JPH11294162A - Rotational speed control device for cooling fan - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress increase of a rotational speed of a cooling fan and improve quietness of an automobile mounting a continuous transmission. SOLUTION: An engine speed comparator 5 determines a degree Hi/Lo of an engine speed ER. A fan rotational speed determination part 6 selects a proper value among fan rotational speed characteristics data. Based on the selected fan rotational speed characteristic data, rotational speed R of a cooling fan 7 corresponding to a cooling water temperature H is determined. A fan rotational speed controller 8 controls rotational speed of the cooling fan 7 so as to agree with the determined rotational number R. The rotational speed of the cooling fan 7 is suppressed low with the possibly high cooling water temperature within the range that the engine is not damaged, while selecting the fan rotational speed characteristic data in the case that the engine speed is low. The cooling fan is thus quietness operated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling fan rotation speed control device for a vehicle equipped with a continuously variable transmission.

[0002]

2. Description of the Related Art In recent years, vehicles equipped with a continuously variable transmission have been put to practical use. In addition, there are vehicles which use a continuously variable transmission as a high-performance vehicle and which can switch between an automatic transmission mode and a manual transmission mode. Are known.

On the other hand, a cooling fan rotation speed control device that monitors the temperature of cooling water for cooling an engine and controls the rotation speed of a cooling fan of a radiator according to the level of the cooling water has been widely used.

In such a conventional cooling fan rotation speed control device, the engine rotation speed is low while the cooling water temperature H is low, based on a cooling water temperature-cooling fan rotation speed characteristic curve as shown in FIG. In addition, the control is performed such that the rotational speed R of the cooling fan is also lowered, and the rotational speed of the cooling fan is increased as the engine rotational speed R increases and the cooling water temperature H increases accordingly.

[0005]

However, when such a conventional cooling fan speed control device is applied to a vehicle equipped with a continuously variable transmission, there are the following problems. In a vehicle equipped with a normal transmission, the gear ratio is fixed for each gear, so during acceleration, the engine speed generally increases in proportion to the increase in vehicle speed. Accordingly, the cooling water temperature rises, and the rotation speed of the cooling fan rises with the rise of the cooling water temperature.However, since the rotation speed of the engine that emits loud noise itself is rising, the rotation noise of the cooling fan increases. It is difficult for vehicle occupants to hear noise. However, in vehicles equipped with a continuously variable transmission, control is first performed to adjust the transmission so that the gear ratio is such that an optimum torque can be obtained for acceleration operation, and if the torque is insufficient, control is performed to increase the engine speed. Even during acceleration, the increase in engine speed is small,
When the rotation speed of the cooling fan is increased with the characteristic as shown in FIG. 8 of the related art, the rotation speed of the cooling fan increases even when the vehicle speed increases without increasing the engine rotation speed, and the rotation noise of the cooling fan is reduced. There was a problem that a driver and a passenger could hear the noise.

The present invention has been made in view of such a conventional problem. In a vehicle equipped with a continuously variable transmission, cooling water is required until the engine speed exceeds a level at which occupants can hear noise to some extent. Even if the temperature rises, keep the cooling fan speed as low as possible, and if the engine speed exceeds a certain level, increase the cooling fan speed in accordance with the rise in cooling water temperature. It is another object of the present invention to provide a cooling fan rotation speed control device capable of quietly controlling the cooling fan without impairing the engine cooling performance.

[0007]

According to the present invention, there is provided an apparatus for controlling the number of revolutions of a cooling fan in a vehicle having a continuously variable transmission having an automatic transmission mode in which the transmission ratio of the vehicle is automatically changed in a stepless manner. There is an engine speed detecting means for detecting an engine speed, a cooling water temperature detecting means for detecting a cooling water temperature, a cooling fan for blowing air to a radiator, and a relationship between the cooling water temperature and the number of rotations of the cooling fan. A plurality of fan speed characteristic data are provided corresponding to the engine load, an engine load is determined based on the engine speed detected by the engine speed detecting means, and one is selected from the plurality of fan speed characteristic data. Fan speed characteristic data selecting means to perform the cooling water temperature based on the fan speed characteristic data selected by the fan speed characteristic data selecting means. A fan rotation speed determining unit that determines the rotation speed of the cooling fan from the cooling water temperature detected by the detection unit, and a rotation speed determined by the fan rotation speed determination unit and a rotation speed of the cooling fan. And fan speed control means for controlling the cooling fan.

