CN108200668B - Control method and device of electric heater, storage medium and processor - Google Patents
Control method and device of electric heater, storage medium and processor Download PDFInfo
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- CN108200668B CN108200668B CN201711279530.4A CN201711279530A CN108200668B CN 108200668 B CN108200668 B CN 108200668B CN 201711279530 A CN201711279530 A CN 201711279530A CN 108200668 B CN108200668 B CN 108200668B
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- switching device
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B1/00—Details of electric heating devices
- H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
- H05B1/0227—Applications
- H05B1/023—Industrial applications
- H05B1/0236—Industrial applications for vehicles
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
Abstract
The invention discloses a control method and device of an electric heater, a storage medium and a processor. The method comprises the following steps: obtaining a first difference between an actual temperature and a target temperature of the electric heater; determining a target voltage required by the electric heater during heating according to the first difference; the actual voltage of the electric heater is converted into a target voltage. By the invention, the effect of improving the control efficiency of the electric heater is achieved.
Description
Technical Field
The invention relates to the field of electric heaters, in particular to a control method and device of an electric heater, a storage medium and a processor.
Background
Currently, an electric heater with a Positive Temperature Coefficient (PTC) can provide heating for the interior of a vehicle. The PTC heater is generally connected directly to a high voltage power supply and a component of the PTC electric heater by direct conduction through a dc contactor, so that the high voltage power supply supplies power to the PTC electric heater.
However, according to the characteristic that the resistance value is larger as the temperature of the PTC heater is higher, a current spike can be generated at the initial electrifying stage, and the method can cause a large impact current at the electrifying moment, so that the direct current contactor is greatly damaged, and components can be damaged for a long time; irreparable damage to the electrolyte within the on-board battery pack may also occur; the fixed input voltage corresponds to the fixed output heat, and the output of the PTC heater is inflexible, so that the conditions that the heating is input unevenly into the vehicle and the vehicle is suddenly cooled and suddenly heated are easily caused; in addition, the PTC is powered by the mode of switching on and switching off the direct current contactor, the voltage change is large when the PTC is switched off, and the direct current contactor is easy to adhere, so that a power supply source of the PTC cannot be effectively disconnected, the PTC is further continuously heated, the temperature of the vehicle can be continuously increased, potential safety hazards exist, and the problem that the control efficiency of the electric heater is low exists.
Aiming at solving the problem of low control efficiency of the electric heater in the prior art, no effective solution is provided at present.
Disclosure of Invention
The invention mainly aims to provide a control method and device of an electric heater, a storage medium and a processor, so as to at least solve the problem of low control efficiency of the electric heater.
In order to achieve the above object, according to one aspect of the present invention, there is provided a control method of an electric heater. The method comprises the following steps: obtaining a first difference between an actual temperature and a target temperature of the electric heater; determining a target voltage required by the electric heater during heating according to the first difference; the actual voltage of the electric heater is converted into a target voltage.
Optionally, determining the target voltage required by the electric heater when heating according to the first difference comprises: carrying out proportional integral adjustment on the first difference value to obtain a first adjustment result; a target voltage corresponding to the first adjustment result is determined.
Optionally, converting the actual voltage of the electric heater to the target voltage comprises: obtaining a second difference between the actual voltage of the electric heater and the target voltage; and converting the actual voltage into a target voltage according to the second difference.
Optionally, converting the actual voltage into the target voltage according to the second difference comprises: performing proportional-integral adjustment on the second difference value to obtain a second adjustment result; and converting the actual voltage into a target voltage according to the second regulation result.
Optionally, performing proportional-integral adjustment on the second difference to obtain a second adjustment result includes: performing proportional-integral adjustment on the second difference value to obtain a duty ratio signal, wherein the second adjustment result comprises the duty ratio signal; converting the actual voltage to the target voltage according to the second adjustment result includes: comparing the duty ratio signal with a target signal to obtain a pulse signal; and controlling the actual voltage to be converted into the target voltage according to the pulse signal.
Optionally, converting the actual voltage into the target voltage according to the second adjustment result includes: determining a voltage corresponding to the second adjustment result; and converting the voltage corresponding to the second regulation result through the direct current-direct current converter to obtain the target voltage.
Optionally, before obtaining the first difference between the actual temperature of the electric heater and the target temperature, the method further comprises: and under the condition that the semiconductor switching device is conducted, the control power supply supplies power to the electric heater, wherein the semiconductor switching device is connected with the electric heater, and the buffer circuit connected with the semiconductor switching device is used for inhibiting the current rising rate of the semiconductor switching device when the semiconductor switching device is conducted.
Alternatively, the controlling the power supply to supply power to the electric heater in a case where the semiconductor switching device is turned on includes: and under the condition that the semiconductor switching device is conducted, controlling the charge of the power supply on a capacitor connected with the semiconductor switching device to be released through a resistor so as to supply power to the electric heater, wherein the buffer circuit comprises a first buffer circuit and a second buffer circuit, the first buffer circuit comprises a capacitor and a resistor, and the second buffer circuit inhibits the current rise rate of the semiconductor switching device when the semiconductor switching device is conducted through an inductor connected with the semiconductor switching device.
Optionally, after converting the actual voltage of the electric heater to the target voltage, the method further comprises: and controlling the power supply to stop supplying power to the electric heater when the semiconductor switching device is turned off, wherein a snubber circuit connected to the semiconductor switching device is used for suppressing a voltage rise rate of the semiconductor switching device when turned off.
Alternatively, the controlling the power supply to stop supplying power to the electric heater in a case where the semiconductor switching device is turned off includes: and under the condition that the semiconductor switching device is switched off, controlling the current on the electric heater to shunt to the capacitor so as to stop the power supply to the electric heater, wherein the buffer circuit comprises a capacitor which is used for inhibiting the voltage rising rate of the semiconductor switching device when the semiconductor switching device is switched off.
Optionally, after converting the actual voltage of the electric heater to the target voltage, the method further comprises: under the condition that the working current of the electric heater exceeds the rated current of the electric heater, controlling the power supply to stop supplying power to the electric heater; and/or disconnecting at least the semiconductor switching device connected to the electric heater in case the current on the bus bar of the electric heater exceeds a target current threshold.
