CA1314923C - Brake activated automatic control circuit for vehicle lighting system - Google Patents
Brake activated automatic control circuit for vehicle lighting systemInfo
- Publication number
- CA1314923C CA1314923C CA000529709A CA529709A CA1314923C CA 1314923 C CA1314923 C CA 1314923C CA 000529709 A CA000529709 A CA 000529709A CA 529709 A CA529709 A CA 529709A CA 1314923 C CA1314923 C CA 1314923C
- Authority
- CA
- Canada
- Prior art keywords
- scr
- switch
- relay
- vehicle
- control circuit
- 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.)
- Expired - Fee Related
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
- B60Q1/14—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 having dimming means
- B60Q1/1415—Dimming circuits
- B60Q1/1423—Automatic dimming circuits, i.e. switching between high beam and low beam due to change of ambient light or light level in road traffic
- B60Q1/143—Automatic dimming circuits, i.e. switching between high beam and low beam due to change of ambient light or light level in road traffic combined with another condition, e.g. using vehicle recognition from camera images or activation of wipers
-
- 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
- B60Q2300/11—Linear movements of the vehicle
- B60Q2300/114—Vehicle acceleration or deceleration
-
- 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
- B60Q2400/00—Special features or arrangements of exterior signal lamps for vehicles
- B60Q2400/30—Daytime running lights [DRL], e.g. circuits or arrangements therefor
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lighting Device Outwards From Vehicle And Optical Signal (AREA)
Abstract
ABSTRACT
BRAKE ACTIVATED AUTOMATIC CONTROL CIRCUIT
FOR VEHICLE LIGHTING SYSTEM
An automatic control circuit for vehicle lighting whereby to switch on the low beams of the head-lights, all running lights and interior dash lights when the vehicle is in operation. The circuit comprises a normally open relay having an open contact terminal connected to a battery supply. The relay has a coil which is connectable at one end to an ignition switch of a vehicle. An opposed end of the coil is connected to an anode of a silicon control rectifier (SCR) which is normally non-conductive. The SCR has a gate connected to a brake switch connection of the vehicle. When the brake switch is activated by depressing the brake pedal of the vehicle, the SCR is caused to conduct thereby energizing the relay, and through the relay contact applying the battery supply to the low beams running lights and inside dash lights of the vehicle. The control circuit is disabled by manually switching on the high beams of the headlights or turning off the ignition switch.
BRAKE ACTIVATED AUTOMATIC CONTROL CIRCUIT
FOR VEHICLE LIGHTING SYSTEM
An automatic control circuit for vehicle lighting whereby to switch on the low beams of the head-lights, all running lights and interior dash lights when the vehicle is in operation. The circuit comprises a normally open relay having an open contact terminal connected to a battery supply. The relay has a coil which is connectable at one end to an ignition switch of a vehicle. An opposed end of the coil is connected to an anode of a silicon control rectifier (SCR) which is normally non-conductive. The SCR has a gate connected to a brake switch connection of the vehicle. When the brake switch is activated by depressing the brake pedal of the vehicle, the SCR is caused to conduct thereby energizing the relay, and through the relay contact applying the battery supply to the low beams running lights and inside dash lights of the vehicle. The control circuit is disabled by manually switching on the high beams of the headlights or turning off the ignition switch.
Description
2 ~
BACKGROIJND OF INVENl'ION:
Field of Inven-tion The present invention relates to an improved automatic control circuit to apply voltage on the low beams of the headlights all running l.ights and interior dash lights of a vehicle and wherein the circuit is activated by depressing the brake pedal to apply a trlgger pulse to a silicon control rectifier (SCR) for causing a relay to energize, thus making the connection between the battery and the low beams of the headlights, running lights and interior dash lights. :~
Description of Prior Ar-t Various automatic control circuits are known to automatically apply a voltage to the lighting system of a vehicle when the engine is in operation. A disadvantage of such circuits is that often when the vehicle engine is turning it is not necessary to have the lighting system of the vehicle switched on, for example, if the automobile is parked, or if a mechanic is working on the automobile, etc. By continuously applyi.ng a voltage to the filaments of the lights, these filaments thus have a shorter life and it is necessary to replace these headlights more frequently, which is more costly ~ Also, with some prior art control. circuits it is necessary to connect these to the alternator or any other electrical component of the vehicle. This means that the circuit can be subjected to an overcharge, such as when boosting the battery.
q ~ 3 SUMMARY OF INVENTION:
It is a feature oE the present inventi.on to provide an improved automatic con-trol circuit for applying a voltage to the low beams of at least the headlights of the lighting system of a vehi.cle and which substantially overcomes all of the above-mentioned disadvantages of -the prio.r art.
