Active IO board suitable for train obstacle detection system

Abstract

The utility model relates to an active IO board suitable for a train obstacle detection system. The active IO board comprises a single-chip microcomputer, an input acquisition circuit, a watchdog circuit, a brake output circuit and a CAN bus circuit. The watchdog circuit is connected with the single-chip microcomputer and used for resetting the single-chip microcomputer when it is detected that internal programs of the single-chip microcomputer run abnormally. The input acquisition circuit is connected with the single-chip microcomputer and is used for sending a detected switching value acquisition signal to the single-chip microcomputer. The single-chip microcomputer is connected with the brake output circuit and used for controlling the brake output circuit to output a brake signal to trigger a train brake. The CAN bus circuit is connected with the single-chip microcomputer and used for converting message information output by the single-chip microcomputer into obstacle alarm information and sending the obstacle alarm information to a vehicle-mounted host.

Description

TECHNICAL FIELD

[0001] The utility model belongs to rail transit obstacle detection field relates to a kind of active IO board suitable for train obstacle detection system. BACKGROUND

[0002] The conventional train obstacle detection system only has single obstacle communication prompt function, without automatic brake control of train emergency avoidance obstacle, i.e. after train detects obstacle, only obstacle alarm can be carried out, and train braking still needs artificial operation, which has certain security risk loophole for train running safety requirement.

[0003] In order to enable train to automatically take brake measure without human control before detecting obstacle, and further avoid collision risk between train and obstacle in time, the utility model is proposed. SUMMARY

[0004] Therefore, in view of the deficiencies in the prior art, the utility model aims to provide an active IO board suitable for train obstacle detection system.

[0005] In order to achieve the above purpose, the solution of the utility model is as follows:

[0006] An active IO board suitable for train obstacle detection system comprises a single-chip microcomputer, an input acquisition circuit, a watchdog circuit, a brake output circuit and a CAN bus circuit; the watchdog circuit is connected with the single-chip microcomputer and used for resetting the single-chip microcomputer when detecting abnormal program running in the single-chip microcomputer; the input acquisition circuit is connected with the single-chip microcomputer and used for sending detected on-off value acquisition signal to the single-chip microcomputer; the single-chip microcomputer is connected with the brake output circuit and used for controlling the brake output circuit to output brake signal to trigger train brake; and the CAN bus circuit is connected with the single-chip microcomputer and used for converting message information output by the single-chip microcomputer into obstacle alarm information and sending the information to vehicle-mounted host computer.

[0007] In one embodiment, the 7th pin of the single-chip microcomputer U4 is connected with the 4th pin of U2, the 42nd pin of U4 is connected with R45, the 14th pin of U4 is connected with the 4th pin of photo-coupler U9, the 61st pin of U4 is connected with the 4th pin of U7, and the 62nd pin of U4 is connected with the 1st pin of U7.

[0008] In one of the embodiments, one end of the resistance R17 in the input acquisition circuit is connected to 3.3V, the other end of R17 is connected to pin 4 of optocoupler U9, pin 3 of U9 is connected to GND, pin 1 of U9 is connected to the cathode of diode D3, pin 2 of U9 is connected to the anode of D3, the anode of D3 is connected to DC 110V-, one end of resistance R18 is connected to the cathode of D3, the other end of R18 is connected to the switch quantity acquisition signal, one end of resistance R19 is connected to DC 110V-, the other end of R19 is connected to the switch quantity acquisition signal.

[0009] In one of the embodiments, pin 2 of reset chip U3 in the watchdog circuit is connected to GND, pin 4 of U3 is connected to pin 26 of U4, pin 5 of U3 is connected to 3.3V, one end of resistance R3 and capacitor C2 is connected to pin 5 of U3, the other end of R3 is connected to pin 3 of U3, the other end of C2 is connected to pin 2 of U3, pin 4 of analog switch U2 is connected to pin 7 of U4, one end of resistance R1 is connected to pin 4 of U2, the other end of R1 is connected to 3.3V, pin 2 of U2 is connected to 3.3V, pin 5 of U2 is connected to pin 1 of U3, pin 3 of U2 is connected to GND.

