KR20070035129A - Method for reducing dark current in the electronic unit of vehicle - Google Patents

Abstract

The present invention relates to a method for minimizing dark current of an automotive electric unit.

That is, the present invention is an electronic device including a CAN communication controller, a microcomputer and a bus transceiver communicating with each other by a CAN (Controller Area Network) bus (CAN), the data input and output between each electronic unit with the start-up of the vehicle If there is no signal, it is to provide a method of minimizing the dark current of the automotive electronics unit to minimize the level of dark current by automatically adjusting the voltage level of the voltage regulator included in each electrical unit for battery discharge. .

Dark Current, Electric Unit, CAN Communication, Micom, Bus Transceiver

Description

Method for reducing dark current of automotive electronics unit {Method for reducing dark current in the electronic unit of vehicle}

1 is a system diagram illustrating a method of minimizing dark current in an electric equipment unit for an automobile according to the present invention;

Figure 2 is a circuit diagram for realizing a dark current minimizing method of the automotive electric unit according to the present invention.

<Explanation of symbols for the main parts of the drawings>

10: Controller for can communication

12: Micom

14: bus transceiver

16: voltage regulator

18: INH terminal

The present invention relates to a method for minimizing dark current of an automotive electronics unit, and more particularly, in each electronics unit communicating with each other by a CAN (Controller Area Network) bus and controlling the electronics of the vehicle, The present invention relates to a method for minimizing dark current of an automotive electric unit, in which there is no data input / output signal between each unit with a start-off, so that the voltage level of the voltage regulator is automatically adjusted to minimize the dark current for battery discharge.

In general, in an electric device that uses electricity, turning off the system turns off the power related to the basic operation of the device, but when the power is turned on again later, the operation is made immediately and the basic operation of the electric device is continuously performed. The current is supplied to various controllers for the purpose of this, and this current is called dark current.

For example, a transmission device of a vehicle may include a transmission control unit (TCU) according to a driving condition of a vehicle instead of a driver's shift lever in a manual transmission in which the driving speed and torque of the vehicle are changed according to the driver's shift lever operation. Is replaced by an automatic transmission that changes the speed and torque of the car.

In addition, the braking device of the vehicle brakes the vehicle according to various driving information of the driving vehicle in addition to the driver's brake pedal operation through the ABS (anti brake system) that simply brakes the vehicle only by the driver's brake pedal operation. To improve the stability.

In addition, in recent years, the vehicle is driven by ultra-thin combustion through a gasoline direct injector (GDI) engine for high power, high fuel consumption, and reduction of exhaust gas. Unlike the opening rate of the throttle valve is adjusted accordingly, the amount of intake air is controlled by controlling the opening rate of the throttle valve according to vehicle driving information through an electronic throttle controller (ETC) to suppress the sudden change of engine torque when the air-fuel ratio is switched. .

Such an electronic control device such as TCU, ABS, ETC, etc., provides various driving information of the vehicle required for operating each system by means of a can high communication line and a can low communication line with an engine control unit (ECU). Receive via can communication.

On the other hand, when the vehicle is stopped, the current flow from the battery to the various accessories such as the starter and the radio is interrupted, but the current of the battery continues to be supplied to the devices such as the controllers and the like for supplying the current for immediate starting. To be supplied.

Therefore, the battery current is completely consumed by the above-described dark current when transported for a long time after the vehicle is produced and before delivery to the customer or when the vehicle is not used for a long time. The battery may become weak and cause problems.

In order to solve this problem, if the car is not used for a long time, a method of artificially shorting the connection state of the battery may be used. However, this method has a lot of troubles of opening the vehicle bonnet and removing the battery. This is not possible if the vehicle must be handled, and mishandling of the battery's electrodes (-poles) can cause a variety of other problems.

Therefore, in a vehicle, after the vehicle is turned off, a fuse is installed in the middle of a circuit in which battery current is supplied to various devices such as various controllers to check an abnormality of the current supplied to the electric device. In case the vehicle is not used for a long time, the fuse is separated from the terminal of the fuse box to prevent the generation of dark current. This is the cause of the increase in cost because the additional fuse is installed in each controller. It causes a big drop in sex.

SUMMARY OF THE INVENTION The present invention has been made in view of the above, and includes a CAN communication controller, a microcomputer, and a bus transceiver communicating with each other by a CAN (Controller Area Network) bus, wherein the vehicle is started. When there is no data input / output signal between each electric unit with off, the electric equipment unit for the electric vehicle that the voltage level of the voltage regulator included in each electric unit is automatically lowered for battery discharge, minimizing the level of dark current. Its purpose is to provide a method for minimizing dark current.

The present invention for achieving the above object is a microcomputer comprising a controller for can communication, a bus transceiver for transmitting and receiving data signals to and from the microcomputer (Bus Transceiver), and connected to a battery to maintain the required voltage of the micom constant An electrical unit comprising a voltage regulator, comprising: providing an INH (Inhibit) terminal to the bus transceiver to enable signal transmission to the voltage regulator, and additionally inputting a sleep mode to the micom; After the start-off, if the reception of the various driving information data applied through the CAN high communication line CAN-H and the CAN low communication line CAN-L is not detected by the CAN communication controller, the sleep mode command signal of the microcomputer is displayed. Transmitted to the bus transceiver; Sending a voltage drop signal for a sleep mode to the voltage regulator at the bus transceiver; The voltage level of the voltage regulator is adjusted downward, thereby minimizing the dark current flowing from the battery to the electric field unit provides a method for minimizing the dark current of the automotive electric unit.

