US3631393A - Vehicle lamp failure warning system having warning circuit completed when lamp is off - Google Patents
Vehicle lamp failure warning system having warning circuit completed when lamp is off Download PDFInfo
- Publication number
- US3631393A US3631393A US833404A US3631393DA US3631393A US 3631393 A US3631393 A US 3631393A US 833404 A US833404 A US 833404A US 3631393D A US3631393D A US 3631393DA US 3631393 A US3631393 A US 3631393A
- Authority
- US
- United States
- Prior art keywords
- lamp
- completed
- circuit
- transistor
- vehicle
- 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 - Lifetime
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Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B39/00—Circuit arrangements or apparatus for operating incandescent light sources
- H05B39/10—Circuits providing for substitution of the light source in case of its failure
-
- 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
- B60Q11/00—Arrangement of monitoring devices for devices provided for in groups B60Q1/00 - B60Q9/00
- B60Q11/005—Arrangement of monitoring devices for devices provided for in groups B60Q1/00 - B60Q9/00 for lighting devices, e.g. indicating if lamps are burning or not
Definitions
- a lamp failure warning system for a road vehicle has a first lamp circuit which is completed when the lamp is to be illuminated and a second lamp circuit which is completed when the lamp is extinguished but has a resistance sufficiently high to ensure that the lamp is not illuminated. Means is provided sensitive to failure of the lamp when either circuit is completed for giving a warning when the lamp fails.
- a lamp failure warning system comprises a first lamp circuit which is completed when the lamp is to be illuminated, a second lamp circuit which is completed when the lamp is extinguished and which has a resistance sufficiently high to ensure that the lamp is not illuminated, and means sensitive to failure of the lamp when either the first or the second lamp circuits is completed for giving a warning when the lamp fails.
- FIGS. I and 2 are circuit diagrams illustrating two examples of the invention, as applied to the electrical system of a road vehicle, and FIG. 3 is a circuit diagram showing a modification of FIG. 1.
- the battery 12 of the vehicle has its negative terminal connected to an earthed supply line 14, and its positive terminal connected to a supply line 13 through parallel paths one of which contains the ignition switch II of the vehicle and a resistor 5 in series, and the other of which contains a lighting switch 15.
- the switch 15 when operated operates simultaneously a second switch 16 controlling the supply of power to a supply line 24, and connected in parallel between the lines 24, I4 are four circuits each containing a diode 6 and a lamp 7 in series.
- the lamps 7 could, for example, be the side and taillights of the vehicle.
- the junction of the diodes 6 and lamps 7 are connected through resistors 8 to the bases of four PNP-transistors 9 the emitters of which are connected to the line 13 and the collectors of which are connected through four resistors 10 to the bases of four NPN transistors 17.
- the transistors 17 have their emitters connected to the line 14, and their collectors connected through four resistors 18 to the junction of the switch 11 and resistor 5.
- the collectors of the transistors 17 are further connected through four diodes 19 to the base of an NPN-transistor 20, the emitter of which is connected to the line 14 through a resistor 12, and is also connected to the base of an NPN-transistor 21 having its emitter connected to the line 14.
- the collectors of the transistors 20, 21 are connected through a warning lamp 23 to the junction of the resistor 5 and switch 11.
- FIG. 2 shows an alternative arrangement which is suitable for use with a positive earth system.
- the battery 41 of the vehicle has its positive, earthed, terminal connected to a supply line 43 and its negative terminal connected to a supply line 44.
- One side of the lamp 25 to be monitored is connected to the line 43, and its other side is connected to the line 44 through a diode 26 and the switch 27 controlling the lamp, the junction of the lamp 25 and diode 26 being connected through a resistor 28 at the base of an NPN-transistor 29, the emitter of which is connected to the line 44 through the ignition switch 42 and the collector of which is connected through a resistor 31 to the line 43.
- the collector of the transistor 29 is also connected through a diode 32 to the base of an NPN- transistor 34 having its emitter connected to the base of an NPN-transistor 33, the emitter of which is connected to the line 44, through the switch 42.
- the collectors of the transistors 33 and 34 are connected through a warning lamp 35 to the line 43.
