JP2010129258A - Lamp tool for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely detect an abnormality of a cooling fan. <P>SOLUTION: The lamp tool for a vehicle 1 is provided with a plurality of light source units 30-1 to 30-N having LEDs 40-1 to 40-N, respectively, a cooling fan 50 for cooling the LEDs 40-1 to 40-N, and a control unit 10 controlling a fan driving current for driving the cooling fan 50 and containing a control part 18 for carrying out determination treatment to the cooling fan 50. The cooling fan 50 includes a protecting function alternatively repeating a first input of a fan driving current Sf sent from the control part 18, and a second input with higher current value than that of the first input, when a rotational frequency of the cooling fan 50 is to be less than a predetermined rotational frequency. The control part 18 determines the cooling fan 50 as abnormal when a condition with the value of the fan driving current Sf being less than the predetermined current value continues one hour or more. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a technical field for controlling driving of a cooling fan that suppresses heat generation of a semiconductor light source in a vehicular lamp.

  The vehicular lamp includes, for example, a plurality of light source units each having a light emitting diode (LED) as a semiconductor light source and a current supply unit that supplies a drive current to the LEDs, and a plurality of light source units via power supply lines, respectively. And a control unit having a plurality of switch means for controlling the dimming of each LED and a control unit for controlling on / off of each switch means, and a cooling fan for cooling the LEDs.

  The control unit controls turning on and off of the LEDs and dimming, and also controls the rotational drive of the cooling fan.

  The cooling fan has a function of preventing high temperature of the LED due to heat generated from the LED by sending wind generated by rotation of the propeller in the cooling fan to the LED side (see, for example, Patent Document 1).

  In such a vehicular lamp, the cooling fan continues to input the fan drive current even when the cooling fan becomes abnormal and the rotational speed becomes less than a predetermined rotational speed. There is a risk of fan failure. Therefore, in order to prevent the above-described failure due to heat generation, the cooling fan alternately repeats the fan drive current as the first input and the second input at different current values when the cooling fan becomes abnormal. A protection function for switching to the operation mode is provided.

  The first input current value at the first input is sufficiently smaller than the second input current value at the second input. For example, the first input current value is a weak current, and the second input current value is This is a steady current input to the cooling fan during normal operation.

JP 2001-216803 A

  The conventional vehicle lamp described above has a function of detecting an abnormality of the cooling fan in consideration of a factor indicating an abnormal state of the cooling fan, for example, an alternating input of different current values performed by the protection function. Not.

  Therefore, an object of the present invention is to reliably detect an abnormality in a cooling fan.

  A vehicle lamp according to an aspect of the present invention includes a plurality of light source units having a semiconductor light source, a cooling fan that cools the semiconductor light source, a fan driving current that drives the cooling fan, and the cooling fan. And a control unit that includes a control unit that performs a determination process on the cooling fan, wherein the cooling fan has a fan driving current sent from the control unit when the number of rotations of the cooling fan becomes less than a predetermined number of rotations. A protection function that alternately repeats a first input and a second input having a current value higher than the current value of the first input, wherein the control unit has a predetermined current value of the fan driving current; The cooling fan is determined to be abnormal when the state is less than the first time or longer.

  Therefore, when the state where the fan drive current is less than the predetermined value continues for a predetermined time, an abnormality of the cooling fan is detected.

  The vehicle lamp according to the present invention controls a plurality of light source units having a semiconductor light source, a cooling fan for cooling the semiconductor light source, a fan driving current for driving the cooling fan, and a determination process for the cooling fan. A control unit including a control unit for performing the cooling, wherein the cooling fan has a first input of a fan driving current sent from the control unit when the number of rotations of the cooling fan becomes less than a predetermined number of rotations And a protection function that alternately repeats the second input having a current value higher than the current value of the first input, and the control unit is in a state where the value of the fan drive current is less than a predetermined current value Is determined to be abnormal when the cooling fan continues for a first time or more.

  Therefore, the abnormality of the cooling fan can be reliably detected.

  In the invention described in claim 2, the determination process is repeatedly performed by the control unit, and the control unit determines the fan drive current in the determination process after determining that the cooling fan is abnormal. Since it is determined that the cooling fan is normal when the state where the value is equal to or greater than the predetermined current value continues for the second time or longer, it is possible to improve the accuracy of detecting the abnormality of the cooling fan. .

