CN107456068B - Cooking appliance control method and control device and cooking appliance - Google Patents
Cooking appliance control method and control device and cooking appliance Download PDFInfo
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- CN107456068B CN107456068B CN201710844600.XA CN201710844600A CN107456068B CN 107456068 B CN107456068 B CN 107456068B CN 201710844600 A CN201710844600 A CN 201710844600A CN 107456068 B CN107456068 B CN 107456068B
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J27/00—Cooking-vessels
- A47J27/004—Cooking-vessels with integral electrical heating means
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/048—Monitoring; Safety
Abstract
The invention provides a control method and a control device of a cooking appliance and the cooking appliance. The control method of the cooking appliance comprises the following steps: starting timing after the cooking appliance is powered on to work; acquiring environmental parameters detected by a sensor in the cooking appliance according to a preset frequency; acquiring a parameter value of the acquired environmental parameter at a first timing point of each timing period, and determining the on-off state or the on-off duty ratio of the relay in the current timing period according to the parameter value; and controlling the state change of the relay according to the on-off state or the on-off duty ratio. The control method can ensure that the relay only acts for 1 time in the timing period, thereby ensuring that the actual service life of the product is not influenced by the problem of slight thermal disturbance, realizing the long-term reliability of the product operation, having no need of adding extra hardware, and having simple realization and low cost.
Description
Technical Field
The invention relates to the technical field of intelligent cooking, in particular to a control method of a cooking appliance, a control device of the cooking appliance and the cooking appliance.
Background
In recent years, people pay more and more attention to healthy life, the functional requirements of household appliances are more and more, the popularity of ovens and cooking products with steam mixing function is increased year by year, and particularly in recent years, the sales of the products are increased by over 50 percent every year.
With the improvement of the application coverage rate of cooking products, cheap intelligent cooking products capable of automatically adjusting self cooking parameters according to application requirements appear, products such as small ovens are also being converted from original mechanical ovens to intelligent electronic ovens with temperature sensor detection in a large area, and due to the constraint of self positioning, the cooking products generally have strict requirements on cost control.
Generally, a contact type relay with lower cost is mostly adopted in a low-cost electronic oven as a switch control device of a heating tube, although the cost is controlled, due to the fact that a control method is improper, the relay is frequently switched on and off, the reliability of products on the market is not high, and the problem of failure repair is often caused for 1-2 years.
As shown in fig. 1 and 2, at present, a mechanical contact relay 110 ' in an intelligent household electronic cooking product is generally used for controlling one or more loads, such as an upper oven heating tube 102 ', a lower oven heating tube 104 ', a steam generator 106 ', a fan 108 ', and the like, and the relay pushes (or pulls) contacts from one side to be in contact with metal contacts on the other side through the action of an electromagnetically generated suction force. The working process is that the distance between two contacts is changed under the condition of electrification, various problems influencing the service life, such as ignition, large contact resistance, heating and the like, easily occur, so that the current commonly used relay can only have the on-off service life of about 10 ten thousand to 30 ten thousand, the whole service life design of a cooking product applying the relay is limited, and the cooking product applied by a user at high frequency, such as a steam oven, a steam oven and the like, is difficult to obtain the ideal durable service life through a common control method.
The existing control method has no more than two points: firstly, when the controlled parameter (such as temperature) reaches a target point, the chip sends a switching signal to the relay circuit to directly control the switching of the relay, and the other is that the controlled parameter exceeds or is lower than the target point, the chip calculates a reasonable switching ratio, and sends the switching signal to the relay according to the requirement of the switching ratio in the following control period.
The two above approaches are theoretically without problems, but in practice problems arise in the sampling detection of the corresponding sensor (e.g. temperature sensor) in the chamber. Generally, the existing products basically adopt a method of sampling data once every 100 milliseconds, and because the sampling time is short enough, accurate control on heating of the cooking product can be better realized theoretically. In fact, due to the adoption speed is too fast, when the target temperature point is reached, the parameters (such as temperature) obtained by the measurement system can fluctuate back and forth on the target point due to the change of the external environment (such as wind disturbance, power supply voltage fluctuation of a sampling circuit and the like), so that a fast switching state can occur in the control method of the relay regardless of the above mentioned type, the relay can frequently act, the service life of the relay is seriously consumed, and the reliability of the product is poor.
For example:
1. if the relay is turned on or off through a certain temperature point (such as 230 ℃), when the power of a cooking product (such as an oven) is designed to be full power and can maintain the temperature of about 230 ℃, when the product reaches 230 ℃ and enters a temperature state maintained through the turning on or off of the heating tube, due to environmental disturbance, the temperature fed back by the cavity sensor obtained by the chip within 1 second is likely to change up and down at 230 ℃ (for example, 10 times if sampling is carried out once according to 100 ms), and under the condition of real-time output, the relay is also turned on or off frequently within each 1 second. In the worst case, if this happens in less than one second, the life of the relay will run out after several hours.
