Special vehicle springboard type tail gate hovering control device based on CAN bus

Abstract

The utility model discloses a special vehicle springboard type tail gate hovering control device based on a CAN bus, which comprises a single-chip microcomputer, a driving and fault self-checking module and a hydraulic device, the hydraulic device comprises a main oil cylinder and a pump station, the main oil cylinder and the pump station are both installed on a vehicle body, a piston rod of the main oil cylinder is installed on a tail gate, a displacement sensor is arranged on the piston rod, and the displacement sensor is connected with the single-chip microcomputer. The displacement sensor is connected with the AD sampling module; a pressure switch is arranged in the pump station, the pressure switch is connected with the pressure switch signal acquisition module, the single chip microcomputer is respectively connected with the pressure switch signal acquisition module, the AD sampling module and the driving and fault self-checking module, and the driving and fault self-checking module is connected with a contactor used for controlling the pump station to work. According to the utility model, the tail gate can be freely suspended at all angles through the tail gate control key or by operating the driver display control terminal, and meanwhile, the angle of the tail gate can be observed in real time in a cab, so that the convenience for loading and unloading cargoes and people to enter and exit is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of based on CAN bus's special vehicle jump plate type tailgate hover control device. BACKGROUND

[0002] In the existing special vehicle tailgate control technology, the tailgate action is generally controlled by the key on the tailgate control device, which can only completely open or close the tailgate, cannot realize the tailgate hovering at any angle, and cannot observe the tailgate angle in real time in the cab when the tailgate is moving, reducing the comfort and convenience of the passenger operation, as well as the convenience of loading and unloading goods and passengers. SUMMARY

[0003] To solve the above technical problems, the utility model provides a kind of based on CAN bus's special vehicle jump plate type tailgate hover control device with simple structure and reliable work.

[0004] The technical solution of the utility model to solve the above technical problems is: a kind of based on CAN bus's special vehicle jump plate type tailgate hover control device, including power module, single-chip microcomputer, pressure switch signal acquisition module, AD sampling module, drive and fault self-checking module, hydraulic device, power module is the power supply of entire device, the hydraulic device includes main cylinder and the pump station for providing power for main cylinder, main cylinder and pump station are all installed on the vehicle body, the piston rod of main cylinder is installed on the tailgate, for controlling the opening and closing of tailgate, displacement sensor is provided on the piston rod, and the displacement sensor is connected with the AD sampling module;Pressure switch is provided in pump station, and the pressure switch is connected with the pressure switch signal acquisition module, the single-chip microcomputer is connected with the pressure switch signal acquisition module, AD sampling module, drive and fault self-checking module respectively, and the drive and fault self-checking module is connected with contactor for controlling the work of pump station.

[0005] The above based on CAN bus's special vehicle jump plate type tailgate hover control device, the drive and fault self-checking module includes high-side switch, first optocoupler, second optocoupler and third optocoupler, the input end of first optocoupler is connected with single-chip microcomputer, the output end of first optocoupler is connected with the input pin of high-side switch, the input end of second optocoupler is connected with the fault feedback pin of high-side switch, the input end of third optocoupler is connected with the output voltage pin of high-side switch and contactor, and the output end of second optocoupler and third optocoupler is connected with single-chip microcomputer.

[0006] The above based on CAN bus's special vehicle jump plate type tailgate hover control device further includes LED indication module, and the LED indication module is connected with single-chip microcomputer, for intuitively displaying the current position state of tailgate.

[0007] The aforementioned special vehicle ramp-type tailgate hovering control device based on CAN bus also includes a CAN communication module. The CAN communication module is connected to a microcontroller. The CAN communication module receives commands sent by the driver's display terminal and sends them to the microcontroller, as well as transmits tailgate status information to the driver's display terminal.

[0008] The aforementioned special vehicle ramp-type tailgate hovering control device based on CAN bus also includes a button detection module. The input end of the button detection module is connected to the tailgate control button, and the output end of the button detection module is connected to the microcontroller. It is used to detect the status of the tailgate control button and send the status information to the microcontroller.

[0009] The aforementioned CAN bus-based special vehicle ramp-type tailgate hovering control device also includes an alarm, which is connected to a microcontroller and is used to provide an audible and visual alarm when the tailgate is opened.

[0010] The beneficial effects of this utility model are as follows:

[0011] 1. This utility model enables the tailgate to be suspended at any angle through the tailgate control button or the driver's display terminal. At the same time, the tailgate angle can be observed in real time from the cab, improving the convenience of loading and unloading goods and allowing personnel to enter and exit. When the tailgate moves, the alarm will be activated by sound and light to remind people to stay away from the area around the tailgate and avoid safety accidents.

