WO2018018834A1 - Véhicule électrique, ainsi que procédé et système de commande d'un dispositif de chauffage électrique à coefficient de température positif (ptc) d'un véhicule électrique - Google Patents

Véhicule électrique, ainsi que procédé et système de commande d'un dispositif de chauffage électrique à coefficient de température positif (ptc) d'un véhicule électrique Download PDF

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WO2018018834A1
WO2018018834A1 PCT/CN2016/111150 CN2016111150W WO2018018834A1 WO 2018018834 A1 WO2018018834 A1 WO 2018018834A1 CN 2016111150 W CN2016111150 W CN 2016111150W WO 2018018834 A1 WO2018018834 A1 WO 2018018834A1
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Prior art keywords
electric heater
ptc electric
current
power
ptc
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PCT/CN2016/111150
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English (en)
Chinese (zh)
Inventor
李奇
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北京新能源汽车股份有限公司
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Publication of WO2018018834A1 publication Critical patent/WO2018018834A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/22—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant
    • B60H1/2215—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant the heat being derived from electric heaters
    • B60H1/2218—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant the heat being derived from electric heaters controlling the operation of electric heaters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/22—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H3/00—Air heaters
    • F24H3/02—Air heaters with forced circulation
    • F24H3/04—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element
    • 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
    • H05B3/00—Ohmic-resistance heating
    • H05B3/02—Details
    • 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
    • H05B3/00—Ohmic-resistance heating
    • H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
    • H05B3/12—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
    • H05B3/14—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/22—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant
    • B60H2001/2246—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant obtaining information from a variable, e.g. by means of a sensor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/22—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant
    • B60H2001/2259—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant output of a control signal

Definitions

  • the present invention relates to the field of electric vehicle technology, and in particular to a control method for a PTC electric heater for an electric vehicle, a control system for a PTC electric heater for an electric vehicle, and an electric vehicle.
  • the other is PWM (Pulse Width Modulation) control, as shown in Figure 2, by controlling the switching frequency of the power switch tube (such as IGBT) to achieve current control to adjust the heating power of the PTC electric heater
  • the switching control frequency of the power switch tube is generally about 100 to 2 k Hz, and the switching frequency is high, so the external electromagnetic interference is serious, and the switching loss is large, and the power switch tube needs a sufficient heat dissipation design.
  • the PTC electric heater is composed of a semiconductor ceramic material, its resistance characteristics change with temperature. When the temperature reaches the Curie temperature point, the resistance will increase sharply, so the temperature will not rise all the time and play a protective role. However, this characteristic causes the heat output of the PTC electric heater to be unstable. Under the conditions of different heat dissipation conditions and different ambient temperatures, the heat output from the same PTC material is not the same, and there is a problem that the target power (heat generation) cannot be adjusted to a comfortable level.
  • a first object of the present invention is to provide a control method for a PTC electric heater for an electric vehicle, which uses a current integration algorithm to control the power switch tube so that the PTC electric heater is in each switching cycle.
  • the heat generated inside is consistent with the heat generated by the target power, achieving uniform heat output, greatly improving comfort, and also reducing electromagnetic interference and switching loss.
  • the heating power control of the PTC electric heater is more accurate.
  • a second object of the present invention is to propose a control system for a PTC electric heater for an electric vehicle.
  • a third object of the present invention is to provide an electric vehicle.
  • a first aspect of the present invention provides a control method for a PTC electric heater for an electric vehicle, wherein a heating power of the PTC electric heater is controlled by a power switch tube, and the method includes The following steps: detecting an operating current of the PTC electric heater; sampling the operating current to obtain a current sampling value, and integrating the current sampling value of each sampling period to obtain the PTC electric heater Computing power; Determining, in each switching cycle of the power switch tube, whether the calculated power reaches a target power of the PTC electric heater; if the calculated power reaches a target power of the PTC electric heater, by controlling the The power switch tube stops the heating by controlling the PTC electric heater so that the heat quantity of the PTC electric heater in each switching cycle is consistent with the heat quantity corresponding to the target power.
