Vehicle steering signal automatic identification control circuit

Abstract

The utility model discloses an automatic identification control circuit for a vehicle steering signal. The automatic identification control circuit comprises an input interface circuit, a master control and sensor circuit and a first switch control unit, the input interface circuit is connected with an external steering switch, and the output end of the input interface circuit is connected with the first switch control unit, so that a steering signal instruction is obtained through the steering switch, and a steering lamp of the first switch control unit is controlled to be turned on or turned off; the main control and sensor circuit is connected with an external steering switch, and the output end of the main control and sensor circuit is connected with the first switch control unit so as to output a turn-off signal instruction to control turn-off of a steering lamp; the master control and sensor circuit comprises a timing unit, and when the turn-on time of the turn light exceeds the set time, a turn-off signal instruction is output to control the turn light to be turned off. The turn signal lamp is controlled to be turned off through the timing unit, and when the turn signal lamp is not turned off after the preset time of the vehicle, the turn signal lamp is controlled to be automatically turned off.

Description

Technical Field

[0001] The utility model relates to the technical field of automotive electronics, and more specifically, to a vehicle steering signal automatic recognition control circuit. Background Art

[0002] In the modern road traffic system, the vehicle turn signal is an important tool for communication between vehicles and plays an irreplaceable role in maintaining traffic order and preventing traffic accidents. The driver's inaccurate, untimely, and ineffective use of the vehicle turn signal control device is an important cause of traffic accidents. Currently, the main method of using the on-vehicle turn signal is to manually move up and down the light signal control lever installed under the vehicle steering wheel to turn on and off the required turn signal.

[0003] However, the above method of manually controlling the turn signal has great defects and disadvantages. Specifically, in the specific application of the above control method, there is only a manual light signal control lever, and its application can only be realized by manual methods to turn on and off the turn signal.

[0004] During actual driving, the driver is prone to accidentally turn on the turn signal due to negligence or misjudgment. When the vehicle steering angle is small or has not fully reached the predetermined direction, the turn signal will not automatically turn off, and the driver will forget to turn off the turn signal, resulting in the turn signal being inconsistent with the actual vehicle driving trajectory. This inconsistency will not only cause confusion and misguidance to the driver of the following vehicle, but may also trigger unnecessary driving behaviors such as emergency braking and avoidance, thereby increasing the risk of traffic accidents. Summary of the Utility Model

[0005] In order to overcome the problem that when the existing vehicle steering angle is small or has not fully reached the predetermined direction, the turn signal will not automatically turn off, and the driver will forget to turn off the turn signal, resulting in the turn signal being inconsistent with the actual vehicle driving trajectory, the utility model provides a vehicle steering signal automatic recognition control circuit.

[0006] The technical solution of the utility model is as follows:

[0007] A vehicle steering signal automatic recognition control circuit includes an input interface circuit, a main control and sensor circuit, and a first switch control unit;

[0008] The input interface circuit is connected to an external steering switch, and the output end of the input interface circuit is connected to the first switch control unit to obtain a steering signal command through the steering switch and control the turn signal of the first switch control unit to turn on or off;

[0009] The master control and sensor circuit is connected to an external steering switch for obtaining a steering signal command. The output end of the master control and sensor circuit is connected to the first switch control unit to output a turn signal off command for controlling the turn signal of the first switch control unit to turn off;

[0010] The master control and sensor circuit includes a timing unit for calculating time. When the turn signal on time exceeds the set time, a turn signal off command is output to control the turn signal to turn off.

[0011] The utility model according to the above solution further includes a second switch control unit, and the second switch control unit connects the external steering switch to the input end of the master control and sensor circuit.

[0012] The utility model according to the above solution further includes a power conversion circuit, and the power conversion circuit is respectively connected to the master control and sensor circuit, the first switch control unit, and the second switch control unit.

[0013] In the utility model according to the above solution, the power conversion circuit includes a first chip U1, a second chip U2, and an LC filter circuit. The first chip U1 is connected to the power input terminal VCC-IN, the second chip U2 is further connected to the LC filter circuit, and the LC filter circuit is connected to the second chip U2.

