CN103939377B - A kind of stepless speed regulation radiator fan controls assembly and method - Google Patents
A kind of stepless speed regulation radiator fan controls assembly and method Download PDFInfo
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- CN103939377B CN103939377B CN201410189393.5A CN201410189393A CN103939377B CN 103939377 B CN103939377 B CN 103939377B CN 201410189393 A CN201410189393 A CN 201410189393A CN 103939377 B CN103939377 B CN 103939377B
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Abstract
The present invention relates to a kind of stepless speed regulation radiator fan and control assembly and controlling method, include the fan of power supply, ECU module, PWM control module, at least two MOSFET field effect transistors and respective numbers; Switch, pressure transducer and cooling-water temperature sensor are by PWM rigid line and ECU model calling; Wheel speed sensors is by car load CAN line and ECU model calling; Speed of crankshaft signal passes through motor LIN line with ECU model calling; Described ECU module and PWM control module are bi-directionally connected by the 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.
Description
Technical field
The invention belongs to radiator fan and control field, specifically refer to that a kind of stepless speed regulation radiator fan controls assembly and controlling method.
Background technique
Along with becoming increasingly prosperous of automobile market, client also more and more pays close attention to the oil consumption problem of automobile and noise problem, and what energy-saving and noise-reducing had become Automobile Design pays close attention to content.Especially for powerful motor and motor, it is very important for reducing energy consumption.
The high low speed electronic fan in the electronic fan position that current domestic passenger car generally uses, 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, regulating 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 controls 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 is ECU module, PWM control module, MOSFET field effect transistor and fan electromotor provide power supply;
Switch, pressure transducer and cooling-water temperature sensor are by PWM rigid line and ECU model calling;
Wheel speed sensors is by car load CAN line and ECU model calling;
Speed of crankshaft signal passes through motor LIN line with ECU model calling;
Described ECU module and PWM control module are bi-directionally connected by the 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 pressure signal that the demand signal that switch sends, pressure transducer send and the water temperature signal that engine water temperature sensor sends input 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 being calculated by above-mentioned signal, 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;
After PWM control module receives and comes from command signal that ECU sends, by calculate input signal dutycycle and according to communications protocol, export corresponding dutycycle to control each MOSFET field effect transistor, thus export different power and give different fan electromotors;
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.
Described ECU module transfer is achieved in the following ways to the signal of PWM control module:
When air-conditioning is closed, ECU module transfer is to PWM control module according to the different water temperature dutycycle input PWM command signals in the shutdown signal situation in switching signal to the PWM command signal of PWM control module; Meanwhile, ECU module is arranged with the logical signal postponing unlatching according to water temperature respectively in the middle speed of a motor vehicle or the high speed of a motor vehicle;
When air-conditioning is opened, ECU module transfer judges pressure and the speed of a motor vehicle of air-conditioning system to the signal demand of PWM control module, under different pressure ranges and vehicle speed intervals are according to different water temperature accordingly duty cycle transmissions signal to PWM control module.
It is carry out in such a way that water temperature dutycycle in described air-conditioning closedown situation exports:
During X1≤X < X2, Y=A+K1 (X-X1)
During 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, A be water temperature lower than initial dutycycle threshold values when 90 DEG C, Kn is the coefficient after the n-th threshold values, in this application Kn >=0, and X is actual water temperature, and Xn is the water temperature of the n-th threshold values, and n is natural number in this application.
Situation when described air-conditioning is opened is, the water temperature dutycycle output exported in the water temperature dutycycle of same pressure range carries out in such a way:
During X1≤X < X2, Y=A+K1 (X-X1)
During 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, A be water temperature lower than initial dutycycle threshold values when 90 DEG C, Kn is the coefficient after the n-th threshold values, in this application Kn >=0, and X is actual water temperature, and Xn is the water temperature of the n-th threshold values, and 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 the value of L to be the value of 1400KPa, M be 1950KPa, 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 m/h-80 thousand ms/h; Described high speed is for being greater than 80,000 ms/h.
