CN103089683A - Stepless speed regulation system of automobile air condition air blower - Google Patents

Stepless speed regulation system of automobile air condition air blower Download PDF

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Publication number
CN103089683A
CN103089683A CN201310058038XA CN201310058038A CN103089683A CN 103089683 A CN103089683 A CN 103089683A CN 201310058038X A CN201310058038X A CN 201310058038XA CN 201310058038 A CN201310058038 A CN 201310058038A CN 103089683 A CN103089683 A CN 103089683A
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China
Prior art keywords
speed regulation
blower
time adjustment
stepless speed
stepless time
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Pending
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CN201310058038XA
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Chinese (zh)
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李国军
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SICHUAN FANHUA ELECTRICAL CO Ltd
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SICHUAN FANHUA ELECTRICAL CO Ltd
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Priority to CN201310058038XA priority Critical patent/CN103089683A/en
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Abstract

The invention provides a stepless speed regulation system of an automobile air condition air blower. The stepless speed regulation system of the automobile air condition air blower comprises an air blower and a speed regulation switch. The stepless speed regulation system of the automobile air condition air blower further comprises a stepless speed regulation module. The speed regulation switch is connected with the stepless speed regulation module. The stepless speed regulation module is further connected with the air blower. According to the stepless speed regulation system of the automobile air condition air blower, due to the facts that the stepless speed regulation module is arranged in the system and a radiating component is arranged on the stepless speed regulation module, the stepless speed regulation module achieves the function of stepless speed regulation. The stepless speed regulation system of the automobile air condition air blower has the advantages of overcurrent protection, an obvious radiating effect and low power consumption. The stepless speed regulation system of the automobile air condition air blower is high in efficiency, energy-saving, strong in anti-electromagnetic interference capacity, stable in product quality and high in reliability.