  In the invention described in claim 3, the first time is set to be equal to or shorter than a first input time during which the first input is performed, and the second time is the second time. Is set so as to be longer than the second input time during which input is performed.

  Therefore, since the weak current can be reliably detected by setting the first time to be equal to or shorter than the first input time, it is possible to reliably perform the abnormality determination. In addition, since the steady current can be reliably detected by setting the second time to be longer than the second input time, normality can be reliably determined.

  In the invention described in claim 4, when it is determined that the cooling fan is abnormal, an abnormality flag indicating abnormality is stored in the storage unit of the control unit and counted up, and the count value is The notification signal having the abnormality flag is sent from the control unit when the value exceeds a predetermined threshold value, so that it is possible to improve the accuracy of detecting the cooling fan abnormality and the notification accuracy.

  In the invention described in claim 5, when it is determined that the cooling fan is abnormal or normal, an abnormality flag indicating abnormality or a normal flag indicating normal is stored as a determination flag in the control unit. Is counted up to a predetermined count value determined in advance, and the control unit determines whether the determination flag is the abnormal flag or the normal flag for each count, and the total count When the ratio of the number of the abnormality flags to the number exceeds a predetermined ratio, a notification signal having the abnormality flag is transmitted from the control unit.

  Accordingly, it is possible to further improve the accuracy of detecting the abnormality of the cooling fan.

  Embodiments of the vehicular lamp according to the present invention will be described below. FIG. 1 is a diagram showing a circuit configuration of a vehicular lamp according to an embodiment of the present invention.

  The vehicular lamp 1 includes a control unit 10, N (N is an integer of 2 or more) light source units 30-1 to 30 -N, and a cooling fan 50.

  The control unit 10 includes an input circuit 15, a control unit 18, a constant voltage circuit 19 that supplies a fan drive current Sf to the cooling fan 50, a current detection circuit 11 that detects the fan drive current Sf, and N switches. It is configured to include the elements SW-1 to SW-N.

  The control unit 18 includes a CPU (Central Processing Unit) 16 that sends on / off signals to the switch elements SW-1 to SW-N and the switch elements (not shown) of the constant voltage circuit 19, and a memory (not shown). ).

  The input circuit 15 mainly includes a noise filter and a surge protection element (surge absorber / power Zener) such as a dump surge. Therefore, application of an overvoltage surge to the cooling fan 50 can be prevented.

  As the switch elements SW-1 to SW-N, it is preferable to use semiconductor elements such as FETs (Field effect transistors) and IGBTs (Insulated Gate Bipolar Transistors).

  The control unit 10 is provided with power terminals 21 and 23, a signal input terminal 25, (N + 1) power output terminals 35-1 to 35- (N + 1), and a power output terminal 36 on the GND (ground) side. .

  The power supply terminal 21 is connected to the plus terminal of an in-vehicle battery (DC power supply) mounted on the vehicle via the power input terminal 20, and the power supply terminal 23 is connected to the minus terminal of the in-vehicle battery via the power input terminal 22 ( GND).

  The signal input terminal 25 is connected to a communication signal input terminal 24. A communication signal is input / output from / to a communication signal input terminal 24 from a control device (not shown) for controlling various functions attached to the vehicle. It is like that.

N power supply output terminals 35-1 to 35 -N are connected to N switch elements SW- 1 to SW-N, respectively. (Not shown) and connected to the current detection circuit 11.

  The current detection circuit 11 includes a shunt resistor R1, resistors R2 to R4, and PNP transistors 12 and 13 whose bases are connected to each other, and a collector of the PNP transistor 12 is connected to the CPU 16. One end of the shunt resistor R1 is connected to the constant voltage circuit 19, and the other end is connected to the cooling fan 50 via the power output terminal 35- (N + 1).

  Each of the light source units 30-1 to 30-N includes switching regulators 32-1 to 32-N that function as current supply units, control circuits 33-1 to 33-N, and light emitting diodes (LEDs) as semiconductor light sources. Light Emitting Diode) 40-1 to 40-N. The switching regulators 32-1 to 32-N include a transformer or a coil, a capacitor, a diode, and an NMOS (Negative channel Metal Oxide Semiconductor) transistor. The LEDs 40-1 to 40-N are used as light sources for various vehicle lamps such as a headlamp, a stop & tail lamp, a fog lamp, and a turn signal lamp.