The dutycycle that described PWM control module exports to fan electromotor is,
When the dutycycle exported is at 0-7%, fan keeps previous state full-speed operation after 10 seconds;
When the dutycycle inputted is between 7%-13%, fan does not operate;
When the dutycycle inputted increases gradually between 13-86%, fan work electric current also increases gradually;
When the dutycycle inputted is greater than 86%, fan keeps previous state full-speed operation after 10 seconds.
When described fan does not work, the typical duty cycle ratio that PWM control module exports 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.
Accompanying drawing explanation
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 signal wiring schematic diagram of the present invention;
Fig. 6 is that the work of fan of the present invention and common two stage fan contrasts.
Embodiment
Describe technological scheme of the present invention in detail below by way of specific embodiment, following embodiment is only exemplary, only can be used for explaining and technological scheme of the present invention being described, and can not be interpreted as being the restriction to technical solution of the present invention.
As shown in Figures 1 to 6, for a kind of stepless speed regulation radiator fan controls assembly embodiment, the fan of power supply, ECU module, PWM control module, at least two MOSFET field effect transistors and respective numbers is included;
In this application, ECU module is also referred to as ECU, and English full name is electroniccontrolunit, and Chinese is electronic control unit.
PWM control module is also referred to as PWM controller, and English full name is pulsewidthmodulation, and Chinese is pulse duration modulation.
MOSFET field effect transistor, English full name is metaloxidesemiconductorfieldeffecttransistor, and Chinese is metal oxide semiconductor field effect tube.
Car load CAN line, English full name is controllerareanetwork, and Chinese is controller local area network.
Motor LIN line, English full name is localinterconnectnetwork, and Chinese is serial communications network.
As shown in Figure 6, the cooling performance line of what the step-like lines of top represented is existing two stage fan, below control the cooling performance line of fan for the application PWM.
Described power supply is ECU module, PWM control module 3, MOSFET field effect transistor and fan electromotor provide power supply; 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 by PWM rigid line and ECU model calling; Switch request signal, pressure signal or water temperature signal can pass to ECU module respectively by PWM rigid line; The signal of the signal that namely switch request signal is opened and pass.
Wheel speed sensors is by car load CAN line and ECU model calling; The vehicle speed signal of wheel speed sensors passes to ECU module by car load CAN line.
Speed of crankshaft signal passes through motor LIN line with ECU model calling; Engine operating condition signal passes to ECU module by motor LIN line.
Described ECU module and PWM control module are bi-directionally connected by the PWM rigid line of PWM control module pin; Such ECU module and PWM control module can realize bidirectional data exchange.
The outlet line of described PWM control module is connected with MOSFET field effect transistor; MOSFET field effect transistor connects fan electromotor; The duty cycle signals that MOSFET field effect transistor exports according to PWM control module carries out action, to control the running state of fan electromotor.
Fan electromotor feedback signal outlet line connects PWM control module.
The present embodiment PWM control module 3, after reception comes from the signal instruction of ECU module, controls the output services of two fan electromotors (1,2) respectively.In the present embodiment, PWM control module exports control signal respectively by two independent MOSFET field effect transistors, realizes the independent control of two fan electromotors.
Concrete control mode is,
After the PWM control module of fan electromotor receives the signal instruction coming from ECU module, by calculate input signal dutycycle and according to communications protocol content, export corresponding dutycycle to control each MOSFET fet switch, thus export different power and give fan electromotor.
Judge whether the work of fan electromotor has the faults such as overvoltage, short circuit, stall by the operating voltage state of fan electromotor simultaneously, and take internal closed loop self-protection strategy; Fault message is fed back to car load ECU module by specific pwm signal simultaneously.
