KR102398020B1 - Integrated electronic control system - Google Patents

Abstract

An integrated electronic control system is disclosed. An integrated electronic control system according to an embodiment of the present invention includes a sensor unit that detects vehicle state information including wheel speed and steering angle of a vehicle, an EPB actuator that provides parking braking force to each wheel, and a wheel cylinder of each wheel. An ESC actuator that adjusts the supplied hydraulic pressure and an integrated ECU that controls the EPB actuator to generate parking braking force for each wheel, and controls the ESC actuator to adjust the braking hydraulic pressure supplied to the wheel cylinder of each wheel; is, a sensor interface that provides a communication interface with the sensor, an H-BRIDGE circuit that drives the EPB actuator, an ASIC that drives the ESC actuator, and a built-in YAW&G sensor and sensor that detects the vehicle's yaw rate and acceleration The vehicle status information detected through the unit is received through the sensor interface unit, the vehicle's yaw rate and acceleration information detected through the built-in YAW&G sensor unit is received through the internal communication bus, and the received vehicle status information, yaw rate and acceleration information are received. Based on the H-BRIDGE circuit, it includes an MCU that outputs a control signal for operating the ASIC.

Description

INTEGRATED ELECTRONIC CONTROL SYSTEM

The present invention relates to an integrated electronic control system, and more particularly, to an Electronic Stability Control System (ESC system) and an Electronic Parking Brake system through one Electronic Control Unit (ECU). It relates to an integrated electronic control system that controls the Brake System (EPB system).

In general, an ESC system prevents understeer or spin by controlling a braking force and a driving force of a vehicle in order to secure driving stability of the vehicle. The EPB system is a device that automatically operates or releases the parking brake by determining whether the brake is in operation.

The integrated electronic control system disclosed in Korean Patent Publication No. 10-2009-0077178 uses several electronic control units by replacing the electronic control unit (ECU) installed in the ESC system and the EPB system, respectively, with one integrated electronic control unit. Various problems such as electrical wiring, installation space, and cost are minimized.

The ESC system detects the vehicle condition and road surface condition through vehicle sensors such as wheel speed sensor, pressure sensor, steering angle sensor, yaw rate sensor, and acceleration sensor, and according to the detection result, the vehicle condition changes to the direction in which the vehicle is turning. By determining whether oversteer is inward or understeer is outward in the direction in which the vehicle is turning, the ESC actuator is activated to apply brake hydraulic pressure to the outer wheel in the direction in which the vehicle is turning, and understeer In case of operation, the vehicle's stability is secured by operating the ESC actuator to press the brake fluid pressure to the inner wheel to control the vehicle's attitude.

Therefore, since various sensors (eg, wheel speed sensor, pressure sensor, steering angle sensor, yaw rate sensor, acceleration sensor, etc.) for detecting the state of the vehicle are provided in the prior art, electricity for connection with each sensor is provided. The wiring harness of the vehicle is still complicated because wiring is required.

On the other hand, recently, a yaw rate sensor (YAW&G sensor) that integrates a yaw rate sensor and an acceleration sensor into one sensor is being used. The yaw rate & G-sensor is a sensor that measures the yaw rate and acceleration, which are the rotational angular speeds of the vehicle while the vehicle is running. The yaw rate & G sensor includes a separate electronic control unit, and uses the electronic control unit to process the detection signal and perform CAN (Controller Area Network) communication with the ECU of the ESC system. Therefore, in the case of the ESC system to which the yaw rate & G sensor is applied, the manufacturing cost of the vehicle increases due to the use of the electronic control unit, a separate electrical wiring is required, and the efficient design and arrangement of the vehicle is difficult due to the space occupied by the electronic control unit. There is a difficult problem.

Korean Patent Publication No. 10-2009-0077178 (published on July 15, 2009)

An embodiment of the present invention is to provide an integrated electronic control system capable of simplifying the wiring harness of the vehicle, reducing manufacturing cost, and enabling efficient design and arrangement of the vehicle even for a system to which the yaw rate & G-sensor is applied .

According to one aspect of the present invention, a sensor unit for detecting vehicle state information including a wheel speed and a steering angle of the vehicle; EPB actuators that provide parking braking force to each wheel; an ESC actuator for controlling the hydraulic pressure supplied to the wheel cylinders of each wheel; and an integrated ECU that controls the EPB actuator to generate parking braking force for each wheel, and controls the ESC actuator to adjust the braking hydraulic pressure supplied to the wheel cylinder of each wheel, wherein the integrated ECU comprises: a sensor interface unit providing a communication interface with the sensor unit; an H-BRIDGE circuit for driving the EPB actuator;

an ASIC that drives the ESC actuator; a built-in YAW&G sensor for detecting the yaw rate and acceleration of the vehicle; and receiving vehicle state information detected through the sensor unit through the sensor interface unit, and receiving yaw rate and acceleration information of the vehicle detected through the built-in YAW&G sensor unit through an internal communication bus, and the received vehicle state information , an MCU for outputting a control signal for operating the H-BRIDGE circuit unit and the ASIC based on the yaw rate and acceleration information, and the built-in YAW&G sensor unit is connected to the ASIC to receive driving power from the ASIC , the built-in YAW&G sensor unit is connected to the MCU, performs SPI (Serial Peripheral Interface) communication with the MCU, and transmits the detected yaw rate and acceleration to the MCU through the SPI communication An integrated electronic control system can be provided there is.

