A daytime position lamp control circuit and a vehicle body control system

Abstract

A daytime running position lamp control circuit and a vehicle body control system according to the present invention include: a switching tube connected to a first input signal and a position lamp control signal respectively, and the switching state of the switching tube is controlled by the position lamp control signal; an intelligent power switch module connected to the first input signal, the switching tube, the position lamp control signal and the daytime running position lamp respectively, and based on the switching state of the switching tube, controls the working state of the daytime running position lamp according to the first input signal or the position lamp control signal; a buck module connected to the intelligent power switch module and the daytime running position lamp respectively, and used for performing buck processing when the position lamp control signal is an on signal. The present invention can control the daytime running position lamp to realize the functions of a daytime running lamp and a front position lamp, and reduce the brightness of the daytime running position lamp when needed; at the same time, it can improve the service life of the daytime running position lamp and accurately detect whether the daytime running position lamp is normal.

Description

Technical Field

[0001] The present invention relates to the field of automobiles, and particularly to a daytime running position lamp control circuit and a vehicle body control system. Background Art

[0002] In order to ensure the driving safety of vehicles, more and more vehicles are equipped with daytime running lamps, which are generally installed on both sides of the front end of the vehicle. Correspondingly, the front position lamps of general vehicles are also installed on both sides of the front end of the vehicle. Therefore, in order to save costs, many automobile manufacturers design the daytime running lamps and the front position lamps to be shared (such as unified as daytime running position lamps). However, daytime running lamps belong to high-brightness lamps. If the same brightness is used at night, it will cause dizziness to the oncoming drivers and affect driving safety. To solve this problem, the prior art generally uses PWM to control the duty cycle to output the brightness of the lamp. Although the brightness of the lamp can be adjusted by using PWM control and the brightness of the lamp can be reduced at night, there are the following disadvantages in using PWM control: (1) it will affect the service life of the daytime running position lamp; (2) since PWM will generate a certain frequency, it will interfere with other circuits, resulting in unstable performance; (3) PWM is a fluctuating signal, and the feedback acquisition of the output power signal is inaccurate. Summary of the Invention

[0003] The main object of the present invention is to provide a daytime running position lamp control circuit and a vehicle body control system, which can control the daytime running position lamp to realize the functions of the daytime running lamp and the front position lamp, and reduce the brightness of the daytime running position lamp when needed (such as at night or in dark daytime), which not only saves costs but also ensures driving safety; at the same time, it can improve the service life of the daytime running position lamp and accurately detect whether the daytime running position lamp is normal.

[0004] The present invention adopts the following technical solutions:

[0005] On the one hand, a daytime running position lamp control circuit includes:

[0006] A switching tube is respectively connected to a first input signal and a position lamp control signal; the switching state of the switching tube is controlled by the position lamp control signal;

[0007] An intelligent power switch module is respectively connected to the first input signal, the switching tube, the position lamp control signal and the daytime running position lamp; based on the switching state of the switching tube, the working state of the daytime running position lamp is controlled according to the first input signal or the position lamp control signal;

[0008] A buck module is respectively connected to the intelligent power switch module and the daytime running position lamp, and is used for performing buck processing when the position lamp control signal is an enabling signal to adjust the working brightness of the daytime running position lamp.

[0009] Preferably, the first input signal includes a power supply; the daytime position lamp control circuit further includes a sixth resistor; the power supply is connected to the intelligent power switch module through the sixth resistor.

[0010] Preferably, the first input signal includes a daytime running lamp control signal; the daytime position lamp control circuit further includes a seventh resistor; the daytime running lamp control signal is connected to the intelligent power switch module through the seventh resistor.

[0011] Preferably, the daytime position lamp control circuit further includes a fifth resistor; the position lamp control signal is connected to the intelligent power switch module through the fifth resistor.

[0012] Preferably, the intelligent power switch module includes a first input port, a second input port, a first output port, and a second output port;

[0013] The first input port is connected to the first input signal and the switching tube, and the first output port is connected to the daytime position lamp; the second input port is connected to the position lamp control signal, and the second output port is connected to the daytime position lamp through the buck module;

[0014] Or;

[0015] The first input port is connected to the position lamp control signal, and the first output port is connected to the daytime position lamp through the buck module; the second input port is connected to the first input signal and the switching tube, and the second output port is connected to the daytime position lamp.

