Vehicle chassis direct-current distribution box detection circuit, chassis direct-current distribution box thereof and vehicle

Abstract

The utility model discloses a vehicle chassis direct-current distribution box detection circuit, a chassis direct-current distribution box thereof and a vehicle. The vehicle chassis direct-current distribution box detection circuit comprises an acquisition control module; the diode detection module comprises an operational amplifier N2A and an optocoupler E2, the positive input end and the negative input end of the operational amplifier N2A are connected with divider resistors respectively, the output end of the operational amplifier N2A is connected with the input end of the optocoupler E2, and the output end of the optocoupler E2 is connected with the acquisition control module; the fuse detection module comprises a fuse F1, a resistor R8, a diode V3 and an optical coupler E1, the fuse F1 is connected with the resistor R8 and the diode V3, the resistor R8 is connected with the input end of the optical coupler E1, and the output end of the optical coupler E1 is connected with the acquisition control module. The working states of the input diode and the output fuse are detected, and the fuse with a specific fault is clearly positioned by observing the indicating lamp, so that the product reliability is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle chassis DC distribution box detection, in particular to a vehicle chassis DC distribution box detection circuit, its chassis DC distribution box and vehicle. Background Technique

[0002] The DC distribution box for special vehicle chassis (hereinafter referred to as the chassis DC distribution box) is mainly used for vehicle chassis power distribution output and overload protection.

[0003] The input of the chassis DC distribution box is provided with a DC contactor in parallel with a large current diode for reverse connection prevention design of the input, and the diode is a backup design. When the special vehicle is driving in an environment with a large vibration intensity, the DC contactor has the condition of contact dropout. At this time, the diode can be used for auxiliary power supply of the equipment to ensure uninterrupted power supply; when the DC contactor fails, the diode can supply power to the equipment for a short time to complete the tasks of the whole vehicle, but it needs to be replaced in time.

[0004] The output of the chassis DC distribution box uses power fuses for output overload and short circuit protection, and most of the power fuses are plug-in power fuses. When the output is overloaded or short-circuited, the fuse will melt to protect the output.

[0005] At present, the special vehicle chassis DC distribution box has no detection measures for the states of the input diode and the output fuse, which leads to the following disadvantages:

[0006] When the DC contactor fails and the diode is put into operation, the equipment cannot timely know whether the DC contactor is damaged and whether the diode has been working for a long time, and cannot replace the DC contactor in time.

[0007] When the fuse is damaged due to output overload or short circuit and needs to be replaced in time, it is impossible to directly judge whether the fuse is damaged, and it is necessary to take it out by hand to check to clarify the specific damaged fuse, which is not convenient for use or troubleshooting. Content of the Utility Model

[0008] In order to solve the above technical problems, the utility model provides a vehicle chassis DC distribution box detection circuit, including:

[0009] An acquisition control module;

[0010] A diode detection module, including an operational amplifier N2A and an optocoupler E2. Among them, the positive input terminal and the negative input terminal of the operational amplifier N2A are respectively connected with voltage dividing resistors, the output terminal of the operational amplifier N2A is connected with the input terminal of the optocoupler E2, and the output terminal of the optocoupler E2 is connected with the acquisition control module; and

[0011] The fuse detection module includes a fuse F1, a resistor R8, a diode V3, and an optocoupler E1. Among them, the fuse F1 is respectively connected to the resistor R8 and the diode V3, the resistor R8 is connected to the input end of the optocoupler E1, and the output end of the optocoupler E1 is connected to the acquisition control module.

[0012] Further, a voltage-dividing resistor R12 and R14 are connected to the positive input end of the operational amplifier N2A, and a voltage-dividing resistor R9 and R17 are connected to the negative input end of the operational amplifier N2A.

[0013] Further, a resistor R18 is connected between the output end of the operational amplifier N2A and the negative input end of the operational amplifier N2A.

[0014] Further, a resistor R16 and a capacitor C40 are also connected between the positive electrode of the light-emitting diode at the input end of the optocoupler E2 and the output end of the operational amplifier N2A, and one end of the capacitor C40 is grounded.

[0015] Further, the collector of the phototransistor at the output end of the optocoupler E2 is connected to the power supply and the acquisition control module; the emitter of the phototransistor at the output end of the optocoupler E2 is grounded.

[0016] Further, the fuse detection module further includes an indicator light H1. The negative electrode of the light-emitting diode at the input end of the optocoupler E1 is connected to the indicator light H1, the positive electrode of the light-emitting diode at the input end of the optocoupler E1 is connected to the resistor R8, and a capacitor C36 and a resistor R10 are connected in parallel between the positive and negative electrodes of the light-emitting diode at the input end of the optocoupler E1.

[0017] Further, the collector of the phototransistor at the output end of the optocoupler E1 is connected to the power supply and the acquisition control module; the emitter of the phototransistor at the output end of the optocoupler E1 is grounded.

