JP2863972B2 - Vehicle headlight irradiation angle position adjustment device - Google Patents

Abstract

PURPOSE:To fix an illuminating angle position of right and left headlamps in the same position as it is without providing any special signal line, when an abnormal condition occurs to at least one of signals from an illuminating angle position setting device. CONSTITUTION:A setting device 1-1, right and left headlamp driving units 2-1, 3-1 are constructed as shown in a figure. When a line L1 is broken during an adjusting operation of an illuminating angle position, a P1R point voltage VSpR in the driving unit 2-1 is abnormally increased, and an output of CP1R becomes (L), and then, a motor MR is stopped. On the other hand, a voltage V1 in a point PO is abnormally reduced. In this way, a voltage VSpL of a point P1L is abnormally increased, and an output of CP1L becomes (L), so that a motor ML is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art In a vehicle, especially an automobile, a large load is applied to a front wheel side or a rear wheel side of a vehicle body because a vehicle body and an axle are connected by a suspension device composed of a leaf spring, a coil spring or the like. The attitude of the vehicle body will be in the forward sunken or sunken state, which will change the vertical illumination angle of the headlamp with respect to the road surface and impair driving safety. 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 remotely controlled from the driver's seat side. Various irradiation angle position adjusting devices configured to be adjustable by operation have been proposed. For example, an irradiation angle position setting device is provided on the driver's seat side, and a signal corresponding to an irradiation angle position set for the right headlight and the left headlight from the irradiation angle position setting device is transmitted via the right line and the left line. Send to the right headlight drive unit and the left headlight drive unit,
The right headlight drive unit and the left headlight drive unit are operated to match the irradiation angle positions of the right headlight and the left headlight with the set irradiation angle positions.

[0003]

However, according to such a conventional irradiation angle position adjusting device, when the right line (left line) is disconnected or short-circuited, the right headlight drive unit (left headlight drive unit) is used. The adjustment operation of the irradiation angle position due to is greatly disturbed. To prevent this,
In the right headlight drive unit and the left headlight drive unit, detect the abnormality of the signal from the irradiation angle position setting device,
It is conceivable to stop the irradiation angle positions of the right and left headlights on the spot. However, when such a method is adopted, for example, when the right line is disconnected or short-circuited, the irradiation angle position of the right headlight stops immediately, but the irradiation angle position of the left headlight does not stop. The irradiation angle positions of the left and right headlights become unbalanced, and a sufficient lighting effect cannot be obtained. In addition, the abnormality detection result of the signal in the right headlight drive unit (left headlight drive unit) is sent to the left headlight drive unit (right headlight drive unit),
It is also conceivable to stop the irradiation angle position of the left headlight (right headlight) on the spot. However, in this case, a signal line for sending the abnormality detection result from the right headlight drive unit (left headlight drive unit) to the left headlight drive unit (right headlight drive unit) is required.

The present invention has been made to solve such a problem, and an object of the present invention is to provide a method for transmitting a signal from an irradiation angle position setting device without providing a special signal line for transmitting an abnormality detection result. It is an object of the present invention to provide an irradiation angle position adjusting device that can fix the irradiation angle positions of the left and right headlights at the same position when an abnormality occurs in any one of them, and can obtain a sufficient lighting effect. .

[0005]

In order to achieve the above object, the present invention provides an irradiation angle position setting means for outputting first and second signals corresponding to a set irradiation angle position, A first signal output from the position setting means is input, and first irradiation angle position adjusting means for adjusting the irradiation angle position of the first headlight based on this signal, and output from the irradiation angle position setting means. A second irradiation angle position adjusting means for inputting a second signal and adjusting an irradiation angle position of a second headlight based on the signal; and detecting an abnormality in the first signal when the first signal is abnormal. The first abnormality detecting means for stopping the operation of the first irradiation angle position adjusting means and, when an abnormality occurs in the second signal, detecting the abnormality and controlling the operation of the second irradiation angle position adjusting means. A second abnormality detecting means for stopping, and an abnormality detecting means for detecting an abnormality in the first signal. The the abnormal second signal, when an abnormality occurs in the second signal is obtained by a means for the abnormal first signal.

