AU2008100741A4 - A traffic signal control system and method - Google Patents
A traffic signal control system and method Download PDFInfo
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- AU2008100741A4 AU2008100741A4 AU2008100741A AU2008100741A AU2008100741A4 AU 2008100741 A4 AU2008100741 A4 AU 2008100741A4 AU 2008100741 A AU2008100741 A AU 2008100741A AU 2008100741 A AU2008100741 A AU 2008100741A AU 2008100741 A4 AU2008100741 A4 AU 2008100741A4
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- traffic signal
- signal control
- external
- supply
- control system
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Description
07 nug 08 04:45p 3213132 P.
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00 0 o A TRAFFIC SIGNAL CONTROL SYSTEM AND METHOD 1 FIELD OF THE INVENTION O The present invention relates to a traffic signal control system. In particular, although not exclusively, the invention relates to a traffic signal control system for use in adverse or emergency situations.
00 ODESCRIPTION OF T''HE PRIOR ART Traffic light signals are essential in directing traffic flow and assisting the safety of both drivers and pedestrians at road intersections. Traffic signal controllers at road intersections operate the signals for maintaining smooth traffic flow through intersections. Typically, traffic signal controllers receive AC power from a local electricity grid.
Although traffic signal controllers function adequately under normal conditions, they lack suitable provisions in adverse or emergency situations. For instance, when a storm or an accident disrupts the AC power supply from the local electricity grid, some traffic signal controllers switch to a "flashing mode" when flashing light signals at the intersection warn drivers of an unsupervised intersection.
This mode contributes to the confusion at intersections following the adverse situation and can endanger the safety of drivers, pedestrians and emergency personnel at intersections during and following a power disruption.
It is an object of the present invention to at least ameliorate one or more of the disadvantages and shortcomings of the prior art, or at least provide a useful alternative to the flashing signal system mentioned above.
COMS ID No: ARCS-201380 Received by IP Australia: Time 16:49 Date 2008-08-07 07 Aug 08 04:45p 07 ug08 4 5 p3213132 p. 4 2 00 0 o SUMMARY OF THE INVENTION According to a first aspect of the invention there is provided a traffic signal control system comprising: a traffic signal control module powered by an external 0 alternating current source; and an auxiliary power module having an internal direct current source and coupled to the traffic signal control module to selectively power it the auxiliary power module configured to be selectively connected to an external 0 direct current source via an electrical lead; wherein the traffic signal control module is 00 configured to be powered by the auxiliary power module and selectively by the external direct current source when the external alternating current source is interrupted.
Preferably, the external direct current source is a DC electrical supply of a motor vehicle.
Preferably, the auxiliary power module includes at least one indicating means operative to indicate whether the traffic signal control module is being powered by the external alternating current source or by the auxiliary power module. The indicating means is preferably a visual indicator located at the control module so that external inspection can verify if the external AC supply is interrupted and the auxiliary power module is operating the traffic signal control system. The visual indicator includes an indicator light visible upon external inspection to indicate that the traffic signal control module is operating normally powered by the external AC source, and a differently coloured indicator light to indicate upon external inspection that the external AC supply is interrupted and the auxiliary power module is operating the traffic signal control system.
In one possible embodiment, the indicating means includes a remote indicating circuit automatically operative in the event of interruption of the external AC supply COMS ID No: ARCS-201380 Received by IP Australia: Time 16:49 Date 2008-08-07 07 Aug 08 04:45p 07 Rg 0 O 4 45 p3213132
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3 00 0 0 to transmit to a remote station a status signal indicating that the traffic signal control system has switched from normal operation to operation by the auxiliary power module. For example, the remote station may comprise premises of a central organisation responsible for maintenance and operation of traffic signal installations within a geographical area and where personnel can be stationed to monitor remotely thie correct functioning of numerous traffic signal control systems. The transmission of the status signal to the remote station may be carried out by any convenient 00 o technology, such as generation and transmission of the status signal on a dedicated data line connecting the traffic signal control system to the central control station, by conventional telephone line connected to the traffic signal control system and using an automatic dialler to make the connection for transmission of the status signal, by radio transmission, including transmission via a conventional mobile telephone or cell phone network.