[0018] A chassis DC distribution box has the vehicle chassis DC distribution box detection circuit described above.

[0019] A vehicle includes a chassis DC distribution box and an operation console. The chassis DC distribution box has the vehicle chassis DC distribution box detection circuit described above; the acquisition control module is communicatively connected to the operation console through a CAN bus communication circuit.

[0020] Preferably, the CAN bus communication circuit uses a transceiver chip with the model CTM1051AM.

[0021] Compared with the prior art, the present utility model has the following beneficial effects:

[0022] 1. The diode detection module is used to detect the working state of the input diode of the main circuit, which can prompt the operator to replace the DC contactor in time and improve the product reliability.

[0023] 2. The fuse detection module is used to detect the state of the output fuse. When the fuse is damaged and blown, the corresponding fuse status indicator light will be on. The acquisition and control module collects and reports the fuse status, and the specific faulty fuse can be clearly located by observing the indicator light, enabling the operator to understand the equipment status in time and improving the product reliability. Description of the Drawings

[0024] Figure 1 It is a schematic diagram of the DC power distribution box for vehicle chassis disclosed in the embodiment of the present invention;

[0025] Figure 2 It is a principle block diagram of the detection circuit of the DC power distribution box for vehicle chassis disclosed in the embodiment of the present invention;

[0026] Figure 3 It is a circuit diagram of the diode detection module disclosed in the embodiment of the present invention;

[0027] Figure 4 It is a circuit diagram of the fuse detection module disclosed in the embodiment of the present invention;

[0028] Figure 5 It is a power supply circuit diagram of the control board disclosed in the embodiment of the present invention;

[0029] Figure 6 It is a CAN bus communication circuit diagram disclosed in the embodiment of the present invention.

[0030] In the figure: 1. Acquisition and control module; 2. Diode detection module; 3. Fuse detection module. Detailed Embodiment

[0031] To make the technical solutions and technical effects of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments.

[0032] The present invention aims to provide a detection circuit for a DC power distribution box for vehicle chassis, which is applied in the DC power distribution box for vehicle chassis as shown in Figure 1 to detect the states of the input diode and the output fuse of the DC power distribution box for vehicle chassis, so as to enable the operator to understand the equipment failure in time and thus improve the product reliability.

[0033] Refer to Figure 2, the vehicle chassis DC distribution box detection circuit mainly includes an acquisition control module 1, a diode detection module 2, a fuse detection module 3, a CAN bus communication circuit, and a control board power supply circuit. Specifically:

[0034] Regarding the acquisition control module 1 and the CAN bus communication circuit: When the output fuse is blown and open-circuited, the status indicator light is on. After the acquisition control module 1 detects the open-circuit status of the output fuse, it communicates with the host computer through the CAN bus communication circuit and reports the fuse on / off detection signal of the output device. Generally, the diode detection module 2 and the fuse detection module 3 are both set in the acquisition control module 1. Figure 2 For the convenience of illustration, they are marked separately here. Among them, refer to Figure 6 , the CAN bus communication circuit uses a transceiver chip of model CTM1051AM. This circuit is a conventional setting in this field and will not be elaborated here.

[0035] Regarding the diode detection module 2: Refer to Figure 3 , the diode detection module 2 includes an operational amplifier N2A and an optocoupler E2. Among them, the positive input terminal of the operational amplifier N2A is connected with voltage-dividing resistors R12 and R14, and the negative input terminal of the operational amplifier N2A is connected with voltage-dividing resistors R9 and R17; a resistor R18 is connected between the output terminal of the operational amplifier N2A and the negative input terminal of the operational amplifier N2A. A resistor R16 and a capacitor C40 are also connected between the positive electrode of the light-emitting diode at the input terminal of the optocoupler E2 and the output terminal of the operational amplifier N2A, and one end of the capacitor C40 is grounded. The collector of the phototransistor at the output terminal of the optocoupler E2 is connected to the power supply and the acquisition control module 1; the emitter of the phototransistor at the output terminal of the optocoupler E2 is grounded. When the input DC contactor is normal, the voltages at both ends of POWERIN-1 and POWERIN-2 are the same, and the output voltage of the amplifier is 0V; when the DC contactor fails, the contact is disconnected, the diode is connected to work. Due to the 0.63V tube voltage drop of the diode, after voltage division and amplification, the output voltage is about 5.20V, which can drive the optocoupler E2 to conduct, and the detection signal SRPB-IO is set low. After the acquisition control module 1 acquires the low-level signal, it uploads it to the console through the CAN bus communication circuit to prompt the operator to replace the DC contactor in time.