[0006]

Therefore, according to the present invention, when an abnormality occurs in the first signal output from the irradiation angle position setting means, this is detected by the first abnormality detection means and the irradiation angle position of the first headlight is detected. Is fixed in place, while the second signal output from the irradiation angle position setting means is determined to be abnormal, and this is detected by the second abnormality detection means, and the irradiation angle position of the second headlight is determined. Fixed in place. Conversely, when an abnormality occurs in the second signal output from the irradiation angle position setting means, the abnormality is detected by the second abnormality detection means, and the second abnormality is detected.
The irradiation angle position of the headlight is fixed in place, while the first signal output from the irradiation angle position setting means is determined to be abnormal, and this is detected by the first abnormality detection means, and the first signal is detected.
The irradiation angle position of the headlight is fixed in place.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on embodiments. [Embodiment 1] FIG. 1 is a circuit diagram of an irradiation angle position adjusting apparatus showing an embodiment of the present invention. In FIG.
1 is an irradiation angle position setting device arranged on the driver's seat side, and 2-1.
Is a right headlight drive unit attached to a right headlight (not shown) held to be tiltable with respect to the vehicle body, and 3-1 is a left headlight drive unit attached to a left headlight (not shown) It is.

The irradiation angle position setting device 1-1 includes a variable resistor RV1, resistors Ra and Rb, and a PNP transistor Q1.
, NPN transistors Q2 and Q3, and resistors R1 to R4
, A Zener diode ZD1 and a diode D1. Also, the right headlamp drive unit 2-1 includes a resistor R5 _R ~R17 _R, a variable resistor RV2 _R, and the Zener diode ZD2 _R, and diode D2 _R, a comparator CP1 _R ~CP4 _R, motor driver 2 11
And a motor M _R. Left headlight driving unit 3-1, a resistor R5 _L ~R17 _L, the variable resistor RV2
_L , Zener diode ZD2 _L , and diode D2
And _L, a comparator CP1 _L ~CP4 _L, a motor driver 3-11, comprising a motor M _L.

[0009] In the right headlamp driving unit 2-1 are the same resistance value as the resistor R6 _R and R7 _R, resistor R
6 terms of the _R and R7 _R are connected in series, the resistor R6 one end of _R is connected to the connection point P1 _R and the collector resistor R5 _R and the transistor Q2, the resistor R7 and the other end of _R is the variable resistor RV2 _R the divided voltage is connected to the extraction point P2 _R of. 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. The irradiation angle position of the right headlight by the forward rotation of the motor M _R is up, down by the reverse rotation.

Further, when the voltage between the anode the cathode of the Zener diode ZD2 _R and Vz _R, resistor R8 _R
Is divided by R12 _R, to the non-inverting input of the comparator CP2 _{R [(Vz R / 2) + α} (α ≒ 0) ] becomes the comparison reference voltage is applied, the comparator CP3 _R inverting the input [(Vz _R of / 2) -α]. Further, when the actual irradiation angle position of the right headlight matches the irradiation angle position set by the irradiation angle position setting device 1-1, the voltage Vsp _{R at the} point P1 _R is set.
The balance between the voltage Vpv _R of the P2 _R point, the resistor R
6 _R and R7 voltage Vo _R caused to the connection point P3 _R and _R is [(Vz _R / 2) -α] <Vo _R <[(Vz _R / 2) +
α].

The voltage Vo _R generated at the node P3 _R is applied to the inverting and non-inverting inputs of the comparators CP2 _R and CP3 _R. Also, the voltage V generated at the connection point P1 _R
sp _R is applied to the inverting and non-inverting inputs of comparators CP1 _R and CP4 _R. Comparator CP1
Predetermined reference voltages Va _R and Vb _R are applied to the non-inverting input and the inverting input of _R and CP4 _R.

The left headlight drive unit 3-1 has the same circuit connection as the right headlight drive unit 2-1, and each part of the left headlight drive unit 3-1 is connected to the right headlight drive unit 2. The description here is omitted by showing the reference numerals corresponding to -1.