Optionally, before converting the actual voltage of the electric heater to the target voltage, the method further comprises: and acquiring actual voltage obtained by converting the acquired voltage through a direct current-direct current converter.
Optionally, obtaining an actual voltage obtained by converting the collected voltage through a dc-dc converter includes: acquiring direct current voltage; and converting the direct current voltage through a direct current-direct current converter to obtain actual voltage.
In order to achieve the above object, according to another aspect of the present invention, there is also provided a control apparatus of an electric heater. The device includes: an acquisition unit for acquiring a first difference between an actual temperature and a target temperature of the electric heater; the determining unit is used for determining a target voltage required by the electric heater during heating according to the first difference; and the conversion unit is used for converting the actual voltage of the electric heater into the target voltage.
In order to achieve the above object, according to another aspect of the present invention, there is also provided a storage medium. The storage medium includes a stored program, wherein the apparatus in which the storage medium is located is controlled to execute the control method of the electric heater of the embodiment of the present invention when the program is run.
To achieve the above object, according to another aspect of the present invention, there is also provided a processor. The processor is used for running a program, wherein the program is run to execute the control method of the electric heater of the embodiment of the invention.
In order to achieve the above object, according to another aspect of the present invention, there is also provided an electric heater for a vehicle. The electric heater comprises the control device of the electric heater of the embodiment of the invention
In the embodiment of the invention, a first difference value between the actual temperature and the target temperature of the electric heater is obtained; determining a target voltage required by the electric heater during heating according to the first difference; the actual voltage of the electric heater is converted into a target voltage. The input voltage of the electric heater is adjusted, so that the purpose that the output temperature of the electric heater follows the target temperature is achieved, the temperature of the electric heater is flexibly adjusted, the occurrence of current spikes can be inhibited, the problem of low control efficiency of the electric heater is solved, and the effect of improving the control efficiency of the electric heater is achieved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a flowchart of a control method of an electric heater according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the electrical connections of an electrical PTC heater according to an embodiment of the invention;
fig. 3 is a schematic structural view of a PTC heater control system according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a PTC temperature regulation control system with an electrical snubber circuit in accordance with an embodiment of the present invention;
FIG. 5 is a schematic diagram of a comfort-temperature curve according to an embodiment of the present invention; and
fig. 6 is a schematic view of a control apparatus of an electric heater according to an embodiment of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1
The embodiment of the invention provides a control method of an electric heater.
Fig. 1 is a flowchart of a control method of an electric heater according to an embodiment of the present invention. As shown in fig. 1, the method comprises the steps of:
in step S102, a first difference between an actual temperature of the electric heater and a target temperature is obtained.
In the technical solution provided by step S102 of the present invention, the electric heater may be a PTC electric heater, and may be used in an air conditioning system, for example, an air conditioning system of a vehicle, where the vehicle may be a bus, an electric vehicle, and the like, without any limitation here. The actual temperature of the electric heater can be obtained by detecting the actual temperature of the electric heater through a detection unit, which can be a temperature sensor, for example, by using an infrared temperature sensor, and the actual temperature of the electric heater reflects the temperature of the current environment.
After the actual temperature of the electric heater is obtained, a first difference value between the actual temperature of the electric heater and a target temperature is obtained, the target temperature can be a reference temperature on a 'comfort-temperature' curve which is fitted in advance, and the target temperature can be obtained by adjusting parameters such as a set temperature in a vehicle and a temperature outside the vehicle. The actual temperature and the target temperature are compared and differenced to obtain a first difference value, i.e., a temperature difference value between the actual temperature and the target temperature.
And step S104, determining a target voltage required by the electric heater during heating according to the first difference.
In the technical solution provided by step S104 of the present invention, after the first difference between the actual temperature and the target temperature of the electric heater is obtained, the target voltage required by the electric heater during heating is determined according to the first difference.
Optionally, the first difference value of this embodiment is an input of a proportional-integral (PI) regulator, and the first difference value is processed by a differential proportional regulating algorithm in the temperature control loop to obtain a target voltage required by the electric heater during heating, where the target voltage is a control voltage required by the electric heater during heating and can be used as a reference voltage for adjusting an actual voltage of the electric heater.
And step S106, converting the actual voltage of the electric heater into a target voltage.
In the technical solution provided by step S106 of the present invention, after determining the target voltage required by the electric heater during heating according to the first difference, the actual voltage of the electric heater is converted into the target voltage.
The actual voltage of the electric heater of this embodiment can be detected by the detection Unit, for example, a Central Processing Unit (CPU) samples the actual voltage loaded across the PTC electric heater in real time and converts the actual voltage into an actual voltage through a DC-DC converter, which may be a Buck-Boost DC-DC converter. Because the power supply voltage of the electric heater is generally direct current high voltage, the input voltage of the electric heater which is required at will in a certain range can be realized by controlling the DC-DC converter.
Optionally, after obtaining the actual voltage of the electric heater, in the voltage control loop, a voltage difference between the actual voltage and the target voltage may be obtained, the voltage difference is processed by a PI adjustment algorithm, for example, the voltage difference is processed by the PI adjustment algorithm to obtain a duty ratio signal within a range of 0 to 1, the duty ratio signal is compared with a signal generated by a triangle generator having an amplitude of 1 and a period of several tens of KHz, and a Pulse Width Modulation (PWM) pulse signal for controlling the switching tube is output to convert the actual voltage of the electric heater into the target voltage, where the target voltage corresponds to the target temperature, so that the actual voltage input by the electric heater changes along with the target voltage, and further, the purpose of changing the output temperature value along with the target temperature is achieved.
The PI algorithm cycle of the temperature control ring is far greater than that of the voltage control ring, so that the voltages at two ends of the electric heater can be accurately controlled, the temperature fluctuation on the electric heater is very small, the mild change of heat in the vehicle can be guaranteed, the occurrence of current peaks can be inhibited, the current impact can be well solved, the precision of temperature control in the vehicle is improved, the heating efficiency and the safety of the electric heater are improved, and better experience is brought to a user.