.~ Another feature of the present invention is to provide an automatic control circuit for applying a voltage -to the low beams of the headlights, the running lights of inside dash lights of a vehicle only after the brake switch of a vehicle has been closed thereby permitting the automobile engine to function without the lighting system being turned on.
Another feature of -the present invention is to provide an automatic control. circuit for applying a voltage to the low beams of the headlights, the running ligh-ts and inside dash lights of a vehicle and wherein the control circuit is branched between the bat-tery and the lighting system wiring of the vehicle, and not to any electrical component of the vehicle electric circuit, such as the alternator.
According to the above features~ from a broad aspect, the present invention provides an automatic control circuit for vehicle headlights. The control circui-t comprises a normally open relay having an open contact -terminal connectable -to a battery supply. The relay has a coil connectable a-t one end to an ignition switch of a vehicle. An opposed end of the coil is connected to an anode of an SCR which is normally non-conductive. The SCR has a gate connectable to a brake switch connection of the vehicle. Biasing means is provided be-tween the gate and the ca-thode of the SCR. A diode is con-nected between the cathode and a high beam filament of -the headlights. The relay has a switch arm connection which is connectable to a low beam filament of the headlights. The switch arm is displaced to a close contact position to apply the battery supply voltage to the low beam filament when the SCR is rendered conductive so that current will flow through the coil of the relay from the ignition switch, and through the SCR and diode, and through the high beam filament and the ground connection. The SCR is rendered conductive by moment-arily closing a brake switch which is actuated by depressing the brake pedal of the vehicle whereby a trigger voltage impulse is applied to the gate of the SCR from the brake switch connection to render the SCR conduc-tive. When the SCR
is in a conductive state it maintains the connection of a battery supplied to the low beam filaments through the relay switch arm. The battery supply is removed from the low beam filament by displacing the ignition switch to an "open" con-tact position thereby removing the current flow -through the relay coil causing the relay switch arm to open.
BRIEF DESCRIPTION OF DRAWINGS:
A preferred embodiment of the present invention will now be described with reference to the example thereof illustrated in the accompanying drawing which is a schematic diagram of the brake activated automatic control circuit of the present invention.
DESCRIPTION OF PREFERRED EMBODIMENTS:
... _ . __ . . . .
Referring now to the drawing, the control circuit is herein shown as contained within the box enclosure delineated by phantom lines 10. The control circuit consists essentially of a double pole/single throw relay 11, an SCR 12, a pair of resistances 13 and 14, and a diode 15. The box enclosure is also provided with termi-nals 16 for connection at different points -to the electri-cal wiring of the vehicle and -to the car battery 17 only.
The construction and operation of the control circuit will now be described. As herein shown the relay 11 has a relay coil 18 which con-trols the switch arms 19 and 19' which are normally in an open condition. The engageable contacts 20 and 20' of the relay are connected together and to the car bat-tery 17 to obtain a supply voltage for supplying the low beam filament 21 of the headlights 22 as well as supplying an auxiliary lamp 24.
This supply voltage is applied through the low beam connections 23' and 23 when the switch contact arms 19 and 19' are closed, that is to say, engaging the terminaIs 20 and 20' respectively. The auxiliary lamp 24 herein repre-sents the tail light and side light circuits of the vehicle (not shown). The head lamp also has a high beam filament 26 which is connected by the high beam connection 26' directly to the manual light switch 2~, usually secured to the dashboard (not shown) of the vehicle. The switch 25 also has a low beam connection 21', a parking light and a side light coDnectlon 24' connected to the low beam filament 21 and lamp 24, respectively. This manual switch 25 is connected directly to the battery 17 by connection 27. The ignition switch 28 of the vehicle is connected to the relay coil 18 through connection 29.
