DE2737200C2 - Program control device for laundry treatment machines and / or dishwashers - Google Patents

Description

The invention relates to a program control device for laundry treatment machines and / or dishwashers with a stepping mechanism controlling the program sequence of the machine, which during of the program sequence processes a time-dependent and / or physical state-dependent sequence of steps.

While the program is running in the aforementioned household appliances, there are certain program breaks at on which a control function that is dependent on a physical state is overlaid with a temporal one (German Eiektrohandwerk38, 1963, issue 20, pp. 694-697).

So z. B. in washing machines and dishwashers assumed to be known, the treatment temperature monitored by a thermostat, the switching of which switches on when the corresponding temperature is reached This temperature-dependent program step is initiated in the next program step then a temporal signal is superimposed to be on the safe side, so that the machine does not operate “infinitely” can be used if the pre-programmed temperature is not reached due to malfunctions

Similarly, in a program sequence in washing machines and dishwashers, further program steps are usually provided in which time-dependent control functions and control functions dependent on physical states can be superimposed.
In the controls described above, z. B. result in a disadvantage if, in a temperature and time-controlled program step, the temperature of the detergent solution reaches the preset temperature value very early due to certain circumstances and thus the temperature signal causes switching to the next program step. In washing machines and dishwashers, this control can result in too short a washing mechanical action time on the items to be treated, which then leads to unsatisfactory washing and rinsing results.

From DE-OS 17 10 538 there is an arrangement for controlling washing programs in washing or Dishwashers described in which a main program can be supplemented by an additional program at given times. However, two special program switching mechanisms are necessary for this, which is a significant taxation of this control has the consequence. In addition, with this arrangement there is only one To achieve addition of a main program with an additional program.

The invention is based on the object of the program control device of the type mentioned so to develop that there is an advantageous mode of operation compared to the known, however, after a Time and state-dependent program step the actually occurred from a physical state dependent control sequence is taken into account.

The solution to this problem is achieved by the features characterized in the claim.

The measure according to the invention is used in an advantageous manner, in particular, in a program control device in which an indexing mechanism receives its switching step commands from an electronic control mechanism. A particular advantage can be seen in the fact that an unused time of the previous switching step is processed if this appears expedient or necessary.
Means of the following function table which represents a program excerpt from a _Waschr: aschinenprogramm represent two application examples of the invention will be explained.

I: prewash

Step No. Operation Step control by: Duration

3 washing movement + heating timer and thermostat 15 '

4 Washing movement timer remaining time off

Step 3 (0-15 ')

so II: spin

Step No. Operation Step control by: Duration

50 Spin cycle timer and imbalance switch 4.5 '
1000 rpm + pump down

51 Spin cycle timer off for remaining time

800 rpm + pump down step 50 (0-4.5 ')

Supplementary sheet to patent specification 27 37

I 'Int. CL: D 06 F 33/02

Release date: March 13, 1986

25 Add description to page 2 between lines 25 and 26:

It is also known (ÜE-AS 14 85 003, DE-PS 4 85 007), either a sufficient number of time steps to be provided for the main wash cycle within the temperature-monitored program section or additionally to sequence a predetermined number of time steps after the thermostop step in order to achieve a sufficient number of times to be able to take a long post-wash time into account.

40 45 50

60

Function table I shows extracts of the pre-wash program section, in the program step No. 3, the drum of the washing machine is intermittently moved, and the radiators are turned on This program step is monitored by the preset thermostat and the Time signal of the timer made. If the preselected temperature is reached within the time limit of 15 minutes reached, the thermostat sends a control command to a step-by-step switch, which in the program step No. 4 runs In this program step, in the not yet expired time from step 3 the Washing movement continued without heating In this program step, the remaining time is taken from the previous step processed

If the temperature is not reached within the time limit of step 3, the program step becomes No. 4 reduced to a comparatively very short time or driven over directly. ι ο

Function table II shows the Spin program section.

In program step no. 50, the spin motor brings the washing drum to 1000 o '/ min. Runs at the same time the drain pump to pump out the extracted water.

This program step is determined by the timer (4.5 minutes) if the system is operating correctly. Should At the high spin speed, however, inadmissibly high unbalance vibrations occur, the unbalance switch can are excited, which then causes the transition to the next step 51 This program step is then programmed with a reduced spin speed (e.g. 800 rpm) at which the unacceptably high unbalance loads cannot occur. The spin cycle will be with the remaining one Time from step 50 and the reduced spin speed to the end

Claims (1)

Claim: Program control device for laundry treatment machines and / or dishwashers with one The program sequence of the machine controlling the stepping mechanism, which during the program sequence a processes time-dependent and / or physical states-dependent sequence of steps, characterized in that that a program step that is triggered by a status command as well as by a superimposed time command is determined, a pure time step is sequenced in which the eventual from the previous program step due to premature arrival of the status command time not expired is added, while in the absence of the status command, this sequential switching step is added to an opposite one the remaining time steps, the very short time is reduced or exceeded directly.