Next, the basic operation of the irradiation angle position adjusting device having the above-described configuration will be described with reference to the right headlight side. Now, it is assumed that the actual irradiation angle position of the right headlamp matches the irradiation angle position set by the irradiation angle position setting device 1-1. In this case, resistor R6 _R and R7 voltage on the connection point P3 _R and _R Vo _R is [(Vz _R / 2) -α]
<Since it is within the range of Vo _R <[(Vz _R / 2) + α], comparators CP1 _R, CP2 _R, CP3
The comparison outputs of _R and CP4 _R maintain the "H" level state. For this reason, “DI” of the motor driver 2-11
Inputs of "1", "DI2", and "ST bar" are all at "H" level, and the motor M _R maintains the stopped state.

In such a state, when the irradiation angle position setting device 1-1 is operated to change the point at which the divided voltage is taken out from the variable resistor RV1 (set irradiation angle position), that is, the base-emitter of the transistor Q1 is changed. varying the voltage V _BE1 between, constant base current I _B1 which corresponds to the voltage V _BE1 between the base emitter flows. As a result, a collector current of h _FE times the base current I _B1 flows through the transistor Q1, turning on the transistors Q2 and Q3, and reducing the voltage drop across the resistors R3 and R4 connected to the emitters of the transistors Q2 and Q3. Control to constant. This voltage drop does not change even if the power supply voltage to the irradiation angle position setting device 1-1 changes. That is, the constant currents _Ic1 and _Ic2 determined only by the set irradiation angle position flow into the irradiation angle position setting device 1-1 without depending on the power supply voltage to the irradiation angle position setting device 1-1.

[0015] The current I _c1 flowing to the irradiation angle locator 1-1, the voltage Vsp _R at the connection point P1 _R in the right headlamp driving unit 2-1 changes. Further, the voltage Vsp _{L at the} connection point P1 _L in the left headlight drive unit 3-1 is determined by the current I _c2 flowing into the irradiation angle position setting device 1-1.
Changes.

Here, assuming that the irradiation angle position set by the irradiation angle position setting device 1-1 is changed in the down direction, the output current I from the irradiation angle position setting device 1-1 is changed.
_{Since c1} ( _Ic2 ) becomes small, the connection point P1 _R (P1 _L )
Decrease of the voltage Vsp _R (Vsp _L) is, the voltage Vo _R (Vo _L) also decreases occurring in the connection point P3 _R Accompanying this (P3 _L). Voltage Vo _R generated at connection point P3 _R (P3 _L )
(Vo _L ) decreases and [(Vz _R / 2) -α]
When ([(Vz _L / 2) -α]) is a value corresponding to the following settings irradiation angle position, the comparator CP3 _R (CP
3 comparison output _L) becomes the "L" level, "DI2" input of the motor driver 2-11 (3-11) becomes the "L" level, and the reverse rotation motor M _R (M _L) is, right front The illumination angle position of the lamp starts to decrease.

When the motor M rotates in the reverse direction, the variable resistor RV
2 _R (RV2 _L) divided voltage drawing point from P2 _R (P
2 _L ), the voltage Vpv _R (Vpv _L ) rises, and accordingly, the voltage Vo _R generated at the connection point P3 _R (P3 _L ).
(Vo _L ) starts to rise. Then, the connection point P3 _R (P
3 voltage on _L) Vo _R (Vo _L) is [(Vz _R /
2) −α] ([(Vz _L / 2) −α])
Comparing the output of the comparator CP3 _R (CP3 _L) is "H"
Return to the level, and the motor M _R (M _L ) stops. Thus, the irradiation angle position of the right headlight (left headlight) matches the irradiation angle position set by the irradiation angle position setting device 1-1 after the change.

When the irradiation angle position set by the irradiation angle position setting device 1-1 is changed in the upward direction, the currents I _c1 and I _c2 flowing into the irradiation angle position setting device 1-1 increase. The comparison output of the comparator CP2 _R (CP2 _L ) becomes “L” level, the operation opposite to the above is performed, and the irradiation angle position of the right headlight (left headlight) is set to the irradiation angle position setting unit 1-1. Will match the set irradiation angle position after the change in.

In the irradiation angle position adjusting device which performs such a basic operation, during the operation of adjusting the irradiation angle position, the current I _c1 is adjusted.
Is broken. In this case, the voltage V at the connection point P1 _R in the right headlight drive unit 2-1
The sp _R rises abnormally, and the output of the comparator CP1 _R becomes “L” level. Thereby, the motor driver 2-
11 becomes “L” level, the motor driver 2-11 enters a standby state, and the motor M
_R is stopped, and the irradiation angle position of the right headlight is fixed in place.