[0014] In the utility model according to the above solution, the LC filter circuit includes a first inductor L1 and a third capacitor C3. The first end of the first inductor L1 is connected to the second pin of the first chip U1, the second end of the first inductor L1, the first end of the third capacitor C3, and the first pin of the second chip U2 are interconnected, and the common end of the first inductor L1 and the third capacitor C3 is connected to the 5V voltage input terminal VDD5V.

[0015] In the utility model according to the above solution, the first switch control unit includes a second resistor, a MOS transistor, a relay, and a turn signal. The first end of the second resistor is connected to the output end of the master control and sensor circuit, the second end of the second resistor is connected to the gate of the MOS transistor, the drain of the MOS transistor, the positive electrode of the turn signal, and the eighth pin of the relay are interconnected, the source of the MOS transistor is grounded, the negative electrode of the turn signal and the first pin of the relay are both connected to the 5V voltage input terminal VDD5V, and the third pin and the fourth pin of the relay are both connected to the input interface circuit.

[0016] According to the present utility model of the above solution, the second switch control unit includes a sixth resistor, an eighth resistor, a fifth diode, and a sixth diode. One end of the sixth resistor, the input end of the steering signal command, and the first end of the eighth resistor are interconnected. The second end of the sixth resistor is connected to the 3.3V voltage input terminal Vdd3v3. The second end of the eighth resistor, the positive electrode of the fifth diode, the negative electrode of the sixth diode, and the input end of the main control and sensor circuit are interconnected. The negative electrode of the fifth diode is connected to the 3.3V voltage input terminal Vdd3v3, and the positive electrode of the sixth diode is grounded.

[0017] According to the present utility model of the above solution, the main control and sensor circuit includes a main control chip U3 and a sensor chip U4, and the main control chip U3 is connected to the sensor chip U4.

[0018] According to the present utility model of the above solution, the turn signal is a light-emitting diode.

[0019] According to the present utility model of the above solution, its beneficial effect lies in that the present utility model controls the turn signal to turn off through the timing unit. When the turn signal of the vehicle does not turn off after a predetermined time, it will control the automatic turn-off of the turn signal, thereby avoiding the problem that the turn signal is inconsistent with the actual driving trajectory of the vehicle. Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of the main control and sensor circuit of the present utility model;

[0021] Figure 2 It is a schematic structural diagram of the first switch control unit of the present utility model;

[0022] Figure 3 It is a schematic structural diagram of the second switch control unit of the present utility model;

[0023] Figure 4 It is a schematic structural diagram of the input interface circuit of the present utility model;

[0024] Figure 5 It is a schematic structural diagram of the power conversion circuit of the present utility model; Detailed Embodiment

[0025] In order to make the technical problems, technical solutions, and beneficial effects to be solved by the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the drawings and embodiments.

[0026] It should be noted that the terms "including" and "having" and any variations thereof in the description and claims of the present utility model are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally further include steps or units not listed, or may optionally further include other steps or units inherent to these processes, methods, products, or devices. Terms such as "arranged" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly defined. The orientations or positions indicated by terms such as "upper", "lower", "left", "right", "front", "rear", "bottom", etc. are based on the orientations or positions shown in the drawings, and are only for convenience of description and should not be construed as a limitation to the technical solution of the present application.

[0027] It should be noted that during actual driving, the driver is prone to accidentally turn on the turn signal due to negligence or misjudgment. When the steering angle of the vehicle is small or has not fully reached the predetermined direction, the turn signal will not automatically turn off, and the driver will forget to turn off the turn signal, resulting in the turn signal not being consistent with the actual driving trajectory of the vehicle. This inconsistency will not only cause confusion and misguidance to the drivers of following vehicles, but may also trigger unnecessary driving behaviors such as emergency braking and avoidance, thereby increasing the risk of traffic accidents.

[0028] As Figures 1 - 5 shown, the present embodiment provides an automatic recognition control circuit for vehicle turning signals. By controlling the turn signal to turn off through a timing unit, when the turn signal does not turn off after exceeding the predetermined time, it will control the automatic turn-off of the turn signal, thereby avoiding the problem that the turn signal is not consistent with the actual driving trajectory of the vehicle.