[0016] Preferably, the daytime position lamp control circuit further includes a first diode and a second diode; one output port of the intelligent power switch module is connected to the daytime position lamp through the first diode; the other output port of the intelligent power switch module is connected to the daytime position lamp through the buck module and the second diode.

[0017] Preferably, the intelligent power switch module further includes a load current detection port; the load current detection port is connected to the MCU control unit, and the MCU control unit detects whether the daytime position lamp is normal through the load current detection port.

[0018] Preferably, the switching tube is a triode.

[0019] Preferably, the daytime position lamp control circuit further includes a first capacitor; the base of the triode is grounded through the first capacitor.

[0020] On the other hand, a vehicle body control system includes an MCU control unit and also includes the above-described daytime position lamp control circuit; the daytime position lamp control circuit is connected to the MCU control unit.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] (1) By the combined use of a switching tube, an intelligent power switch module, a buck module, a first input signal, and a position lamp control signal, the present invention can control the daytime position lamp to simultaneously realize the functions of a daytime running lamp and a front position lamp, and reduce the brightness of the daytime position lamp when needed (such as at night or on a dark day), which not only saves costs but also ensures driving safety; at the same time, the service life of the daytime position lamp can be extended.

[0023] (2) The first input signal of the present invention includes a power supply and a daytime running lamp control signal, so it can meet the requirements of two application scenarios; when the first input signal is the power supply, the daytime position lamp can be automatically turned on when the vehicle starts, ensuring driving safety; when the first input signal is the daytime running lamp control signal, the daytime position lamp is turned on only when needed, such as when the vehicle has a driving action or meets a certain vehicle speed, reducing power consumption.

[0024] (3) The first capacitor of the present invention can ensure stable voltage output when the triode switches its state, avoiding possible flickering when the triode switches its state.

[0025] (4) The first diode and the second diode of the present invention can prevent voltage from being back-fed to the intelligent power switch module.

[0026] (5) The output of the intelligent power switch module of the present invention is in a stable state. Therefore, the feedback voltage output from the load current detection port of the intelligent power switch module to the MCU control unit is better than the feedback voltage of the PWM circuit, enabling the MCU control unit to accurately detect whether the daytime position lamp is normal.

[0027] The above description is only an overview of the technical solution of the present invention. In order to understand the technical means of the present invention more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features, and advantages of the present invention more obvious and understandable, the following specific embodiments of the present invention are listed.

[0028] Based on the following detailed description of the specific embodiments of the present invention in conjunction with the drawings, those skilled in the art will more clearly understand the above and other purposes, advantages, and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a circuit schematic diagram of Embodiment 1 of the present invention;

[0030] Figure 2 Circuit diagram of Embodiment 1 of the present invention;

[0031] Figure 3 Simplified circuit diagram of Embodiment 2 of the present invention;

[0032] Figure 4 Circuit diagram of Embodiment 2 of the present invention. Specific implementation manners

[0033] In order to make the technical solutions and advantages of the present invention clearer and more understandable, the following combines the accompanying drawings and implementation manners

[0034] to further elaborate on the present invention in detail. It should be understood that the specific implementation manners described herein are only used to explain the present invention illustratively and are not used to limit the protection scope of the present invention.

[0035] For the sake of simplicity and intuitiveness in description, the following elaborates on the solutions of the present invention by describing several representative implementation manners. A large number of details in the implementation manners are only used to help understand the solutions of the present invention. However, it is obvious that the implementation of the technical solutions of the present invention may not be limited to these details. In order to avoid unnecessarily obscuring the solutions of the present invention, some implementation manners are not described in detail but only the framework is given. Hereinafter, "including" means "including but not limited to", and "according to..." means "at least according to..., but not limited to only according to...". Due to the language habits of Chinese, when the quantity of a component is not specifically pointed out hereinafter, it means that the component can be one or more, or can be understood as at least one.

[0036] Embodiment 1

[0037] Refer to Figure 1 and Figure 2 As shown, a daytime position lamp control circuit of the present invention includes:

[0038] A switching transistor 12, which is respectively connected to a first input signal and a position lamp control signal 11; the switching state of the switching transistor 12 is controlled by the position lamp control signal 11;

[0039] An intelligent power switch module 13, which is respectively connected to the first input signal, the switching transistor 12, the position lamp control signal 11 and a daytime position lamp 15; based on the switching state of the switching transistor 12, the working state of the daytime position lamp 15 is controlled according to the first input signal or the position lamp control signal 11;

[0040] A buck module 14, which is respectively connected to the intelligent power switch module 13 and the daytime position lamp 15, and is used for performing buck processing when the position lamp control signal 11 is an enabling signal to adjust the working brightness of the daytime position lamp 15.