On the other hand, when the line L1 through which the current _Ic1 flows is disconnected, the voltage V1 at the connection point P0 abnormally drops due to the current (R3 << R2) flowing between the base and the emitter of the transistor Q2 to the resistor R3. As a result, the base current flowing through the transistor Q3 decreases, the current _Ic2 decreases, and the connection point P in the left headlight drive unit 3-1 is reduced.
1 _L of the voltage Vsp _L rises abnormally. Thus, the output of the comparator CP1 _L becomes "L" level, and "ST bar" input of the motor driver 3-11 becomes "L" level, the motor driver 3-11 is the standby state, the motor M _L is stopped Then, the irradiation angle position of the left headlight is fixed in place.

On the other hand, it is assumed that the line L1 through which the current _Ic1 flows is short-circuited with the ground line during the adjustment operation of the irradiation angle position. In this case, the right headlight drive unit 2-
1, the voltage Vsp _{R at the} connection point P1 _R abnormally decreases,
The output of the comparator CP4 _R becomes “L” level. Thus, by "ST bar" input of the motor driver 2-11 becomes "L" level, the motor driver 2-11 is the standby state, the motor M _R is stopped, the irradiation angle position of the right headlamp is situ Fixed to

On the other hand, when the line L1 through which the current _Ic1 flows is short-circuited to the ground line, a current flows between the base and the collector of the transistor Q2, and the voltage V1 at the connection point P0 drops abnormally. Thus, the transistor Q3 is turned off, no longer current I _c2 flows, the voltage Vsp _L at the connection point P1 _L in the left headlight driving unit 3-1 is increased abnormally. As a result, the output of the comparator CP1 _L becomes “L” level, and “ST” of the motor driver 3-11 is output.
The “bar” input becomes “L” level, and the motor driver 3
-11 enters the standby state, the motor M _L is stopped, the irradiation angle position of the left headlight is fixed in place.

During the adjustment operation of the irradiation angle position, the current I
_When the line L2 through which _c2 flows is disconnected or short-circuited to the ground line, the right headlight drive unit 2-1 and the left headlight drive unit 3-1 perform the opposite operations to the above, and The irradiation angle position of the headlight is fixed in place.

[Embodiment 2] FIG. 2 is a circuit diagram of an irradiation angle position adjusting apparatus showing another embodiment (Embodiment 2) of the present invention. In this embodiment, during the adjustment operation of the irradiation angle position,
When the line L1 of the flow of the current I _c1 is disconnected, the voltage at the connection point P1 _R in the right headlamp driving unit 2-2 Vsp _R
Abnormally drops, and the output of the comparator CP4 _R becomes “L” level. As a result, the transistor Q4 _R is turned off, the transistor Q5 _R is turned off, relay R
energizing energizing the _y1R is released, the movable contact S1 _R is connected to the fixed contact point S1a _R side or relay R _Y2R urging energization is released, its movable contact S2 _R is stationary contacts S2,
a _R side, the motor M _R is stopped, and the irradiation angle position of the right headlight is fixed in place.

On the other hand, when the line L1 through which the current _Ic1 flows is broken, the voltage V1 at the connection point P0 in the irradiation angle position setting device 1-2 rises abnormally, and the transistor Q3 'is turned off. Thereby, the left headlight drive unit 3-2
, The voltage Vsp _{L at the} connection point P1 _L abnormally decreases, and the output of the comparator CP4 _L becomes “L” level. Thus, the transistor Q4 _L is turned off, the transistor Q5 _L is turned off, current energizing of the relay R _y1L is released, the movable contact S1 _L is the fixed contact S1a
Is connected to _L side or biased energization cancellation of the relay R _y2L, the movable contact S2 _L is connected to the fixed contact point S2a _L side, the motor M _L is stopped, the irradiation angle position of the left headlight is situ Fixed to

[0026] In this embodiment, during the adjustment operation of the irradiation angle position, when the line L2 of the flow of the line L1 and the current I _c2 of current flow I _c1 is shorted and the earth line, ground line and shorted side headlight Only in the lamp drive unit, the irradiation angle position of the headlight is fixed at the spot.