Preferably, the auxiliary power module includes a switching means responsive to the resumption of the external alternating current supply to the traffic signal control module to disconnect power from the auxiliary power module to the traffic signal control module. The switching means may comprise a relay which has a default condition in which it connects power from the auxiliary power module to the traffic signal control module and an operating condition in which it connects the external AC supply to the traffic signal control module, the relay being operative when the external supply to the traffic signal control module is interrupted to automatically return from its operating condition to its default condition connecting the auxiliary power module to the traffic signal control module.
According to a second aspect of the invention there is provided a traffic signal power system for providing operating power to an associated traffic signal control COMS ID No: ARCS-201380 Received by IP Australia: Time (I-Pm) 16:49 Date 2008-08-07 07 Aug 08 04:45p 07 Ag 0 0 445 p3213132
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6 4 00 0 0 system normally operative upon being powered by an AC power supply, the traffic signal power system including: an inverter having an inverter input for receiving a DC supply voltage and for converting the DC voltage input to an AC output of voltage and frequency suitable for operating an associated traffic signal control systemn; switching means responsive to interruption of nonnal AC power supply to the traffic o signal control system to switch the AC output of the inverter so as to supply AC power to the traffic signal control system and maintain operation of the associated 00 o traffic lights or signals; a battery for storing power and connected so as to suapply DC power for use in maintaining operation of the associated traffic signal control system; and an external DC supply input arranged to be coupled by a electrical supply lead to an external DC source, the external DC supply input being connected to the inverter input whereby the traffic signal control system can be maintained operational by selective connection of the external DC source, Preferably, the battery is connected to supply DC power to the inverter input.
In this embodiment the external DC supply input may include a supply switch which switches the battery out of circuit and disconnects it from the inverter input when the external DC voltage source is connected to supply power to the inverter input.
In an alternative embodiment, the battery may be connected to a second inverter which is connected to operate the associated traffic signal system in parallel to, or as an alternative to, the AC output of the first inverter when powered by the external DC source.
The system preferably further includes a battery charger connected to be powered from the external AC source so as to supply a charging current to the battery to maintain it fully charged to power the traffic control system in the event of interruption of the AC supply.
COMS ID No: ARCS-201380 Received by IP Australia: Time 16:49 Date 2008-08-07 07 Aug 08 04:46p 07 lue08 64 8 p3213132 p. 7 00 0 o According to a third aspect of the invention there is provided a method of Oil) operating a traffic signal control system, the method comprising the following steps: <1 powering traffic signal control module by an external alternating current source' o providing an auxiliary power module coupled to the traffic signal control module, the auxiliary power module including an internal direct current source; providing a connection means of the auxiliary power module enabling selective connection to an o external direct current source; and powering the traffic signal control module through 0o the auxiliary power module and the connection to the external direct current source Cl when the external alternating current source is interrupted.
Further features of the present invention will become apparent from the following detailed description.
BRIEF DESCRIPTION OF THE DRAWINGS In order that the present invention may be readily understood and put into practical effect, reference will now be made to the accompanying illustrations wherein: Fig. I is an exploded view of a traffic signal control system according to one embodiment of the invention;, Fig. 2 is a perspective view of the traffic signal control system; Fig. 3 is a schematic circuit of an auxiliary power module of the traffic signal control system; Fig. 4 is a flowchart of a method of implementing the traffic signal control system.
COMS ID No: ARCS-201 380 Received by IP Australia: Time 16:49 Date 2008-08-07 07 Aug 08 04:415p 07 fug 8 044 6 p3213132 p.8 6 00 0 o DETAILED DESCRIPTION OF THE DRAWINGS Figs. 1 and 2 show a traffic signal control system 100 according to an <1 embodiment of the invention. The traffic signal control system 100 comprises a traffic o signal control module 110 and an auxiliary power module 120. In this embodiment, the auxiliary power module 120 is retro-fitted to an existing traffic signal control module 110. A cover panel 121 allows access within for maintenance and/or service O of the auxiliary module 120.
