A method and system for detecting turn signal underload based on vehicle body domain control

Abstract

The present invention discloses a method and system for detecting underload of turn signals based on vehicle body domain control, the method comprising: collecting the working voltage of the current vehicle body domain controller, judging whether the voltage is the rated working voltage, if so, using the calibrated underload threshold to judge the current AD value fed back by the turn signal to judge whether there is an underload fault; if not, adjusting the calibrated underload threshold based on the working voltage of the current vehicle body domain controller to obtain the actual underload threshold, judging the current AD value fed back by the turn signal based on the actual underload threshold to judge whether there is an underload fault. The advantages of the present invention are: by dynamically correcting the undervoltage threshold, the underload fault of the turn signal can be detected more accurately, making the diagnosis of software system faults simpler, more convenient and more accurate, and by compensating the underload threshold of the turn signal through voltage fluctuation, the underload fault of the turn signal can be detected more accurately, ensuring the safety and reliability of the vehicle body controller.

Description

Technical Field

[0001] The present invention relates to the field of automotive electronics, and in particular to a method and system for detecting underload of a turn signal lamp based on vehicle body domain control. Background Art

[0002] Automobile turn signals are lights that warn the vehicle or pedestrians or vehicles behind it when the vehicle turns. They can be divided into halogen lights and LED lights by type; and can be divided into front turn signals, rear turn signals, and side turn signals by location.

[0003] Turn signals belong to the control of external lights of the vehicle body. During normal driving of the vehicle, the body controller must control the turn signals to flash normally according to the switch. Usually, turn signals are divided into two groups, left and right. Each group of turn signals has front turn signals, side turn signals, and rear turn signals connected in parallel. When one of the turn signals fails, the body controller must accurately detect it, perform double-frequency double flashes, and record DTC.

[0004] Turn signals are divided into halogen lamps and LED lamps. Since turn signals have their own diagnostic feedback lines, they are designed for halogen lamps. When multiple halogen lamps are connected in parallel and some of them fail, the body controller may not be working at the rated voltage. The feedback current of the turn signal will change with the working voltage. If the underload threshold of the turn signal remains unchanged, it is very easy to mistakenly detect an open circuit, thus causing the turn signal to malfunction. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and to provide a method and system for detecting turn signal underload based on body domain control. For halogen lamps, the turn signal underload threshold is compensated by voltage fluctuations, which can more accurately detect the turn signal underload fault and ensure the safety and reliability of the body controller.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is: a method for detecting underload of a turn signal lamp based on vehicle body domain control, the method comprising:

[0007] Collect the current working voltage of the vehicle body domain controller to determine whether the voltage is the rated working voltage. If so, use the calibrated underload threshold to judge the current AD value fed back by the turn signal to determine whether it is an underload fault;

[0008] If not, the calibrated underload threshold is adjusted based on the current working voltage of the vehicle body domain controller to obtain the actual underload threshold, and the current AD value fed back by the turn signal is judged based on the actual underload threshold to determine whether there is an underload fault.

[0009] The corresponding threshold offset is calculated based on the current working voltage of the vehicle body domain controller, and the actual underload threshold is calculated according to the following formula:

[0010] Actual underload threshold = calibrated underload threshold + threshold offset.

[0011] A function formula for setting a turn signal threshold offset and voltage is pre-calibrated, and a corresponding threshold offset is calculated based on the function formula.

[0012] The calibration methods of the function formula include:

[0013] The AD value of the turn signal feedback current of the vehicle body domain controller under different working voltages is obtained through experiments, and the comparison relationship between the working voltage and the AD value of the feedback current is obtained;

[0014] The AD value of the turn signal feedback current is processed to obtain the threshold offset under the working voltage, and the threshold offset data under different working voltages are obtained. Based on the comparison relationship between the working voltage and the threshold offset, a mathematical fitting method is used to obtain the function formula of the turn signal threshold offset and voltage.

[0015] Processing the AD value of the turn signal feedback current includes: experimentally verifying the current AD value obtained under different working voltage conditions to obtain its critical value under the underload state, using the critical value as the corresponding underload threshold, comparing the undervoltage threshold and the underload threshold under rated operation to obtain the offset of the underload threshold, thereby achieving a one-to-one correspondence between the working voltage and the offset of the underload threshold.

[0016] After obtaining the control relationship between the operating voltage and the threshold offset, the least squares method is used to fit the functional relationship.

[0017] Based on the functional relationship, different voltages are introduced to obtain the corresponding threshold offset table. When making an underload judgment, the threshold offset is obtained by looking up the table or the current working voltage is directly introduced into the function formula to calculate the threshold offset.

[0018] The function formula or the threshold offset comparison table is configured in the vehicle-mounted domain controller. When underload is judged, the vehicle-mounted domain controller is used to judge whether the vehicle is underloaded.

[0019] A system for detecting underload of a turn signal lamp based on vehicle body domain control, the system comprising an on-vehicle domain controller, and the on-vehicle domain controller is configured to run the method described.