The engageable contact 30 of this switch is connected directly to the battery wiring 31. However, when the ignition switch 28 is "closed7', al-though -the battery 17 is applied to the relay coil 18, i-t will not actua-te the 1~14~23 :
relay ~or tlle reason ~hat the co.L:I. .is conl-lected to an open circuit createcl by ~he SCl~ clevice 1.2. 'rh:is SCR is biased to be normaLly non-conducti.ve.
.trl order to challcJe the sla-e oE Lhe SCR ancl cause the relay 11 to be enercJized, I.t is necessary to depress the brake pedal o~ the vehi.cle -to close the brake switch 32 oE the vehicle wh:i.ch ~lsucll].y actuates a brake lamp 33. By depressing the bralce pedal the switch 32 is closed mormerltarily and, it being connected to the battery 17 through wire connection 34, sends a vol-tage impulse to the gate 35 o~ the SCR ].2 tllroucJII tl)e ~:i.rst: resistance 13.
l`he value oE that resistance is ~elected to provide a voltaye drop whereby to reduce tlle voltage -to the ratecl bi.as va.lue ~or the ga-te 35. ~I`his renclers the SCR conduc-tive. 'l'he coil 1~ .i.s conrlecte(:l to the anocle 36 oE -this SCR Witll -the cathode 37 being conrlected to the anode 38 of a ~orward bias diode 15. rl`lle d.i.ocle has its cathode 39 connectecl to a hi.gh beam conr~ecL.i.on ~0 b:ranc-~hed directly on the hi~ll beam ~ilament 2G. 'I'hrougll the ~ilamen-t the circuit i.s completed to the groulld connection 41. Accord-ingly, current can now flow Lhrouc3ll :the relay coil 1~ as there is a direct line to the cJround wire 41. Elowever, because tllere :is a substantial. vo:ltage drop across the coil 18 there is insu~Eici.ent currellt flowing throucJh the high beam filament to light tlle h.i.c3h beam.
~q, ., ~
. ~.
W.itll tl-le relay bei.n~ ener~;.ze(1, the contaets 19 and 19' are elosed ancl volta~e ;.s appl..iecl to tlle low beams of the vehiele as we.l.1 as the auxi.l.i.ary .lamp 24. I~oweverl this is on1y eEfeeted aE-ter the brake switeh has been elosed.
In order to d.i.seonnect t:lle control. eireu.it 10 the ignition switch is swi.tched off thus removing the supply voltage to the relay coi.1 1.8 and eausi.ng the swi-teh arms 19 and 19' to open -thus removing -tlle supp.l.y from -the low beams and auxi1iary 1amp. ~lso, i.E the manual switeh 25 on the dashboard of the vehic:l.e is p].aced -to energize the high beams, the battery supp.l.y is eonnee-ted to the high beam ~ilament, 26 through connection 26'. Reeause the hi.gh beam connection ~0 is also branclled on thi.s eonnee-tion 26', this voltage will thell appear on the anode 39 of the diode 15. Aecordingl.y, the cliode is rendered non-eonduetive as there ls a pos:itive vol-tage both on the eathode and on -the anode, ancl thi.s results i.n an open eireuit eondltion -thereby di.sabli.nc~ the relay 11, and again eausing the eontac-t arms l.~ and 19' to "open".
A1thougll the relay hexe:i.n described has a double pole, it is within the seope oE the invention to have a single pole branehed only -to the .l.ow beam ilament 21 whereby onl.y -the head1igh-ts are energ.ized by the eontrol cireuit.
.;.
It is within the ambit of the present invention to cover any obvious modifications of the circuit diagram as described herein, provide~ such modificatio`ns fall within the scope of the appended claims.
BACKGROIJND OF INVENl'ION:
Field of Inven-tion The present invention relates to an improved automatic control circuit to apply voltage on the low beams of the headlights all running l.ights and interior dash lights of a vehicle and wherein the circuit is activated by depressing the brake pedal to apply a trlgger pulse to a silicon control rectifier (SCR) for causing a relay to energize, thus making the connection between the battery and the low beams of the headlights, running lights and interior dash lights. :~
Description of Prior Ar-t Various automatic control circuits are known to automatically apply a voltage to the lighting system of a vehicle when the engine is in operation. A disadvantage of such circuits is that often when the vehicle engine is turning it is not necessary to have the lighting system of the vehicle switched on, for example, if the automobile is parked, or if a mechanic is working on the automobile, etc. By continuously applyi.ng a voltage to the filaments of the lights, these filaments thus have a shorter life and it is necessary to replace these headlights more frequently, which is more costly ~ Also, with some prior art control. circuits it is necessary to connect these to the alternator or any other electrical component of the vehicle. This means that the circuit can be subjected to an overcharge, such as when boosting the battery.
