JPH0717322A - Illuminating angle positioning device of headlamp for vehicle - Google Patents

Abstract

PURPOSE:To secure safety when an abnormal condition occurs in a signal responding to the preset illuminating angle position. CONSTITUTION:A setting device 1, a right headlamp driving unit 2, and a left headlamp driving unit 3 are constructed as shown in a figure. When a line L1 is broken during an adjusting operation of an illuminating angle position, a voltage VSpR of a point P1R is abnormally increased in the driving unit 2, and an output of CP3R is turned to (L), Q5R is turned on, a comparison output is turned to (H) according to the increase of non-reversed input voltage of CP2R. In this way, the illuminating angle position of the right headlamp is fixed in the lowermost position. On the other hand, a voltage V1 of a point P0 is abnormally reduced in the setting device 1. Therefore, a voltage VSpL of a point P1L in the driving unit 3 is abnormally increased, and the illuminating angle position of the left headlamp is fixed in the lowermost position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle headlamp suitable for use in remotely adjusting the irradiation angle position of a headlamp held so as to be tiltable with respect to a vehicle body from the driver's seat side. Of the irradiation angle position adjusting device.

[0002]

2. Description of the Related Art In a vehicle, particularly an automobile, a large load is applied to the front wheel side or the rear wheel side of the vehicle body because the vehicle body and the axle are connected by a suspension device composed of leaf springs, coil springs and the like. , The body posture is in the state of front sinking or rear sinking, which changes the vertical irradiation angle of the headlight with respect to the road surface and impairs driving safety, and rear sinking causes the headlight to rise upward. If this happens, there is a danger that the driver of the oncoming vehicle will be significantly dazzled. In order to correct such a change in the irradiation angle of the headlight with respect to the road surface, the headlight is held so as to be tiltable with respect to the vehicle body, and the irradiation angle position of the headlight is set to be remote from the driver's seat side. There have been proposed various irradiation angle position adjusting devices configured to be adjustable by operation. For example, an irradiation angle position setter is provided on the driver's seat side, and a signal corresponding to the set irradiation angle position is sent from the irradiation angle position setter to the right headlight drive unit and the left headlight drive unit via the right side line and the left side line. The right headlight drive unit and the left headlight drive unit are operated to move the irradiation angle positions of the right headlight and the left headlight to match the set irradiation angle position.

[0003]

However, according to such a conventional irradiation angle position adjusting device, when the right side line (left side line) is disconnected or short-circuited with the power supply line, the right headlamp drive unit (left headlamp drive unit). The operation of adjusting the irradiation angle position by the unit) may be significantly disturbed, and the irradiation angle position of the right headlight (left headlight) may be unintentionally fixed to the highest position. In this case, the oncoming vehicle is dazzled, and the left and right irradiation angle positions are unbalanced, which impairs safety.

The present invention has been made in order to solve such a problem, and an object of the present invention is to irradiate an object without sacrificing safety even if an error occurs in a signal corresponding to a set irradiation angle position. An object is to provide an angular position adjusting device.

[0005]

In order to achieve such an object, the present invention provides an irradiation angle position setting means and a signal corresponding to the irradiation angle position set via the irradiation angle position setting means. In an irradiation angle position adjusting device having an input and an irradiation angle position adjusting means for adjusting the irradiation angle positions of the first and second headlamps based on this signal, when an abnormality occurs in the signal, It is provided with means for fixing both the irradiation angle positions of the first and second headlamps to the lowest position.

[0006]

Therefore, according to the present invention, when an abnormality occurs in the signal corresponding to the set irradiation angle position, the irradiation angle positions of the first and second headlamps are both fixed to the lowest position.

[0007]

EXAMPLES The present invention will now be described in detail based on examples. FIG. 1 is a circuit configuration diagram of an irradiation angle position adjusting device showing an embodiment of the present invention. In the figure, 1 is an irradiation angle position setting device arranged on the driver's side, 2 is a right headlight drive unit attached to a right headlight (not shown) held tiltably with respect to the vehicle body, 3 Is a left headlight drive unit attached to a left headlight (not shown).

