Commercial vehicle empennage adjustable device

Abstract

The invention relates to the technical field of commercial vehicle control, in particular to a commercial vehicle empennage adjustable device, which is characterized in that a position calculation module is adopted for speed measurement during the running of a commercial vehicle, a collected speed signal is sent to a data processing circuit for digital processing and then is sent to a motor control circuit, and a control function is utilized for effective control; the motor control circuit compares the received digital speed signal with a built-in decision mode and drives an external empennage to perform a series of actions; the action signals are fed back to the data processing circuit, the data processing circuit sends the processed action signals to the data sending circuit, the function of sending current action instruction information to a mobile phone is executed, and integrated intelligent control for mastering the current empennage state in real time is achieved. And meanwhile, a reset circuit is arranged to ensure that an operator can freely change the control mode of the vehicle in the driving process, and the empennage behavior can be intervened in a manual mode to avoid risks in an emergency.

Description

Technical Field

[0001] The invention relates to the technical field of commercial vehicle control, and in particular to an adjustable tail wing device for a commercial vehicle. Background Art

[0002] In the adjustable rear wing system, the function of the control device is to change the current extension and retraction state of the rear wing in real time according to the current vehicle speed. Therefore, the rear wing can be extended at high speed to achieve the best effect of reducing pressure difference resistance, and the rear wing can be retracted at low speed to achieve the best effect of reducing friction resistance. In the existing adjustable rear wing systems, most are designed for racing cars, and there is no control system designed for commercial vehicle rear wings. Due to the different resistance caused by the structures of the two, the rear wing control system that can act on racing cars may not be successfully used on commercial vehicles, and there is a lack of manual control strategies for commercial vehicle rear wing control. Summary of the invention

[0003] The purpose of the present invention is to provide an adjustable tail wing device for a commercial vehicle, which can automatically adjust the state of the tail wing in real time according to the current speed of the commercial vehicle to achieve the purpose of reducing wind resistance. At the same time, it can also switch to a manual mode, in which the state of the tail wing can be freely controlled to achieve the purpose of protecting the tail wing in an emergency.

[0004] To achieve the above-mentioned object, the present invention provides an adjustable tail wing device for a commercial vehicle, comprising a position calculation module, a data acquisition circuit, a data processing circuit, a boost circuit, a data transmission circuit, a motor control circuit, a reset circuit and a power supply circuit;

[0005] The data processing circuit adopts a single-chip microcomputer module, and the data acquisition circuit sends the digital signal collected by the position calculation module to the data processing circuit; the boost circuit increases the voltage signal input by the power supply circuit from 3.3V to 5V and then transmits the signal to the single-chip microcomputer module, and is connected to the motor control circuit; the power supply circuit is directly connected to the single-chip microcomputer module to provide a working voltage for the single-chip microcomputer module; a switch module is set in the reset circuit and is directly connected to the single-chip microcomputer module; after processing the data, the single-chip microcomputer module transmits the current signal to the communication module through the data transmission circuit, and the communication module converts the signal into information and sends it out;

[0006] The position calculation module is connected to the external antenna, the motor control circuit includes a motor control module, and the motor drive module controls the extension and retraction of the external tail wing by controlling the motor.

[0007] Among them, the digital processing circuit uses the analog-to-digital converter in the MCU to measure the voltage, converts the current voltage value into a specific number, and then feeds the obtained number back to the system for judgment; it determines whether the current digital processing circuit outputs a voltage of 5V. If not, the 3.3V signal is input to the boost circuit to increase it to 5V.

[0008] The power supply circuit is responsible for converting the external input voltage 24V into the working voltage 5V; the reset circuit provides switching between manual and automatic tail wing control modes.

[0009] The boost circuit adopts an improved transistor voltage regulator module, specifically, two fixed-size resistors are introduced at the N-end and P-end of the basic transistor, and the output voltage of the transistor is stably increased from 3.3V to 5V according to the voltage division principle.

[0010] Wherein, the data processing circuit adopts stm32 single chip microcomputer to perform data processing.

[0011] Among them, the stm32 microcontroller uses cubemx for bottom-level driver configuration.

[0012] The data acquisition circuit obtains signals from GPS satellites through a position calculation module and an external antenna, and then calculates the current spatial position of the vehicle through triangulation.

[0013] Among them, in the automatic tail wing control mode, when the current vehicle speed is greater than 75KM / h or less than 20KM / h, the tail wing is automatically extended or retracted, and vehicle information is collected during the action and sent through the communication module.

