GB2325758A - Controlling irradiation direction of lamp - Google Patents
Controlling irradiation direction of lamp Download PDFInfo
- Publication number
- GB2325758A GB2325758A GB9811009A GB9811009A GB2325758A GB 2325758 A GB2325758 A GB 2325758A GB 9811009 A GB9811009 A GB 9811009A GB 9811009 A GB9811009 A GB 9811009A GB 2325758 A GB2325758 A GB 2325758A
- Authority
- GB
- United Kingdom
- Prior art keywords
- irradiation direction
- lamp
- stepping motor
- control apparatus
- supply voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
- B60Q1/02—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments
- B60Q1/04—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights
- B60Q1/06—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights adjustable, e.g. remotely-controlled from inside vehicle
- B60Q1/08—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights adjustable, e.g. remotely-controlled from inside vehicle automatically
- B60Q1/10—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights adjustable, e.g. remotely-controlled from inside vehicle automatically due to vehicle inclination, e.g. due to load distribution
- B60Q1/115—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights adjustable, e.g. remotely-controlled from inside vehicle automatically due to vehicle inclination, e.g. due to load distribution by electric means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q2300/00—Indexing codes for automatically adjustable headlamps or automatically dimmable headlamps
- B60Q2300/10—Indexing codes relating to particular vehicle conditions
- B60Q2300/13—Attitude of the vehicle body
- B60Q2300/132—Pitch
Abstract
The control of the irradiation direction of the lamp is not affected significantly by a variation in a supply voltage or current supplied to a stepping motor 6 directing the irradiation direction of the lamp 5 to a desired direction. When detection means 9 detects a change in a supply voltage or a current supplied to the stepping motor 6, the detection means 9 informs control means 3 of the change so that the control means 3 restricts the allowable range of the rotational speed of the stepping motor 6. For example, the control means 3 defines the allowable range of the rotational speed of the stepping motor 6 in a stepwise fashion or continuously in accordance with a reduction in the supply voltage or the current. When it is detected that the supply voltage or the current comes off a predetermined range, the control means 3 stops controlling the stepping motor 6. Another embodiment limits the rotational speed of the stepping motor in response to rotational status of the motor which may be coil current, position, speed or the like.
Description
2325758 IRRADIATION DIRECTION CONTROL APPARATUS FOR LAMP The present
invention relates to an irradiation direction control apparatus for a lamp, which uses a stepping motor as a drive source to direct the irradiation direction of the lamp to a desired direction.
There are known apparatus capable of manually or automatically changing the irradiation direction of - a lamp installed in a vehicle. The former type is a so-called leveling apparatus which adjusts the irradiation direction of a lamp using an operation switch provided inside a vehicle in accordance with the load condition or riding condition. The latter type is a so-called auto-leveling apparatus which always corrects the irradiation direction of a lamp installed in a vehicle in such a way as to cancel out a change in the running state of the vehicle in order to prevent the direction of the irradiated light from the lamp from being changed by the change in the state of the vehicle.
Those types of apparatuses have some sort of drive means for altering the irradiation direction of a lamp within a given angular range, for example, one designed to control the inclination angle of a reflector by means of an actuator using a stepping motor.
In a case where the supply voltage to the stepping motor in the conventional apparatus varies, when the drive frequency of the stepping motor exceeds the allowablerange, the operation of the stepping motor may not be guaranteed. When the irradiation direction of a vehicular lamp is shifted in an unexpected direction, for example, the irradiated light may undesirably dazzle the driver of an approaching vehicle or an oncoming pedestrian.
Accordingly, it is an objective of the present invention to provide an irradiation direction control apparatus for a lamp using a stepping motor, which apparatus prevents control on the irradiation direction of the lamp from being significantly affected by a variation in a supply voltage to be supplied to the stepping motor.
To achieve the object, an irradiation direction control apparatus for a lamp according to this invention is provided with detection means for detecting a supply voltage or a current to be supplied to the stepping motor or a change in the supply voltage or the current, and control means for restricting an allowable range of a rotational speed of the stepping motor in accordance with a detection signal from the detection means.
According to this invention, therefore, as the allowable range of the rotational speed of the stepping motor is restricted in accordance with a variation in power, the stepping motor does not rotate outside the guaranteed operational range.
Other aspects and advantages of the inven4k.-.ion'will become apparent from the following description, taken in conjunction with the accompanying drawings, illustrating by way of example the principles of the invention.