2. And if the relay passes a certain temperature point (such as 160 ℃), calculating the on-off ratio, and outputting an on-off signal to the relay in real time according to the on-off ratio in a subsequent period. This control scheme also encounters a similar situation as above, except that it occurs where the on and off of the different on-off ratios being switched intersect. For example, if a certain program needs to adopt an on-off ratio of on 10 seconds to off 20 seconds when the temperature is higher than 160 ℃, and adopt an on-off ratio of on 15 seconds to off 15 seconds when the temperature is lower than 160 ℃, then when the temperature of the cooking cavity reaches 160 ℃, especially when the program controls the on-off of the relay between 11 th second and 15 th second, due to thermal disturbance, the chip outputs frequent on-off signals to the relay, so that the relay is frequently on and off in this time period, and in the worst case, if the situation occurs in any control period, the service life of the relay will be exhausted after dozens of hours.
Therefore, how to provide a control method for intelligent cooking products to improve the durability of intelligent products using conventional contact relays is a technical problem to be solved.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art or the related art.
To this end, an aspect of the present invention is to provide a control method of a cooking appliance.
Another aspect of the present invention is to provide a control apparatus of a cooking appliance.
Yet another aspect of the present invention is to provide a cooking appliance.
In view of the above, the present invention provides a method for controlling a cooking appliance, the cooking appliance including a relay and a sensor, the method comprising: starting timing after the cooking appliance is powered on to work; acquiring environmental parameters detected by a sensor in the cooking appliance according to a preset frequency; acquiring a parameter value of the acquired environmental parameter at a first timing point of each timing period, and determining the on-off state or the on-off duty ratio of the relay in the current timing period according to the parameter value; and controlling the state change of the relay according to the on-off state or the on-off duty ratio.
According to the control method of the cooking appliance of the present invention, the hardware basis of the cooking appliance is to have at least one sensor (e.g., temperature sensor) for collecting a parameter (e.g., temperature) of an application environment, and to control an electric component (e.g., heat pipe, hot air assembly, evaporator generator, etc.) for changing the parameter (e.g., temperature) using a contact relay. When the cooking appliance is powered on to work, timing is started, the main control program samples the sensor according to a preset frequency, for example, data transmitted from a corresponding port of the sensing circuit is read once every millisecond, a parameter value measured at the sensor is calculated according to the sampled data, and at the timing point of each timing period, the main control program distributes the obtained sensor parameter value to a related control module, namely, the sensor parameter (such as temperature) is not allowed to directly enter the related control module without judgment. The module for controlling the relay only obtains the parameter value of the sensor at the first timing point in each timing period so as to determine the on-off state or the on-off duty ratio of the relay in the current timing period, and the state change of the relay is controlled according to the determined on-off state or the on-off duty ratio. By the control method, the relay can be ensured to only take 1 action (on or off) or 1 on-off (on-off period) within a timing period (such as 30 seconds), so that the actual service life of a product is ensured not to be influenced by the problem of slight thermal disturbance, and the long-term reliability of the product operation is realized; in addition, the technical scheme of the invention only changes the software control mode, does not change the hardware structure of the existing electric control circuit, and has simple realization and low cost.
In addition, the control method of the cooking appliance according to the present invention may further include the following additional features:
in the above technical solution, preferably, the control method further includes: monitoring the change condition of the parameter value at other timing points in each timing period; and calculating and storing the revised value of the on-off duty ratio according to the change value of the parameter value.
In the technical scheme, because the design of the product adopting the contact relay does not need to frequently operate the contact relay when the related parameters (such as temperature) are accurately controlled, and the other time in each timing period does not need to distribute the parameter information measured by the sensor to the module for controlling the relay. However, for precise control, the main control program still needs to obtain the parameter variation value of the product operation (such as heating) at a higher sampling frequency. Specifically, at other time points in each timing cycle, the change of the sensor parameter value is monitored, for example, whether the parameter (such as temperature) in the cooking cavity changes (rises or falls) is monitored, the revised value of the on-off duty ratio is calculated according to the change of the parameter, and the revised value is stored and used as one of the parameters for calculating the actual on-off ratio when the value of the module of the relay is controlled next time, so that the distribution of the sensing parameter and the control fine adjustment of the distribution of the operation process to the distribution are realized, the accurate control of the operation process of the product is ensured, and the cooking effect can be ensured for the cooking product.
In any one of the above technical solutions, preferably, the control method further includes: acquiring a revised value of the on-off duty ratio at a first timing point of other timing periods except a first timing period; and calculating the on-off duty ratio of the relay in the current timing period according to the parameter value and the revised value of the on-off duty ratio.
In the technical scheme, the on-off ratio of the relay is controlled and finely adjusted by acquiring the revision value obtained in the sampling process at the first timing point in other timing periods except the first timing period, so that the accurate control of the product running process is ensured, and the cooking effect can be ensured for the cooking product.
In any one of the above technical solutions, preferably, the control method further includes: and when the parameter value is abnormal, sending alarm information and/or controlling the cooking appliance to stop running.
In the technical scheme, if the corresponding controlled parameters of the product are abnormal in the period allocation time of non-relay control module access, the main control program can call corresponding safety programs according to the abnormal conditions, such as power supply cut-off, stop of all load operation or alarm error reporting, so as to ensure that the product does not bring danger to users.
In any of the above solutions, preferably, the sensor includes any one or a combination of the following: temperature sensor, pressure sensor, humidity sensor, gas concentration sensor; the environmental parameter includes any one or a combination of: temperature, pressure, humidity, gas concentration.
