CN103939377A - Stepless speed regulation radiator fan control assembly and method - Google Patents
Stepless speed regulation radiator fan control assembly and method Download PDFInfo
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Abstract
The invention relates to a stepless speed regulation radiator fan control assembly and method. The stepless speed regulation radiator fan control assembly comprises a power supply, an ECU module, a PWM control module, at least two MOSFETs and fans, wherein the number of the fans is the same as that of the MOSFETs; a switch, a pressure sensor and a water-temperature sensor are connected with the ECU module through PWM rigid lines; a wheel speed sensor is connected with the ECU module through a finished automobile CAN line; a crank shaft rotating speed signal is connected with the ECU module through an engine LIN line; the ECU module and the PWM control module are in double-way connection through PWM rigid lines of pins of the PWM control module; the output line of the PWM control module is connected with the MOSFETs; the MOSFETs are connected with a fan motor; a fan motor feedback signal output line is connected with the PWM control module.
Description
Technical field
The invention belongs to radiator fan and control field, specifically refer to a kind of stepless speed regulation radiator fan control assembly and controlling method.
Background technique
Along with becoming increasingly prosperous of automobile market, oil consumption problem and the noise problem of client to automobile also more and more paid close attention to, and energy-saving and noise-reducing has become the content of paying close attention to of Automobile Design.Especially for powerful motor and motor, it is very important reducing energy consumption.
The high low speed electronic fan in electronic fan position generally using on current domestic passenger car, mode of speed regulation is generally series parallel connection or resistance type speed governing, and this mode of speed regulation can not realize the rotating speed of fan according to demand supplies, the characteristic of stepless speed regulation.
Summary of the invention
The object of the invention is the stepless adjustable function by realizing rotation speed of the fan, regulate as required to reach rotation speed of the fan, realize the effect of saving energy consumption.
One embodiment of the present of invention are achieved through the following technical solutions:
A kind of stepless speed regulation radiator fan control assembly, includes the fan of power supply, ECU module, PWM control module, at least two MOSFET field effect transistors and respective numbers;
Described power supply provides power supply for ECU module, PWM control module, MOSFET field effect transistor and fan electromotor;
Switch, pressure transducer and cooling-water temperature sensor are connected with ECU module by PWM rigid line;
Wheel speed sensors is connected with ECU module by car load CAN line;
Speed of crankshaft signal connects with ECU module by motor LIN line;
Described ECU module with PWM control module by two-way connection of PWM rigid line of PWM control module pin;
The outlet line of described PWM control module is connected with MOSFET field effect transistor; MOSFET field effect transistor connects fan electromotor;
Fan electromotor feedback signal outlet line connects PWM control module.
Described power supply is storage battery.
A kind of stepless speed regulation radiator fan controlling method, the steps include:
The water temperature signal that the demand signal that switch sends, the pressure signal that pressure transducer sends and engine water temperature sensor send inputs to ECU module by PWM rigid line;
Meanwhile, the vehicle speed signal that wheel speed sensors sends inputs to ECU module by car load CAN line; The engine operating condition signal that speed of crankshaft signal sends inputs to ECU module by motor LIN line;
Described ECU module obtains PWM command signal after above-mentioned signal is calculated, and this PWM command signal is the pwm control signal of PWM control module, is transferred to PWM control module by PWM control module pin;
PWM control module receives and comes from after the command signal that ECU sends, by the dutycycle of calculating input signal and according to communications protocol, export corresponding dutycycle to control each MOSFET field effect transistor, give different fan electromotors thereby export different power;
Fault message is fed back to PWM control module by described fan; PWM control module sends fault message to ECU control module by PWM rigid line.
The signal that described ECU module is transferred to PWM control module is achieved in the following ways:
When air-conditioning is closed, the PWM command signal that ECU module is transferred to PWM control module is to PWM control module according to the different water temperature dutycycle input PWM command signals in the shutdown signal situation in switching signal; Meanwhile, ECU module is arranged with in the middle speed of a motor vehicle or the high speed of a motor vehicle logical signal that postpones unlatching according to water temperature respectively;
When air-conditioning is opened, the signal demand that ECU module is transferred to PWM control module judge pressure and the speed of a motor vehicle of air-conditioning system, different pressure ranges and speed of a motor vehicle interval according to different water temperatures under accordingly duty cycle transmissions signal to PWM control module.
