CN109204135B - Dynamic steering lamp system, control method thereof and fault diagnosis method thereof - Google Patents
Dynamic steering lamp system, control method thereof and fault diagnosis method thereof Download PDFInfo
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- CN109204135B CN109204135B CN201710515499.3A CN201710515499A CN109204135B CN 109204135 B CN109204135 B CN 109204135B CN 201710515499 A CN201710515499 A CN 201710515499A CN 109204135 B CN109204135 B CN 109204135B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q11/00—Arrangement of monitoring devices for devices provided for in groups B60Q1/00 - B60Q9/00
- B60Q11/005—Arrangement of monitoring devices for devices provided for in groups B60Q1/00 - B60Q9/00 for lighting devices, e.g. indicating if lamps are burning or not
- B60Q11/007—Arrangement of monitoring devices for devices provided for in groups B60Q1/00 - B60Q9/00 for lighting devices, e.g. indicating if lamps are burning or not the lighting devices indicating change of drive direction
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Abstract
The invention provides a dynamic steering lamp system, a control method thereof and a fault diagnosis method thereof, wherein the dynamic steering lamp system comprises: including automobile body control module and with the dynamic indicator that automobile body control module is connected, the dynamic indicator includes: the LED module comprises an MCU, a compensation circuit and a plurality of LED components; the LED assemblies are connected in parallel, one end of each LED assembly is connected with the output end of the vehicle body control module, the other end of each LED assembly is connected with the MCU, and the other end of each LED assembly is grounded; one end of the compensation circuit is connected with the MCU, and the other end of the compensation circuit is grounded. In the dynamic turn light system, the control method thereof and the fault diagnosis method thereof provided by the invention, the compensation current is provided for the sequentially lighted LEDs, so that the current of the dynamic turn light in the lighting process meets the requirement of a vehicle body control module, thereby solving the problem of matching of the dynamic turn light and the vehicle body control module.
Description
Technical Field
The invention relates to the technical field of automobile fault diagnosis, in particular to a dynamic steering lamp system, a control method thereof and a fault diagnosis method thereof.
Background
The turn signal lamp is an important indicator lamp which is turned on when the motor vehicle turns to prompt the attention of the front, rear, left and right vehicles and pedestrians. The turn signal lamp generally comprises a plurality of LEDs, when the traditional turn signal lamp is turned on, all the LEDs are simultaneously on, and when the traditional turn signal lamp is turned off, all the LEDs are simultaneously off; and the dynamic steering lamp can realize that the LEDs are sequentially lightened one by one. With the improvement of the requirements and the concept of the turn signal lamp of the user, the dynamic turn signal lamp is more and more favored by the user due to the personalized design.
However, many technical problems are encountered in the development of dynamic turn signals, especially matching with the whole vehicle system and fault diagnosis. Since the LEDs in the dynamic turn signal are turned on one by one, the total current of the LEDs is gradually increased during the turning on process, which may cause the vehicle body control module to make a misjudgment when diagnosing the dynamic turn signal.
In order to better match the dynamic turn signal to the body control module, necessary modifications to the dynamic turn signal are needed.
Disclosure of Invention
In view of the above, the present invention provides a dynamic turn signal system, a control method thereof and a fault diagnosis method thereof, so as to solve the problem that the existing dynamic turn signal system is difficult to be matched with a vehicle body control module.
In order to solve the above technical problem, an aspect of the present invention provides a dynamic turn signal system, including a vehicle body control module and a dynamic turn signal connected to the vehicle body control module, where the dynamic turn signal includes: the LED light source comprises a plurality of LED components, an MCU and a compensation circuit;
the LED assemblies are connected in parallel, one end of each LED assembly is connected with the output end of the vehicle body control module, and the other end of each LED assembly is connected with the MCU; the compensation circuit is connected with the MCU.
Optionally, the MCU has an ADC interface and a plurality of I/O interfaces.
Optionally, each LED assembly comprises: LED and with the switch that LED establishes ties, LED with automobile body control module's output is connected, the switch with MCU connects, just the switch bonding.