[0041] Specifically, in this embodiment, the first input signal includes a power supply; the daytime position light control circuit further includes a sixth resistor R6; the power supply is connected to the intelligent power switch module 13 through the sixth resistor R6.

[0042] This embodiment is designed to start the daytime position light 15 when the vehicle starts. After the vehicle is turned on, the vehicle can supply power to the daytime position light 15 through the sixth resistor R6. If the position light control signal 11 is at a low level, the intelligent power switch module 13 directly outputs to the daytime position light 15, and the daytime position light 15 is in a high-brightness state.

[0043] The daytime position light control circuit further includes a third resistor R3 and a fourth resistor R4. The power supply VCC is sequentially connected to the intelligent power switch module 13 through the sixth resistor R6, the third resistor R3, and the fourth resistor R4. The intelligent power switch module 13 outputs power from the corresponding output port to the daytime position light 15 to control the daytime position light 15 to be highly bright.

[0044] Further, when driving at night or in scenarios such as dark days, the position light control signal 11 is set to a high-level signal. At this time, the switching transistor 12 is turned on, and the output of the intelligent power switch module 13 is processed by the buck module 14 and then output to the daytime position light 15, and the brightness of the daytime position light 15 is reduced.

[0045] The position light control signal 11 can be issued by the MCU control unit 17. Specifically, in implementation, the MCU control unit 17 can automatically output a high-level control signal or a low-level control signal according to the ambient brightness. It can also be triggered by the driver. For example, a signal is sent to the MCU control unit 17 through a touch switch. After the MCU control unit 17 receives the driver's instruction, it controls the output of a high-level control signal or a low-level control signal.

[0046] The daytime position light control circuit further includes a fifth resistor R5; the position light control signal 11 is connected to the intelligent power switch module 13 through the fifth resistor R5.

[0047] Specifically, the intelligent power switch module 13 includes a first input port IN0, a second input port IN1, a first output port OUT0, and a second output port OUT1;

[0048] The first input port IN0 is connected to the first input signal and the switching transistor 12, and the first output port OUT0 is connected to the daytime position lamp 15; the second input port IN1 is connected to the position lamp control signal 11, and the second output port OUT1 is connected to the daytime position lamp 15 through the buck module 14;

[0049] Or;

[0050] The first input port IN0 is connected to the position lamp control signal 11, and the first output port OUT0 is connected to the daytime position lamp 15 through the buck module 14; the second input port IN1 is connected to the first input signal and the switching transistor 12, and the second output port OUT1 is connected to the daytime position lamp 15.

[0051] In this embodiment, the intelligent power switch module 13 (U1) is of the model BTS7020. The first input port IN0 is connected to the first input signal and the switching transistor 12, and the first output port OUT0 is connected to the daytime position lamp 15; the second input port IN1 is connected to the position lamp control signal 11, and the second output port OUT1 is connected to the daytime position lamp 15 through the buck module 14.

[0052] The intelligent power switch module 13 further includes a load current detection port IS; the load current detection port IS is connected to the MCU control unit 17, and the MCU control unit 17 detects whether the daytime position lamp 15 is normal through the load current detection port IS. See Figure 2 As shown, the load current detection port IS outputs to the MCU control unit 17 through the eighth resistor.

[0053] Since the output of the intelligent power switch module 13 in this embodiment is in a stable state, the feedback voltage output from the load current detection port IS of the intelligent power switch module 13 to the MCU control unit 17 is better than the feedback voltage of the PWM circuit, enabling the MCU control unit 17 to accurately detect whether the daytime position lamp 15 is normal.

[0054] The intelligent power switch module 13 further includes a power supply port VS. In this embodiment, the power supply port is connected to the power supply VCC.

[0055] Specifically, the switching transistor 12 is a triode Q1, and the triode Q1 includes an NPN triode Q1 or a PNP triode Q1. In this embodiment, the triode Q1 is an NPN triode Q1.