Concrete steps are:
The pressure signal that the demand signal that switch sends, pressure transducer send and the water temperature signal that engine water temperature sensor sends input 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 being calculated by above-mentioned signal, 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;
After PWM control module receives and comes from command signal that ECU sends, by calculate input signal dutycycle and according to communications protocol, export corresponding dutycycle to control each MOSFET field effect transistor, thus export different power and give different fan electromotors;
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.
ECU module transfer is achieved in the following ways to the signal of PWM control module:
When air-conditioning is closed, ECU module transfer is to PWM control module according to the different water temperature dutycycle input PWM command signals in the shutdown signal situation in switching signal to the PWM command signal of PWM control module; Meanwhile, ECU module is arranged with the logical signal postponing unlatching according to water temperature respectively in the middle speed of a motor vehicle or the high speed of a motor vehicle;
When air-conditioning is opened, ECU module transfer judges pressure and the speed of a motor vehicle of air-conditioning system to the signal demand of PWM control module, under different pressure ranges and vehicle speed intervals are according to different water temperature accordingly duty cycle transmissions signal to PWM control module.
It is carry out in such a way that water temperature dutycycle in described air-conditioning closedown situation exports:
During X1≤X < X2, Y=A+K1 (X-X1)
During 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, A be water temperature lower than initial dutycycle threshold values when 90 DEG C, Kn is the coefficient after the n-th threshold values, in this application Kn >=0, and X is actual water temperature, and Xn is the water temperature of the n-th threshold values, and n is natural number in this application.The value of A can change according to different vehicles, and A place herein needs the confirmation carrying out end value according to different vehicles or different engine displacement.
Situation when described air-conditioning is opened is, the water temperature dutycycle output exported in the water temperature dutycycle of same pressure range carries out in such a way:
During X1≤X < X2, Y=A+K1 (X-X1)
During 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, A be water temperature lower than initial dutycycle threshold values when 90 DEG C, Kn is the coefficient after the n-th threshold values, in this application Kn >=0, and X is actual water temperature, and Xn is the water temperature of the n-th threshold values, and n is natural number in this application.
When air-conditioning is opened, the dutycycle threshold values of water temperature is when same pressure range, and along with the increase of the speed of a motor vehicle, threshold temperature reduces.The dutycycle threshold 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 the value of L to be the value of 1400KPa, M be 1950KPa, 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 m/h-80 thousand ms/h; Described high speed is for being greater than 80,000 ms/h.
That is, interval or P<L is interval higher than L≤P≤M in the threshold temperature of M≤P≤H.
Linear function calculation method herein, be illustrated at this, such as interval at M≤P≤H, the speed of a motor vehicle is at 40,000 m/h-80 thousand ms/h, water temperature threshold values 96 DEG C time is 60%, dutyfactor value Y=60%+5K when water temperature reality is at 101 DEG C, K is herein coefficient, in this application K >=0.
The dutycycle that described PWM control module exports to fan electromotor is,
When the dutycycle exported is at 0-7%, when not comprising 7% herein, fan keeps previous state full-speed operation after 10 seconds;
When the dutycycle inputted is between 7%-13%, fan does not operate;
When the dutycycle inputted increases gradually between 13-86%, do not comprise 13% and 86% herein, fan work electric current also increases gradually;
When the dutycycle inputted is greater than 86%, fan keeps previous state full-speed operation after 10 seconds.
When described fan does not work, the typical duty cycle ratio that PWM control module exports 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 sends is the cooling system water temperature according to car load, the instruction calculated 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 carry out calculating 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 no longer repeat specification is carried out to other embodiment.
The pressure signal that the demand signal that switch sends, pressure transducer send and the water temperature signal that engine water temperature sensor sends input 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 being calculated by above-mentioned signal, 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;
After PWM control module receives and comes from command signal that ECU sends, by calculate input signal dutycycle and according to communications protocol, export corresponding dutycycle to control each MOSFET field effect transistor, thus export different power and give different fan electromotors;
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.