The invention, together with objects and advantages thereof, may best be understood by reference to the following description of the presently preferred. embodiments together with the accompanying drawings in which:
Figure 1 is a block diagram illustrating the basic constitution of an irradiation direction control apparatus according to this invention; Figure 2 is a graph for conceptually explaining a process by control means; Figure 3 is a circuit block diagram illustrating the constitution of an irradiation direction control apparatus according to one embodiment of this invention, together with Figures 4 and 5; Figure 4 is a circuit block diagram depicting the constitutions of the essential portions of the apparatus; and Figure 5 is a flowchart illustrating the flow of a control process.
Figure 1 shows the basic constitution of an irradiation direction control apparatus according to this invention.
An irradiation direction control apparatus 1 comprises instruction means 2, control means 3 and drive means 4. A lamp 5 whose irradiation direction is controlled via the drive means 4 by the control means 3 is a headlamp (including a fog lamp and cornering lamp besides a headlamp in a narrower sense) in the case of a vehicular lamp, for example.
The drive means 4, provided to direct the irradiation direction of the lamp 5 to a desirdd direction, includes a stepping motor 6 and a drive mechanism 7 which is driven by the stepping motor 6.
The instruction means 2 sends the control means 3 a signal necessary to control the irradiation direction of the lamp 5 (e.g., a manipulation signal when the irradiation direction of the lamp 5 is controlled manually or a detection signal based on which the irradiation direction of the lamp 5 is controlled automatically Xa detection signal of the vehicle's state in an auto-leveling apparatus).
The apparatus 1 further comprises detection means 9 which detects a supply voltage or a current to be supplied to the stepping motor 6 from a power supply 8 or a change in the supply voltage or the current. The result of detection by the detection means 9 is sent to the control means 3.
The control means 3 restricts the allowable range of the rotational speed of the stepping motor 6 in accordance with the supply voltage or the current or a change in the supply voltage or the current. acquired by the detection means 9.
Figure 2As a conceptual, explanatory diagram for a control process which is performed by the control means 3, and conceptually exemplifies the relationship between'the supply voltage (Vs) to the stepping motor 6, taken on the horizontal scale, and the allowable range of the rotational speed of the stepping motor 6 (i.e., the drive frequency or pulse rate), taken on the vertical scale. The upper and lower limits of the allowable range are indicated by "NU11 and M" respectively.
If the upper limit NU is lowered in a stepwise fashion in accordance with a reduction in supply voltage Vs as indicated by a graph line 91 (the solid line) in Figure 2 or the lower limit NL is lowered in a stepwise fashion in accordance with a reduction in supply voltage Vs as indicated by a graph. line g2 (the broken line), for example, the allowable range of the rotational speed (AN = NU - NL where AN is the allowable range) can be defined to be variable according to a stepwise change in supply voltage Vs.
Alternatively, NU or NL may be defined to decrease continuously in accordance with a decrease in supply voltage Vs as shown by curved graph lines g11 and g2' of one-dot chain lines in the diagram. Further, the supply voltage Vs may of course be replaced with the supply current.
When the supply voltage or current obtained by the detection means 9 goes off the allowable range, the control means 3 stops controlling the stepping motor 6. This is because inhibiting control on the stepping motor 6 is preferable to rotating the stepping motor in.such a state where the operation is no longer guaranteed, from the viewpoint of ftot changing the irradiation direction of the lamp 5 excessively as well as preventing the irradiation direction from being directed to an unexpected direction (i.e., the control means 3 can always know the stop position).
Although Figure I illustrates the constitution that has the detection means 9 provided for the power supply 9 to directly detect the supply voltage or current to be supplied to the stepping motor 6, this invention is in no way li-mited to this constitution. For example, status detection means for monitoring the rotational -status of the stepping motor 6 based on the coil current, position, speed or the like of the stepping motor 6 may be provided to detect the influence of a variation in power indirectly from the behavior of the stepping motor 6.
Methods of changing the irradiation direction of the lamp 5 by the drive means 4 include a scheme of allowing the drive means 4 to tilt the whole lamp to thereby change the irradiation direction and a scheme of controlling the driving of a part of the components of the lamp. For instance, the drive means 4 may tilt a reflector placed inside the lamp 5 within the vertical plane to alter the direction of the reflected light, or the drive means 4 may tilt the lens to alter the direction of the irradiated light that has passed the lens. Various other, schemes may be realized by various combinations of the optical components of the lamp. For example, instead of tilting the whole reflector or the whole lens, the position of part of the reflector or lens may be controlled to change the essential portion of the irradiated light to the desired direction, or the shade may be shifted in the desired direction by the drive means 4 to change the dark-bright boundary in the light distribution pattern of the lamp.