The water temperature dutycycle output that described air-conditioning is closed in situation is to carry out in such a way:
When X1≤X < X2, Y=A+K1 (X-X1)
When X2≤X < X3, Y=A+K1 (X2-X1)+K2 (X-X2)
……
Xn≤X < X
n+1time, Y=A+K1 (X2-X1)+K2 (X3-X2)+... Kn (X-Xn)
Wherein, Y is dutyfactor value, and A is the initial dutycycle threshold values of water temperature during lower than 90 DEG C, and Kn is the coefficient after n threshold values, Kn >=0 in this application, and X is actual water temperature, the water temperature that Xn is n threshold values, n is natural number in this application.
Situation when described air-conditioning is opened is that the water temperature dutycycle output of exporting in the water temperature dutycycle of same pressure range is to carry out in such a way:
When X1≤X < X2, Y=A+K1 (X-X1)
When X2≤X < X3, Y=A+K1 (X2-X1)+K2 (X-X2)
……
Xn≤X < X
n+1time, Y=A+K1 (X2-X1)+K2 (X3-X2)+... Kn (X-Xn)
Wherein, Y is dutyfactor value, and A is the initial dutycycle threshold values of water temperature during lower than 90 DEG C, and Kn is the coefficient after n threshold values, Kn >=0 in this application, and X is actual water temperature, the water temperature that Xn is n threshold values, n is natural number in this application;
Described pressure range includes,
1) P<L, now the speed of a motor vehicle can be any speed;
2) L≤P < M, now, the speed of a motor vehicle is divided into low speed, middling speed and high speed;
3) M≤P < H, now, the speed of a motor vehicle is divided into low speed, middling speed and high speed;
Wherein, the value of L is 1400KPa, and the value of M is 1950KPa, and the value of H is 2200KPa; Described low speed is that the speed of a motor vehicle is less than 40,000 ms/h; Described middling speed is 40,000 ms/h-80,000 ms/h; Described high speed is for being greater than 80,000 ms/h.
The dutycycle that described PWM control module is exported to fan electromotor is,
When the dutycycle of output is during at 0-7%, fan keeps previous state full-speed operation after 10 seconds;
In the time that the dutycycle of inputting is between 7%-13%, fan does not turn round;
In the time that the dutycycle of input increases gradually between 13-86%, fan work electric current also increases gradually;
In the time that the dutycycle of input is greater than 86%, fan keeps previous state full-speed operation after 10 seconds.
When described fan is not worked, the typical dutycycle of PWM control module output is 10%.
Described PWM control module output duty cycle signal is square wave electrical signal.
The invention has the beneficial effects as follows:
By the technical program, realize the stepless adjustable function of rotation speed of the fan, regulate as required to reach rotation speed of the fan, realize the effect of saving energy consumption.
Brief description of the drawings
Fig. 1 is the fan control schematic diagram of the function of invention;
Fig. 2 is control logic schematic diagram of the present invention;
Fig. 3 is communications protocol between PWM control module of the present invention and ECU module;
Fig. 4 is fan circuit schematic diagram of the present invention;
Fig. 5 is fan hardware connection diagram of the present invention;
Fig. 6 is the work contrast of fan of the present invention and common two stage fan.
Embodiment
Describe technological scheme of the present invention in detail by specific embodiment below, following embodiment is only exemplary, only can be used for explaining and technological scheme of the present invention being described, and can not to be interpreted as is the restriction to technical solution of the present invention.
As shown in Figures 1 to 6, be a kind of stepless speed regulation radiator fan control assembly embodiment, include the fan of power supply, ECU module, PWM control module, at least two MOSFET field effect transistors and respective numbers;
In this application, ECU module is also referred to as ECU, and English full name is electronic control unit, and Chinese is electronic control unit.
PWM control module is also referred to as PWM controller, and English full name is pulse width modulation, and Chinese is pulse duration modulation.