In this embodiment, the sensor disposed on the cooking appliance includes, but is not limited to, any one or a combination of the following: the system comprises a temperature sensor, a pressure sensor, a humidity sensor and a gas concentration sensor, and meanwhile, the parameters of the application environment collected by the main control program include but are not limited to any one or a combination of the following: temperature, pressure, humidity, gas concentration.
In any of the above technical solutions, preferably, the value range of the timing period is: 20 seconds to 300 seconds, the value range of the preset frequency is as follows: 1 time/sec to 1 time/50 microseconds.
In the technical scheme, a person skilled in the art should understand that the value range of the timing cycle is not limited to 20 seconds to 300 seconds, and since the distribution of the contact relay control module is only distributed once in the cycle, the value range of the timing cycle is limited, so that the main control program can ensure that the sensing information for controlling the traditional relay function module is sent each time, the time range of the interval is long enough, and the on-off change frequency of the relay can meet the design requirement of the service life of the household appliance. Similarly, the value range of the (sampling) preset frequency is not limited to 1/second to 1/50 microseconds, and sampling is performed according to the existing mature parameter sampling mode, namely, the rapid sampling mode of sampling once every 1 millisecond to 1 second is adopted.
In any of the above technical solutions, preferably, the timing period is 30 seconds, and the preset frequency is 1 time/10 milliseconds.
The present invention also proposes a control device of a cooking appliance, the cooking appliance including a relay and a sensor, the control device including: the timing module is used for starting timing after the cooking appliance is electrified to work; the sampling module is used for collecting environmental parameters detected by the sensor in the cooking appliance according to a preset frequency; the relay control module is used for acquiring the parameter value of the acquired environmental parameter at the first timing point of each timing period and determining the on-off state or the on-off duty ratio of the relay in the current timing period according to the parameter value; and controlling the state change of the relay according to the on-off state or the on-off duty ratio.
According to the control device of the cooking appliance of the present invention, the hardware basis of the cooking appliance is to have at least one sensor (e.g., temperature sensor) for collecting a parameter (e.g., temperature) of an application environment, and to control an electric component (e.g., heat pipe, hot air assembly, evaporator generator, etc.) for changing the parameter (e.g., temperature) using a contact relay. When the cooking appliance is powered on to work, the timing module starts timing, the sampling module samples the sensor according to a preset frequency, for example, data transmitted from a corresponding port of the sensing circuit is read once every millisecond, a parameter value measured at the sensor is calculated according to the sampled data, and at the timing point of each timing period, the main control program distributes the obtained sensor parameter value to the related control module, namely, the sensor parameter (such as temperature) directly enters the related control module without judgment. The relay control module acquires the sensor parameter value only at the first timing point in each timing period to determine the on-off state or the on-off duty ratio of the relay in the current timing period, and controls the state change of the relay according to the determined on-off state or the on-off duty ratio. By the control method, the relay can be ensured to only take 1 action (on or off) or 1 on-off (on-off period) within a timing period (such as 30 seconds), so that the actual service life of a product is ensured not to be influenced by the problem of slight thermal disturbance, and the long-term reliability of the product operation is realized; in addition, the technical scheme of the invention only changes the software control mode, does not change the hardware structure of the existing electric control circuit, and has simple realization and low cost.
In the above technical solution, preferably, the control device further includes: the monitoring module is used for monitoring the change condition of the parameter value at other timing points in each timing period; and the calculation module is used for calculating and storing the revised value of the on-off duty ratio according to the change value of the parameter value.
In the technical scheme, because the design of the product adopting the contact type relay does not need to frequently operate the contact type relay when the related parameters (such as temperature) are accurately controlled, and other time in each timing period does not need to distribute parameter information measured by the sensor to the relay control module. However, for precise control, the main control program still needs to obtain the parameter variation value of the product running (for example, heating) process at a higher sampling frequency. Specifically, at other time points in each timing cycle, the monitoring module monitors the change of the sensor parameter value, for example, whether the parameter (such as temperature) in the cooking cavity changes (rises or falls) is monitored, the revised value of the on-off duty ratio is calculated according to the change of the parameter, and the revised value is stored and used as one of the parameters for calculating the actual on-off ratio when the relay control module takes the value next time, so that the distribution of the sensing parameter and the control fine adjustment of the distribution of the running process to the distribution time are realized, the accurate control of the running process of the product is ensured, and the cooking effect can be ensured for the cooking product.
In any of the above technical solutions, preferably, the relay control module is further configured to obtain a revised value of the on-off duty ratio at a first timing point of another timing period excluding a first timing period; and calculating the on-off duty ratio of the relay in the current timing period according to the parameter value and the revised value of the on-off duty ratio.
In the technical scheme, the on-off ratio of the relay is controlled and finely adjusted by acquiring the revision value obtained in the sampling process at the first timing point in other timing periods except the first timing period, so that the accurate control of the product running process is ensured, and the cooking effect can be ensured for the cooking product.
In any one of the above technical solutions, preferably, the control device further includes: and the safety module is used for sending alarm information and/or controlling the cooking utensil to stop running when the parameter value is abnormal.
In the technical scheme, if the corresponding controlled parameters of the product are abnormal in the period allocation time of non-relay control module access, the main control program can call the corresponding safety module according to the abnormal condition to execute the safety program, such as cutting off the power supply, stopping all load operation or alarming and reporting errors, so as to ensure that the product can not bring danger to users.