[0014] The reset circuit includes an external controller, a shutdown button, a mode switching button, an extension button, and a retraction button; the external controller uses the mode switching button to switch between the automatic mode and the manual mode of the commercial vehicle, and uses the shutdown button to cut off the power circuit in an emergency;

[0015] When switching to manual mode, pressing the extension button directly extends the tail wing through the data processing circuit; pressing the retraction button directly retracts the tail wing through the data processing circuit.

[0016] The present invention provides an adjustable tail wing device for commercial vehicles. A position calculation module is used to measure the speed during the driving of the commercial vehicle. The collected speed signal is sent to the data processing circuit, which is then digitally processed and sent to the motor control circuit, and effectively controlled by the control function configured by cubemx. The motor control circuit compares the received digital speed signal with the internal decision-making mode, and drives the external tail wing to perform a series of actions. The action signal is fed back to the data processing circuit, and the data processing circuit sends the processed action signal to the data sending circuit, which executes the function of sending the current action instruction information to the mobile phone, and realizes the integrated intelligent control of the current tail wing state in real time. At the same time, a reset circuit is provided to ensure that the operator can freely change the control mode of the vehicle during driving, and can intervene in the tail wing behavior through manual mode to avoid risks when encountering emergencies. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 The invention is a principle structural block diagram of an adjustable rear wing device for a commercial vehicle.

[0019] Figure 2 It is a schematic diagram of the structure of the position calculation module of the present invention.

[0020] Figure 3 It is a schematic diagram of the structure of the motor control module of the present invention.

[0021] Figure 4 It is a schematic diagram of the structure of the switch module in the reset circuit of the present invention.

[0022] Figure 5 It is a schematic diagram of the structure of the single chip microcomputer module of the present invention.

[0023] Figure 6 It is a schematic diagram of the boost circuit structure of the present invention.

[0024] Figure 7 It is a schematic diagram of the communication module structure of the present invention.

[0025] Figure 8 It is a schematic diagram of the power supply circuit structure of the present invention.

[0026] Fig. 9 It is a structural block diagram of the reset circuit of the present invention. DETAILED DESCRIPTION

[0027] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0028] See also Figures 1 to 9 , the present invention provides an adjustable tail wing device for a commercial vehicle, comprising a position calculation module, a data acquisition circuit, a data processing circuit, a boost circuit, a data transmission circuit, a motor control circuit, a reset circuit and a power supply circuit;

[0029] The data processing circuit adopts a single-chip microcomputer module, and the data acquisition circuit sends the digital signal collected by the position calculation module to the data processing circuit; the boost circuit increases the voltage signal input by the power supply circuit from 3.3V to 5V and then transmits the signal to the single-chip microcomputer module, and is connected to the motor control circuit; the power supply circuit is directly connected to the single-chip microcomputer module to provide a working voltage for the single-chip microcomputer module; a switch module is set in the reset circuit and is directly connected to the single-chip microcomputer module; after processing the data, the single-chip microcomputer module transmits the current signal to the communication module through the data transmission circuit, and the communication module converts the signal into information and sends it out;

[0030] The position calculation module is connected to the external antenna, the motor control circuit includes a motor drive module, and the motor control module controls the extension and retraction of the external tail wing by controlling the motor.

[0031] The control principle structure diagram is as follows: Figure 1 Specifically, the position calculation module receives and demodulates the broadcast C / A signal, and calculates the current vehicle speed using the collected time, longitude and latitude position, solution status, number of satellites and other information. The data acquisition circuit sends the digital signal collected by the position calculation module to the data processing circuit, and issues different operation instructions to the motor drive module of the motor control circuit according to the speed, controls the motor to perform different actions on the external tail wing, and feeds back the current external tail wing action signal to the communication module through the single-chip microcomputer module. The communication module then converts the signal into information and sends it to the tester's mobile phone.

[0032] The following combined process is further explained:

[0033] The principle of judging the digital signal of the digital processing circuit is: using the analog-to-digital converter in the MCU to measure the voltage, and converting the current voltage value through the formula:

[0034] ADC value = (voltage to be measured / Vref) × (ADC maximum value)

[0035] Convert it into a specific number, and then feed the obtained number back to the system for judgment. For example, at 12-bit resolution, the ADC value represented by 3.3V is about 4095, while the ADC value represented by 5V voltage is about 2719. The judgment is made through the following steps:

[0036] Since the system of this patent operates at a 12-bit resolution, when judging the size of the ADC value, if the ADC value is 4095, the speed judgment function is turned off; if the ADC value is 2719, the speed judgment function is turned on to collect the current vehicle speed for the next step.

