Vehicle lamp detection circuit and vehicle control system

Abstract

The utility model provides a vehicle lamp detection circuit and a vehicle control system. The vehicle lamp detection circuit comprises a control module, M vehicle lamp test modules, M conduction driving modules, an operational amplification module and a conversion module, the control module is used for providing regulation and control signals to the vehicle lamp testing modules, providing conduction signals to the conduction driving module and feeding back the signals so as to judge whether the actual current values of the vehicle lamp testing modules are equal to preset current values corresponding to the regulation and control signals or not; each vehicle lamp test module receives the regulation and control signal to provide a corresponding preset current value, so that the correspondingly controlled vehicle lamp is turned on; each conduction driving module receives the conduction signal so as to output the actual current value of the corresponding vehicle lamp test module; and the operational amplification module and the conversion module are used for sampling and amplifying the output signal of the conduction driving module to obtain a feedback signal. The device is used for accurately measuring the current of the vehicle lamp in different working modes so as to evaluate the performance and the safety of the vehicle lamp.

Description

Technical Field

[0001] The utility model relates to the field of vehicle lamp lighting, in particular to a vehicle lamp detection circuit and a vehicle control system. Background Art

[0002] As the application of LED lights in automobiles becomes more comprehensive, matrix lights, ambient lights, taillights and other colorful intelligent scene applications emerge in an endless stream, and the lighting system has become more complex, which requires more accurate and scientific testing methods to ensure its performance. The normal operation of the lights depends on a stable and appropriate current supply. Excessive current may cause the LED to overheat or even damage, while too little current will result in poor lighting effects, affecting driving safety and visual experience. Therefore, accurate testing of the current of the lights can ensure that the lights achieve optimal performance during design and use, extend service life, and reduce failure rates.

[0003] With the development of automotive electronic technology, headlight systems are increasingly dependent on complex electronic control units (ECUs) and software to manage. The complexity of these systems increases the requirements for headlight current testing technology, and traditional testing methods may not be able to meet the testing needs of modern automotive headlight systems.

[0004] Therefore, an efficient and accurate vehicle lamp current test system is particularly important. The system needs to be able to simulate various conditions in actual use and accurately measure the current of vehicle lamps in different working modes to evaluate their performance and safety.

[0005] It should be noted that the above introduction to the technical background is only for the convenience of providing a clear and complete description of the technical solutions of the present application and for the convenience of understanding by those skilled in the art. It cannot be considered that the above technical solutions are well known to those skilled in the art simply because they are described in the background technology section of the present application. Utility Model Content

[0006] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a headlight detection circuit and a vehicle control system, which are used to solve the problem that the traditional testing method in the prior art may not meet the testing requirements of modern automobile headlight systems.

[0007] In order to achieve the above-mentioned purpose and other related purposes, the utility model provides a vehicle lamp detection circuit, a control module, M vehicle lamp test modules, M conduction drive modules, an operational amplifier module and a conversion module; M is an integer greater than or equal to 1;

[0008] The control module is used to provide a control signal to each vehicle lamp test module, and to provide a conduction signal to each conduction drive module; the control module is also used to receive a feedback signal output by the conversion module, and to determine whether the actual current value of the vehicle lamp test module is equal to the preset current value corresponding to the control signal based on the magnitude of the feedback signal;

[0009] Each vehicle lamp test module receives the control signal to provide a corresponding preset current value, thereby turning on the corresponding controlled vehicle lamp;

[0010] Each conduction driving module is arranged in one-to-one correspondence with each vehicle lamp test module; each conduction driving module receives the conduction signal to output the actual current value of the corresponding vehicle lamp test module to the operational amplifier module;

[0011] The operational amplifier module is connected to the reference voltage, receives the output signal of each conduction driving module, and samples and amplifies the output signal of the conduction driving module based on the reference voltage;

[0012] The conversion module receives the output signal of the operational amplifier module to obtain the feedback signal.

[0013] Optionally, the vehicle light detection circuit further includes a signal transceiver module; the signal transceiver module is arranged between the control module and each vehicle light test module, and is used to send and receive the control signal to the corresponding vehicle light test module in the form of a message signal.

