KR101134902B1 - electronic parking brake system - Google Patents

Abstract

The present invention relates to an electronic parking brake system, and more particularly, to an electronic parking brake system that can reduce the manufacturing cost by configuring to operate without using the MCU in the electronic parking brake device.

An object of the present invention is to provide a low-cost electronic parking brake device for a driver who does not need many convenience functions in an expensive electronic parking brake device and only wants to operate and release the parking brake, thereby preventing unnecessary waste of consumers and various demands of the consumer. To provide an electronic parking brake system that can satisfy the.

In order to achieve the above object, the present invention includes a parking operation switch installed so that the driver selects parking and release, and an actuator configured to include a motor (M) to pull or release the parking cable according to the parking and release signal. In the electronic parking brake system,

Parking Hall sensor installed at regular intervals to detect the position of the magnet (1) is installed at the end of the spindle (S) that is expanded and contracted during operation of the actuator, and the parking and release status signal by detecting the position of the magnet (1) And a plurality of relays installed to control the rotation of the release Hall sensors 2 and 2 'and the motor M for operating the actuator, and the relays output the output values and the ignition key signal and the driver's And a relay driver configured to forward and reverse rotation by the parking operation switch.

EPB, electronic parking brake, EPB without MCU

Description

Electronic parking brake system

1 is a schematic block diagram showing a connection state of a motor and a relay in an electronic parking brake system according to the present invention;

FIG. 2 is a schematic diagram showing an installation state of an actuator and a hall sensor connected to the motor in FIG.

3 is a table showing a combination of a relay and a parking operation switch according to the present invention;

DESCRIPTION OF THE REFERENCE NUMERALS

1: magnet 2: parking hall sensor

2 ': release hall sensor M: motor

S: spindle

The present invention relates to an electronic parking brake system, and more particularly, to an electronic parking brake system that can reduce the manufacturing cost by configuring to operate without using the MCU in the electronic parking brake device.

In general, a vehicle is provided with a brake device for stopping a vehicle, as well as a parking brake device for stably stopping the vehicle at the time of parking.

The parking brake device described above typically uses a lot of devices configured to be operated while the driver pulls the parking brake lever, but for convenience of operation, the electronic parking brake system enables the driver to park stably by simply operating a switch. Was developed.

The above-mentioned electronic parking brake device facilitates parking by allowing the parking cable to be pulled with a certain force by the operation of the parking operation switch, and automatically releases the parking brake when driving in conjunction with the ECU of the vehicle and provides stable braking force even on a slope. It is to be secured.

In addition, the parking brake is automatically released at the start of the ramp in conjunction with the ECU, and the tension of the parking cable is detected and the tension is automatically adjusted.

The electronic parking brake device as described above is composed of an actuator and an ECU, which are mechanical components, and the ECU includes a MCU (MICRO CONTROL UNIT), a sensor interface (SENSOR INTERFACE), a motor driver, and a CAN communication module. Will be done.

The MCU is to enable the automatic control of the parking brake by determining whether the parking brake is activated or released in the current vehicle based on the information from each sensor and the information transmitted through the communication module in a control device such as an ABS ECU. .

However, when the electronic parking brake device is configured using the MCU as described above, the driver's convenience is improved, but there is a problem that the vehicle price is increased because the manufacturing cost is high.

That is, depending on the driver, all the convenience functions of the above-described electronic parking brake device may not be necessary and only the operation and release of the parking brake may be necessary, but by applying the expensive electronic parking brake device collectively, the driver is unnecessary. There is a problem with spending.

Accordingly, an object of the present invention is to solve the above problems, by providing an inexpensive electronic parking brake device to a driver who does not need many convenience functions in an expensive electronic parking brake device and only wants to activate and release the parking brake. The present invention provides an electronic parking brake system capable of preventing unnecessary waste of consumers and satisfying various needs of consumers.

In order to achieve the above object, the present invention provides an electronic parking brake including a parking operation switch installed so that a driver selects parking and release, and an actuator configured to include a motor to pull or release the parking cable according to the parking and release signal. In the system,

A magnet installed at an end of the spindle that expands and contracts during operation of the actuator, a parking hall sensor and a release hall sensor installed at regular intervals to detect the position of the magnet to generate parking and release status signals, and the actuator A plurality of relays installed to control the rotation of the motor for operating the motor, and a relay driver configured to reversely rotate the relays by the output value from the hall sensor and the ignition key signal and the driver's parking operation switch. do.

1 is a block diagram illustrating an electronic parking brake system according to the present invention, and FIG. 2 is a schematic view showing a state in which a hall sensor is installed in an actuator, and the parking cable is pulled to a parking state (APPLY) or released to release parking (RELEASE). Parking Hall sensor installed at regular intervals to detect the position of the magnet (1) and the magnet (1) installed at the end of the spindle (S) of the actuator for controlling the parking brake to be in a state to generate the parking and release status signals And first, second, third and fourth relays installed to control the rotation of the release hall sensors 2 and 2 ', the motor M for rotating the gears of the actuator, and the relays to the hall sensors 2. 2 ') and a relay driver configured to reverse run by the driver's parking operation switch.

