CN1919135B - Door cover detection circuit and door cover detection method - Google Patents
Door cover detection circuit and door cover detection method Download PDFInfo
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- CN1919135B CN1919135B CN2005100929911A CN200510092991A CN1919135B CN 1919135 B CN1919135 B CN 1919135B CN 2005100929911 A CN2005100929911 A CN 2005100929911A CN 200510092991 A CN200510092991 A CN 200510092991A CN 1919135 B CN1919135 B CN 1919135B
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Abstract
The invention discloses a lid detecting circuit and detecting method, which comprises the following parts: single-chip machine, which contains two inputs and outputs to connect, switch, which is connected among input, output and high-potential, pulling resistance, which is connected between two connecting points and zero potentials. When the switch is broken, it supplies low-level signal to single-chip machine. When the switch is closed, it provides high-level signal to single-chip machine. The invention also discloses a lid detecting circuit and detecting method, which comprises the following parts: single-chip machine, which contains two inputs and outputs to connect, switch, which is connected among input, output and high-potential, pulling resistance, which is connected between two connecting points and zero potentials. When the switch is broken, it supplies high-level signal to single-chip machine. When the switch is closed, it provides low-level signal to single-chip machine.
Description
Technical field
The present invention relates to a kind of control circuit and door cover detection method of door closure, the control circuit and the door cover detection method that relate to household electrical appliance door closures such as a kind of washing machine or dish-washing machine specifically, when the door closure of washing machine or dish-washing machine was opened, these apparatus and method are used to stop because the malfunctioning operation that causes washing machine or dish-washing machine of maloperation or control device.
Background technology
Existing washing machine, dish-washing machine or dryer etc. all have the door closure detection port, after door closure was opened or closed, program can be handled as required accordingly, for example, during laundry machine dehydration, door closure is opened, and program detects door closure and opens, and single-chip microcomputer sends control instruction, then stop motor-driven immediately, and the release tractor, and the locking motor, avoid having an accident; After the dryer door closure is opened, stop heating immediately, effectively minimizing accident; After the dish-washing machine door closure is opened, stop washing, avoid water to overflow etc.
Above-mentioned detection door closure is to use the IO mouth of a single-chip microcomputer.Because the door closure switch is installed on the body of equipment, is not in the circuit board, causes the damage of IO mouth easily.Like this, make under the situation that an IO mouth breaks down, can not reliable detection to the folding of door closure.
Chinese patent application numbers 99121699.7, publication number CN 1261634A discloses a kind of safety device of door opening operation of washing machine, when door of washing machine is opened, door is opened detecting unit out-put supply shutoff signal and door opening signal, control module is exported another dump signal, the dump signal of opening detecting unit from control module or door makes power switching unit work cut off the washing machine power supply, in the washing machine course of work, as long as door one is opened, even control module does not send the dump signal, also can open detecting unit and export a dump signal by door, make motor out of service, thereby when door is opened, prevent drive motors in advance owing to the malfunctioning or maloperation of control module.When door closure is opened, power supply is forced to disconnect, thereby cut-out load, the problem of its solution mainly is the power supply that how to cut off load circuit, force deenergization at any time, this is to cause damage to system in the system of many more complex functions, for example in the frequency conversion system, if disconnect the clutch tractor during dehydration, and do not disconnect the power supply of variable frequency drives this moment, so motor is still changeing, this moment, the damage to mechanical part was very serious. when serious in addition can cause cracked, the injury that brings the person.
Summary of the invention
The technical problem that the present invention solves provides a kind of testing circuit of door closure, realizes the dual reliable detection to door closure.
Technical scheme of the present invention is as follows:
A kind of door cover detection circuit comprises:
Single-chip microcomputer, described single-chip microcomputer comprises at least two input/output ports, first input/output port is connected with second input/output port;
Switch is connected between described first input/output port, described second input/output port and the high potential;
Pull down resistor is connected between the tie point and zero potential of described first input/output port, described second input/output port, when switch disconnects, provides low level signal to described single-chip microcomputer, when switch closure, provides high level signal to described single-chip microcomputer.
Door cover detection circuit according to claim 1 is characterized in that, also comprises:
First isolation resistance is connected between described pull down resistor and described first input/output port, prevents that interfering signal from directly entering described single-chip microcomputer;
Second isolation resistance is connected between described pull down resistor and described second input/output port, prevents that interfering signal from directly entering described single-chip microcomputer.