[0014] Optionally, each vehicle lamp test module includes an LED driver chip and N LED lamps; N is an integer greater than or equal to 1;

[0015] The control end of each LED lamp is connected to the output end of the LED driver chip

[0016] The LED driving chip receives the control signal and turns on corresponding LED lamps based on the control signal.

[0017] Optionally, the vehicle lamp test module further includes a first power supply unit; the first power supply unit is connected to the LED driver chip to provide a preset current for each LED lamp.

[0018] Optionally, each conduction driving module is configured as a MOS tube; the control end of the MOS tube is connected to the conduction signal, the input end is connected to the corresponding vehicle light test module, and the output end is connected to the operational amplifier module.

[0019] Optionally, the operational amplifier module includes an operational amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a first capacitor and a second capacitor;

[0020] The first end of the first resistor receives the output signal of each conduction driving module, and the second end is grounded;

[0021] The second resistor and the third resistor are connected in series to form a first series structure;

[0022] The fourth resistor and the fifth resistor are connected in series to form a second series structure;

[0023] The first plate of the first capacitor is connected to a node between the second resistor and the third resistor, and the second plate is connected to a node between the fourth resistor and the fifth resistor;

[0024] The sixth resistor is connected in series with the reference voltage to form a third series structure;

[0025] The non-inverting input terminal of the operational amplifier is connected to the first end of the first resistor via the first series structure, the inverting input terminal is connected to the second end of the first resistor via the second series structure, and the output terminal is connected to the inverting input terminal of the operational amplifier via the seventh resistor; the non-inverting input terminal of the operational amplifier is also connected to the ground via the third series structure, and the output terminal is also connected to the first plate of the second capacitor via the eighth resistor;

[0026] The first plate of the second capacitor serves as the output end of the operational amplifier module, and the second plate is connected to the ground.

[0027] Optionally, the headlight detection circuit is also provided with an acoustic and visual warning module; the acoustic and visual warning module is connected to the control module, and is used to emit an acoustic signal and / or an optical signal warning when the actual current value of the headlight test module is not equal to the preset current value corresponding to the control signal.

[0028] Optionally, the vehicle light detection circuit is further provided with a host computer; the host computer is connected to the control module to regulate various signals of the control module.

[0029] Optionally, the control module includes a pulse width modulation unit, which outputs the control signal in the form of a square wave pulse wave with a preset bandwidth.

[0030] To achieve the above-mentioned purpose and other related purposes, the utility model provides a vehicle control system, including the vehicle light detection circuit.

[0031] As described above, the vehicle light detection circuit and vehicle control system of the present invention have the following beneficial effects:

[0032] 1. The vehicle light detection circuit and vehicle control system of the present invention can control the vehicle lights in different working modes, and realize long-term monitoring of the vehicle lights by setting preset control signals based on the control module, or perform short-term detection of the vehicle lights at specific positions; at the same time, the conduction drive module, operational amplifier module and conversion module based on the present invention not only have fast working frequency and high sampling accuracy, but also can realize intuitive viewing, clear processing, and easy recording and analysis based on the host computer.

[0033] 2. The vehicle lamp detection circuit and vehicle control system of the present invention are of great significance for improving the performance of vehicle lamps, ensuring driving safety and meeting the high standards of the modern automobile industry. They can test the vehicle lamp current under different voltage and temperature conditions, thereby more comprehensively evaluating the performance of the vehicle lamps. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 Shown is a framework diagram of the vehicle light detection circuit of the present utility model.

[0035] Figure 2 Shown is a structural schematic diagram of the vehicle light detection circuit of the present utility model.

[0036] Figure 3 Shown is a structural schematic diagram of a PWM unit of the utility model.

[0037] Figure 4 Shown is a structural schematic diagram of a microcontroller-controlled vehicle light test module of the present utility model.

[0038] Figure 5 Shown is a structural schematic diagram of a microcontroller-controlled conduction drive module of the utility model.

[0039] Figure 6 Shown is a structural schematic diagram of an operational amplifier module of the utility model.