- FIG. I the lamp switch I5, 16 is a double switch, and the resistor 5 is employed, whereas in FIG. 2 a single lamp switch 27 is used and there is no equivalent to the resistor 5.
- the low-gain PNP-transistor 9 require a low valve for resistors 8 in order that insufficient base drive can be supplied to saturate them.
- the resistor 5 is incorporated to increase the base-emitter resistance of each of the transistors 9. It is then necessary to use the two-part lighting switch l5, 16 to isolate the line 24 from the line 13 when the switches l5, 16 are open. This problem does not arise in FIG. 2, where the transistors 29 equivalent to the transistors 9 in FIG. 1 are NPN-transistors which have higher gains.
- FIG. 3 In systems where it is inconvenient to use a double switch 15, I6, the modification shown in FIG. 3 can be used.
- FIG. 3 only the circuit associated with one lamp 7 is shown, and it will be seen that compared with FIG. I the part 16 of the switch 15, 16 is omitted, with the diode 6 having its anode connected through the switch 15 directly to the positive battery terminal.
- the resistor 5 is also omitted, so that the switch 11 completes a direct connection to the line 13.
- Each transistor 9 is now replaced by a pair of transistors 9a and 9b.
- the transistor has its base connected to the resistor 8 and its emitter connected to the line 13, while its collector is connected to the base of the transistor 9b, the collector of which is connected to the line 13 and the emitter of which is connected to the resistor 10.
- the transistors 90 and 9b form an effective high-gain PNP-combination, and using this arrangement the resistor 8 can be chosen so that the circuit operates satisfactorily without the necessity of the resistor 5, and the consequent requirement for a double switch 15, 16.
- a lamp failure warning system comprising a first lamp circuit which is completed when the lamp is to be illuminated, a second lamp circuit which is completed when the lamp is extinguished, and which has a resistance sufficiently high to ensure that the lamp is not illuminated, said first lamp circuit when completed increasing the current flow in the lamp to illuminate the lamp, and a second lamp circuit remaining completed when the first lamp circuit is completed, and means operable by said second lamp circuit and sensitive to failure of the lamp when either the first or second lamp circuits is completed for giving a warning when the lamp falls.
- a lamp failure warning system for a road vehicle comprising a series circuit connected across the battery of the vehicle and including a lighting switch, a diode and a lamp, a second circuit connected across the vehicle b ttery and including the ignition switch of the vehicle, the emitter-base path of a transistor, a resistor and said lamp, said second circuit being completed when the ignition switch is closed to cause the transistor to conduct but the current flowing through the lamp being insufi'rcient to energize it until the lighting switch is closed, and means operable by the collector current of said transistor for giving a warning when the baseemitter current of said transistor is broken by failure of said lamp. 5
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Lighting Device Outwards From Vehicle And Optical Signal (AREA)
- Emergency Alarm Devices (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB31263/68A GB1263711A (en) | 1968-07-01 | 1968-07-01 | Road vehicle lamp failure warning systems |
Publications (1)
Publication Number | Publication Date |
---|---|
US3631393A true US3631393A (en) | 1971-12-28 |
Family
ID=10320497
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US833404A Expired - Lifetime US3631393A (en) | 1968-07-01 | 1969-06-16 | Vehicle lamp failure warning system having warning circuit completed when lamp is off |
Country Status (4)
Country | Link |
---|---|
US (1) | US3631393A (de) |
