JP5487841B2 - Interior light control device - Google Patents

Description

  The present invention relates to an interior light control device that performs lighting control of an interior light mounted in a vehicle.

  Various interior lamps such as a room lamp, a dome lamp, and a map lamp are provided in the vehicle, and lighting / extinguishing of the interior lamp is controlled in accordance with a user's switch operation or opening / closing of a vehicle door. For example, the visibility inside the vehicle can be improved by turning on the interior light when the passenger gets off or gets on at night.

  In Patent Document 1, a switching circuit that adjusts a voltage supplied from a battery and outputs the adjusted voltage to a light emitter such as a lamp is provided, and the switching circuit is controlled based on the battery voltage without using an ignition signal or the like. In addition, there has been proposed a vehicle lighting device that can reduce signal harnesses laid on a vehicle and prevent battery from running out.

JP 2008-143203 A

  The interior light is also used when searching for a vehicle in the night or when checking a map. When a passenger in a passenger seat or a rear seat of a vehicle (that is, an occupant other than the driver) uses an interior light at night, the vehicle may be running. When the interior light is turned on while the vehicle is traveling at night, there is a problem that the driver is prevented from driving the vehicle. The vehicular lighting device described in Patent Document 1 cannot solve this problem.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide an interior light control device capable of suppressing the lighting of the interior light from interfering with the driving of the driver. There is to do.

The interior light control device according to the present invention includes an operation state acquisition means for acquiring an operation state of an operation unit related to lighting / extinguishing of an interior light mounted in a vehicle, and an operation state acquired by the operation state acquisition means. In a state in which the interior lamp is to be lit, the control means includes a control unit that performs control for lighting the interior lamp, and a speed acquisition unit that acquires a traveling speed of the vehicle, and the control unit includes the speed acquisition unit. according to the acquired traveling speed, Ri Citea to adjust the illuminance of the vehicle lamp, with an increase in the running speed, stepwise reduces the illumination of the interior light, with a decrease in the running speed The illuminance of the interior light is increased stepwise .

  The interior light control device according to the present invention is characterized in that the control means reduces the illuminance of the interior light when the traveling speed acquired by the speed acquisition means exceeds a threshold value. .

  Further, in the interior light control device according to the present invention, the control means intermittently supplies power from a power source to light the interior light, and according to the traveling speed acquired by the speed acquisition means. The illuminance of the interior lamp is adjusted by adjusting the power supply / non-supply ratio.

  The interior light control device according to the present invention further includes voltage acquisition means for acquiring the voltage of the power source, and the control means adjusts the ratio according to the voltage acquired by the voltage acquisition means. It is characterized by being.

  In the present invention, the interior light control device that performs illumination control of the interior light turns on the interior light when the interior lighting operation is performed by an occupant's switch operation or the like, and the interior light according to the traveling speed of the vehicle. Adjust the illuminance. As a result, when the vehicle travels and there is a possibility that the lighting of the interior light may hinder the driver, the illuminance of the interior light can be reduced, and the interior light can be prevented from obstructing the driving. be able to.

  In the present invention, the traveling speed of the vehicle is acquired, and the traveling speed is compared with a threshold value to determine whether or not the vehicle is traveling. When it is determined that the traveling speed exceeds the threshold value and the vehicle is traveling, the illumination of the interior lamp is reduced because lighting of the interior lamp may hinder driving. When it is determined that the vehicle is not running, that is, when the vehicle is stopped, the lighting of the interior lamp does not interfere with driving, so the illuminance of the interior lamp can be increased and the convenience of the interior lamp can be improved. it can.

  Further, in the present invention, during traveling of the vehicle, the interior light control device gradually decreases the illumination intensity of the interior lamp as the traveling speed of the vehicle increases, and the illumination intensity of the interior lamp as the travel speed decreases. Increase in steps. This makes it possible to reduce the illuminance of the interior lamp during high-speed travel with a high degree of danger when the lighting of the interior lamp is obstructed, and to increase the illuminance of the interior lamp during low-speed travel with a low degree of danger.

  In the present invention, the lighting of the interior lamp is performed by intermittently supplying power from a power source such as a vehicle battery or an alternator to the interior lamp and adjusting the ratio of power supply / non-supply. Adjust the illuminance. That is, the illuminance of the interior lamp is adjusted by supplying power from the power source to the interior lamp by PWM (Pulse Width Modulation) control and adjusting the duty ratio. Thereby, while being able to reduce the electric power consumption by an interior lamp, the increase / decrease in the illumination intensity of an interior lamp can be implement | achieved easily.