- 7 Alternatively, the drive means 4 may move a combination of the reflector and the light source, a combination of the lens and the reflector, or a combination of the lens and the shade to thereby change the direction of the irradiated light in the up and down direction.
Figures 3 through 5 illustrate one embodiment of the invention as adapted to an irradiation direction control apparatus for a vehicular lamp.
An apparatus 10 is an auto-leveling apparatus which automatically responds to a change in the vehicle's state to correct the irradiation direction of the lamp. As shown in Figure 3, the auto-leveling apparatus 10 has an ECU (Electronic Control Unit) 11 which incorporating a computer that accomplishes the function of the control means 3. Input signals to the ECU 11 are detection signals from vehicle body height sensors 12 and 13, respectively provided at the front and rear axle shaft portions of the vehicle, a lighting instruction signal SW issued by a headlamp switch 14, an ignition signal 1g which ignites the engine and a detection signal from a vehicle speed sensor 15.
The vehicle body height sensors 12 and 13, which constitute vehicle state detecting means, serve to detect the vehicle's state (including the up or down inclination in the running direction of the vehicle) while the vehicle is still and/or is moving. Available detection schemes include a scheme of detecting the amount of expansion or contraction of the suspension of an axle, a scheme of measuring the distance between the vehicle height sensor and the road surface using detection waves, such as ultrasonics, a laser beam, and a scheme of detecting the vehicle's state by using a gyrosensor (which is used in a two wheeler or the like).
A compensation signal output from the EW 11 is sent to drive sections 16 and 161 which respectively control the irradiation directions of left and right lamps provided at the front portion of the vehicle. The drive sections 16 and 16' are respectively provided with stepping motors 16a and 16'a as drive sources and motor drivers 16b and 161b for the respective motors. As the stepping motor 16a or 161a rotates, the slide shaft of an actuator 16c or 161c provided in the lamp 17 or 1V, for example, moves back and forth. This tilts the associated reflector in the vertical plane to alter the direction of the optical axis of the reflector in the lamp 17 or 1V, thereby controlling the irradiation direction of the lamp 17 or 171.
Figure 4 exemplifies the constitutions of the essential portions (only one drive section 16 shown). A power supply circuit 19, which supplies power to a computer 18, the control center,' the stepping motor 16a and the motor driver 16b, has the function of the aforementioned detection means 9.
The signals SW and lg are input via an OR gate 21, which is comprised of diodes 20 and 201, to the power supply circuit 19. Specifically, the signal SW becomes an H (High) level signal at thetime of instructing the lightON event and becomes an L (Low) level signal at the time of instructing the light-OFF event, while the signal lg becomes an H-level signal at the time of starting the engine and becomes an L-level signal otherwise.
The power supply circuit 19 is designed in such a manner that to supply power to the computer 18 when the signal SW or the signal Ig has an H levelp the circuit 19 supplies various voltages, generated from the voltages of those signals SW and Ig, to the individual circuit components as supply voltages and sends the computer 18 a detection signal Sv of a supply voltage, which is obtained as the voltage of the signal SW or the signal Ig (i.e., both signals SW and ig provide the'power supply circuit 19 a predetermined supply voltage).
Figure 5 is a flowchart illustrating one.example of the process of the computer 18. When the aforementioned OR signal of the signals SW and lg instructs the operation of the apparatus 10, first, the power supply circuit 19 detects the supply voltage Vm to the stepping motor 16a (161a) in step S1.
In step S2, it is determined if Vm1s equal to or greater than the upper limit (V3). When Vrn k V3, the flow proceeds to step S8 to stop control on the stepping motor 16a (161a), but when Vm < V3, the flow goes to step S3.
It is determined in step S3 if Vm is equal to or larger than a predetermined value (V2; V2 < V3). When Vm k V2, the flow moves to step S7 to restrict the drive frequency of the stepping motor 16a (1Va) to or below a predetermined value Fa. When Vm < V2, on the other hand, the flow proceeds to step S4.
In step S4, it is determined if Vm is equal to or above the lower limit (V1; V1 < V2). When Vm a V1, the flow proceeds to step S6 to restrict the drive frequency of the stepping motor 16a (161a) to or below a predetermined value M (Fb < Fa). When Vm < V1, however, the f low proceeds to step S5 to inhibit control on the stepping motor 16a (161 a).