The irradiation angle position setter 1 comprises a variable resistor RV.
1, resistors Ra and Rb, a PNP transistor Q1,
NPN transistors Q2 and Q3, resistors R1 to R4,
It has a Zener diode ZD1 and a diode D1. In addition, the right headlamp drive unit 2 has a resistor R5 _R
~R22 and _R, a variable resistor RV2 _R, and the Zener diode ZD2 _R ~ZD4 _R, NPN transistor Q
4 _R , PNP transistor Q5 _R , and comparator CP
1 _{R to} CP4 _R , motor driver MD _R , and motor M
_{With R} and. The left headlight drive unit 3 has a resistance R
And 5 _L ~R22 _L, a variable resistor RV2 _L, zener diode ZD2 _L ~ZD4 _L, NPN transistors Q
4 _L , PNP transistor Q5 _L , and comparator CP
And 1 _L ~CP4 _L, and a motor driver MD _L, the motor M
_{With L} and.

In the right headlight drive unit 2, the resistance R
6 _R and R7 _R have the same resistance value, and the resistance R6 _R
And R7 _R are connected in series, one end of the resistor R6 _R is connected to the connection point P1 _R between the resistor R5 _R and the collector of the transistor Q2, and the other end of the resistor R7 _R is connected to the variable resistor RV.
It is connected to the divided voltage extraction point P2 _R of 2 _R. Variable resistor RV2 voltage Vpv _R generated divided voltage drawing point P2 _R of _R is changed according to the rotational angular position of the motor M _R. Further, the forward rotation of the motor M _R raises the irradiation angle position of the right headlight, and the reverse rotation thereof lowers it.

When the voltage between the anode and cathode of the Zener diode ZD4 _R is Vz _R , the resistance R8 _R
~R11 been divided by _R, the comparator CP1 inverting input to the _{[(Vz R / 2) + α} (α ≒ 0) ] of the _R becomes the comparison reference voltage is applied, to the non-inverting input of the comparator CP2 _R [(Vz _R / 2) -α]. In a state where the setting irradiation angle position of the actual irradiation angle position and the irradiation angle locator 1 right headlamp meets, P1 voltage point _R Vsp _R and P
The balance between the voltage Vpv _R of 2 _R point, the resistor R6 _R
The voltage Vo _R generated at the connection point P3 _R between R7 _R and R7 _R is [(V
z _R / 2) -α] <it is within the range of Vo _R <[(Vz _R / 2) + α].

[0011] In addition, the voltage Vsp _R generated at the connection point P1 _R
Is also applied to the inverting inputs of the comparators CP3 _R and CP4 _R , and the comparators CP3 _R and CP4 _R
Zener diodes ZD2 _R and Z to the non-inverting input of
Predetermined voltages Va _R and Vb _R determined by D3 _R are set as comparison reference voltages. Here, the comparison reference voltage Va _R is set to be slightly lower than the power supply voltage,
The comparison reference voltage Vb _R is set to be slightly higher than the ground voltage.

A series connection circuit of resistors R16 _R and R17 _R is connected between the output of the comparator CP3 _R and the power supply line, and the base of the transistor Q5 _{R is} connected to the connection point of the resistors R17 _R and R16 _R. Are connected.
The emitter of the transistor Q5 _R is connected to the power supply line, and the collector is connected to the resistor R12 _R via the resistor R12 R.
It is connected to the connection point of 8 _R and R 9 _R. Further, a resistor R1 is provided between the output of the comparator CP4 _R and the ground line.
9 _R and R20 connected in series circuit between the _R are connected, resistor R19 _R and transistor Q4 to a connection point between R20 _{R R}
The base of is connected. The emitter of the transistor Q4 _R is connected to the ground line, and the collector is connected to the connection point between the resistors R9 _R and R10 _R via the resistor R13 _R.

The left headlight drive unit 3 is also connected with the same circuit as the right headlight drive unit 2, and the respective parts of the left headlight drive unit 3 are designated by the reference numerals corresponding to those of the right headlight drive unit 2. Therefore, the description here is omitted.