[0008] In the cooling fan rotation speed control device according to the first aspect of the invention, the fan rotation speed characteristic data selecting means selects an appropriate one of the plurality of fan rotation speed characteristic data in accordance with the engine load. The fan rotation speed determining means determines the rotation speed of the cooling fan corresponding to the cooling water temperature based on the selected fan rotation speed characteristic data, and controls the fan rotation speed control means to match the determined rotation speed. Controls the rotation speed of the cooling fan.

With this configuration, it is possible to use fan rotation speed characteristic data which should be selected to be as low as possible when the engine load is low, so that the rotation speed of the cooling fan is reduced to the highest possible cooling water temperature without damaging the engine. In a vehicle equipped with a continuously variable transmission, it is possible to suppress a phenomenon in which only the rotation speed of the cooling fan increases in a state where the engine is accelerated while the engine rotation sound is low, and the quiet operation control of the cooling fan becomes possible.

According to a second aspect of the present invention, there is provided a vehicle provided with a continuously variable transmission having an automatic transmission mode in which the transmission ratio of the vehicle is automatically changed in a stepless manner and a manual transmission mode in which an occupant manually changes the transmission ratio. A speed control device for a cooling fan, a shift mode determining means for determining whether a current shift mode is an automatic shift mode or a manual shift mode, a cooling water temperature detecting means for detecting a cooling water temperature, and blowing air to a radiator. A plurality of cooling fans, and a plurality of fan rotation speed characteristic data in which a cooling water temperature and a rotation speed of the cooling fan are associated with each other in the automatic shift mode and the manual shift mode, respectively, are determined by the shift mode determining unit. Fan speed characteristic data selecting means for selecting the fan speed characteristic data corresponding to the shifted gear mode, and fan speed characteristic data selecting means. A fan rotation speed determining unit that determines the rotation speed of the cooling fan from the cooling water temperature detected by the cooling water temperature detection unit based on the selected fan rotation speed characteristic data; Fan rotation speed control means for controlling the cooling fan so that the rotation speed thus set matches the rotation speed of the cooling fan.

In the cooling fan rotation speed control device according to the second aspect of the present invention, the fan rotation speed characteristic data selection unit determines the fan rotation speed according to the automatic shift mode and the manual shift mode based on the determination by the shift mode determination unit. Number characteristic data is selected, and the fan rotation number determining means determines the rotation number of the cooling fan corresponding to the cooling water temperature based on the selected fan rotation number characteristic data, and matches the determined rotation number. Thus, the fan rotation speed control means controls the rotation speed of the cooling fan.

[0012] This makes it possible to switch the fan speed characteristic data to be referred to depending on whether the shift mode is the automatic mode or the manual mode. In particular, the fan speed characteristic data for the automatic shift mode can be switched within a range that does not damage the engine. If you use a cooling fan that keeps the rotation speed of the cooling fan low to the highest possible cooling water temperature, you can cool the vehicle equipped with a continuously variable transmission while accelerating while the engine rotation sound is low during operation in the automatic transmission mode. The phenomenon that only the rotation speed of the fan increases can be suppressed, and the quiet operation control of the cooling fan can be performed.