q ~ 3 SUMMARY OF INVENTION:
It is a feature oE the present inventi.on to provide an improved automatic con-trol circuit for applying a voltage to the low beams of at least the headlights of the lighting system of a vehi.cle and which substantially overcomes all of the above-mentioned disadvantages of -the prio.r art.
.~ Another feature of the present invention is to provide an automatic control circuit for applying a voltage -to the low beams of the headlights, the running lights of inside dash lights of a vehicle only after the brake switch of a vehicle has been closed thereby permitting the automobile engine to function without the lighting system being turned on.
Another feature of -the present invention is to provide an automatic control. circuit for applying a voltage to the low beams of the headlights, the running ligh-ts and inside dash lights of a vehicle and wherein the control circuit is branched between the bat-tery and the lighting system wiring of the vehicle, and not to any electrical component of the vehicle electric circuit, such as the alternator.
According to the above features~ from a broad aspect, the present invention provides an automatic control circuit for vehicle headlights. The control circui-t comprises a normally open relay having an open contact -terminal connectable -to a battery supply. The relay has a coil connectable a-t one end to an ignition switch of a vehicle. An opposed end of the coil is connected to an anode of an SCR which is normally non-conductive. The SCR has a gate connectable to a brake switch connection of the vehicle. Biasing means is provided be-tween the gate and the ca-thode of the SCR. A diode is con-nected between the cathode and a high beam filament of -the headlights. The relay has a switch arm connection which is connectable to a low beam filament of the headlights. The switch arm is displaced to a close contact position to apply the battery supply voltage to the low beam filament when the SCR is rendered conductive so that current will flow through the coil of the relay from the ignition switch, and through the SCR and diode, and through the high beam filament and the ground connection. The SCR is rendered conductive by moment-arily closing a brake switch which is actuated by depressing the brake pedal of the vehicle whereby a trigger voltage impulse is applied to the gate of the SCR from the brake switch connection to render the SCR conduc-tive. When the SCR
is in a conductive state it maintains the connection of a battery supplied to the low beam filaments through the relay switch arm. The battery supply is removed from the low beam filament by displacing the ignition switch to an "open" con-tact position thereby removing the current flow -through the relay coil causing the relay switch arm to open.
BRIEF DESCRIPTION OF DRAWINGS:
A preferred embodiment of the present invention will now be described with reference to the example thereof illustrated in the accompanying drawing which is a schematic diagram of the brake activated automatic control circuit of the present invention.
DESCRIPTION OF PREFERRED EMBODIMENTS:
... _ . __ . . . .
Referring now to the drawing, the control circuit is herein shown as contained within the box enclosure delineated by phantom lines 10. The control circuit consists essentially of a double pole/single throw relay 11, an SCR 12, a pair of resistances 13 and 14, and a diode 15. The box enclosure is also provided with termi-nals 16 for connection at different points -to the electri-cal wiring of the vehicle and -to the car battery 17 only.
The construction and operation of the control circuit will now be described. As herein shown the relay 11 has a relay coil 18 which con-trols the switch arms 19 and 19' which are normally in an open condition. The engageable contacts 20 and 20' of the relay are connected together and to the car bat-tery 17 to obtain a supply voltage for supplying the low beam filament 21 of the headlights 22 as well as supplying an auxiliary lamp 24.
This supply voltage is applied through the low beam connections 23' and 23 when the switch contact arms 19 and 19' are closed, that is to say, engaging the terminaIs 20 and 20' respectively. The auxiliary lamp 24 herein repre-sents the tail light and side light circuits of the vehicle (not shown). The head lamp also has a high beam filament 26 which is connected by the high beam connection 26' directly to the manual light switch 2~, usually secured to the dashboard (not shown) of the vehicle. The switch 25 also has a low beam connection 21', a parking light and a side light coDnectlon 24' connected to the low beam filament 21 and lamp 24, respectively. This manual switch 25 is connected directly to the battery 17 by connection 27. The ignition switch 28 of the vehicle is connected to the relay coil 18 through connection 29.