Next, the basic operation of the irradiation angle position adjusting device configured as described above will be described on behalf of the right headlight. Now, it is assumed that the actual irradiation angle position of the right headlight and the irradiation angle position set by the irradiation angle position setting device 1 match. In this case, the right headlamp drive unit 2, the voltage Vo _R generated in the connection point P3 _R [(Vz _R /
2) -α] <Vo _R <[(Vz _R / 2) + α], so that the comparators CP1 _R and C
The comparison output of P2 _R maintains the "L" level state.
Therefore, "DI1", "DI" of the motor driver MD _R
2 ”inputs are both set to“ L ”level, and motor M _R
Keeps stopped.

When the irradiation angle position setting device 1 is operated from such a state and the extraction point (setting irradiation angle position) of the divided voltage from the variable resistor RV1 is changed, that is, between the base and emitter of the transistor Q1. When the voltage V _BE1 is changed, a constant base current I _B1 corresponding to the voltage V _BE1 between the base and emitter flows. As a result, a collector current that is h _FE times the base current I _B1 flows through the transistor Q1, turns on the transistors Q2 and Q3, and connects the resistor R3 connected to the emitters of the transistors Q2 and Q3.
And control the voltage drop across R4 constant. This voltage drop does not change even if the power supply voltage to the irradiation angle position setter 1 changes. That is, in the irradiation angle position setter 1,
The constant currents I _c1 and I _c2 that do not depend on the power supply voltage to the irradiation angle position setting device 1 and are determined only by the set irradiation angle position flow in.

Current I _c1 flowing into the irradiation angle position setter 1
Therefore, the connection point P1 _R in the right headlight drive unit 2 is
Of the voltage Vsp _R changes. Further, due to the current I _c2 flowing into the irradiation angle position setter 1, the left headlight drive unit 3
The voltage Vsp _{L at the} connection point P1 _L changes at.

Here, assuming that the setting irradiation angle position in the irradiation angle position setting device 1 is changed in the down direction, the output current I _c1 (I _c2 ) from the irradiation angle position setting device 1 is changed.
Becomes larger, the voltage Vs at the connection point P1 _R (P1 _L ) becomes
p _R (Vsp _L ) decreases, and the connection point P3 _R
The voltage Vo _R (Vo _L ) generated at (P3 _L ) also decreases.
Vo _R (Vo _L ) decreases and [(Vz _R / 2) -α]
([(Vz _L / 2) -α]) When the value is set to the following irradiation angle position, the comparator CP2 _R (CP
Comparison output 2 _L) becomes "H" level, "DI2" input of the motor driver MD _R (MD _L) becomes the "H" level, the motor M _R (M _L) is reversely rotated, the right headlamp The irradiation angle position of starts to go down.

When the motor M rotates in the reverse direction, the variable resistor RV
2 _R (RV2 _L ) divided voltage extraction point P2 _R (P
The voltage Vpv _R (Vpv _L ) generated at 2 _L ) rises, and the voltage Vo _R generated at the connection point P3 _R (P3 _L ) accordingly.
(Vo _L ) begins to rise. And Vo _R becomes [(Vz
_R / 2) −α] or more (Vo _L becomes [(Vz _L /
2) -α]) or more), the comparator CP2
Returning comparison output _R (CP2 _L) is to the "L" level, the motor M _R (M _L) is stopped. As a result, the irradiation angle position of the right headlight (left headlight) matches the changed setting irradiation angle position in the irradiation angle position setting device 1.

When the setting of the irradiation angle position set by the irradiation angle position setter 1 is changed to the up direction, the currents I _c1 and I _c2 flowing into the irradiation angle position setter 1 become small, so that the connection point P1 _R (P1 _L ) voltage Vsp _R (Vs
p _L ) rises, the comparison output of the comparator CP1 _R (CP1 _L ) becomes the “H” level, the operation opposite to the above is performed, and the irradiation angle position of the right headlight (left headlight) is irradiated. It matches the set irradiation angle position after being changed by the angle position setting device 1.