The embodiment obtains a first difference between an actual temperature of the electric heater and a target temperature by using; determining a target voltage required by the electric heater during heating according to the first difference; the actual voltage of the electric heater is converted into a target voltage. The input voltage of the electric heater is adjusted, so that the output temperature of the electric heater can follow the target temperature, the temperature of the electric heater can be flexibly adjusted, the occurrence of current peaks can be inhibited, the problem of low control efficiency of the electric heater is solved, and the effect of improving the control efficiency of the electric heater is achieved
As an alternative embodiment, the step S104 of determining the target voltage required by the electric heater during heating according to the first difference includes: carrying out proportional integral adjustment on the first difference value to obtain a first adjustment result; a target voltage corresponding to the first adjustment result is determined.
In this embodiment, after obtaining a first difference value between the actual temperature and the target temperature of the electric heater, the first difference value is subjected to proportional-integral adjustment, and the first difference value may be used as an input of a temperature PI regulator, and the first difference value is processed by the temperature PI regulator using a PI regulation algorithm. And the signals corresponding to the first difference are subjected to proportional weighting to obtain proportional gain, and then are subjected to integral gain through an integral link, and the proportional gain and the integral gain are added together to be used as a first regulation result output by the PI link, so that a target voltage corresponding to the first regulation result is determined, and the target voltage is used as a reference voltage of a voltage control loop. The temperature PI regulator can control the difference between the actual temperature and the target temperature within a small range, thereby stabilizing the controlled amount, that is, stabilizing the actual temperature.
As an alternative embodiment, converting the actual voltage of the electric heater to the target voltage comprises: obtaining a second difference between the actual voltage of the electric heater and the target voltage; and converting the actual voltage into a target voltage according to the second difference.
In the embodiment, when the actual voltage of the electric heater is converted into the target voltage, the target voltage is used as a reference of the voltage control loop, and a second difference between the actual voltage and the target voltage of the electric heater, that is, a voltage difference between the actual voltage and the target voltage, is obtained. The second difference value is used as the input of a voltage PI regulator, the voltage PI regulator is used for processing the second difference value by using a PI regulation algorithm, and the actual voltage of the electric heater is converted into the target voltage, so that the actual voltage input by the electric heater is changed along with the target voltage, the purpose that the output temperature value is changed along with the target temperature is achieved, and the reliability of accurate temperature control is enhanced through a double-loop PI control algorithm on the aspect of software control.
As an alternative embodiment, the converting the actual voltage into the target voltage according to the second difference includes: performing proportional-integral adjustment on the second difference value to obtain a second adjustment result; and converting the actual voltage into a target voltage according to the second regulation result.
In this embodiment, after obtaining a second difference value between the actual voltage and the target voltage of the electric heater, the second difference value is subjected to proportional-integral adjustment, and the second difference value may be used as an input of a voltage PI regulator, and the second difference value is processed by the voltage PI regulator using a PI adjustment algorithm. The signals corresponding to the second difference value can be subjected to proportional weighting to obtain proportional gain, the proportional gain is obtained through an integration link, the proportional gain and the integral gain are added together to be used as a second adjusting result output by the PI link, and then the actual voltage is converted into the target voltage according to the second adjusting result. The voltage PI regulator of the embodiment can control the difference value between the actual temperature and the target temperature within a small range, so that the actual voltage of the electric heater is stabilized, and the reliability of accurate temperature control is enhanced through a double-loop PI control algorithm on the aspect of software control.
As an alternative embodiment, performing a proportional-integral adjustment on the second difference to obtain a second adjustment result includes: performing proportional-integral adjustment on the second difference value to obtain a duty ratio signal, wherein the second adjustment result comprises the duty ratio signal; converting the actual voltage to the target voltage according to the second adjustment result includes: comparing the duty ratio signal with a target signal to obtain a pulse signal; and controlling the actual voltage to be converted into the target voltage according to the pulse signal.
In the embodiment, when the second difference value is subjected to proportional-integral adjustment to obtain a second adjustment result, the voltage PI adjuster is used for performing proportional-integral adjustment on the second difference value to obtain a duty ratio signal within a range of 0-1. And when the actual voltage is converted into the target voltage according to the second regulation result, comparing the duty ratio signal with the target signal to obtain a pulse signal, wherein the target signal can be a signal generated by a triangular wave generator with the amplitude of 1 and the period of tens of KHz, the pulse signal can be a PWM pulse signal for controlling a switching tube, and the actual voltage is converted into the target voltage according to the pulse signal.
As an alternative embodiment, the converting the actual voltage into the target voltage according to the second adjustment result includes: determining a voltage corresponding to the second adjustment result; and converting the voltage corresponding to the second regulation result through the direct current-direct current converter to obtain the target voltage.
The dc-dc converter can be used for either boosting or stepping down, eventually reaching a stable voltage output. According to the embodiment, when the actual voltage is converted into the target voltage according to the second regulation result, the voltage corresponding to the second regulation result can be determined, the voltage corresponding to the second regulation result is converted by controlling the direct current-direct current converter, and then the target voltage with stable output is obtained, so that the purpose of converting the actual voltage into the target voltage is achieved, the actual voltage input by the electric heater follows the target voltage, and further the change of the output actual temperature along with the given target temperature is achieved.
As an alternative embodiment, before acquiring the first difference between the actual temperature of the electric heater and the target temperature in step S102, the method further includes: and under the condition that the semiconductor switching device is conducted, the control power supply supplies power to the electric heater, wherein the semiconductor switching device is connected with the electric heater, and the buffer circuit connected with the semiconductor switching device is used for inhibiting the current rising rate of the semiconductor switching device when the semiconductor switching device is conducted.