  • a control method for a PTC electric heater for an electric vehicle first detects an operating current of the PTC electric heater, samples the operating current to obtain a current sampling value, and then samples the current for each sampling period. The value is integrated to obtain the calculated power of the PTC electric heater. Finally, when it is judged that the calculated power reaches the target power of the PTC electric heater in each switching cycle of the power switch tube, the PTC electric heater is controlled to stop heating by controlling the power switch tube. Therefore, the current integration algorithm is used to control the power switch tube, so that the heat generated by the PTC electric heater in each switching cycle is consistent with the heat amount corresponding to the target power, thereby achieving uniform heat output, thereby greatly improving comfort. It can also reduce electromagnetic interference and switching loss, and control the heating power of PTC electric heater more accurately.
  • integrating the current sampling value of each sampling period to obtain the calculated power of the PTC electric heater includes: integrating the current sampling value for each sampling period Obtaining a plurality of integrated values, and accumulating the plurality of integrated values to obtain a first calculated value; calculating the hair of the PTC electric heater according to the first calculated value and a rated operating voltage of the PTC electric heater The heat is calculated, and the calculated power of the PTC electric heater is calculated according to the calorific value of the PTC electric heater and the accumulated time for performing integral calculation.
  • the switching period of the power switch tube is greater than the sampling period.
  • the switching period of the power switch tube is 10-30 seconds.
  • the method for controlling a PTC electric heater for an electric vehicle further includes: acquiring a current in-vehicle thermal degree level parameter, a current wind speed level parameter, and a current outdoor ambient temperature;
  • the current in-vehicle hot and cold degree level parameter and the current wind speed level parameter acquire the outlet air temperature, and compensate the outlet air temperature according to the current outdoor ambient temperature; and control the power switch tube according to the compensated outlet air temperature To adjust the amount of heat generated by the PTC electric heater.
  • a control system for a PTC electric heater for an electric vehicle includes: a power switch tube for controlling heating power of the PTC electric heater; and current detection a unit for detecting an operating current of the PTC electric heater; a current sampling unit for sampling the operating current to obtain a current sampling value; and a calculating unit for the current sampling value for each sampling period Performing an integral calculation to obtain a calculated power of the PTC electric heater; a determining unit, configured to determine, in each switching cycle of the power switching tube, whether the calculated power reaches a target power of the PTC electric heater; a control unit, configured to control the PTC electric heater to stop heating by controlling the power switch tube when the calculated power reaches a target power of the PTC electric heater, so that the PTC electric heater is in each The amount of heat generated during one switching cycle is consistent with the amount of heat generated by the target power.
  • a control system for a PTC electric heater for an electric vehicle detects an operating current of a PTC electric heater by a current detecting unit, and samples an operating current by a current sampling unit to obtain a current sampling value, and then calculates The unit performs integral calculation on the current sampling value of each sampling period to obtain the calculated power of the PTC electric heater, and the first control unit controls the power when the power reaches the target power of the PTC electric heater in each switching cycle of the power switching tube.
  • the power switch tube controls the PTC electric heater to stop heating, so the present invention uses a current integration algorithm to control the power switch tube, so that the heat generated by the PTC electric heater in each switch cycle is consistent with the heat amount corresponding to the target power.
  • the overall output heat is equalized, the comfort is greatly improved, and the electromagnetic interference and the switching loss can be reduced, and the heating power control of the PTC electric heater is more accurate.
  • the calculating unit is further configured to perform integral calculation on the current sample value of each sampling period to obtain a plurality of integrated values, and accumulate the plurality of integrated values to obtain a first Calculating a value, and calculating a calorific value of the PTC electric heater according to the first calculated value and a rated operating voltage of the PTC electric heater, and accumulating according to a calorific value of the PTC electric heater and an integral calculation The calculated power of the PTC electric heater is calculated.
  • the switching period of the power switch tube is greater than the sampling period.
  • the switching period of the power switch tube is 10-30 seconds.
  • the control system for a PTC electric heater for an electric vehicle further includes: an acquisition unit configured to acquire a current in-vehicle thermal degree level parameter, a current wind speed level parameter, and a current outdoor environment. a second control unit, configured to acquire an outlet air temperature according to the current in-vehicle thermal degree level parameter and a current wind speed level parameter, and compensate the outlet air temperature according to the current outdoor ambient temperature, so as to The first control unit controls the power switch tube according to the compensated air outlet temperature to adjust the heat generation amount of the PTC electric heater.
  • an embodiment of the present invention also proposes an electric vehicle including the above-described control system for a PTC electric heater for an electric vehicle.