Described door cover detection circuit also comprises current-limiting resistance, is connected between described switch and the high potential, is used to prevent that big electric current from flowing into described single-chip microcomputer.Described pull down resistor comprises: first pull down resistor, be connected between the tie point and zero potential of described input/output port, and when switch disconnects, provide low level signal to described single-chip microcomputer, when switch closure, provide high level signal to described single-chip microcomputer; Second pull down resistor is connected between described another input/output port and the zero potential, when switch disconnects, provides low level signal to described single-chip microcomputer, when switch closure, provides high level signal to described single-chip microcomputer.
The technique effect that the present invention brings is: after being provided with pull down resistor, first pull down resistor, second pull down resistor, the input/output port of single-chip microcomputer can receive the level signal of variation reliably.First isolation resistance, second isolation resistance prevent that interfering signal from directly entering described single-chip microcomputer, also play metering function simultaneously, prevent that big electric current from flowing into single-chip microcomputer, causes the damage of single-chip microcomputer.
Another kind of door cover detection circuit of the present invention comprises:
Single-chip microcomputer, described single-chip microcomputer comprises at least two input/output ports, the 3rd input/output port is connected with the 4th input/output port;
Switch is connected between described the 3rd input/output port, the 4th input/output port and the zero potential;
Pull-up resistor is connected between the tie point and high potential of described the 3rd input/output port, the 4th input/output port, when switch disconnects, provides high level signal to described single-chip microcomputer, when switch closure, provides low level signal to described single-chip microcomputer.
Pull-up resistor is connected between the tie point and high potential of described the 3rd input/output port, the 4th input/output port, when switch disconnects, provides high level signal to described single-chip microcomputer, when switch closure, provides low level signal to described single-chip microcomputer.
The technique effect that the present invention brings is: after being provided with pull-up resistor, first pull-up resistor, second pull-up resistor, the input/output port of single-chip microcomputer can receive the level signal of variation reliably.The 3rd isolation resistance, the 4th isolation resistance prevent that interfering signal from directly entering described single-chip microcomputer, also play metering function simultaneously, prevent that big electric current from flowing into single-chip microcomputer, causes the damage of single-chip microcomputer.
The invention also discloses a kind of door cover detection method, comprising:
(1) the A point detects the disconnection of door closure state, and described A point comprises the input signal detection point of first input/output port in the pull-down door cover detection circuit, or the input signal detection point of the 3rd input/output port in the pull-up door cover detection circuit;
(2) the disconnection detection number of times adds up;
(3) the disconnection detection number of times reaches rated value;
(4) the set door closure disconnects sign;
(5) if the disconnection detection number of times does not reach rated value;
(6) the B point detects the disconnection of door closure state, and described B point comprises the input signal detection point of second input/output port in the pull-down door cover detection circuit, or the input signal detection point of the 4th input/output port in the pull-up door cover detection circuit;
(7) the disconnection detection number of times adds up;
(8) the disconnection detection number of times reaches rated value;
(9) the set door closure disconnects sign.
Step (1) also comprises:
(a) if detecting the door closure state, the A point do not disconnect;
(b) disconnection detection number of times and zero clearing;
(c) execution in step (6).
Step (6) also comprises:
(d) if detecting the door closure state, the B point do not disconnect;
Whether (e) detect A point door closure state closes;
(f) if A point door closure closes;
(g) remove door closure and disconnect sign, execution in step (1);
(h) if A point door closure does not close execution in step (1).
Technique effect of the present invention is, realizes the dual reliable detection to the door closure state, and makes single-chip microcomputer export control signal reliably, guaranteed the safe operation and the safe handling of the household electrical appliance of washing machine, dish-washing machine or dryer etc.
Description of drawings
Fig. 1 is the door cover detection circuit figure of one of pull-down embodiment;
Fig. 2 is two door cover detection circuit figure of pull-down embodiment;
Fig. 3 is three door cover detection circuit figure of pull-down embodiment;
Fig. 4 is four door cover detection circuit figure of pull-down embodiment;
Fig. 5 is five door cover detection circuit figure of pull-down embodiment;
Fig. 6 is the door cover detection circuit figure of one of pull-up embodiment;
Fig. 7 is two door cover detection circuit figure of pull-up embodiment;
Fig. 8 is three door cover detection circuit figure of pull-up embodiment;
Fig. 9 is the flow chart of door cover detection method.