MOSFET field effect transistor, English full name is metal oxide semiconductor field effect transistor, Chinese is metal oxide semiconductor field effect tube.
Car load CAN line, English full name is controller area network, Chinese is controller local area network.
Motor LIN line, English full name is local interconnect network, Chinese is serial communication network.
As shown in Figure 6, what the step-like lines of top represented is the cooling performance line of existing two stage fan, the cooling performance line for the application PWM control fan of below.
Described power supply provides power supply for ECU module, PWM control module 3, MOSFET field effect transistor and fan electromotor; Power supply is in the present embodiment Vehicular accumulator cell, by being connected to fan electromotor, ECU module, PWM control module, MOSFET field effect transistor after wire harness, insurance.
Switch, pressure transducer and cooling-water temperature sensor are connected with ECU module by PWM rigid line; Switch request signal, pressure signal or water temperature signal can pass to ECU module by PWM rigid line respectively; The signal that switch request signal is opened and the signal of pass.
Wheel speed sensors is connected with ECU module by car load CAN line; The vehicle speed signal of wheel speed sensors passes to ECU module by car load CAN line.
Speed of crankshaft signal connects with ECU module by motor LIN line; Engine operating condition signal passes to ECU module by motor LIN line.
Described ECU module with PWM control module by two-way connection of PWM rigid line of PWM control module pin; ECU module and PWM control module can realize bidirectional data exchange like this.
The outlet line of described PWM control module is connected with MOSFET field effect transistor; MOSFET field effect transistor connects fan electromotor; MOSFET field effect transistor moves according to the duty cycle signals of PWM control module output, to control the running state of fan electromotor.
Fan electromotor feedback signal outlet line connects PWM control module.
PWM control module 3 of the present embodiment comes from reception after the signal instruction of ECU module, controls respectively the output services of two fan electromotors (1,2).In the present embodiment, PWM control module is to export respectively control signal by two independent MOSFET field effect transistors, realizes the independent control of two fan electromotors.
Concrete control mode is,
When the PWM of fan electromotor control module receives after the signal instruction that comes from ECU module, by the dutycycle of calculating input signal and according to communications protocol content, export corresponding dutycycle to control each MOSFET fet switch, give fan electromotor thereby export different power.
Judge by the operating voltage state of fan electromotor whether the work of fan electromotor has the faults such as overvoltage, short circuit, stall simultaneously, and take inner closed loop self-protection strategy; Fault message is fed back to car load ECU module by specific pwm signal simultaneously.
Concrete steps are:
The water temperature signal that the demand signal that switch sends, the pressure signal that pressure transducer sends and engine water temperature sensor send inputs to ECU module by PWM rigid line;
Meanwhile, the vehicle speed signal that wheel speed sensors sends inputs to ECU module by car load CAN line; The engine operating condition signal that speed of crankshaft signal sends inputs to ECU module by motor LIN line;
ECU module obtains PWM command signal after above-mentioned signal is calculated, and this PWM command signal is the pwm control signal of PWM control module, is transferred to PWM control module by PWM control module pin;
PWM control module receives and comes from after the command signal that ECU sends, by the dutycycle of calculating input signal and according to communications protocol, export corresponding dutycycle to control each MOSFET field effect transistor, give different fan electromotors thereby export different power;
Fault message is fed back to PWM control module by fan; PWM control module sends fault message to ECU control module by PWM rigid line.
The signal that ECU module is transferred to PWM control module is achieved in the following ways:
When air-conditioning is closed, the PWM command signal that ECU module is transferred to PWM control module is to PWM control module according to the different water temperature dutycycle input PWM command signals in the shutdown signal situation in switching signal; Meanwhile, ECU module is arranged with in the middle speed of a motor vehicle or the high speed of a motor vehicle logical signal that postpones unlatching according to water temperature respectively;
When air-conditioning is opened, the signal demand that ECU module is transferred to PWM control module judge pressure and the speed of a motor vehicle of air-conditioning system, different pressure ranges and speed of a motor vehicle interval according to different water temperatures under accordingly duty cycle transmissions signal to PWM control module.