  Each switching regulator 32-1 to 32-N has a function of supplying a drive current S1 to the LEDs 40-1 to 40-N, respectively. Inside the switching regulators 32-1 to 32-N, shunt resistors (not shown) are provided as circuit elements for detecting currents supplied to the LEDs 40-1 to 40-N and controlling the current values. Is provided.

  Each control circuit 33-1 to 33-N controls the drive current S1 supplied to each LED 40-1 to 40-N so that the voltage across the shunt resistor is constant.

  The light source units 30-1 to 30-N are provided with input terminals 45-1 to 45-N, respectively. The input terminals 45-1 to 45-N are connected to power supply output terminals 35-1 to 35-N, respectively. The light source units 30-1 to 30-N are provided with input terminals 46-1 to 46-N, respectively. The input terminals 46-1 to 46-N are connected to the power output terminal 36.

  The two input terminals of the cooling fan 50 are connected to the power output terminal 35- (N + 1) and the power output terminal 36 via the signal line L2 and the signal line L1, respectively.

  When an ON signal is sent from the CPU 16 to the N switch elements SW-1 to SW-N and the switch elements of the constant voltage circuit 19, the switch elements SW-1 to SW-N and the switch elements of the constant voltage circuit 19 are turned on. The driving current S2 is supplied to the switching regulators 32-1 to 32-N, and at the same time, the fan driving current Sf is supplied to the cooling fan 50 via the current detection circuit 11 and the signal line L2.

  The current detection circuit 11 detects the fan drive current Sf flowing through the shunt resistor R1. The detected fan drive current Sf is sent to the CPU 16 via the PNP transistors 12 and 13. Information on the current value or voltage value input to the CPU 16 is stored in a memory (not shown) in the CPU 5.

  When the driving current S2 is supplied to each of the switching regulators 32-1 to 32-N, the LED driving current S1 is supplied to the LEDs 40-1 to 40-N, and the LEDs 40-1 to 40-N are turned on.

  The cooling fan 50 is rotated by inputting the fan driving current Sf. The driving and stopping of the cooling fan 50 are controlled by turning on and off the switching elements of the constant voltage circuit 19 based on programs stored in the memory of the control unit 18, respectively.

  The cooling fan 50 is provided with a protection function for changing the input state of the fan drive current Sf to prevent a failure due to heat generation.

  The protection function is a switching means (not shown) for cooling the fan drive current Sf (steady current) sent from the control unit 18 when the rotation speed of the cooling fan 50 is less than a predetermined rotation speed. ) Is input to the cooling fan 50 alternately and continuously as two currents (weak current and steady current) having different current values. That is, when the protection function is executed, the first input (weak current) that is the first input current value and the second input (steady current) that is the second input current value that is higher than the first input current value. ) Are alternately input to the cooling fan 50. The first input current value and the second input current value are detected by the current detection circuit 11 and stored in the memory.

  A first example of the abnormality detection process of the abnormality detection program stored in the memory will be described below with reference to the flowchart of FIG.

  The above-described protection function is executed when the cooling fan 50 is abnormal. As described above, the first input state in the protection function is such that the first input current value is a weak current and the cooling fan 50 The fan drive current Sf input to is close to a blocked state. Therefore, in the following description, the state where the first input current is input to the cooling fan 50 will be referred to as a “cutoff state”, and the time during which the first input is performed will be described as a cutoff time. In addition, a state where the second input current is input to the cooling fan 50 will be simply referred to as “input state”, and the time during which the second input is performed will be described as input time.

  First, it is determined whether or not there is an operation (rotation drive) instruction for the cooling fan 50 (step S101). When there is an operation instruction for the cooling fan 50, it is determined whether or not the current value of the fan drive current Sf detected by the current detection circuit 11 is less than a predetermined value set in advance (step S102). .

  As shown in FIG. 3, the predetermined value is preset and stored in the memory so that the current value of the fan drive current Sf is less than the current value of the cooling fan 50 in a steady state.

  If the current value of the fan drive current Sf is less than the predetermined value (Yes in step S102), the abnormal count is incremented (step S103). Next, it is determined whether or not the abnormal count value is greater than or equal to a predetermined first threshold (step S104). If the abnormality count value is equal to or greater than the predetermined first threshold value (Yes in step S104), it is determined that there is an abnormality, the abnormality flag is 1 (abnormal flag = 1) (step S105), and the abnormality flag 1 is stored in the memory. Is remembered.

