JP2017088011A - Directional light control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide directional light control means which monitors a short circuit state while suppressing heat generation of driving means for driving a directional light.SOLUTION: A display device M for a vehicle is a directional light control device comprising: a winker lamp 11 which displays an operational state of a direction indicator; driving means 2 which outputs a first electric current A1 to the winker lamp 11, and outputs a first voltage V1 proportional to the first electric current A1; and control means 5 which outputs a switching signal SS, which causes to switch on/off an output of the first electric current A1, to the driving means 2, and determines a state of the winker lamp 11 based on a state of the switching signal SS and the first voltage V1. The control means 5 changes an output of switching switch SS to a periodic signal Oy of off of a first time P1 and on of a second time P2 shorter than the first time P1 when determining that the winker lamp 11 short-circuits during switching on of the switching signal SS.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a direction indicator lamp control device that monitors a lighting state of a direction indicator lamp.

  As a conventional direction indicator lamp control device, there is one disclosed in Patent Document 1. The direction indicator lamp control device includes a driving unit that controls the direction indicator lamp, a resistance element that is disposed between the driving unit and the direction indicator lamp, and a detection unit that detects a voltage across the resistance element. And a disconnection or a short circuit of the direction indicator lamp is determined based on the voltage detected by the detection means.

JP 2009-40285 A

  However, in order to determine that the short circuit has been resolved after detecting the short circuit, power must be continuously supplied to the direction indicator lamp in order to detect the voltage between the driving means and the direction indicator lamp. If comprised in this way, there exists a possibility that a drive means may generate | occur | produce heat. On the other hand, if the supply of power to the direction indicator lamp is stopped in order not to generate heat, a change in the voltage for detecting a short circuit cannot be detected, so that the cancellation of the short circuit cannot be detected.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a direction indicator lamp control unit that monitors a short-circuit state while suppressing heat generation of a drive unit that drives the direction indicator lamp.

The direction indicator lamp control device according to the present invention includes:
A blinker lamp that displays the operating status of the direction indicator,
Driving means for outputting a first current to the blinker lamp and outputting a first voltage proportional to the first current;
Control means for outputting a switching signal for turning on / off the output of the first current to the driving means and determining the state of the blinker lamp based on the state of the switching signal and the first voltage. A direction indicator light control device,
If it is determined that the blinker lamp is short-circuited while the switching signal is turned on, the control means turns off the output of the switching signal for a first time and for a second time shorter than the first time. Switch to periodic signal.

Further, the control means of the direction indicator lamp control device according to the present invention stops the output of the periodic signal when it is determined that the blinker lamp is short-circuited when the periodic signal is being output.
It is preferable to configure as described above.

  ADVANTAGE OF THE INVENTION According to this invention, the control means of the direction indicator lamp which monitors a short circuit state can be provided, suppressing the heat_generation | fever of the drive means which drives a direction indicator lamp.

The electrical block diagram of the control apparatus of the direction indicator light which concerns on one Embodiment of this invention. The figure which shows the switching signal at the time of the short circuit detection of the control apparatus, and a short circuit cancellation.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

As shown in FIG. 1, the direction indicator lamp control device according to the present invention includes a direction indicator lamp 10, a high-side driver (drive means) 2, a constant voltage circuit 3, a temperature detection means 4, and a control means 5. And a display device M for a vehicle mounted on a motorcycle including
The vehicle display device M is covered with a case body, and a circuit board on which the direction indicator lamp 10, the high-side driver 2, the constant voltage circuit 3, the temperature detection means 4, and the control means 5 are mounted is mounted on the case body. Contained.
The vehicle display device M is activated when the ignition IG is turned on after power is supplied from the battery B of the vehicle, and displays the state of the vehicle direction indicator switch SW by the direction indicator lamps 10 and 11.

  The direction indicator lamp 10 is an indicator lamp in the vehicle display device M that displays the operation state of the direction indicator by lighting or blinking, and is configured by a light emitting diode (LED), for example.