In a preferred embodiment, the dark current is adjusted to 20 to 30 mA per unit length for immediate operation of the unit after starting the vehicle.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a system diagram illustrating a method for minimizing dark current of an automotive electric unit according to the present invention, and FIG. 2 is a circuit diagram for realizing a method for minimizing dark current of an automotive electric unit according to the present invention.

The present invention is intended to prevent the discharge of the battery by minimizing the flow of dark current to the electric field unit including the CAN communication controller and the microcomputer and the bus transceiver communicating with each other by the CAN bus after the vehicle is turned off. The point is the point.

That is, in the present invention, when there is no data input / output signal due to can communication between each electric power unit with the start-off of the vehicle, the voltage level of the voltage regulator included in each electric power unit is automatically adjusted to minimize the level of dark current. It was made to be possible.

To this end, as shown in FIG. 1 and FIG. 2, the bus transceiver includes an INH (Inhibit) terminal for signal transmission to a voltage regulator, and a sleep mode, which is a mode for minimizing dark current, is additionally added to the microcomputer. Save the input.

As described above, each electric field unit of a vehicle (especially a large bus) includes a microcomputer 12 including a can communication controller 10 and a bus transceiver 14 which transmits and receives input / output data signals to and from the microcomputer 12. And a voltage regulator 16 connected to a battery to maintain a constant voltage of the microcomputer 12. An INH (Inhibit) terminal 18 is connected to the bus transceiver 14. It is connected to the voltage regulator 16 so that the signal can be transmitted, the microcomputer 12 additionally stores a sleep mode that is a mode for minimizing dark current, and stores the sleep mode command signal to the bus transceiver 14 Allow to transmit.

Therefore, if the reception of various driving information data applied through the CAN high communication line CAN-H and the CAN low communication line CAN-L is not detected by the CAN communication controller 10 after the vehicle is turned off, The sleep mode command signal (12) is transmitted to the bus transceiver (14).

Normally, electronic control units such as TCU, ABS, ETC, etc., operate a system through can communication using two lines, an engine control unit, a can high communication line (CAN-H) and a can low communication line (CAN-L). Receiving various driving information of the car for the example will be described as follows.

As an example, the TCU receives various driving information necessary for shift control of the vehicle through the CAN control unit and the CAN control unit using the CAN high communication line (CAN-H) and the CAN low communication line (CAN-L), and receives the received driving information. Shift control is performed to control the driving speed, engine torque, etc. of the vehicle according to the information.

As another example, when the driver presses the brake pedal to brake the vehicle while the vehicle is in operation, the ABS is connected to the engine control unit using the can high communication line (CAN-H) and the can low communication line (CAN-L). By receiving various driving information such as driving speed, wheel speed, and wheel speed of the vehicle according to the driver's brake pedal operation, and controlling the brake pressure required for braking the vehicle according to the received driving information, Ensuring safe driving of the car by ensuring driving stability and steering even under road conditions.

As another example, an automobile equipped with a GDI engine realizes high engine output, high fuel efficiency, and reduced exhaust gas by ultra-thin combustion. In this GDI engine, the throttle valve is opened according to a conventional driver's accelerator pedal operation. Unlike adjusting the rate, the ETC receives the driving information of the vehicle through the can communication with the engine control unit using the CAN high communication line (CAN-H) and the can low toe line (CAN-L). In order to suppress sudden fluctuations in engine torque, the amount of intake air is controlled by controlling the throttle valve opening rate according to the driving information received through the can communication.

As described above, various electric vehicle units receive various driving information of the vehicle for operating the system through can communication with each other while the vehicle is running.

Since the driving information data exchange by the can communication is not performed after the vehicle is turned off, if the driving information data is not detected by the can communication controller 10 after the start-off, the sleep mode command signal is received by the microcomputer 12. Is transmitted to the bus transceiver 14.

Subsequently, a voltage drop signal for the sleep mode is transmitted to the voltage regulator 16 through the INH terminal 18 of the bus transceiver 14.

Thus, the voltage level of the voltage regulator 16 is adjusted downward, thereby minimizing dark current flowing from the battery to the electric field unit.

At this time, the voltage adjustment level of the voltage regulator 16 is adjusted downward, the downward adjustment range is adjusted so that the dark current flows about 20 ~ 30㎂ to each electric field unit for immediate operation of the electric unit after the vehicle starts. .

As described above, according to the method of minimizing the dark current of the automotive electronics unit according to the present invention, a vehicle communication unit comprising a CAN communication controller, a microcomputer and a bus transceiver communicating with each other by a CAN bus, When there is no input / output signal of driving information data between each electric unit with start-off of, the voltage level of the voltage regulator included in each electric unit is automatically adjusted to minimize the level of dark current and accordingly Discharge can be prevented.

Claims (2)

In the electric field unit including a microcomputer including a CAN communication controller, a bus transceiver for transmitting and receiving data signals to and from the microcomputer, and a voltage regulator connected to a battery to maintain a constant voltage of the microcomputer. , Providing an INH (Inhibit) terminal to the bus transceiver to enable signal transmission to the voltage regulator, and additionally inputting a sleep mode to the microcomputer to minimize dark current; After the start-off, if the reception of the various driving information data applied through the CAN high communication line CAN-H and the CAN low communication line CAN-L is not detected by the CAN communication controller, the sleep mode command signal of the microcomputer is displayed. Transmitted to the bus transceiver; Sending a voltage drop signal for a sleep mode to the voltage regulator at the bus transceiver; The voltage level of the voltage regulator is adjusted downward, so that the dark current flowing from the battery to the electric field unit is minimized. The method of claim 1, wherein the dark current is adjusted to 20 to 30 mA per electric field unit for immediate operation of the electric field unit after the vehicle is started.

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