In this embodiment, from the aspect of hardware control, a semiconductor switching device is used to replace a conventional mechanical dc contactor, and an electric heating control method with a snubber circuit is adopted. The control power supply supplies power to the electric heater with the semiconductor switching device turned on, before acquiring a first difference between an actual temperature and a target temperature of the electric heater. The conduction of the semiconductor switching device is controlled by chip pulse, the power supply can be a high-voltage Direct Current (DC) power supply, the power supply can be obtained by distributing voltage by a power supply group through a power management system, and the power supply also is a direct current power supply for supplying power to low-voltage large current. The semiconductor switching device of this embodiment is connected to a snubber circuit, which may be a switching tube, and which suppresses the current rise rate of the device using the characteristic that the inductor current cannot abruptly change, and may be an RCD snubber circuit and a di/dt suppressor circuit having a snubber function.
Under the condition that the semiconductor switching device is conducted, the buffer circuit is used for inhibiting the current rising rate of the semiconductor switching device when the semiconductor switching device is conducted, so that the current on the electric heater can slowly rise, and the problem that large current impact is generated at the beginning of the early electricity of the electric heater is solved.
As an alternative embodiment, the controlling the power supply to supply power to the electric heater in case the semiconductor switching device is turned on includes: and under the condition that the semiconductor switching device is conducted, controlling the charge of the power supply on a capacitor connected with the semiconductor switching device to be released through a resistor so as to supply power to the electric heater, wherein the buffer circuit comprises a first buffer circuit and a second buffer circuit, the first buffer circuit comprises a capacitor and a resistor, and the second buffer circuit inhibits the current rise rate of the semiconductor switching device when the semiconductor switching device is conducted through an inductor connected with the semiconductor switching device.
The snubber circuit of this embodiment includes a first snubber circuit, and the first snubber circuit may be an RCD snubber circuit, and includes a resistor R, a diode D, and a capacitor C, and the resistor R and the diode D are connected in parallel and then connected to the capacitor C. When the semiconductor switch device is conducted, the charge of the power supply on a capacitor connected with the semiconductor switch device is controlled, the charge is released through a resistor, the current conducted by the semiconductor switch device is increased by one stage, and the first buffer circuit comprises the resistor and the capacitor. In addition, the buffer circuit also comprises a second buffer circuit which can be a di/dt suppression circuit, the second buffer circuit comprises an inductor connected with the semiconductor switch device, and due to the existence of the inductor, the current can gradually and slowly rise according to the principle that the inductor circuit can not suddenly change, thereby suppressing the current rise rate of the semiconductor switch device when the semiconductor switch device is conducted, and avoiding the problem that the electric heater generates large current impact at the beginning of early electrification.
As an alternative embodiment, after converting the actual voltage of the electric heater to the target voltage, the method further comprises: and controlling the power supply to stop supplying power to the electric heater when the semiconductor switching device is turned off, wherein a snubber circuit connected to the semiconductor switching device is used for suppressing a voltage rise rate of the semiconductor switching device when turned off.
The traditional mode of adopting the direct current contactor has large voltage change rate (du/dt) when the direct current contactor is turned off, and the direct current contactor is easy to be adhered. This embodiment controls the power supply to stop heating the electric heater when the electric conductor switching device is turned off, and suppresses the voltage rise rate of the device by utilizing the characteristic that the capacitor voltage of the snubber circuit cannot abruptly change, at which time the snubber circuit connected to the semiconductor switching device is used to suppress the voltage rise rate of the semiconductor switching device when turned off.
The embodiment controls the turn-off of the semiconductor switch device by the pulse of the chip, so that the turn-off is more reliable than a mode of mechanically turning off by adopting a direct current contactor, the adhesion condition is avoided, the situation that the power supply of the electric heater cannot be effectively turned off is avoided, the electric heater is continuously heated, the temperature continues to rise, and the problem of potential safety hazard exists.
As an alternative embodiment, the controlling the power supply to stop supplying power to the electric heater in case that the semiconductor switching device is turned off includes: and under the condition that the semiconductor switching device is switched off, controlling the current on the electric heater to shunt to the capacitor so as to stop the power supply to the electric heater, wherein the buffer circuit comprises a capacitor which is used for inhibiting the voltage rising rate of the semiconductor switching device when the semiconductor switching device is switched off.
According to the embodiment, when the power supply is controlled to stop supplying power to the electric heater, under the condition that the semiconductor switch device is disconnected, the current on the electric heater is controlled to shunt to the capacitor of the buffer circuit, so that the load on the semiconductor switch device is relieved, the voltage rise rate of the semiconductor switch device when the semiconductor switch device is disconnected is restrained, the power supply is finally stopped supplying power to the electric heater, and the adhesion condition is avoided.
As an alternative embodiment, after converting the actual voltage of the electric heater to the target voltage, the method further comprises: under the condition that the working current of the electric heater exceeds the rated current of the electric heater, controlling the power supply to stop supplying power to the electric heater; and/or disconnecting at least the semiconductor switching device connected to the electric heater in case the current on the bus bar of the electric heater exceeds a target current threshold.
The control method of the electric heater of the embodiment adopts a mode of combining hardware protection and software protection. In terms of hardware protection, when the working current of the electric heater exceeds the rated current of the electric heater, the power supply is controlled to stop supplying power to the electric heater, for example, a fuse type recoverable overcurrent fuse tube is adopted, when the current on the electric heater is too high and exceeds the rated working current of the electric heater, a fuse in the overcurrent fuse tube can be fused due to the heating action, so that the power supply of the electric heater is cut off, and the power supply is controlled to stop supplying power to the electric heater; in software protection, at least the semiconductor switching device connected to the electric heater is switched off in the event that the current on the busbar of the electric heater exceeds a target current threshold, for example, a protection current threshold, in order to prevent the adverse effect of a sharp rise in the busbar voltage in the event of a back-end no-load, the current on the bus can be collected in real time and compared with a protection current threshold value, when the current is greater than the protection current threshold value, the semiconductor switch device is turned off, and the PWM pulse signals for controlling other switch tubes are stopped, therefore, the power supply of the electric heater is cut off, the power supply is controlled to stop supplying power to the electric heater, the automatic recovery type overcurrent protective tube is adopted, the sampled current value is compared with the protection threshold value, hardware protection and software protection are triggered, the power transmission of a system is controlled, and the control safety of the electric heater is improved.