  • the heating power of the PTC electric heater can be more accurately controlled by the above-mentioned control system of the PTC electric heater, so that the calorific value of the PTC electric heater in each switching cycle
  • the heat output corresponding to the target power is kept consistent, achieving an overall output heat equalization, greatly improving comfort, and also reducing electromagnetic interference and switching loss.
  • FIG. 1 is a schematic diagram of a power grading of a PTC electric heater using a plurality of power switch combinations in the related art
  • FIG. 2 is a schematic diagram of implementing PTC electric heater power grading by using PWM control in the related art
  • FIG. 3 is a flow chart of a method of controlling a PTC electric heater for an electric vehicle according to an embodiment of the present invention
  • FIG. 4 is a graph showing the operating current of a PTC electric heater observed by a current oscilloscope according to an embodiment of the present invention.
  • FIG. 5 is a schematic diagram of calculating power calculated by integrating an operating current curve of a PTC electric heater according to an embodiment of the present invention
  • FIG. 6 is a block diagram showing a control system of a PTC electric heater for an electric vehicle according to an embodiment of the present invention
  • FIG. 7 is a block schematic diagram of a control system for a PTC electric heater for an electric vehicle, in accordance with one embodiment of the present invention.
  • FIG. 3 is a flow chart of a method of controlling a PTC electric heater for an electric vehicle according to an embodiment of the present invention. Wherein, the heating power of the PTC electric heater is controlled by the power switch tube, as shown in FIG. 3, the control method of the PTC electric heater for the electric vehicle includes the following steps:
  • detecting the working current of the PTC electric heater for example, the working current of the electric heater can be detected by a current transformer, a current detecting resistor or the like.
  • the working current is sampled to obtain a current sampling value, and the current sampling value of each sampling period is integrated to obtain a calculated power of the PTC electric heater.
  • the working current can be AD sampled to obtain the current sampling value.
  • integrating the current sampling value of each sampling period to obtain the calculated power of the PTC electric heater includes: integrating the current sampling value for each sampling period Obtaining a plurality of integrated values, and accumulating the plurality of integrated values to obtain a first calculated value; calculating the hair of the PTC electric heater according to the first calculated value and a rated operating voltage of the PTC electric heater The heat is calculated, and the calculated power of the PTC electric heater is calculated according to the calorific value of the PTC electric heater and the accumulated time for performing integral calculation.
  • the operating current collection of the PTC electric heater can be observed by a current oscilloscope, for example, for a 1.2 kW PTC electric heater,
  • a current oscilloscope for example, for a 1.2 kW PTC electric heater
  • the PTC is controlled by controlling the power switch tube
  • the electric heater stops heating so that the calorific value of the PTC electric heater in each switching cycle is consistent with the calorific value corresponding to the target power.
  • the current integration algorithm is used, and the operating current of the PTC electric heater can be sampled periodically (per sampling period), and then the current sampling value of each sampling period is integrated, and The integral accumulation is continuously performed, and then the calculated power of the PTC electric heater is calculated by calculating the calorific value of the PTC electric heater and the cumulative time calculated based on the calorific value of the PTC electric heater and the integral calculation.
  • the control power switch tube for example, the IGBT is turned off, so that the heat generation amount of the PTC electric heater is always kept constant for one switching period, for example, 30 seconds. That is, the control method of the PTC electric heater for an electric vehicle according to the embodiment of the present invention uses a current integration algorithm to control the power switch tube, and can ensure that the heat generation amount of the PTC electric heater in each switching cycle is set. The value is fixed, and does not change with the temperature at the start-up, the ambient temperature, and the amount of heat dissipation, so that the overall output heat is equal and the comfort is good.
  • the switching period of the power switching transistor is greater than the sampling period.
  • the switching period of the power switch can be 10-30 seconds, and the sampling period is usually a few milliseconds.
  • the control of the power switch tube is a long-period (very low-frequency) switch control mode, and the switching period of the power switch tube is between 10 and 30 seconds ( Frequency 0.03 to 0.1 Hz).
  • a switching frequency can make the heating power control of the PTC electric heater more accurate, and the hot air blows does not affect the subjective feeling to the person, improves the comfort, and greatly reduces the external electromagnetic interference and the power switch tube. Switching loss.
  • the power (heat generation) of the PTC electric heater output is adjusted by the duty cycle control of closing and opening in one switching cycle.
  • the power switch tube can be closed for 5 seconds and disconnected for 25 seconds; when a larger output power is required, the power switch tube can remain closed at all times.