[0056] The daytime position light control circuit further includes a first resistor R1 and a second resistor R2. The position light control signal is connected to the base of the triode Q1 through the first resistor R1, and the base of the triode Q1 is also grounded through the second resistor R2.

[0057] The daytime position light control circuit further includes a first capacitor C1; the base of the triode Q1 is grounded through the first capacitor C1. The first capacitor C1 can ensure stable voltage output when the triode Q1 switches its switch state (from closed to conducting or from conducting to closed), avoiding possible flickering when the triode Q1 switches its switch state.

[0058] Furthermore, the daytime position light control circuit further includes a first diode D1 and a second diode D2; an output port of the intelligent power switch module 13 is connected to the daytime position light 15 through the first diode D1; another output port of the intelligent power switch module 13 is connected to the daytime position light 15 through the buck module 14 and the second diode D2. In this embodiment, isolation processing is performed through the first diode D1 and the second diode D2, which can prevent voltage from being back-fed to the intelligent power switch module 13.

[0059] The buck module 14 (U2) can be implemented by using existing technologies, can be implemented by using a chip, or can be implemented through a circuit. In this embodiment, it is implemented by using an existing chip.

[0060] On the other hand, a vehicle body control system includes an MCU control unit 17 and further includes the daytime position light control circuit; the daytime position light control circuit is connected to the MCU control unit 17. The MCU control unit 17 can implement the functions in the daytime position light control circuit.

[0061] In this embodiment, after the vehicle is started, if the position light control signal 11 is a low-level signal, the triode Q1 is turned off, and the power supply is input to the first input port IN0 of the intelligent power switch module 13 through the sixth resistor R6, the third resistor R3, and the fourth resistor R4, triggering the first input port IN0 to be at a high level. At this time, the first output port OUT0 of the intelligent power switch module 13 outputs to the daytime running position light 15, controlling the daytime running position light 15 to be in a high-brightness state. After the vehicle is started, if the position light control signal 11 is a high-level signal, the triode Q1 is turned on, and the first input port IN0 of the intelligent power switch module 13 is pulled down to a low level. At this time, the first output port OUT0 of the intelligent power switch module 13 stops outputting. At the same time, the position light control signal 11 is input to the second input port IN1 of the intelligent power switch module 13 through the fifth resistor R5, triggering the second input port IN1 to be at a high level. At this time, the second output port OUT1 of the intelligent power switch module 13 outputs to the buck module 14, and the buck module 14 performs buck processing to control the daytime running position light 15 to reduce its brightness.

[0062] Embodiment 2

[0063] See Figure 3 and Figure 4 As shown in, a control circuit for a daytime running position light of the present invention includes:

[0064] A switching tube 12, connected to the first input signal and the position light control signal 11 respectively; the switching state of the switching tube 12 is controlled by the position light control signal 11;

[0065] An intelligent power switch module 13, connected to the first input signal, the switching tube 12, the position light control signal 11, and the daytime running position light 15 respectively; based on the switching state of the switching tube 12, the working state of the daytime running position light 15 is controlled according to the first input signal or the position light control signal 11;

[0066] A buck module 14, connected to the intelligent power switch module 13 and the daytime running position light 15 respectively, for performing buck processing when the position light control signal 11 is an enabling signal to adjust the working brightness of the daytime running position light 15.

[0067] Specifically, in this embodiment, the first input signal includes a daytime running light control signal 16; the control circuit for the daytime running position light further includes a seventh resistor R7; the daytime running light control signal 16 is connected to the intelligent power switch module 13 through the seventh resistor R7.

[0068] In this embodiment, the daytime running position lamp 15 is designed to be started when the vehicle meets certain driving conditions (such as reaching a certain vehicle speed or manually started by the driver).

[0069] After the vehicle is turned on, if the daytime running lamp control signal 16 is at a high level and the position lamp control signal 11 is at a low level, the intelligent power switch module 13 directly outputs to the daytime running position lamp 15 to control the daytime running position lamp 15 to be in a high-brightness state.

[0070] The daytime running position lamp control circuit further includes a third resistor R3 and a fourth resistor R4. The power supply is sequentially connected to the intelligent power switch module 13 through the seventh resistor R7, the third resistor R3, and the fourth resistor R4. The intelligent power switch module 13 outputs power from the corresponding output port to the daytime running position lamp 15 to control the daytime running position lamp 15 to be highly bright.