In any of the above solutions, preferably, the sensor includes any one or a combination of the following: temperature sensor, pressure sensor, humidity sensor, gas concentration sensor; the environmental parameter includes any one or a combination of: temperature, pressure, humidity, gas concentration.
In this embodiment, the sensor disposed on the cooking appliance includes, but is not limited to, any one or a combination of the following: the system comprises a temperature sensor, a pressure sensor, a humidity sensor and a gas concentration sensor, and meanwhile, the parameters of the application environment collected by the main control program include but are not limited to any one or a combination of the following: temperature, pressure, humidity, gas concentration.
In any of the above technical solutions, preferably, the value range of the timing period is: 20 seconds to 300 seconds, the value range of the preset frequency is as follows: 1 time/sec to 1 time/50 microseconds.
In the technical scheme, a person skilled in the art should understand that the value range of the timing cycle is not limited to 20 seconds to 300 seconds, and since the distribution of the contact relay control module is only distributed once in the cycle, the value range of the timing cycle is limited, so that the main control program can ensure that the sensing information for controlling the traditional relay function module is sent each time, the time range of the interval is long enough, and the on-off change frequency of the relay can meet the design requirement of the service life of the household appliance. Similarly, the value range of the (sampling) preset frequency is not limited to 1/second to 1/50 microseconds, and sampling is performed according to the existing mature parameter sampling mode, namely, the rapid sampling mode of sampling once every 1 millisecond to 1 second is adopted.
In any of the above technical solutions, preferably, the timing period is 30 seconds, and the preset frequency is 1 time/10 milliseconds.
The present invention further provides a cooking appliance, including a relay and a sensor, the cooking appliance further including: the control device for a cooking appliance according to any one of the above technical solutions.
According to the cooking appliance of the present invention, the control device of the cooking appliance according to any one of the above technical solutions is adopted, so that the technical effects of the control device of the cooking appliance are all achieved, and the details are not repeated herein.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 shows a schematic view of a cooking appliance of one embodiment in the related art;
fig. 2 shows a schematic view of a cooking appliance of another embodiment in the related art;
fig. 3 shows a flow chart of a control method of a cooking appliance according to an embodiment of the present invention;
fig. 4 shows a flow chart of a control method of a cooking appliance according to another embodiment of the present invention;
fig. 5 shows a flow chart of a control method of a cooking appliance according to still another embodiment of the present invention;
fig. 6 shows a schematic block diagram of a control device of a cooking appliance according to an embodiment of the present invention;
fig. 7 shows a schematic block diagram of a control apparatus of a cooking appliance according to another embodiment of the present invention;
fig. 8 shows a schematic block diagram of a control apparatus of a cooking appliance according to still another embodiment of the present invention;
fig. 9 shows a schematic block diagram of a control apparatus of a cooking appliance according to yet another embodiment of the present invention;
fig. 10 shows a schematic block diagram of a cooking appliance according to an embodiment of the present invention;
fig. 11 is a schematic diagram showing a comparison between the time-sharing distribution control method according to an embodiment of the present invention and a general control method in the related art.
Wherein, the correspondence between the reference numbers and the component names in fig. 1 and fig. 2 is:
102 ' oven upper heating tube, 104 ' oven lower heating tube, 106 ' steam generator, 108 ' fan, 110 ' mechanical contact relay.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
As shown in fig. 3, a flowchart of a control method of a cooking appliance according to an embodiment of the present invention is illustrated. Wherein, this cooking utensil includes relay and sensor, and this control method includes:
and step 108, controlling the state change of the relay according to the on-off state or the on-off duty ratio.
The invention provides a control method of a cooking appliance, which is applied to the hardware basis of the cooking appliance and is provided with at least one sensor (such as a temperature sensor) for acquiring parameters (such as temperature) of an application environment, and a contact relay is adopted to control electric appliance parts (such as a heating pipe, a hot air assembly, an evaporator generator and the like) for changing the parameters (such as the temperature). When the cooking appliance is powered on to work, timing is started, the main control program samples the sensor according to a preset frequency, for example, data transmitted from a corresponding port of the sensing circuit is read once every millisecond, a parameter value measured at the sensor is calculated according to the sampled data, and at the timing point of each timing period, the main control program distributes the obtained sensor parameter value to a related control module, namely, the sensor parameter (such as temperature) is not allowed to directly enter the related control module without judgment. The module for controlling the relay only obtains the parameter value of the sensor at the first timing point in each timing period so as to determine the on-off state or the on-off duty ratio of the relay in the current timing period, and the state change of the relay is controlled according to the determined on-off state or the on-off duty ratio. By the control method, the relay can be ensured to be switched on and off for only 1 time (on-off period) within a timing period (such as 30 seconds), so that the actual service life of a product is ensured not to be influenced by the problem of slight thermal disturbance, and the long-term reliability of the product operation is realized; in addition, the embodiment of the invention only changes the software control mode, does not change the hardware structure of the existing electric control circuit, and has simple realization and low cost.