Description

Blower for vehicle air conditioning stepless time adjustment system
Technical field
The present invention relates to a kind of speed control system, in particular, the present invention relates generally to a kind of blower for vehicle air conditioning stepless time adjustment system.
Background technique
The car air-conditioning system be realize that indoor air freezes to driving, the device of heating, ventilation and air purification.At present, blower speed governing in conventional car air conditioner, great majority are all to come speed governing by the mode of crosstalk resistance, utilize in electric motor loop the size of resistance to come regulating voltage, reach the purpose of adjusting rotation speed of fan.The resistance of low gear bit string is large, and the resistance of middle gear string is little, and high gear is not gone here and there resistance.Although this mode is simple in structure, the component cost is also low, and is easy to maintenance, and during blower fan work, quite a few power consumes in vain on resistance, and the speed adjusting resistance heating value is very large, needs in time heat radiation.Untimely if dispel the heat, easily cause self-burning of vehicle.For timely heat radiation, speed adjusting resistance is placed on the exhaust outlet of warm-air drier usually, utilizes warm-air drier to speed adjusting resistance blowing heat radiation.Warm-air drier is normally dried, and the temperature of speed adjusting resistance will be stabilized in a comparatively safe scope.If the warm braw motor breaks down, because the reasons such as motor rotation blockage, fan blade come off, motor short circuit cause not air-out, the temperature of speed adjusting resistance will rise rapidly, finally may with around working of plastics etc. ignite.
In novel car air conditioner, speed adjusting module is adopted in the blower speed governing more, produce pwm signal power ratio control field effect transistor by microcomputer and come speed governing, this speed regulating method has that the switching frequency high, low speed is stable, dynamic performance is good, the efficient advantages of higher, is easy to realize in single-chip computer control system.In present automobile air conditioner control system both domestic and external, the problem of low power consumption is not nearly all considered in the design of ECU (Electrical Control Unit).In fact, throughout the year, driver is limited to the use of air-conditioning, but after automobile one igniting, conditioning control unit is start just, no matter use or do not use air-conditioning all can consume in vain a part of electric energy, this and the world today advocate " energy-conserving and environment-protective " and disagree in the process of whole driving.
Summary of the invention
Consider the problems referred to above of prior art, according to an aspect disclosed by the invention, the present invention is by the following technical solutions: a kind of blower for vehicle air conditioning stepless time adjustment system, comprise be used to the blower that is arranged at outward bulge wind in car air conditioner and speed control switch that the car air conditioner wind speed is regulated, described speed control system also comprises the stepless time adjustment module that regulates and controls wind speed by circuit, speed control switch is connected with the stepless time adjustment module by conduction, speed control switch is also regulated control to the stepless time adjustment module, and the stepless time adjustment module connects blower again.
Further technological scheme is: described stepless time adjustment module comprises power supply unit of voltage regulation, driver element, input processing unit, control unit and over-current protecting unit, the power supply of power supply unit of voltage regulation after with step-down passes to the control unit that is attached thereto, the input end of input processing unit connects power supply unit of voltage regulation, the output terminal connection control unit, driver element one end is connected with control unit, the other end is connected with over-current protecting unit, and over-current protecting unit is connected with blower again;
Further technological scheme is: the described heat-dissipating part that is comprised of Heat sink that also is provided with on the stepless time adjustment module;
Further technological scheme is: the described driver element of institute and over-current protecting unit all are provided with switching circuit, carry out switch by control unit and control;
Compared with prior art, one of beneficial effect of the present invention is: the present invention adopts and designed the stepless time adjustment module in system, in addition module is provided with heat-dissipating part; this module realizes function of stepless speed regulation; have overcurrent protection, radiating effect is obvious, the characteristics of low power consumption.Energy-efficient, anti-electromagnetic interference capability is strong, constant product quality, and reliability is high.
Description of drawings
Fig. 1 is structural representation of the present invention;
Fig. 2 is stepless time adjustment modular unit component diagram of the present invention;
Fig. 3 is circuit diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further elaborated.
Consider the problems referred to above of prior art, according to an aspect disclosed by the invention, the present invention is by the following technical solutions: as shown in Figure 1, a kind of blower for vehicle air conditioning stepless time adjustment system, comprise blower 103 and speed control switch 102, speed control system also comprises stepless time adjustment module 101, speed control switch 102 is connected with stepless time adjustment module 101, according to embodiments of the invention, for example speed control switch 102 connection of being connected with the stepless time adjustment module can be to connect by wire, can be also to connect by vlsi circuitry; Stepless time adjustment module 101 connects blower 103 again, and system mainly is comprised of blower stepless speed regulation module 101, speed control switch 102, blower 103 etc., selects the air quantity gear by speed control switch 102, and speed adjusting module 101 changes air quantity accordingly.The basic ideas of this blower for vehicle air conditioning stepless speed regulation module 101 are: adopt the fixed frequency modulated PWM method to make single-chip microcomputer produce the pwm signal of 17.8KHz ± 1KHz, drive the MOSFET main switch element of 2 parallel connections through overdrive circuit, change the average voltage at blower armature two ends with the mode by the change dutycycle, thereby reach the purpose of speed governing.For realizing overcurrent protection; grounding end at main switch element seals in the sample resistance silk; utilize the electric current of series connection to equate principle, the sampling current small-signal by the amplification of the over-current protection circuit that consisted of by operational amplifier, relatively after, single-chip microcomputer just can detect the current situation by main switch element.In time dispel the heat for making main switch element and responding fast diode, a radiator is installed, be connected by screw and make its held against heat sink, reach the heat radiation purpose.But the modes such as single-chip microcomputer that the design of low power consumption is selection, controllable electric power and the software timing by power supply chip wakes standby up realize.
according to a further advantageous embodiment of the invention, as shown in Figure 2, described stepless time adjustment module 101 comprises power supply unit of voltage regulation 201, driver element 204, input processing unit 202, control unit 203 and over-current protecting unit 205, power supply unit of voltage regulation 201 passes to the power supply after step-down the control unit 203 that is attached thereto, the input end of input processing unit 202 connects power supply unit of voltage regulation, output terminal connection control unit 203, driver element 204 1 ends are connected with control unit 203, the other end is connected with over-current protecting unit 205, over-current protecting unit 205 is connected with blower 103 again.