[0036] Regarding the fuse detection module 3: Refer to Figure 4, the fuse detection module 3 includes a fuse F1, a resistor R8, a diode V3, an optocoupler E1, and an indicator light H1. Among them, the fuse F1 is respectively connected to the resistor R8 and the diode V3. The positive pole of the light-emitting diode at the input end of the optocoupler E1 is connected to the resistor R8. A capacitor C36 and a resistor R10 are connected in parallel between the positive and negative poles of the light-emitting diode at the input end of the optocoupler E1. The collector of the phototransistor at the output end of the optocoupler E1 is connected to the power supply and the acquisition control module 1; the emitter of the phototransistor at the output end of the optocoupler E1 is grounded. The output loop of the chassis DC distribution box is used for output power supply through the fuse. When the fuse F1 is normal, the voltage at the 2-foot of the resistor R8 is the same as the voltage at the 1-foot of the diode V3, making the optocoupler E1 non-conductive; when the fuse F1 fails and opens, there is no voltage at the 1-foot of the diode V3, the optocoupler E1 conducts, the IO1 signal is set low, and the indicator light H1 lights up. When the acquisition control module 1 detects a change in the IO1 level, it uploads it to the console through the CAN bus communication circuit, so that the operator can timely understand the equipment status. When specifically replacing the fuse, the specific faulty fuse F1 can be clearly located by observing the indicator light H1.

[0037] The present invention further includes a control board power supply circuit. Refer to Figure 5 , the control board power supply circuit adopts a regulated power supply module with a power of 30W, and the power supply voltage is stepped down at different levels through a step-down module for the use of various levels of control electricity on the control board.

[0038] The present invention also has a microprocessor and its peripheral circuits, including a real-time crystal oscillator circuit, a reset circuit, a debugging interface, a ferroelectric memory, etc. Through software configuration, the state detection requirements of the input diode and the output fuse are completed. These circuits are all conventional circuits in the art, so they will not be elaborated here.

[0039] It should be noted that the chassis DC distribution box with the above circuit and the vehicle thereof both belong to the protection scope of the present invention.

[0040] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. The detection circuit of the DC power distribution box for a vehicle chassis, characterized in that, Including: A collection control module (1); A diode detection module (2), including an operational amplifier N2A and an optocoupler E2. Among them, a voltage-dividing resistor is connected to the positive input terminal and the negative input terminal of the operational amplifier N2A respectively. The output terminal of the operational amplifier N2A is connected to the input terminal of the optocoupler E2, and the output terminal of the optocoupler E2 is connected to the collection control module (1); and A fuse detection module (3), including a fuse F1, a resistor R8, a diode V3 and an optocoupler E1. Among them, the fuse F1 is connected to the resistor R8 and the diode V3 respectively. The resistor R8 is connected to the input terminal of the optocoupler E1, and the output terminal of the optocoupler E1 is connected to the collection control module (1).

2. The vehicle chassis DC power distribution box detection circuit according to claim 1, characterized in that A voltage-dividing resistor R12 and R14 are connected to the positive input terminal of the operational amplifier N2A, and a voltage-dividing resistor R9 and R17 are connected to the negative input terminal of the operational amplifier N2A.

3. The vehicle chassis DC power distribution box detection circuit according to claim 1, wherein, A resistor R18 is connected between the output terminal of the operational amplifier N2A and the negative input terminal of the operational amplifier N2A.

4. The vehicle chassis DC power distribution box detection circuit according to claim 1, wherein A resistor R16 and a capacitor C40 are also connected between the positive electrode of the light-emitting diode at the input terminal of the optocoupler E2 and the output terminal of the operational amplifier N2A, and one end of the capacitor C40 is grounded.

5. The vehicle chassis DC power distribution box detection circuit according to claim 1 or 4, characterized in that, The collector of the phototransistor at the output terminal of the optocoupler E2 is connected to the power supply and the collection control module (1); the emitter of the phototransistor at the output terminal of the optocoupler E2 is grounded.

6. The vehicle chassis DC power distribution box detection circuit according to claim 1 or 4, characterized in that The fuse detection module (3) further includes an indicator light H1. The negative electrode of the light-emitting diode at the input terminal of the optocoupler E1 is connected to the indicator light H1. The positive electrode of the light-emitting diode at the input terminal of the optocoupler E1 is connected to the resistor R8. A capacitor C36 and a resistor R10 are connected in parallel between the positive and negative electrodes of the light-emitting diode at the input terminal of the optocoupler E1.

7. The vehicle chassis DC power distribution box detection circuit according to claim 6, characterized in that, The collector of the phototransistor at the output terminal of the optocoupler E1 is connected to the power supply and the collection control module (1); the emitter of the phototransistor at the output terminal of the optocoupler E1 is grounded.

8. A chassis DC distribution box, characterized in that, There is a vehicle chassis DC distribution box detection circuit as described in any one of claims 1-7.

9. A vehicle, comprising a chassis DC distribution box and a console, characterized in that, The chassis DC distribution box has a vehicle chassis DC distribution box detection circuit as described in any one of claims 1-7; the collection control module (1) is communicatively connected to the console through a CAN bus communication circuit.

10. The vehicle according to claim 9, characterized in that, The CAN bus communication circuit uses a transceiver chip with the model CTM1051AM.

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