As shown in fig. 4, a flowchart of a control method of a cooking appliance according to another embodiment of the present invention is illustrated. Wherein, this cooking utensil includes relay and sensor, and this control method includes:
step 210, acquiring a revised value of the on-off duty ratio at a first timing point of other timing periods except a first timing period; calculating the on-off duty ratio of the relay in the current timing period according to the parameter value and the revised value of the on-off duty ratio;
and step 212, controlling the state change of the relay according to the revised on-off duty ratio.
In this embodiment, since the design of such a product using a contact relay itself does not require frequent operations of the contact relay for precise control of relevant parameters (such as temperature), it is not necessary to assign information on the parameters measured by the sensors to the module controlling the relay at other times during each timing cycle. However, for precise control, the main control program still needs to obtain the parameter variation value of the product operation (such as heating) at a higher sampling frequency. Specifically, at other time points in each timing cycle, the change of the sensor parameter value is monitored, for example, whether the parameter (such as temperature) in the cooking cavity changes (rises or falls) is monitored, the revised value of the on-off duty ratio is calculated according to the change of the parameter, and the revised value is stored and used as one of the parameters for calculating the actual on-off ratio when the value of the module of the relay is controlled next time, so that the distribution of the sensing parameter and the control fine adjustment of the distribution of the operation process to the distribution are realized, the accurate control of the operation process of the product is ensured, and the cooking effect can be ensured for the cooking product.
In the embodiment, at the first timing point in other timing periods except the first timing period, the on-off ratio of the relay is controlled and finely adjusted by acquiring the revision value obtained in the sampling process, so that the accurate control of the product running process is ensured, and the cooking effect can be ensured for the cooking product.
As shown in fig. 5, a flowchart of a control method of a cooking appliance according to still another embodiment of the present invention is illustrated. Wherein, this cooking utensil includes relay and sensor, and this control method includes:
and step 316, sending alarm information and/or controlling the cooking appliance to stop running.
In this embodiment, if the controlled parameter corresponding to the product is abnormal in the period of time allocated by the non-relay control module, the main control program may invoke a corresponding safety program according to the abnormal condition, such as cutting off the power supply, stopping the operation of all loads, or alarming for an error, so as to ensure that the product does not bring danger to the user.
In any of the above embodiments, preferably, the sensor comprises any one or combination of: temperature sensor, pressure sensor, humidity sensor, gas concentration sensor; the environmental parameter includes any one or a combination of: temperature, pressure, humidity, gas concentration.
In this embodiment, the sensor provided on the cooking appliance includes, but is not limited to, any one or a combination of the following: the system comprises a temperature sensor, a pressure sensor, a humidity sensor and a gas concentration sensor, and meanwhile, the parameters of the application environment collected by the main control program include but are not limited to any one or a combination of the following: temperature, pressure, humidity, gas concentration.
In any of the above embodiments, preferably, the value range of the timing period is: 20 seconds to 300 seconds, the value range of the preset frequency is as follows: 1 time/sec to 1 time/50 microseconds.
In the technical scheme, a person skilled in the art should understand that the value range of the timing cycle is not limited to 20 seconds to 300 seconds, and since the distribution of the contact relay control module is only distributed once in the cycle, the value range of the timing cycle is limited, so that the main control program can ensure that the sensing information for controlling the traditional relay function module is sent each time, the time range of the interval is long enough, and the on-off change frequency of the relay can meet the design requirement of the service life of the household appliance. Similarly, the value range of the (sampling) preset frequency is not limited to 1/second to 1/50 microseconds, and sampling is performed according to the existing mature parameter sampling mode, namely, the rapid sampling mode of sampling once every 1 millisecond to 1 second is adopted.
In any of the above embodiments, preferably, the timing period is 30 seconds, and the preset frequency is 1 time/10 milliseconds.
As shown in fig. 6, a schematic block diagram of a control apparatus of a cooking appliance according to an embodiment of the present invention. Wherein the cooking appliance includes a relay and a sensor, the control device 400 includes:
a timing module 402, configured to start timing when the cooking appliance is powered on;
a sampling module 404, configured to collect, according to a preset frequency, an environmental parameter inside the cooking appliance detected by the sensor;
the relay control module 406 is configured to acquire a parameter value of the acquired environmental parameter at a first timing point of each timing period, and determine an on-off state of the relay or an on-off duty ratio of the relay in the current timing period according to the parameter value; and controlling the state change of the relay according to the on-off state or the on-off duty ratio.