Optionally, each LED assembly further comprises: the LED, the galvanostat and the switch are sequentially connected in series.
Optionally, each switch is an NPN triode, a base of the NPN triode is connected to the I/O interface, a collector of the NPN triode is connected to the LED, an emitter of the NPN triode is connected to the ADC interface, and the emitter of the NPN triode is bonded.
Optionally, the dynamic steering lamp further comprises a current detection resistor for detecting current in the dynamic steering lamp, the current detection resistor is connected with the MCU, and each LED assembly is connected with the current detection resistor and is grounded through the current detection resistor.
Optionally, the compensation circuit is a variable resistor.
Optionally, the compensation circuit includes a plurality of sub-resistors, the plurality of sub-resistors are connected in parallel, one end of each sub-resistor is connected with the MCU, and the other end of each sub-resistor is grounded.
Optionally, the MCU has an EEROM for storing data.
In order to solve the above problem, another aspect of the present invention provides a method for controlling a dynamic turn signal system, including:
the MCU is used for controlling the LEDs to be sequentially lightened or extinguished, and in the process that the MCU controls the LEDs to be sequentially lightened, the MCU controls the compensation circuit to be connected with the LED assemblies so as to provide compensation current for the LED assemblies.
In order to solve the above problems, the present invention further provides a method for diagnosing a fault of a dynamic turn light system, including the following steps:
the MCU controls the LEDs to be sequentially lightened, and detects the current of the dynamic steering lamp when each LED is lightened;
the MCU judges whether the dynamic steering lamp has a fault or not according to the current change of the dynamic steering lamp, and stores fault information when the dynamic steering lamp has the fault;
when the failure frequency of the dynamic steering lamp reaches a preset value, the MCU closes all the LEDs and the compensation circuit, and the MCU enters a dormant state.
In the dynamic turn light system, the control method thereof and the fault diagnosis method thereof provided by the invention, the compensation current is provided for the sequentially lighted LEDs, so that the current of the dynamic turn light in the lighting process meets the requirement of a vehicle body control module, thereby solving the problem of matching of the dynamic turn light and the vehicle body control module. In addition, sampling current is obtained in real time through the MCU, whether the LED has faults or not is judged, fault information is stored, and the fault information is transmitted when the LED with the faults appears for multiple times, so that the possibility of fault misjudgment is reduced.
Drawings
FIG. 1 is a schematic diagram of a dynamic turn light system in one embodiment of the invention;
FIG. 2 is a graph of the current versus time for a dynamic turn signal system without current compensation in one embodiment of the present invention;
FIG. 3 is a graph of current versus time for a dynamic turn light system with current compensation in an embodiment of the present invention;
FIG. 4 is a flow chart of dynamic turn light system fault diagnosis in an embodiment of the present invention.
In the figure: 10-MCU; 11-EEROM; 20-an LED; 30-a switch; 40-a galvanostat; 50-a compensation circuit; 51-a resistive device; 60-current sense resistance.
Detailed Description
The dynamic turn signal system and the control method thereof and the fault diagnosis method thereof proposed by the present invention are further described in detail below with reference to the accompanying drawings and the specific embodiments. The advantages and features of the present invention will become more fully apparent from the appended claims and the following description. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
Referring to fig. 1, a schematic diagram of a dynamic turn signal system of the present invention is shown, which includes a body control module (BCM, not shown in the figure) and a dynamic turn signal connected to the BCM, wherein the BCM controls a power supply voltage VCC of the dynamic turn signal.
Referring to fig. 1, the dynamic turn signal lamp includes: an MCU10 (Microprogrammed Control Unit), a compensation circuit 50, and a number of LED components. Each LED assembly comprises an LED20, a galvanostat 40, and a switch 30, the LED20, the galvanostat 40, and the switch 30 being connected in series in that order.
The LED modules are connected in parallel, one end of each LED module is connected with the output end of the BCM, the other end of each LED module is connected with the MCU10, and the other end of each LED module is grounded; one end of the compensation circuit 50 is connected to the MCU10, and the other end of the compensation circuit 50 is grounded.