In the irradiation angle position adjusting device for performing such a basic operation, the current I _c1 is adjusted during the irradiation angle position adjusting operation.
It is assumed that the line L1 through which the current flows is disconnected (or shorted with the power supply line). In this case, the right headlight drive unit 2
The voltage Vsp _{R at the} connection point P1 _R at abnormally rises, and the output of the comparator CP3 _R becomes “L” level. As a result, the transistor Q5 _R turns on and the resistor R12
_{Since R} is connected in parallel to the resistor 8 _R , the comparison reference voltage set to the inverting input of the comparator CP1 _R rises. Further, the comparison reference voltage set to the non-inverting input of the comparator CP2 _R also rises. At this time, the voltage VO _R also increases resulting in the connection point P3 _R, comparison reference voltages set to the non-inverting input of the comparator CP2 _R is the set resistor R12 and _R as appropriate value, after the rise It becomes a predetermined value VU _R higher than the voltage VO _R.

Therefore, the comparison output of the comparator CP1 _R becomes "L" level, the comparison output of the comparator CP2 _R becomes "H" level, and the "DI" of the motor driver MD _R becomes "DI".
The "1" and "DI2" inputs become "L" and "H" levels, the motor M _R (M _L ) rotates in the reverse direction, and the irradiation angle position of the right headlamp starts to go down.

When the motor M rotates in the reverse direction, Vpv _R rises, and accordingly Vo _R rises. When Vo _R becomes VU _R or more, the comparison output of the comparator CP2 _R becomes "L" level, The motor M _R stops. In this case, VU _R set as an appropriate value, that is, resistance R
With the value of 12 _R , the irradiation angle position of the right headlamp is fixed to the lowest position.

On the other hand, when the line L1 is disconnected (or shorted to the power supply line), the voltage V1 at the connection point P0 abnormally drops due to the current flowing between the base and emitter of the transistor Q2 to the resistor R3 (R3 << R2). As a result, the base current flowing through the transistor Q3 decreases, the current I _c2 decreases, and the voltage Vsp _{L at the} connection point P1 _L in the left headlight drive unit 3 increases abnormally. As a result, the output of the comparator CP3 _L becomes “L” level, the transistor Q5 _L turns on, and the resistor R12
_{Since L} is connected in parallel with the resistor 8 _L , the inverting input of the comparator CP1 _L and the comparator CP2 _L
Of the comparator CP1 _L and CP2 _L becomes “L” level and “H” level, and the right headlamp drive unit 2
The irradiation angle position of the left headlight is fixed to the lowest position in the same manner as in the above.

On the other hand, it is assumed that the line L1 is short-circuited with the ground line during the operation of adjusting the irradiation angle position.
In this case, the connection point P1 in the right headlight drive unit 2
Voltage Vsp _R of _R is reduced abnormally, the comparator CP4 _R
Output becomes "H" level, and the transistor Q4 _R is turned on. As a result, the resistor R13 _R becomes the resistors 10 _R and R.
It is connected in parallel to the series connection circuit with 11 _R, and the comparison reference voltage set to the non-inverting input of the comparator CP2 _R drops. At this time, the voltage VO _R generated at the connection point P3 _R also drops, but the comparison reference voltage set to the non-inverting input of the comparator CP2 _R is reduced by the resistor R13 _R set as an appropriate value. a higher predetermined value VD _R than the voltage VO _R.

Therefore, the comparison output of the comparator CP1 _R becomes "L" level, the comparison output of the comparator CP2 _R becomes "H" level, and the "DI" of the motor driver MD _R becomes "DI".
The "1" and "DI2" inputs become "L" and "H" levels, the motor M _R rotates in the reverse direction, and the irradiation angle position of the right headlight begins to go down.

[0026] When the motor M _R is reversely rotated, Vpv _R increases, Vo _R is increased with this, when Vo _R is greater than or equal to VD _R, the comparison output of the comparator CP2 _R is "L"
The level becomes a level and the motor M _R stops. In this case, the VD _R that is set as an appropriate value, namely the value of the resistor R13 _R, irradiation angle position of the right headlamp is fixed in the lowest position.