The specific embodiment
The invention discloses door cover detection circuit and be solidificated in the interior door cover detection method of single-chip microcomputer, by opening of reliable detection door closure, by single-chip microcomputer detected door closure data are judged, and sent actuating signal to the movement device of household electrical appliance such as washing machine or dish-washing machine.Be damaged or during short circuit, still can detect opening and closing of door closure as an input/output port.If an input/output port can not be worked, then program can be reported to the police, and prevents accident or causes the damage of household electrical appliance.
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described in detail.
Fig. 1 is the door cover detection circuit figure of one of pull-down embodiment, and this preferred embodiment single-chip microcomputer comprises at least two input/output ports, and first input/output port 1 is connected with second input/output port 2.Switch 3 is connected between input/output port and the high potential.Pull down resistor 4 is connected between the tie point and zero potential of input/output port 1 and input/output port 2, when switch disconnects, provides low level signal to single-chip microcomputer, when switch closure, provides high level signal to single-chip microcomputer.
During normal the use, the state of switch 3 is for disconnecting, and when switch 3 disconnected, the signal that is input to single-chip microcomputer is dragged down was low level, and after switch 3 closures, the signal transition that then is input to single-chip microcomputer is a high level.Pull down resistor 4 is got 1K ohm usually between 10K ohm.
Fig. 2 is two door cover detection circuit figure of pull-down embodiment, with reference to Fig. 2 the preferred embodiments of the present invention is described in detail.
This preferred embodiment single-chip microcomputer comprises at least two input/output ports, and first input/output port 1 is connected with second input/output port 2.Switch 3 is connected between input/output port and the high potential.Pull down resistor 4 is connected between the tie point and zero potential of input/output port 1 and input/output port 2, when switch disconnects, provides low level signal to single-chip microcomputer, when switch closure, provides high level signal to single-chip microcomputer.First isolation resistance 5 is connected between the pull down resistor 4 and first input/output port 1, prevents that interfering signal from directly entering described single-chip microcomputer; Second isolation resistance 6 is connected between the pull down resistor 4 and second input/output port 2, prevents that interfering signal from directly entering described single-chip microcomputer.Simultaneously, first isolation resistance 5, second isolation resistance 6 also play current limliting, prevent that big electric current from flowing into single-chip microcomputer, causes the damage of single-chip microcomputer.
During normal the use, the state of switch 3 is for disconnecting, and when switch 3 disconnected, the signal that is input to single-chip microcomputer is dragged down was low level, and after switch 3 closures, the signal transition that then is input to single-chip microcomputer is a high level.Pull down resistor 4 is got between 1 kilohm to 10 kilohms usually.First isolation resistance 5, second isolation resistance 6 are got 100 ohm between thousands of ohms.
Fig. 3 is three door cover detection circuit figure of pull-down embodiment, and this preferred embodiment single-chip microcomputer comprises at least two input/output ports, and first input/output port 1 is connected with second input/output port 2.Switch 3 is connected between input/output port and the high potential.Pull down resistor 4 is connected between the tie point and zero potential of input/output port 1 and input/output port 2, when switch disconnects, provides low level signal to single-chip microcomputer, when switch closure, provides high level signal to single-chip microcomputer.Current-limiting resistance 7 is connected between switch 3 and the high potential, is used to prevent that big electric current from flowing into described single-chip microcomputer.
During normal the use, when switch 3 disconnected, the signal that is input to single-chip microcomputer is dragged down was low level, and after switch 3 closures, the signal transition that then is input to single-chip microcomputer is a high level.Pull down resistor 4 is got between 1 ohm to 10 ohm usually.
Fig. 4 is four door cover detection circuit figure of pull-down embodiment, with reference to Fig. 4 the preferred embodiments of the present invention is described in detail.
The single-chip microcomputer of this preferred embodiment comprises at least two input/output ports, and first input/output port 1 is connected with second input/output port 2.Switch 3 is connected between input/output port and the high potential.Pull down resistor 4 is connected between the tie point and zero potential of input/output port 1 and input/output port 2, when switch closure, provides high level signal to single-chip microcomputer.First isolation resistance 5 is connected between the pull down resistor 4 and first input/output port 1, prevents that interfering signal from directly entering described single-chip microcomputer; Second isolation resistance 6 is connected between the pull down resistor 4 and second input/output port 2, prevents that interfering signal from directly entering described single-chip microcomputer.Simultaneously, first isolation resistance 5, second isolation resistance 6 also play current limliting, prevent that big electric current from flowing into single-chip microcomputer, causes the damage of single-chip microcomputer.Current-limiting resistance 7 is connected between switch 3 and the high potential, is used to prevent that big electric current from flowing into described single-chip microcomputer.