As an alternative embodiment, before converting the actual voltage of the electric heater into the target voltage, the method further comprises: and acquiring actual voltage obtained by converting the acquired voltage through a direct current-direct current converter.
In this embodiment, before the actual voltage of the electric heater is converted into the target voltage, the power supply voltage Vdc of the electric heater is collected, and the collected power supply voltage may be converted by the dc-dc converter to obtain the actual voltage input by the electric heater, thereby realizing the input voltage of the electric heater which is arbitrarily required within a certain range.
As an alternative embodiment, obtaining the actual voltage obtained by converting the collected voltage through the dc-dc converter includes: acquiring direct current voltage; and converting the direct current voltage through a direct current-direct current converter to obtain actual voltage.
In this embodiment, the power supply voltage of the electric heater is a dc voltage, which may be a dc high voltage, and may be a low voltage and a large current of a dc power supply, and the magnitude (voltage level) and direction (positive and negative) of the power supply do not change with time (relative range). The direct current voltage is converted through the direct current-direct current converter to obtain the actual voltage, for example, the power supply voltage of the electric heater is the direct current high voltage, and the input voltage of the electric heater with any requirement in a certain range can be realized by controlling the direct current-direct current converter.
This embodiment may be a high voltage powered electric heater temperature regulation control method. On one hand, the method mainly solves the problem that under the condition of high-voltage power supply, the electric heater generates large current impact at the initial power-on stage to influence the circuit safety of the system; on the other hand, from the aspect of software control, the reliability of accurate temperature control is enhanced through a double-loop PI control algorithm, a sampling current overcurrent detection technology is added, and the safety of electric heater control is improved and the efficiency of electric heater control is improved by combining hardware protection with a software protection strategy.
It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer-executable instructions and that, although a logical order is illustrated in the flowcharts, in some cases, the steps illustrated or described may be performed in an order different than presented herein.
Example 2
The technical solution of the present invention is illustrated below with reference to preferred embodiments, and specifically, a PTC electric heater is illustrated.
The embodiment adopts a PTC electric heating control method with an electrifying buffer circuit, has the advantages of hardware protection and software protection, can replace the traditional mechanical direct current contactor by using a semiconductor switching device, adopts an RCD buffer circuit and a di/dt suppression circuit, can well solve the influence of initial electrifying current impact of a high-voltage power supply type PTC electric heater, and improves the safety factor of electric heater control; the double PI ring regulator control algorithm is utilized, the voltage loaded at two ends of the PTC is dynamically controlled by collecting a data curve of human body comfort level and the ambient temperature in the vehicle and utilizing the Buck-Boost DC-DC converter, so that the temperature control precision is improved, the output heat of the PTC electric heater can be flexibly adjusted according to the requirement, the comfort level is increased, and the riding experience of a user is greatly improved; the embodiment also adopts the automatic recovery type overcurrent protective tube, compares the sampled PTC current value with the protection threshold value, triggers hardware protection and software protection, and controls the power transmission of the system, thereby increasing the safety of the control of the PTC electric heater.
The above-described method is exemplified below.
Fig. 2 is a schematic diagram of the circuit connections of an electric PTC heater according to an embodiment of the present invention. As shown in fig. 2, the DC/DC-DC converter is connected to the PTC electric heater. The power supply voltage Vdc of the PTC electric heater is generally direct current high voltage, and any required input voltage of the PTC electric heater in a certain range can be realized by controlling the DC/DC direct current-direct current converter.
Fig. 3 is a schematic structural view of a PTC heater control system according to an embodiment of the present invention. As shown in fig. 3, the outer ring of the PTC electric heater control system is a temperature control ring, and outputs a target input voltage of the PTC electric heater by PI regulation through a PI regulator for a temperature difference between a target temperature value of the PTC electric heater and an actual temperature of the PTC electric heater; the inner ring is a voltage control ring, and PI regulation is carried out on a voltage difference value between a target input voltage value and an actual voltage value of the PTC electric heater through a PI regulator to control the DC/DC converter, so that the actual voltage input by the PTC electric heater changes along with the target voltage, the purpose that an output temperature value changes along with a given temperature value is further achieved, and the control efficiency of the electric heater is improved. The target temperature of the PTC electric heater can be adjusted according to parameters such as the set temperature in the vehicle and the temperature outside the vehicle, and the actual temperature value and the actual input voltage value of the PTC can be obtained through the detection unit.
Fig. 4 is a schematic diagram of a PTC thermostat control system with an electrical snubber circuit in accordance with an embodiment of the present invention. As shown in fig. 4, the PTC electric heater is supplied with power using a direct current power supply. Wherein, the direct current DC power supply can be obtained by distributing voltage by the battery pack through the power management system. The embodiment can adopt a high-voltage direct-current DC power supply to supply power to the PTC electric heater, and also can adopt a low-voltage high-current power supply to supply power to the PTC electric heater.
In hardware control, a traditional PTC temperature regulation control system supplies power to a PTC electric heater in a mode of switching on and off a direct current contactor, so that when the direct current contactor is switched on, the current rapidly rises, and when the direct current contactor is switched off, due to the fact that du/dt is large, adhesion of the direct current contactor is easily caused, a power supply of the PTC cannot be effectively disconnected, the PTC is further continuously heated, the temperature in a vehicle continues to rise, and potential safety hazards exist. The embodiment adopts the RCD buffer circuit with the buffer function and the switching tube of the di/dt suppression circuit to replace the traditional direct current contactor, so that on one hand, the influence of large current impact generated due to the existence of high voltage at the front end in the initial electrifying stage can be improved; on the other hand, when the PTC electric heater is switched on and off, the direct current contactor can be prevented from being stuck. The RCD buffer circuit with the buffer function comprises a resistor Rs, a capacitor Cs and a diode Ds, wherein the resistor Rs and the diode Ds are connected in parallel and then connected in series with the capacitor Cs.
When the switch tube Q1 is switched on, the electric charge on the capacitor Cs discharges through the resistor Rs, so that the current on the switch tube Q1 rises for a stage, and then the load current gradually and slowly rises due to the existence of the di/dt suppression inductor L1 according to the principle that the inductor current cannot suddenly change, thereby avoiding the impact influence of large current at the moment of switching on.
