CN110191537A - Vehicle lamp over-temperature protection system, vehicle having the same, and vehicle lamp over-temperature protection method - Google Patents

Abstract

The present invention provides a kind of car light overheat protector system, the vehicle with it and car light excess temperature protection method; car light overheat protector system includes: multiple PTC temperature detecting modules; multiple PTC temperature detecting modules are connected respectively with multiple Grille lamps to detect the temperature of corresponding Grille lamp respectively, and obtain temperature signal；MCU chip, MCU chip can be used in judging whether temperature signal is more than threshold value, if being more than, send feedback signal；Host computer, host computer can receive feedback signal and notify vehicle driver；LED drive chip, LED drive chip are respectively connected with MCU chip and multiple Grille lamps, and LED drive chip can receive feedback signal and adjust the electric current of multiple Grille lamps；Power module, power module can power to MCU chip and LED drive chip.Car light overheat protector system according to an embodiment of the present invention can adjust the temperature of Grille lamp in time, and car light is avoided to break down because temperature is excessively high, guarantee the safety of vehicle drive.

Description

Vehicle lamp over-temperature protection system, vehicle having the same, and vehicle lamp over-temperature protection method

technical field

The invention relates to the field of vehicles, in particular to a vehicle lamp overtemperature protection system, a vehicle having the same and a vehicle lamp overtemperature protection method.

Background technique

Compared with traditional light sources, LED light sources are solid cold light sources, which have the characteristics of long life, high luminous efficiency, no radiation, low power consumption, good shock and earthquake resistance, and high reliability. Therefore, more and more car headlights have used LED light sources as car lights to replace traditional halogen lamps or xenon lamps. Since the higher the power of the LED light source, the higher the junction temperature generated by the LED light source, therefore, it is necessary to monitor the temperature and over-temperature protection of the LED headlights for driving safety.

As far as the grille lamp is concerned, multiple lamp groups are installed at the grille of the vehicle air intake, close to the engine radiator, and are strongly affected by temperature. In addition to the influence of the junction temperature of the LED light source itself, the grille lamp is easily affected by temperature. If it is too high, it will cause a malfunction, which will affect the safety of driving the vehicle.

Contents of the invention

In view of this, the present invention provides a vehicle lamp over-temperature protection system, which can prevent the vehicle lamp from malfunctioning due to overheating and ensure the safety of vehicle driving.

The present invention also provides a vehicle with the above-mentioned vehicle lamp over-temperature protection system.

The invention also provides an over-temperature protection method for the vehicle lamp.

According to the embodiment of the first aspect of the present invention, the vehicle lamp over-temperature protection system can be used to protect the grille lamp of the vehicle. The grille lamp is composed of a plurality of LED lamps. The vehicle lamp over-temperature protection system includes: a plurality of A PTC temperature detection module, a plurality of PTC temperature detection modules are respectively connected to a plurality of the grille lights to respectively detect the temperature of the corresponding grille lights, and obtain a temperature signal; an MCU chip, the MCU chip is connected to the plurality of grille lights The two PTC temperature detection modules are respectively connected, and the MCU chip can be used to judge whether the temperature signal exceeds a threshold, and if it exceeds, a feedback signal is sent; the upper computer, the upper computer is connected with the MCU chip, and the upper computer is connected to the MCU chip. The upper computer can receive the feedback signal and notify the vehicle driver; the LED driver chip is connected to the MCU chip and a plurality of grill lights respectively, and the LED driver chip can receive the feedback signal And adjust the current of a plurality of said grid lamps; a power module, said power module is connected with said MCU chip and said LED driver chip respectively, said power module can supply power to said MCU chip and said LED driver chip .

According to the car lamp over-temperature protection system of the embodiment of the present invention, the temperature of the grille lamp is detected by the PTC temperature signal detection module, and the control signal of the MCU chip is received by the LED driver chip to realize the brightness adjustment and temperature adjustment of the grille lamp. The lamp over-temperature protection system can prevent the lamp from malfunctioning due to overheating and ensure the safety of driving.

The vehicle lamp over-temperature protection system according to the embodiment of the present invention may also have the following additional technical features.