The water temperature dutycycle output that described air-conditioning is closed in situation is to carry out in such a way:
When X1≤X < X2, Y=A+K1 (X-X1)
When X2≤X < X3, Y=A+K1 (X2-X1)+K2 (X-X2)
……
Xn≤X < X
n+1time, Y=A+K1 (X2-X1)+K2 (X3-X2)+... Kn (X-Xn)
Wherein, Y is dutyfactor value, and A is the initial dutycycle threshold values of water temperature during lower than 90 DEG C, and Kn is the coefficient after n threshold values, Kn >=0 in this application, and X is actual water temperature, the water temperature that Xn is n threshold values, n is natural number in this application.The value of A can change according to different vehicles, and A place herein need to carry out the confirmation of end value according to different vehicles or different engine displacement.
Situation when described air-conditioning is opened is that the water temperature dutycycle output of exporting in the water temperature dutycycle of same pressure range is to carry out in such a way:
When X1≤X < X2, Y=A+K1 (X-X1)
When X2≤X < X3, Y=A+K1 (X2-X1)+K2 (X-X2)
……
Xn≤X < X
n+1time, Y=A+K1 (X2-X1)+K2 (X3-X2)+... Kn (X-Xn)
Wherein, Y is dutyfactor value, and A is the initial dutycycle threshold values of water temperature during lower than 90 DEG C, and Kn is the coefficient after n threshold values, Kn >=0 in this application, and X is actual water temperature, the water temperature that Xn is n threshold values, n is natural number in this application.
In the time that air-conditioning is opened, the dutycycle threshold values of water temperature is in the time of same pressure range, and along with the increase of the speed of a motor vehicle, threshold temperature reduces.The dutycycle threshold values temperature in high pressure interval is higher than between low pressure zone or the threshold temperature of middle pressure range.
Described pressure range includes,
1) P<L, now the speed of a motor vehicle can be any speed;
2) L≤P < M, now, the speed of a motor vehicle is divided into low speed, middling speed and high speed;
3) M≤P < H, now, the speed of a motor vehicle is divided into low speed, middling speed and high speed;
Wherein, the value of L is 1400KPa, and the value of M is 1950KPa, and the value of H is 2200KPa; Described low speed is that the speed of a motor vehicle is less than 40,000 ms/h; Described middling speed is 40,000 ms/h-80,000 ms/h; Described high speed is for being greater than 80,000 ms/h.
That is to say, in the threshold temperature of M≤P≤H higher than L≤P≤M interval or P<L interval.
Linear function calculation method herein, be illustrated at this, such as in M≤P≤H interval, the speed of a motor vehicle is at 40,000 ms/h-80,000 ms/h, water temperature threshold values in the time of 96 DEG C is 60%, as the dutyfactor value Y=60%+5K of water temperature reality during at 101 DEG C, K is herein coefficient, in this application K >=0.
The dutycycle that described PWM control module is exported to fan electromotor is,
When the dutycycle of exporting is at 0-7%, while not comprising 7% herein, fan keeps previous state full-speed operation after 10 seconds;
In the time that the dutycycle of inputting is between 7%-13%, fan does not turn round;
In the time that the dutycycle of input increases gradually between 13-86%, do not comprise 13% and 86% herein, fan work electric current also increases gradually;
In the time that the dutycycle of input is greater than 86%, fan keeps previous state full-speed operation after 10 seconds.
When described fan is not worked, the typical dutycycle of PWM control module output is 10%.
Described PWM control module output duty cycle signal is square wave electrical signal.
The PWM command signal that ECU module described in the application is sent is the cooling system water temperature according to car load, the instruction calculating after air-conditioning system state and the speed of a motor vehicle match.
Embodiment
Different embodiments in the application adopt different actual water temperatures to calculate different dutyfactor values, other side is all identical, therefore, only one of them actual water temperature value is described in this application, actual water temperature for other can directly obtain according to formula, therefore, in this application other embodiment is no longer carried out to repeat specification.