The control device 400 for a cooking appliance according to the present invention is applied to a cooking appliance having at least one sensor (e.g., a temperature sensor) for acquiring a parameter (e.g., temperature) of an application environment, and a contact relay for controlling an electric component (e.g., a heating tube, a hot air assembly, an evaporator generator, etc.) for changing the parameter (e.g., temperature). When the cooking appliance is powered on to work, the timing module starts timing, the sampling module samples the sensor according to a preset frequency, for example, data transmitted from a corresponding port of the sensing circuit is read once every millisecond, a parameter value measured at the sensor is calculated according to the sampled data, and at the timing point of each timing period, the main control program distributes the obtained sensor parameter value to the related control module, namely, the sensor parameter (such as temperature) directly enters the related control module without judgment. The relay control module acquires the sensor parameter value only at the first timing point in each timing period to determine the on-off state or the on-off duty ratio of the relay in the current timing period, and controls the state change of the relay according to the determined on-off state or the on-off duty ratio. By the control method, the relay can be ensured to only take 1 action (on or off) or 1 on-off (on-off period) within a timing period (such as 30 seconds), so that the actual service life of a product is ensured not to be influenced by the problem of slight thermal disturbance, and the long-term reliability of the product operation is realized; in addition, the embodiment of the invention only changes the software control mode, does not change the hardware structure of the existing electric control circuit, and has simple realization and low cost
As shown in fig. 7, a schematic block diagram of a control apparatus of a cooking appliance according to another embodiment of the present invention. Wherein the cooking appliance includes a relay and a sensor, the control device 500 includes:
the timing module 502 is used for starting timing after the cooking appliance is powered on to work;
the sampling module 504 is configured to collect environmental parameters inside the cooking appliance detected by the sensor according to a preset frequency;
the relay control module 506 is configured to acquire a parameter value of the acquired environmental parameter at a first timing point of each timing period, and determine an on-off state of the relay or an on-off duty ratio of the relay in the current timing period according to the parameter value; and controlling the state change of the relay according to the on-off state or the on-off duty ratio;
a monitoring module 508, configured to monitor a change of the parameter value at other timing points in each timing cycle;
and a calculating module 510, configured to calculate and store a revised value of the on-off duty ratio according to the change value of the parameter value.
In this embodiment, because the design of such a product using a contact relay does not require frequent operation of the contact relay to achieve precise control of the relevant parameter (e.g., temperature), it is not necessary to assign the relay control module with information about the parameter measured by the sensor at other times during each timing cycle. However, for precise control, the main control program still needs to obtain the parameter variation value of the product running (for example, heating) process at a higher sampling frequency. Specifically, at other time points in each timing cycle, the monitoring module monitors the change of the sensor parameter value, for example, whether the parameter (such as temperature) in the cooking cavity changes (rises or falls) is monitored, the revised value of the on-off duty ratio is calculated according to the change of the parameter, and the revised value is stored and used as one of the parameters for calculating the actual on-off ratio when the relay control module takes the value next time, so that the distribution of the sensing parameter and the control fine adjustment of the distribution of the running process to the distribution time are realized, the accurate control of the running process of the product is ensured, and the cooking effect can be ensured for the cooking product.
In the above embodiment, preferably, the relay control module 506 is further configured to obtain a revised value of the on-off duty ratio at the first timing point of the other timing period except the first timing period; and calculating the on-off duty ratio of the relay in the current timing period according to the parameter value and the revised value of the on-off duty ratio.
In the embodiment, at the first timing point in other timing periods except the first timing period, the on-off ratio of the relay is controlled and finely adjusted by acquiring the revision value obtained in the sampling process, so that the accurate control of the product running process is ensured, and the cooking effect can be ensured for the cooking product.
As shown in fig. 8, a schematic block diagram of a control apparatus of a cooking appliance according to still another embodiment of the present invention. Wherein the cooking appliance includes a relay and a sensor, the control device 600 includes:
the timing module 602 is configured to start timing when the cooking appliance is powered on to work;
the sampling module 604 is configured to collect an environmental parameter inside the cooking appliance detected by the sensor according to a preset frequency;
the relay control module 606 is configured to acquire a parameter value of the acquired environmental parameter at a first timing point of each timing period, and determine an on-off state of the relay or an on-off duty ratio of the relay in the current timing period according to the parameter value; and controlling the state change of the relay according to the on-off state or the on-off duty ratio;
the relay control module 606 is further configured to obtain a revised value of the on-off duty ratio at a first timing point of another timing period excluding the first timing period; calculating the on-off duty ratio of the relay in the current timing period according to the parameter value and the revised value of the on-off duty ratio;
a monitoring module 608, configured to monitor a change of the parameter value at other timing points in each timing cycle;
the calculating module 610 is used for calculating and storing the revised value of the on-off duty ratio according to the change value of the parameter value;
and the safety module 612 is used for sending alarm information and/or controlling the cooking appliance to stop running when the parameter value is abnormal.
In this embodiment, if the controlled parameter corresponding to the product is abnormal in the period of time allocated by the non-relay control module, the main control program may call the corresponding safety module according to the abnormal condition, and execute the safety program, such as cutting off the power supply, stopping the operation of all loads, or alarming for an error, so as to ensure that the product does not bring danger to the user.
In any of the above embodiments, preferably, the sensor comprises any one or combination of: temperature sensor, pressure sensor, humidity sensor, gas concentration sensor; the environmental parameter includes any one or a combination of: temperature, pressure, humidity, gas concentration.
In this embodiment, the sensor provided on the cooking appliance includes, but is not limited to, any one or a combination of the following: the system comprises a temperature sensor, a pressure sensor, a humidity sensor and a gas concentration sensor, and meanwhile, the parameters of the application environment collected by the main control program include but are not limited to any one or a combination of the following: temperature, pressure, humidity, gas concentration.
In any of the above embodiments, preferably, the value range of the timing period is: 20 seconds to 300 seconds, the value range of the preset frequency is as follows: 1 time/sec to 1 time/50 microseconds.