[0029] Specifically, it includes an input interface circuit, a main control and sensor circuit, and a first switch control unit; the input interface circuit is connected to an external steering switch, and the output end of the input interface circuit is connected to the first switch control unit to obtain a turn signal instruction through the steering switch and control the turn signal of the first switch control unit to turn on or off; the main control and sensor circuit is connected to an external steering switch for obtaining a turn signal instruction, and the output end of the main control and sensor circuit is connected to the first switch control unit to output a turn-off signal instruction to control the turn signal of the first switch control unit to turn off; the main control and sensor circuit includes a timing unit, and the timing unit is used to calculate the time. When the turn signal on time exceeds the set time, it outputs a turn-off signal instruction to control the turn signal to turn off.

[0030] Working principle: The driver operates the steering switch outside the vehicle. The input interface circuit obtains the steering signal instruction and outputs the steering signal instruction to the first switch control unit to control the turn signal in the first switch control unit to turn on. When it is necessary to manually turn off the turn signal, the driver operates the steering switch outside the vehicle again. The input interface circuit obtains the steering signal instruction again, and the output of the steering signal instruction is turned off. At this time, the turn signal is turned off.

[0031] The main control and sensor circuit is connected to the steering switch outside the vehicle to obtain the steering signal instruction. If the main control and sensor circuit detects the input steering signal instruction, the gyroscope inside it is initialized, and the reset initial angle is zero. As the vehicle direction changes, the angle recorded by the gyroscope changes accordingly. When the rotation angle of the gyroscope exceeds the set angle, a turn-off signal instruction is output to control the turn signal of the first switch control unit to turn off;

[0032] When the main control and sensor circuit detects the input steering signal instruction, the timing unit starts timing. The timing unit continuously monitors the on-time of the turn signal. If the steering switch is automatically or manually turned off within the specified time (such as after completing a turn), everything returns to normal; if it exceeds the set time (such as the driver forgets to turn it off), the next operation is entered. When the timing unit determines that the turn signal has been on for more than the set time, the main control and sensor circuit outputs a turn-off signal instruction to control the turn signal of the first switch control unit to turn off.

[0033] In one embodiment, a power conversion circuit is further included. The power conversion circuit is respectively connected to the main control and sensor circuit, the first switch control unit, and the second switch control unit. The power conversion circuit is an important part of the vehicle steering signal automatic recognition control circuit, responsible for converting the original power provided by the vehicle (such as 12V or 24V battery voltage) into the working voltages required by each component in the circuit to ensure the stable operation of the circuit.

[0034] Specifically, the power conversion circuit includes a first chip U1, a second chip U2, and an LC filter circuit. The first chip U1 is connected to the power input terminal VCC-IN. The second chip U2 is also connected to the LC filter circuit, and the LC filter circuit is connected to the second chip U2. The LC filter circuit is used to filter out high-frequency noise and ripple in the power supply and provide a clean and stable output voltage.

[0035] The LC filter circuit includes a first inductor L1 and a third capacitor C3. The first end of the first inductor L1 is connected to the second pin of the first chip U1. The second end of the first inductor L1, the first end of the third capacitor C3, and the first pin of the second chip U2 are interconnected, and the common end of the first inductor L1 and the third capacitor C3 is connected to the 5V voltage input terminal VDD5V.

[0036] When the vehicle power supply is turned on, the first chip U1 starts to work, stepping down the high voltage to an intermediate voltage suitable for subsequent processing. This voltage is then filtered by an LC filter circuit to remove high-frequency noise and ripple, and at this time, a working voltage of 5V is output. The filtered voltage is sent to the second chip U2 for further voltage reduction, and finally, a stable 3.3V voltage is output for use by each component in the circuit.

[0037] In one embodiment, the first switch control unit includes a second resistor, a MOS transistor, a relay, and a turn signal (first diode). The first end of the second resistor is connected to the output of the main control and sensor circuit, the second end of the second resistor is connected to the gate of the MOS transistor, the drain of the MOS transistor, the positive electrode of the first diode, and the eighth pin of the relay are interconnected, the source of the MOS transistor is grounded, the negative electrode of the first diode and the first pin of the relay are connected to the 5V voltage input terminal VDD5V, and the third pin and the fourth pin of the relay are both connected to the input interface circuit.