As the apparatus 10 defines the allowable range of the drive frequency of the stepping motor 16a (161a) in two steps in accordance with the supply voltage, the range of the operation-guaranteed voltage ot the actuator 16c (161c) can be defined to the range that corresponds to V1 s Vm s V3. As long as this range is wider than the range of the supply voltage to the computer 18, the actuator 16c (161c) can be controlled without any problem, preventing the follow-up speed of the actuator from dropping by the influence of a variation in supply voltage. When Vm c V3 or Vm < V1, control on the stepping motor 16a (161 a) is stopped to protect the motor and to fix the irradiation direction of the lamp 17 (171) so that the irradiation direction is changed unintentionally. This can guarantee safe driving at night.
As the steps S2 and S8 are associated with rotational control when the supply voltage Vm is an overvoltage, this control is unnecessary when an overvoltage-originated problem can be prevented by a constant current circuit or the like.
Although the detection signal Sv is sent to the computer 18 f rom the power supply circuit 19 in the abovedescribed constitution, the constitution may be modified in such a way that the detection signal Sv is sent to the motor driver 16b (16'b), as indicated by the two-dot chain line in Figure 4, to thereby alter the threshold value of the limiter which defines the upper limit of the drive frequency of the stepping motor 16a (161a).
- 11 According to this embodiment of this invention, as apparent from the foregoing description, because the allowable range of the rotational speed of the stepping motor is restricted in accordance with a variation in power to be supplied to the stepping motor, the stepping motor does not rotate outside the guaranteed operational range. It is therefore possible to prevent the irradiation direction of the lamp from being set to an unexpected direction.
According to a modification of this invention, the allowable range of the rotational speed of the stepping motor is defined in a stepwise fashion or continuously in accordance with a reduction in supply voltage or current. This can make it less likely for the rotational control to be affected by a change in power.
According to another modification of this invention, when it is detected that the supply voltage or the current goes off a predetermined range, control on the stepping motor is inhibited to ensure the reliable control operation.
I.
Claims (14)
1. An irradiation direction control apparatus for a lamp comprising: drive means for directing an irradiation direction of a lamp to a desired direction, said drive means including a stepping motor; detection means for detecting a supply voltage or a current to be supplied to said stepping motor or a change in said supply voltage or said current; and control means for restricting an allowable range of a rotational speed of said stepping motor in accordance with a detection signal from said detection means.
2. The irradiation direction control apparatus according to claim 1, wherein when said detection means detects a reduction in said supply voltage or said current. said control means defines said allowable range of said rotational speed of said stepping motor in a stepwise fashion or continuously in accordance with the reduction in said supply voltage or said current.
3. The irradiation direction control apparatus according to claiin 1 or 2, wherein when said detection means detects that said supply voltage or said current comes off a predetermined range, said control means stops controlling said stepping motor.
4. The irradiation direction control apparatus according to claim 2, wherein when said detection means detects a reduction in said supply voltage or said current, said control means reduces an upper limit or a lower limit of said allowable range in a stepwise fashion.
5. The irradiation direction control apparatus according to claim 2, wherein when said detection mean's detects a reduction in said supply voltage or said current, said control means reduces an upper limit or a lower limit of said allowable range continuously.
6. The irradiation direction control apparatus according to any one of claims 1 to 5, further comprising status detection means for detecting a rotational status of said stepping motor to thereby indirectly detect said supply voltage or said current from said rotational status of said stepping motor.
7. The irradiation direction control apparatus according to any one of claims 1 to 6, wherein said drive means tilts the entire lamp to change said irradiation direction of said lamp.
8. The irradiation direction control apparatus according to any one of claims 1 to 6, wherein said drive means controls driving of a part of components of said lamp to change said irradiation direction of said lamp.
9. The irradiation direction control apparatus according to claim 8, wherein said drive means tilts a reflector in a vertical plane to change a direction of reflected light.
10. The irradiation direction control apparatus according to claim 8, wherein said drive means tilts a lens to change a direction of irradiated light having passed said lens.
11. The irradiation direction control apparatus according to claim 8, wherein said drive means moves a shade in. a predetermined direction to change a dark-bright boundary of a light distribution pattern of said lamp in an up and down direction.
12. The irradiation direction control apparatus according to any one of claims 1 to 6, wherein said dzive means controls driving of a combinAtion of components of said lamp to change said irradiation direction of said lamp.