According to a third aspect of the present invention, there is provided a vehicle equipped with a continuously variable transmission having an automatic transmission mode in which the transmission ratio of the vehicle is automatically changed in a stepless manner and a manual transmission mode in which an occupant manually changes the transmission ratio. A speed control device for a cooling fan, a speed change mode determining means for determining whether a current speed mode is an automatic speed mode or a manual speed mode, an engine speed detecting means for detecting an engine speed, and a cooling water temperature. The cooling water temperature detecting means for detecting, the cooling fan for blowing air to the radiator, and the fan rotation speed characteristic data in which the cooling water temperature and the rotation speed of the cooling fan are associated with each other in the automatic shift mode and the manual shift mode, respectively. A plurality of engine loads corresponding to the engine load; determining an engine load based on the engine speed detected by the engine speed detecting means; Fan speed characteristic data selecting means for selecting the fan speed characteristic data corresponding to the shift mode determined by the mode determining means; and fan speed characteristic data selected by the fan speed characteristic data selecting means. A fan rotation speed determining means for determining a rotation speed of the cooling fan from the cooling water temperature detected by the cooling water temperature detection device; a rotation speed determined by the fan rotation speed determination device; and a rotation speed of the cooling fan. Fan speed control means for controlling the cooling fan so that the numbers match.

[0014] In the cooling fan rotation speed control device according to the third aspect of the present invention, in the automatic shift mode, the fan rotation speed characteristic data selection means selects an appropriate one of a plurality of fan rotation speed characteristic data according to the engine load. In the manual shift mode, the fan speed characteristic data selecting means selects fan speed characteristic data corresponding to the manual speed mode, and the fan speed determining means selects any one of these selected fan speeds. The rotation speed of the cooling fan corresponding to the cooling water temperature is determined based on the numerical characteristic data, and the fan rotation speed control means controls the rotation speed of the cooling fan so as to match the determined rotation speed.

According to this, it is possible to switch the fan speed characteristic data to be referred to depending on whether the shift mode is the automatic mode or the manual mode, and to switch the fan speed characteristic data in accordance with the engine load in the automatic shift mode. If the speed of the cooling fan is reduced to the highest possible cooling water temperature within the range that does not damage the engine as the fan speed characteristic data for the automatic transmission mode, it can be used in vehicles equipped with a continuously variable transmission. During the operation in the automatic transmission mode, it is possible to suppress a phenomenon that only the rotation speed of the cooling fan rises in a state where the engine is accelerated while the engine rotation sound is low, and the quiet operation control of the cooling fan becomes possible.

According to a fourth aspect of the present invention, in the cooling fan speed control device according to the first or third aspect, the fan speed characteristic data selecting means is provided when the engine speed exceeds a predetermined engine load in the automatic shift mode. Selecting first characteristic data for increasing the cooling fan rotation speed in a stepwise manner as the cooling water temperature increases, and when not exceeding the predetermined engine load, the cooling fan is substantially proportional to the cooling water temperature; The second characteristic data for continuously changing the rotation speed is selected, so that in a running state where the engine load is low, the cooling speed is as high as possible within a range that does not damage the engine as the fan rotation speed characteristic data. A cooling fan whose rotation speed is kept low to the water temperature can be used, and the quiet operation of the cooling fan can be controlled.

[0017]

As described above, according to the first aspect of the present invention,
An appropriate one is selected from a plurality of fan rotation speed characteristic data according to the engine load, and the rotation speed of the cooling fan corresponding to the cooling water temperature is determined based on the selected fan rotation speed characteristic data. Since the rotation speed of the cooling fan is controlled to match the determined rotation speed, the fan rotation speed characteristic data to be selected when the engine load is low is as high as possible as long as the cooling water temperature is within a range that does not damage the engine. By using a device that keeps the cooling fan speed low, it is possible to suppress the phenomenon that only the cooling fan speed rises in a vehicle equipped with a continuously variable transmission while the engine speed is low and the engine speed is low. It is possible to control the quiet operation of the cooling fan.