[0038] Specifically, the turn signal is turned off when the input interface circuit closes its output (the input interface circuit closes its output when a secondary input turn signal command is received). After the output of the main control and sensor circuit causes the MOS transistor to turn on, the turn signal is turned off.

[0039] Preferably, the first diode is a light-emitting diode.

[0040] In one embodiment, the second switch control unit includes a sixth resistor, an eighth resistor, a fifth diode, and a sixth diode. One end of the sixth resistor, the input terminal of the turn signal on or off command, and the first end of the eighth resistor are interconnected. The second end of the sixth resistor is connected to the 3.3V voltage input terminal Vdd3v3. The second end of the eighth resistor, the positive electrode of the fifth diode, the negative electrode of the sixth diode, and the input terminal of the main control and sensor circuit are interconnected. The negative electrode of the fifth diode is connected to the 3.3V voltage input terminal Vdd3v3, and the positive electrode of the sixth diode is grounded.

[0041] The sixth resistor and the eighth resistor form a voltage-dividing circuit, whose function is to adjust the signal voltage received from the input terminal of the turn signal on or off command to ensure that the main control and sensor circuit receives a stable voltage signal suitable for processing. The fifth diode serves as a forward protection diode, and the sixth diode is a reverse protection diode, playing a certain role in signal rectification to ensure that only positive signals can be transmitted to the input terminal of the main control and sensor circuit.

[0042] In one embodiment, the main control and sensor circuit includes a main control chip U3 and a sensor chip U4. The main control chip U3 is connected to the sensor chip U4, and the main control chip U3 is connected to the turn signal.

[0043] The input interface circuit includes R_IN and L_IN as switch inputs. When R_IN inputs a low level once, R_out outputs. When R_IN inputs a low level for the second time, R_out closes the output. L_IN corresponds to the left side and has the same function as the right side.

[0044] If only R_IN or L_IN is in the input state, when the input state is detected, the gyroscope sensor chip U4 is initialized, and the initial reset angle is zero. As the direction of the vehicle changes, the angle recorded by the gyroscope changes accordingly. The angle is positive in the clockwise direction and negative in the counterclockwise direction. There are the following several action modes:

[0045] 1. Vehicle no rotation timeout:

[0046] When R_IN or L_IN is detected, the corresponding output is opened, and the timing unit is started, and the angle change of the vehicle is detected. If the cumulative action angle of the vehicle is always not greater than 3°, it is considered that there is no action. After the timing unit times out for 180 seconds, a close signal instruction is output. During the period of no action, if a steering signal instruction input is detected again, different controls will be performed according to whether the input is the same as the previous one. If the input steering signal instruction is in the same steering direction, the output is closed; if the input steering signal instruction is in a different steering direction, the above operation is performed again.

[0047] 2. Steering back to the straight position after turning:

[0048] When R_IN or L_IN is detected, the corresponding output is opened, and the timing unit is started, and the angle change of the vehicle is detected. After it is detected that the cumulative action of the vehicle exceeds 3° and then returns to less than 3°, it is considered that the vehicle has steered back to the straight position, and a close signal instruction is output.

[0049] 3. No action timeout after action:

[0050] When R_IN or L_IN is detected, the corresponding output is opened, and the timing unit is started, and the angle change of the vehicle is detected. After it is detected that the cumulative action of the vehicle exceeds 3°, and then no change in the vehicle direction position is detected anymore. After the timing unit times out for 180 seconds, a close signal instruction is output.

[0051] 4. Always in the steering state timeout:

[0052] When R_IN or L_IN is detected, the corresponding output is opened, and the timing unit is started, and the angle change of the vehicle is detected. After it is detected that the cumulative action of the vehicle exceeds 3°, and it is detected that the vehicle action is always in a changing state, the output is closed after 300 seconds (5 minutes) at most.