  • the long period has little effect on the temperature, but it can reduce the electromagnetic interference to a large extent and reduce the switching loss, making the IGBT heat dissipation design easier.
  • a control method for a PTC electric heater for an electric vehicle first detects an operating current of the PTC electric heater, samples the operating current to obtain a current sampling value, and then samples the current for each sampling period. The value is integrated to obtain the calculated power of the PTC electric heater. Finally, when it is judged that the calculated power reaches the target power of the PTC electric heater in each switching cycle of the power switch tube, the PTC electric heater is controlled to stop heating by controlling the power switch tube. Therefore, the current integration algorithm is used to control the power switch tube, so that the heat generated by the PTC electric heater in each switching cycle is consistent with the heat amount corresponding to the target power, thereby achieving uniform heat output, thereby greatly improving comfort. It can also reduce electromagnetic interference and switching loss, and control the heating power of PTC electric heater more accurately.
  • the method for controlling a PTC electric heater for an electric vehicle further includes: acquiring a current in-vehicle thermal degree level parameter, a current wind speed level parameter, and a current outdoor ambient temperature; The internal cooling heat level parameter and the current wind speed level parameter obtain the wind temperature, and compensate the air outlet temperature according to the current outdoor ambient temperature; and control the power switch tube according to the compensated air outlet temperature to adjust The amount of heat generated by the PTC electric heater.
  • the PTC electric heater can be equally divided into a plurality of heating levels, so that the heating level of the required PTC electric heater can be calculated or calibrated by the current air volume, the user's cold heat demand, and the outdoor ambient temperature.
  • the PTC electric heater maintains the energy waste caused by the high power constant high temperature heating state.
  • the mixing damper is kept in a state of full heat, and the heating capacity of the PTC electric heater is adjusted to meet the heating and heating demand of the user.
  • the adjustment of the calorific value of the PTC electric heater requires at least three variables, namely the thermal degree level parameter, the wind speed level parameter and the outdoor ambient temperature.
  • this variable represents the user's need for the outlet air temperature.
  • the system of PTC electric heater The thermal power should be larger to ensure that the outlet air temperature is constant; for outdoor ambient temperature, this variable indicates the temperature at which the inlet end of the PTC electric heater draws in natural wind, and in the colder winter, the heating power of the PTC electric heater It should be supplemented appropriately to ensure that the outlet temperature can meet the heating requirements.
  • the look-up table method can be used to obtain the wind temperature, and then the temperature is compensated by looking up the table, and then the obtained air temperature is compensated according to the compensation temperature, and finally reaches different working conditions. Under, to meet the user's comfort requirements for heating.
  • the hot and cold degree level parameter - wind speed level parameter - the outlet air temperature table is shown in Table 1 below
  • the outdoor ambient temperature - compensation temperature table is shown in Table 2 below.
  • the unit of the outlet air temperature is Celsius.
  • the outdoor ambient temperature and the compensation temperature are in degrees Celsius.
  • the power of the PTC electric heater can be subdivided into 20 heat generation levels.
  • the heating capacity of the PTC electric heater is adjusted to meet the heating heating demand of the user, thereby reducing energy waste and fully satisfying the user. Demand.
  • control system for the PTC electric heater for an electric vehicle includes a power switch tube 10 such as an IGBT, a current detecting unit 20, a current sampling unit 30, a calculation unit 40, a judging unit 50, and a first control unit 60. .
  • the power switch tube 10, for example, an IGBT is used to control the heating power of the PTC electric heater.
  • the current detecting unit 20 can detect the operating current of the PTC electric heater by using a current transformer or a current detecting resistor, for example, the current sampling unit 30.
  • the working current is sampled to obtain a current sampling value
  • the calculating unit 40 is configured to perform an integral calculation on the current sampling value of each sampling period to obtain a calculated power of the PTC electric heater
  • the determining unit 50 is configured to Determining, in each switching cycle of the power switch tube, whether the calculated power reaches a target power of the PTC electric heater
  • the first control unit 60 is configured to achieve the target of the PTC electric heater at the calculated power
  • the power is controlled by the power switch tube to control the PTC electric heater to stop heating, so that the heat generated by the PTC electric heater in each switching cycle is consistent with the calorific value corresponding to the target power.