00 o The traffic signal control module 1 10 is a conventional control module that is Cl responsible for operating the traffic signals at a road intersection. The control module 110 can include a power panel for powering the overall traffic signal control system 100, a detector interface panel for detecting motor vehicles (loop detectors) and pedestrians (pedestrian crossing buttons) at the intersection, a control panel and an emergency panel for notifying local authorities of faults or disruptions in the traffic signal control system 100. The control module 110 includes access within for maintenance and/or service via a cover panel 1 11.
As the skilled addressee can appreciate, the control module 110 is powered by a conventional external alternating current (AC) source 160 namely a mains power supply. As shown in Fig. 1, cabling associated with the AC source 160, traffic light signals 161, detectors 162 and emergency communications 163 may be installed and connected underground. Alternatively, emergency communications unit 163 may be above ground if RE signalling is used.
The auxiliary power module 120 is coupled externally to the control module 110. The auxiliary module 120 includes an indicating means 123, in the form of coloured lights, for indicating the mode of the control module 1 10. In particular, the auxiliary power module includes at least one indicating means 123 operative to COMS ID No: ARCS-201380 Received by IP Australia: Time 16:49 Date 2008-06-07 07 Aug 08 04:4Gp 3213132 P.
9 7 00 0 0 indicate whether the traffic signal control module 110 is being powered by the 1) external alternating current source or by the auxiliary power module 120. The indicating means 123 is a visual indicator located at the control module so that external inspection can verify if the external AC supply is interrupted and the auxiliary power module is operating the traffic signal control system 110. One of the two visual indicators 123 is an indicator light visible upon external inspection to 0 indicate that the traffic signal control module 110 is operating normally powered by 00 Othe external AC source, and the other indicator 123 is a differently coloured indicator light to indicate upon external inspection that the external AC supply is interrupted and the auxiliary power module 123 is operating the traffic signal control system.
The indicating means 123 includes a remote indicating circuit 135 automatically operative in the event of interruption of the external AC supply to transmit to a remote station a status signal indicating that the traffic signal control system 110 has switched from normal operation to operation by the auxiliary power module 120.
Fig. 3 shows the components of an auxiliary power module 120 according to one possible embodiment of the invention. The auxiliary module 120 comprises an internal direct current (DC) source shown as battery 122, an inverter 130 and cabling 140 connecting to the traffic signal control module 110 (Figs. 1 and The inverter 130 include inputs 131 that are connected to the internal DC source 122 via electrical leads 127.
The internal direct current (DC) source 122 is a secondary or rechargeable battery. The internal DC source 122 is coupled, to the battery charger 125 that is powered by the external AC power source in a normal mode of the traffic signal control system 100 via the cabling 140. The trickle charging of the battery 122 COMS ID No: ARCS-201380 Received by IP Australia: Time 16:49 Date 2008-08-07 07 Aug 08 04:4Gp 3213132 p. 1 0 8 00 0 o maintains it fully charged to power the traffic control system in the event of interruption of the AC supply. In other embodiments, the electrical charger 125 can be powered by renewable energy source such as a solar panel, a wind turbine and the 0like.
5 The inverter 130 converts a DC power input into AC power that is I> substantially similar to the external AC source 163 that powers the traffic signal 0 control module 110 under normal operating conditions. As the skilled address can 00 O0 appreciate, the voltage and frequency produced by the inverter 130 are substantially similar to that provided by the external AC source 163.
When the AC source 163 to the traffic signal control module 110 is interrupted, a switching means 124 switches the auxiliary power module 120 into operation such that the internal DC source 122 initially powers the traffic signal control module 110 via the AC output 132 of inverter 130. As discussed earlier, the traffic signal control module 110 includes a remote indicating circuit 135 and/or emergency communications unit 163 that notifies the local authorities of faults or power interruptions to the traffic signal control module 110. Upon receiving the notification, the authorities will dispatch assistance to the reported location.