[0020] The advantages of the present invention are: by dynamically correcting the undervoltage threshold, the underload fault of the turn signal can be detected more accurately, making the diagnosis of the software system fault simpler, more convenient and more accurate; by compensating the underload threshold of the turn signal through voltage fluctuation, the underload fault of the turn signal can be detected more accurately, thereby ensuring the safety and reliability of the vehicle body controller. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The following is a brief description of the contents expressed in the drawings of the present invention and the symbols in the drawings:

[0022] Figure 1 It is a principle diagram of the fitting function formula in the method of the present invention. DETAILED DESCRIPTION

[0023] The specific implementation of the present invention will be further explained in detail below by describing the optimal embodiment with reference to the accompanying drawings.

[0024] An algorithm scheme for detecting turn signal underload based on vehicle body domain control is designed to more accurately detect turn signal underload faults, thereby making the diagnosis of software system faults simpler, more convenient and more accurate.

[0025] The present invention provides a design of an algorithm for detecting underload of a turn signal based on a vehicle body domain control, comprising: S1, obtaining AD values ​​of feedback current of the turn signal under different voltages of the vehicle body domain control, and establishing a threshold-voltage mathematical model of the turn signal; S2, based on the threshold-voltage mathematical model of the turn signal, using the least squares method to fit a turn signal threshold offset-voltage function formula and a curve; S3, based on the threshold offset-voltage function formula of the turn signal, bringing in different voltages to obtain a corresponding threshold offset table; S4, based on the threshold offset table, looking up a table to obtain a corresponding offset during a turn signal diagnosis process, correcting the underload threshold of the turn signal in real time, and detecting whether the turn signal is underloaded.

[0026] Specifically, a method for detecting underload of a turn signal lamp based on a vehicle body domain controller in this embodiment includes: collecting the current working voltage of the vehicle body domain controller, judging whether the voltage is the rated working voltage, and if so, judging the current AD value fed back by the turn signal lamp by using a calibrated underload threshold value to judge whether there is an underload fault;

[0027] If not, the calibrated underload threshold is adjusted based on the current working voltage of the vehicle body domain controller to obtain the actual underload threshold, and the current AD value fed back by the turn signal is judged based on the actual underload threshold to determine whether there is an underload fault.

[0028] Since different working voltages will affect the judgment of underload, this solution determines whether to use the calibrated underload threshold calibrated under the rated state to make underload judgment based on whether the working voltage of the on-board domain controller is at the rated working point voltage. When it is not at the working voltage, the calibrated underload threshold is judged. By dynamically adjusting the underload threshold in this way, the underload judgment can be made more accurately and reliably, avoiding errors in underload judgment caused by changes in the working voltage.

[0029] The adjustment of the calibration underload threshold is implemented as follows:

[0030] The corresponding threshold offset is calculated based on the current working voltage of the vehicle body domain controller, and the actual underload threshold is calculated according to the following formula: actual underload threshold = calibrated underload threshold + threshold offset.

[0031] The function formula of the turn signal threshold offset and voltage is pre-calibrated, and the corresponding threshold offset is calculated based on the function formula. The function formula calibration method includes:

[0032] The AD value of the turn signal feedback current of the vehicle body domain controller under different working voltages is obtained through experiments, and the comparison relationship between the working voltage and the AD value of the feedback current is obtained;

[0033] The AD value of the turn signal feedback current is processed to obtain the threshold offset under the working voltage, and the threshold offset data under different working voltages are obtained. Based on the comparison relationship between the working voltage and the threshold offset, a mathematical fitting method is used to obtain the function formula of the turn signal threshold offset and voltage.

[0034] Processing the AD value of the turn signal feedback current includes: experimentally verifying the current AD value obtained under different working voltage conditions to obtain its critical value under the underload state, using the critical value as the corresponding underload threshold, comparing the undervoltage threshold and the underload threshold under rated operation to obtain the offset of the underload threshold, thereby achieving a one-to-one correspondence between the working voltage and the offset of the underload threshold.

[0035] In this embodiment, after obtaining the control relationship between the operating voltage and the threshold offset, the least square method is used to fit the functional relationship.

[0036] Based on the functional relationship, different voltages are introduced to obtain the corresponding threshold offset table. When making an underload judgment, the threshold offset is obtained by looking up the table or the current working voltage is directly introduced into the function formula to calculate the threshold offset.

[0037] The function formula or the threshold offset comparison table is configured in the vehicle-mounted domain controller. When underload is judged, the vehicle-mounted domain controller is used to judge whether the vehicle is underloaded.

[0038] The present solution also provides a system for detecting underload of a turn signal based on vehicle body domain control. The system includes an on-board domain controller, and the on-board domain controller is configured to run the underload determination method in the above embodiment.

[0039] The following is an example of calibration:

[0040] An algorithm solution for detecting turn signal underload based on vehicle body domain control includes:

[0041] S1, obtain the AD value of the turn signal feedback current under different voltages of the vehicle body domain control, and establish a mathematical model of the turn signal threshold-voltage;

[0042] S2, based on the turn signal threshold-voltage mathematical model, using the least squares method to fit the turn signal threshold offset-voltage function formula and curve;

[0043] S3, based on the turn signal threshold offset-voltage function formula, different voltages are substituted to obtain a corresponding threshold offset table;

[0044] S4, based on the threshold offset table, in the process of turn signal diagnosis, the table is looked up to obtain the corresponding offset, the turn signal underload threshold is corrected in real time, and whether the turn signal is underloaded is detected.