During normal the use, the state of switch 3 is for disconnecting, and when switch 3 disconnected, the signal that is input to single-chip microcomputer is dragged down was low level, and after switch 3 closures, the signal transition that then is input to single-chip microcomputer is a high level.Pull down resistor 4 is got between 1 kilohm to 10 kilohms usually.First isolation resistance 5, second isolation resistance 6 are got 100 ohm between thousands of ohms.
Fig. 5 is five door cover detection circuit figure of pull-down embodiment, with reference to Fig. 4 the preferred embodiments of the present invention is described in detail.
The single-chip microcomputer of this preferred embodiment comprises at least two input/output ports, and first input/output port 1 is connected with second input/output port 2.Switch 3 is connected between input/output port and the high potential.First isolation resistance 5 and first pull down resistor 8 are serially connected between first input/output port 1 and the zero potential.Second isolation resistance 6 and second pull down resistor 9 are serially connected between second input/output port 2 and the zero potential.The tie point of first isolation resistance 5 and first pull down resistor 8 is connected with switch 3, and simultaneously the tie point of second isolation resistance 6 and second pull down resistor 9 and switch are to being connected.First isolation resistance 5 is used to prevent that interfering signal from directly entering described single-chip microcomputer; Second isolation resistance 6 is used to prevent that interfering signal from directly entering described single-chip microcomputer.Simultaneously, first isolation resistance 5, second isolation resistance 6 also play current limliting, prevent that big electric current from flowing into single-chip microcomputer, causes the damage of single-chip microcomputer.Current-limiting resistance 7 is connected between switch 3 and the high potential, is used to prevent that big electric current from flowing into described single-chip microcomputer.
During normal the use, the state of switch 3 is for disconnecting, and when switch 3 disconnected, the signal that is input to single-chip microcomputer is dragged down was low level, and after switch 3 closures, the signal transition that then is input to single-chip microcomputer is a high level.Pull down resistor 4 is got between 1 kilohm to 10 kilohms usually.First isolation resistance 5, second isolation resistance 6 are got 100 ohm between thousands of ohms.
Fig. 6 is another kind of door cover detection circuit figure, and the door cover detection circuit figure with reference to one of Fig. 6 pull-up embodiment is described in detail the preferred embodiments of the present invention.
The single-chip microcomputer of another kind of door cover detection circuit of the present invention comprises at least two input/output ports, and the 3rd input/output port 12 is connected with the 4th input/output port 13.Switch 14 is connected between the tie point and zero potential of the 3rd input/output port 12 and the 4th input/output port 13.Pull-up resistor 11 is connected between the tie point and high potential of the 3rd input/output port and the 4th input/output port 13, when switch closure, provides low-potential signal to described single-chip microcomputer.
During normal the use, the state of switch 3 is for disconnecting, and when switch 3 disconnected, the signal that is input to single-chip microcomputer was a high level, and after switch 3 closures, the signal transition that then is input to single-chip microcomputer is a low level.Pull-up resistor 11 is got between 1 kilohm to 10 kilohms usually.
Fig. 7 is two door cover detection circuit figure of pull-up embodiment, with reference to Fig. 7 the preferred embodiments of the present invention is described in detail.
The single-chip microcomputer of the door cover detection circuit of this preferred embodiment comprises at least two input/output ports, and the 3rd input/output port 12 is connected with the 4th isolation resistance 16 with the 3rd isolation resistance 15 of the 4th input/output port 13 by serial connection.The 3rd isolation resistance 15 and the 4th isolation resistance 16 are used to prevent that interfering signal from directly entering described single-chip microcomputer.Switch 14 is connected between the tie point and zero potential of the 3rd input/output port 12 and the 4th input/output port 13.Pull-up resistor 11 is connected between the tie point and high potential of the 3rd input/output port 12 and the 4th input/output port 13, when switch closure, provides low-potential signal to described single-chip microcomputer.
During normal the use, the state of switch 3 is for disconnecting, and when switch 3 disconnected, the signal that is input to single-chip microcomputer was a high level, and after switch 3 closures, the signal transition that then is input to single-chip microcomputer is a low level.Pull-up resistor 11 is got between 1 kilohm to 10 kilohms usually.
Fig. 8 is three door cover detection circuit figure of pull-up embodiment, with reference to Fig. 8 the preferred embodiments of the present invention is described in detail.