  The direction indicator lamp 11 is a blinker lamp outside the vehicle display device M that displays the operation state of the direction indicator by lighting or blinking, and is composed of, for example, a light emitting diode (LED).

  When the ignition IG is turned on, the high-side driver 2 is activated by being supplied with power of 8 to 16 V (second voltage) from the battery B of the vehicle, and is controlled by the control means 5 to be described later to the direction indicator lamp 11. Turn on / off the power supply to turn on / off the direction indicator lamp. When the high-side driver 2 supplies power to the direction indicator lamp 11, a predetermined current (first current) A1 flows. The high side driver 2 measures the first current A1 by providing a resistor in the current path through which the first current A1 flows, and measuring the voltage drop across the resistor, and is proportional to the first current A1. The first voltage V1 is output to the control means 5.

  The constant voltage circuit 3 transforms a voltage of 8 to 16 V supplied from the battery B of the vehicle into a predetermined voltage (for example, 5 V) and supplies the voltage to the control means 5.

  The temperature detection means 4 is a thermistor made of a resistor whose electrical resistance changes greatly with respect to temperature changes. The temperature detection means 4 detects the temperature of the high side driver 2 and outputs it to the control means 5.

  The control means 5 performs overall control of the entire vehicle display device. The control means 5 is a microcontroller provided with a CPU, a memory for storing a program to be operated by the CPU, a timer for measuring time, and various input / output ports.

  The control means 5 is activated when power is supplied from the constant voltage circuit 3. The control means 5 inputs the state of the direction indicator switch SW for operating the direction indicator, and outputs a switching signal SS for turning on / off the supply of power to the direction indicator lamp 11 to the high side driver 2 to thereby turn the direction indicator. Is displayed, and the direction indicator lamp 10 is turned on / off to display the operation state of the direction indicator.

  The control means 5 is provided with a resistor in the path through which the second voltage flows, and the second voltage is dropped in a predetermined voltage range and is input as the third voltage.

  The control unit 5 determines the direction based on the state (ON / OFF) of the switching signal SS output to the high side driver 2 and the comparison result between the first voltage V1 input from the high side driver 2 and a predetermined threshold value. It is determined whether the indicator lamp 11 is in a normal lighting / normal lighting / short circuit / disconnection state. Specific determination and control of each direction indicator lamp 10, 11 at that time will be described below.

(Determination of disconnection)
When the state of the switching signal SS is ON and the first voltage V1 is less than the first threshold Th1, the control means 5 controls the direction indicator lamp 11 to turn on, although it is controlling. It is estimated that the lamp 11 is not lit and it is determined that the direction indicator lamp 11 is disconnected. When the control means 5 determines that the direction indicator lamp 11 is disconnected, the control means 5 notifies that the direction indicator lamp 11 is disconnected by a not-shown notification means. Further, the control means 5 displays the state of the direction indicating switch SW by turning on (or blinking) and turning off by the direction indicating lamp 10 even while determining that the direction indicating lamp 11 is disconnected.

(Short-circuit judgment)
When the first voltage V1 is equal to or higher than the second threshold Th2 that is higher than the first threshold when the state of the switching signal SS is on, the control means 5 performs control to turn on the direction indicator lamp 11. It is determined that an excessive current is flowing in the direction indicator lamp 11 and it is determined that the direction indicator lamp 11 is short-circuited. When the control means 5 determines that the direction indicator lamp 11 is short-circuited, the control signal 5 switches the switching signal SS to a periodic signal described later in order to prevent the high-side driver 2 from generating heat. When determining that the direction indicator lamp 11 is short-circuited, the control means 5 notifies that the direction indicator lamp 11 has been short-circuited by a not-shown notification means. Further, the control means 5 displays the state of the direction indicating switch SW by turning on (or blinking) and turning off by the direction indicating lamp 10 even while determining that the direction indicating lamp 11 is short-circuited.