  Further, in the present invention, the illuminance of the interior lamp is adjusted by acquiring the voltage of the power supply and adjusting the duty ratio of the PWM control according to the acquired power supply voltage. Thereby, for example, when the voltage of the battery decreases, it is possible to prevent the illuminance from fluctuating with respect to the fluctuation of the power supply voltage, such as increasing the duty ratio to prevent the illuminance from decreasing.

  In the case of the present invention, the interior light control device adjusts the illuminance of the interior light according to the traveling speed of the vehicle, thereby suppressing lighting of the interior light from hindering the driving of the driver. it can. Therefore, the brightness of the interior lamp can be obtained within a range that does not hinder driving while the vehicle is running, and the sufficient brightness of the interior lamp can be ensured when the vehicle is stopped. It is possible to achieve safe driving and improved convenience of interior lights.

It is a block diagram which shows the structure of the interior light control apparatus which concerns on this invention. It is a flowchart which shows the procedure of the illumination intensity adjustment process of the lamp which the vehicle interior light control apparatus which concerns on this invention performs. It is a schematic diagram for demonstrating the illumination intensity adjustment of the lamp which the interior lamp control apparatus which concerns on a modification is performed. It is a flowchart which shows the procedure of the illumination intensity adjustment process of the lamp which the interior lamp control apparatus which concerns on a modification performs.

  Hereinafter, the present invention will be specifically described with reference to the drawings showing embodiments thereof. FIG. 1 is a block diagram showing a configuration of an interior light control apparatus according to the present invention. In the figure, reference numeral 1 denotes an interior light control device that controls lighting / extinguishing of a lamp (interior light) 2 provided in a vehicle (not shown) and illuminance at the time of lighting. The lamp 2 is an interior lamp such as a room lamp, a dome lamp, or a map lamp provided on the ceiling of the vehicle interior.

  The interior light control device 1 is arranged in the power supply path from the power source such as the alternator 5 and the battery 6 mounted on the vehicle to the lamp 2, and switches between supply / non-supply of power from the power source to the lamp 2, And the lighting control of the lamp 2 is performed by controlling the supply amount of electric power. The alternator 5 is a power generator that generates power in accordance with the operation of a vehicle engine (not shown). The battery 6 stores the power generated by the alternator 5 and supplies the stored power to the lamp 2 and other in-vehicle devices when the engine of the vehicle is stopped.

  The interior light control device 1 performs lighting control of the lamp 2 according to information given from the speed sensor 21 and the lighting switch 22. The speed sensor 21 is a sensor that detects a traveling speed mounted at an appropriate position of the vehicle, and notifies the interior lighting control device 1 of the detected traveling speed. The lighting switch 22 is provided in the vicinity of the lamp 2 in the vehicle, and is a switch for accepting a lighting / extinguishing operation of the lamp 2 by an occupant of the vehicle. Notify the interior light control device 1. In addition to the on / off state, the lighting switch 22 that receives a lighting operation such as a room lamp can be switched to a “DOOR” state that automatically turns on when the vehicle door is opened. However, in this embodiment, the “DOOR” state is included in the OFF state of the lighting switch 22.

  The interior light control device 1 includes a control unit 11, a power supply switching unit 12, a voltmeter 13, and the like. The control unit 11 includes an arithmetic processing device such as a CPU (Central Processing Unit), a memory element such as a RAM (Random Access Memory) or a ROM (Read Only Memory), and the like. And the control process of the operation of the power supply switching unit 12 are performed.

  The power supply switching unit 12 switches supply / non-supply of power from the power supply of the alternator 5 and the battery 6 to the lamp 2 in accordance with a control signal given from the control unit 11. The power supply switching unit 12 is realized by, for example, a switching element arranged in a power supply path between the power source and the lamp 2, and supplies power by switching on / off of the switching element according to a control signal from the control unit 11. Supply / non-supply of power can be switched by connecting / disconnecting the path. The voltmeter 13 measures the output voltage of the power source of the alternator 5 and the battery 6 and notifies the control unit 11 of the voltage value of the measurement result.