According to the second aspect of the present invention, one of a plurality of fan rotational speed characteristic data is selected according to the automatic shift mode or the manual shift mode, and based on the selected fan rotational speed characteristic data, The number of rotations of the cooling fan corresponding to the cooling water temperature is determined, and the number of rotations of the cooling fan is controlled so as to match the determined number of rotations. Therefore, reference is made according to whether the shift mode is the automatic mode or the manual mode. It is possible to switch the fan speed characteristic data, especially to use the fan speed characteristic data for the automatic transmission mode that suppresses the cooling fan speed to the highest possible cooling water temperature as long as the engine is not damaged. If the vehicle is equipped with a continuously variable transmission, the speed of the cooling fan will only increase when the vehicle is accelerating with low engine rotation while driving in automatic transmission mode. Phenomenon that can be suppressed, it is possible quiet operation control of the cooling fan.

According to the third aspect of the invention, an appropriate one is selected from a plurality of fan speed characteristic data according to the engine load in the automatic shift mode, and the manual shift mode is selected in the manual shift mode. The fan speed characteristic data is selected, and based on any one of the selected fan speed characteristic data, the rotation speed of the cooling fan corresponding to the cooling water temperature is determined, and the rotation speed coincides with the determined rotation speed. In this way, the fan speed control data is switched according to whether the shift mode is the automatic mode or the manual mode, and the fan speed characteristic data is switched according to the engine load in the automatic shift mode. Can be switched, especially as the fan speed characteristic data for automatic transmission mode up to the highest possible coolant temperature within the range that does not damage the engine By using a fan that keeps the cooling fan rotating at a low speed, if the vehicle is equipped with a continuously variable transmission, the speed of the cooling fan will only increase while the engine speed is low while operating in automatic transmission mode. The phenomenon of rising can be suppressed, and quiet operation control of the cooling fan is possible.

According to the fourth aspect of the present invention, in the automatic transmission mode, when the engine load exceeds a predetermined engine load, the first characteristic data for gradually increasing the number of rotations of the cooling fan as the temperature of the cooling water increases. When the engine load does not exceed the predetermined engine load, the second characteristic data for continuously changing the cooling fan speed substantially in proportion to the cooling water temperature is selected. As the fan speed characteristic data, it is possible to use a fan whose rotation speed is kept low to a cooling water temperature as high as possible without damaging the engine, so that quiet operation control of the cooling fan is possible.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing a functional configuration of a first embodiment of the present invention. A cooling fan rotation speed control device according to the first embodiment includes a vehicle speed sensor 1 for detecting a vehicle speed SP, an accelerator opening. Accelerator opening sensor 2 for detecting the temperature, cooling water temperature sensor 3 for detecting the temperature of the cooling water, a cooling water temperature sensor 3 as a cooling water temperature detecting means, a vehicle speed SP detected by the vehicle speed sensor 1 and an accelerator opening detected by the accelerator opening sensor. 2, an engine speed determination unit 4 that calculates an engine speed ER with reference to a shift schedule map M of the continuously variable transmission, and compares the engine speed ER with a predetermined reference value N1. The engine speed (Hi /
An engine speed comparison unit 5 as engine speed detection means for determining Lo) is provided.

The cooling fan rotation speed control device is also shown in FIG.
Are provided with two kinds of fan rotation speed characteristic data tables B-1 (for Lo) and B-2 (for Hi) as shown in FIG. Rotational speed characteristic data tables B-1, B-
2 and fan speed as fan speed characteristic data selection means and fan speed determination means for determining the rotation speed of the cooling fan based on the cooling water temperature H detected by the cooling water temperature sensor 3. A number-of-rotations determining unit 6; and a fan-rotation-speed control unit 8 as a fan-rotation-speed control unit that controls the rotation speed of the cooling fan 7 so as to match the fan rotation speed determined by the fan-rotation-speed determination unit 6. I have.