FIG. 2 shows changes in the switching signal SS at the time of short-circuit determination and short-circuit elimination. LS in FIG. 2 indicates the result of the control means 5 determining the state of the direction indicator lamp 11, On indicates normal lighting, Short indicates short circuit, and Off indicates normal light extinction. is there.
When the control means 5 determines that the direction indicator lamp 11 is short-circuited as shown at time T1 in FIG. 2, it is determined that the direction indicator lamp 11 is short-circuited as shown at time T2 in FIG. The switching signal SS is switched to the periodic signal shown in FIG. The periodic signal is a periodic signal Cy in which a signal that is turned off during the first time P1 and a signal that is turned on during the second time P2 shorter than the first time P1 are one cycle. One voltage V1 is used to determine the state of the direction indicator lamp 11. The first time P1 is set to 1 to 60 seconds, for example, and the longer the first time P1, the lower the possibility that the high side driver 2 will generate heat, thereby saving power. The second time P2 is set to, for example, 100 to 200 milliseconds as the time until the first voltage V1 output from the high side driver 2 is stabilized.
The control means 5 periodically determines the state of the direction indicator lamp 11 after determining that the direction indicator lamp 11 is short-circuited, and the direction indicator lamp 11 is normally lit as shown at time T2 in FIG. If it is determined that the short circuit has been resolved, the output of the periodic signal is stopped, and the switching signal SS is switched to display the operating state of the direction indicator.

(Judgment of normal lighting)
When the first voltage V1 is greater than or equal to the first threshold Th1 and less than the second threshold Th2 when the state of the switching signal SS is on, the control means 5 indicates the state and direction indication of the switching signal SS. It is determined that the direction indicator lamps 11 are normally lit by estimating that both of the lamps 11 are in a state in which the direction indicator lamps 11 are turned on. The control means 5 lights (or blinks) the direction indicator lamp 10 to display that the direction indicator switch SW is on.

(Judgment of normal light off)
When the first voltage V1 is less than the first threshold Th1 when the state of the switching signal SS is OFF, the control means 5 is both the direction indicating lamp when the state of the switching signal SS and the state of the direction indicator lamp 11 are both. Therefore, it is determined that the turn signal lamp 11 is normally turned off. The control means 5 turns off the direction indicator lamp 10 and displays that the direction indicator switch SW is off.

  As described above, the control unit 5 determines the state of the direction indicator lamp 11 by monitoring the first current A <b> 1 flowing from the first voltage V <b> 1 input from the high side driver 2 to the direction indicator lamp 11. However, the high-side driver 2 has a first characteristic depending on a point that a conversion characteristic for conversion from the first current A1 to the first voltage V1 changes depending on a use environment temperature, or a voltage (second voltage) of a power source supplied to the high-side driver 2. Since the current A1 changes, the state of the direction indicator lamp 11 may be erroneously determined unless these are taken into consideration.

  Therefore, the control means 5 performs the following correction on the first voltage V1.

(First correction)
The control means 5 stores in advance a correction value (first correction value) of the first voltage V1 corresponding to the conversion characteristic changing from the first current A1 to the first voltage V1 in the operating temperature range of the high-side driver 2 as a conversion table. To remember.
The control unit 5 refers to the first correction value corresponding to the temperature of the high-side driver 2 input from the temperature detection unit 4 from the conversion table stored in the memory, and the first correction value input from the high-side driver 2. The voltage V1 is corrected.

(Second correction)
The control means 5 stores in the memory correction values (second correction values) of predetermined threshold values (first threshold value and second threshold value) in the maximum voltage and minimum voltage in the operating voltage range of the high-side driver 2 measured in advance. Remember.
The control means 5 performs a predetermined interpolation on the second correction value corresponding to the second voltage estimated from the third voltage inputted by the voltage drop from the second correction value at the maximum voltage and the minimum voltage stored in the memory. Each of the predetermined threshold values (first threshold value, second threshold value) is corrected by the correction value calculated by this interpolation method. As the interpolation method, various interpolation methods such as spline interpolation and Lagrange interpolation may be appropriately determined regardless of interpolation / extrapolation.