The control method of the dynamic steering lamp system comprises the following steps: when the BCM starts the dynamic steering lamp, the MCU10 controls the LEDs 20 to be sequentially turned on or turned off, and in the process that the MCU10 controls the LEDs 20 to be sequentially turned on, the MCU10 controls the compensation circuit 50 to be connected with the LED assemblies in parallel so as to provide compensation current for the LED assemblies, so that the total current of the dynamic steering lamp in the turning-on process can meet the detection requirement of the BCM. That is, the MCU10 passes current through the compensation circuit 50 and increases the current in the compensation circuit 50 to the current in the illuminated LED as the diagnostic current for the BCM, which apparently functions as a result of the parallel connection of the compensation circuit 50 to the LED assembly, which is controlled by the MCU 10.
As will be described in more detail below with reference to a more specific embodiment, assuming that the operating current of one LED is 30mA, the detection requirement of the BCM is that the normal operating current of the dynamic steering lamp is greater than or equal to 65mA, and the fault state diagnosis current is less than 10mA, when the current of the dynamic steering lamp is between 10mA and 65mA, the dynamic steering lamp is in an uncertain state, because the current of one or two LEDs is less than 65mA (30mA and 60mA respectively) in the initial stage of the sequential lighting of the LEDs 20 in the dynamic steering lamp, which may cause the erroneous judgment of the BCM. And after the compensation circuit 50 is designed, in the initial stage of sequentially lighting the LEDs in the dynamic steering lamp, the working current (30mA) of one LED20 plus the compensation current (for example, 35mA or more than 35mA) provided by the compensation circuit 50 is more than or equal to 65mA, so that the detection requirement of the BCM is met, and when the number of the lighted LEDs 20 is gradually increased to the value that the current of the lighted LEDs itself meets the detection requirement (65mA) of the BCM, the MCU10 closes the compensation circuit 50.
The current change of the dynamic turn signal lamp without current compensation is shown in fig. 2; after the current compensation, the current change of the dynamic steering lamp is as shown in fig. 3, and it can be known from fig. 2 and 3 that the minimum current of the dynamic steering lamp is greater than or equal to 65mA through the current compensation, and the detection requirement of the BCM is met.
To put it more concretely, the MCU10 has an EEROM (Electrically Erasable Read-Only Memory) for storing data, the MCU10 further has a plurality of I/O interfaces for connecting the plurality of parallel LEDs 20 and the compensation circuit 50, and an ADC interface for connecting the plurality of parallel LEDs.
In the above scheme, each switch 30 may be an NPN transistor, a base of the NPN transistor is connected to the I/O interface, a collector of the NPN transistor is connected to the corresponding LED20, an emitter of the NPN transistor is connected to the ADC interface, and the emitter of the NPN transistor is bonded.
In order to facilitate the detection of the current of the dynamic steering lamp, the dynamic steering lamp further includes a current detection resistor 60, the current detection resistor 60 is connected to the ADC interface of the MCU10 and is connected in series with all the LEDs, and the current detection resistor 60 is used to detect the total current in the dynamic steering lamp.
As can be seen from fig. 1, an LED, a galvanostat 40, and a triode (collector) are sequentially connected in series, a base and an emitter of the triode are respectively connected to an input/output (i.e., input/output) port and an ADC port, and the emitter is grounded to a vehicle body through a current detection resistor 60. Therefore, the MCU10 can control the on/off of each LED20 through the switch 30, and can also obtain the current value of the current detection resistor 60 (i.e. the total current of the dynamic turn signal), and detect whether the dynamic turn signal has a fault or not through the change of the current value.
Assuming that the working current of one LED is 30mA, the detection requirement of BCM is that the normal working current of the dynamic steering lamp is more than or equal to 65mA, the fault state diagnosis current is less than 10mA, and the current detection resistance can be calculated according to the following formula:
wherein, I (LED) is single-string LED current, n is total string number of LED, and R represents current detection resistance.