[0010] In one of the embodiments, pins 4 and 5 of relay U20 in the brake output circuit are connected to the train brake, pin 1 of U20 and the cathode of diode D13 are connected to 13V, pin 2 of U20 and the anode of D13 are connected to the collector of triode Q1, the base of Q1 and resistance R47 are connected to resistance R45, the other end of R45 is connected to pin 42 of U4, the other end of R47 and the emitter of Q1 are connected to ground.

[0011] In one of the embodiments, pin 4 of CAN chip U7 in the CAN bus circuit is connected to pin 61 of U4, pin 1 of U7 is connected to pin 62 of U4, pins 8 and 2 of U7 are connected to GND, pin 3 of U7 is connected to 5V, one end of capacitor C16 is connected to pin 3 of U7, the other end of C16 is connected to GND, pin 7 of U7 is connected to pin 1 of common mode filter L1, pin 6 of U7 is connected to pin 2 of L1, one end of capacitor C14 is connected to pin 7 of U7, the other end of C14 is connected to GND, one end of capacitor C15 is connected to pin 6 of U7, the other end of C15 is connected to GND, the cathode of diode D1 is connected to pin 4 of L1, the anode of D1 is connected to GND, the cathode of diode D2 is connected to pin 3 of L1, the anode of D2 is connected to GND, pins 4 and 3 of L1 are connected to the vehicle host.

[0012] In summary, when the train sensor detects an obstacle, the input acquisition circuit sends the detected DC 110V high voltage switching value acquisition signal to the single-chip microcomputer, and then the single-chip microcomputer sends message information and brake control signals to the CAN bus circuit and the brake output circuit respectively, the CAN bus circuit sends the message information sent by the single-chip microcomputer to the vehicle-mounted host computer in the form of obstacle alarm information, and the brake output circuit controls the train brake to make a brake action to avoid the obstacle in front of the train after receiving the brake control signal of the single-chip microcomputer. In order to prevent program failure of the single-chip microcomputer during long-time operation of the internal program, the watchdog circuit can send a reset control signal to the single-chip microcomputer to reset the single-chip microcomputer.

[0013] The active IO board suitable for the train obstacle detection system has the advantages that:

[0014] (1) The CAN bus circuit has the advantages of high transmission rate, high reliability and low cost.

[0015] (2) The watchdog circuit has the advantage of error detection reset of the CPU output signal. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The active IO board suitable for the train obstacle detection system has the advantages that:

[0017] Figure 2 The active IO board suitable for the train obstacle detection system has the advantages that:

[0018] Figure 3 The active IO board suitable for the train obstacle detection system has the advantages that:

[0019] Figure 4 The active IO board suitable for the train obstacle detection system has the advantages that:

[0020] Figure 5 The active IO board suitable for the train obstacle detection system has the advantages that:

[0021] Figure 6 The active IO board suitable for the train obstacle detection system has the advantages that: DETAILED DESCRIPTION

[0022] With reference to the drawings and the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative efforts are within the scope of the present application.

[0023] Please see the attached Figure 1 An active IO board suitable for a train obstacle detection system, comprising: a single-chip microcomputer 10, an input collection circuit 20, a watchdog circuit 30, a brake output circuit 40, a CAN bus circuit 50.

[0024] Please see the attached Figure 2 For example, in one of the embodiments, the 7th pin of the single-chip microcomputer U4 is connected to the 4th pin of U2, the 42nd pin of U4 is connected to R45, the 14th pin of U4 is connected to the 4th pin of U9, the 61st pin of U4 is connected to the 4th pin of U7, and the 62nd pin of U4 is connected to the 1st pin of U7.

[0025] Please see the attached Figure 3 For example, in one of the embodiments, one end of the resistor R17 in the input collection circuit is connected to 3.3V, the other end of R17 is connected to the 4th pin of the optocoupler U9, the 3rd pin of U9 is connected to GND, the 1st pin of U9 is connected to the cathode of the diode D3, the 2nd pin of U9 is connected to the anode of D3, the anode of D3 is connected to DC 110V-, one end of the resistor R18 is connected to the cathode of D3, the other end of R18 is connected to the on-off signal, one end of the resistor R19 is connected to DC 110V-, and the other end of R19 is connected to the on-off signal.