The single-chip microcomputer of the door cover detection circuit of this preferred embodiment comprises at least two input/output ports, and the 3rd input/output port 12 is connected with the 4th isolation resistance 16 with the 3rd isolation resistance 15 of the 4th input/output port 13 by serial connection.The 3rd isolation resistance 15 and the 4th isolation resistance 16 are used to prevent that interfering signal from directly entering described single-chip microcomputer.Switch 14 is connected between the tie point and zero potential of the 3rd input/output port 12 and the 4th input/output port 13.First pull-up resistor 16 is connected between the 3rd isolation resistance 15 and the high potential, when switch closure, provides low-potential signal to described single-chip microcomputer.Second pull-up resistor 17 is connected between the 4th isolation resistance 16 and the high potential, when switch closure, provides low-potential signal to described single-chip microcomputer.
During normal the use, the state of switch 3 is for disconnecting, and when switch 3 disconnected, the signal that is input to single-chip microcomputer was a high level, and after switch 3 closures, the signal transition that then is input to single-chip microcomputer is a low level.Pull-up resistor 11 is got between 1 kilohm to 10 kilohms usually.
Fig. 9 is the flow chart of door cover detection method, with reference to Fig. 9 door cover detection method of the present invention is described in detail.
Door cover detection method is a control device part that is solidificated in a kind of control in the single-chip microcomputer and detects household electrical appliance such as washing machine and dish-washing machine, moves this method by single-chip microcomputer and just can realize control and safe handling to household electrical appliance.
The A point is represented the input signal detection point of first input/output port 1 in the pull-down door cover detection circuit, perhaps represents the input signal detection point of the 3rd input/output port 12 in the pull-up door cover detection circuit; B represents the input signal detection point of second input/output port 2 in the pull-down door cover detection circuit, perhaps represents the input signal detection point of the 4th input/output port 13 in the pull-up door cover detection circuit.By A point and B point to the single-chip microcomputer input signal.
After single-chip microcomputer powers on (step S00), door cover detection method is finished the following step:
(1) the A point detects door closure state disconnection (step S01);
(2) disconnection detection number of times add up (step S03);
(3) the disconnection detection number of times reaches rated value (step S04);
(4) the set door closure disconnects sign (step S11);
(5) do not reach rated value (step S04) if judge the disconnection detection number of times;
(6) the B point detects door closure state disconnection (step S05);
(7) disconnection detection number of times add up (step S07);
(8) the disconnection detection number of times reaches rated value (step S09);
(9) the set door closure disconnects sign (step S11).
Like this, just can realize processing to the input signal of at least two input/output ports of single-chip microcomputer.
Further, step (1) can also comprise:
(a) if detecting the door closure state, the A point do not disconnect (step S01);
(b) disconnection detection number of times and zero clearing (step S02);
(c) execution in step (6).
Further, step (6) can also comprise:
(d) if detecting the door closure state, the B point do not disconnect (step S05);
(e) detect A point door closure state whether close (S08);
(f), remove door closure and disconnect sign (step S10), execution in step (1) if A point door closure closes;
(h) if A point door closure does not close (S08) execution in step (1).
Realize dual reliable detection by door cover detection circuit and door cover detection method, and make single-chip microcomputer export control signal reliably, guaranteed the safe operation and the safe handling of the household electrical appliance of washing machine, dish-washing machine or dryer etc. the door closure state.
Claims (10)
1. a door cover detection circuit is characterized in that, comprising:
Single-chip microcomputer, described single-chip microcomputer comprises at least two input/output ports, first input/output port is connected with second input/output port;
Switch is connected between the tie point and high potential of described first input/output port, described second input/output port;
Pull down resistor is connected between the tie point and zero potential of described first input/output port, described second input/output port, when switch disconnects, provides low level signal to described single-chip microcomputer, when switch closure, provides high level signal to described single-chip microcomputer.
2. door cover detection circuit according to claim 1 is characterized in that, also comprises:
First isolation resistance is connected between described pull down resistor and described first input/output port, prevents that interfering signal from directly entering described single-chip microcomputer;
Second isolation resistance is connected between described pull down resistor and described second input/output port, prevents that interfering signal from directly entering described single-chip microcomputer.
3. according to claim 1 or 2 each described door cover detection circuits, it is characterized in that, also comprise:
Current-limiting resistance is connected between described switch and the high potential, is used to prevent that big electric current from flowing into described single-chip microcomputer.