For example, when the line L1 through which the current _Ic1 flows is short-circuited with the ground line, the right headlamp drive unit 2
Voltage Vsp _R at the connection point P1 _R decreases abnormalities in -2, the output of the comparator CP4 _R becomes "L" level, the motor M _R is stopped, the irradiation angle position of the right headlamp is fixed in place You. On the other hand, even if the line L1 through which the current _Ic1 flows is short-circuited with the earth line, the voltage V1 at the connection point P0 does not abnormally increase in the irradiation angle position setting unit 1-2, and the left headlight driving unit 3-2 The adjustment operation of the irradiation angle position in is continuously performed.

[0028] However, in this embodiment, during the adjustment operation of the irradiation angle position, when the line L2 of the flow of the line L1 and the current I _c2 of current flow I _c1 and power lines and short, the irradiation angle position of the headlights of the left and right Will be fixed in place.

For example, when the line L1 through which the current _Ic1 flows is short-circuited with the power supply line, the right headlamp drive unit 2-
2, the voltage Vsp _{R at the} connection point P1 _R abnormally rises,
The output of the comparator CP1 _R becomes “L” level. As a result, the transistor Q4 _R is turned off, the transistor Q5 _R is turned off, the motor M _R is stopped, and the irradiation angle position of the right headlight is fixed at that position.

On the other hand, when the line L1 through which the current _Ic1 flows is short-circuited with the power supply line, the voltage V1 at the connection point P0 is changed in the irradiation angle position setting unit 1-2 in the same manner as when the line L1 is broken. Abnormally rises, and the transistor Q3 'is turned off. Thus, in the left headlamp drive unit 3-2, the motor M _L is stopped, the irradiation angle position of the left headlight is fixed in place.

[0031]

As is apparent from the above description, according to the present invention, when an abnormality occurs in the first signal (second signal) output from the irradiation angle position setting means, this is changed to the first (second signal). ), The irradiation angle position of the first (second) headlight is fixed in place, while the second signal (first signal) output from the irradiation angle position setting means is detected. )
Is abnormal, and this is detected by the second (first) abnormality detecting means, and the irradiation angle position of the second (first) headlamp is fixed in place, and the abnormality detection result is sent. Without any special signal line, if any one of the signals from the irradiation angle position setting device is abnormal, fix the irradiation angle position of the left and right headlights in place, and obtain a sufficient lighting effect It is possible to obtain.

[Brief description of the drawings]

FIG. 1 is a circuit configuration diagram of an irradiation angle position adjusting device showing one embodiment (embodiment 1) of the present invention.

FIG. 2 is a circuit configuration diagram of an irradiation angle position adjusting device showing another embodiment (Embodiment 2) of the present invention.

[Explanation of symbols]

1-1 irradiation angle locator RV1 variable resistor Q1 PNP transistor Q2 NPN transistors Q3 NPN transistor 2-1 right headlamp driving unit RV2 _R variable resistor M _R motor R5 _R to R13 _R resistor CP1 _R ~CP4 _R comparator 2 -11 motor driver 3-1 left headlight driving unit RV2 _L variable resistor M _L motor R5 _L to R13 _L resistors CP1 _L ~CP4 _L comparators 3-11 motor driver

Claims (1)

(57) [Claims] 1. An irradiation angle position setting means for outputting first and second signals corresponding to a set irradiation angle position, and a first signal output from the irradiation angle position setting means as an input, based on this signal. A first irradiation angle position adjusting means for adjusting the irradiation angle position of the first headlamp, and a second signal output from the irradiation angle position setting means, and a second signal A second irradiation angle position adjusting means for adjusting the irradiation angle position of the lamp; and when an abnormality occurs in the first signal, detecting the abnormality and stopping the operation of the first irradiation angle position adjusting means. A first abnormality detecting unit; a second abnormality detecting unit that detects an abnormality in the second signal and stops the operation of the second irradiation angle position adjusting unit when the second signal has an abnormality; If an abnormality occurs in the second signal, the second signal is regarded as abnormal. The vehicle headlamp illumination angular position adjusting apparatus characterized by comprising a means for abnormal the first signal when the abnormality in the second signal occurs.