13. The irradiation direction control apparatus according to claim 9, wherein said drive means controls a position of part of said reflector to direct an essential part of irradiated light to a desired direction.
14. The irradiation direction control apparatus according to claim 10, wherein said drive means controls a position of part of said lens to direct an essential part of irradiated light to a desired direction.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP09136473A JP3128619B2 (en) | 1997-05-27 | 1997-05-27 | Lighting direction control device for lamp |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9811009D0 GB9811009D0 (en) | 1998-07-22 |
| GB2325758A true GB2325758A (en) | 1998-12-02 |
| GB2325758B GB2325758B (en) | 1999-06-30 |
Family
ID=15175952
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9811009A Expired - Fee Related GB2325758B (en) | 1997-05-27 | 1998-05-21 | Irradiation direction control apparatus for lamp |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP3128619B2 (en) |
| DE (1) | DE19823711C2 (en) |
| GB (1) | GB2325758B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6513958B2 (en) | 2000-10-27 | 2003-02-04 | Koito Manufacturing Co., Ltd. | Vehicle lamp system |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001322484A (en) * | 2000-05-12 | 2001-11-20 | Koito Mfg Co Ltd | Motor control circuit of device for adjusting optical axis of vehicle light |
| DE10040573B4 (en) * | 2000-08-18 | 2014-05-08 | Automotive Lighting Reutlingen Gmbh | Headlamp for vehicles for generating a dipped beam and at least one light beam with a longer range |
| DE10044392B4 (en) * | 2000-09-08 | 2018-10-04 | Automotive Lighting Reutlingen Gmbh | vehicle headlights |
| FR2881386B1 (en) * | 2005-01-28 | 2007-03-16 | Valeo Vision Sa | LIGHTING AND / OR SIGNALING SYSTEM FOR VEHICLE WITH PERFECTED ACTUATOR CONTROL |
| WO2023058629A1 (en) * | 2021-10-04 | 2023-04-13 | 株式会社小糸製作所 | Leveling control device and lamp system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2309773A (en) * | 1996-02-01 | 1997-08-06 | Koito Mfg Co Ltd | Controlling direction of vehicle lights |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL9002313A (en) | 1989-11-03 | 1991-06-03 | Carello Spa | CONTROL DEVICE FOR ORIENTABLE VEHICLE FLOODLIGHTS. |
| DE4102586C2 (en) * | 1990-01-31 | 2000-07-06 | Honda Motor Co Ltd | Headlights |
| DE4017856C2 (en) | 1990-06-02 | 2000-06-29 | Bayerische Motoren Werke Ag | Device for adjusting the headlight range of a motor vehicle headlight |
| DE4034047A1 (en) * | 1990-10-26 | 1992-04-30 | Bosch Gmbh Robert | Lighting arrangement with levelling device for vehicle - responds to changes in distribution of axle loads with repositioning of subsidiary screen across headlamp beam |
| JP2500134Y2 (en) | 1991-07-30 | 1996-06-05 | 市光工業株式会社 | Angle detection mechanism of automobile headlight irradiation angle adjustment device |
| DE4224307C2 (en) | 1992-07-23 | 2002-06-13 | Hella Kg Hueck & Co | Actuator for motor vehicles |
| DE19501173A1 (en) * | 1995-01-17 | 1996-07-18 | Bosch Gmbh Robert | Headlights for vehicles |
| JP3128606B2 (en) * | 1995-12-28 | 2001-01-29 | 株式会社小糸製作所 | Illumination direction control device for vehicle lighting |
-
1997
- 1997-05-27 JP JP09136473A patent/JP3128619B2/en not_active Expired - Fee Related
-
1998
- 1998-05-21 GB GB9811009A patent/GB2325758B/en not_active Expired - Fee Related
- 1998-05-27 DE DE1998123711 patent/DE19823711C2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2309773A (en) * | 1996-02-01 | 1997-08-06 | Koito Mfg Co Ltd | Controlling direction of vehicle lights |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6513958B2 (en) | 2000-10-27 | 2003-02-04 | Koito Manufacturing Co., Ltd. | Vehicle lamp system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3128619B2 (en) | 2001-01-29 |
| DE19823711C2 (en) | 2001-07-12 |
| DE19823711A1 (en) | 1998-12-24 |
| GB9811009D0 (en) | 1998-07-22 |
| JPH10326506A (en) | 1998-12-08 |
| GB2325758B (en) | 1999-06-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20070521 |