ECU module transfer is achieved in the following ways to the signal of PWM control module:
When air-conditioning is closed, ECU module transfer is to PWM control module according to the different water temperature dutycycle input PWM command signals in the shutdown signal situation in switching signal to the PWM command signal of PWM control module; Meanwhile, ECU module is arranged with the logical signal postponing unlatching according to water temperature respectively in the middle speed of a motor vehicle or the high speed of a motor vehicle;
When air-conditioning is opened, ECU module transfer judges pressure and the speed of a motor vehicle of air-conditioning system to the signal demand of PWM control module, under different pressure ranges and vehicle speed intervals are according to different water temperature accordingly duty cycle transmissions signal to PWM control module.
It is carry out in such a way that water temperature dutycycle in described air-conditioning closedown situation exports:
During X1≤X < X2, Y=A+K1 (X-X1)
During 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, A be water temperature lower than initial dutycycle threshold values when 90 DEG C, Kn is the coefficient after the n-th threshold values, in this application Kn >=0, and X is actual water temperature, and Xn is the water temperature of the n-th threshold values, and n is natural number in this application.
As dutyfactor value when actual coolant-temperature gage is 95 DEG C, adopt 90 DEG C to 96 DEG C intervals, wherein, X1=90, X2=96, X=95, therefore, dutyfactor value Y=A+5K1 when 95 DEG C; Calculate actual water temperature again 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 needs the confirmation carrying out end value according to different vehicles or different engine displacement; The value of Kn according to different vehicles or different engine displacement by carrying out the confirmation of end value after verification.
Situation when described air-conditioning is opened is, the water temperature dutycycle output exported in the water temperature dutycycle of same pressure range carries out in such a way:
During X1≤X < X2, Y=A+K1 (X-X1)
During 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, A be water temperature lower than initial dutycycle threshold values when 90 DEG C, Kn is the coefficient after the n-th threshold values, in this application Kn >=0, and X is actual water temperature, and Xn is the water temperature of the n-th threshold values, and n is natural number in this application.
As dutyfactor value when actual coolant-temperature gage is 95 DEG C, adopt 90 DEG C to 96 DEG C intervals, wherein, X1=90, X2=96, X=95, therefore, dutyfactor value Y=A+5K1 when 95 DEG C; Calculate actual water temperature again 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 needs the confirmation carrying out end value according to different vehicles or different engine displacement; The value of Kn according to different vehicles or different engine displacement by carrying out the confirmation of end value after verification.
When air-conditioning is opened, the dutycycle threshold values of water temperature is when same pressure range, and along with the increase of the speed of a motor vehicle, threshold temperature reduces.The dutycycle threshold 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 the value of L to be the value of 1400KPa, M be 1950KPa, 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 m/h-80 thousand ms/h; Described high speed is for being greater than 80,000 ms/h.
That is, interval or P<L is interval higher than L≤P < M in the threshold temperature of M≤P < H.
In identical actual water temperature situation, for 94 DEG C of water temperatures in an embodiment,
Dutycycle threshold values when P<L is 20%;
When L≤P < M, dutycycle threshold values during low speed is 50%, and dutycycle threshold values during middling speed is 35%, and dutycycle threshold values during high speed is 20%;
When M≤P < H, dutycycle threshold values during low speed is 70%, and dutycycle threshold values during middling speed is 60%, and dutycycle threshold values during high speed is 50%.
When in air-conditioning unlatching situation, during P >=H, dutyfactor value is constant.
The dutycycle that described PWM control module exports to fan electromotor is,
When the dutycycle exported is at 0-7%, when not comprising 7% herein, fan keeps previous state full-speed operation after 10 seconds;
When the dutycycle inputted is between 7%-13%, fan does not operate;
When the dutycycle inputted increases gradually between 13-86%, do not comprise 13% and 86% herein, fan work electric current also increases gradually;
When the dutycycle inputted is greater than 86%, fan keeps previous state full-speed operation after 10 seconds.
When described fan does not work, the typical duty cycle ratio that PWM control module exports is 10%.
Although illustrate and describe embodiments of the invention, for the ordinary skill in the art, be appreciated that and can carry out multiple change, amendment, replacement and modification to these embodiments without departing from the principles and spirit of the present invention, scope of the present invention is by claims and equivalency thereof.
Claims (6)
1. a stepless speed regulation radiator fan controlling method, is characterized in that: the steps include:
The pressure signal that the demand signal that switch sends, pressure transducer send and the water temperature signal that engine water temperature sensor sends input 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 being calculated by above-mentioned signal, 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;
After PWM control module receives and comes from command signal that ECU sends, by calculate input signal dutycycle and according to communications protocol, export corresponding dutycycle to control each MOSFET field effect transistor, thus export different power and give different fan electromotors;
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;
Described ECU module transfer is achieved in the following ways to the signal of PWM control module:
When air-conditioning is closed, ECU module transfer is to PWM control module according to the different water temperature dutycycle input PWM command signals in the shutdown signal situation in switching signal to the PWM command signal of PWM control module; Meanwhile, ECU module is arranged with the logical signal postponing unlatching according to water temperature respectively in the middle speed of a motor vehicle or the high speed of a motor vehicle;
When air-conditioning is opened, ECU module transfer judges pressure and the speed of a motor vehicle of air-conditioning system to the signal demand of PWM control module, under different pressure ranges and vehicle speed intervals are according to different water temperature accordingly duty cycle transmissions signal to PWM control module.
2. stepless speed regulation radiator fan controlling method according to claim 1, is characterized in that: it is carry out in such a way that the water temperature dutycycle in described air-conditioning closedown situation exports:
During X1≤X < X2, Y=A+K1 (X-X1)
During 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, A be water temperature lower than initial dutycycle threshold values when 90 DEG C, Kn is the coefficient after the n-th threshold values, in this application Kn >=0, and X is actual water temperature, and Xn is the water temperature of the n-th threshold values, and n is natural number in this application.
3. stepless speed regulation radiator fan controlling method according to claim 1, is characterized in that: situation when described air-conditioning is opened is, exporting in the water temperature dutycycle of same pressure range is carry out in such a way:
During X1≤X < X2, Y=A+K1 (X-X1)
During 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, A be water temperature lower than initial dutycycle threshold values when 90 DEG C, Kn is the coefficient after the n-th threshold values, in this application Kn >=0, and X is actual water temperature, and Xn is the water temperature of the n-th threshold values, and 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 the value of L to be the value of 1400KPa, M be 1950KPa, 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 m/h-80 thousand ms/h; Described high speed is for being greater than 80,000 ms/h.
4. stepless speed regulation radiator fan controlling method according to claim 1, is characterized in that: the dutycycle that described PWM control module exports to fan electromotor is,
When the dutycycle exported is at 0-7%, fan keeps previous state full-speed operation after 10 seconds;
When the dutycycle inputted is between 7%-13%, fan does not operate;
When the dutycycle inputted increases gradually between 13-86%, fan work electric current also increases gradually;
When the dutycycle inputted is greater than 86%, fan keeps previous state full-speed operation after 10 seconds.
5. stepless speed regulation radiator fan controlling method according to claim 4, is characterized in that: when described fan does not work, and the typical duty cycle ratio that PWM control module exports is 10%.
6. the stepless speed regulation radiator fan controlling method according to claim 1 or 4 or 5, is characterized in that: described PWM control module output duty cycle signal is square wave electrical signal.
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Address after: 230601 Anhui Province, Hefei City Industrial Park, the Peach Blossom Road No. 669 Patentee after: Anhui Jianghuai Automobile Group Limited by Share Ltd Address before: 230601 Anhui Province, Hefei City Industrial Park, the Peach Blossom Road No. 669 Patentee before: Anhui Jianghuai Automotive Co., Ltd. |