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In the embodiment of the present invention, even if the yaw rate & G sensor is applied, the wiring harness of the vehicle can be simplified, the manufacturing cost can be reduced, and the efficient design and arrangement of the vehicle is possible.

1 is a schematic control block diagram of an integrated electronic control system according to an embodiment of the present invention.
2 is a view for explaining an integrated electronic control unit of the integrated electronic control system according to an embodiment of the present invention.
3 is a view for explaining the operation of the integrated electronic control unit of the integrated electronic control system according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments introduced below are provided as examples in order to sufficiently convey the spirit of the present invention to those of ordinary skill in the art to which the present invention pertains. The present invention is not limited to the embodiments described below and may be embodied in other forms. In order to clearly explain the present invention, parts irrelevant to the description are omitted from the drawings, and in the drawings, the width, length, thickness, etc. of components may be exaggerated for convenience. Like reference numerals refer to like elements throughout.

1 is a schematic control block diagram of an integrated electronic control system according to an embodiment of the present invention, and FIG. 2 is a view for explaining an integrated electronic control unit of the integrated electronic control system according to an embodiment of the present invention.

1 and 2 , the integrated electronic control system includes an integrated electronic control unit (hereinafter, integrated ECU) 10 that performs overall control.

The sensor unit 20 is electrically connected to the input side of the integrated ECU 10 .

The EPB actuator 30 and the ESC actuator 40 are electrically connected to the output side of the integrated ECU 10 .

The sensor unit 20 detects the state of the vehicle.

The sensor unit 20 detects the state of the vehicle and transmits the state information of the vehicle to the integrated ECU 10 . The vehicle state information may include, for example, a wheel speed of each wheel, a steering angle of a steering wheel, a master cylinder/wheel cylinder pressure, a tension of a parking cable, a rotation speed of an EPB driving motor, and the like.

The sensor unit 20 may include a wheel speed sensor, a steering angle sensor, a pressure sensor, a force sensor, a Hall sensor, and the like. A wheel speed sensor is mounted on each wheel to detect the rotational speed of the wheel. The steering angle sensor is mounted on the steering wheel of the vehicle to sense the steering speed, steering direction, and steering angle of the steering wheel. The force sensor detects the tension of the parking cable. The Hall sensor detects the number of revolutions of the EPB drive motor.

The EPB actuator 30 provides parking braking force to each wheel.

The EPB actuator 30 includes a drive motor that moves the electronic parking brake (EPB) in the EPB system. For example, the EPB may be a cable puller method, and the cable puller method refers to an operation method of a parking brake that provides or releases braking force to a vehicle using the tension of a parking cable.

The ESC actuator 40 adjusts the hydraulic pressure supplied to the wheel cylinders of each wheel.

The ESC actuator 40 includes a solenoid valve and a drive motor for driving a pump that pumps hydraulic pressure in the ESC system.

The ESC actuator 40 closes or opens the solenoid valve and controls the hydraulic pressure supplied to the wheel cylinders of each wheel by driving the ESC driving motor.

The ESC actuator 40 maintains the stability of the vehicle by controlling the posture of the vehicle by applying a braking force to the inner or outer wheels when understeer or spin occurs in the vehicle, and automatically decelerates just before the spin limit.

Communication between the integrated ECU 10 , the sensor unit 20 , the EPB actuator 30 and the ESC actuator 40 is a LIN (Local Interconnect Network), CAN (Controller Area Network), FlexRay, MOST (Media) Oriented Systems Transport), etc., may be composed of various types of multiple network buses.

The integrated ECU 10 automatically operates or releases the parking brake of the vehicle by controlling the EPB actuator 30 to perform parking brake of the vehicle. Looking at the parking braking operation, first, when the EPB driving motor is driven in one direction in the integrated ECU 10 , the cable driving gear operates. The actuation of the cable drive gear pulls the parking cable and provides braking force to the vehicle. The parking cable is tensioned by the EPB drive motor. On the other hand, when the cable drive gear operates in the opposite direction with the other one-way drive of the EPB drive motor and the parking cable is released, the braking force provided to the vehicle is released.

The integrated ECU 10 consists of a single ECU. The integrated ECU 10 may control the EPB actuator 30 and the ESC actuator 40 . The integrated ECU 10 controls the operation of the ESC actuator 40 based on the state information of the vehicle.

The integrated ECU 10 controls the EPB actuator 30 to generate parking braking force for each wheel, and controls the ESC actuator 40 to adjust the braking hydraulic pressure supplied to the wheel cylinders of each wheel.