[0053] It should be understood that for those of ordinary skill in the art, improvements or transformations can be made according to the above description, and all such improvements and transformations should fall within the protection scope of the appended claims of the present utility model.

[0054] The above has given an exemplary description of the patent of the present utility model in conjunction with the accompanying drawings. Obviously, the implementation of the patent of the present utility model is not limited by the above-mentioned manner. As long as various improvements are made by adopting the method concept and technical solution of the patent of the present utility model, or the concept and technical solution of the patent of the present utility model are directly applied to other occasions without improvement, they are all within the protection scope of the present utility model.

Claims

1. A vehicle turn signal automatic recognition control circuit, characterized in that: It includes an input interface circuit, a main control and sensor circuit, and a first switch control unit; The input interface circuit is connected to an external steering switch, and the output end of the input interface circuit is connected to the first switch control unit to obtain a steering signal instruction through the steering switch and control the turn signal of the first switch control unit to turn on or off; The main control and sensor circuit is connected to an external steering switch to obtain a steering signal instruction, and the output end of the main control and sensor circuit is connected to the first switch control unit to output a closing signal instruction to control the first switch control unit to turn off the steering light; The main control and sensor circuit includes a timing unit, which is used to calculate time. When the turn signal light is turned on for more than a set time, a closing signal instruction is output to control the turn signal light to be turned off.

2. A vehicle turn signal automatic recognition control circuit according to claim 1, characterized in that: It also includes a second switch control unit, which connects the external steering switch with the input end of the main control and sensor circuit.

3. A vehicle turn signal automatic recognition control circuit according to claim 2, characterized in that: It also includes a power conversion circuit, which is connected to the main control and sensor circuits, the first switch control unit and the second switch control unit respectively.

4. A vehicle turn signal automatic recognition control circuit according to claim 3, characterized in that: The power conversion circuit includes a first chip U1, a second chip U2 and an LC filter circuit. The first chip U1 is connected to a power input terminal VCC-IN. The first chip U1 is also connected to the LC filter circuit. The LC filter circuit is connected to the second chip U2.

5. A vehicle turn signal automatic recognition control circuit according to claim 4, characterized in that: The LC filter circuit includes a first inductor L1 and a third capacitor C3, the first end of the first inductor L1 is connected to the second pin of the first chip U1, the second end of the first inductor L1, the first end of the third capacitor C3 and the first pin of the second chip U2 are interconnected, and the common end of the first inductor L1 and the third capacitor C3 is connected to the 5V voltage input terminal VDD5V.

6. A vehicle turn signal automatic recognition control circuit according to any one of claims 2 to 5, characterized in that: The first switch control unit includes a second resistor, a MOS tube, a relay and a turn signal. The first end of the second resistor is connected to the output end of the main control and sensor circuit, the second end of the second resistor is connected to the gate of the MOS tube, the drain of the MOS tube, the positive electrode of the turn signal and the eighth pin of the relay are interconnected, the source of the MOS tube is grounded, the negative electrode of the turn signal and the first pin of the relay are both connected to the 5V voltage input terminal VDD5V, and the third pin and the fourth pin of the relay are both connected to the input interface circuit.

7. A vehicle turn signal automatic recognition control circuit according to claim 6, characterized in that: The second switch control unit includes a sixth resistor, an eighth resistor, a fifth diode and a sixth diode. One end of the sixth resistor, the input end of the turn signal command and the first end of the eighth resistor are interconnected. The second end of the sixth resistor is connected to the 3.3V voltage input terminal Vdd3v3. The second end of the eighth resistor, the positive electrode of the fifth diode, the negative electrode of the sixth diode and the input end of the main control and sensor circuit are interconnected. The negative electrode of the fifth diode is connected to the 3.3V voltage input terminal Vdd3v3. The positive electrode of the sixth diode is grounded.

8. A vehicle turn signal automatic recognition control circuit according to claim 1, 2, 3, 4, 5 or 7, characterized in that: The main control and sensor circuit includes a main control chip U3 and a sensor chip U4, and the main control chip U3 is connected to the sensor chip U4.

9. The vehicle turn signal automatic recognition control circuit according to claim 6, characterized in that: The turn signal lamp is a light emitting diode.

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