Specifically, the compensation circuit 50 may be composed of a plurality of resistor devices 51 (which may be fixed resistors) with equal resistance values, or may be a variable resistor, so as to compensate current values with different magnitudes at different time intervals. When the compensation circuit 50 is composed of a plurality of resistor devices 51 with equal resistance values, when the first LED20 is turned on, all the compensation circuits 50 operate simultaneously to provide a maximum current so that the total current of the dynamic steering lamp meets the BCM requirement, and when the second LED20 is turned on, the current provided by the LED20 is increased so that the current to be compensated is decreased, and the decrease may be performed by turning off some of the resistor devices 51 so that the compensation current is decreased. When the number of lit LEDs 20 is as high as the BCM detection requirement, the compensation circuit 50 is completely disabled.
Assuming that the working current of one LED is 30mA, the detection requirement of BCM is that the normal working current of the dynamic steering lamp is greater than or equal to 65mA, and the fault state diagnosis current is less than 10mA, the resistance value of each resistor 51 can be calculated according to the following formula:
wherein, i (LED) is the current value of a single string of LEDs, n is the number of the compensation steps, i.e. the number of the resistor devices 51, and R1 to Rn are the resistance values of each resistor device 51.
When the compensation circuit 50 is a variable resistor, the resistance of the variable resistor gradually increases during the sequential lighting of the dynamic turn signal lamps, and the compensation current provided by the variable resistor gradually decreases.
The control method fault diagnosis method is described below by combining a dynamic turn light system, and specifically comprises the following steps:
the MCU controls the LEDs connected in parallel to be sequentially lightened, and detects the current change of the dynamic steering lamp when each LED is lightened;
the MCU judges whether the dynamic steering lamp has a fault or not according to the current change of the dynamic steering lamp, and stores fault information when the dynamic steering lamp has the fault;
when the failure frequency of the dynamic steering lamp reaches a preset value, the MCU closes all the LEDs and the compensation circuit, and the MCU enters a dormant state.
Referring to fig. 4, a procedure of a fault diagnosis procedure for a dynamic turn signal system is specifically described, where an MCU obtains fault information and stores fault times, when the fault times are smaller than a set value, a compensation circuit operates to provide a compensation current for the dynamic turn signal system, and then lights a first string of LEDs, where each string of LEDs includes at least one LED. After a first LED is lighted, current sampling is carried out by the current detection resistor, the sampled current is transmitted to the MCU, then a second LED is lighted, meanwhile, the MCU controls the compensation circuit to reduce the compensation current, the current detection resistor continues to carry out current sampling, the sampled current is transmitted to the MCU, all LEDs are lighted till the MCU judges whether fault LEDs exist according to the change of the sampled current, if the fault LEDs exist, the fault times are stored, when the fault times are larger than or equal to a set value, the MCU controls the compensation circuit and all LEDs to be turned off, the MCU enters a dormant state, the current in the dynamic steering lamp enters the fault state, and fault information is transmitted through the vehicle body control module.
In the dynamic turn light system, the control method thereof and the fault diagnosis method thereof provided by the invention, the compensation current is provided for the sequentially lighted LEDs, so that the current of the dynamic turn light in the lighting process meets the requirement of a vehicle body control module, thereby solving the problem of matching of the dynamic turn light and the vehicle body control module. In addition, sampling current is obtained in real time through the MCU, whether the LED has faults or not is judged, fault information is stored, and the fault information is transmitted when the LED with the faults appears for multiple times, so that the possibility of fault misjudgment is reduced.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.
Claims (9)
1. A dynamic turn light system is characterized by comprising a vehicle body control module and a dynamic turn light connected with the vehicle body control module, wherein the dynamic turn light comprises: the LED light source comprises a plurality of LED components, an MCU and a compensation circuit;
the LED assemblies are connected in parallel, one end of each LED assembly is connected with the output end of the vehicle body control module, and the other end of each LED assembly is connected with the MCU; the compensation circuit with the MCU is connected, and every LED subassembly all includes: the LED is connected with the output end of the vehicle body control module, the switch is connected with the MCU, and the switch is grounded;
the MCU is provided with an EEROM, and the EEROM is used for storing the failure times when each LED component fails; the MCU judges whether all the LED components and the compensation circuit continue to work or not according to the fault times stored in the EEROM;
when the failure times are smaller than a set value, the compensation circuit works;
when the failure times are larger than or equal to the set value, the MCU controls the compensation circuit to be switched off。
2. The dynamic turn light system of claim 1, wherein the MCU has an ADC interface and a number of I/O interfaces.
3. The dynamic turn light system of claim 2, wherein each LED assembly further comprises: the LED, the galvanostat and the switch are sequentially connected in series.