The integrated ECU includes a micro controller unit (MCU) 11 , an H-BRIDGE circuit unit 12 , an application-specific integrated circuit (ASIC) 13 , a built-in YAW&G sensor 14 , and a sensor interface unit 15 .

The H-BRIDGE circuit unit 12 is communicatively connected to the MCU 11 and SPI (Serial Peripheral Interface). SPI communication is a synchronized serial communication and supports communication between a master microcomputer and a slave microcomputer through a normal 4-wire serial bus.

The H-BRIDGE circuit unit 12 drives the EPB actuator 30 according to the control signal of the MCU 11 .

The H-BRIDGE circuit unit 12 is a circuit capable of changing the direction of a voltage applied to the EPB driving motor with a single power supply. By changing the direction of the voltage by the H-BRIDGE circuit unit 12, the EPB driving motor can be rotated forward or reversed. The EPB driving motor applies or releases tension to the parking cable by rotating forward or reverse by the H-BRIDGE circuit unit 12 .

The ASIC 13 is communicatively connected to the MCU 11 and SPI (Serial Peripheral Interface).

The ASIC 13 drives the ESC actuator 40 according to the control signal of the MCU 11 .

The ASIC 13 is an application-specific integrated circuit that is designed from scratch according to the user's order, arranging several basic gates, or pre-configuring basic components such as counters, timers, and flip-flops on the chip. It is a semiconductor IC (Integrated Circuit) that allows the product to be miniaturized.

The ASIC 13 supplies driving power to the built-in YAW&G sensor 14 .

The built-in YAW&G sensor 14 is connected to the MCU 11 so as to communicate with the SPI (Serial Peripheral Interface).

The built-in YAW&G sensor 14 detects a yaw rate and acceleration (at least one of longitudinal acceleration Ax and lateral acceleration Ay) of the vehicle according to a control signal of the MCU 11 . The built-in YAW&G sensor 14 transmits the detected yaw rate and acceleration information to the MCU 11 using SPI communication with the MCU 11 . In this way, by integrating the ECU and the YAW&G sensor into one, it is possible to eliminate the duplication of hardware such as the electronic control unit, and to reduce the electrical wiring, thereby simplifying the vehicle wiring harness, reducing the size and weight, and reducing the manufacturing cost and cost. Power consumption can be reduced.

The sensor interface unit 15 processes the detection signals output from the sensor unit 20 and transmits them to the MCU 11 .

3 is a view for explaining the operation of the integrated electronic control unit of the integrated electronic control system according to an embodiment of the present invention.

Referring to FIG. 3 , the MCU 11 receives vehicle state information detected by the sensor unit 20 from the sensor interface unit 15 .

In addition, the MCU 11 receives the vehicle yaw rate and acceleration information from the built-in YAW&G sensor unit 14 .

The MCU 11 outputs a control signal for operating the H-BRIDGE circuit unit 12 and the ASIC 13 based on the received vehicle state information, yaw rate and acceleration information.

That is, during EPB control, the MCU 11 outputs a first driving signal to the H-BRIDGE circuit unit 12 so that the H-BRIDGE circuit unit 12 drives the EPB actuator 30 . When controlling the ESC, the MCU 11 outputs a second driving signal to the ASIC 13 so that the ASIC 13 drives the ESC actuator 40 .

10: integrated ECU 11: MCU
12: H-BRIDGE circuit part 13: ASIC
14: built-in YAW&G sensor unit 15: sensor interface unit
20: sensor unit 30: EPB actuator
40: ESC actuator

Claims (3)

a sensor unit configured to detect vehicle state information including a wheel speed and a steering angle of the vehicle;
EPB actuators that provide parking braking force to each wheel;
an ESC actuator for controlling the hydraulic pressure supplied to the wheel cylinders of each wheel; and
an integrated ECU that controls the EPB actuator to generate parking braking force for each wheel, and controls the ESC actuator to adjust the braking hydraulic pressure supplied to the wheel cylinder of each wheel;
The integrated ECU is
a sensor interface unit providing a communication interface with the sensor unit;
an H-BRIDGE circuit for driving the EPB actuator;
an ASIC that drives the ESC actuator;
a built-in YAW&G sensor for detecting the yaw rate and acceleration of the vehicle; and
The vehicle state information detected through the sensor unit is received through the sensor interface unit, and the yaw rate and acceleration information of the vehicle detected through the built-in YAW&G sensor unit is received through an internal communication bus, and the received vehicle state information, An MCU for outputting a control signal for operating the H-BRIDGE circuit unit and the ASIC based on the yaw rate and acceleration information,
The built-in YAW&G sensor unit is connected to the ASIC to receive driving power from the ASIC,
The built-in YAW&G sensor unit is connected to the MCU, performs Serial Peripheral Interface (SPI) communication with the MCU, and transmits the detected yaw rate and acceleration to the MCU through the SPI communication. delete delete

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