When the switching tube Q1 is turned off, the heating of the PTC electric heater is stopped, and the load current is shunted to Cs, thereby reducing the load on the switching tube Q1. Because the on-off of the switching tube Q1 is controlled by the chip pulse, the on-off mode is more reliable than the on-off mode controlled by a direct current contactor in a mechanical mode, and the adhesion condition is avoided.
On the aspect of software control, the temperature of the PTC electric heater of the embodiment is accurately controlled by adopting a double PI regulation mode. Wherein, the outer loop is the temperature control ring, and the inner loop is the voltage control ring. Firstly, in a temperature control loop, a temperature sensor is used for acquiring the actual temperature on a PTC electric heater, for example, an infrared temperature sensor is used for acquiring the actual temperature on the PTC electric heater and comparing the actual temperature with a reference temperature on a fitted comfort level-temperature curve in advance to make a difference, the temperature difference value is used as the input of a temperature PI regulator, and the temperature PI regulator processes the temperature difference value through a PI algorithm to obtain a control voltage which is used as a reference quantity of a voltage control loop. In the voltage control conversion, a CPU samples the actual voltage loaded at two ends of a PTC obtained by Buck-Boost DC-DC conversion in real time, compares the actual voltage with the 'control voltage' obtained by a temperature control loop to obtain a difference value, the voltage difference value is used as the input of a voltage PI regulator, the voltage PI regulator processes the voltage difference value through a PI algorithm to obtain a duty ratio signal within the range of 0-1, and then compares the duty ratio signal with a signal generated by a signal generator through a comparator COMP, for example, the duty ratio signal can be compared with a signal generated by a sawtooth wave generator or a signal generated by a triangular wave generator with the amplitude of 1 and the period of dozens of KHz, so as to output a PWM pulse signal for controlling a switching tube Q2.
In the embodiment, because the period of the PI algorithm of the temperature control loop is far longer than that of the PI algorithm of the voltage control loop, the voltage at two ends of the PTC electric heater can be accurately controlled, and the temperature fluctuation of the PTC electric heater is very small.
Fig. 5 is a schematic illustration of a comfort-temperature curve according to an embodiment of the present invention. As shown in fig. 5, a curve of the relationship between comfort of human body and ambient temperature is described, wherein the unit of comfort is "%" and the unit of temperature is "° c". When the environmental temperature is 23-25 ℃, the human body feels most comfortable, and the comfort level can reach more than 90%; when the environmental temperature is lower, below 15 ℃, or higher than 30 ℃, the human body experience is poorer, and the comfort degree is sharply reduced. The temperature on this curve can be used as a reference temperature to compare with the actual temperature on the PTC electric heater.
In the embodiment, a mode of combining hardware protection and software protection is adopted in terms of protection measures. In terms of hardware protection, a fuse type recoverable overcurrent fuse tube is adopted, when the current of the PTC electric heater is too high, if the rated working current of the PTC electric heater is exceeded, a fuse in the fuse tube is fused due to the heating effect, and therefore the power supply of the PTC electric heater is cut off. In software protection, in order to prevent the adverse effect of rapid rise of the bus voltage under the condition of no load of the rear end, the current on the bus is collected in real time and compared with a protection current threshold, when the current is greater than a protection value, the switching tube Q1 is turned off, and meanwhile, the PWM pulse for controlling the switching tube Q2 is stopped, so that the power supply of the PTC electric heater is cut off, and the safety of a control system is improved.
It should be noted that the components other than the above components in the embodiment shown in fig. 4 are only illustrative of the embodiment of the present invention, and do not limit the embodiment of the present invention.
The embodiment aims at the circuit topology structure of voltage and temperature control at two ends of the high-voltage power supply PTC electric heater, and replaces the traditional direct current contactor with the switching tube, thereby solving the problem that the initial power-on stage of the PTC electric heater generates great current impact to influence the safety of a system circuit under the condition of high-voltage power supply from hardware; on the other hand, from the aspect of software control, the reliability of accurate control of the ambient temperature in the vehicle is enhanced through a double-loop PI control algorithm, a sampling current over-current detection technology is added, the safety of a control system is improved by utilizing a strategy of combining hardware protection and software protection, and the effect of improving the control efficiency of the electric heater is achieved.
Example 3
The embodiment of the invention also provides a control device of the electric heater. It should be noted that the control device of the electric heater of this embodiment can be used to execute the control method of the electric heater of the embodiment of the present invention.
Fig. 6 is a schematic view of a control apparatus of an electric heater according to an embodiment of the present invention. As shown in fig. 6, the apparatus includes: an acquisition unit 10, a determination unit 20 and a conversion unit 30.
An obtaining unit 10 is used for obtaining a first difference value between the actual temperature and the target temperature of the electric heater.
A determining unit 20 for determining a target voltage required by the electric heater when heating according to the first difference.
And a converting unit 30 for converting the actual voltage of the electric heater into a target voltage.
Optionally, the determining unit 20 includes: the adjusting module is used for carrying out proportional-integral adjustment on the first difference value to obtain a first adjusting result; a target voltage corresponding to the first adjustment result is determined.
Alternatively, the conversion unit 30 comprises: the first acquisition module is used for acquiring a second difference value between the actual voltage and the target voltage of the electric heater; and the conversion module is used for converting the actual voltage into the target voltage according to the second difference.
Optionally, the conversion module comprises: the adjusting submodule is used for carrying out proportional-integral adjustment on the second difference value to obtain a second adjusting result; and the converter module is used for converting the actual voltage into the target voltage according to the second regulation result.
Optionally, the adjusting submodule is configured to perform proportional-integral adjustment on the second difference value to obtain a duty ratio signal, where the second adjustment result includes the duty ratio signal; the converter module is used for comparing the duty ratio signal with a target signal to obtain a pulse signal; and controlling the actual voltage to be converted into the target voltage according to the pulse signal.
Optionally, the transformation module is configured to determine a voltage corresponding to the second adjustment result; and converting the voltage corresponding to the second regulation result through the direct current-direct current converter to obtain the target voltage.