According to an embodiment of the present invention, the vehicle lamp over-temperature protection system further includes: a bus transceiver, the bus transceiver is connected to the MCU chip, and the MCU chip communicates with the host computer through the bus transceiver The feedback signal is fed back.

According to an embodiment of the present invention, the bus transceiver is a CAN transceiver, and the CAN transceiver is connected to the MCU chip through a signal line.

According to an embodiment of the present invention, the power supply module includes: a constant current source module, the constant current source module is connected to the LED driver chip to supply power to the LED driver chip; an LDO power supply module, the LDO power supply module It is connected with the MCU chip and the bus transceiver to supply power to the MCU chip and the bus transceiver.

According to an embodiment of the present invention, the MCU chip further includes: a timer, the timer is started when the temperature signal is greater than a threshold, and the duration of the grille lamp under the temperature signal exceeds a predetermined time, Then the MCU chip controls the LED driver chip to adjust the current of the grille lamp and sends the feedback signal to the host computer through the bus transceiver.

According to an embodiment of the present invention, the LED driver chip is connected to the MCU chip through an SPI bus.

According to an embodiment of the present invention, the PTC temperature detection module is a PTC thermistor.

According to an embodiment of the present invention, the feedback signal includes an alarm signal, and the host computer can display the temperature signal and the alarm signal on a vehicle dashboard or a central control display screen.

According to an embodiment of the present invention, the feedback signal further includes a control signal, and the LED driver chip can receive the control signal and adjust the currents of the plurality of grill lights according to the control signal.

The vehicle according to the embodiment of the second aspect of the present invention includes the vehicle lamp over-temperature protection system described in the above embodiment.

According to the third aspect of the present invention, the over-temperature protection method for vehicle lights includes the following steps: S1, detecting the temperature of the grille lamp, and obtaining a temperature signal; S2, judging whether the temperature signal is lower than a preset threshold, and when the When the temperature signal exceeds the threshold, a feedback signal is generated; S3, start a timer, adjust the current of the grille lamp and send the feedback signal; S4, repeat steps S2 and S3 to the temperature of the grille lamp If the signal is lower than the threshold value, control the driving current of the grille lamp to recover, and release the feedback signal.

According to an embodiment of the present invention, the vehicle lamp over-temperature protection method further includes: S5. Within a preset time, when the driving current of the grille lamp is weakened and the temperature signal is higher than a threshold, control the The operating current of the grille lamp is turned off, and the feedback signal is sent.

Description of drawings

Fig. 1 is a schematic diagram of a grille lamp and a PTC temperature detection module installed on a vehicle according to an embodiment of the present invention;

Fig. 2 is a schematic structural diagram of an over-temperature protection system for vehicle lamps according to an embodiment of the present invention.

Reference signs:

Lamp over-temperature protection system 100; PTC temperature detection module 10; MCU chip 20; host computer 30; LED driver chip 40; power supply module 50; constant current source module 51; LDO power supply module 52; 70.

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial", The orientation or positional relationship indicated by "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the referred device or element Must be in a particular orientation, be constructed in a particular orientation, and operate in a particular orientation, and therefore should not be construed as limiting the invention. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

The vehicle lamp over-temperature protection system 100 according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in Fig. 1 and Fig. 2, the car lamp over-temperature protection system 100 according to the embodiment of the present invention can be used to protect the grille lamp 70 of the vehicle. The system 100 includes a plurality of PTC temperature detection modules 10 , an MCU chip 20 , a host computer 30 , an LED driver chip 40 and a power supply module 50 .

Specifically, a plurality of PTC temperature detection modules 10 are respectively connected with a plurality of grille lights 70 to respectively detect the temperature of the corresponding grille lights 70, and obtain temperature signals, and the MCU chip 20 is connected with a plurality of PTC temperature detection modules 10 respectively , the MCU chip 20 can be used to judge whether the temperature signal exceeds the threshold value, if it exceeds, then send a feedback signal, the upper computer 30 is connected with the MCU chip 20, the upper computer 30 can receive the feedback signal and notify the vehicle driver, the LED driver chip 40 and the MCU The chip 20 is connected to a plurality of grille lights 70 respectively, the LED driver chip 40 can receive feedback signals and adjust the current of the plurality of grille lights 70, the power module 50 is connected to the MCU chip 20 and the LED driver chip 40 respectively, and the power module 50 can Provide power to the MCU chip 20 and the LED driver chip 40 .

