KR19980053739U - Communication device between inspection device and electronic control device - Google Patents

Abstract

When the L line is in a high state, it transmits and receives data through the K line, and in the low state it relates to a communication device between the check device and the electronic control device to provide information to the driver by sending a fault signal output to the same port, First and second filtering means for removing various noises introduced from the outside, first dividing means for dividing the potential of the signal output from the K line and outputting the signal as a predetermined authority signal, and the signal of the first dividing means. A first switching means switched according to the first switching means, a second switching means switched according to the signal of the first switching means, signal inverting means for inverting a signal output from the data transmitting end, and a signal switching means. A third switching means, a fourth switching means switched in accordance with a signal of a data transmitting end, and a switch in accordance with a signal of the fourth switching means. A fifth switching means and a second voltage dividing means for dividing the signal of the fifth switching means to maintain a high line during communication and a low line when outputting a fault signal. The data transmitter is used for both K line communication and fault signal output so that only five CPU ports can be used.

Description

Communication device between inspection device and electronic control device

The present invention relates to a communication device between the inspection device and the electronic control device. More specifically, when the L line is in a high state, data is transmitted and received through the K line. A communication device between an inspection device and an electronic control device that sends information to a driver is sent.

In general, the communication between the electronic control device and the inspection device is to perform data communication through a communication cable line according to the GST protocol.

The above data communication is installed at any position in the vehicle to detect the failure of the vehicle and receive the contents stored in the electronic control device as mutually promised data through the input / output device as shown in FIG. The user and the maintenance company can see the naked eye so that the maintenance of the exact trouble spot can be done easily.

Since the conventional apparatus as described above is configured with a communication-related circuit using six CPU ports, it is inevitable to replace the CPU or to redesign the circuit to add necessary functions in the future, and also there is a problem of insufficient memory.

The present invention has been devised to solve the above problems. The purpose of the present invention is to maintain high when communicating and to maintain low when outputting a fault signal. It also serves as the output signal output so that only five CPU ports can be used.

In order to achieve the above object, the present invention, the first and second filtering means for removing various kinds of noise introduced from the outside, and the first to divide the potential of the signal output from the K line to output a signal of a certain authority A voltage dividing means, first switching means switched in accordance with a signal of the first voltage dividing means, second switching means switched in accordance with a signal of the first switching means, and signal inverting means for inverting a signal output from the data transmitting end. And third switching means switched according to the signal of the signal inverting means, fourth switching means switched in accordance with the signal of the data transmitting end, fifth switching means switched in accordance with the signal of the fourth switching means, and And second dividing means for dividing the signal of the fifth switching means.

1 is a detailed circuit diagram showing an embodiment according to the communication device between the inspection device and the electronic control device,

2 is a detailed circuit diagram showing a communication device between a conventional inspection device and an electronic control device.

Explanation of symbols on the main parts of the drawings

20, 90: partial pressure part 30: first switching part

40: second switching unit 50: inverter

60: third switching unit 70: fourth switching unit

80: fifth switching unit C10, C100: capacitor

Hereinafter, a preferred embodiment according to the present invention with reference to the accompanying drawings as follows.

As can be seen in Figure 1 a preferred embodiment according to the present invention is a capacitor (C10, C100), voltage dividers (20, 90), the first, second, third, fourth, fifth switching unit ( 30, 40, 60, 70, 80), and an inverter 50.

One end of the first capacitor C10 is grounded to the case, and the other end of the first capacitor C10 is connected to the K line, and removes various noises introduced from the outside.

The first voltage dividing unit 20 is connected to the Zener diode ZD having the resistor R21 and the anode terminal grounded in parallel, and divides the potential of the signal output from the K line by the Zener diode ZD which is a constant voltage diode. Output as a signal of constant potential.

In the first switching unit 30, the resistor R31 is connected to the voltage divider and the emitter stage in which the resistor R32 is connected in parallel, and the diode D and the capacitor (D) are connected to the base and emitter terminals. C33 is formed of a PNP transistor TR34 connected in parallel, and is switched according to the signal of the first voltage dividing unit 20 to output a predetermined signal.

The second switching unit 40 has a base end connected to the first switching unit 30 through a resistor R41 and a collector end connected to the power supply terminal V through one pull-up resistor R44. It is connected to the receiving end and the emitter stage is grounded, the emitter stage and the base terminal is composed of an NPN transistor TR43 connected via a resistor (R42), it is switched in accordance with the signal of the first switching unit 30 and accordingly Output a predetermined signal.

The inverter 50 inverts and outputs the signal output from the data transmission end.

The third switching unit 60 has a base end connected to the inverter 50 through a voltage divider in which a resistor R61 and a resistor R62 are connected in parallel, an emitter stage is grounded, and a collector stage is connected to the first partial pressure. An NPN transistor TR63 connected to the connection terminal of the unit 20 and the first switching unit 30 is switched according to the signal of the inverter 50 to output a predetermined signal.

The fourth switching unit 70 includes an NPN transistor TR73 having a base end connected to a data transmitting end through a resistor R71, and a base end and a collector end connected to a resistor R72, according to a signal of the data transmitting end. It is switched to output a predetermined signal accordingly.

The fifth switching unit 80 has a base terminal connected to a collector terminal of the fourth switching unit 70 NPN transistor TR73 through a resistor R81, and an emitter terminal connected to a power supply terminal V and The terminal and base are formed of a PNP transistor TR83 connected by a resistor R82, and are switched according to the signal of the fourth switching unit 70 to output a predetermined signal.

The second voltage dividing unit 90 is connected to the resistor R91 and the resistor R92 in parallel and connected to the collector terminal of the fifth switching unit 80 and the PNP transistor TR83. The fifth switching unit 80 ) The signal potential is divided and output.