4. The dynamic turn light system of claim 2, wherein each switch is an NPN transistor, a base of the NPN transistor is connected to the I/O interface, a collector of the NPN transistor is connected to the LED, an emitter of the NPN transistor is connected to the ADC interface, and an emitter of the NPN transistor is bonded.
5. The dynamic turn light system of claim 1, further comprising a current sense resistor for sensing current in the dynamic turn light, the current sense resistor being connected to the MCU, and each LED assembly being connected to the current sense resistor and being grounded via the current sense resistor.
6. The dynamic turn light system of claim 1, wherein the compensation circuit is a variable resistor.
7. The dynamic turn light system of claim 1, wherein the compensation circuit comprises a plurality of sub-resistors connected in parallel, one end of each sub-resistor being connected to the MCU, the other end of the sub-resistor being grounded.
8. A method for controlling a dynamic turn signal system as claimed in any one of claims 1 to 7, comprising:
the MCU is used for controlling the LEDs to be sequentially lightened or extinguished, and in the process that the MCU controls the LEDs to be sequentially lightened, the MCU controls the compensation circuit to be connected with the LED assemblies so as to provide compensation current for the LED assemblies.
9. The method for fault diagnosis of a dynamic turn light system as claimed in any one of claims 1 to 7, comprising the steps of:
the MCU controls the LEDs to be sequentially lightened, and detects the current of the dynamic steering lamp when each LED is lightened;
the MCU judges whether the dynamic steering lamp has a fault or not according to the current change of the dynamic steering lamp, and stores fault information when the dynamic steering lamp has the fault;
when the failure frequency of the dynamic steering lamp reaches a preset value, the MCU closes all the LEDs and the compensation circuit, and the MCU enters a dormant state.
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| CN201710515499.3A CN109204135B (en) | 2017-06-29 | 2017-06-29 | Dynamic steering lamp system, control method thereof and fault diagnosis method thereof |
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| CN201710515499.3A CN109204135B (en) | 2017-06-29 | 2017-06-29 | Dynamic steering lamp system, control method thereof and fault diagnosis method thereof |
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| CN109204135B true CN109204135B (en) | 2021-05-25 |
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| CN110536505B (en) * | 2019-07-26 | 2020-12-22 | 江苏力行电力电子科技有限公司 | System fault self-diagnosis device for remote LED landscape brightening |
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| KR101934751B1 (en) * | 2012-10-31 | 2019-01-03 | 현대모비스 주식회사 | Lighting System for Vehicle and Control Method Thereof |
| KR20140071114A (en) * | 2012-12-03 | 2014-06-11 | 현대모비스 주식회사 | Method and device of providing curve information judging vehicle expected path |
| CN103116139B (en) * | 2013-01-23 | 2016-03-23 | 重庆恒又源科技发展有限公司 | Street lamp fault detection method, pick-up unit and detection system thereof |
| CN104457976A (en) * | 2013-09-20 | 2015-03-25 | 西安众智惠泽光电科技有限公司 | Illumination fault detection and maintenance monitoring system for advertising lamp boxes |
| CN205378296U (en) * | 2016-02-18 | 2016-07-06 | 常州星宇车灯股份有限公司 | A increase a class module for dynamic indicator |
| CN205657874U (en) * | 2016-04-11 | 2016-10-19 | 常州星宇车灯股份有限公司 | Novel automobile -used indicator system |
| CN106853792B (en) * | 2016-12-30 | 2023-06-16 | 华域视觉科技(上海)有限公司 | Method for controlling automobile steering lamp to generate time sequence lighting effect |
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