[0040] Component number description

[0041] 1. Car light detection circuit

[0042] 11 Control Module

[0043] 111 Pulse Width Modulation Unit

[0044] 12 Headlight Test Module

[0045] 13. Conduction drive module

[0046] 14 Operational amplifier module

[0047] 141 Operational Amplifier

[0048] 15 Conversion Module

[0049] 16 Sound and light warning module

[0050] 17 Host computer

[0051] 18 Signal transceiver module

[0052] 19 DC power supply

[0053] 191 First power supply unit DETAILED DESCRIPTION

[0054] The following is an explanation of the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0055] See also Figure 1 to Figure 6 It should be noted that the illustrations provided in this embodiment are only used to schematically illustrate the basic concept of the utility model, and the drawings only show the components related to the utility model rather than the number, shape and size of the components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0056] Example

[0057] like Figure 1 As shown, this embodiment provides a vehicle lamp detection circuit 1, comprising: a control module 11, M vehicle lamp test modules 12, M conduction drive modules 13, an operational amplifier module 14 and a conversion module 15; M is an integer greater than or equal to 1.

[0058] like Figure 1 and Figure 2 As shown, the control module 11 is used to provide a control signal to each headlight test module 12, and to provide a conduction signal to each conduction drive module 13; the control module 11 is also used to receive a feedback signal output by the conversion module 15, and to determine whether the actual current value of the headlight test module is equal to the preset current value corresponding to the control signal based on the size of the feedback signal.

[0059] Specifically, in this embodiment, Figure 2As shown, M is set to 1, and the control module 11 is set to a microcontroller unit (MCU). The headlight test module 12 is turned on by outputting a control signal, so that the headlight is illuminated; and the actual current value in the headlight test system corresponding to the turned-on driving module 13 can be collected by outputting a turn-on signal to the turn-on driving module 13.

[0060] As an example, Figure 3 As shown, the control module 11 includes a pulse width modulation unit 111 (Pulse-Width Modulation, PWM), which outputs the conduction signal in the form of a square wave pulse wave with a preset bandwidth. Since the working voltage used by the vehicle LED in different models and different positions will also be different, this embodiment provides multiple sets of voltages for the vehicle light test module 12 to select, and the control module 11 controls the pulse width modulation to control the conduction and closing of the conduction drive module 13, thereby dynamically adjusting the input voltage of the vehicle light test module 12. In this embodiment, the regulated working voltage after modulation by the pulse width modulation unit 111 is less than or equal to the initial voltage. For example, by adjusting the duty cycle of the conduction signal, that is, adjusting the proportion of the conduction signal to the conduction time / off time of the conduction drive module 13, a square wave signal with a frequency of 10KHz and a duty cycle of 50% can be output to the conduction drive module 13; if the power supply voltage is 12V, the working voltage of the vehicle light test module 12 will be 12V / 2=6V, so as to realize dynamic regulation of the voltage.

[0061] like Figure 2 As shown, the headlight detection circuit 1 is also provided with an acoustic and optical warning module 16; the acoustic and optical warning module 16 is connected to the control module 11, and is used to send an acoustic signal and / or an optical signal warning when the actual current value of the headlight test module 12 is not equal to the preset current value corresponding to the control signal. It should be noted that when the actual current value is within a certain preset range of the preset current value, the two are considered equal. Among them, the preset range can be selected based on actual needs.

[0062] Specifically, in this embodiment, when the control module 11 determines that the actual current value of the vehicle light test module 12 is not equal to the preset current value, it is considered that there is a problem with the corresponding vehicle light test module 12, and at least one of an acoustic signal or an optical signal is used to give an external prompt. In this embodiment, an indicator light and a buzzer can be set for prompting. In fact, other prompting methods can also be set, and are not limited to this embodiment.

[0063] like Figure 2As shown, the vehicle light detection circuit is further provided with a host computer 17; the host computer 17 is connected to the control module 11 to regulate various signals of the control module 11. The host computer 17 is at least used to provide a test enable signal to the control module 11 to start the current test.

[0064] Specifically, in this embodiment, Figure 4 As shown, the host computer 17 at least includes a current waveform display area and a current detection value receiving area to display the preset current value and the actual current value fed back, and can also record and save the current detection value and draw a current curve. At the same time, in this embodiment, when the output signal of the control module 11 is output to the headlight test module 12 through the signal transceiver module 18, the signal transceiver can be set to a message signal transmission mode of CAN communication or LIN communication. Based on this, the host computer can be set to also include a CAN / LIN message signal transceiver display area.