In other words, the car lamp over-temperature protection system 100 is mainly composed of multiple PTC temperature detection modules 10, MCU chips 20, host computer 30, LED driver chips 40 and power supply modules 50, wherein the grille lights 70 are composed of LED lights, and each group Grille lamps 70 correspond to one PTC temperature detection module 10, and the temperature of multiple grille lamps 70 is monitored through multiple PTC temperature detection modules 10. When an over-temperature fault occurs, the faulty grille can be located more quickly lamp 70, and at the same time, the signal output terminal of the PTC temperature detection module 10 is connected to the pin of the MCU chip 20, and the MCU chip 20 judges whether the temperature signal exceeds the threshold value, and when the temperature signal exceeds the threshold value, it is fed back to the vehicle driver in time through the host computer 30 In order to facilitate the driver to understand the temperature status of the headlights. The LED driver chip 40 is connected with the MCU chip 20, the LED driver chip 40 is used to receive the feedback signal sent by the MCU chip 20, and adjusts the PEM wave to realize the adjustment of the brightness and temperature of the grille lamp 70, and the power module 50 is used to provide power to the MCU. The chip 20 and the LED driver chip 40 provide power. In order to ensure the consistency of light emission of the grille lights 70, even if only one group of grille lights 70 has an LED over-temperature fault, the LED circuits of all the grille lights 70 will be adjusted.

Therefore, according to the vehicle lamp over-temperature protection system 100 of the embodiment of the present invention, the temperature of the grille lamp 70 is detected by the PTC temperature signal detection module, and the control signal of the MCU chip 20 is received by the LED driver chip 40 to realize the grille lamp 70. Brightness adjustment and temperature adjustment, the car lamp over-temperature protection system 100 can prevent the car lamp from malfunctioning due to overheating, and ensure the safety of vehicle driving.

According to an embodiment of the present invention, the vehicle lamp over-temperature protection system 100 further includes a bus transceiver 60 connected to the MCU chip 20 , and the MCU chip 20 feeds feedback signals to the host computer 30 through the bus transceiver 60 .

Specifically, the vehicle lamp over-temperature protection system 100 can monitor the over-temperature condition of the grille lamp 70 in real time, control the temperature of the grille lamp 70 by adjusting the current of the grille lamp 70, and communicate to the host computer 30 through the bus transceiver 60 in real time. Feedback of the temperature state of the grille lamp 70 enables the driver to know the temperature state of the grille lamp 70 in real time, thereby avoiding failures and accidents caused by overheating.

Preferably, the bus transceiver 60 is a CAN transceiver, and the CAN transceiver is connected to the MCU chip 20 through a signal line for real-time feedback of LED temperature conditions and over-temperature alarm signals to the host computer 30 .

In other words, through the AD sampling of the MCU chip 20, the temperature value of each group of grille lights 70 can be obtained in real time, and fed back to the host computer 30 through the CAN bus, and the temperature status of each group of grille lights 70 can be displayed on the dashboard Or on the central control display, let the driver understand the working status of the lamps more clearly. That is to say, when an over-temperature fault occurs, the MCU chip 20 can not only adjust the current of the grille lamp 70, but also alarm the host computer 30 through the CAN bus to remind the driver to pay attention.

According to an embodiment of the present invention, the power supply module 50 includes a constant current supply module 51 and an LDO power supply module 52 .

Specifically, the constant current source module 51 is connected to the LED driver chip 40 to supply power to the LED driver chip 40 , and the LDO power supply module 52 is connected to the MCU chip 20 and the bus transceiver 60 to supply power to the MCU chip 20 and the bus transceiver 60 . Among them, the LDO power supply module 52 is connected to the bus transceiver 60 and the MCU chip 20 through power supply lines respectively. The MCU chip 20 uses the KEA128Pin64 chip of NXP Company, the LIN transceiver model is TJA1020, and the LED driver chip adopts the TLC6C5724- Q1 chip.