The engageable contact 30 of this switch is connected directly to the battery wiring 31. However, when the ignition switch 28 is "closed7', al-though -the battery 17 is applied to the relay coil 18, i-t will not actua-te the 1~14~23 :
relay ~or tlle reason ~hat the co.L:I. .is conl-lected to an open circuit createcl by ~he SCl~ clevice 1.2. 'rh:is SCR is biased to be normaLly non-conducti.ve.
.trl order to challcJe the sla-e oE Lhe SCR ancl cause the relay 11 to be enercJized, I.t is necessary to depress the brake pedal o~ the vehi.cle -to close the brake switch 32 oE the vehicle wh:i.ch ~lsucll].y actuates a brake lamp 33. By depressing the bralce pedal the switch 32 is closed mormerltarily and, it being connected to the battery 17 through wire connection 34, sends a vol-tage impulse to the gate 35 o~ the SCR ].2 tllroucJII tl)e ~:i.rst: resistance 13.
l`he value oE that resistance is ~elected to provide a voltaye drop whereby to reduce tlle voltage -to the ratecl bi.as va.lue ~or the ga-te 35. ~I`his renclers the SCR conduc-tive. 'l'he coil 1~ .i.s conrlecte(:l to the anocle 36 oE -this SCR Witll -the cathode 37 being conrlected to the anode 38 of a ~orward bias diode 15. rl`lle d.i.ocle has its cathode 39 connectecl to a hi.gh beam conr~ecL.i.on ~0 b:ranc-~hed directly on the hi~ll beam ~ilament 2G. 'I'hrougll the ~ilamen-t the circuit i.s completed to the groulld connection 41. Accord-ingly, current can now flow Lhrouc3ll :the relay coil 1~ as there is a direct line to the cJround wire 41. Elowever, because tllere :is a substantial. vo:ltage drop across the coil 18 there is insu~Eici.ent currellt flowing throucJh the high beam filament to light tlle h.i.c3h beam.
~q, ., ~
. ~.
W.itll tl-le relay bei.n~ ener~;.ze(1, the contaets 19 and 19' are elosed ancl volta~e ;.s appl..iecl to tlle low beams of the vehiele as we.l.1 as the auxi.l.i.ary .lamp 24. I~oweverl this is on1y eEfeeted aE-ter the brake switeh has been elosed.
In order to d.i.seonnect t:lle control. eireu.it 10 the ignition switch is swi.tched off thus removing the supply voltage to the relay coi.1 1.8 and eausi.ng the swi-teh arms 19 and 19' to open -thus removing -tlle supp.l.y from -the low beams and auxi1iary 1amp. ~lso, i.E the manual switeh 25 on the dashboard of the vehic:l.e is p].aced -to energize the high beams, the battery supp.l.y is eonnee-ted to the high beam ~ilament, 26 through connection 26'. Reeause the hi.gh beam connection ~0 is also branclled on thi.s eonnee-tion 26', this voltage will thell appear on the anode 39 of the diode 15. Aecordingl.y, the cliode is rendered non-eonduetive as there ls a pos:itive vol-tage both on the eathode and on -the anode, ancl thi.s results i.n an open eireuit eondltion -thereby di.sabli.nc~ the relay 11, and again eausing the eontac-t arms l.~ and 19' to "open".
A1thougll the relay hexe:i.n described has a double pole, it is within the seope oE the invention to have a single pole branehed only -to the .l.ow beam ilament 21 whereby onl.y -the head1igh-ts are energ.ized by the eontrol cireuit.
.;.
It is within the ambit of the present invention to cover any obvious modifications of the circuit diagram as described herein, provide~ such modificatio`ns fall within the scope of the appended claims.