On the other hand, when the line L1 is short-circuited with the ground line, a current flows between the base and collector of the transistor Q2, and the voltage V1 at the connection point P0 abnormally drops. As a result, the transistor Q3 is turned off, and the voltage Vsp _{L at the} connection point P1 _L in the left headlight drive unit 3 rises abnormally. As a result, the output of the comparator CP3 _L becomes “L” level, the transistor Q5 _L is turned on, the resistor R12 _L is connected in parallel with the resistor 8 _L , and the inverting input of the comparator CP1 _L and the comparator CP2 _{L are obtained.} The comparison reference voltage set to the non-inverted input of (3) rises, and the irradiation angle position of the left headlight is fixed to the lowest position in the same manner as described above.

During the operation of adjusting the irradiation angle position, the current I
_When the line L2 through which _c2 flows is disconnected (or shorted with the power supply line) or shorted with the ground line, the right headlight drive unit 2 and the left headlight drive unit 3
Thus, the operation opposite to the above is performed, and the irradiation angle positions of the left and right headlamps are both fixed to the lowest position.

FIG. 2 shows the voltage Vs at the connection point P1 _R (P1 _L ).
The relationship between p _R (Vsp _L ) and the irradiation angle position (actuator position) of the right headlight (left headlight) is shown. Vsp
_R (VspL) is a value corresponding to the initial position (switch initial position) in the irradiation angle position setter Vsp _RU (Vs
p _LU ) to the value Vsp corresponding to the switch lowermost position
If it is within the range of _RD (Vsp _LD ), the irradiation angle position of the right headlight (left headlight) is adjusted within the range of the initial position to the lowest position with Pa point as the fulcrum. On the other hand, V
Input voltage Vsp when sp _R (Vsp _L ) is broken (or shorted to the power supply line) in line L1 (L2)
_{When Rmax} (Vsp _Lmax ) is reached, the point Pb serves as a fulcrum, and the irradiation angle position of the right headlight (left headlight) is fixed to the lowest position. If Vsp _R (Vsp _L ) becomes the input voltage Vsp _Rmin (Vsp _Lmin ) when the line L1 (L2) is short-circuited with the ground line, the point Pc serves as a fulcrum and the right headlamp (left headlamp) irradiates. The angular position is fixed at the lowest position.

The resistors R12 _R (R12 _L ) and R
By selecting the value of 13 _R (R13 _L ) appropriately,
As shown in FIG. 3, when the lines L1 and L2 are broken or short-circuited, the irradiation angle positions of the right headlight and the left headlight can be fixed to the intermediate position.

[0031]

As is apparent from the above description, according to the present invention, when an abnormality occurs in the signal corresponding to the set irradiation angle position, the irradiation angle positions of the first and second headlamps are both changed. Since it is fixed at the lowest position, oncoming vehicles will not be dazzled and the irradiation angle positions of the first and second headlights will not be unbalanced, ensuring safety. You will be able to.

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram of an irradiation angle value adjusting device showing an embodiment of the present invention.

FIG. 2 is a diagram showing a relationship between an input signal voltage to a right lamp drive unit (left lamp drive unit) and an irradiation angle position of a right headlight (left headlight).

FIG. 3 is a diagram showing a relationship between an input signal voltage to a right lamp driving unit (left lamp driving unit) and an irradiation angle position of a right headlight (left headlight) when stopping at an intermediate position.

[Explanation of symbols]

1 irradiation angle locator RV1 variable resistor Q1 PNP transistor Q2 NPN transistors Q3 NPN transistor 2 right headlamp driving unit RV2 _R variable resistor Q4 _R NPN transistor Q5 _R PNP transistor M _R motor R5 _R ~R22 _R resistors CP1 _R ~ CP4 _R comparator MD _R motor driver 3 left headlight driving unit RV2 _L variable resistor Q4 _L NPN transistor Q5 _L PNP transistor M _L motor R5 _L ~R22 _L resistors CP1 _L ~CP4 _L comparator MD _L motor driver

Claims (1)

[Claims] 1. An irradiation angle position setting means and a signal corresponding to the irradiation angle position set via the irradiation angle position setting means are input, and based on this signal, the first and second headlamps An irradiation angle position adjusting device for a vehicle headlamp, comprising: an irradiation angle position adjusting means for adjusting an irradiation angle position; and when an abnormality occurs in the signal, the irradiation angles of the first and second headlamps. An irradiation angle position adjusting device for a vehicle headlamp, comprising means for fixing both positions to the lowest position.