[0045] Step S1 can be understood as controlling the turn signal feedback current AD value under different voltages through the vehicle body domain, which is summarized in the following Table 1:

[0046]

[0047] Table 1 Turn signal feedback current AD value

[0048] That is, after normalizing the AD value of the turn signal feedback current, the turn signal threshold-voltage mathematical model can be obtained, as shown in Table 2 below:

[0049]

[0050] Table 2 Turn signal threshold-voltage mathematical model

[0051] Step S2, based on the turn signal threshold-voltage mathematical model, the least squares method is used to fit the turn signal threshold offset-voltage function formula and curve, such as Figure 1 .

[0052] Fitting formula:

[0053] y=-2.541x+33.937

[0054] Based on the turn signal threshold offset-voltage function formula, different voltages are substituted to obtain a corresponding threshold offset table;

[0055]

[0056]

[0057]

[0058] Table 3 Threshold offset table

[0059] Step S4: During the turn signal diagnosis process, the current body controller voltage is obtained, the underload threshold is compensated in real time, and the actual underload threshold is obtained:

[0060] Actual underload threshold = calibrated underload threshold + threshold offset

[0061] Check whether the turn signal lamp is underloaded:

[0062] Turn signal feedback current AD value < actual underload threshold.

[0063] When the above formula is satisfied, the turn signal underload fault can be determined and the corresponding software strategy can be executed.

[0064] Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, they are all within the protection scope of the present invention.

Claims

1. A method for detecting underload of a turn signal lamp based on vehicle body domain control, characterized in that: The method comprises: Collect the current working voltage of the vehicle body domain controller to determine whether the voltage is the rated working voltage. If so, use the calibrated underload threshold to judge the current AD value fed back by the turn signal to determine whether it is an underload fault; If not, the calibrated underload threshold is adjusted based on the current working voltage of the vehicle body domain controller to obtain the actual underload threshold, and the current AD value fed back by the turn signal is judged based on the actual underload threshold to determine whether there is an underload fault.

2. The method for detecting underload of a turn signal lamp based on vehicle body domain control as claimed in claim 1, characterized in that: The corresponding threshold offset is calculated based on the current working voltage of the vehicle body domain controller, and the actual underload threshold is calculated according to the following formula: Actual underload threshold = calibrated underload threshold + threshold offset.

3. The method for detecting underload of a turn signal lamp based on vehicle body domain control as claimed in claim 2, characterized in that: A function formula for setting a turn signal threshold offset and voltage is pre-calibrated, and a corresponding threshold offset is calculated based on the function formula.

4. The method for detecting underload of a turn signal lamp based on vehicle body domain control as claimed in claim 3, characterized in that: The calibration methods of the function formula include: The AD value of the turn signal feedback current of the vehicle body domain controller under different working voltages is obtained through experiments, and the comparison relationship between the working voltage and the AD value of the feedback current is obtained; The AD value of the turn signal feedback current is processed to obtain the threshold offset under the working voltage, and the threshold offset data under different working voltages are obtained. Based on the comparison relationship between the working voltage and the threshold offset, a mathematical fitting method is used to obtain the function formula of the turn signal threshold offset and voltage.

5. The method for detecting underload of a turn signal lamp based on vehicle body domain control as claimed in claim 4, characterized in that: Processing the AD value of the turn signal feedback current includes: experimentally verifying the current AD value obtained under different working voltage conditions to obtain its critical value under the underload state, using the critical value as the corresponding underload threshold, comparing the undervoltage threshold and the underload threshold under rated operation to obtain the offset of the underload threshold, thereby achieving a one-to-one correspondence between the working voltage and the offset of the underload threshold.

6. The method for detecting underload of a turn signal lamp based on vehicle body domain control as claimed in claim 5, characterized in that: After obtaining the control relationship between the operating voltage and the threshold offset, the least squares method is used to fit the functional relationship.

7. A method for detecting underload of a turn signal lamp based on vehicle body domain control as described in any one of claims 1 to 5, characterized in that: Based on the functional relationship, different voltages are introduced to obtain the corresponding threshold offset table. When making an underload judgment, the threshold offset is obtained by looking up the table or the current working voltage is directly introduced into the function formula to calculate the threshold offset.

8. The method for detecting underload of a turn signal lamp based on vehicle body domain control as claimed in claim 7, characterized in that: The function formula or the threshold offset comparison table is configured in the vehicle domain controller. When underload is judged, the vehicle domain controller is used to judge whether the vehicle is underloaded.

9. A system for detecting underload of turn signal lamp based on vehicle body domain control, characterized in that: The system comprises an on-vehicle domain controller, and the on-vehicle domain controller is configured to run the method according to any one of claims 1-8.

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