  The abnormality flag is a determination flag included in a notification signal sent from the CPU 16 to the control device attached to the vehicle, and is information indicating that the cooling fan 50 is abnormal. When the abnormality flag is 1 (hereinafter, “abnormal flag = 1” is referred to as “abnormal flag 1”), it means that the abnormal flag is set and the cooling fan 50 is abnormal, and the abnormal flag is 0 ( When the abnormality flag = 0), the normal flag is set, which means that the cooling fan 50 is normal.

  The case where the abnormal count value is equal to or greater than a predetermined first threshold means an abnormal state where the cutoff state of the fan drive current Sf continues for a predetermined first time. The first time is stored in the memory.

  FIG. 4 shows the normal / abnormal state of the cooling fan 50 and the control state of the fan drive current Sf in the normal / abnormal state. As shown in FIG. 4, when the cooling fan 50 is in a normal state, the fan drive current Sf is continuously input. Further, when the cooling fan 50 is in an abnormal state, the cutoff state and the input state of the fan drive current Sf are alternately repeated, and the protection function of the cooling fan 50 is executed.

  FIG. 4 shows, as an example, a case where the first time and the cutoff time of the fan drive current Sf are the same. However, the first time is not limited to the same as the cutoff time of the fan drive current Sf, but may be set in advance so as to be equal to or shorter than the cutoff time. The reason for this is that if the first time is set to be longer than the cutoff time, a part of the first time is the input time (input state corresponding to the second time in the lower part of FIG. 4). This is because the interruption state cannot be detected and the abnormality determination of the cooling fan 50 cannot be performed.

  In the determination process of step S104, when the abnormality count value is less than the first threshold value (No in step S104), it is determined to be normal and the abnormality flag is maintained at 0.

  It should be noted that the operation of the cooling fan 50 returns to the normal state after it is determined that the cooling fan 50 is abnormal, and the cooling fan 50 is determined to be normal in the detection process described later, or the cooling fan The state where the abnormality flag 1 is kept is maintained except when the operation of 50 is returned to the initial state.

  Further, when there is no operation (rotation drive) instruction to the cooling fan 50 (No in step S101), and the abnormality flag is set at that time, the abnormality flag is cleared (step S106). ) A normal flag is stored in the memory.

  As described above, by executing the abnormality detection process by the above-described abnormality detection program, the interruption state of the fan drive current Sf can be reliably detected, so the abnormality state of the cooling fan 50 is reliably determined. be able to.

  Next, a case where the determination process of the CPU 16 is started again after it is determined in step S105 in FIG. 2 that the cooling fan 50 is abnormal will be described. In the following description, it is assumed that the cooling fan 50 has returned to normal before the determination process of the CPU 16 starts again after the abnormality determination.

  If it is determined in step S105 that the cooling fan 50 is abnormal, the determination flag is the abnormality flag 1.

  After it is determined in step S105 that the cooling fan 50 is abnormal, the process of step S102 is performed again. That is, it is determined whether or not the detected current value of the fan drive current Sf is less than a predetermined value.

  If the current value of the fan drive current Sf is less than the predetermined value, the processes of steps S103 to S105 are performed. If the current value of the fan drive current Sf is equal to or greater than the predetermined value (No in step S102), the abnormal count is cleared (step S107).

  Next, it is determined whether or not the abnormality flag is 1 (step S108). It is determined that the abnormality flag is 1 (Yes in step S108), and the normal count is incremented (step S109).

  Next, it is determined whether or not the normal count value is greater than or equal to a predetermined second threshold value (step S110). Since the operation of the cooling fan 50 has returned to the normal state, the normal count value becomes equal to or greater than the predetermined second threshold (Yes in step S110), it is determined as normal, and the abnormal flag is cleared (abnormal flag = 0). (Step S105), a normal flag is stored in the memory.

  The case where the normal count value is equal to or greater than the predetermined second threshold means a normal state where the input state of the fan drive current Sf continues for a predetermined second time. The second time is preset and stored in the memory so as to be longer than the input time. FIG. 4 shows, as an example, a case where the second time (t2) is longer than the input time (t1) of the fan drive current Sf. Therefore, since the steady current can be reliably detected by setting the second time to the time (t2) longer than the input time (t1), the time (t2) longer than the input time (t1) during the execution of the protection function. Thus, the normal state in which the operation is continued can be reliably detected, and the normality determination can be reliably performed.