As described above, the vehicle display apparatus M according to the embodiment of the present invention outputs the first current A1 to the winker lamp 11 that displays the operating state of the direction indicator, and is proportional to the first current A1. The driving means 2 for outputting the first voltage V1, the switching signal SS for turning on / off the output of the first current A1 to the driving means 2, and the winker lamp based on the state of the switching signal SS and the first voltage V1. And a control device 5 for determining the state of the direction indicator lamp, and when the control device 5 determines that the blinker lamp 11 is short-circuited when the switching signal SS is turned on, switching is performed. The output of the signal SS is switched to the periodic signal Cy which is turned off at the first time P1 and turned on at the second time P2 shorter than the first time P1.
According to this, it is possible to provide a direction indicator lamp control unit that monitors a short-circuit state while suppressing heat generation of the drive unit that drives the direction indicator lamp.

  The present invention is not limited to the above embodiments (including the contents of the drawings). Modifications (including deletion of constituent elements) can be added to the above-described embodiment within the scope of the gist of the present invention.

  For example, the vehicle display device M according to an embodiment of the present invention displays the state of the direction indicating switch SW, but is not limited to this, and the vehicle display device M is not limited to the vehicle network such as a CAN (controller area network) and various switches and sensors. The vehicle information such as the traveling speed and the engine speed may be input, and the vehicle information may be displayed on the liquid crystal display device.

  For example, the first correction value for performing the first correction is for correcting the first voltage V1, but a predetermined threshold value compared with the first voltage V1 may be corrected. Similarly, the second correction value for performing the second correction corrects the predetermined threshold value, but the first voltage V1 compared with the predetermined threshold value may be corrected.

  In the first correction, a plurality of correction values are stored in a memory as a conversion table, and the corresponding correction values are referred to. In the second complement, a plurality of correction values are stored in the memory to cope with the correction. Although the correction value to be calculated is calculated by the interpolation method, it may be obtained by combining them.

  Further, the control means 5 stores in advance a conversion characteristic table for converting the first current A1 in the operating temperature range of the high side 2 into the first voltage V1, and uses the conversion characteristic table to convert the first voltage V1 to the first voltage V1. You may comprise so that the state of the direction indicator lamp 11 may be determined by estimating 1 electric current A1. In this case, the state of the direction indicator lamp 11 can be estimated by comparing the estimated first current A1 with a predetermined threshold corresponding to the first current A1.

  The temperature detecting means 4 is preferably arranged around the high side driver 2, but is not limited to this, and detects the ambient temperature in the case body of the vehicle display device M, and the high side driver is detected from this ambient temperature. You may comprise so that the temperature of 2 may be estimated.

M: Display device for vehicle (control device for direction indicator light)
10: Direction indicator lamp (indicator lamp)
11: Direction indicator (blinker lamp)
2: High-side driver (drive means)
3: constant voltage circuit 4: temperature detection means 5: control means B: battery A1: first current V1: first voltage SS: switching signal SW: direction indicating switch P1: first time P2: second time Cy: periodic signal Cy

Claims (2)

A blinker lamp that displays the operating status of the direction indicator,
Driving means for outputting a first current to the blinker lamp and outputting a first voltage proportional to the first current;
Control means for outputting a switching signal for turning on / off the output of the first current to the driving means and determining the state of the blinker lamp based on the state of the switching signal and the first voltage. A direction indicator light control device,
If it is determined that the blinker lamp is short-circuited while the switching signal is turned on, the control means turns off the output of the switching signal for a first time and for a second time shorter than the first time. A control device for a direction indicator lamp, characterized by switching to a periodic signal. 2. The direction indicator lamp according to claim 1, wherein the control unit stops outputting the periodic signal when it is determined that the blinker lamp is short-circuited while outputting the periodic signal. 3. Control device.

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