The water temperature signal that the demand signal that switch sends, the pressure signal that pressure transducer sends and engine water temperature sensor send inputs to ECU module by PWM rigid line;
Meanwhile, the vehicle speed signal that wheel speed sensors sends inputs to ECU module by car load CAN line; The engine operating condition signal that speed of crankshaft signal sends inputs to ECU module by motor LIN line;
ECU module obtains PWM command signal after above-mentioned signal is calculated, and this PWM command signal is the pwm control signal of PWM control module, is transferred to PWM control module by PWM control module pin;
PWM control module receives and comes from after the command signal that ECU sends, by the dutycycle of calculating input signal and according to communications protocol, export corresponding dutycycle to control each MOSFET field effect transistor, give different fan electromotors thereby export different power;
Fault message is fed back to PWM control module by fan; PWM control module sends fault message to ECU control module by PWM rigid line.
The signal that ECU module is transferred to PWM control module is achieved in the following ways:
When air-conditioning is closed, the PWM command signal that ECU module is transferred to PWM control module is to PWM control module according to the different water temperature dutycycle input PWM command signals in the shutdown signal situation in switching signal; Meanwhile, ECU module is arranged with in the middle speed of a motor vehicle or the high speed of a motor vehicle logical signal that postpones unlatching according to water temperature respectively;
When air-conditioning is opened, the signal demand that ECU module is transferred to PWM control module judge pressure and the speed of a motor vehicle of air-conditioning system, different pressure ranges and speed of a motor vehicle interval according to different water temperatures under accordingly duty cycle transmissions signal to PWM control module.
The water temperature dutycycle output that described air-conditioning is closed in situation is to carry out in such a way:
When X1≤X < X2, Y=A+K1 (X-X1)
When X2≤X < X3, Y=A+K1 (X2-X1)+K2 (X-X2)
……
Xn≤X < X
n+1time, Y=A+K1 (X2-X1)+K2 (X3-X2)+... Kn (X-Xn)
Wherein, Y is dutyfactor value, and A is the initial dutycycle threshold values of water temperature during lower than 90 DEG C, and Kn is the coefficient after n threshold values, Kn >=0 in this application, and X is actual water temperature, the water temperature that Xn is n threshold values, n is natural number in this application.
Dutyfactor value while being 95 DEG C as actual coolant-temperature gage, adopts 90 DEG C to 96 DEG C intervals, wherein, X1=90, X2=96, X=95, therefore, dutyfactor value Y=A+5K1 95 DEG C time; Calculate again actual water temperature at the dutyfactor value of 98 DEG C simultaneously, adopt 96 DEG C to 100 DEG C intervals, now dutyfactor value Y=A+K1 (96-90)+K2 (the 98-96)=A+6K1+2K2 of 98 DEG C.The value of A can change according to different vehicles, and A place herein need to carry out the confirmation of end value according to different vehicles or different engine displacement; The value of Kn is carried out the confirmation of end value after by verification according to different vehicles or different engine displacement.
Situation when described air-conditioning is opened is that the water temperature dutycycle output of exporting in the water temperature dutycycle of same pressure range is to carry out in such a way:
When X1≤X < X2, Y=A+K1 (X-X1)
When X2≤X < X3, Y=A+K1 (X2-X1)+K2 (X-X2)
……
Xn≤X < X
n+1time, Y=A+K1 (X2-X1)+K2 (X3-X2)+... Kn (X-Xn)
Wherein, Y is dutyfactor value, and A is the initial dutycycle threshold values of water temperature during lower than 90 DEG C, and Kn is the coefficient after n threshold values, Kn >=0 in this application, and X is actual water temperature, the water temperature that Xn is n threshold values, n is natural number in this application.
Dutyfactor value while being 95 DEG C as actual coolant-temperature gage, adopts 90 DEG C to 96 DEG C intervals, wherein, X1=90, X2=96, X=95, therefore, dutyfactor value Y=A+5K1 95 DEG C time; Calculate again actual water temperature at the dutyfactor value of 98 DEG C simultaneously, adopt 96 DEG C to 100 DEG C intervals, now dutyfactor value Y=A+K1 (96-90)+K2 (the 98-96)=A+6K1+2K2 of 98 DEG C.The value of A can change according to different vehicles, and A place herein need to carry out the confirmation of end value according to different vehicles or different engine displacement; The value of Kn is carried out the confirmation of end value after by verification according to different vehicles or different engine displacement.