[0012] 2. This utility model uses an AD sampling module, a CAN communication module, and an LED indicator module to transmit the tailgate position and angle information to the driver's display terminal in real time, as well as display the tailgate's position status. This improves the convenience of use for vehicle occupants, saves labor costs, and enhances driving safety.

[0013] 3. This utility model can identify abnormal situations where the tailgate is stuck by foreign objects through the AD sampling module and the pressure switch signal acquisition module, so that the microcontroller can disconnect the hydraulic device drive output in time and the tailgate stops moving to avoid causing more serious damage to the vehicle.

[0014] 4. This utility model uses a drive and fault self-diagnosis module to drive the hydraulic device and diagnose short circuits in external loads to ensure vehicle safety. Attached Figure Description

[0015] Figure 1 This is a structural block diagram of the present invention.

[0016] Figure 2 This is the circuit diagram of the power supply module of this utility model.

[0017] Figure 3 This is the circuit diagram of the minimum system of the microcontroller of this utility model.

[0018] Figure 4 The circuit diagram of the CAN communication module of the utility model.

[0019] Figure 5 The circuit diagram of the pressure switch signal acquisition module of the utility model.

[0020] Figure 6 The circuit diagram of the drive and fault self-checking module of the utility model.

[0021] Figure 7 The circuit diagram of the key detection module of the utility model.

[0022] Figure 8 The circuit diagram of the AD sampling module of the utility model. DETAILED DESCRIPTION

[0023] The utility model will be further explained in connection with the drawings and embodiments.

[0024] As Figure 1 shown, a kind of based on CAN bus's special vehicle jump plate type tailgate hover control device, including power module, single-chip microcomputer, pressure switch signal acquisition module, AD sampling module, drive and fault self-checking module, hydraulic device, LED indicating module, CAN communication module, key detection module, alarm, power module is the power supply of entire device, the hydraulic device includes main cylinder and the pump station for providing power to main cylinder, main cylinder and pump station are all installed on vehicle body, the piston rod of main cylinder is installed on tailgate, for the opening and closing of tailgate, displacement sensor is equipped on piston rod, displacement sensor is used to monitor the displacement signal of piston rod, the extension length of piston rod can be obtained by displacement signal, to convert into the opening angle of tailgate;Displacement sensor is connected with AD sampling module, and the displacement signal collected by AD sampling module is sent into single-chip microcomputer;Pump station is equipped with pressure switch, and pressure switch is connected with pressure switch signal acquisition module, and pressure switch is used to monitor the pressure in pump station, the pressure in pump station is constantly changing in the process that the piston rod of main cylinder extends or retracts, when piston rod is completely retracted to initial state, pressure switch just exports signal and is sent into single-chip microcomputer by pressure switch signal acquisition module, to show that the piston rod of main cylinder has been completely retracted;The single-chip microcomputer is connected with pressure switch signal acquisition module, AD sampling module, drive and fault self-checking module respectively, and drive and fault self-checking module is connected with contactor for controlling the work of pump station.

[0025] The LED indicating module is connected with single-chip microcomputer, for intuitive display current position state of tailgate.

[0026] The CAN communication module is connected with single-chip microcomputer, and CAN communication module receives the command sent by driver display control terminal and is sent into single-chip microcomputer, and tailgate state information is transmitted to driver display control terminal.

[0027] The input terminal of the button detection module is connected to the tailgate control button, and the output terminal of the button detection module is connected to the microcontroller. It is used to detect the status of the tailgate control button and send the status information to the microcontroller.

[0028] The alarm is connected to a microcontroller and is used to trigger an audible and visual alarm when the tailgate is opened.

[0029] like Figure 2 As shown, the power supply module includes a 24V to 24V isolated power supply module to power the displacement sensor; a 24V to 5V isolated power supply module to drive the high-side switch; and a 24V to 3.3V power supply module to power the microcontroller. The use of the above isolated power supply modules improves the stability and reliability of the system.

[0030] like Figure 3 As shown, the microcontroller is a BC32F407ART, which is responsible for collecting displacement sensor data, pressure switch information, driving contactors, LED indicator modules and alarms, as well as collecting and processing data from the CAN communication module.

[0031] like Figure 4 As shown, the drive and fault self-test module includes a high-side switch ESW1, a first optocoupler, a second optocoupler, and a third optocoupler. The input terminal of the first optocoupler is connected to the PB pin of the microcontroller, and the output terminal of the first optocoupler is connected to the input pin of the high-side switch. The input terminal of the second optocoupler is connected to the fault feedback pin of the high-side switch, and the input terminal of the third optocoupler is connected to the output voltage pin of the high-side switch and the contactor. Figure 4 The output terminals of the second and third optocouplers (OUT-01) are both connected to the microcontroller.