  If the cooling fan 50 changes from the normal state to the abnormal state again during the determination process in step S108, it is determined in step S108 that the abnormality flag is not 1 (No in step S108), and the normal count is cleared. (Step S112), the count value returns to the initial value (default).

  If the cooling fan 50 changes from the normal state to the abnormal state again during the determination process in step S110, the normal count value becomes less than the predetermined second threshold (No in step S110) and is determined to be abnormal in step S110. The abnormality flag is maintained at 1.

  It should be noted that the magnitude of the fan driving current Sf in a steady state varies for each product of the cooling fan 50. Therefore, in the present invention, in the assembly process of the vehicular lamp 1, the fan driving current Sf at the normal time is measured for each product of the cooling fan 50 in advance, and according to the measured individual fan driving currents Sf. The predetermined value that is the determination reference value of the determination process in step S102 is set, and data of the set predetermined value is stored in the memory. Therefore, since the predetermined value for each product is set in advance during the assembly process, the determination process can be performed according to the variation in the magnitude of the fan drive current Sf in the steady state for each product described above. The determination accuracy can be improved.

  Next, after it is determined that the cooling fan 50 is abnormal (abnormal flag = 1) in the abnormality detection process (see FIG. 2), a notification signal including the abnormal flag 1 is used to control various functions attached to the vehicle. An example of processing (abnormal treatment) to be sent to the control device will be described with reference to the flowchart of FIG.

  The program processing in FIG. 5 is started after, for example, the abnormality determination in step S105 of the program processing in FIG.

  First, it is determined whether or not the abnormality flag is 1 (whether or not the abnormality flag is 1) (step S201). If the abnormality flag is 1, the count value is counted up (step S202). ).

  Next, it is determined whether or not the count value is greater than or equal to a predetermined value (step S203). If the count value is greater than or equal to the predetermined value, an abnormality treatment for the cooling fan 50 is executed (step S204).

  If the abnormality flag is not 1 in step S201, the count is cleared (step S205).

  As described above, by performing the program processing of FIG. 5, a predetermined time elapses after the abnormality determination of the cooling fan 50 is performed, and then the abnormality treatment is executed. Notification accuracy can be improved.

  Next, referring to the flowchart of FIG. 6 for another example of the abnormality treatment after it is determined in the abnormality detection process (see FIG. 2) that the cooling fan 50 is abnormal (abnormal flag = 1). explain.

  The program processing in FIG. 6 is started after, for example, the abnormality determination in step S105 of the program processing in FIG.

  First, the count value is counted up (step S301). It is determined whether or not the abnormality flag is 1 for each count until the count value reaches 9 (steps S302, S303, S306,..., S309). If the count value is greater than 9, the count is cleared (step S314).

  When the count value is 0 and the abnormality flag is 1, the variable 0 = 1 is set (step S304), and when the abnormality flag is not 1, the variable 0 is set (step S305). Subsequently, when the count value is 1 and the abnormality flag is 1, variable 1 = 1 is set (step S307), and when the abnormality flag is not 1, variable 1 = 0 is set (step S308). In this way, processing similar to the above is performed until the count value reaches 9.

  Next, it is determined whether or not to perform the abnormality treatment based on the ratio of “0” and “1” in all the variables (0 to 9). Specifically, the ratio of the number of abnormal flags 1 in the total count (0 to 9) to the total count number (the sum of the number of abnormal flags 1 and the number of normal flags: 10 in this example) is a predetermined ratio or more. It is determined whether or not there is (step S312). When the ratio of the number of the abnormality flag 1 to the total count is equal to or greater than a predetermined ratio, the abnormality treatment of the cooling fan 50 is executed (step S313).

  Therefore, the abnormality flag 1 determination process of the cooling fan 50 is performed a plurality of times within a predetermined time, and the abnormality treatment is executed only when the ratio of the abnormality flag 1 with respect to the total count number exceeds a predetermined ratio. The accuracy of detecting and notifying the fan 50 can be further improved. In the example of FIG. 6 described above, the case where the variables are 0 to 9 has been described. However, if more variables are used, more accurate abnormality detection and notification can be performed.