[0037] Determine whether the current digital processing circuit outputs a voltage of 5V. If not, input the 3.3V signal to the boost circuit of the voltage regulator module to increase it to 5V. Select a certain input port in turn to give different action instructions to the motor control circuit to control external devices. Feedback the current action instruction signal to the data processing circuit to send a selection signal suitable for the signal sending circuit. The communication module then sends the motor data to the mobile phone through the signal sending circuit to complete the data storage, display, and processing. The power supply circuit converts the external input voltage of 24V into the working voltage of 5V. The reset circuit provides manual reset and tail control mode switching.

[0038] Furthermore, the boost circuit adopts an improved transistor voltage regulator module, which has the following characteristics: two fixed-size resistors are introduced at the N-end and P-end of the basic transistor, and the voltage division principle is used to stably increase the transistor output voltage from 3.3V to 5V, and the size of the resistor has been actually verified by the circuit board to prove that the voltage output result is feasible.

[0039] The transistor voltage regulator module has the following functions: the high-level output of each pin of the data processing circuit is only 3.3V, which cannot drive the motor control circuit to operate normally. After the pin output level is boosted by the boost circuit, the data processing circuit can correctly control the action of the motor control circuit.

[0040] The data acquisition circuit uses a position calculation module, which uses an external antenna to collect information such as time, longitude and latitude, solution status, and number of satellites to calculate the current vehicle speed. The data processing circuit uses an STM32 microcontroller. In the automatic mode of the tail wing, the specific data processing process is as follows:

[0041] First, the external antenna of the position calculation module is used to obtain signals from GPS satellites, including the satellite's position and time information, and the obtained information is amplified, filtered, and modulated to extract valid GPS signals.

[0042] Secondly, the spatial position of the current vehicle is calculated by triangulation. The principle is: by calculating the distance from the GPS receiver to the three satellites, the position of the receiver is obtained by using the trilateral measurement equation. Let the position of the receiver be P(x, y, z), and the positions of the satellites be S 1 (x 1 ,y 1 ,z 1 ), S 2 (x 2 ,y 2 ,z 2 )), and S 3 (x 3 ,y 3 ,z 3 ). The distances between the receiver and these satellites are d1 , d 2 and d 3 . Then we have the following system of equations:

[0043] (xx 1 ) 2 +(yy 1 ) 2 +(zz 1 ) 2 =d 1 2

[0044] (xx 2 ) 2 +(yy 2 ) 2 +(zz 2 ) 2 =d 2 2

[0045] (xx 3 ) 2 +(yy 3 ) 2 +(zz 3 ) 2 =d 3 2

[0046] Solve the simultaneous equations to calculate the position of P(x, y, z).

[0047] Next, the location calculation module continuously obtains the changes in the current vehicle's geographic location (longitude and latitude), and calculates the current vehicle speed based on the distance and time difference between the two location points. The current vehicle speed is fed back to the STM32 microcontroller, and the speed judgment cycle time is set every 60 seconds. The tail wing is controlled in different actions according to the current vehicle speed, including:

[0048] 1. When the current vehicle speed is greater than 75KM / h, the code control principle is as follows:

[0049] Step 1: Confirm that the current system has entered the speed judgment function

[0050] Step 2: Collect and judge the current vehicle speed every 60 seconds.

[0051] Step 3: If the vehicle speed is greater than or equal to 75km / h, stop speed judgment, enter the tail wing extension function, and control the car's tail wing to extend.

[0052] Step 4: If the vehicle speed is less than or equal to 20 km / h, stop speed judgment, record the tail wing retraction function, and control the car's tail wing to retract.

[0053] 2. And introduce the state function when the current action is in progress

[0054] Tail:opened: Tail extension function.

[0055] Tail:closed: Tail retraction function.

[0056] Message: message sending function.

[0057] Gpsdata date: The location calculation module calculates the distance function.

[0058] Gpsdatatime: Position calculation module calculation time function.

[0059] Gpsdata speed: Position calculation module calculates speed function.

[0060] The current vehicle information, including the tail status, current time, current vehicle speed, etc., is sent to the tester's mobile phone to help the tester determine whether the control function is operating normally. Finally, an optimized tail control system integrating position calculation and communication modules is achieved.

[0061] In the manual mode of the control system, if Fig. 9 As shown, the reset circuit includes an external controller, a close button, a mode switching button, an extension button, and a retraction button. The operator operates the data processing circuit through the external controller. The external controller can use the mode switching button to switch the automatic mode and manual mode of the commercial vehicle, and use the close button to cut off the power circuit in an emergency. When switching to the automatic mode, the controller will automatically operate as described above. When switching to the manual mode, pressing the extension button of the controller can control the tail wing to directly extend through the data processing circuit; when pressing the retraction button, the tail wing can be directly retracted through the data processing circuit to achieve the purpose of manual reset.