[0065] like Figure 1 and Figure 2 As shown, each vehicle lamp test module 12 receives the control signal to provide a corresponding preset current value, thereby turning on the corresponding controlled vehicle lamp.

[0066] Specifically, in the first example, Figure 4 As shown, each vehicle lamp test module 12 includes an LED driver chip and N LED lamps; N is an integer greater than or equal to 1; the control end of each LED lamp is connected to the output end of the LED driver chip; the LED driver chip receives the control signal and turns on the corresponding LED lamps based on the control signal.

[0067] In this example, based on an LED driver chip, it is possible to adjust whether the corresponding connected LED lamp is turned on and the current when it is turned on, that is, to adjust whether the corresponding connected LED emits light and the light intensity and light color of the light. For example, if the LED lamps are arranged in an orthogonal array, the LED driver chip can turn on any LED lamp in the array to emit light and adjust the light color and intensity of the LED lamp based on the current value when it is turned on.

[0068] In this embodiment, the vehicle lamp test module further includes a first power supply unit 191 ; the first power supply unit 191 is connected to the LED driver chip to provide a preset current value for each LED lamp.

[0069] In this embodiment, the headlight test module 12 may also be provided with a communication protocol driver chip, which selects the corresponding power supply voltage and communication protocol according to the headlight test module 12, and then sets the message signal based on the host computer of this embodiment, and sends the message signal set by the signal transceiver module 18 to the headlight test module based on the microcontroller. At the same time, the communication protocol driver chip parses the message signal and controls the headlight to collect the corresponding working current at the specified brightness to determine whether it meets the preset current value.

[0070] It should be noted that the communication protocol driver chip parses the message signal after receiving it. If the analysis is not completed or incorrect, the error information will be fed back to the microcontroller, which will facilitate subsequent sound and light alarms or host computer display, and finally facilitate manual troubleshooting and maintenance.

[0071] It should be further explained that the lamp test module 12 is controlled to turn on the corresponding lamp based on the set message signal, that is, different message signals will make the lamp work in different states (color, light intensity), and different states correspond to different current values, which are the theoretical standard current values. During the test, multiple sets of actual current values ​​can be collected and compared with the standard current values, and by comparing whether the errors of the multiple sets of actual current values ​​are within the set range, it can be determined whether the corresponding lamp is in a normal working state.

[0072] In another example, if Figure 5 As shown, the vehicle lamp test module 12 is only provided with N LED lamps. In this example, the corresponding power supply voltage is set by the vehicle lamp test module 12, and the control module 11 turns on the conduction drive module 13 to conduct the power supply of the vehicle lamp test module to the outside to form a loop, thereby ensuring that the working current of the vehicle lamp LED is collected.

[0073] It should be noted that the specific configuration of the headlight test module 12 is not limited to the above two examples. Any configuration that can turn on the corresponding headlight based on the control signal of the control module 11 and can collect the corresponding current based on the turn-on drive module 13 is within the protection scope of this embodiment. In addition, the number of headlight test modules 12 is not limited. In actual use, Figure 1 As shown, in this embodiment, since the operating frequency of the microcontroller is very high, multiple vehicle lamp test modules 12 can be connected simultaneously to perform current detection.

[0074] like Figure 1 and Figure 2 As shown, the vehicle light detection circuit 1 further includes a signal transceiver module 18 ; the signal transceiver module 18 is disposed between the control module 11 and each vehicle light test module 12 , and is used to send and receive control signals to the corresponding vehicle light test module 12 in the form of message signals.

[0075] Specifically, in this embodiment, when the signal transceiver module 18 outputs the output signal of the control module 11 to the headlight test module 12, the signal transceiver module mainly includes a CAN transceiver circuit and a LIN transceiver circuit; wherein the CAN transceiver circuit includes a CAN protocol chip, and the LIN transceiver circuit includes a LIN protocol chip. The CAN protocol chip and the LIN protocol chip communicate with the control module 11 through the UART protocol to receive the output signal from the control module 11, and convert the output signal into a specific message signal and send it to the headlight test module 12. Since different headlight test modules 12 support different communication protocols (different communication control methods are set based on the position of the headlight in the vehicle), it is necessary to select the corresponding signal transceiver circuit according to the headlight test module.

