KR100721111B1 - Circuit for determining status and fault diagnosis of three state switch - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a state discrimination and fault diagnosis circuit of a three-phase switch of a vehicle, comprising six contacts, and outputting a logic signal through an operation of pulling or pushing to a specific one of the contacts. Switch module unit; A signal discrimination holding unit which sequentially outputs signals to the switch module unit and the monitoring unit, respectively, and outputs a signal only to a specific contact point when a signal discrimination maintaining signal is input; A monitoring unit which receives a signal output from the switch module unit and the signal discrimination holding unit and detects whether there is a duplicate combination signal and outputs a detection signal or a combination signal accordingly; And a micro control unit (MCU) configured to perform system control according to the combined signal input from the monitoring unit or to output a control signal for maintaining signal discrimination to the signal discrimination maintaining unit according to a detection signal. In the event of a contact failure, it is possible to determine the current switch state through a combination of other contacts, preventing the system's inoperability, and monitoring the state of the switch in real time so that the user can take action when an error occurs. It works.

3-phase switch, logic signal, fault diagnosis

Description

Status discrimination and fault diagnosis circuit of three-phase switch {CIRCUIT FOR DETERMINING STATUS AND FAULT DIAGNOSIS OF THREE STATE SWITCH}

1 is a circuit diagram showing an example of the configuration of a three-phase switch of a conventional vehicle.

2 is a truth table according to FIG.

Figure 3 is a block diagram showing a brief configuration of the status determination and fault diagnosis circuit of the three-phase switch according to an embodiment of the present invention.

4 is a circuit diagram showing a configuration of a switch module unit according to an embodiment of the present invention.

5 is a truth table showing the operation of the three-phase switch in accordance with an embodiment of the present invention.

*** Description of the main parts of the drawing ***

100: switch 110, 500: microcontroller (MCU)

200: switch module 210 ~ 260: switch

300: signal discrimination holding unit 400: monitoring unit

The present invention relates to the status discrimination and fault diagnosis circuit of a three-phase switch of a vehicle. In particular, by using a three-phase switch having six multi-contacts, it is possible to determine the status of a switch regardless of a specific contact failure. In the event of a fault, the circuitry provides the user with the information.

Many modern vehicles include memory settings for motor drives, such as side view mirrors. When the drive selects a memory setting, the microcontroller MCU sets the mirrors to a stored angle already selected for the drive. The mirrors can also be adjusted manually using a switch, which is typically a joystick. Each mirror includes a motor that adjusts the mirror angle up and down and a motor that adjusts the mirror angle from side to side. Each motor has a common input common to all motors and a motor input that can be used to control each motor. The common input can be low (lean right or down), high (lean left or top) or open circuit (no operation).

To coexist with the memory function, the switch is an input to a microcontroller (MCU) or other digital level logic device. When the switch is high or low, it indicates manual adjustment and the microcontroller (MCU) will not move the mirror by the memory setting. The microcontroller (MCU) will adjust the mirror by memory setting only when the manual switch is in the open circuit position. Since the microcontroller (MCU) receives only binary inputs, the analog-to-digital converter typically connected to the voltage divider circuitry is a binary that can read a three-phase switch (high, low, open) by the microcontroller (MCU). Convert to output However, this method requires the addition of expensive analog / digital converters.

FIG. 1 is a circuit diagram showing an example of a configuration of a three-phase switch of a conventional vehicle, and FIG. 2 is a truth table according to FIG. 1, and as shown therein, the switch is pull-neutral- * push. It has three phases, and in normal operation, each phase cannot occur mechanically. Ⓐ and ⓑ switch inputs are pulled up to the power supply voltage Vcc to maintain a stable state in order to prevent noise or malfunction in case of no signal, and the resistors Ra, R1, R2 and resistors Rb, The combination of R3 and R4 causes a logic low (0) / high (1) to occur when the pull / push contact opens and closes.

However, in the related art, it merely serves to transfer a user's command to 0, 1, which is an electrical signal, and transmits it to the system, and thus there is no countermeasure when a switch contact occurs. For example, if the pull or push contacts remain stuck, the microcontroller (MCU) can cause a malfunction even if the user has not issued a pull or push action command, whereas the pull or push contacts fail or are in the middle. There is a problem such that the contact does not stick even when the user is issued a pull or push operation command due to the inflow of impurities, making it impossible for the user to perform a desired operation.

Therefore, the present invention was devised to solve the above-mentioned conventional problems, and by using a three-phase switch having six multi-contacts, it is possible to determine the state of the switch regardless of whether a specific contact is broken or not. The purpose is to provide a device for providing the information to the user.

In order to achieve the above object, the state discrimination and fault diagnosis circuit of the three-phase switch of the present invention includes six contacts, and outputs a logic signal through a pull or push operation to a specific one of the contacts. A switch module unit; A signal discrimination holding unit which sequentially outputs signals to the switch module unit and the monitoring unit, respectively, and outputs a signal only to a specific contact point when a signal discrimination maintaining signal is input; A monitoring unit which receives a signal output from the switch module unit and the signal discrimination holding unit and detects whether there is a duplicate combination signal and outputs a detection signal or a combination signal accordingly; And a micro controller (MCU) for performing system control according to the combined signal input from the monitoring unit or outputting a control signal for maintaining the signal discrimination to the signal discrimination maintaining unit according to the detection signal.