  The control unit 11 of the interior light control device 1 is inputted with the output voltage value of the power source measured by the voltmeter 13, the traveling speed of the vehicle detected by the speed sensor 21, and the on / off state of the lighting switch 22. The lighting control of the lamp 2 is performed based on these information. Below, control of the lamp | ramp 2 which the interior lamp control apparatus 1 performs is demonstrated in detail.

  The control unit 11 acquires the on / off state of the lighting switch 22 and performs control to turn on the lamp 2 if the lighting switch 22 is on, and turn off the lamp 2 if the lighting switch 22 is off. At this time, the control unit 11 outputs a pulse signal having a duty ratio corresponding to the output voltage value of the power source measured by the voltmeter 13 to the power supply switching unit 12 as a control signal. The power supply switching unit 12 connects / cuts off the power supply path from the power source to the lamp 2 in accordance with the control signal given from the control unit 11 (on / off of the switching element), and thereby according to the duty ratio. The lamp 2 is turned on with the power supply amount, that is, with the illuminance corresponding to the duty ratio.

The lighting control of the lamp 2 according to the duty ratio of the control signal performed by the interior light control device 1 is a so-called PWM control method. At this time, the duty ratio of the control signal output by the control unit 11 can be calculated by the following (Equation 1). In (Expression 1), the variable V is the output voltage value of the power source measured by the voltmeter 13, and Va is a constant.
Duty ratio = (Va / V) ² (Formula 1)

  Even when the output voltage value of the power supply fluctuates by outputting the control signal of the duty ratio calculated by (Equation 1) by the control unit 11, the direct current voltage Va [V] is applied to the lamp 2. Is stably supplied. That is, when the output voltage value V detected by the voltmeter 13 decreases, the duty ratio of the control signal output by the control unit 11 increases, and when the output voltage value V increases, the control signal Since the duty ratio decreases, the amount of power supplied to the lamp 2 is kept substantially constant. For example, when Va = 12 is set, the lamp 2 is lit with an illuminance equivalent to that when a DC voltage of 12 V is applied without being affected by fluctuations in the output voltage value of the power supply.

  Further, the control unit 11 of the interior light control device 1 determines whether or not the vehicle is traveling from the traveling speed of the vehicle detected by the speed sensor 21. The control unit 11 may determine whether or not the vehicle is traveling, for example, depending on whether or not the traveling speed of the vehicle is 0 km / h. For example, the traveling speed is very low (such as 10 km / h). Whether or not the vehicle is traveling may be determined according to whether or not the following is true.

  As a result of the determination, the control unit 11 lights the lamp 2 with normal illuminance if the vehicle is not traveling, and reduces the illuminance of the lamp 2 if the vehicle is traveling. Here, lighting with normal illuminance means that, for example, the constant Va = 12 is set in the above (Equation 1), and the lamp 2 is lit with the same illuminance as when a DC voltage of 12 V is applied. Further, when reducing the illuminance, the constant Va in (Equation 1) is set to a value lower than that of the normal illuminance (for example, Va = 10).

  FIG. 2 is a flowchart showing the procedure of the illuminance adjustment process of the lamp 2 performed by the interior lamp control device 1 according to the present invention, which is a process performed by the control unit 11 of the interior lamp control device 1. First, the controller 11 of the interior lamp control device 1 determines whether or not the lighting switch 22 is in an on state (step S1). If the lighting switch 22 is not in an on state (S1: NO), the lamp 2 Is turned off (step S2), the process returns to step S1, and waits until the lighting switch 22 is turned on.

  When the lighting switch 22 is in the ON state (S1: YES), the control unit 11 acquires the traveling speed of the vehicle detected by the speed sensor 21 (step S3), and acquires the voltage V of the power source detected by the voltmeter 13. (Step S4). Next, the control unit 11 determines whether or not the vehicle is traveling based on the traveling speed of the vehicle acquired in step S2 (step S5).

When the vehicle is not running (S5: NO), that is, when the vehicle is stopped, the control unit 11 calculates the duty ratio = (12 / V) ² using the power supply voltage V acquired in step S4, By outputting the control signal of the calculated duty ratio to the power supply switching unit 12, the lamp 2 is turned on at normal illuminance (step S6), and the process is terminated.