Although the internal DC source 122 is powering the traffic signal control module 110 initially, the internal DC source 122 can only maintain operation of the traffic signal control module 110 for predetermined period. The authorities are aware of this predetermined period and accordingly coordinate a planned response based on the predetermined period.
The inverter inputs 131 are coupled via an electrical lead 126, which is configured to extend and connect to an external direct current (DC) source 151. In this embodiment, the external DC source 151 is a battery of a motor vehicle 150, a DC COMS ID No: ARCS-201380 Received by IP Australia: Time 16:49 Date 2008-08-07 07 nuc 00 04:47p 3213132 P. 1 1 9 00 0 0 output of the vehicle electrical system the DC socket commonly provided in a 0 vehicle cabin), or other convenient DC power take off point or the vehicle electrical system.
0 The lead 126 is shown connected to the battery 122 terminals and thus connected to the inverter input 131 by lead 127, but lead 126 could constitute, or be connected to, a DC supply input coupled directly to the input 131.
0When assistance arrives at the reported location, the assistor opens the cover 00
OO
panel 121 of the auxiliary power module 120 and connects the electrical lead 126 to the external DC source 151, which in most cases will be a battery or other point in the electrical circuit of a motor vehicle 150. By connecting the external DC source 151 to the auxiliary power module 120, the operation of the traffic signal control module 110 can be maintained for an indefinite period by running the engine of the motor vehicle continuously.
In the preferred embodiment the auxiliary power module 120 includes the switching means 124 which is responsive to the resumption of the external alternating current supply to the traffic signal control module 110 to disconnect power from the auxiliary power module 120 to the traffic signal control module. The switching means 124 comprises a relay which has a default condition in which it connects power from the auxiliary power module 120 to the traffic signal control module 110 and an operating condition in which it connects or allows the external AC supply 160 to power the traffic signal control module 110, the relay being operative when the external supply to the traffic signal control module is interrupted to automatically return from its operating condition to its default condition connecting the auxiliary power module 120 to the traffic signal control module 110.
COMS ID No: ARCS-201380 Received by IP Australia: Time 16:49 Date 2008-08-07 07 Rug 08 04:47p 3213132 p.12 00 0 o Fig. 4 shows a flowchart according to another embodiment of the invention. In ci particular, a method of operating a traffic signal control system including a first step 210, powering traffic signal control module by an external alternating current source.
0A second step 220, providing an auxiliary power module coupled to the traffic signal 5 control module, the auxiliary power module including an internal direct current source which is switched into operation to generate AC. A third step 230, providing a 0 0connection means of the auxiliary power and making selective connection to an 00
OO
O external direct current source to supersede the battery powered operation. And, a 0 fourth step 240, powering the traffic signal control module through the auxiliary power module and the connection to the external direct current source when the external alternating current source is interrupted.
As an alternative (not shown) to the illustrated embodiment, the external DC supply input may include a supply switch which switches the battery 122 out of circuit and disconnects it from the inverter input 131 when the external DC voltage source 151 is connected to supply power to the inverter input.
As another alternative (not shown) to the illustrated embodiment, the battery 122 may be connected to a second inverter which is connected to operate the associated traffic signal system 110 in parallel to, or as an alternative to, the AC output 132 of the first inverter 130 when powered by the external DC source 151.
The present invention provides an alternative to the present art relating to traffic signal controller systems. Although the embodiments of the present invention have been directed to traffic signal controllers for motor vehicles and road intersections, the present invention could also easily be adapted for use in traffic signal controllers for aircraft, shipping vessels and railroad networks. Furthermore, other embodiments of the present invention could include the auxiliary power module COMS ID No: ARCS-201380 Received by IP Australia: Time 16:49 Date 2008-08-07 07 Aug 06 04:47p 3213132 p.
