Electronic brake system using integrated sensor and method of operating the same

• US 10,179,575 B2
• Filed: 03/17/2016
• Issued: 01/15/2019
• Est. Priority Date: 03/18/2015
• Status: Active Grant

• Current Assignee: Lucas Automotive GmbH (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Original Assignee: Lucas Automotive GmbH (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Inventors: Shin, Sung Hwan, Kwon, Min Seok
• Primary Examiner(s): Badii, Behrang
• Application Number:
  US15/073,468
• Publication Number:
  US 20160272173A1
• Time in Patent Office: 1,034 Days
• CPC Class Codes: B60T 13/66 Electrical control in fluid-pressure brake systems
• CPC Class Codes: B60T 13/74 with electrical assistance or drive
• CPC Class Codes: B60T 2220/04 Pedal travel sensor, stroke sensor; Sensing brake request
• CPC Class Codes: B60T 7/042 by electrical means, e.g. using travel or force sensors
• CPC Class Codes: B60T 8/17 Using electrical or electronic regulation means to control braking detecting or indicating faulty operation B60T8/885
• CPC Class Codes: B60T 8/171 Detecting parameters used in the regulation; Measuring values used in the regulation
• CPC Class Codes: B60T 8/172 Determining control parameters used in the regulation, e.g. by calculations involving measured or detected parameters B60T8/17551 takes precedence
• CPC Class Codes: B60T 8/368 combined with other mechanical components, e.g. pump units, master cylinders
• CPC Class Codes: B60T 8/4077 Systems in which the booster is used as an auxiliary pressure source
• CPC Class Codes: B60T 8/4081 Systems with stroke simulating devices for driver input B60T8/4077 takes precedence
• CPC Class Codes: G01D 5/14 influencing the magnitude of a current or voltage
• CPC Class Codes: G01D 5/20 by varying inductance, e.g. by a movable armature
• CPC Class Codes: G05G 1/30 Controlling members actuated by foot

Abstract

Disclosed herein is an electronic brake system using an integrated sensor, which includes a hydraulic block configured to distribute and supply a fluid to a wheel brake, and having a through-hole penetrated at both sides thereof, a sensor module installed at one side of the hydraulic block having the through-hole, for sensing a linear displacement of a brake pedal and a position of a motor, and an electronic control unit installed to a side of the hydraulic block opposite to the sensor module, in order to determine a movement distance of the pedal, based on the linear displacement of the pedal sensed by the sensor module, and control rotation of the motor depending on the linear displacement of the pedal.

Claims

1. An electronic brake system for a vehicle using an integrated sensor, comprising:

a hydraulic block configured to distribute and supply a fluid to a wheel brake, and having a through-hole disposed on both sides of the hydraulic block to penetrate the hydraulic block;

a sensor module coupled to the through-hole at one side of the hydraulic block for sensing a linear displacement of a brake pedal and a position of a motor; and

an electronic control unit coupled to the through-hole on the other side of the hydraulic block opposite to the sensor module, in order to determine a movement distance of the brake pedal, based on the linear displacement of the brake pedal sensed by the sensor module, and control rotation of the motor depending on the linear displacement of the brake pedal.

2. The electronic brake system according to claim 1, wherein the sensor module comprises:

a sensor housing coupled to the through-hole of the hydraulic block, and having a through-hole penetrated at both sides thereof;

a circuit board installed at one side of the sensor housing and having a through-hole penetrated at both sides thereof, a sensing-related electric part being mounted on the circuit board;

a pedal sensor module mounted at one side of the circuit board, in order to sense a magnetic field variation depending on movement of the pedal, and transfer information about the sensed magnetic field variation to the electronic control unit; and

a motor sensor module mounted at one side of the circuit board, in order to sense an induced current generated by rotation of a rotor, and transfer information about the sensed induced current to the electronic control unit.

3. The electronic brake system according to claim 2, further comprising a connection unit electrically connecting the sensor module to the electronic control unit through the through-hole of the hydraulic block while one end of the connection unit is fixed to the sensor module.

4. The electronic brake system according to claim 3, wherein the pedal sensor module comprises:

an input rod connected to the connection unit so as to be moved depending on movement of the pedal;

a magnet provided at one end of the input rod so as to be moved depending on movement of the input rod; and

a sensor unit configured to sense a magnetic field variation depending on movement of a magnetic substance, and transfer the sensed magnetic field variation to the electronic control unit.

5. The electronic brake system according to claim 4, wherein:

the sensor unit is installed at one side of the circuit board; and

the magnet is disposed above the sensor unit so as to be spaced apart from the sensor unit.

6. The electronic brake system according to claim 4, wherein the sensor unit is one of a Hall device, a reed switch, an AMR (Anisotropic Magneto-Resistive) sensor, and a GMR (Giant Magneto-Resistive) sensor.

7. The electronic brake system according to claim 4, wherein:

the sensor unit responds to a magnetic field having a directional component in an x-z plane or a y-z plane perpendicular to the circuit board to sense a variation of the magnetic field; and

the electronic control unit generates an x-z angle signal or a y-z angle signal indicative of an angle of the directional component of the magnetic field from information about the variation of the magnetic field.

8. The electronic brake system according to claim 2, wherein the motor sensor module comprises:

a coil in which an induced current is generated by movement of the motor rotor; and

a current sensor configured to sense the induced current in the coil and transfer a value of the sensed induced current to the electronic control unit.

9. The electronic brake system according to claim 8, wherein the coil comprises:

a first coil in which a magnetic flux is formed by electric energy generated by rotation of the motor; and

a second coil configured of a pair of coils connected to each other while an induced current is generated according to the magnetic flux in the first coil.

10. The electronic brake system according to claim 9, wherein the electronic control unit determines an rpm of the motor, based on a rotation angle displacement of the motor.

11. A method of operating an electronic brake system for a vehicle, including a hydraulic block configured to distribute and supply a fluid to a wheel brake, and having a through-hole disposed on both sides of the hydraulic block to penetrate the hydraulic block, a circuit board coupled to the through-hole at one side of the hydraulic block and including a pedal sensor module for sensing a linear displacement of a pedal and a motor sensor module for sensing a rotation angle displacement of a motor, and an electronic control unit coupled to the through-hole on the other side of the hydraulic block opposite to the sensor module, the method comprising:

sensing a variation of a magnetic field generated by a magnet moved along with movement of an input rod;

determining a movement distance of the pedal, based on an intensity and a direction of the magnetic field;

sensing a position of the motor; and

controlling rotation of the motor corresponding to the movement distance of the pedal.

12. The method according to claim 11, further comprising determining a rotation displacement of the motor, based on the rotation of the motor.

13. The method according to claim 12, further comprising:

responding to a magnetic field having a directional component in an x-z plane or a y-z plane perpendicular to the circuit board to sense a variation of the magnetic field; and

generating an x-z angle signal or a y-z angle signal indicative of an angle of the directional component of the magnetic field from information about the variation of the magnetic field.

14. The method according to claim 11, wherein:

in the sensing a position of the motor, the position of the motor is sensed through an induced current generated in a coil by movement of a motor rotor; and

the coil comprises a first coil in which a magnetic flux is formed by electric energy generated by the rotation of the motor, and a second coil configured of a pair of coils connected to each other while an induced current is generated according to the magnetic flux in the first coil.