  Next, the specific contents of the abnormality treatment in addition to the abnormality notification to the vehicle will be described with reference to FIG. The configuration of the control unit 10 shown in FIG. 7 is the same as that of the control unit 10 shown in FIG. 1 except that the switch element SW− (N + 1) is connected in parallel to the constant voltage circuit 19. The constant voltage circuit 19 (series regulator) includes a switch element (not shown). The switch element incorporated in the constant voltage circuit 19 has a function of stopping the operation of the constant voltage circuit 19 in response to an off signal from the CPU 16.

  As an abnormal measure when the cooling fan 50 is abnormal, in addition to sending the above notification signal to the vehicle (abnormal notification), the fan drive voltage supplied to the cooling fan 50 simultaneously with the abnormality determination of the cooling fan 50 is used. There is a process to increase.

  The constant voltage circuit 19 in the control unit 10 outputs a constant voltage (for example, 5 V) in order to stabilize the driving of the cooling fan 50.

  For example, when the rotational speed decreases due to deterioration with time of the cooling fan 50 and an abnormality is determined, the CPU 16 sends an OFF signal to the switch element built in the constant voltage circuit 19 to stop the constant voltage circuit 19 and at the same time switch An ON signal is sent to the element SW- (N + 1) to turn on the switch element SW- (N + 1). As a result, the battery voltage Vin (= 12 V) is supplied to the cooling fan 50. Therefore, when it is determined that the cooling fan 50 is abnormal, the drive voltage is increased to increase the rotational speed, thereby extending the life of the cooling fan 50 and the LEDs 40-1 to 40- associated with the decrease in the rotational speed. It is possible to suppress deterioration of N due to heat.

  Each of the above-described embodiments is merely an example of a preferred embodiment of the present invention, and the present invention can be implemented with various modifications without departing from the gist thereof.

It is the figure which showed the circuit structure of the vehicle lamp which concerns on embodiment of this invention. It is the flowchart which showed an example of the abnormality detection program of a cooling fan. It is a figure for demonstrating the predetermined value as a determination reference value at the time of determining the electric current value of a fan drive current. It is a figure for demonstrating control of the fan drive current corresponding to the normal / abnormal state of a cooling fan. It is the flowchart which showed an example of the program which performs abnormality treatment. It is the flowchart which showed the other example of the program which performs abnormality treatment. It is a figure for demonstrating the method of the abnormality treatment after an abnormality detection process.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Vehicle lamp, 10 ... Control unit, 18 ... Control part, 30-1-30-N ... Light source unit, 40-1-40-N ... LED (semiconductor light source), 50 ... Cooling fan

Claims (5)

A plurality of light source units each having a semiconductor light source;
A cooling fan for cooling the semiconductor light source;
A control unit including a control unit that controls a fan driving current for driving the cooling fan and performs a determination process on the cooling fan;
The cooling fan is higher than a first input of a fan driving current sent from the control unit and a current value of the first input when the number of rotations of the cooling fan becomes less than a predetermined number of rotations. It has a protection function that alternately repeats the second input as the current value,
The said control part determines with the said fan for cooling being abnormal when the state where the value of the said fan drive current is less than predetermined | prescribed electric current value continues more than 1st time. The vehicle lamp characterized by the above-mentioned. The determination process is repeatedly performed by the control unit,
In the determination process after determining that the cooling fan is abnormal, the control unit performs the cooling when the state where the value of the fan drive current is equal to or greater than the predetermined current value continues for a second time or more. The vehicle lamp according to claim 1, wherein the vehicle fan is determined to be normal. The first time is set to be equal to or shorter than a first input time when the first input is performed,
The vehicular lamp according to claim 2, wherein the second time is set to be longer than a second input time during which the second input is performed. When it is determined that the cooling fan is abnormal, an abnormality flag indicating abnormality is stored in the storage unit of the control unit and counted up,
4. The vehicular lamp according to claim 1, wherein a notification signal having the abnormality flag is transmitted from the control unit when a count value is equal to or greater than a predetermined threshold value. 5. When it is determined that the cooling fan is abnormal or normal, an abnormality flag indicating abnormality or a normal flag indicating normal is stored as a determination flag in the storage unit of the control unit and predetermined predetermined It is counted up until it reaches the count value,
Whether the determination flag is the abnormal flag or the normal flag is determined for each count by the control unit,
The notification signal having the abnormality flag is sent from the control unit when the ratio of the number of the abnormality flag to the total count becomes a predetermined ratio or more. Vehicle lamps.

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