When the vehicle is traveling (S5: YES), the control unit 11 calculates the duty ratio = (10 / V) ² using the power supply voltage V acquired in step S4, and calculates the calculated duty ratio. Is output to the power supply switching unit 12 to reduce the illuminance of the lamp 2 (step S7), and the process ends. In addition, the control part 11 is performing the process of above-mentioned step S1-S7 repeatedly.

  In the interior light control device 1 having the above configuration, the lamp 2 is turned on when the lighting switch 22 is on, and whether or not the vehicle is traveling according to the traveling speed of the vehicle detected by the speed sensor 21. If the vehicle is traveling, the illuminance of the lamp 2 is reduced to prevent the lighting of the lamp 2 in the vehicle from obstructing the driving of the driver while the vehicle is traveling. Further, since the illuminance of the lamp 2 can be increased while the vehicle is stopped, which does not interfere with driving even when the lamp is lit, the convenience of the lamp 2 in the vehicle can be enhanced.

  The interior light control device 1 detects the voltage of the alternator 5 and the battery 6 with a voltmeter 13, calculates the duty ratio according to (Equation 1) according to the detected voltage, and outputs a control signal of the calculated duty ratio. By outputting from the control unit 11 to the power supply switching unit 12 and switching the supply / non-supply of power from the power source to the lamp 2 according to the duty ratio of the control signal, the illuminance of the lamp 2 is adjusted. Thus, it is possible to reduce the power consumption associated with the lighting of the lamp 2 and to prevent the illuminance of the lamp 2 from fluctuating with respect to the voltage fluctuation of the power source.

  In the present embodiment, the lamp 2 is lit with the same illuminance as when a DC voltage of 12V is applied while the vehicle is stopped, and the DC voltage of 10V is applied to the lamp 2 while the vehicle is running. Although the configuration is such that the lighting is performed with the same illuminance as the case, that is, the constant Va = 12V is set while the vehicle is stopped, and the constant Va = 10V is set while traveling, and the duty ratio is calculated by (Equation 1). And the numerical value of 10V is an example, Comprising: It does not restrict to this.

(Modification)
In addition, the interior light control device 1 according to Embodiment 1 is configured to adjust the illuminance of the lamp 2 in two steps depending on whether or not the vehicle is running, but is not limited thereto. The interior light control device 1 according to the modification is configured to adjust the illuminance of the lamp 2 in multiple stages according to the traveling speed of the vehicle detected by the speed sensor 21.

  FIG. 3 is a schematic diagram for explaining the illuminance adjustment of the lamp 2 performed by the interior lamp control device 1 according to the modification, and a graph in which the horizontal axis is the traveling speed of the vehicle and the vertical axis is the illuminance of the lamp 2. It is shown. The interior light control device 1 according to the modified example lights the lamp 2 with an illuminance equivalent to that when a DC voltage of 12 V is applied when the traveling speed detected by the speed sensor 21 is 0 km / h to 30 km / h (ie, (In equation (1), Va = 12V is set and the duty ratio is calculated).

  The interior light control device 1 lights the lamp 2 with the same illuminance as when a DC voltage of 11 V is applied when the traveling speed is 30 km / h to 60 km / h, and the traveling speed is 60 km / h to 90 km / h. In the case of h, the lamp 2 is lit with the same illuminance as when a DC voltage of 10 V is applied, and when the traveling speed exceeds 90 km / h, the lamp 2 is lit with the same illuminance as when a DC voltage of 9 V is applied. To do. As described above, the interior light control device 1 decreases the illuminance of the lamp 2 in a stepwise manner as the traveling speed of the vehicle increases, and increases the illuminance of the lamp 2 in a stepwise manner as the traveling speed of the vehicle decreases. .

  FIG. 4 is a flowchart showing the procedure of the illuminance adjustment process of the lamp 2 performed by the interior lamp control device 1 according to the modification. The control unit 11 of the interior lamp control device 1 according to the modification first determines whether or not the lighting switch 22 is in an on state (step S21). If the lighting switch 22 is not in an on state (S21: NO) The lamp 2 is turned off (step S22), the process is returned to step S21, and the process waits until the lighting switch 22 is turned on.