Next, the operation of the cooling fan rotation speed control device having the above configuration will be described. The engine speed determination unit 4 incorporates a shift schedule map M of the continuously variable transmission as shown in FIG. 2, and stores the vehicle speed SP detected by the vehicle speed sensor 1 and the accelerator opening detected by the accelerator opening sensor 2. , The engine speed ER is determined with reference to the shift schedule map M. For example, if the accelerator opening is 4/8, the shift schedule map M determines the engine speed ER according to the vehicle speed SP on the corresponding accelerator opening curve, and matches the engine speed. As described above.

The engine speed determining unit 4 passes the engine speed ER thus determined to the engine speed comparing unit 5.
In the engine speed comparison section 5, the engine speed ER is set to a reference value N1 (here, N1 = 3000 rpm).
Although this value is not particularly limited, it is desirable to set the highest rotational speed obtained in a normal driving condition on a normal road to the reference value N1, and it depends on the engine displacement, characteristics, vehicle weight, and driving method. Are different. In the first embodiment, it is assumed that the rotational speed obtained in a traveling state up to 100 km / h is 3000 rpm, and the 3000 rpm is set as the reference value N1. ) To determine whether the engine speed is high or low (Hi / Lo), and passes the determination result to the fan speed determination unit 6 (step S1 in the flowchart of FIG. 4).

As shown in FIG. 3, the fan rotation speed determining section 6 has fan rotation speed characteristic data tables B-1 and B-2 to be referred to corresponding to Hi / Lo of the engine rotation speed ER. Data table B-1 for engine speed Lo
Is referred to when the engine speed ER is equal to or less than the reference value N1. When the engine is not suddenly loaded, that is, when the accelerator opening is about 4/8 and the vehicle speed SP = 1.
Cooling water temperature H1 that rises when traveling at 00 km / h
Up to this time, the rotation speed R of the cooling fan is kept constant at a low speed R0, and when the cooling water temperature H1 is exceeded, the rotation speed R of the cooling fan is stepped up to a high speed R1. On the other hand, the data table B-2 for the engine speed Hi is referred to when the above-mentioned engine speed ER is equal to or higher than the reference value N1, and a sudden load is applied to the engine. This is to cope with a running state in which the rise is also rapid. If the cooling water temperature is equal to or lower than H0, the rotation speed R of the cooling fan is set to be constant (= R0), and the cooling water temperature is set to H0 to H0.
In the range of 1, the rotation speed R of the cooling fan is increased in proportion to the rise of the cooling water temperature H, and when the cooling water temperature H exceeds H1, the rotation speed R of the cooling fan has a characteristic of rotating at the maximum rotation speed R1. .

Then, based on the Hi / Lo of the engine speed determined by the engine speed comparison unit 5, the fan speed determination unit 6 selects the fan speed characteristic data table B-1 if the speed is low Lo (FIG. 5). Step S2 of Step 4), if the speed is Hi, the fan speed characteristic data table B-2 is selected (Step S3 of FIG. 4), and this data table B-1 or B is selected.
With reference to -2, the cooling fan rotation speed R is determined based on the cooling water temperature H from the water temperature sensor 3 and passed to the fan rotation speed control unit 8 (step S4 in FIG. 4).

The fan rotation speed control unit 8 controls the rotation speed of the cooling fan 7 so as to match the given instruction value of the cooling fan rotation speed R.

Thus, according to the cooling fan rotation speed control apparatus of the first embodiment of the present invention, in the case of a vehicle equipped with a continuously variable transmission, the transmission ratio at which an optimum torque is first obtained for acceleration operation. In order to control the transmission so that the engine speed is increased if the torque is not enough, it is necessary to operate the vehicle in a normal driving state, for example, an operation that does not require the engine to depress the accelerator slowly for acceleration. In operation, the rotation speed of the cooling fan can be kept substantially constant even when accelerating up to 100 km / h, and only the rotation speed of the cooling fan increases while the engine rotation speed does not increase when the accelerator is depressed. Thus, the driver can be quietly controlled without giving a feeling of strangeness to the driver.