[0062] In summary, compared with the prior art, the advantages of the present invention are:

[0063] 1. Using the position calculation module to collect the current vehicle speed data can obtain the current operating status of the commercial vehicle faster and more accurately, so that subsequent operations can be performed more accurately.

[0064] 2. The self-designed boost module is used to successfully make the motor control module compatible with the stm32 microcontroller.

[0065] 3. After actual vehicle verification, when the car is in automatic mode, the stm32 microcontroller can automatically control the retraction and extension of the external tail wing with high precision based on the speed data collected by the position calculation module, fully realizing the fully automated operation of the tail wing of the commercial vehicle during driving.

[0066] 4. The communication module can send the current tail wing status information to the driver's mobile phone in real time, providing timely feedback on the current tail wing operation status.

[0067] 5. For special situations such as highway entrances, underground parking lots, and parallel driving on highways, the controller can be switched back to manual mode to retract the tail wing based on the reminder of the tail wing status information on the current mobile phone, thereby reducing the risk of vehicle operation and eliminating driving hazards in this area.

[0068] 6. The material cost of the present invention is low, the control effect is good, and under the dual control of the position calculation module and the communication module, the accuracy and safety of the control are effectively improved.

[0069] What is disclosed above is only a preferred embodiment of the present invention, and it certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made according to the claims of the present invention still fall within the scope of the invention.

Claims

1. A commercial vehicle rear wing adjustable device, characterized in that: It includes a position calculation module, a data acquisition circuit, a data processing circuit, a boost circuit, a data transmission circuit, a motor control circuit, a reset circuit and a power supply circuit; The data processing circuit adopts a single-chip microcomputer module, and the data acquisition circuit sends the digital signal collected by the position calculation module to the data processing circuit; the boost circuit increases the voltage signal input by the power supply circuit from 3.3V to 5V and then transmits the signal to the single-chip microcomputer module, and is connected to the motor control circuit; the power supply circuit is directly connected to the single-chip microcomputer module to provide working voltage for the single-chip microcomputer module; a switch module is set in the reset circuit and is directly connected to the single-chip microcomputer module; after processing the data, the single-chip microcomputer module transmits the current signal to the communication module through the data transmission circuit, and the communication module converts the signal into information and sends it to the operator; The position calculation module is connected to the external antenna, and the motor control circuit includes a motor control module. The motor control module controls the extension and retraction of the external tail wing by controlling the motor.

2. The commercial vehicle rear wing adjustable device according to claim 1, characterized in that: The digital processing circuit uses the analog-to-digital converter in the MCU to measure the voltage, converts the current voltage value into a specific number, and then feeds the obtained number back to the system for judgment; it determines whether the current digital processing circuit outputs a voltage of 5V. If not, the 3.3V signal is input to the boost circuit to increase it to 5V.

3. The commercial vehicle rear wing adjustable device according to claim 2, characterized in that: The power supply circuit is responsible for converting the external input voltage of 24V into the working voltage of 5V; the reset circuit provides switching between manual and automatic control modes of the tail wing.

4. The commercial vehicle rear wing adjustable device according to claim 3, characterized in that: The boost circuit adopts an improved transistor voltage regulator module, specifically, two fixed-size resistors are introduced at the N-end and P-end of the basic transistor, so that the transistor output voltage is stably increased from 3.3V to 5V according to the voltage division principle.

5. The commercial vehicle rear wing adjustable device according to claim 4, characterized in that: The data processing circuit uses an stm32 single-chip microcomputer for data processing and uses cubemx for underlying driver configuration.

6. The commercial vehicle rear wing adjustable device according to claim 5, characterized in that: The data acquisition circuit obtains signals from GPS satellites through the position calculation module and the external antenna connected thereto, and then calculates the current spatial position of the vehicle through triangulation.

7. The commercial vehicle rear wing adjustable device according to claim 6, characterized in that: In the automatic tail wing control mode, when the current vehicle speed is greater than 75KM / h or less than 20KM / h, the tail wing will be automatically extended or retracted. At the same time, vehicle information will be collected and sent through the communication module.

8. The commercial vehicle rear wing adjustable device according to claim 7, characterized in that: The reset circuit includes an external controller, a shutdown button, a mode switching button, an extension button, and a retraction button; the external controller uses the mode switching button to switch between the automatic mode and the manual mode of the commercial vehicle, and uses the shutdown button to cut off the power circuit in an emergency; When switching to manual mode, pressing the extension button directly extends the tail wing through the data processing circuit; pressing the retraction button directly retracts the tail wing through the data processing circuit.

Images