[0032] like Figure 5 As shown, the CAN communication module uses a CAN bus transceiver. The two pins of the microcontroller are connected to the RXD and TXD pins of the CAN bus transceiver, respectively. A 120-ohm resistor is connected in CANH and CANL to match the bus impedance. A TVS diode is connected to one end of CANH and CANL to prevent electrostatic damage to the internal electronic components.

[0033] like Figure 6 As shown, the pressure switch signal acquisition module includes an optocoupler and a resistor. The pressure switch is connected to the SUOPRESS+ input terminal of the optocoupler, and the output terminal is connected to the PA5 pin of the microcontroller. When the pressure switch is closed, the circuit at the output terminal of the optocoupler is turned on. The microcontroller pin detects the level change, thereby realizing the pressure switch signal acquisition function and improving the anti-interference capability of the circuit.

[0034] like Figure 7As shown, the key detection module is mainly composed of a resistance, one end of which is connected to the single-chip microcomputer pin and the key input pin, and the other end of which is connected to the power supply; the single-chip microcomputer sets the input pin in the pull-up input mode to realize the key detection function; the PC8 pin of the single-chip microcomputer corresponds to the warning elimination key; the PB15 pin of the single-chip microcomputer corresponds to the open tail door key; the PC6 pin of the single-chip microcomputer corresponds to the close tail door key; the PC7 pin of the single-chip microcomputer corresponds to the open tail door to horizontal key; meanwhile, the single-chip microcomputer sets the key anti-shake function to improve the reliability and stability of the key operation.

[0035] As shown in Figure 8 The AD sampling module adopts two resistors in series, the PA3 pin of the single-chip microcomputer is connected between the two resistors, one end of the resistor is connected to the displacement sensor input signal, and the other end is connected to the ground.

[0036] The single-chip microcomputer of the utility model combines the CAN module, the AD sampling module, the driving and fault self-checking module, realizes the tail door control key or the driver display control terminal control tail door full angle arbitrary hovering, and is used for loading and unloading goods and personnel access.

Claims

1. A special vehicle ramp-type tailgate hovering control device based on CAN bus, characterized in that: The utility model relates to a tailgate control device, including power module, singlechip, pressure switch signal acquisition module, AD sampling module, drive and fault self-checking module, hydraulic device, power module is the whole device power supply, the hydraulic device includes main oil cylinder and is used for providing power for main oil cylinder pump station, and main oil cylinder and pump station are all installed on the vehicle body, and the piston rod of main oil cylinder is installed on the tail door and is used for controlling the opening and closing of tail door, and displacement sensor is equipped on the piston rod, and displacement sensor is connected with AD sampling module, and pressure switch is equipped in the pump station, and pressure switch is connected with pressure switch signal acquisition module, and the singlechip is connected with pressure switch signal acquisition module, AD sampling module, drive and fault self-checking module respectively, and drive and fault self-checking module are connected with contactor for controlling the work of pump station.

2. The CAN bus based hover control of a tailgate of a specialty vehicle according to claim 1, wherein: The drive and fault self-checking module includes high side switch, first optocoupler, second optocoupler and third optocoupler, the input end of first optocoupler is connected with singlechip, the output end of first optocoupler is connected with the input pin of high side switch, the input end of second optocoupler is connected with the fault feedback pin of high side switch, the input end of third optocoupler is connected with the output voltage pin of high side switch and contactor, and the output end of second optocoupler and third optocoupler is connected with singlechip.

3. The CAN bus based hover control of a tailgate of a specialty vehicle according to claim 1, wherein: It also includes LED indication module, the LED indication module is connected with singlechip, is used for the intuitive display tail door current position state.

4. The CAN bus based hover control of a tailgate of a specialty vehicle according to claim 1, wherein: It also includes CAN communication module, the CAN communication module is connected with singlechip, and CAN communication module receives the command sent by driver display control terminal and sends into singlechip and passes tail door state information to driver display control terminal.

5. The CAN bus based hover control of a tailgate of a specialty vehicle according to claim 1, wherein: It also includes key detection module, the input end of key detection module is connected with tail door control key, and the output end of key detection module is connected with singlechip, is used for detecting tail door control key state, and sends state information into singlechip.

6. The CAN bus based hover control of a tailgate of a specialty vehicle according to claim 1, wherein: It also includes alarm, and the alarm is connected with singlechip, is used for sound and light alarm when tail door opens.

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