4. according to each described door cover detection circuit in claim 1 or 2, it is characterized in that described pull down resistor comprises:
First pull down resistor is connected between described first input/output port and the zero potential, when switch disconnects, provides low level signal to described single-chip microcomputer, when switch closure, provides high level signal to described single-chip microcomputer;
Second pull down resistor is connected between described second input/output port and the zero potential, when switch disconnects, provides low level signal to described single-chip microcomputer, when switch closure, provides high level signal to described single-chip microcomputer.
5. a door cover detection circuit is characterized in that, comprising:
Single-chip microcomputer, described single-chip microcomputer comprises at least two input/output ports, first input/output port is connected with second input/output port;
Switch is connected between the tie point and zero potential of described first input/output port, second input/output port;
Pull-up resistor is connected between the tie point and high potential of described first input/output port, second input/output port, provides high level signal to described single-chip microcomputer when switch disconnects, and when switch closure, provides low level signal to described single-chip microcomputer.
6. door cover detection circuit according to claim 5 is characterized in that, also comprises:
The 3rd isolation resistance is connected between described pull-up resistor and described first input/output port, prevents that interfering signal from directly entering described single-chip microcomputer;
The 4th isolation resistance is connected between described pull-up resistor and described second input/output port, prevents that interfering signal from directly entering described single-chip microcomputer.
7. door cover detection circuit according to claim 6 is characterized in that, described pull-up resistor comprises:
First pull-up resistor is connected between described the 3rd isolation resistance and the high potential, when switch disconnects, provides high level signal to described single-chip microcomputer, when switch closure, provides low level signal to described single-chip microcomputer;
Second pull-up resistor is connected between described the 4th isolation resistance and the high potential, when switch disconnects, provides high level signal to described single-chip microcomputer, when switch closure, provides low level signal to described single-chip microcomputer.
8. door cover detection method comprises:
(1) the A point detects the disconnection of door closure state, described A point comprises the input signal detection point according to first input/output port in the described door cover detection circuit of claim 1, or according to the input signal detection point of first input/output port in the described door cover detection circuit of claim 5;
(2) the disconnection detection number of times adds up;
(3) the disconnection detection number of times reaches rated value;
(4) the set door closure disconnects sign;
(5) if the disconnection detection number of times does not reach rated value;
(6) the B point detects the disconnection of door closure state, described B point comprises the input signal detection point according to second input/output port in the described door cover detection circuit of claim 1, or according to the input signal detection point of second input/output port in the described door cover detection circuit of claim 5;
(7) the disconnection detection number of times adds up;
(8) the disconnection detection number of times reaches rated value;
(9) the set door closure disconnects sign.
9. door cover detection method according to claim 8, step (1) also comprises:
(a) if detecting the door closure state, the A point do not disconnect;
(b) disconnection detection number of times and zero clearing;
(c) execution in step (6).
10. according to Claim 8 or 9 each described door cover detection methods, step (6) also comprises:
(d) if detecting the door closure state, the B point do not disconnect;
Whether (e) detect A point door closure state closes;
(f) if A point door closure closes;
(g) remove door closure and disconnect sign, execution in step (1);
(h) if A point door closure does not close execution in step (1).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2005100929911A CN1919135B (en) | 2005-08-26 | 2005-08-26 | Door cover detection circuit and door cover detection method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2005100929911A CN1919135B (en) | 2005-08-26 | 2005-08-26 | Door cover detection circuit and door cover detection method |
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| CN1919135A CN1919135A (en) | 2007-02-28 |
| CN1919135B true CN1919135B (en) | 2010-11-03 |
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| US11000174B2 (en) * | 2018-03-29 | 2021-05-11 | Illinois Tool Works Inc. | Warewasher and associated spray arm assembly |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5006778A (en) * | 1989-08-11 | 1991-04-09 | Whirlpool Corporation | Motor diagnostics and electronic control for a clothers dryer |
| CN1261634A (en) * | 1999-01-19 | 2000-08-02 | 三星电子株式会社 | Safety device for door opening operation of washing machine |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5006778A (en) * | 1989-08-11 | 1991-04-09 | Whirlpool Corporation | Motor diagnostics and electronic control for a clothers dryer |
| CN1261634A (en) * | 1999-01-19 | 2000-08-02 | 三星电子株式会社 | Safety device for door opening operation of washing machine |
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| CN1919135A (en) | 2007-02-28 |
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