1 3 11 0 O being integrated within a traffic signal control module, instead of retro-fitted as herein described.
The major advantage of the present invention is the simplicity of maintaining 0 or reactivating a traffic signal controller without the need of high level training. As such, the present invention is highly suited to be actuated by police officers, fireman, Imedical emergency or other emergency service personnel, or traffic signal controller 0technicians.
00 OThroughout the description and claims of this specification, the word "comprise" and variations of that word such as "comprises" and "comprising", are not intended to exclude other additives, components, integers or steps.
It is to be understood that various alterations, modifications and/or additions may be made to the features of the possible and preferred embodiment(s) of the invention as herein described without departing from the spirit and scope of the invention.
COMS ID No: ARCS-201380 Received by IP Australia: Time 16:49 Date 2008-08-07
Claims (10)
1. A traffic signal control system comprising: a traffic signal control module powered by an external alternating 0 current source; and an auxiliary power module having an internal direct current source and coupled to the traffic signal control module to selectively power it, the 0 auxiliary power module configured to be selectively connected to an external 00 O direct current source via an electrical lead; wherein the traffic signal control module is configured to be powered by the auxiliary power module and selectively by the external direct current source when the external alternating current source is interrupted.
2. The traffic signal control system as claimed in claim 1, wherein the external direct current source is a DC electrical supply of a motor vehicle.
3. The traffic signal control system as claimed in claim I or 2, wherein the auxiliary power module includes at least one indicating means operative to indicate whether the traffic signal control module is being powered by the external alternating current source or by the auxiliary power module.
4. The traffic control system as claimed in claim 3 wherein the indicating means is a visual indicator located at the control module so that external inspection can verify if the external AC supply is interrupted and the auxiliary power module is operating the traffic signal control system. A traffic control system as claimed in claim 4 wherein the visual indicator includes an indicator light visible -upon external inspection to indicate that the traffic signal control module is operating normally powered by the external AC source, and a differently coloured indicator light to indicate upon external COMS ID No: ARCS-201 380 Received by IP Australia: Time (I-tm) 16:49 Date 2008-08-07. 07 nug 00 04:48p 3213132 13 00 0 inspection that the external AC supply is interrupted and the auxiliary power cl ;module is operating the traffic signal control system.
6. The traffic signal control system as claimed in claim 3, 4 or 5 wherein the indicating means includes a remote indicating circuit automatically operative in the event of interruption of the external AC supply to transmit to a remote station a status signal indicating that the traffic signal control system has 0switched from normal operation to operation by the auxiliary power module. 00 S7. The traffic signal control system as claimed in any preceding claim 1, wherein the auxiliary power module includes a switching means responsive to the resumption of the external alternating current supply to the traffic signal control module to disconnect power from the auxiliary power module to the traffic signal control module.
8. The traffic signal control system as claimed in claim 7 wherein the switching means comprises a relay which has a default condition in which it connects power from the auxiliary power module to the traffic signal control module and an operating condition in which it connects the external AC supply to the traffic signal control module, the relay being operative when the external supply to the traffic signal control module is interrupted to automatically return from its operating condition to its default condition connecting the auxiliary power module to the traffic signal control module.
9. A traffic signal power system for providing operating power to an associated traffic signal control system normally operative upon being powered by an AC power supply, the traffic signal power system including: COMS ID No: ARCS-201380 Received by IP Australia: Time 16:49 Date 2008-08-07 07 Aug 08 04:40p 07 lue08 04 8 p3213132 P. 1 6 14 00 Cl an inverter having an inverter input for receiving a DC supply voltage ;Z and for converting thc DC voltage input to an AC output of voltage and frequency suitable for operating an associated traffic signal control system; switching means responsive to interruption of normal AC power supply to the traffic signal control system to switch the AC output of the S inverter so as to supply AC power to the traffic signal control system and maintain operation of the associated traffic lights Or signals; 00 0~ battery for storing power and connected so as to supply DC power for use in maintaining operation of the associated traffic signal control system; and an external DC supply input arranged to he coupled by a electrical supply lead to an external DC source, the external DC supply input being connected to the inverter input whereby the traffic signal control system can be maintained operational by selective connection of the external DC source. The traffic signal power system as claimed in claim 9 wherein the battery is connected to supply DC power to the inverter input.
