DE2719675C3 - - Google Patents

Description

The invention relates to a method for monitoring the functionality of the traffic lights of a radio-controlled Verkehrsampclsystems with more than two traffic lights, the system with a central one Control device that has at least one radio transmitter to start a timing in each one with a Radio receiver provided with traffic lights is equipped.

With a radio-controlled traffic light system, it is necessary to check the functionality of each individual traffic light as quickly as possible and in the Adjust the entire system accordingly in the event of a malfunction.

From DE-GM 18 Il 742 a traffic light has become known, which in its functional sequence is operated remotely by means of electromagnetic waves. The sciider, which the phase sequence - red - yellow - Green controls, is carried and operated by an operator. This system is limited applicable and does not allow the functionality of the traffic lights to be checked in a traffic light system.

It is also known (Techn. Zentralblatt 1960 / Elektro, p. 1921), one consisting of more than two traffic lights Traffic light system in relation to the phase sequence - red - yellow - green - from a central control device to control. This facility only initiates the functional sequence of each individual traffic light, but monitors it Functional sequence not working properly.

It is known for a remote-controlled traffic light construction (see »Road Traffic Technology«, Issue 2/1973 / P. 65) to provide a Ro'.lichtmonitoring in such a way that the glow surfaces in the lamps of the red The stop signal can be monitored continuously, even when it is switched off. This construction is used on construction sites with two traffic lights. At a Interruption switches the Gegenampcl to a red stop signal. The same security is provided, though the downshift from "green" did not work properly.

The system works with an acknowledgment signal from the receiver to the transmitter traffic light,

Furthermore, a traffic light system with two traffic lights is known (see "Verkehr und Technik", 1976, No. 10, P. 399-401), each traffic light with a double radio path equip.

The present invention has the task for a radio-controlled traffic light system a surveillance procedure with more than two traffic lights

to develop with the constant functionality

every single traffic light is checked and in the event of a malfunction that entire traffic light system converted to this SlOrFaII can be.

To solve this problem, according to the invention

suggested that the traffic lights one after the other via radio transmitter to a radio receiver of the central Notify the control unit of their undisturbed state, and between the notification of two successively there is a fixed gap in the signaling traffic lights, and in the event of a malfunction from the disturbed traffic light Utilizing the gap, the remaining traffic lights can be switched over to faults at the same time via radio.

An expedient development of the invention provides also before that in the case of a transmission and reception ability of a traffic light of the common recipient Notifies all traffic lights of the incident

The invention is further expediently developed in that the sum of the loan time every traffic light to the lonely recipient and off

JO of the radio gap a maximum of 300 msec. amounts to. The same applies in the event that the joint recipient receives the Takes over the task of a traffic light that is unable to transmit or receive.

The advantages achieved with the invention

consist in that this process technology at both stationary as well as mobile traffic light systems can be used, and in all cases the safety requirements are fully met.

• 40 A particular advantage is the fact that with If a stationary traffic light system fails completely, it can be replaced by a mobile one as quickly as possible can without neglecting the safety requirements.

The method according to the invention is described in more detail below; the functional sequence illustrate the in the F i g. I to 3 shown drawings.

The central receiving and transmitting station, hereinafter referred to as the control unit, and every single traffic light of the

so systems have a radio transmitter and a radio receiver. After switching on the traffic lights all traffic lights expect a special radio command from the central control unit. With this command a time sequence begins in each individual traffic light.

At a time programmed differently for each traffic light within this time sequence, the The radio transmitter of the traffic light concerned is activated and sends a coded acknowledgment signal to the central Control unit back. The coded acknowledgment signal contains the information that the radio transmitter and the

The traffic light radio receiver is working correctly. the

temporal length of the acknowledgment signal is /. B.

100 msec.

The times of the programmed in each traffic light

β ¹ ; Scanning of the acknowledgment signal are selected so that the central control unit receives a chain of acknowledgment signals, which every / .. B. 100 msec. are long and / wipe each of them a radio gap of also /. U.

IQQ msec. lies.

The number of traffic lights in a system whose The central control unit has to receive acknowledgment signals, is preselected with a switch on this After the central control unit has received the acknowledgment signal 5 from all traffic lights, it sends another one Command that starts the timing in the individual traffic lights. The process repeats itself.

If the radio transmitter of a traffic light fails or the receiver of the traffic light could the start impulse from to central control unit is not received and therefore the timing in the traffic light does not start properly, then the central control unit registers the failure of the acknowledgment signal. It now uses those immediately the following radio gap from e.g. lOOmselc to a transmit a sustained emergency signal by radio to all other traffic lights. This distress signal switches everyone The traffic lights change to the incident.

If there is a malfunction in a traffic light, the transmitter of this traffic light immediately emits a sustained emergency signal the end. In the worst case, this radio emergency signal can be timed exactly with that in this one Momentary transmitted acknowledgment signal from another traffic light coincide, but because the acknowledgment signal only for e.g. max. 100msec is sent the emergency signal in the after these 100 msec. following loophole free access to the recipients of everyone else Traffic lights and causes the switch to malfunction.

The possibility that a traffic light can send out its emergency signal even if it is from the power source has been separated, was created by the fact that each traffic light has an internal emergency battery, which ensures the power supply of the radio transmitter even if there is an external power source should have failed.

Using this method, it is possible to constantly monitor a radio-controlled traffic light system and a changeover of all traffic lights in the event of a fault within a maximum of 300 msec. to reach.

For this purpose 3 sheets of drawings

Claims (3)

Claims; 1. Procedure for monitoring the functional volatility of the traffic lights of a radio-controlled Traffic light system with more than two traffic lights, whereby the system with a central control unit, which contains at least one radio transmitter for starting a time sequence in each individual traffic light provided with a radio receiver, is equipped, characterized in that the traffic lights one after the other via radio transmitter to a radio receiver of the central control unit their undisturbed Communicate status, and one time between the notification of two consecutive traffic lights defined gap is, and in the event of a malfunction from the disturbed traffic light using the gap over Radio the other traffic lights can be switched to malfunction at the same time. 2. The method according to claim 1, characterized in that in the event of a transmission and reception inability of a traffic light, the common receiver notifies the Störfau of all traffic lights. 3. The method according to claims I or 2, characterized in that the sum of the Notification time of each traffic light to the common recipient and from the radio gap maximum 300 msec. amounts to.