In the technical scheme, a person skilled in the art should understand that the value range of the timing cycle is not limited to 20 seconds to 300 seconds, and since the distribution of the contact relay control module is only distributed once in the cycle, the value range of the timing cycle is limited, so that the main control program can ensure that the sensing information for controlling the traditional relay function module is sent each time, the time range of the interval is long enough, and the on-off change frequency of the relay can meet the design requirement of the service life of the household appliance. Similarly, the value range of the (sampling) preset frequency is not limited to 1/second to 1/50 microseconds, and sampling is performed according to the existing mature parameter sampling mode, namely, the rapid sampling mode of sampling once every 1 millisecond to 1 second is adopted.
In any of the above embodiments, preferably, the timing period is 30 seconds, and the preset frequency is 1 time/10 milliseconds.
As shown in fig. 9, a schematic block diagram of a control apparatus of a cooking appliance according to still another embodiment of the present invention. Wherein the cooking appliance includes a relay and a sensor, the control device 700 includes:
a temperature acquisition module 702, configured to acquire an environmental parameter inside the cooking appliance detected by the sensor according to a preset frequency;
a monitoring, calculating and caching implementation module 704, configured to monitor a change condition of the parameter value at other timing points in each timing cycle, calculate a revised value of the on-off duty ratio according to the change value of the parameter value, and cache the revised value;
the relay on-off decision module 706 is configured to acquire a parameter value of the acquired environmental parameter at a first timing point of each timing period, and determine an on-off state of the relay or an on-off duty ratio of the relay in a current timing period according to the parameter value; acquiring a revised value of the on-off duty ratio at a first timing point of other timing periods except the first timing period; calculating the on-off duty ratio of the relay in the current timing period according to the parameter value and the revised value of the on-off duty ratio;
the timing module 708 is used for starting timing after the cooking appliance is powered on to work;
the execution module 710 is configured to control a state change of the relay according to the on-off state or the on-off duty ratio, control a state change of the relay according to the updated on-off duty ratio, and the like;
other functional modules 712 include non-functional master functional modules such as a security module, a water shortage module, etc.
In the embodiment, firstly, the control device only changes a software control mode, is simple to realize, does not generate much cost to the product, and realizes the long-term reliability of the product operation; secondly, the sampled data are transmitted to different control function modules in a time-sharing and classified manner and are adopted by the control function modules which certainly have requirements; and thirdly, the sensing information for controlling the traditional relay functional module is sent each time, and the interval time range is long enough, so that the on-off change frequency of the relay can meet the design requirement of the service life of the household appliance.
As shown in fig. 10, a schematic block diagram of a cooking appliance according to an embodiment of the present invention. Wherein, this cooking utensil 800 includes relay and sensor, still includes: the control device 802 of the cooking appliance according to any of the above embodiments.
According to the cooking apparatus 800 of the present invention, the control device 802 of the cooking apparatus in any of the above embodiments is adopted, so that the technical effects of the control device 802 of the cooking apparatus are all achieved, and the details are not repeated herein.
In a specific embodiment, the intelligent oven comprises an oven heating tube, a hot air assembly, an oven cooking cavity, a steam generator, a water supply component (a water pump, a water valve and the like), a water tank, a mechanical contact type relay, a cavity temperature sensor and a control device of a cooking appliance in any one of the above embodiments.
After the oven is powered on and operated, the main chip program starts to sample the sensor, and the sampling mode may adopt the existing common mode, such as reading data transmitted from the corresponding port of the sensing circuit every 1 millisecond, performing ADC conversion (analog-to-digital conversion), and calculating the parameter value measured at the sensor according to the obtained ADC value (as will be understood by those skilled in the art, the program may also directly provide the ADC value without performing correlation conversion).
The program is provided with a timer, the timing period is set according to actual needs, for example, 30 seconds, the countdown time or the count-down time of the cooking program can also be directly used as a timing reference, the timer counts when a related control program (such as a relay control module and the like) needs to be operated, the countdown time in the cooking program is used as the timing reference, when the cooking time is exhausted, the related control program of the relay control module is also ended, and when the cooking program is not exhausted, the main chip program can continuously sample at a preset time interval.
The main chip program transmits the obtained sensor parameters to the relevant modules according to the time points of the timers, that is, the sensor parameters (such as temperature) are directly entered into the relevant control modules without judgment, as shown in table 1:
TABLE 1 distribution of sensor parameters during a timing cycle
The sensor parameter assignment process is continued until the end of a cycle. And then periodically. It should be noted that the above-mentioned allocation, especially the allocation to the contact relay control module, is only allocated once in a period, that is, the sampling result is allocated 1 time at the 1.00 th second in table 1, and then the main control program does not allocate the sensing related information to the relay control module until the period is over. By the control method, the relay can be ensured to be only subjected to 1 action (on or off) or 1 on-off (on-off period) within 30 seconds, so that the actual service life of the product is ensured not to be influenced by the problem of slight thermal disturbance.