11. The traffic signal power system as claimed in claim 10 wherein the external DC supply input includes a supply switch which switches the battery out of circuit and disconnects it from the inverter input when the external DC voltage source is connected to supply power to the inverter input.
12. The traffic signal power system as claimed in claim 9 wherein the battery is connected to a second inverter which is connected to operate the associated traffic signal system in parallel to, or as an alternative to, the AC output of the first inverter when powered by the external DC source. COMS ID No: ARCS-201 380 Received by P1 Australia: Time 16:49 Date 2008-08-07 07 AuG 08 04:40p 07Ag 9O 4 4 p m 3213132 p1 p. 17 00 0 O13. A system as claimed in any one of the preceding claims and further including Oil) a battery charger connected to be powered from the external AC source so as <1 to supply a charging current to the battery to maintain it fully charged to 0 power the traffic control system in the event of interruption of the AC supply. A system as claimed in any one of the preceding claims and substantially as
17- herein before described with particular reference to the accompanying 0 drawings. 00 A method of operating a traffic signal control system, the method comprising the following steps: powering traffic signal control module by an external alternating current source; providing an auxiliary power module coupled to the traffic signal control module, the auxiliary power module including an internal direct current source; providing a connection means of the auxiliary power module enabling selective connection to an external direct current source; and powering the traffic signal control module through the auxiliary power module and the connection to the external direct current source when the external alternating current source is interrupted. 16. A method as claimed in claim 15 and substantially as herein before described with particular reference to the accompanying drawings. COMS ID No: ARCS-201 380 Received by IP Australia: Time 16:49 Date 2008-08-07
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2008100741A AU2008100741A4 (en) | 2008-08-07 | 2008-08-07 | A traffic signal control system and method |
| NZ57881509A NZ578815A (en) | 2008-08-07 | 2009-07-31 | A traffic signal control system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2008100741A AU2008100741A4 (en) | 2008-08-07 | 2008-08-07 | A traffic signal control system and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU2008100741A4 true AU2008100741A4 (en) | 2008-09-11 |
Family
ID=39748582
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2008100741A Expired AU2008100741A4 (en) | 2008-08-07 | 2008-08-07 | A traffic signal control system and method |
Country Status (2)
| Country | Link |
|---|---|
| AU (1) | AU2008100741A4 (en) |
| NZ (1) | NZ578815A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2017203721B2 (en) * | 2010-01-25 | 2019-01-31 | Aldridge Traffic Controllers Pty Ltd | Traffic signal controller system and method |
| CN111624899A (en) * | 2020-06-30 | 2020-09-04 | 核工业理化工程研究院 | Multi-mode control system and control method thereof for large-scale system |
-
2008
- 2008-08-07 AU AU2008100741A patent/AU2008100741A4/en not_active Expired
-
2009
- 2009-07-31 NZ NZ57881509A patent/NZ578815A/en not_active IP Right Cessation
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2017203721B2 (en) * | 2010-01-25 | 2019-01-31 | Aldridge Traffic Controllers Pty Ltd | Traffic signal controller system and method |
| CN111624899A (en) * | 2020-06-30 | 2020-09-04 | 核工业理化工程研究院 | Multi-mode control system and control method thereof for large-scale system |
Also Published As
| Publication number | Publication date |
|---|---|
| NZ578815A (en) | 2010-07-30 |
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| AMFD | Amendment of filing date | ||
| FGI | Letters patent sealed or granted (innovation patent) | ||
| MK22 | Patent ceased section 143a(d), or expired - non payment of renewal fee or expiry |