[0076] It should be noted that other methods may be provided for signal transmission, which are not limited to the present embodiment, such as directly transmitting the control signal to the vehicle light test module 12 , which is not limited to the method provided in the present embodiment.

[0077] like Figure 1 As shown, each conduction driving module 13 is disposed in one-to-one correspondence with each vehicle lamp test module 12 ; each conduction driving module 13 receives the conduction signal to output the actual current value of the corresponding vehicle lamp test module to the operational amplifier module 14 .

[0078] Specifically, each conduction driving module is configured as a MOS tube; the control end of the MOS tube is connected to the conduction signal, the input end is connected to the corresponding vehicle light test module 12 , and the output end is connected to the operational amplifier module 14 .

[0079] In this embodiment, the vehicle lamp test module 12 is connected to the conduction drive module 13 using a dedicated wiring harness that is resistant to high and low temperatures, so as to simulate the actual temperature conditions for current testing.

[0080] It should be noted that by using the MOS tube as the conduction setting, the conduction state of the MOS tube can be very accurately controlled by the gate voltage (Vgs) of the MOS tube, so as to achieve fast response and precise control of the signal during sampling. At the same time, due to its low on-resistance, it can effectively reduce the loss of the signal during the switching process and improve the sampling accuracy; compared with other switching or multi-way selection methods, it has higher accuracy.

[0081] like Figure 1 , Figure 2 and Figure 6 As shown, the operational amplifier module 14 is connected to the reference voltage VDC, and receives the output signal of each conduction driving module 13, and samples and amplifies the output signal of the conduction driving module 13 based on the reference voltage.

[0082] Specifically, in this embodiment, Figure 6 As shown, the operational amplifier module 14 includes an operational amplifier 141, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a first capacitor C1 and a second capacitor C2; the first end of the first resistor R1 receives the output signal of each conduction driving module 13, and the second end is grounded GND; the second resistor R2 and the third resistor R3 are connected in series as a first series structure; the fourth resistor R4 and the fifth resistor R5 are connected in series as a second series structure; the first plate of the first capacitor C1 is connected to the node between the second resistor R2 and the third resistor R3, and the second plate is connected to the fourth resistor R4 and The node between the fifth resistor R5; the sixth resistor R6 is connected in series with the reference voltage VDC as a third series structure; the non-inverting input terminal of the operational amplifier 141 is connected to the first end of the first resistor R1 via the first series structure, the inverting input terminal is connected to the second end of the first resistor R1 via the second series structure, and the output terminal is connected to the inverting input terminal of the operational amplifier 141 via the seventh resistor R7; the non-inverting input terminal of the operational amplifier 141 is also connected to the ground through the third series structure, and the output terminal is also connected to the first plate of the second capacitor C2 through the eighth resistor R8; the first plate of the second capacitor C2 serves as the output terminal of the operational amplifier module 141, and the second plate is connected to the ground.

[0083] In this embodiment, if Figure 5 As shown, Ii is the actual working current of the collected lamp, Vi is the required collected voltage, Vo is the voltage after Vi is amplified, and VDC is the bias voltage, which can be provided based on the second power supply unit (not shown in the figure) in this embodiment as the bias voltage of the in-phase input terminal of the operational amplifier.

[0084] The working process includes: when the driving control module is turned on (in this embodiment, the MOS tube is turned on), the current of the vehicle light test module 12 when working is collected, and the collected digital signal is output to the control module 11 for processing, wherein the relationship between the output voltage signal Vo of the operational amplifier module 14 and the input working current value Ii satisfies:

[0085]

[0086] In this embodiment, the actual current value is amplified by the operational amplifier module 14 and output as a voltage value, and the subsequent conversion module 15 performs signal conversion to facilitate the processing of the control signal 11.

[0087] It should be noted that, compared with some methods of using adjustable gain amplifiers to amplify signals and then transmitting signals to voltage followers through multi-way switching circuits, this signal reading and collection method may introduce sampling interference. However, since the present embodiment directly amplifies the sampled current value through in-phase amplification and collects the current by applying a reference voltage of VDC, it can ensure that the actual current value sampled is easy to collect and is more accurate and obvious.