Next, a description will be given of a cooling fan rotation speed control apparatus according to a second embodiment of the present invention with reference to FIGS. The cooling fan rotation speed control device according to the second embodiment is characterized by controlling the rotation speed of the cooling fan in a vehicle equipped with a continuously variable transmission and having a function of switching between a manual transmission mode and an automatic transmission mode. Have

As shown in FIG. 5, a cooling fan rotation speed control device according to the second embodiment has a vehicle speed sensor 1, an accelerator opening sensor 2, a cooling device similar to those of the first embodiment shown in FIG. Based on the vehicle speed SP detected by the water temperature sensor 3 and the vehicle speed sensor 1 and the accelerator opening detected by the accelerator opening sensor, the engine speed ER is determined by referring to a shift schedule map M of the continuously variable transmission shown in FIG. An engine speed determining unit 4 for calculating the engine speed, an engine speed comparing unit 5 for comparing the engine speed ER with a predetermined reference value N1 to determine whether the engine speed is high or low (Hi / Lo), A fan rotation speed control unit 8 for controlling the rotation speed of the cooling fan 7 so as to match the number R is provided.

As a characteristic element of the second embodiment, a shift mode determining means for determining whether the shift mode is set to the automatic shift mode (AT) or the manual shift mode (MN). The manual / automatic discriminating section 9 and three types of fan speed characteristic data tables A (for MN) and B-1 (Lo) as shown in FIG.
) And B-2 (for Hi). When the manual / automatic discriminating section 9 determines that the transmission is in the manual transmission mode MN, the characteristic data table A is selected and the automatic transmission mode is selected.
When it is determined that the engine is AT, one of the characteristic data tables B-1 and B-2 is selected according to the level of the engine speed determined by the engine speed comparison unit 5, and the cooling detected by the cooling water temperature sensor 3 is performed. A fan rotation speed determining unit for determining a rotation speed of the cooling fan based on the water temperature and outputting the determined rotation speed to the fan rotation speed control unit; I have.

The fan speed characteristic data table A shown in FIG. 6 is the same as the water temperature H-cooling fan speed characteristic in a vehicle equipped with a normal multi-speed transmission mechanism, as in the conventional example. If the cooling water temperature H rises with this, the cooling fan rotation speed R also rises in proportion thereto.

The fan speed characteristic data table B
-1 and B-2 are the same as those in the first embodiment shown in FIG. In other words, the data table B-1 for the engine speed Lo indicates that, when no sudden load is applied to the engine, for example, the accelerator opening is about 4/8 and the vehicle speed SP = 100.
When traveling at km / h, the rotation speed R of the cooling fan is kept constant at a low speed R0 until the cooling water temperature H1 increases, and when the cooling water temperature H1 is exceeded, the rotation speed R of the cooling fan is increased to a high speed R0.
It has the characteristic of stepping up to 1 and the engine speed Hi
The data table B-2 is used to cope with a running state in which the engine is suddenly loaded and the cooling water temperature H also rises sharply. When the rotation speed R of the fan is constant (= R0) and the cooling water temperature is between H0 and H1, the rotation speed R of the cooling fan is increased in proportion to the rise of the cooling water temperature H, and the cooling water temperature H decreases to H1. If it exceeds, the rotation speed R of the cooling fan has a characteristic of rotating at the maximum rotation speed R1.

Next, the operation of the cooling fan rotation speed control device according to the second embodiment having the above configuration will be described. As shown in the flowchart of FIG. 7, the manual / automatic determination unit 9 determines whether the shift mode is the automatic shift mode AT or the manual shift mode MN, and passes it to the fan speed determination unit 10.

As in the first embodiment, the engine speed determination unit 4 incorporates a shift schedule map M of the continuously variable transmission as shown in FIG. Based on the accelerator opening detected by the accelerator opening sensor 2, the shift schedule map M
To determine the engine speed ER and pass it to the engine speed comparison unit 5.