When the lighting switch 22 is in the ON state (S21: YES), the control unit 11 acquires the traveling speed of the vehicle detected by the speed sensor 21 (step S23) and acquires the voltage V of the power source detected by the voltmeter 13. (Step S24). Next, the control unit 11 determines whether or not the traveling speed of the vehicle acquired in step S2 exceeds 90 km / h (step S25). If the traveling speed exceeds 90 km / h (S25: YES), the duty is determined. The ratio = (9 / V) ² is calculated (step S26), and the control signal having the calculated duty ratio is output to the power supply switching unit 12, so that the lamp corresponding to 9V is turned on and the process is terminated. .

When the traveling speed does not exceed 90 km / h (S25: NO), the control unit 11 further determines whether or not the traveling speed of the vehicle exceeds 60 km / h (step S27). When the traveling speed exceeds 60 km / h (S27: YES), the control unit 11 calculates the duty ratio = (10 / V) ² (step S28), and sends the control signal of the calculated duty ratio to the power supply switching unit. By outputting to 12, the lamp corresponding to 10V is turned on, and the process ends.

When the traveling speed does not exceed 60 km / h (S27: NO), the control unit 11 further determines whether or not the traveling speed of the vehicle exceeds 30 km / h (step S29). When the traveling speed exceeds 30 km / h (S29: YES), the control unit 11 calculates duty ratio = (11 / V) ² (step S30), and the control signal of the calculated duty ratio is supplied to the power supply switching unit. By outputting to 12, the lamp corresponding to 11V is turned on, and the process ends. When the traveling speed does not exceed 30 km / h (S29: YES), the control unit 11 calculates duty ratio = (12 / V) ² (step S31), and switches the power supply to the control signal of the calculated duty ratio. By outputting to the unit 12, the lamp corresponding to 12V is turned on, and the process ends. Note that the control unit 11 repeatedly performs the processes in steps S21 to S31 described above.

  As described above, the interior light control device 1 may be configured to adjust the illuminance of the lamp 2 in multiple steps according to the traveling speed of the vehicle detected by the speed sensor 21, and the lamp 2 is controlled as the traveling speed increases. By reducing the illuminance stepwise and increasing the illuminance of the lamp 2 stepwise as the traveling speed of the vehicle decreases, it is possible to more reliably prevent the danger that the lighting of the lamp 2 hinders driving.

  In the above-described modification, the illuminance of the lamp 2 is changed using the traveling speeds of 30 km / h, 60 km / h, and 90 km / h as thresholds. However, the speeds of these thresholds are only examples. It is not limited. Moreover, although it was set as the structure which adjusts the illumination intensity of the lamp | ramp 2 according to driving speed in four steps, it is not restricted to this, It is good also as a structure which adjusts the illumination intensity of the lamp | ramp 2 in three steps or less or five steps or more. Furthermore, it is good also as a structure which adjusts the illumination intensity of the lamp | ramp 2 linearly according to increase / decrease in driving speed.

1 Car interior light control device 2 Lamp (car interior light)
5 Alternator 6 Battery 11 Control unit (operation state acquisition means, control means, speed acquisition means, voltage acquisition means)
12 Power Supply Switching Unit 13 Voltmeter 21 Speed Sensor 22 Lighting Switch (Operation Unit)

Claims (4)

Operation state acquisition means for acquiring an operation state of an operation unit related to lighting / extinguishing of an interior lamp mounted in the vehicle;
Control means for performing control to turn on the interior light when the operation state acquired by the operation state obtaining means is a state in which the interior light should be turned on;
Speed acquisition means for acquiring the traveling speed of the vehicle,
The control means includes
Depending on the travel speed in which the speed acquisition unit has acquired, Ri Citea to adjust the illuminance of the interior light,
As the travel speed increases, the illuminance of the interior light is reduced stepwise,
The interior light control device characterized in that the illumination intensity of the interior light is increased stepwise as the travel speed decreases . The interior light control device according to claim 1, wherein the control means reduces the illuminance of the interior light when the traveling speed acquired by the speed acquisition means exceeds a threshold value. The control means intermittently supplies power from a power source to turn on the interior lamp, and adjusts the power supply / non-supply ratio according to the traveling speed acquired by the speed acquisition means. The interior light control device according to claim 1 or 2 , wherein the illumination intensity of the interior light is adjusted by doing so. A voltage acquisition means for acquiring the voltage of the power supply;
The interior light control device according to claim 3, wherein the control means adjusts the ratio according to the voltage acquired by the voltage acquisition means.

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