[0088] If further explanation is needed, the first power supply unit 191 and the second power supply unit may be powered by the same power supply source, such as based on Figure 2 The DC power supply 19 may be generated based on different power sources. In this embodiment, the DC power supply 19 provides 3.3V and 1.2V voltages to the control module 11 and the conversion module, and provides 9V, 12V and 24V voltages to the headlight test module 12 for power supply. Different headlight test modules 12 may select corresponding working voltages for testing.

[0089] like Figure 1 As shown, the conversion module 15 receives the output signal of the operational amplifier module 14 to obtain the feedback signal.

[0090] Specifically, in this embodiment, the conversion module 15 is set to an ADC sampling chip. Preferably, it is set to a 24-bit high-precision ADC sampling chip. In this embodiment, the output voltage Vo of the operational amplifier module 14 after amplification is input to the ADC sampling chip, and the ADC sampling chip performs signal processing, converts the analog voltage into a digital voltage and transmits it to the control module 11 (a microcontroller in this embodiment), and then the microcontroller calculates the working current Ii of the headlight according to the digital value.

[0091] It should be noted that the sampling accuracy of the headlight detection circuit of this embodiment is relatively high. Excluding the influence of circuit component errors and environmental factors, the sampling accuracy of the circuit can reach 0.001mV, which can fully meet the accuracy requirements of headlight current testing.

[0092] The vehicle light detection circuit 1 of the present invention can control the vehicle lights in different working modes, and can realize long-term monitoring of the vehicle lights by setting preset control signals based on the control module 11, or can realize short-term detection of vehicle lights at specific positions by manual input based on the host computer; the conduction drive module 13, operational amplifier module 14 and conversion module 15 provided in this embodiment not only have fast working frequency and high sampling accuracy, but also can realize intuitive viewing, clear processing, and easy recording and analysis based on the host computer.

[0093] This embodiment also provides a vehicle control system, including the above-mentioned vehicle light detection circuit 1.

[0094] In this embodiment, by setting a headlight detection circuit 1 in the vehicle control system, on the one hand, when the headlights are necessary lights for vehicle driving, such as turn signal lights, brake signal lights, etc., the working state of the headlights directly affects driving safety, and detecting the headlights is an important measure to ensure driving safety; on the other hand, when the headlights are non-essential lights for vehicle driving, such as atmosphere lights, etc., the working state of the headlights is related to the user's experience, and detecting the headlights helps to improve the user's experience during driving.

[0095] The headlight detection circuit 1 and the vehicle control system of this embodiment can simulate various conditions in actual use to meet the needs, accurately measure the current of the headlight in different working modes to evaluate its performance and safety, and provide an automated, integrated and intelligent test system. This embodiment uses a high-precision test chip and develops a host computer software that can adjust the test parameters and perform intelligent analysis based on the test results. In addition, in order to simulate actual use conditions, the headlight current of this embodiment can also be tested under different voltage and temperature conditions, so as to more comprehensively evaluate the performance of the headlight. The headlight detection circuit and the vehicle control system of this embodiment are of great significance for improving the performance of the headlight, ensuring driving safety, and meeting the high standards of the modern automobile industry; at the same time, the headlight detection circuit and the vehicle control system of this embodiment can also test the headlight current under different voltage and temperature conditions, so as to more comprehensively evaluate the performance of the headlight.

[0096] In summary, the utility model provides a headlight detection circuit and a vehicle control system, including: a control module, M headlight test modules, M conduction drive modules, an operational amplifier module and a conversion module; the control module is used to provide a control signal to each headlight test module, and is used to provide a conduction signal to the conduction drive module, and is also used to feedback a signal to determine whether the actual current value of the headlight test module is equal to the preset current value corresponding to the control signal; each headlight test module receives a control signal to provide a corresponding preset current value, thereby turning on the corresponding controlled headlight; each conduction drive module receives a conduction signal to output the actual current value of the corresponding headlight test module; the operational amplifier module and the conversion module sample and amplify the output signal of the conduction drive module to obtain a feedback signal. The utility model is used to accurately measure the headlight current in different working modes to evaluate its performance and safety. Therefore, the utility model effectively overcomes the various shortcomings of the prior art and has a high industrial utilization value.