Similarly to the first embodiment, the engine speed comparison unit 5 sets the engine speed ER to the reference value N1 (here, N1 = 3000 rpm, but as in the first embodiment, there is no particular limitation. It is determined whether the engine speed is high or low (Hi / Lo), and the determination result is passed to the fan speed determination unit 10.

The fan rotation speed determining unit 10 determines the cooling fan rotation speed R according to the procedure shown in the flowchart of FIG.
First, it is determined whether the automatic transmission mode is AT or the manual transmission mode MN (step S0). If the transmission mode is the manual transmission mode MN, the fan speed characteristic data table A is selected (step S01). On the other hand, if the automatic speed change mode is AT, the fan speed characteristic data table B-1 is selected based on the engine speed Hi / Lo determined by the engine speed comparison unit 5 if the speed is low Lo (step S2). If the speed is Hi, the fan speed characteristic data table B-2 is selected (step S3). Then, the selected data tables A, B-
With reference to 1 or B-2, the cooling fan rotation speed R is determined based on the cooling water temperature H from the water temperature sensor 3 and passed to the fan rotation speed control unit 8 (step S4).

The fan rotation speed controller 8 controls the rotation speed of the cooling fan 7 so as to match the given instruction value of the cooling fan rotation speed R.

Thus, according to the cooling fan rotation speed control device of the second embodiment of the present invention, the continuously variable transmission is mounted, and the shift mode between the manual shift mode and the automatic shift mode can be selected. In a vehicle that can be operated, the speed of the cooling fan is controlled to increase the rotation speed of the cooling fan in accordance with the increase in the engine speed as in the conventional case in the manual transmission mode, and the acceleration is performed in the automatic transmission mode. First, adjust the transmission so that the gear ratio can be set to the optimum torque for the operation.If the torque is not enough, perform control to increase the engine speed. If the driving operation is not difficult, such as stepping on the accelerator slowly, the rotation speed of the cooling fan can be kept almost constant even if the vehicle accelerates to 100 km / h.
Even when the engine speed does not increase when the accelerator is depressed, only the cooling fan speed does not increase and the driver does not feel uncomfortable, so that quiet operation control is possible.

In the second embodiment, the fan speed characteristic data tables B-1 and B-2 having two different characteristics depending on the level of the engine speed in the automatic transmission mode.
-2, but the present invention is not limited to this. Simplification in which the fan speed characteristic data table A is used in the manual shift mode and only the fan speed characteristic data table B-1 is used in the automatic shift mode. It is also possible to adopt such a configuration. Further, the characteristic data tables B-2 and A
Although the characteristics are different depending on, it is also possible to make the same.

In both the first and second embodiments, the level of the engine speed is determined based on the reference value N1 of 3000 rpm. Should be changed as appropriate according to the characteristics and characteristics of.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a functional configuration according to a first embodiment of the present invention.

FIG. 2 is a shift schedule map of an engine speed in the embodiment.

FIG. 3 is an explanatory diagram showing a functional configuration of a fan rotation speed determining unit in the embodiment.

FIG. 4 is a flowchart of a cooling fan rotation speed determining operation of a fan rotation speed determining unit in the embodiment.

FIG. 5 is a block diagram showing a functional configuration according to a second embodiment of the present invention.

FIG. 6 is an explanatory diagram showing a functional configuration of a fan rotation speed determining unit in the embodiment.

FIG. 7 is a flowchart of a cooling fan rotation speed determining operation of a fan rotation speed determining unit in the embodiment.