  • the calculating unit 40 is further configured to perform integral calculation on the current sample value of each sampling period to obtain a plurality of integrated values, and accumulate the plurality of integrated values to obtain a first calculation a value, and calculating a calorific value of the PTC electric heater according to the first calculated value and a rated operating voltage of the PTC electric heater, and calculating a cumulative time according to a calorific value of the PTC electric heater and an integral calculation Calculating the calculated power of the PTC electric heater.
  • the operating current collection of the PTC electric heater can be observed by a current oscilloscope, for example, for a 1.2 kW PTC electric heater.
  • a current oscilloscope for example, for a 1.2 kW PTC electric heater.
  • the target power set by the PTC electric heater is 400W, it does not need to keep heating work for the 1.2KW PTC electric heater, for example, only need to be energized for a certain time in the 30-second switching cycle of the power switch tube. Just fine.
  • the current sampling unit 30 can be periodically (per sampling period) Sampling the operating current of the PTC electric heater, and then calculating unit 40 performs integral calculation on the current sampling value of each sampling period, and continuously performs integral accumulation, and then calculates the calorific value of the PTC electric heater, and according to the PTC electric heater
  • the calorific value of the PTC electric heater is calculated by the calorific value and the cumulative time for the integral calculation.
  • the first control unit 60 controls the power switch tube, for example, the IGBT to be turned off, so that the amount of heat generated by the PTC electric heater remains constant for one switching period, for example, 30 seconds.
  • control system for the PTC electric heater for an electric vehicle uses a current integration algorithm to control the power switch tube, and can ensure that the heat generation amount of the PTC electric heater in each switching cycle is set.
  • the value is fixed, and does not change with the temperature at the start-up, the ambient temperature, and the amount of heat dissipation, so that the overall output heat is equal and the comfort is good.
  • the switching period of the power switching transistor is greater than the sampling period.
  • the switching period of the power switch can be 10-30 seconds, and the sampling period is usually a few milliseconds.
  • the first control unit 60 controls the power switch tube, such as the IGBT, to adopt a long-period (very low-frequency) switch control mode, and the power switch tube has a switching period of 10 ⁇ . Between 30 seconds (frequency 0.03 ⁇ 0.1Hz). Such a switching frequency can make the heating power control of the PTC electric heater more accurate, and the hot air blows does not affect the subjective feeling to the person, improves the comfort, and greatly reduces the external electromagnetic interference and the power switch tube. Switching loss.
  • the power (heat generation) of the PTC electric heater output is adjusted by the duty cycle control of closing and opening in one switching cycle.
  • the power switch tube can be closed for 5 seconds and disconnected for 25 seconds; when a larger output power is required, the power switch tube can remain closed at all times.
  • the long period has little effect on the temperature, but it can reduce the electromagnetic interference to a large extent and reduce the switching loss, making the IGBT heat dissipation design easier.
  • a control system for a PTC electric heater for an electric vehicle detects an operating current of a PTC electric heater by a current detecting unit, and samples an operating current by a current sampling unit to obtain a current sampling value, and then calculates The unit performs integral calculation on the current sampling value of each sampling period to obtain the calculated power of the PTC electric heater, and the first control unit controls the power when the power reaches the target power of the PTC electric heater in each switching cycle of the power switching tube.
  • the power switch tube controls the PTC electric heater to stop heating, so the present invention uses a current integration algorithm to control the power switch tube, so that the heat generated by the PTC electric heater in each switch cycle is consistent with the heat amount corresponding to the target power.
  • the overall output heat is equalized, the comfort is greatly improved, and the electromagnetic interference and the switching loss can be reduced, and the heating power control of the PTC electric heater is more accurate.
  • the above-described control system for a PTC electric heater for an electric vehicle further includes an acquisition unit 70 and a second control unit 80.
  • the obtaining unit 70 is configured to acquire the current in-vehicle thermal degree level parameter, the current wind speed level parameter, and the current outdoor ambient temperature
  • the second control unit 80 is configured to obtain according to the current in-vehicle thermal degree level parameter and the current wind speed level parameter. Wind temperature, and according to the current outdoor ambient temperature
  • the outlet air temperature is compensated such that the first control unit controls the power switch tube according to the compensated outlet air temperature to adjust the heat generation amount of the PTC electric heater.
  • the PTC electric heater can be equally divided into a plurality of heating levels, so that the heating level of the required PTC electric heater can be calculated or calibrated by the current air volume, the user's cold heat demand, and the outdoor ambient temperature.