[0097] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A vehicle light detection circuit, characterized in that: The vehicle lamp detection circuit at least includes: a control module, M vehicle lamp test modules, M conduction drive modules, an operational amplifier module and a conversion module; M is an integer greater than or equal to 1; The control module is used to provide a control signal to each vehicle lamp test module, and to provide a conduction signal to each conduction drive module; the control module is also used to receive a feedback signal output by the conversion module, and to determine whether the actual current value of the vehicle lamp test module is equal to the preset current value corresponding to the control signal based on the magnitude of the feedback signal; Each vehicle lamp test module receives the control signal to provide a corresponding preset current value, thereby turning on the corresponding controlled vehicle lamp; Each conduction driving module is arranged in one-to-one correspondence with each vehicle lamp test module; each conduction driving module receives the conduction signal to output the actual current value of the corresponding vehicle lamp test module to the operational amplifier module; The operational amplifier module is connected to the reference voltage, receives the output signal of each conduction driving module, and samples and amplifies the output signal of the conduction driving module based on the reference voltage; The conversion module receives the output signal of the operational amplifier module to obtain the feedback signal.

2. The vehicle light detection circuit according to claim 1, characterized in that: The vehicle light detection circuit also includes a signal transceiver module; the signal transceiver module is arranged between the control module and each vehicle light test module, and is used to send and receive the control signal to the corresponding vehicle light test module in the form of a message signal.

3. The vehicle light detection circuit according to claim 1, characterized in that: Each vehicle lamp test module includes an LED driver chip and N LED lamps; N is an integer greater than or equal to 1; The control end of each LED lamp is connected to the output end of the LED driver chip The LED driving chip receives the control signal and turns on corresponding LED lamps based on the control signal.

4. The vehicle light detection circuit according to claim 3, characterized in that: The vehicle lamp test module further includes a first power supply unit; the first power supply unit is connected to the LED driving chip to provide a preset current for each LED lamp.

5. The vehicle light detection circuit according to claim 1, characterized in that: Each conduction driving module is configured as a MOS tube; the control end of the MOS tube is connected to the conduction signal, the input end is connected to the corresponding vehicle light test module, and the output end is connected to the operational amplifier module.

6. The vehicle light detection circuit according to claim 1, characterized in that: The operational amplifier module includes an operational amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a first capacitor and a second capacitor; The first end of the first resistor receives the output signal of each conduction driving module, and the second end is grounded; The second resistor and the third resistor are connected in series to form a first series structure; The fourth resistor and the fifth resistor are connected in series to form a second series structure; The first plate of the first capacitor is connected to a node between the second resistor and the third resistor, and the second plate is connected to a node between the fourth resistor and the fifth resistor; The sixth resistor is connected in series with the reference voltage to form a third series structure; The non-inverting input terminal of the operational amplifier is connected to the first end of the first resistor via the first series structure, the inverting input terminal is connected to the second end of the first resistor via the second series structure, and the output terminal is connected to the inverting input terminal of the operational amplifier via the seventh resistor; the non-inverting input terminal of the operational amplifier is also connected to the ground via the third series structure, and the output terminal is also connected to the first plate of the second capacitor via the eighth resistor; The first plate of the second capacitor serves as the output end of the operational amplifier module, and the second plate is connected to the ground.

7. The vehicle light detection circuit according to claim 1, characterized in that: The vehicle light detection circuit is also provided with an acoustic and optical warning module; the acoustic and optical warning module is connected to the control module and is used to send out an acoustic signal and / or an optical signal warning when the actual current value of the vehicle light test module is not equal to the preset current value corresponding to the control signal.

8. The vehicle light detection circuit according to claim 1, characterized in that: The vehicle light detection circuit is also provided with a host computer; The host computer is connected to the control module to regulate various signals of the control module.

9. The vehicle light detection circuit according to claim 1, characterized in that: The control module includes a pulse width modulation unit, which outputs the conduction signal in the form of a square wave pulse wave with a preset bandwidth.

10. A vehicle control system, characterized in that: The vehicle control system comprises the vehicle light detection circuit according to any one of claims 1 to 9.

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