Optionally, the apparatus further comprises: and a first control unit for controlling the power supply to supply power to the electric heater in a case where the semiconductor switching device is turned on before acquiring a first difference between an actual temperature and a target temperature of the electric heater, wherein the semiconductor switching device is connected to the electric heater, and the snubber circuit connected to the semiconductor switching device is used for suppressing a current rise rate of the semiconductor switching device at the time of turning on.
Optionally, the first control unit comprises: the first control module is used for controlling the charge of a power supply on a capacitor connected with the semiconductor switching device to be released through a resistor to supply power to the electric heater under the condition that the semiconductor switching device is conducted, wherein the buffer circuit comprises a first buffer circuit and a second buffer circuit, the first buffer circuit comprises a capacitor and a resistor, and the second buffer circuit inhibits the current rising rate of the semiconductor switching device when the semiconductor switching device is conducted through an inductor connected with the semiconductor switching device.
Optionally, the apparatus further comprises: and a second control unit for controlling the power supply to stop supplying power to the electric heater in a case where the semiconductor switching device is turned off after converting an actual voltage of the electric heater into a target voltage, wherein a snubber circuit connected to the semiconductor switching device is used to suppress a voltage rise rate of the semiconductor switching device at the time of turning off.
Optionally, the second control unit comprises: and the second control module is used for controlling the current on the electric heater to be shunted to the capacitor under the condition that the semiconductor switching device is switched off so as to stop the power supply to the electric heater, wherein the buffer circuit comprises the capacitor which is used for inhibiting the voltage rising rate of the semiconductor switching device when the semiconductor switching device is switched off.
Optionally, the apparatus further comprises: a third control unit for controlling the power supply to stop supplying power to the electric heater in case that the operating current of the electric heater exceeds the rated current of the electric heater after converting the actual voltage of the electric heater into the target voltage; and/or disconnecting at least the semiconductor switching device connected to the electric heater in case the current on the bus bar of the electric heater exceeds a target current threshold.
Optionally, the apparatus further comprises: the first acquisition unit is used for acquiring actual voltage obtained by converting the acquired voltage through the direct current-direct current converter before converting the actual voltage of the electric heater into target voltage.
Optionally, the first obtaining unit includes: the second acquisition module is used for acquiring direct-current voltage; and the change module is used for converting the direct-current voltage through the direct-current-direct-current converter to obtain the actual voltage.
The embodiment acquires a first difference value between an actual temperature and a target temperature of the electric heater through the acquisition unit 10, determines a target electricity required by the electric heater during heating according to the first difference value through the determination unit 20, and converts an actual voltage of the electric heater into a target voltage through the conversion unit 30. The input voltage of the electric heater is adjusted, so that the purpose that the output temperature of the electric heater follows the target temperature is achieved, the temperature of the electric heater is flexibly adjusted, the occurrence of current spikes can be inhibited, the problem of low control efficiency of the electric heater is solved, and the effect of improving the control efficiency of the electric heater is achieved.
Example 4
The embodiment of the invention also provides a storage medium. The storage medium includes a stored program, wherein the apparatus in which the storage medium is located is controlled to execute the control method of the electric heater of the embodiment of the present invention when the program is run.
Example 5
The embodiment of the invention also provides a processor. The processor is used for running a program, wherein the program is run to execute the control method of the electric heater of the embodiment of the invention.
Example 6
The embodiment of the invention also provides an electric heater of the vehicle. The electric heater of the vehicle includes a control device of the electric heater of the embodiment of the invention. The electric heater of the vehicle may be an electric heater in an air conditioning system of the vehicle. Optionally, the vehicle is a bus or an electric car.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and they may alternatively be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, or fabricated separately as individual integrated circuit modules, or fabricated as a single integrated circuit module from multiple modules or steps. Thus, the present invention is not limited to any specific combination of hardware and software.
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 (17)
1. A method of controlling an electric heater, comprising:
acquiring a first difference value between the actual temperature of the electric heater and a target temperature, wherein the target temperature is a temperature on a curve of a numerical relationship between human body comfort level and environment temperature which is fitted in advance;
determining a target voltage required by the electric heater during heating according to the first difference value through a temperature control loop;
converting the actual voltage of the electric heater into the target voltage through a voltage control loop;
wherein a period in which the temperature control loop performs proportional-integral adjustment on the first difference is longer than a period in which the voltage control loop performs proportional-integral adjustment on a second difference between the actual voltage of the electric heater and the target voltage.
2. The method of claim 1, wherein determining the target voltage required by the electric heater when heating from the first difference comprises:
carrying out proportional integral adjustment on the first difference value to obtain a first adjustment result;
determining the target voltage corresponding to the first adjustment result.
3. The method of claim 1, wherein converting the actual voltage of the electric heater to the target voltage comprises:
acquiring a second difference value between the actual voltage of the electric heater and the target voltage;
and converting the actual voltage into the target voltage according to the second difference.
4. The method of claim 3, wherein converting the actual voltage to the target voltage according to the second difference comprises:
performing proportional-integral adjustment on the second difference value to obtain a second adjustment result;
and converting the actual voltage into the target voltage according to the second adjusting result.
5. The method of claim 4,
performing proportional-integral adjustment on the second difference value to obtain a second adjustment result, wherein the obtaining of the second adjustment result comprises: performing proportional-integral adjustment on the second difference value to obtain a duty ratio signal, wherein the second adjustment result comprises the duty ratio signal;
converting the actual voltage to the target voltage according to the second adjustment result includes: comparing the duty ratio signal with a target signal to obtain a pulse signal; and controlling the actual voltage to be converted into the target voltage according to the pulse signal.
6. The method of claim 4, wherein converting the actual voltage to the target voltage according to the second adjustment result comprises:
determining a voltage corresponding to the second adjustment result;
and converting the voltage corresponding to the second regulation result through a direct current-direct current converter to obtain the target voltage.