[0071] Further, when driving at night or in scenes such as dark days, the position lamp control signal 11 is set to a high-level signal. At this time, the switching transistor 12 is turned on, and the output of the intelligent power switch module 13 is processed by the buck module 14 and then output to the daytime running position lamp 15, and the brightness of the daytime running position lamp 15 is reduced.

[0072] The daytime running lamp control signal 16 and the position lamp control signal 11 can be issued by the MCU control unit 17. Specifically, in implementation, the MCU control unit 17 can automatically output a high-level control signal or a low-level control signal according to the ambient brightness (vehicle speed). It can also be triggered by the driver. For example, a signal is sent to the MCU control unit 17 through a touch switch. After receiving the driver's instruction, the MCU control unit 17 controls the output of a high-level control signal or a low-level control signal.

[0073] The daytime running position lamp control circuit further includes a fifth resistor R5; the position lamp control signal 11 is connected to the intelligent power switch module 13 through the fifth resistor R5.

[0074] Specifically, the intelligent power switch module 13 includes a first input port IN0, a second input port IN1, a first output port OUT0, and a second output port OUT1;

[0075] The first input port IN0 is connected to the first input signal and the switching transistor 12, and the first output port OUT0 is connected to the daytime running position lamp 15; the second input port IN1 is connected to the position lamp control signal 11, and the second output port OUT1 is connected to the daytime running position lamp 15 through the buck module 14;

[0076] Or;

[0077] The first input port IN0 is connected to the position lamp control signal 11, and the first output port OUT0 is connected to the daytime running position lamp 15 through the buck module 14; the second input port IN1 is connected to the first input signal and the switching transistor 12, and the second output port OUT1 is connected to the daytime running position lamp 15.

[0078] In this embodiment, the intelligent power switch module 13 is of model BTS7020. The first input port IN0 is connected to the first input signal and the switching transistor 12, and the first output port OUT0 is connected to the daytime running position lamp 15; the second input port IN1 is connected to the position lamp control signal 11, and the second output port OUT1 is connected to the daytime running position lamp 15 through the buck module 14.

[0079] The intelligent power switch module 13 further includes a load current detection port IS; the load current detection port IS is connected to the MCU control unit 17, and the MCU control unit 17 detects whether the daytime running position lamp 15 is normal through the load current detection port IS. See Figure 4 As shown, the load current detection port IS outputs to the MCU control unit 17 through the eighth resistor.

[0080] Since the output of the intelligent power switch module 13 in this embodiment is in a stable state, the feedback voltage output from the load current detection port IS of the intelligent power switch module 13 to the MCU control unit 17 is better than the feedback voltage of the PWM circuit, enabling the MCU control unit 17 to accurately detect whether the daytime running position lamp 15 is normal.

[0081] The intelligent power switch module 13 further includes a power supply port VS. In this embodiment, the power supply port is connected to the power supply VCC.

[0082] Specifically, the switching transistor 12 is a triode Q1, and the triode Q1 includes an NPN triode Q1 or a PNP triode Q1. In this embodiment, the triode Q1 is an NPN triode Q1.

[0083] The daytime running position lamp control circuit further includes a first resistor R1 and a second resistor R2. The position lamp control signal is connected to the base of the triode Q1 through the first resistor R1, and the base of the triode Q1 is also grounded through the second resistor R2.

[0084] The daytime position light control circuit further includes a first capacitor C1; the base of the triode Q1 is grounded through the first capacitor C1. The first capacitor C1 can ensure stable voltage output when the triode Q1 switches its switch state (from closed to conducting or from conducting to closed), avoiding possible flickering of the triode Q1 when switching the switch state.

[0085] Further, the daytime position light control circuit further includes a first diode D1 and a second diode D2; an output port of the intelligent power switch module 13 is connected to the daytime position light 15 through the first diode D1; another output port of the intelligent power switch module 13 is connected to the daytime position light 15 through the buck module 14 and the second diode D2. In this embodiment, isolation processing is performed through the first diode D1 and the second diode D2, which can prevent voltage from being back-fed to the intelligent power switch module 13.

[0086] The buck module 14 (U2) can be implemented by using existing technologies, can be implemented by using a chip, or can be implemented through a circuit. In this embodiment, an existing chip is used for implementation.