One end of the second capacitor C100 is grounded to the case, and the other end of the second capacitor C100 is connected to the L line to remove various noises introduced from the outside.

Referring to the preferred embodiment according to the present invention configured as described above in detail according to the operation process as follows.

The L line remains high when communicating between the fault checker and the electronic controller, and low when outputting a fault signal.

In the above L line is a capacitor (C1) is grounded to the case to block the inflow of noise, a constant voltage unit connected in parallel with the diode (D1) and the diode (D2), and one side pull-up resistor (connected to the power supply terminal (V) R1), a second capacitor C2 which is grounded at one end thereof to remove noise from the signal of the constant voltage unit, and one end thereof is connected to the receiving end via a resistor R2 to invert the signal of the second capacitor C2. It consists of an inverter (1).

When the L line maintains high communication and the K line transmits data When the K line outputs a predetermined signal, that is, for example, when the L line outputs a high signal, the first voltage divider 20 receives a signal. The potential of is divided and output as a signal of a constant potential by the zener diode ZD which is a constant voltage diode.

In this case, the first capacitor C10 removes various noises introduced from the outside.

Then, when the signal of the first voltage dividing unit 20 is applied to the base terminal of the PNP transistor TR34 of the first switching unit 30 through a voltage divider in which the resistor R31 and the resistor R32 are connected in parallel, the first switching is performed. The base end of the PNP transistor TR34 of the unit 30 is switched off while maintaining a high potential.

At the same time, since the NPN transistor TR43 of the second switching unit 40 is also turned off, the second switching unit 40 outputs a high signal by a pull-up resistor R44 having one end connected to the power supply terminal V. To the receiver.

In addition, when the K line outputs a low signal, the low signal is applied to the data receiving end to transmit the data signal.

In contrast to the above, when the L line is kept high and the K line receives the data signal, when the data transmitter outputs a high signal, the inverter 50 inverts the signal output from the data transmitter and outputs a low signal. .

Then, since the NPN transistor TR63 is switched off due to the low signal of the inverter 50 applied through the voltage divider connected in parallel with the resistor R61 and the resistor R62, the third switching unit 60 maintains the switching-off state. The line remains high.

Unlike the above, when the data transmitter outputs a low signal, the NPN transistor TR63 is switched on according to the above operation, so the K line maintains the low signal.

Therefore, the K line receives the signal of the data transmitting end by the above operation.

However, when the L line is kept low and outputs a fault signal, when the fault signal is output from the data transmission terminal, for example, when a high signal is output, the NPN transistor TR73 of the fourth switching unit 70 is switched on. Output a high signal.

At the same time, since the low potential is formed at the base terminal of the PNP transistor TR83 of the fifth switching unit 80, the second voltage dividing unit 90 in which the high signal is turned on in parallel with the resistor R91 and the resistor R92 is formed. ) To the fault signal output terminal.

In this case, the second capacitor C100 removes various noises introduced from the outside.

Even when the data transmitter outputs the low signal, the low signal is output to the fault signal output terminal by the above operation.

As such, the present invention utilizes the characteristics of the L line, which maintains high when communicating and low when outputting a fault signal, so that the data transmission terminal of the K line serves as the K line communication and the fault signal output, so that only five ports of the CPU are used. Make it available.

Claims (7)

A communication device between an inspection device and an electronic control device, comprising: first and second filtering means for removing various noises introduced from the outside, and a first for dividing a potential of a signal output from a K line and outputting the signal as a predetermined authority signal. A voltage dividing means, first switching means switched in accordance with a signal of the first voltage dividing means, second switching means switched in accordance with a signal of the first switching means, and signal inverting means for inverting a signal output from the data transmitting end. And third switching means switched according to the signal of the signal inverting means, fourth switching means switched in accordance with the signal of the data transmitting end, fifth switching means switched in accordance with the signal of the fourth switching means, and And a second voltage dividing means for dividing a signal of the fifth switching means. The communication device according to claim 1, wherein the first voltage dividing means is connected in parallel with a resistor (R21) and a Zener diode (ZD) having an anode terminal grounded in parallel. According to claim 1, wherein the first switching means is a resistor (R31) is connected to the power supply terminal (V) and the voltage divider and the emitter stage in which the resistor (R32) is connected in parallel, the diode (D) ) And a communication device between the control device and the electronic control device, characterized in that the capacitor (C33) consists of a PNP transistor (TR34) connected in parallel. The method of claim 1, wherein the second switching means has a base end is connected to the first switching means via a resistor (R41), the collector end is connected via a pull-up resistor (R44), one end is connected to the power supply terminal (V). And an NPN transistor (TR43) connected to the receiving end, the emitter end being grounded, and the emitter end and the base end connected via a resistor (R42). The method according to claim 1, wherein the third switching means is connected to the signal conversion means, the emitter stage is grounded, the collector stage is the base end is connected to the resistor R61 and the resistor R62 in parallel And a NPN transistor (TR63) connected to the connection terminal of the first voltage dividing means and the first switching means. The inspection apparatus according to claim 1, wherein the fourth switch means comprises an NPN transistor TR73 having a base end connected to a data transmission end through a resistor R71, and a base end and a collector end connected to a resistor R72. And communication device between the electronic control unit. The method of claim 1, wherein the fifth switching means has a base end is connected to the fourth switching means through a resistor (R81), the emitter end is connected to the power supply terminal (V) and the emitter end and the base end is a resistor (R82) Communication device between the control device and the electronic control device, characterized in that consisting of a PNP transistor (TR83) connected to.