FIG. 8 is a graph showing a relationship between a cooling water temperature and a cooling fan speed in a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vehicle speed sensor 2 Accelerator opening detection part 3 Cooling water temperature sensor 4 Engine rotation speed determination part 5 Engine rotation speed comparison part 6 Fan rotation speed determination part 7 Cooling fan 8 Fan rotation speed control part 9 Manual / automatic determination part 10 Fan rotation Number determination unit

Claims (4)

[Claims] 1. A cooling fan rotation speed control device for a vehicle provided with a continuously variable transmission having an automatic transmission mode in which a speed ratio of the vehicle is automatically changed in a stepless manner, wherein the engine rotation is detected. Number detection means, cooling water temperature detection means for detecting the cooling water temperature, a cooling fan for blowing to the radiator, and fan speed characteristic data relating the cooling water temperature and the rotation speed of the cooling fan corresponding to the engine load. More than one,
A fan rotation speed characteristic data selecting unit that determines an engine load based on the engine rotation speed detected by the engine rotation speed detection unit and selects one from the plurality of fan rotation speed characteristic data; A fan rotation speed determining unit that determines a rotation speed of the cooling fan from a cooling water temperature detected by the cooling water temperature detection unit based on fan rotation speed characteristic data selected by the data selection unit; An apparatus for controlling the number of rotations of a cooling fan, comprising: means for controlling the number of rotations of the cooling fan such that the number of rotations determined by the determination means matches the number of rotations of the cooling fan. 2. The rotation speed of a cooling fan in a vehicle equipped with a continuously variable transmission having an automatic transmission mode in which the transmission ratio of the vehicle is automatically changed in a stepless manner and a manual transmission mode in which the occupant manually changes the transmission ratio. A control device, wherein: a shift mode determining means for determining whether a current shift mode is an automatic shift mode or a manual shift mode; a cooling water temperature detecting means for detecting a cooling water temperature; a cooling fan for blowing air to a radiator; A plurality of fan rotation speed characteristic data in which the water temperature and the rotation speed of the cooling fan are associated with each other in the automatic shift mode and the manual shift mode, respectively, and correspond to the shift mode determined by the shift mode determining unit. Fan speed characteristic data selecting means for selecting the fan speed characteristic data to be selected; and a fan selected by the fan speed characteristic data selecting means. Fan rotation speed determining means for determining the rotation speed of the cooling fan from the cooling water temperature detected by the cooling water temperature detection device based on the fan rotation speed characteristic data; and the rotation speed determined by the fan rotation speed determination device. A cooling fan rotation speed control device, comprising: fan rotation speed control means for controlling the cooling fan so that the number of rotations matches the rotation speed of the cooling fan. 3. The rotation speed of a cooling fan in a vehicle equipped with a continuously variable transmission having an automatic transmission mode in which the transmission ratio of the vehicle is automatically changed in a stepless manner and a manual transmission mode in which the occupant manually changes the transmission ratio. A control device, comprising: a shift mode determining means for determining whether a current shift mode is an automatic shift mode or a manual shift mode; an engine speed detecting means for detecting an engine speed; and a coolant temperature for detecting a coolant temperature. Detecting means, a cooling fan that blows air to the radiator, and fan rotation speed characteristic data in which the cooling water temperature and the rotation speed of the cooling fan are associated with each other in the automatic shift mode and the manual shift mode in accordance with the engine load. A plurality of gear shift mode determining means for determining an engine load based on an engine speed detected by the engine speed detecting means; Fan speed characteristic data selecting means for selecting the fan speed characteristic data corresponding to the determined shift mode; and the cooling based on the fan speed characteristic data selected by the fan speed characteristic data selecting means. A fan rotation speed determining unit that determines the rotation speed of the cooling fan from the cooling water temperature detected by the water temperature detection unit; and the rotation speed determined by the fan rotation speed determination unit matches the rotation speed of the cooling fan. And a fan rotation speed control means for controlling the cooling fan. 4. The fan speed characteristic data selecting means, in the automatic speed change mode, when the engine load exceeds a predetermined engine load, increases the cooling fan speed in a stepwise manner as the cooling water temperature increases. Selecting the first characteristic data, and selecting the second characteristic data for continuously changing the cooling fan speed substantially in proportion to the cooling water temperature when the predetermined engine load is not exceeded. The cooling fan rotation speed control device according to claim 1.