According to yet another embodiment of the present invention, the MCU chip 20 also includes a timer, and the timer starts when the temperature signal is greater than a threshold, and the duration of the grille lamp 70 under the temperature signal exceeds a predetermined time, then the MCU chip 20 controls the LED The driver chip 40 adjusts the current of the grille lamp 70 and sends a feedback signal to the upper computer 30 through the bus transceiver 60 . That is to say, the timer in the MCU chip 20 can effectively avoid the frequent flickering of the LED lights caused by the temperature of the LED hovering around the alarm threshold.

Preferably, the LED driver chip 40 is connected to the MCU chip 20 through the SPI bus, and is used to receive the control signal of the MCU chip 20 , adjust the output PWM wave, and realize the current regulation of the grille lamp 70 .

Furthermore, the PTC temperature detection module 10 is a PTC thermistor, the higher the temperature is, the larger the value of the PTC thermistor is, and the response is sensitive.

According to an embodiment of the present invention, the feedback signal includes an alarm signal, and the host computer 30 can display the temperature signal and the alarm signal on the vehicle dashboard or the central control display screen, so that the driver can know the overheating situation of the grille lamp 70 at any time.

Optionally, the feedback signal further includes a control signal, and the LED driver chip 40 can receive the control signal and adjust the current of the plurality of grill lights 70 according to the control signal.

In a word, according to the vehicle lamp over-temperature protection system 100 of the embodiment of the present invention, the temperature of the grille lamp 70 is detected by the PTC temperature signal detection module, and the control signal of the MCU chip is received by the LED driver chip 40 to realize the brightness of the grille lamp 70 regulation and temperature regulation, the vehicle lamp over-temperature protection system 100 can avoid failure of the vehicle lamp due to excessive temperature, and ensure the safety of vehicle driving.

The vehicle according to the embodiment of the second aspect of the present invention includes the vehicle lamp over-temperature protection system 100 according to the above-mentioned embodiment. Since the vehicle lamp over-temperature protection system 100 according to the above-mentioned embodiment of the present invention has the above-mentioned technical effects, therefore, according to the implementation of the present invention The vehicle of the example also has a corresponding technical effect, which can prevent the failure of the vehicle lamp due to excessive temperature and ensure the safety of vehicle driving.

According to the third aspect of the present invention, the over-temperature protection method for vehicle lights includes the following steps:

S1. Detect the temperature of the grille lamp 70 to obtain a temperature signal;

S2, judging whether the temperature signal is lower than a preset threshold, and generating a feedback signal when the temperature signal exceeds the threshold;

S3, start the timer, adjust the current of the grille lamp 70 and send a feedback signal;

S4. Repeat step S2 and step S3 until the temperature signal of the grille lamp 70 is lower than the threshold value, control the driving current of the grille lamp 70 to recover, and cancel the feedback signal.

Further, the over-temperature protection method of the lamp also includes:

S5. During the preset time, when the driving current of the grille lamp 70 is weakened and the temperature signal is higher than the threshold, the operating current of the grille lamp 70 is controlled to be turned off, and a feedback signal is sent.

Specifically, during product design or production, the threshold value of the over-temperature alarm can be preset for the MCU chip 20 (it can also be changed according to actual conditions). When the grille lights 70 work normally, the MCU chip 20 acquires the working temperature of each group of grille lights 70 in real time by performing AD sampling on the signal of the PTC temperature detection module 10 , and feeds back to the host computer 30 in real time through the CAN bus. The upper computer 30 can display the real-time temperature of the grille lamp 70 on the central control display screen or the instrument panel through the feedback signal.

When the temperature of a certain group of grille lights 70 is too high, that is, when it is higher than the preset threshold, the MCU chip 20 starts the timer. The MCU chip 20 controls the LED driver chip 40 to adjust the PWM wave to reduce the LED current and control the temperature of the LED. At the same time, an alarm is sent to the upper computer 30 through the CAN bus. In order to ensure the consistency of light emission of grille lights 70, even if only one group of grille lights 70 has an LED over-temperature fault, the LED circuits of all grille lights 70 will be adjusted, because overheating of one group of grille lights 70 also means The grill lamps 70 of other groups have the risk of overheating, and preventive measures need to be taken in advance.

When the LED temperature improves and is lower than the preset threshold, the MCU chip 20 controls the LED driving chip 40 to restore the normal LED driving current. Simultaneously, an alarm signal is sent to the upper computer 30 through the CAN bus, and the timer of the MCU chip 20 is reset.