  • the PTC electric heater maintains the energy waste caused by the high power constant high temperature heating state.
  • the mixing damper is kept in a state of full heat, and the heating capacity of the PTC electric heater is adjusted to meet the heating and heating demand of the user.
  • the adjustment of the calorific value of the PTC electric heater requires at least three variables, namely the thermal degree level parameter, the wind speed level parameter and the outdoor ambient temperature.
  • this variable represents the user's need for the outlet air temperature.
  • the system of PTC electric heater The thermal power should be larger to ensure that the outlet air temperature is constant; for outdoor ambient temperature, this variable indicates the temperature at which the inlet end of the PTC electric heater draws in natural wind, and in the colder winter, the heating power of the PTC electric heater It should be supplemented appropriately to ensure that the outlet temperature can meet the heating requirements.
  • the second control unit 80 can use the look-up table method to obtain the wind temperature, and then compensate the temperature by looking up the table, and then compensate the obtained air temperature according to the compensation temperature, and finally To meet the user's comfort requirements for heating under different working conditions.
  • the hot and cold degree level parameter-wind speed level parameter-outlet temperature table is shown in Table 1 above
  • the outdoor ambient temperature-compensation temperature table is shown in Table 2 above.
  • an embodiment of the present invention also proposes an electric vehicle including the above-described control system for a PTC electric heater for an electric vehicle.
  • the heating power of the PTC electric heater can be more accurately controlled by the above-mentioned control system of the PTC electric heater, so that the calorific value of the PTC electric heater in each switching cycle
  • the heat output corresponding to the target power is kept consistent, achieving an overall output heat equalization, greatly improving comfort, and also reducing electromagnetic interference and switching loss.
  • first and second are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Or implicitly indicate the number of technical features indicated. Thus, features defining “first” or “second” may include at least one of the features, either explicitly or implicitly. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless specifically defined otherwise.
  • the terms “installation”, “connected”, “connected”, “fixed” and the like shall be understood broadly, and may be either a fixed connection or a detachable connection, unless explicitly stated and defined otherwise. , or integrated; can be mechanical or electrical connection; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction of two elements, unless otherwise specified Limited.
  • the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.
  • the first feature "on” or “under” the second feature may be a direct contact of the first and second features, or the first and second features may be indirectly through an intermediate medium, unless otherwise explicitly stated and defined. contact.
  • the first feature "above”, “above” and “above” the second feature may be that the first feature is directly above or above the second feature, or merely that the first feature level is higher than the second feature.
  • the first feature “below”, “below” and “below” the second feature may be that the first feature is directly below or obliquely below the second feature, or merely that the first feature level is less than the second feature.

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  • Air-Conditioning For Vehicles (AREA)

Abstract

La présente invention concerne un procédé de commande d'un dispositif de chauffage électrique à coefficient de température positif (PTC pour Positive Temperature Coefficient) d'un véhicule électrique, comprenant les étapes suivantes consistant : à détecter des courants de travail d'un dispositif de chauffage électrique à coefficient de température positif ; à échantillonner les courants de travail pour obtenir des valeurs d'échantillonnage de courant et à effectuer un calcul intégral sur la valeur d'échantillonnage de courant de chaque période d'échantillonnage pour obtenir une puissance calculée du dispositif de chauffage électrique à coefficient de température positif ; à déterminer, pendant chaque période de commutation d'un transistor de commutation de puissance, si la puissance calculée atteint ou non la puissance cible du dispositif de chauffage électrique à coefficient de température positif ; si la puissance calculée atteint la puissance cible du dispositif de chauffage électrique à coefficient de température positif, à commander le dispositif de chauffage électrique à coefficient de température positif afin d'arrêter le chauffage en commandant le transistor de commutation de puissance de telle sorte que la quantité de chauffage du dispositif de chauffage électrique à coefficient de température positif pendant chaque période de commutation reste compatible avec la quantité de chauffage correspondant à la puissance cible. La présente invention porte également sur un système de commande d'un dispositif de chauffage électrique à coefficient de température positif d'un véhicule électrique, ainsi que sur un véhicule électrique.
PCT/CN2016/111150 2016-07-29 2016-12-20 Véhicule électrique, ainsi que procédé et système de commande d'un dispositif de chauffage électrique à coefficient de température positif (ptc) d'un véhicule électrique WO2018018834A1 (fr)

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