7. The method of claim 1, wherein prior to obtaining the first difference between the actual temperature and the target temperature of the electric heater, the method further comprises:
and under the condition that the semiconductor switching device is conducted, controlling a power supply to supply power to the electric heater, wherein the semiconductor switching device is connected with the electric heater, and a buffer circuit connected with the semiconductor switching device is used for inhibiting the current rise rate of the semiconductor switching device when the semiconductor switching device is conducted.
8. The method of claim 7, wherein controlling the power supply to supply power to the electric heater with the semiconductor switching device turned on comprises:
and under the condition that the semiconductor switching device is conducted, controlling the charge of the power supply on a capacitor connected with the semiconductor switching device to be released through a resistor so as to supply power to the electric heater, wherein the buffer circuit comprises a first buffer circuit and a second buffer circuit, the first buffer circuit comprises the capacitor and the resistor, and the second buffer circuit inhibits the current rising rate of the semiconductor switching device when the semiconductor switching device is conducted through an inductor connected with the semiconductor switching device.
9. The method of claim 1, wherein after converting the actual voltage of the electric heater to the target voltage, the method further comprises:
and under the condition that the semiconductor switching device is switched off, controlling a power supply to stop supplying power to the electric heater, wherein a buffer circuit connected with the semiconductor switching device is used for inhibiting the voltage rising rate of the semiconductor switching device when the semiconductor switching device is switched off.
10. The method of claim 9, wherein controlling the power supply to stop supplying power to the electric heater with the semiconductor switching device turned off comprises:
and under the condition that the semiconductor switching device is switched off, controlling the current on the electric heater to be shunted to a capacitor so as to enable the power supply to stop supplying power to the electric heater, wherein the buffer circuit comprises the capacitor which is used for inhibiting the voltage rising rate of the semiconductor switching device when the semiconductor switching device is switched off.
11. The method of claim 1, wherein after converting the actual voltage of the electric heater to the target voltage, the method further comprises:
under the condition that the working current of the electric heater exceeds the rated current of the electric heater, controlling a power supply to stop supplying power to the electric heater; and/or
In the case that the current on the bus bar of the electric heater exceeds a target current threshold, at least the semiconductor switching device connected to the electric heater is turned off.
12. The method of any one of claims 1 to 11, wherein prior to converting the actual voltage of the electric heater to the target voltage, the method further comprises:
and acquiring the actual voltage obtained by converting the acquired voltage through a direct current-direct current converter.
13. The method of claim 12, wherein obtaining the actual voltage obtained by converting the collected voltage through the dc-dc converter comprises:
acquiring direct current voltage;
and converting the direct current voltage through the direct current-direct current converter to obtain the actual voltage.
14. A control device of an electric heater is characterized in that,
the electric heater comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring a first difference value between the actual temperature of the electric heater and a target temperature, and the target temperature is a temperature on a curve of a numerical relationship between human body comfort level and environment temperature which is fitted in advance;
the determining unit is used for determining a target voltage required by the electric heater during heating according to the first difference value through a temperature control loop;
the conversion unit is used for converting the actual voltage of the electric heater into the target voltage through a voltage control loop;
wherein a period in which the temperature control loop performs proportional-integral adjustment on the first difference is longer than a period in which the voltage control loop performs proportional-integral adjustment on a second difference between the actual voltage of the electric heater and the target voltage.
15. A storage medium characterized by comprising a stored program, wherein an apparatus in which the storage medium is located is controlled to execute the control method of the electric heater according to any one of claims 1 to 13 when the program is run.
16. A processor, characterized in that the processor is configured to run a program, wherein the program is configured to execute the method of controlling an electric heater according to any one of claims 1 to 13 when running.
17. An electric heater for a vehicle, characterized by comprising the control device of the electric heater according to claim 14.
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| CN110859014B (en) * | 2018-08-22 | 2021-12-17 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating equipment, electromagnetic heating device and control method thereof |
| KR102598417B1 (en) * | 2018-10-05 | 2023-11-06 | 현대자동차주식회사 | Controlling method for heating of hybrid vehicle |
| CN111338403A (en) * | 2020-03-17 | 2020-06-26 | 无锡雷利电子控制技术有限公司 | Control method and control system of PTC heating device |
| CN113849010A (en) * | 2021-09-01 | 2021-12-28 | 九阳股份有限公司 | Temperature control method and heating equipment |
| WO2023188096A1 (en) * | 2022-03-30 | 2023-10-05 | 三菱電機株式会社 | Air conditioning control device and air conditioning control method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104515255A (en) * | 2013-09-30 | 2015-04-15 | 郑州科林车用空调有限公司 | Method and system of passenger car air conditioner for regulating temperature through intelligent combined control on temperature and humidity |
| CN104691271A (en) * | 2013-12-10 | 2015-06-10 | 现代自动车株式会社 | Heater control system for environmental friendly vehicle and method thereof |
| CN105700584A (en) * | 2014-11-26 | 2016-06-22 | 中国科学院沈阳自动化研究所 | Temperature control circuit and temperature control method for hot knife mechanism |
| CN106166934A (en) * | 2016-08-05 | 2016-11-30 | 惠州市德赛西威汽车电子股份有限公司 | The control system for PTC heater of a kind of automotive air-conditioning controller and method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20120131744A (en) * | 2011-05-26 | 2012-12-05 | 한라공조주식회사 | Air conditioning system for automotive vehicle |
-
2017
- 2017-12-06 CN CN201711279530.4A patent/CN108200668B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104515255A (en) * | 2013-09-30 | 2015-04-15 | 郑州科林车用空调有限公司 | Method and system of passenger car air conditioner for regulating temperature through intelligent combined control on temperature and humidity |
| CN104691271A (en) * | 2013-12-10 | 2015-06-10 | 现代自动车株式会社 | Heater control system for environmental friendly vehicle and method thereof |
| CN105700584A (en) * | 2014-11-26 | 2016-06-22 | 中国科学院沈阳自动化研究所 | Temperature control circuit and temperature control method for hot knife mechanism |
| CN106166934A (en) * | 2016-08-05 | 2016-11-30 | 惠州市德赛西威汽车电子股份有限公司 | The control system for PTC heater of a kind of automotive air-conditioning controller and method |
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