Since the design of such products using contact relays itself does not require frequent actions of the contact relays to precisely control relevant parameters (such as temperature), it is not necessary to assign parameter information measured by sensors to the relay control module at other times during each cycle in the above control method. However, for precise control and safety reasons, the main chip program still needs to obtain the parameter variation of the product running (for example, heating) process at a higher sampling frequency for adjusting the on-off ratio of the relay. For example, the parameters at other time points in the timing cycle are obtained except for being allocated to the relay control module, whether the parameters (such as temperature) in the product (such as an oven cooking cavity) change (rise or fall) in the process is known, a revised value of the on-off ratio of the relay is calculated according to the parameter change value, and the revised value is cached and used as one of the parameters for calculating the actual on-off ratio when the value of the relay control module is taken next time. As shown in fig. 11, the times t1, t2, and t3 are the timing points when the relay control module obtains the sensor parameters in the timing period, in the first timing period, the on-off temperature is decreasing, the subsequent relay duty ratio calculation is increased by a revision value, in the second timing period, the on-off temperature is increasing, and the subsequent relay duty ratio calculation is decreased by a revision value. Compared with the common control mode, the time-sharing distribution control mode can ensure that the relay only acts once in a timing period (such as 30 seconds), can avoid the reduction of the service life of the product caused by thermal disturbance, and leads the time for the user to enjoy the value of the product to be longer.
If the corresponding controlled parameters of the product are abnormal in the period distribution time of the non-relay control module, the main control program can call corresponding safety programs according to the abnormal conditions, such as power supply cut-off, stop of all loads or alarm error reporting, so as to ensure that the product does not bring danger to users.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (15)
1. A control method of a cooking appliance including a relay and a sensor, characterized by comprising:
starting timing after the cooking appliance is powered on to work;
collecting environmental parameters inside the cooking utensil detected by the sensor according to a preset frequency;
acquiring a parameter value of the acquired environmental parameter at a first timing point of each timing period, and determining the on-off state or the on-off duty ratio of the relay in the current timing period according to the parameter value; and
and controlling the state change of the relay according to the on-off state or the on-off duty ratio.
2. The method of controlling a cooking appliance according to claim 1, further comprising:
monitoring the change condition of the parameter value at other timing points in each timing period;
and calculating and storing the revised value of the on-off duty ratio according to the change value of the parameter value.
3. The method of controlling a cooking appliance according to claim 1, further comprising:
acquiring a revised value of the on-off duty ratio at the first timing point of other timing periods except the first timing period;
and calculating the on-off duty ratio of the relay in the current timing period according to the parameter value and the revised value of the on-off duty ratio.
4. The method of controlling a cooking appliance according to claim 2, further comprising:
and when the parameter value is abnormal, sending alarm information and/or controlling the cooking appliance to stop running.
5. The control method of a cooking appliance according to any one of claims 1 to 4,
the sensor comprises any one or combination of the following: temperature sensor, pressure sensor, humidity sensor, gas concentration sensor;
the environmental parameter includes any one or a combination of: temperature, pressure, humidity, gas concentration.
6. The control method of a cooking appliance according to any one of claims 1 to 4,
the value range of the timing period is as follows: 20 seconds to 300 seconds;
the value range of the preset frequency is as follows: 1 time/sec to 1 time/50 microseconds.
7. The control method of a cooking appliance according to claim 6,
the timing period is 30 seconds;
the preset frequency is 1 time/10 milliseconds.
8. A control device of a cooking appliance including a relay and a sensor, characterized by comprising:
the timing module is used for starting timing after the cooking appliance is electrified to work;
the sampling module is used for collecting the environmental parameters detected by the sensor in the cooking appliance according to a preset frequency;
the relay control module is used for acquiring the acquired parameter value of the environmental parameter at the first timing point of each timing period, and determining the on-off state or the on-off duty ratio of the relay in the current timing period according to the parameter value; and
and controlling the state change of the relay according to the on-off state or the on-off duty ratio.
9. The control device of the cooking appliance according to claim 8, further comprising:
the monitoring module is used for monitoring the change condition of the parameter value at other timing points in each timing cycle;
and the calculation module is used for calculating and storing the revised value of the on-off duty ratio according to the change value of the parameter value.
10. The control device of a cooking appliance according to claim 8,
the relay control module is further configured to obtain a revised value of the on-off duty ratio at the first timing point of the other timing period except the first timing period;
and calculating the on-off duty ratio of the relay in the current timing period according to the parameter value and the revised value of the on-off duty ratio.
11. The control device of the cooking appliance according to claim 9, further comprising:
and the safety module is used for sending alarm information and/or controlling the cooking appliance to stop running when the parameter value is abnormal.
12. The control device of a cooking appliance according to any one of claims 8 to 11,
the sensor comprises any one or combination of the following: temperature sensor, pressure sensor, humidity sensor, gas concentration sensor;
the environmental parameter includes any one or a combination of: temperature, pressure, humidity, gas concentration.
13. The control device of a cooking appliance according to any one of claims 8 to 11,
the value range of the timing period is as follows: 20 seconds to 300 seconds;
the value range of the preset frequency is as follows: 1 time/sec to 1 time/50 microseconds.
14. The control device of a cooking appliance according to claim 13,
the timing period is 30 seconds;
the preset frequency is 1 time/10 milliseconds.
15. A cooking appliance comprising a relay and a sensor, characterized in that the cooking appliance further comprises: the control device of the cooking appliance according to any one of claims 8 to 14.
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| CN103062978B (en) * | 2013-01-30 | 2015-07-01 | 合肥美菱股份有限公司 | Refrigerator condensation preventing heating control device and control method |
| CN103326549A (en) * | 2013-06-19 | 2013-09-25 | 南京航空航天大学 | Ladder fitting structure envelope line tracking power supply |
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