In the time that air-conditioning is opened, the dutycycle threshold values of water temperature is in the time of same pressure range, and along with the increase of the speed of a motor vehicle, threshold temperature reduces.The dutycycle threshold values temperature in high pressure interval is higher than between low pressure zone or the threshold temperature of middle pressure range.
Described pressure range includes,
1) P<L, now the speed of a motor vehicle can be any speed;
2) L≤P < M, now, the speed of a motor vehicle is divided into low speed, middling speed and high speed;
3) M≤P < H, now, the speed of a motor vehicle is divided into low speed, middling speed and high speed;
Wherein, the value of L is 1400KPa, and the value of M is 1950KPa, and the value of H is 2200KPa; Described low speed is that the speed of a motor vehicle is less than 40,000 ms/h; Described middling speed is 40,000 ms/h-80,000 ms/h; Described high speed is for being greater than 80,000 ms/h.
That is to say, in the threshold temperature of M≤P < H higher than L≤P < M interval or P<L interval.
In identical actual water temperature situation, in an embodiment taking 94 DEG C of water temperatures as example,
Dutycycle threshold values in the time of P<L is 20%;
In the time of L≤P < M, dutycycle threshold values when low speed is 50%, and dutycycle threshold values when middling speed is 35%, and dutycycle threshold values when high speed is 20%;
In the time of M≤P < H, dutycycle threshold values when low speed is 70%, and dutycycle threshold values when middling speed is 60%, and dutycycle threshold values when high speed is 50%.
When in air-conditioning unlatching situation, when P >=H, dutyfactor value is constant.
The dutycycle that described PWM control module is exported to fan electromotor is,
When the dutycycle of exporting is at 0-7%, while not comprising 7% herein, fan keeps previous state full-speed operation after 10 seconds;
In the time that the dutycycle of inputting is between 7%-13%, fan does not turn round;
In the time that the dutycycle of input increases gradually between 13-86%, do not comprise 13% and 86% herein, fan work electric current also increases gradually;
In the time that the dutycycle of input is greater than 86%, fan keeps previous state full-speed operation after 10 seconds.
When described fan is not worked, the typical dutycycle of PWM control module output is 10%.
Although illustrated and described embodiments of the invention, for the ordinary skill in the art, be appreciated that without departing from the principles and spirit of the present invention and can carry out multiple variation, amendment, replacement and modification to these embodiments, scope of the present invention is by claims and be equal to and limit.
Claims (9)
1. a stepless speed regulation radiator fan control assembly, is characterized in that: the fan that includes power supply, ECU module, PWM control module, at least two MOSFET field effect transistors and respective numbers;
Described power supply provides power supply for ECU module, PWM control module, MOSFET field effect transistor and fan electromotor;
Switch, pressure transducer and cooling-water temperature sensor are connected with ECU module by PWM rigid line;
Wheel speed sensors is connected with ECU module by car load CAN line;
Speed of crankshaft signal connects with ECU module by motor LIN line;
Described ECU module with PWM control module by two-way connection of PWM rigid line of PWM control module pin;
The outlet line of described PWM control module is connected with MOSFET field effect transistor; MOSFET field effect transistor connects fan electromotor;
Fan electromotor feedback signal outlet line connects PWM control module.
2. stepless speed regulation radiator fan control assembly according to claim 1, is characterized in that: described power supply is storage battery.
3. a stepless speed regulation radiator fan controlling method, is characterized in that: the steps include:
The water temperature signal that the demand signal that switch sends, the pressure signal that pressure transducer sends and engine water temperature sensor send inputs to ECU module by PWM rigid line;
Meanwhile, the vehicle speed signal that wheel speed sensors sends inputs to ECU module by car load CAN line; The engine operating condition signal that speed of crankshaft signal sends inputs to ECU module by motor LIN line;
Described ECU module obtains PWM command signal after above-mentioned signal is calculated, and this PWM command signal is the pwm control signal of PWM control module, is transferred to PWM control module by PWM control module pin;
PWM control module receives and comes from after the command signal that ECU sends, by the dutycycle of calculating input signal and according to communications protocol, export corresponding dutycycle to control each MOSFET field effect transistor, give different fan electromotors thereby export different power;
Fault message is fed back to PWM control module by described fan; PWM control module sends fault message to ECU control module by PWM rigid line.