The relays are H-BRIDGE type transistors (not shown) which are commonly used for the forward and reverse rotation driving of the motor (M).

The movement of the spindle (S) in the actuator is to move the spindle (S) screwed to it when the screw nut (N) rotated by the gear.

The relay driver is configured to operate the relay by signals of the ignition key, the parking operation switch of the parking brake, the parking hall sensor, and the release hall sensors 2 and 2 ', and the output value from the first relay driver is parked. The APPLY signal of the operation switch is output as it is from the buffer gate, and the output value of the second relay driver is the output value of the AND gate according to the signal of the ignition key and the RELEASE signal.

The output value of the third relay driver is the output value of the NAND gate according to the signals LRHS and RRHS of the left and right release hall sensors 2 'and the AND gate output value of the release signal, and the output value of the fourth relay driver is left and right. An ANAD gate output value corresponding to the signals LAHS and RAHS of the parking hall sensor 2 and an AND gate output value of the parking signal.

Referring to the operation and effect of the present invention as described in the table of Figure 3 described above, when the driver turns on the parking operation switch for parking, the parking signal HIGH is input to the first relay driver and the first relay Will be driven.

In addition, the parking signal HIGH is input to the AND gate of the fourth relay driver. When the output value from the left and right parking hall sensors 2 is LOW, HIGH is output to the AND gate to operate the fourth relay. The motor (M) drives the gear of the actuator to pull the parking cable to operate the parking brake.

That is, when the output value from the left and right parking hall sensors 2 is LOW, the vehicle is not currently parked. Therefore, a HIGH signal is output from the fourth relay driver to drive the motor M. However, the left and right parking hall sensors 2 are used. If the HIGH signal is output from, the motor does not operate because the fourth relay does not operate.

Of course, the spindle (S) of the actuator is operated by the drive of the motor (M), the magnet 1 is moved to the release Hall sensor 2 'position.

As described above, when the parking state is detected, the magnet 1 mounted to the spindle S of the actuator is detected by the parking hall sensor 2. In this state, the driver steps on the accelerator pedal or turns off the parking operation switch. In this case, the release signal is input to the second relay driver from the parking operation switch.

Of course, if the HIGH signal is input to the second relay driver while the ignition key is turned on, the second relay operates. If the LOW signal is input while the ignition key is turned off, the second relay driver outputs a LOW signal. As a result, the second relay does not operate.

That is, when the vehicle is turned off, the driver does not release the parking brake even when the driver tries to release the parking brake.

In addition, when the release signal of the parking operation switch is input to the third relay and the output value from the left and right release hall sensors 2 'is HIGH, the HIGH signal is output from the AND gate of the third relay driver to drive the third relay. do.

When the second and third relays operate, the gear of the actuator rotates in reverse while the motor M rotates in reverse, thereby releasing the parking brake.

As described above, the present invention provides electronic parking through a parking hall sensor and a release hall sensor for detecting parking and releasing positions of magnets and magnets installed on the spindles of the first, second, third, and fourth relays and actuators driven by the H-BRIDGE type. By constructing the brake device, there is an advantage that the electronic parking brake device can be inexpensively provided to the user who does not need the expensive electronic parking brake device.

Claims (2)

An electronic parking brake system comprising a parking actuating switch installed to allow a driver to select parking and releasing, and an actuator configured to include a motor to pull or release the parking cable in response to a parking and releasing signal, A magnet (1) installed at the end of the spindle (S) which expands and contracts during operation of the actuator, A parking hall sensor 2 and a release hall sensor 2 'installed at regular intervals to detect a position of the magnet to generate a parking state signal and a release state signal; A first relay, a second relay, a third relay, a fourth relay installed in an H-bridge type to control the rotation of the motor M for operating the actuator; And a relay driver for rotating the motor M forward and backward by an output value of the release hall sensor, an output value from the parking hall sensor, an ignition key signal, and a driver's parking operation switch. The relay driver, When the parking operation switch is turned on, the first relay is driven, and when the output value of the parking hall sensor is low while the first relay is driven, the fourth relay is driven so that the motor rotates forward. When the ignition key is turned on, the second relay is driven, and when the output value of the release hall sensor is high while the second relay is driven, the third relay is driven so that the motor rotates in reverse. Parking brake system. The method of claim 1, wherein the relay driver A first relay driver which is a buffer gate for outputting the parking signal of the parking operation switch as it is; A second relay driver which is an AND gate for outputting a value according to the signal of the ignition key and the release signal of the parking operation switch; A third relay driver which is an AND gate for outputting a logical sum of an output value of the NAND gate according to the signal from the release hall sensor and the release signal of the parking operation switch; And a fourth relay driver which is an AND gate for outputting a logical sum of a NAND gate output value according to the signal of the parking hall sensor and the parking signal of the parking operation switch.

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