DE3018219A1 - Electronic parking time indicator - has clock oscillator and three stage decade counter with display - Google Patents

Abstract

The electronic parking disc indicates parking time in minutes, regardless of the time of the day and may comprise integrated circuits or discrete circuit elements. An I.C.- clock oscillator is connected so as to generate one minute pulses. These pulses clock a three stage decade counter counting ones, tens and hundreds input pulses up to a maximum of 199 minutes. The counters are connected to an l.e.d. or, for economy, and l.c.d. display. An additional combinational logic stops the oscillator (2240/10-1) and resets the counter (4026/15-1). Switching off the ignition starts the oscillator (2240/10-0) and enables the counter (4026/15-0).

Description

-Automatic parking disc for motor vehicles The invention relates to an automatic parking disc for motor vehicles.

It is necessary because of the sudden increase in motor vehicle traffic The parking times have become, on bestlmm ', t'en parking lots, preferably in the town centers to limit. As far as paid parking meters are set up in a parking lot are, compliance with the prescribed maximum parking times with so-called Parking discs awake.

Known parking disks consist of a manually adjustable round Dial, which is rotatably mounted in a rectangular housing. In the The housing has a window through which part of the dial is visible. Turn the dial to set the time at which parking begins. This point in time can be read through the housing window. In practice, up to Today parking time controls carried out with the facility described above. About that In addition, however, electrical-mechanical parking disks are also known which are set automatically.

In this context, reference is made to the Italian patent application v. 16.3.78 No. 26 41 081 referenced.

Herein is an electromechanical parking start display device which is connected to a timer 0 Every time the vehicle door is opened a display device is electromechanical via the switching contact for the interior lighting set to the respective time.

This facility, which is already fully automatic, has opposite the conventional parking disc described first has the advantage that the annoying Setting by hand is not necessary and therefore cannot be leased out (unnecessary Traffic tickets are already avoided 90); however, it still has the following disadvantages an: 10 The electromechanical working method with moving parts. Mechanically working Devices have the disadvantage that they a) require a relatively large amount of space, b) are relatively susceptible to failure and repair; , a) natural wear and tear of the movable ones Parts are subject to and d) are relatively complex and therefore expensive to produce0 2. Only the beginning of the parking time is displayed, but not the one since the beginning the parking time, minutes elapsed, to be able to determine how long a vehicle has been has already been switched off9 a timer must be available.

The invention is based on an automatic, electronic Parking disc (without mechanically moving parts) available) at which the already elapsed parking time can be read directly, without comparison with a timer can be.

According to the invention, this object is achieved by d, ate the parking disc consists of a fully electronic circuit arrangement with display elements, which shows the elapsed parking time since the start of parking in minutes.

This circuit arrangement can be made up of individual modules composite discrete circuit or a one-chip integrated circuit.

The advantages achieved with the invention. consist in that instead of a complicated, fault-prone and outdated mechanical device an electronic circuit is used. This electronic circuit is with the help of a printed circuit board in a simple manner with standard components of the electronics industry. This in particular results in the advantages a) a small space requirement, b) a low disturbance u.

Susceptibility to repair, c) almost no wear and tear, d) inexpensive mass producibility.

These advantages will become apparent when the Demand should reach an order of magnitude that the production of this circuit as a one-chip IC. As is known, the transmission implies a known discrete Switching into a new one-chip IC entails an enormous amount of work and costs Preliminary work ahead. Whether this circuit can now be implemented as a one-chip IC or not, depends solely on the later demand for electronic Parking disks, as this effort is only possible with a corresponding number of pieces is justified.

Another advantage arises from the fact that the length of the already Elapsed parking time can also be determined if no clock is available stands because at any point in time the number of minutes that have elapsed since parking began is shown.

One embodiment is described as follows: An IC clock oscillator is connected externally with an RC element in such a way that a clock pulse at the output every minute is delivered. This clock pulse is applied to the counting input of a three-stage (ones / tens / hundreds) IC decimal counter switched, which counts the input pulses up to max. 199 (minutes) and the respective counter reading via the connected display elements The rest of the external wiring is in accordance with the information provided by the IC manufacturer executed. The above circuit is controlled by an additional one Gate and relay circuit according to drawing Z 1 in the following way: Switching on the ignition causes the oscillator to be stopped 9 ai, e display elements switched off and the counter is reset to zero. Switching off the ignition has the consequence that the oscillator is set in motion, the display elements are switched on and the counter is released. Now the circuit works until it is reached the 200th minute = (200th clock pulse) or until the ignition is switched on again0 The 200.

Clock pulse causes the clock oscillator and the display elements to be stopped 0 Only when the device is switched on again (reset the counter to Zero) and turning off the ignition, the circuit starts working again Switching off the display elements is for LED display elements to limit the Electricity consumption provided. This can be dispensed with when using LCD display elements Be0 In addition, the entire circuit can be switched off with a switch are9 if a vehicle is not used for a longer period (one or more weeks) shall be. Through the power consumption (when the LED display elements are switched on approx. 30 mA, when the LED display elements are switched off approx. 5 mA) is a car battery not significantly burdened 4 The type details given in drawing Z 1 and terminal designations refer to what is used in a prototype Components. These types are basically distinguished by others of the same type or similar Replaceable components. If the economic conditions described above are given, oscillator function, counter function as well as gates and possibly also the relay function on a bin-chip IC can be considered.

Refer to the connection designations given in drawing Z 1 on the components used in the prototype (the connections are an exception Z and + - 5 V) and have the following meaning: 4026/3 = IC CD 4026 connection 3 one signal at connection 3 = LED display a zero signal at connection 3 = LED display from 4026/15 = IC CD 4026 connection 15 one signal at connection 15 = counter on zero zero signal at connection 15 = counter works 4026/14 = IC CD 4026 connection 14 (only 3rd level) At the 200th clock pulse, terminal 14 of the 3rd stage switches from a binary signal to a zero signal 2240/10 = IC XR 2240 connection 10 one-signal on, connection 10 = clock oscillator stops Zero signal at connection 10 = "works 2240/11 = IC XR 2240 connection 11 one signal at connection 11 = clock pulse works zero signal at connection 11 = "stops Z = vehicle ignition (or if necessary, also door contact switch for the interior lighting)

Claims (2)

Claims: Automatic parking disc for motor vehicles9 thereby characterized9 that the parking disc from a fully electronic circuit arrangement with display elements that show the parking time that has already elapsed since the start of parking shows in minutes 2. Automatic parking disc for motor vehicles9 characterized that the circuit arrangement is composed of individual components discrete circuit or a one-chip integrated circuit0