[0026] Please see the attached Figure 4 For example, in one of the embodiments, the 2nd pin of the reset chip U3 in the watchdog circuit is connected to GND, the 4th pin of U3 is connected to the 26th pin of U4, the 5th pin of U3 is connected to 3.3V, one end of the resistor R3 and the capacitor C2 is connected to the 5th pin of U3, the other end of R3 is connected to the 3rd pin of U3, the other end of C2 is connected to the 2nd pin of U3, the 4th pin of the analog switch U2 is connected to the 7th pin of U4, one end of the resistor R1 is connected to the 4th pin of U2, the other end of R1 is connected to 3.3V, the 2nd pin of U2 is connected to 3.3V, the 5th pin of U2 is connected to the 1st pin of U3, and the 3rd pin of U2 is connected to GND.

[0027] Please see the attached Figure 5For example, in one embodiment, the 4th pin and the 5th pin of the relay U20 in the brake output circuit are connected to the train brake, the 1st pin of U20 and the cathode of the diode D13 are connected to 13V, the 2nd pin of U20 and the anode of D13 are connected to the collector of the triode Q1, the base of Q1 and the resistor R47 are connected to the resistor R45, the other end of R45 is connected to the 42nd pin of U4, the other end of R47 and the emitter of Q1 are grounded.

[0028] Please see the attached Figure 6 For example, in one embodiment, the 4th pin of the CAN chip U7 in the CAN bus circuit is connected to the 61st pin of U4, the 1st pin of U7 is connected to the 62nd pin of U4, the 8th pin and the 2nd pin of U7 are connected to GND, the 3rd pin of U7 is connected to 5V, one end of the capacitor C16 is connected to the 3rd pin of U7, the other end of C16 is connected to GND, the 7th pin of U7 is connected to the 1st pin of the common mode filter L1, the 6th pin of U7 is connected to the 2nd pin of L1, one end of the capacitor C14 is connected to the 7th pin of U7, the other end of C14 is connected to GND, one end of the capacitor C15 is connected to the 6th pin of U7, the other end of C15 is connected to GND, the cathode of the diode D1 is connected to the 4th pin of L1, the anode of D1 is connected to GND, the cathode of the diode D2 is connected to the 3rd pin of L1, the anode of D2 is connected to GND, the 4th pin and the 3rd pin of L1 are connected to the vehicle host.

[0029] The above description is only a preferred example of the present application and is not limited to the present application. Although the present application has been described in detail with reference to the foregoing examples, those skilled in the art can modify the technical solutions described in the foregoing embodiments or replace some of the technical features with equivalent ones. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An active IO board suitable for use in a train obstacle detection system, characterized in that, It comprises: a single-chip microcomputer, an input acquisition circuit, a watchdog circuit, a brake output circuit and a CAN bus circuit; the watchdog circuit is connected with the single-chip microcomputer and is used for resetting the single-chip microcomputer when detecting that the internal program of the single-chip microcomputer is abnormal; the input acquisition circuit is connected with the single-chip microcomputer and is used for sending the detected switch acquisition signal to the single-chip microcomputer; the single-chip microcomputer is connected with the brake output circuit and is used for controlling the brake output circuit to output a brake signal to trigger the train brake; and the CAN bus circuit is connected with the single-chip microcomputer and is used for converting the message information output by the single-chip microcomputer into obstacle alarm information and sending the information to the vehicle-mounted host computer.

2. The active IO board for a train obstacle detection system of claim 1, wherein, The 14th pin of the single-chip microcomputer U4 is connected with the 4th pin of the optical coupler U9, the 61st pin of U4 is connected with the 4th pin of the CAN chip U7, the 62nd pin of U4 is connected with the 1st pin of U7, the 4th pin of the analog switch U2 is connected with the 7th pin of U4, the 4th pin of the reset chip U3 is connected with the 26th pin of U4, and the 42nd pin of U4 is connected with the resistor R45.

3. The active IO board for a train obstacle detection system of claim 1, wherein, In the input acquisition circuit, one end of the resistor R18 is connected with the 1st pin of the optical coupler U9, the other end of R18 is connected with the switch acquisition signal, one end of the resistor R19 is connected with the 2nd pin of the optical coupler U9, and the other end of R19 is connected with the switch acquisition signal.

4. The active IO board for a train obstacle detection system of claim 1, wherein, In the brake output circuit, the 4th and 5th pins of the relay U20 are connected with the train brake.

5. The active IO board for use in a train obstacle detection system of claim 1, wherein, In the CAN bus circuit, the 3rd and 4th pins of the common-mode filter L1 are connected with the vehicle-mounted host computer.

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