Claims (6)
1. An automatic control circuit for vehicle headlights, said circuit comprising a normally open relay having an open contact terminal connectable to a battery supply, said relay having a coil connectable at one end to an ignition switch of said vehicle, an opposed end of said coil being connected to an anode of an SCR which is normally non-conductive, said SCR having a gate connectable to a brake switch connection of said vehicle, biasing means between said gate and a cathode of said SCR, a diode is connected between said cathode and a high beam filament of said headlights, said relay having a switch arm connection connectable to a low beam filament of said headlights, said switch arm being displaced to a closed contact position to apply said battery supply to said low beam filament when said SCR is rendered conductive, said SCR when conductive causing current to flow through said coil from said ignition switch and through said SCR and diode through said high beam filament and a ground connection, said SCR being rendered conductive by momentarily closing a brake switch which is actuated by depressing a brake pedal of said vehicle whereby a trigger voltage impulse is applied to said gate from said brake switch connection to render said SCR conductive, said SCR when in a conductive state maintains said battery supply on said low beam fila-ments through said relay switch arm, said battery supply being removed from said low beam filament by displacing said ignition switch to an "open" contact position thereby remov-ing the current flow through said relay coil and causing said relay switch arm to open.
2. A headlight control circuit as claimed in claim 1 wherein said low and high beam filaments are connected to a manual switch located on a dashboard of said vehicle, said manual switch being connected to said battery supply, said manual switch when placed to a high beam position connecting said battery supply to said high beam filament, said battery supply also being connected to a cathode of said diode to render said SCR non-conductive and causing said relay contact to open.
3. A headlight control circuit as claimed in claim 2 wherein said relay is a double pole/single throw relay having two of said switch arms, one switch arm being connected to said low beam filament and the other switch arm to auxiliary lamps.
4. A headlight control circuit as claimed in claim 2 wherein said biasing means comprises a voltage divider consisting of a first resistance connected between said brake switch and said gate of said SCR and a second series resis-tance connected between said gate and said cathode of said SCR.
5. A headlight control circuit as claimed in claim 4 wherein said one end of said resistance is connected to a further resistance at a common gate connection, said further resistance being connected at an opposed end to said brake connection, both said resistances constituting a voltage divider to produce said biasing potential.
6. A headlight control circuit as claimed in claim 3 wherein said auxiliary lamps comprise parking lights and side lights of said vehicle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000529709A CA1314923C (en) | 1987-02-13 | 1987-02-13 | Brake activated automatic control circuit for vehicle lighting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000529709A CA1314923C (en) | 1987-02-13 | 1987-02-13 | Brake activated automatic control circuit for vehicle lighting system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1314923C true CA1314923C (en) | 1993-03-23 |
Family
ID=4134971
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000529709A Expired - Fee Related CA1314923C (en) | 1987-02-13 | 1987-02-13 | Brake activated automatic control circuit for vehicle lighting system |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1314923C (en) |
-
1987
- 1987-02-13 CA CA000529709A patent/CA1314923C/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| USRE34886E (en) | Electrical system for vehicle daytime running lights | |
| US4985660A (en) | Vehicle windshield wiper light circuit | |
| US4723095A (en) | Daytime running lights using turn signal lamps | |
| US4713584A (en) | Vehicle light control system for automotive vehicles | |
| US3374394A (en) | Time delay control for lighting circuit | |
| US2944188A (en) | Automatic light controlled headlamp means | |
| US4841199A (en) | Electrical system for vehicle daytime running lights | |
| CA1314923C (en) | Brake activated automatic control circuit for vehicle lighting system | |
| US6734634B2 (en) | Control system for daytime running lights | |
| US2767347A (en) | Automatic headlight dimmer system | |
| US3733515A (en) | Lighting systems for road vehicles | |
| US2749478A (en) | Automatic headlight control system | |
| US6515425B1 (en) | Headlight anti-glare system | |
| EP0199779B1 (en) | Switching device | |
| US4934769A (en) | Power supply circuit for automotive headlamp | |
| US5747934A (en) | Lighting switch assembly with internal daytime running light control circuit | |
| US4890038A (en) | Power supply circuit for automotive headlamp with combinational switch | |
| US6456195B1 (en) | Vehicle lighting control system | |
| GB2194692A (en) | Head lamp circuit in lighting apparatus for vehicles | |
| JP2780197B2 (en) | Headlamp control device | |
| CA1316208C (en) | Vehicle light control system for automotive vehicles | |
| US4857754A (en) | Power supply circuit for automotive headlamp | |
| US5900698A (en) | Full beam discharge headlight with two power levels | |
| KR970006282Y1 (en) | Rear lamp and circuit of a car | |
| JPH0529947Y2 (en) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |