CN103758622A - Control method and control system of engine cooling fan - Google Patents
Control method and control system of engine cooling fan Download PDFInfo
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- CN103758622A CN103758622A CN201410007008.0A CN201410007008A CN103758622A CN 103758622 A CN103758622 A CN 103758622A CN 201410007008 A CN201410007008 A CN 201410007008A CN 103758622 A CN103758622 A CN 103758622A
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Abstract
The invention discloses a control method and a control system of an engine cooling fan. The control method includes the following steps: acquiring engine operational parameters, vehicle speed and environmental temperature; judging whether or not a vehicle slides downhill or slides at a high speed by a long distance according to the acquired parameters; if yes, driving the cooling fan to operate at a high gear through inertia-caused kinetic energy of the vehicle, and if not, acquiring on-off state of an vehicle air conditioner; if the air conditioner is on, driving the cooling fan to operate at a high gear by combustion of an engine; and if the air conditioner is off, acquiring a corresponding gear of the cooling fan according to engine coolant temperature in the engine operational parameters, and driving the cooling fan to operate at the corresponding gear by the combustion of the engine. According to the control method, the inertia-caused kinetic energy, generated when the engine does not work, of the vehicle is provided to the cooling fan, the temperature of coolant in a radiator is reduced, time for starting of the cooling fan driven by the combustion of the engine after major cycle restarting is shortened, and power consumption of a cooling system is saved.
Description
Technical field
The present invention relates to technical field of engines, relate in particular to a kind of controlling method and control system of cooling fan of engine.
Background technique
Fig. 1 is the structural representation of engine-cooling system in prior art, as shown in Figure 1, motor 4 ' cooling system comprise water tank, water pump, thermostat 2 ', radiator 1 ', cooling fan 6 ', short circle pipeline 5 ', major cycle pipeline 7 ' and cooling liquid.
After motor 4 ' unlatching, gradually heat up, but the temperature of cooling liquid also do not reach thermostat 2 ' open temp time, cooling liquid only the water jacket 3 of motor 4 ' inner each several part ' in circulate, carry out short circle.When short circle pipeline 5 ' cooling liquid continue raise, reach thermostat 2 ' open temp (for example 75 ℃) time, thermostat 2 ' unlatching, short circle pipeline 5 ' sealed, lead to radiator 1 ' pipeline open, motor 4 ' interior cooling liquid flow through radiator 1 ', flow back to again motor 4 ', carry out major cycle.Through heat exchange after a while, motor 4 ' interior coolant temperature reaches consistent with radiator 1 ' coolant temperature.Along with the heating of motor 4 ' continuation, heat up, the coolant temperature in major cycle pipeline raises gradually, reach cooling fan 6 ' open temp (for example 85 ℃) time, cooling fan 6 ' unlatching, utilizes himself rotating speed to help radiator 1 ' heat radiation.The effect of water pump is to cooling liquid pressurization, guarantees that it circulates in each pipeline of cooling system.
Radiation fan 6 ' by clutch and motor 4 ' be connected, and be installed on radiator 1 ' near, in prior art, radiation fan 6 ' driving force all by engine combustion fuel, provided: the belt pulley that engine crankshaft passes to by belt, the wheel hub of belt pulley and radiation fan 6 ' main shaft between clutch is set, this clutch can be controlled radiation fan 6 ' rotate under free state, slowly runs, high speed rotating.
In concrete control procedure, as shown in Figure 2, this figure is the controlling method FB(flow block) of cooling fan in prior art, briefly introduces the defect of this controlling method and existence thereof below.
S11 ': the on off state that obtains air conditioner refrigerating;
S12 ': judge the on off state of air conditioner refrigerating, if open,
S13 ': utilize engine combustion acting to drive cooling fan to enter high-grade operation, if close,
S14 ': detect engine coolant temperature;
S15 ': obtain the respective notch of engine coolant temperature, utilize engine combustion acting to drive described cooling fan to enter respective notch operation.
Adopt above-mentioned controlling method, cooling fan can be opened corresponding gear when motor 4 ' temperature is higher, to radiator 1 ' dispel the heat, realize its fundamental function, but consumed power is more.The reasons are as follows:
When Vehicle Driving Cycle is at descending road or at a high speed long during apart from sliding state, motor 4 ' do not do work, therefore motor 4 ' interior coolant temperature can drop to the temperature (85 ℃) that fan cuts out very soon, and cooling fan stops operating.Motor 4 ' interior coolant temperature is further reduced to thermostat 2 ' closing temperature (75 ℃), thermostat 2 ' close, and major cycle pipeline is closed, and motor 4 ' cooling liquid is carried out short circle.
But cooling fan is after cutting out, radiator 1 ' interior coolant temperature declines slower.When the output torque of motor 4 ' again, motor 4 ' interior coolant temperature will soon rise, and cooling fan 6 ' need is again opened, motor 4 ' need to provide cooling fan 4 ' driving force, the power that causes cooling fan to consume is more, and complete-vehicle oil consumption is more.
In view of this, urgently for above-mentioned technical problem, the controlling method of cooling fan of the prior art is optimized to design, to reduce the consumed power of cooling system, saves complete-vehicle oil consumption.
Summary of the invention
Object of the present invention is for providing a kind of controlling method and control system of cooling fan of engine, utilize downhill running or the high-grade operation of the long energy drives cooling fan apart from sliding generation at a high speed, to reduce the coolant temperature in radiator, make motor again longer to the time of opening cooling fan after output power, thereby saved the energy consumption of system.
For solving the problems of the technologies described above, the invention provides a kind of controlling method of cooling fan of engine, comprise the steps:
Obtain engine operating parameter, the car load speed of a motor vehicle and ambient temperature;
According to the parameter of obtaining judge car load whether downhill running or at a high speed long distance slide, if so, utilize the kinetic energy that car load inertia produces to drive the high-grade operation of cooling fan, if not,
Obtain the on off state of the air conditioner refrigerating of vehicle, if open, utilize engine combustion acting to drive cooling fan to enter high-grade operation, if close,
According to the engine coolant temperature in engine operating parameter, obtain the gear that cooling fan is corresponding, utilize engine combustion acting to drive described cooling fan to enter corresponding gear operation.
Preferably, described engine operating parameter comprises engine speed, gas pedal stroke and engine coolant temperature.
Preferably, judge vehicle downhill running according to being:
The car load speed of a motor vehicle in default more than the car load speed of a motor vehicle and within a predetermined period of time cumulative, engine speed more than default engine speed, gas pedal stroke be less than default stroke, ambient temperature more than default ambient temperature and engine coolant temperature more than default coolant temperature.
Preferably, judge that the long distance of vehicle high-speed slides according to being:
The car load speed of a motor vehicle in default more than the car load speed of a motor vehicle, engine speed more than default engine speed, gas pedal stroke be less than default stroke, ambient temperature more than default ambient temperature and engine coolant temperature more than default coolant temperature.
The present invention also provides a kind of controlling method of cooling fan of engine, comprises the steps:
Obtain engine operating parameter, the highway gradient, direction and ambient temperature;
According to the parameter of obtaining, judge whether downhill running of car load, if so,
Utilize the kinetic energy that car load inertia produces to drive the high-grade operation of cooling fan, if not,
Obtain the on off state of the air conditioner refrigerating of vehicle, if open, utilize engine combustion acting to drive cooling fan to enter high-grade operation, if close,
According to the engine coolant temperature in engine operating parameter, obtain the gear that cooling fan is corresponding, utilize engine combustion acting to drive described cooling fan to enter corresponding gear operation.
Preferably, judge vehicle downhill running according to being:
The described highway gradient, direction be descending and the gradient more than the default gradient, ambient temperature more than default ambient temperature and described engine coolant temperature more than default coolant temperature.
Adopt above-mentioned controlling method, when vehicle downhill running or when at a high speed long distance slides, vehicle wheel rotational speed is higher, not oil spout of motor, motor drags under effect rotating speed higher car load counter, now by clutch combination between cooling fan and motor, so that the high-grade operation of driven by engine cooling fan can be accelerated the heat exchange of radiator coolant, further reduce radiator coolant temperature.Therefore, when downhill running or long apart from sliding end at a high speed, when motor commencement of fuel injection, output power, engine coolant temperature rises, and opens thermostat, starts major cycle, because the temperature of radiator coolant is lower, carry out heat exchange with engine coolant, until it is longer to reach the needed time of cooling fan open temp, the time that the energy that therefore burning of cooling fan consumption of engine produces is opened is more late.As can be seen here, the kinetic energy that the method produces rotation of wheel under motor does not do work prerequisite offers cooling fan, reduces the energy that cooling fan consumes, the power consumpiton of greatly having saved cooling system.
The present invention also provides a kind of control system of cooling fan of engine, comprising:
The first detection device, obtains engine operating parameter, the car load speed of a motor vehicle and ambient temperature;
The first controller, be connected with detection device, according to the parameter of obtaining judge car load whether downhill running or at a high speed long distance slide, if send, utilize the kinetic energy that car load inertia produces to drive first of the high-grade operation of cooling fan to order, send if not the second order of the on off state of the air conditioner refrigerating that obtains vehicle, and when opening, send and utilize engine combustion acting to drive cooling fan to enter the 3rd order of high-grade operation, when closing, send and utilize engine combustion acting to drive described cooling fan according to the 4th order of the gear operation corresponding with engine cooling temperature,
The first actuating device, is connected with controller, for receiving the control command of controller and exporting cooling fan to.
Preferably, described the first controller judge vehicle downhill running according to being:
The car load speed of a motor vehicle in default more than the car load speed of a motor vehicle and within a predetermined period of time cumulative, engine speed more than default engine speed, gas pedal stroke be less than default stroke, ambient temperature more than default ambient temperature and engine coolant temperature more than default coolant temperature;
The long distance of vehicle high-speed that judges described the first controller slide according to being:
The car load speed of a motor vehicle in default more than the car load speed of a motor vehicle, engine speed more than default engine speed, gas pedal stroke be less than default stroke, ambient temperature more than default ambient temperature and engine coolant temperature more than default coolant temperature.
The present invention also provides a kind of control system of cooling fan of engine, comprising:
Second detection device, obtains engine operating parameter, the highway gradient, direction and ambient temperature;
Second controller, according to the parameter of obtaining, judge whether downhill running of car load, if send, utilize the kinetic energy that car load inertia produces to drive first of the high-grade operation of cooling fan to order, send if not the second order of the on off state of the air conditioner refrigerating that obtains vehicle, and when opening, send and utilize engine combustion acting to drive the 3rd order of the high-grade operation of cooling fan, when closing, send and utilize engine combustion acting to drive cooling fan to enter the 4th order of the gear operation corresponding with engine cooling temperature;
The second actuating device, is connected with controller, for receiving the control command of controller and exporting cooling fan to.
Preferably, described second controller judge vehicle downhill running according to being:
The described highway gradient, direction be descending and the gradient more than the default gradient, ambient temperature more than default ambient temperature and described engine coolant temperature more than default coolant temperature.
Because above-mentioned controlling method has as above technique effect, therefore, the control system corresponding with this controlling method also should have identical technique effect, do not repeat them here.
Accompanying drawing explanation
Fig. 1 is the structural representation of engine-cooling system in prior art;
Fig. 2 is the controlling method FB(flow block) of cooling fan in prior art;
Fig. 3 is the FB(flow block) of a kind of embodiment of controlling method provided by the present invention;
Fig. 4 is the FB(flow block) of the another kind of embodiment of controlling method provided by the present invention;
Fig. 5 is the structured flowchart of a kind of embodiment of control system provided by the present invention;
Fig. 6 is the structured flowchart of the another kind of embodiment of control system provided by the present invention.
Wherein, in Fig. 1:
Radiator 1 '; Thermostat 2 '; Water jacket 3 '; Motor 4 '; Short circle pipeline 5 '; Cooling fan 6 '; Major cycle pipeline 7 ';
In Fig. 5, Fig. 6:
The first detection device 11; The first controller 12; The first actuating device 13;
Embodiment
Core of the present invention is for a kind of controlling method and control system of cooling fan of engine are provided, and by the energy that utilizes downhill running or produce when long distance slides at a high speed, reduces coolant temperature in radiator, saves the energy consumption of entire system.
In order to make those skilled in the art understand better technological scheme of the present invention, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Please refer to Fig. 3, the FB(flow block) of a kind of embodiment that Fig. 3 is controlling method provided by the present invention.
In a kind of embodiment, as shown in Figure 3, the invention provides a kind of controlling method of cooling fan of engine, comprise the steps:
S11: obtain engine operating parameter, the car load speed of a motor vehicle and ambient temperature;
Wherein, engine operating parameter can specifically comprise engine speed, gas pedal stroke and engine coolant temperature.Certainly, engine operating parameter is not limit yet and is comprised this three parameters, can also be other parameters.
Specifically can detect parameters by multiple sensors are set, for example, with the first rotating coder, measure engine speed, the second rotating coder is measured the car load speed of a motor vehicle, and displacement sensor gas pedal stroke, temperature transducer detect engine cooling temperature.
S12: according to the parameter of obtaining judge car load whether downhill running or at a high speed long distance slide, if so, perform step S13; If not, execution step S14;
S13: the kinetic energy that utilizes car load inertia to produce drives the high-grade operation of described cooling fan;
When vehicle downhill running or when at a high speed long distance slides, higher and the not oil spout of motor of wheel rotating speed under effect of inertia, motor drags under effect rotating speed higher car load counter, now by clutch combination between cooling fan and motor, so that the high-grade operation of driven by engine cooling fan, can accelerate the heat exchange of radiator coolant, further reduce radiator coolant temperature.
S14: the on off state that obtains the air conditioner refrigerating of vehicle;
S15: judge whether air conditioner refrigerating is opened, if open, execution step S16; If close, execution step S17;
S16: utilize engine combustion acting to drive cooling fan to enter high-grade operation;
S17: obtain according to the engine coolant temperature in engine operating parameter the gear that cooling fan is corresponding, utilize engine combustion acting to drive described cooling fan to enter corresponding gear operation.
Step S14～S17 is outside above-mentioned two situations in the situation that, according to the operation of method control cooling fan same as the prior art, does not repeat them here.
Adopt above-mentioned controlling method, when downhill running or long apart from sliding end at a high speed, when motor commencement of fuel injection, output power, engine coolant temperature rises, and opens thermostat, starts major cycle, because the temperature of radiator coolant is lower, carry out heat exchange with engine coolant, until it is longer to reach the needed time of cooling fan open temp, the time that therefore cooling fan utilizes motor acting to open is more late.As can be seen here, the kinetic energy that the method produces rotation of wheel under motor does not do work prerequisite offers cooling fan, reduces the oil consumption of motor.
In concrete scheme, in above-mentioned controlling method, judge vehicle downhill running according to being: the car load speed of a motor vehicle in default more than the car load speed of a motor vehicle and within a predetermined period of time cumulative, engine speed more than default engine speed, gas pedal stroke be less than default stroke, ambient temperature more than default ambient temperature and engine coolant temperature more than default coolant temperature.
Adopt this basis for estimation, can judge quickly and accurately whether downhill running of vehicle.Wherein, the car load speed of a motor vehicle be greater than predefined value and Preset Time section exist on the occasion of acceleration, motor be greater than predefined value, gas pedal stroke be less than predefined value show motor without fuel feeding High Rotation Speed, thereby be defined as downhill running.In the too low situation of ambient temperature, cooling fan, without unlatching, therefore needs to limit ambient temperature more than preset temperature.In addition, engine coolant temperature represents motor operation a period of time higher than certain value, if working time is too short, coolant temperature is lower, major cycle is not opened, and does not need to open cooling fan yet.
In another kind of concrete scheme, in above-mentioned controlling method, judge that the long distance of vehicle high-speed slides according to being: the car load speed of a motor vehicle in default more than the car load speed of a motor vehicle, engine speed more than default engine speed, gas pedal stroke be less than default stroke, ambient temperature more than default ambient temperature and engine coolant temperature more than default coolant temperature.
Adopt this basis for estimation, can judge quickly and accurately whether downhill running of vehicle.Wherein, the car load speed of a motor vehicle be greater than predefined value, motor be greater than predefined value, gas pedal stroke be less than predefined value show motor without fuel feeding High Rotation Speed, thereby be defined as long distance at a high speed, slide.
It should be noted that, " long distance slides at a high speed " is for summarizing concept, refer to that vehicle stops to motor oil spout when high speed operation, the situation of appointing vehicle to slide forward under its effect of inertia, for example, driver sees that when the speed of a motor vehicle is 90km/h there is red light in front, unclamp immediately after throttle, vehicle carries out the long distance of high speed and slides, and speed is more and more less, until stop.For different vehicles and motor, can will " the long distance at a high speed " that be suitable for himself be specifically set.
In addition, as shown in Figure 4, the structural representation of the another kind of embodiment that Fig. 4 is controlling method provided by the present invention, the present invention also provides a kind of controlling method of cooling fan of engine, comprises the steps:
S21: obtain engine operating parameter, the highway gradient, direction and ambient temperature;
S22: judge whether downhill running of car load according to the parameter of obtaining, if so, perform step S23; If not, execution step S24;
S23: utilize the kinetic energy that car load inertia produces to drive the high-grade operation of cooling fan;
S24: the on off state that obtains the air conditioner refrigerating of vehicle;
S25: judge whether air conditioner refrigerating is opened, if open, execution step S26; If close, execution step S27;
S26: utilize engine combustion acting to drive cooling fan to enter high-grade operation;
S27: obtain according to the engine coolant temperature in engine operating parameter the gear that cooling fan is corresponding, utilize engine combustion acting to drive described cooling fan to enter corresponding gear operation.
Adopt in this way, identical with the design of above-mentioned mode of execution, according to engine operating parameter, the highway gradient, direction and ambient temperature, judge whether whether downhill running of vehicle, and the energy that utilizes wheel High Rotation Speed to produce when downhill running, drive the high-grade operation of cooling fan, further reduce the temperature of radiator coolant, so that the opening time that cooling fan utilizes engine combustion acting to drive is shorter, save the energy consumption of system.
Particularly, in above-mentioned controlling method, judge vehicle high-speed downhill running according to being: the described highway gradient, direction be descending and the gradient more than the default gradient, ambient temperature more than default ambient temperature and described engine coolant temperature more than default coolant temperature.
Adopt in this way, can judge simply, accurately and quickly equally whether downhill running of vehicle.Wherein, can measure highway height above sea level and distance by GPS, and then calculate and obtain the gradient, this surveying is prior art, does not repeat them here.
Please refer to Fig. 5, the structured flowchart of a kind of embodiment that Fig. 5 is control system provided by the present invention.
In a kind of embodiment, as shown in Figure 5, the present invention also provides a kind of control system of cooling fan of engine, comprising:
The first detection device 11, obtains engine operating parameter, the car load speed of a motor vehicle and ambient temperature;
The first controller 12, be connected with the first detection device 11, according to the parameter of obtaining judge car load whether downhill running or at a high speed long distance slide, if send, utilize the kinetic energy that car load inertia produces to drive first of the high-grade operation of cooling fan to order, send if not the second order of the on off state of the air conditioner refrigerating that obtains vehicle, and when opening, send and utilize engine combustion acting to drive cooling fan to enter the 3rd order of high-grade operation, when closing, send and utilize engine combustion acting to drive cooling fan according to the 4th order of the gear operation corresponding with engine cooling temperature,
The first actuating device 13, is connected with the first controller 12, for receiving its control command and exporting cooling fan to.
In concrete scheme, described the first controller 12 judge vehicle downhill running according to being: the car load speed of a motor vehicle in default more than the car load speed of a motor vehicle and within a predetermined period of time cumulative, engine speed more than default engine speed, gas pedal stroke be less than default stroke, ambient temperature more than default ambient temperature and engine coolant temperature more than default coolant temperature.
The long distance of vehicle high-speed that judges the first controller 12 slide according to being: the car load speed of a motor vehicle in default more than the car load speed of a motor vehicle, engine speed more than default engine speed, gas pedal stroke be less than default stroke, ambient temperature more than default ambient temperature and engine coolant temperature more than default coolant temperature.
In addition, as shown in Figure 6, the present invention also provides a kind of control system of cooling fan of engine, comprising:
The second actuating device 23, is connected with second controller 22, for receiving its control command and exporting cooling fan to.
In concrete scheme, described second controller 22 judge vehicle downhill running according to being:
The described highway gradient, direction be descending and the gradient more than the default gradient, ambient temperature more than default ambient temperature and described engine coolant temperature more than default coolant temperature.
Because the controlling method of above-mentioned cooling fan has as above technique effect, therefore, the control system corresponding with this controlling method also should have identical technique effect, do not repeat them here.
Controlling method to a kind of cooling fan of engine provided by the present invention and control system are described in detail above.Applied specific case herein principle of the present invention and mode of execution are set forth, above embodiment's explanation is just for helping to understand method of the present invention and core concept thereof.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of the claims in the present invention.
Claims (10)
1. a controlling method for cooling fan of engine, is characterized in that, comprises the steps:
Obtain engine operating parameter, the car load speed of a motor vehicle and ambient temperature;
According to the parameter of obtaining judge car load whether downhill running or at a high speed long distance slide, if so, utilize the kinetic energy that car load inertia produces to drive the high-grade operation of cooling fan, if not,
Obtain the on off state of the air conditioner refrigerating of vehicle, if open, utilize engine combustion acting to drive cooling fan to enter high-grade operation, if close,
According to the engine coolant temperature in engine operating parameter, obtain the gear that cooling fan is corresponding, utilize engine combustion acting to drive described cooling fan to enter corresponding gear operation.
2. the controlling method of cooling fan of engine according to claim 1, is characterized in that, described engine operating parameter comprises engine speed, gas pedal stroke and engine coolant temperature.
3. the controlling method of cooling fan of engine according to claim 2, is characterized in that, judge vehicle downhill running according to being:
The car load speed of a motor vehicle in default more than the car load speed of a motor vehicle and within a predetermined period of time cumulative, engine speed more than default engine speed, gas pedal stroke be less than default stroke, ambient temperature more than default ambient temperature and engine coolant temperature more than default coolant temperature.
4. the controlling method of cooling fan of engine according to claim 2, is characterized in that, judge that the long distance of vehicle high-speed slides according to being:
The car load speed of a motor vehicle in default more than the car load speed of a motor vehicle, engine speed more than default engine speed, gas pedal stroke be less than default stroke, ambient temperature more than default ambient temperature and engine coolant temperature more than default coolant temperature.
5. a controlling method for cooling fan of engine, is characterized in that, comprises the steps:
Obtain engine operating parameter, the highway gradient, direction and ambient temperature;
According to the parameter of obtaining, judge whether downhill running of car load, if so,
Utilize the kinetic energy that car load inertia produces to drive the high-grade operation of cooling fan, if not,
Obtain the on off state of the air conditioner refrigerating of vehicle, if open, utilize engine combustion acting to drive cooling fan to enter high-grade operation, if close,
According to the engine coolant temperature in engine operating parameter, obtain the gear that cooling fan is corresponding, utilize engine combustion acting to drive described cooling fan to enter corresponding gear operation.
6. the controlling method of cooling fan of engine according to claim 5, is characterized in that, judge vehicle downhill running according to being:
The described highway gradient, direction be descending and the gradient more than the default gradient, ambient temperature more than default ambient temperature and described engine coolant temperature more than default coolant temperature.
7. a control system for cooling fan of engine, is characterized in that, comprising:
The first detection device (11), obtains engine operating parameter, the car load speed of a motor vehicle and ambient temperature;
The first controller (12), be connected with the first detection device (11), according to the parameter of obtaining judge car load whether downhill running or at a high speed long distance slide, if send, utilize the kinetic energy that car load inertia produces to drive first of the high-grade operation of cooling fan to order, send if not the second order of the on off state of the air conditioner refrigerating that obtains vehicle, and when opening, send and utilize engine combustion acting to drive cooling fan to enter the 3rd order of high-grade operation, when closing, send and utilize engine combustion acting to drive described cooling fan according to the 4th order of the gear operation corresponding with engine cooling temperature in engine operating parameter,
The first actuating device (13), is connected with the first controller (12), for receiving its order and exporting cooling fan to.
8. the controlling method of cooling fan of engine according to claim 7, is characterized in that, described the first controller (12) judge vehicle downhill running according to being:
The car load speed of a motor vehicle in default more than the car load speed of a motor vehicle and within a predetermined period of time cumulative, engine speed more than default engine speed, gas pedal stroke be less than default stroke, ambient temperature more than default ambient temperature and engine coolant temperature more than default coolant temperature;
The long distance of vehicle high-speed that judges described the first controller slide according to being:
The car load speed of a motor vehicle in default more than the car load speed of a motor vehicle, engine speed more than default engine speed, gas pedal stroke be less than default stroke, ambient temperature more than default ambient temperature and engine coolant temperature more than default coolant temperature.
9. a control system for cooling fan of engine, is characterized in that, comprising:
Second detection device (21), obtains engine operating parameter, the highway gradient, direction and ambient temperature;
Second controller (22), be connected with second detection device (21), according to the parameter of obtaining, judge whether downhill running of car load, if send, utilize the kinetic energy that car load inertia produces to drive first of the high-grade operation of cooling fan to order, send if not the second order of the on off state of the air conditioner refrigerating that obtains vehicle, and when opening, send and utilize engine combustion acting to drive the 3rd order of the high-grade operation of cooling fan, when closing, send and utilize engine combustion acting to drive cooling fan to enter the 4th order of the gear operation corresponding with engine cooling temperature in engine operating parameter,
The second actuating device (23), is connected with second controller (22), for receiving its order and exporting cooling fan to.
10. the controlling method of cooling fan of engine according to claim 9, is characterized in that, described second controller (22) judge vehicle downhill running according to being:
The described highway gradient, direction be descending and the gradient more than the default gradient, ambient temperature more than default ambient temperature and described engine coolant temperature more than default coolant temperature.
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