When the current of grille lamp 70 is weakened, the temperature of grille lamp 70 does not improve all the time, and this overheating state lasts for more than several minutes (can be changed according to the actual situation), then MCU chip 20 controls LED driver chip 40 to turn off the LED working current. At the same time, a fault status signal is reported through the CAN bus. The vehicle lamp over-temperature protection method can prevent the vehicle lamp from malfunctioning due to excessive temperature, and ensure the driving safety of the vehicle.

The above description is a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications can also be made. It should be regarded as the protection scope of the present invention.

Claims (12)

1. a kind of car light overheat protector system can be used in the Grille lamp for protecting vehicle, the Grille lamp is by multiple LED light groups Include: at, which is characterized in that the car light overheat protector system

Multiple PTC temperature detecting modules, multiple PTC temperature detecting modules are connected respectively with multiple Grille lamps to distinguish The temperature of the corresponding Grille lamp is detected, and obtains temperature signal；

MCU chip, the MCU chip are respectively connected with multiple PTC temperature detecting modules, and the MCU chip can be used in Judge whether the temperature signal is more than threshold value, if being more than, sends feedback signal；

Host computer, the host computer are connected with the MCU chip, and the host computer can receive the feedback signal and notify vehicle Driver；

LED drive chip, the LED drive chip are respectively connected with the MCU chip and multiple Grille lamps, the LED Driving chip can receive the feedback signal and adjust the electric current of multiple Grille lamps；

Power module, the power module are respectively connected with the MCU chip and the LED drive chip, the power module It can power to the MCU chip and the LED drive chip.

2. car light overheat protector system according to claim 1, which is characterized in that further include:

Bus transceiver, the bus transceiver are connected with the MCU chip, and the MCU chip passes through the bus transceiver The feedback signal is fed back to the host computer.

3. car light overheat protector system according to claim 2, which is characterized in that the bus transceiver is CAN transmitting-receiving Device, the CAN transceiver are connected with the MCU chip by signal wire.

4. car light overheat protector system according to claim 2, which is characterized in that the power module includes:

Constant current source module, the constant current source module are connected to power to the LED drive chip with the LED drive chip；

LDO power supply module, the LDO power supply module are connected with to the MCU core with the MCU chip and the bus transceiver Piece and bus transceiver power supply.

5. car light overheat protector system according to claim 2, which is characterized in that the MCU chip further include:

Timer, the timer starts when the temperature signal is greater than threshold value, and the Grille lamp is under the temperature signal Duration is more than the predetermined time, then the MCU chip controls the LED drive chip and adjusts the electric current of the Grille lamp simultaneously The feedback signal is sent to the host computer by the bus transceiver.

6. car light overheat protector system according to claim 1, which is characterized in that the LED drive chip and the MCU Chip is connected by spi bus.

7. car light overheat protector system according to claim 1, which is characterized in that the PTC temperature detecting module is PTC Thermistor.

8. car light overheat protector system according to claim 1, which is characterized in that the feedback signal includes alarm signal Number, the host computer can show the temperature signal and the alarm signal in meter panel of motor vehicle or middle control display screen On.

9. car light overheat protector system according to claim 8, which is characterized in that the feedback signal further includes control letter Number, the LED drive chip can receive the control signal and according to the control multiple Grille lamps of Signal Regulation Electric current.

10. a kind of vehicle, which is characterized in that including car light overheat protector system of any of claims 1-9.

11. a kind of car light excess temperature protection method, which comprises the following steps:

S1, the temperature for detecting Grille lamp, obtain temperature signal；

S2, judge whether the temperature signal is lower than preset threshold value, when the temperature signal exceeds the threshold value, generate anti- Feedback signal；

S3, starting timer, adjust the electric current of the Grille lamp and send the feedback signal；

S4, the temperature signal for repeating step S2 and step S3 to the Grille lamp control the Grille lamp lower than the threshold value Driving current is restored, and releases the feedback signal.

12. car light excess temperature protection method according to claim 11, which is characterized in that further include:

S5, within a preset time controls institute when the driving current of the Grille lamp weakens and the temperature signal is higher than threshold value The operating current for stating Grille lamp is closed, and sends the feedback signal.