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

FIG. 3 is a block diagram illustrating a configuration of a status discrimination and failure diagnosis circuit of a three-phase switch according to an exemplary embodiment of the present invention. As shown in FIG. 3, six contacts (ⓐ, ⓑ, ⓒ, ⓓ, ⓔ, ⓕ And a switch module unit 200 for outputting a logic signal to the monitoring unit 400 through a pull or push operation to a specific one of the contacts; The signal is sequentially output to the switch module 200 and the monitoring unit 400 according to the control of the microcontroller (MCU, 500), and when a control signal for maintaining the signal discrimination is input, the signal is transmitted only to a specific contact point. A signal discrimination holding unit 300 for outputting; It receives the signals output from the switch module unit 200 and the signal discrimination holding unit 300 and detects whether there is a duplicate combination signal, and outputs a detection signal if there is a duplicate signal, and outputs a combination signal if there is no duplicate signal. Monitoring unit 400; And a micro controller (MCU, 500) which performs system control according to the combined signal input from the monitoring unit 400 or outputs a control signal for maintaining the signal discrimination to the signal discrimination maintaining unit 300 according to the detection signal. It consists of.

The switch module unit 200 is a combination of six contacts (ⓐ, ⓑ, ⓒ, ⓓ, ⓔ, ⓕ) so as not to overlap each other, the switch 240 to 260 for the push operation and the switch for the pull operation ( 210 to 230 are interlocked with each other. For example, as shown in FIG. 4, when the switches 210 to 230 which are pull-operated all switch to the upper contact point according to the pull operation, the other switches also switch to the upper contact point, and push the switch. The switches 240 to 260 which operate are similarly operated.

The monitoring unit 400 includes a field effect transistor (FET) for outputting a pull-up signal when a duplicate combination signal is detected.

The signal discrimination holding unit 300 is configured by three field effect transistors (FETs) and is turned on according to a control signal of the microcontroller (MCU) 500.

Referring to the drawings the operation of the embodiment of the present invention configured as described above is as follows.

5 is a truth table showing the operation of the three-phase switch in accordance with an embodiment of the present invention, as shown in the pull-up of the power supply voltage (Vcc) to the switch 210 to 230, the pull operation in the switch module unit 200 The pull-down signal of the up-up signal and the ground (GND) is applied, and the switches 240 to 260 performing a push operation apply the signal of the signal discrimination holding unit 300. The signal discrimination holding unit 300 receives a control signal from the microcontroller (MCU) 500 and sequentially turns on three FETs to output a high signal, and a signal and a signal of the switch module unit 200. The high signal of the determination holding unit 300 is input from the monitoring unit 400 to detect whether there is a duplicate signal and outputs a detection signal to the microcontroller (MCU, 500). According to the switching operation of the four switches, the total possible combination is '36'. That is, '36' is a value obtained by multiplying the switch state (push, pull, neutral) by the number of contact failures (6 contacts * 2 failure modes (contact stuck, unable to contact)).

For example, in more detail, in the state in which the switches 240 to 260 are switched to the upper or lower contact in the state in which the switches 210 to 230 of the switch module 200 are switched to the upper or lower contact, FIG. 5. As shown in the truth table of one of the four logic level signals of 000, 100, 010, 001 is output, if one of the switches (210 ~ 230) is the contact stuck or disabled contact is a signal Instead, two duplicated signals are output, and the monitoring unit 400 detects them and outputs a detection signal to the microcontroller (MCU) 500. That is, when the signal discrimination holding unit 300 outputs a signal to the switch 260, the switch 210 outputs a logic high signal and the other two switches 220 and 230 output a logic low signal. If the switch 230 is switched to the lower contact due to the contact fixing, the logic high signal is output. Accordingly, the monitoring unit 400 receives a duplicate logic high signal and outputs a detection signal according to the microcontroller (MCU) 500.

The microcontroller (MCU) 500 determines that an abnormality has occurred in the switch 230 when the detection signal is input, and outputs a control signal to the signal discrimination holding unit 300. Accordingly, the signal discrimination maintaining unit ( 300 outputs a signal by turning on only the FET connected to the switch 250 among the three FETs, and the switch module unit 200 switches the switches 210 and 220 to the lower contact point, thereby eventually switching 210. Only the logic high signal is output.

If, on the contrary, a failure occurs in the switch 240 among the push switches 240 to 260, the switching of each switch and the turn-on of the FET are controlled as described above to maintain the signal discrimination operation. .

In addition, the micro-control unit (MCU, 500) outputs a control signal to the signal discrimination holding unit 300 and also informs the driver that an abnormality has occurred in a specific switch through a warning lamp.

As described above, the status determination and fault diagnosis circuit of the three-phase switch of the present invention prevents the operation of the system by determining the current state of the switch through a combination of other contacts in the event of a failure of the contacts in the switch. In addition, the status of the switch can be monitored in real time so that the user can take action when an abnormality occurs.

Claims (4)

A switch module unit having six contacts and outputting a logic signal through an operation of pulling or pushing to a specific one of the contacts; A signal discrimination holding unit which sequentially outputs signals to the switch module unit and the monitoring unit, respectively, and outputs a signal only to a specific contact point when a signal discrimination maintaining signal is input; A monitoring unit which receives a signal output from the switch module unit and the signal discrimination holding unit and detects whether there is a duplicate combination signal and outputs a detection signal or a combination signal accordingly; And The micro-phase control unit (MCU) is configured to perform system control according to the combined signal input from the monitoring unit or output a control signal for maintaining signal discrimination to the signal discrimination maintaining unit according to the detection signal. Status discrimination and troubleshooting circuit. The method of claim 1, wherein the switch module unit A status discrimination and fault diagnosis circuit for a three-phase switch characterized in that a plurality of six contacts are combined so as not to overlap and a plurality of switches are interlocked. The method of claim 1, wherein the monitoring unit And a field effect transistor (FET) for outputting a pull-up signal when a redundant combination signal is detected. The method of claim 1, wherein the signal discrimination holding unit A state discrimination and fault diagnosis circuit of a three-phase switch comprising a plurality of field effect transistors (FETs).

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