeling to the driver. It consists of a simulator 3 and a brake 20 controlled by the ECU 1 to implement braking.

The brake 20 uses EMB (Electro mechanical Brake), which uses an actuator power with a 12V voltage motor as the wheel disk braking force, or self-Energizing the motor power in a wedge structure using the wheel disk braking force to provide a large braking force. EWB (Electro Wedge Brake).

The pedal simulator 3 includes a cylinder 4 having a chamber formed therein, an operating rod 5 connected to the pedal 2 to move directly under the stroke of the pedal 2, and the operating rod 5. A piston 6 provided at the end of the cylinder, a rubber damper 7 accommodated in the chamber of the cylinder 4 to transmit reaction force to the piston 6, and a movement distance of the piston 6 is detected. The sensor member 10 is transmitted to the ECU (1).

The sensor member 10 is a magnet 11 moving together with the piston 6 and a stroke sensor attached to the outside of the cylinder 4 to detect a stroke change of the magnet 11 and transmit it to the ECU 1. 12).

The magnet 11 is a ring type fitted to the outer diameter of the piston 6, and is assembled in a state inclinedly coupled to the piston 6 at a predetermined inclination angle a.

As shown in FIG. 1, the inclination angle a direction has an upward extension angle at which a portion of the magnet 11 closer to the stroke sensor 12 is opened.

The inclination angle a is formed at an appropriate inclination angle, and is formed at an inclination angle of about 15 degrees in this embodiment.

In addition, the magnet 11 is mechanically perfectly coupled to the piston 6 and is designed such that the axial shaking of the piston 6 is controlled by sufficient sliding resistance of the cylinder 4.

2 (a) to 2 (c) show an operation diagram of re-executing initialization without a hardware change upon initialization failure performed before the pedal simulator according to the present invention is mounted on the BBW.

That is, the stroke sensor 12 detects the stroke change of the magnet 11 at the initialization of the pedal simulator, and is not recognized as the initial value 0 of the stroke sensor 12 for recognizing the initial position value in the ECU 1. In this case, the initial reset state for recognizing the initial value (0) is simply displayed without changing hardware of the pedal simulator.

When the initialization is performed again in the initial initialization failure state, as shown in (a), the operator rotates (M) the operating rod 5 exposed to the outside of the cylinder (4).

The rotation of the operation rod 5 as described above, the magnet 11 is also rotated by rotating the piston 6 together, the magnet 11 as shown in Fig. 2 (b) by the rotation of the magnet 11 signal affected zone By positioning at K, the stroke sensor 12 can recognize the initial value 0. FIG.

This is due to the characteristic of the stroke sensor 12 is not affected by the signal of the stroke sensor 12 other than the signal influence section (K) close to it.

When the initial position value is recognized as the signal initial value 0 of the stroke sensor 12 by the ECU 1 as described above, the force F is applied to the operating rod 5 as shown in FIG. 6) together with the magnet (11) is pushed, and the suitability test by the detection of the stroke sensor 12 for the stroke change of the magnet (11).

As described, the pedal simulator equipped with the magnet 11 and the stroke sensor 12 according to the present embodiment has an initial value of the stroke sensor 12 only by the rotation operation of the magnet 11 without any hardware change upon initialization. (0) can be recognized.

1: ECU 2: Pedal
3: pedal simulator 4: cylinder
5: working rod 6: piston
7: elastic damper 10: sensor member
11: magnet 12: stroke sensor
30: brake

Claims

In the pedal simulator that provides a reaction force according to the pedal operation,
A magnet provided on the operation rod receiving the stroke of the pedal and coupled to the piston for pressing the elastic damper provided inside the cylinder to have a predetermined inclination angle; A pedal simulator comprising a stroke sensor.

The pedal simulator of claim 1, wherein the inclination angle of the magnet has an upward extension angle at which a portion of the magnet closer to the stroke sensor is opened.

The pedal simulator of claim 2, wherein the angle of inclination of the magnet is 15 degrees.