Power supply requirement two-stage in power supply unit of voltage regulation 201, module, one-level is the drive circuit power supply, requires 12V.Another grade is the 5V power supply that single-chip microcomputer and input circlult etc. require.Due to the abominable situation that will consider low power consumption and automobile power source, elementary voltage stabilizing is to the power supply chip selector switch type Voltage stabilizing module of 12V, LM2575T-12.0, to realize the low power consumption output under high input voltage, external reference diode V3, inductance L 2 and filter capacitor C7, C6, C8 just consist of mu balanced circuit.The NCV4274ADS50R4G of ON company is selected in secondary voltage stabilizing to the power supply chip of 5V, the every 1mA load of this device power consumption: 150uA, and have the function of overcurrent, overvoltage, overheat protector, peripheral components is few.For guaranteeing that single-chip microcomputer has good power environment, avoid interference, also add transient voltage suppressor V4 at the output terminal of 5V power supply, even there is interference also can eliminate.
Input processing unit 202, input processing circuit is comprised of resistance R 1, R2, capacitor C 1 and diode V1, V2, realize the collection of switching signal, blower speed control switch inside is variable resistor, and the R2 in this input circlult enough becomes bleeder circuit with it, and the air quantity shift transformation is become voltage signal, R1, C1 are the RC eliminator, V1, the V2 volt circuit that is limited prevents that too high peak voltage from entering 2 pin of single-chip microcomputer, its band AD mouth.Single-chip microcomputer just can have been judged the variation of speed control switch gear after completing the AD conversion.Certainly, for the reliability of sampling, the software filtering method of averaging for N time of taking on software to sample is eliminated error.
Control unit 203, control unit 203 uses single-chip microcomputers, and single-chip microcomputer is selected FREESCALE single-chip microcomputer MC68HC908 series, and its performance is good, function is strong, speed is high, be 8 very high 8-digit microcontrollers of cost performance.Have security protection feature, comprise that the house dog supervision resets, the detection of the low voltage limit resets, the disable instruction detection resets and the illegal address inspection resets.Consider that this speed adjusting module practical function only needs 6 I/O mouth pins, select to have the single-chip microcomputer MC68HC908QT2 of 8 pins, because it can use internal oscillator circuit, need not external crystal oscillation circuit, greatly improve reliable.The QT2 single-chip microcomputer is power consumption 6mA when operating mode, and power consumption 1mA during standby mode utilizes this characteristic, but power saving.Concrete grammar is, when Software for Design, in the situation that needs blower work, allows single-chip microcomputer be in operating mode, other the time be in standby mode.Implementation method is, utilizes the method for timing wake-up, a timer of programming monolithic processor inside; 10mS interrupts once; regularly 0.1S, both determined whether 10 interruptions, if be less than in interrupt routine; after returning, interruption keeps standby mode; if arrive, detect the gear whether speed control switch is once arranged and change (what in fact detect is the size of voltage), if do not have; enter standby mode, turn off simultaneously the power supply of drive circuit and over-current protection circuit.If have, withdraw from standby mode, enter operating mode, open simultaneously the power supply of drive circuit and over-current protection circuit.Like this, speed adjusting module is in spare time, and 95% time all is in standby mode, reaches the purpose of power saving.
Driver element 204, drive circuit drives Si Mite reverser HEF40106BT by switching circuit (resistance R 5, R6, R7 and triode Q1), and there are 6 reversers its inside, adopts the parallel drive mode, and driving force is strong like this, and the PWM waveform is complete.Drive at last the field effect transistor IRF540N of two parallel connections.Why using two, is in order to reduce the internal resistance of pipe, to reduce heating value.And general domestic supporting business, is return but such result is three a large amount of parcel posts often only with one in order to reduce costs.Also has a response diode V7(MUR1560 fast in circuit); its effect is the inverse electromotive force of eliminating motor; the protection field effect transistor can not punctured by too high inverse electromotive force; due to continuous firing; it also can produce higher heat; the effect of capacitor C 8 is in order to make pwm signal level and smooth, to prevent from producing when high-low level from changing peak voltage.Certainly, these measures also are not enough to guarantee the safety of field effect transistor, also must dispel the heat, and the design of radiating structure is discussed in the back.Consider the design of low power consumption, drive circuit the 12V power supply controlled, the switching circuit that is comprised of triode Q3 and R19 is controlled, in the situation that need blower work, single-chip microcomputer just makes its energising.
Over-current protecting unit 205 seals in sample resistance silk RS at the leakage level common ground end of parallel field effect pipe, utilizes the electric current of series connection to equate principle, and the voltage on RS changes along with the curent change of motor load, and electric current is large, and the voltage at RS two ends is also high.The resistance of resistance wire is very little, is less than 0.1 Europe.Therefore, the voltage signal on sample resistance is very little, and after the in-phase amplification circuit by being made of operational amplifier, the processing of comparison circuit, single-chip microcomputer just can detect the current situation by main switch element.Consider the automobile application, amplifier is selected LM2902, wide temperature range ,-40 ℃～125 ℃.For low power dissipation design, the power supply of amplifier and pull-up resistor R17 is controlled by the switch power that triode Q2 and R18 form.In the situation that need blower work, single-chip microcomputer just makes its energising.
" embodiment " who speaks of in this manual, " another embodiment ", " embodiment ", etc., refer to specific features, structure or the characteristics described in conjunction with this embodiment and be included at least one embodiment that the application's generality describes.A plurality of local appearance statement of the same race is not necessarily to refer to same embodiment in specification.Furthermore, when describing a specific features, structure or characteristics in conjunction with arbitrary embodiment, what advocate is to realize that in conjunction with other embodiments this feature, structure or characteristics also fall within the scope of the invention.
Although invention has been described with reference to a plurality of explanatory embodiments of the present invention here, but, should be appreciated that, those skilled in the art can design a lot of other modification and mode of executions, and these are revised and within mode of execution will drop on the disclosed principle scope and spirit of the application.More particularly, in the scope of, accompanying drawing open in the application and claim, can carry out multiple modification and improvement to constituent elements and/or the layout of subject combination layout.Except modification that constituent elements and/or layout are carried out with improving, to those skilled in the art, other purposes will be also obvious.