[0087] On the other hand, a vehicle body control system includes an MCU control unit 17 and further includes the daytime position light control circuit; the daytime position light control circuit is connected to the MCU control unit 17. The MCU control unit 17 can implement the functions in the daytime position light control circuit.

[0088] In this embodiment, after the vehicle is started, if the daytime running light control signal 16 is a high-level signal and the position light control signal 11 is a low-level signal, the triode Q1 is cut off, and the daytime running light control signal 16 is input to the first input port IN0 of the intelligent power switch module 13 through the seventh resistor R7, the third resistor R3, and the fourth resistor R4, triggering the first input port IN0 to be at a high level. At this time, the first output port OUT0 of the intelligent power switch module 13 outputs to the daytime position light 15 to control the daytime position light 15 to be in a high-brightness state. After the vehicle is started, if the position light control signal 11 is a high-level signal, the triode Q1 is turned on, and the first input port IN0 of the intelligent power switch module 13 is pulled down to a low level. At this time, the first output port OUT0 of the intelligent power switch module 13 stops outputting. At the same time, the position light control signal 11 is input to the second input port IN1 of the intelligent power switch module 13 through the fifth resistor R5, triggering the second input port IN1 to be at a high level. At this time, the second output port OUT1 of the intelligent power switch module 13 outputs to the buck module 14, and the buck module 14 performs buck processing and then controls the daytime position light 15 to reduce its brightness.

[0089] It should be noted that the above two control circuits can be implemented on different vehicles according to different user requirements and vehicle models respectively, or the above two control circuits can be implemented simultaneously on the same vehicle.

[0090] The above are only specific embodiments of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantive modification of the present invention using this concept shall fall within the scope of infringement of the protection scope of the present invention.

Claims

1. A daytime running position light control circuit, characterized in that, it includes: A switching tube, connected to the first input signal and the position light control signal respectively; The switching state of the switching tube is controlled by the position light control signal; An intelligent power switch module, connected to the first input signal, the switching tube, the position light control signal and the daytime running position light respectively; based on the switching state of the switching tube, control the working state of the daytime running position light according to the first input signal or the position light control signal; A buck module, connected to the intelligent power switch module and the daytime running position light respectively, for performing buck processing when the position light control signal is an on signal to adjust the working brightness of the daytime running position light; The intelligent power switch module includes a first input port, a second input port, a first output port and a second output port; The first input port is connected to the first input signal and the switching tube, and the first output port is connected to the daytime running position light; the second input port is connected to the position light control signal, and the second output port is connected to the daytime running position light through the buck module; Or; The first input port is connected to the position light control signal, and the first output port is connected to the daytime running position light through the buck module; the second input port is connected to the first input signal and the switching tube, and the second output port is connected to the daytime running position light.

2. The daytime running position light control circuit according to claim 1, characterized in that, The first input signal includes a power supply; the daytime running position light control circuit further includes a sixth resistor; the power supply is connected to the intelligent power switch module through the sixth resistor.

3. The daytime running position light control circuit according to claim 1, characterized in that, The first input signal includes a daytime running light control signal; the daytime running position light control circuit further includes a seventh resistor; the daytime running light control signal is connected to the intelligent power switch module through the seventh resistor.

4. The daytime running position light control circuit according to claim 1, characterized in that, It further includes a fifth resistor; the position light control signal is connected to the intelligent power switch module through the fifth resistor.

5. The daytime running position light control circuit according to claim 4, characterized in that, The daytime running position light control circuit further includes a first diode and a second diode; one output port of the intelligent power switch module is connected to the daytime running position light through the first diode; the other output port of the intelligent power switch module is connected to the daytime running position light through the buck module and the second diode.

6. The daytime running position light control circuit according to claim 1, characterized in that, The intelligent power switch module further includes a load current detection port; the load current detection port is connected to the MCU control unit, and the MCU control unit detects whether the daytime running position light is normal through the load current detection port.

7. The daytime running position light control circuit according to claim 1, It is characterized in that the switching tube is a triode.

8. The daytime position lamp control circuit according to claim 7, It is characterized in that it further includes a first capacitor; the base of the triode is grounded through the first capacitor.

9. A vehicle body control system includes an MCU control unit, It is characterized in that it further includes the daytime position lamp control circuit according to any one of claims 1 to 8; the daytime position lamp control circuit is connected to the MCU control unit.

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