DE (1) | DE1933016C3 (de) |
FR (1) | FR2012036A1 (de) |
GB (1) | GB1263711A (de) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3952229A (en) * | 1973-10-31 | 1976-04-20 | Siemens Aktiengesellschaft | Display device having signal lamps |
US3992695A (en) * | 1973-11-30 | 1976-11-16 | Nissan Motor Co., Ltd. | Apparatus for detecting the fault of indicating lamps |
US4320383A (en) * | 1979-03-19 | 1982-03-16 | Jaeger | Fault detector for vehicle brake lights |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1379602A (en) * | 1971-03-05 | 1975-01-02 | Cav Ltd | Operating circuit for a lamp |
DE2602702C2 (de) * | 1976-01-24 | 1983-09-08 | Bayerische Motoren Werke AG, 8000 München | Schaltungsanordnung zum Prüfen von Betriebsfunktionen in Kraftfahrzeugen |
DE2940283C2 (de) * | 1979-10-02 | 1982-06-16 | Gerhard 1000 Berlin Dorn | Kontrolleinheit für Fahrzeugbeleuchtungen |
DE3313712A1 (de) * | 1983-04-15 | 1984-10-18 | AEG-Telefunken Kabelwerke AG, Rheydt, 4050 Mönchengladbach | Schaltung zur fehlermeldung bei einem ueber eine steuerbare schalteinrichtung geschalteten stromverbraucher |
DE3500676A1 (de) * | 1985-01-11 | 1986-07-17 | Robert Bosch Gmbh, 7000 Stuttgart | Einrichtung zur kontrolle von elektrischen verbrauchern in kraftfahrzeugen |
GB2170068B (en) * | 1985-01-11 | 1988-08-17 | Hollingsworth Uk Ltd | Line break detector |
FR2651892B1 (fr) * | 1989-09-14 | 1991-12-06 | France Etat Armement | Dispositif de commande et de controle d'organes d'eclairage ou de signalisation. |
FR2785760B1 (fr) * | 1998-11-10 | 2001-03-09 | Jean Pierre Cauquil | Dispositif d'avertissement sonore ou visuel de controle d'un circuit electrique de signalisation |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3076123A (en) * | 1959-07-06 | 1963-01-29 | Julian A Mcdermott | Bulb changing means |
US3252157A (en) * | 1961-05-04 | 1966-05-17 | Licentia Gmbh | Converter |
US3271736A (en) * | 1963-08-30 | 1966-09-06 | Richard J Brown | Transistorized circuit condition warning device for vehicles |
US3408625A (en) * | 1965-08-03 | 1968-10-29 | Gen Motors Corp | Lamp burnout detection circuit |
US3421157A (en) * | 1966-01-24 | 1969-01-07 | Wagner Electric Corp | Lamp outage detector |
US3428943A (en) * | 1966-01-10 | 1969-02-18 | Bendix Corp | Automobile turn signal with lamp failure indicator |
-
1968
- 1968-07-01 GB GB31263/68A patent/GB1263711A/en not_active Expired
-
1969
- 1969-06-16 US US833404A patent/US3631393A/en not_active Expired - Lifetime
- 1969-06-23 FR FR6920967A patent/FR2012036A1/fr not_active Withdrawn
- 1969-06-28 DE DE1933016A patent/DE1933016C3/de not_active Expired
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3076123A (en) * | 1959-07-06 | 1963-01-29 | Julian A Mcdermott | Bulb changing means |
US3252157A (en) * | 1961-05-04 | 1966-05-17 | Licentia Gmbh | Converter |
US3271736A (en) * | 1963-08-30 | 1966-09-06 | Richard J Brown | Transistorized circuit condition warning device for vehicles |
US3408625A (en) * | 1965-08-03 | 1968-10-29 | Gen Motors Corp | Lamp burnout detection circuit |
US3428943A (en) * | 1966-01-10 | 1969-02-18 | Bendix Corp | Automobile turn signal with lamp failure indicator |
US3421157A (en) * | 1966-01-24 | 1969-01-07 | Wagner Electric Corp | Lamp outage detector |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3952229A (en) * | 1973-10-31 | 1976-04-20 | Siemens Aktiengesellschaft | Display device having signal lamps |
US3992695A (en) * | 1973-11-30 | 1976-11-16 | Nissan Motor Co., Ltd. | Apparatus for detecting the fault of indicating lamps |
US4320383A (en) * | 1979-03-19 | 1982-03-16 | Jaeger | Fault detector for vehicle brake lights |
Also Published As
Publication number | Publication date |
---|---|
DE1933016C3 (de) | 1974-02-07 |
FR2012036A1 (de) | 1970-03-13 |
GB1263711A (en) | 1972-02-16 |
DE1933016A1 (de) | 1970-04-23 |
DE1933016B2 (de) | 1973-07-12 |
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