Claims (4)

1. blower for vehicle air conditioning stepless time adjustment system, comprise be used to the blower that is arranged at outward bulge wind in car air conditioner and speed control switch that the car air conditioner wind speed is regulated, it is characterized in that: described speed control system also comprises the stepless time adjustment module that regulates and controls wind speed by circuit, speed control switch is connected with the stepless time adjustment module, speed control switch is also regulated control to the stepless time adjustment module, and the stepless time adjustment module connects blower again.
2. blower for vehicle air conditioning stepless time adjustment system according to claim 1; it is characterized in that: described stepless time adjustment module comprises power supply unit of voltage regulation, driver element, input processing unit, control unit and over-current protecting unit; the power supply of power supply unit of voltage regulation after with step-down passes to the control unit that is attached thereto; the input end of input processing unit connects power supply unit of voltage regulation; the output terminal connection control unit; driver element one end is connected with control unit; the other end is connected with over-current protecting unit, and over-current protecting unit is connected with blower again.
3. blower for vehicle air conditioning stepless time adjustment system according to claim 1, is characterized in that: the described heat-dissipating part that is comprised of Heat sink that also is provided with on the stepless time adjustment module.
4. blower for vehicle air conditioning stepless time adjustment system according to claim 2, it is characterized in that: described driver element and over-current protecting unit all are provided with switching circuit, carry out switch by control unit and control.
CN201310058038XA 2013-02-22 2013-02-22 Stepless speed regulation system of automobile air condition air blower Pending CN103089683A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104696250A (en) * 2013-12-10 2015-06-10 中国航空工业第六一八研究所 Stable control method for rotating speed of axial flow fan
CN104763667A (en) * 2015-04-01 2015-07-08 浙江毅力汽车空调有限公司 Air blower speed regulating system of automobile
CN105003455A (en) * 2015-08-17 2015-10-28 安徽江淮松芝空调有限公司 Blower speed governing module device
CN105539066A (en) * 2015-12-25 2016-05-04 博耐尔汽车电气系统有限公司 Air volume speed regulation circuit for automobile air conditioner

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2463212Y (en) * 2001-02-05 2001-12-05 上海开利运输冷气设备有限公司 Stepless speed-regulating device for air-conditioning fan in bus
CN2757426Y (en) * 2004-12-30 2006-02-08 任生力 Electronic speed changing switch for vehicle fan
JP2009071954A (en) * 2007-09-12 2009-04-02 Yazaki Corp Method and apparatus for controlling electric fan for vehicle
CN201412377Y (en) * 2009-05-26 2010-02-24 广州精益汽车空调有限公司 Stepless speed regulation module for vehicle air conditioning fan
US20100141031A1 (en) * 2007-03-07 2010-06-10 Denso Corporation Load driving method and device
CN202149050U (en) * 2011-06-27 2012-02-22 武汉奥泽电子有限公司 Speed regulation device for air blower of automotive air conditioner
CN203130573U (en) * 2013-02-22 2013-08-14 四川泛华电器有限责任公司 Electrodeless speed regulating system of automobile air conditioner air blower

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2463212Y (en) * 2001-02-05 2001-12-05 上海开利运输冷气设备有限公司 Stepless speed-regulating device for air-conditioning fan in bus
CN2757426Y (en) * 2004-12-30 2006-02-08 任生力 Electronic speed changing switch for vehicle fan
US20100141031A1 (en) * 2007-03-07 2010-06-10 Denso Corporation Load driving method and device
JP2009071954A (en) * 2007-09-12 2009-04-02 Yazaki Corp Method and apparatus for controlling electric fan for vehicle
CN201412377Y (en) * 2009-05-26 2010-02-24 广州精益汽车空调有限公司 Stepless speed regulation module for vehicle air conditioning fan
CN202149050U (en) * 2011-06-27 2012-02-22 武汉奥泽电子有限公司 Speed regulation device for air blower of automotive air conditioner
CN203130573U (en) * 2013-02-22 2013-08-14 四川泛华电器有限责任公司 Electrodeless speed regulating system of automobile air conditioner air blower

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104696250A (en) * 2013-12-10 2015-06-10 中国航空工业第六一八研究所 Stable control method for rotating speed of axial flow fan
CN104763667A (en) * 2015-04-01 2015-07-08 浙江毅力汽车空调有限公司 Air blower speed regulating system of automobile
CN104763667B (en) * 2015-04-01 2016-06-15 浙江毅力汽车空调有限公司 Automotive air blowers velocity control system
CN105003455A (en) * 2015-08-17 2015-10-28 安徽江淮松芝空调有限公司 Blower speed governing module device
CN105539066A (en) * 2015-12-25 2016-05-04 博耐尔汽车电气系统有限公司 Air volume speed regulation circuit for automobile air conditioner

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Application publication date: 20130508