4. stepless speed regulation radiator fan controlling method according to claim 3, is characterized in that: the signal that described ECU module is transferred to PWM control module is achieved in the following ways:
When air-conditioning is closed, the PWM command signal that ECU module is transferred to PWM control module is to PWM control module according to the different water temperature dutycycle input PWM command signals in the shutdown signal situation in switching signal; Meanwhile, ECU module is arranged with in the middle speed of a motor vehicle or the high speed of a motor vehicle logical signal that postpones unlatching according to water temperature respectively;
When air-conditioning is opened, the signal demand that ECU module is transferred to PWM control module judge pressure and the speed of a motor vehicle of air-conditioning system, different pressure ranges and speed of a motor vehicle interval according to different water temperatures under accordingly duty cycle transmissions signal to PWM control module.
5. stepless speed regulation radiator fan controlling method according to claim 4, is characterized in that: the water temperature dutycycle output that described air-conditioning is closed in situation is to carry out in such a way:
When X1≤X < X2, Y=A+K1 (X-X1)
When X2≤X < X3, Y=A+K1 (X2-X1)+K2 (X-X2)
……
Xn≤X < X
n+1time, Y=A+K1 (X2-X1)+K2 (X3-X2)+... Kn (X-Xn)
Wherein, Y is dutyfactor value, and A is the initial dutycycle threshold values of water temperature during lower than 90 DEG C, and Kn is the coefficient after n threshold values, Kn >=0 in this application, and X is actual water temperature, the water temperature that Xn is n threshold values, n is natural number in this application.
6. stepless speed regulation radiator fan controlling method according to claim 4, is characterized in that: situation when described air-conditioning is opened is, is to carry out in such a way in the water temperature dutycycle output of same pressure range:
When X1≤X < X2, Y=A+K1 (X-X1)
When X2≤X < X3, Y=A+K1 (X2-X1)+K2 (X-X2)
……
Xn≤X < X
n+1time, Y=A+K1 (X2-X1)+K2 (X3-X2)+... Kn (X-Xn)
Wherein, Y is dutyfactor value, and A is the initial dutycycle threshold values of water temperature during lower than 90 DEG C, and Kn is the coefficient after n threshold values, Kn >=0 in this application, and X is actual water temperature, the water temperature that Xn is n threshold values, n is natural number in this application;
Described pressure range includes,
1) P<L, now the speed of a motor vehicle can be any speed;
2) L≤P < M, now, the speed of a motor vehicle is divided into low speed, middling speed and high speed;
3) M≤P < H, now, the speed of a motor vehicle is divided into low speed, middling speed and high speed;
Wherein, the value of L is 1400KPa, and the value of M is 1950KPa, and the value of H is 2200KPa; Described low speed is that the speed of a motor vehicle is less than 40,000 ms/h; Described middling speed is 40,000 ms/h-80,000 ms/h; Described high speed is for being greater than 80,000 ms/h.
7. stepless speed regulation radiator fan controlling method according to claim 3, is characterized in that: the dutycycle that described PWM control module is exported to fan electromotor is,
When the dutycycle of output is during at 0-7%, fan keeps previous state full-speed operation after 10 seconds;
In the time that the dutycycle of inputting is between 7%-13%, fan does not turn round;
In the time that the dutycycle of input increases gradually between 13-86%, fan work electric current also increases gradually;
In the time that the dutycycle of input is greater than 86%, fan keeps previous state full-speed operation after 10 seconds.
8. stepless speed regulation radiator fan controlling method according to claim 7, is characterized in that: when described fan is not worked, the typical dutycycle of PWM control module output is 10%.
9. according to the stepless speed regulation radiator fan controlling method described in claim 3 or 7 or 8, it is characterized in that: described PWM control module output duty cycle signal is square wave electrical signal.
Priority Applications (1)
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