JPH0558172A - Control device for moving grill - Google Patents

Abstract

PURPOSE:To provide a control device for a moving grill which cools a substance to be cooled at a proper cooling temperature without rapidly changing a cooling water temperature. CONSTITUTION:Connection is effected such that a cooling water temperature (t) detected by a cooling water temperature meter 58 is inputted to a control device 60 through an amplifying circuit 70. The control device 60 is connected to a motor 42 being a drive source to open and close a radiator grill 22 and a motor 56 being a drive source to open and close a front cross member 44 through drivers 72 and 74. Based on an inputted cooling water temperature, the opening and closing state of the radiator grill 22 and the front cross member 44 are decided. The motors 42 and 56 are run according to the decided opening and closing state of the radiator grill 22 and the front cross member 44.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control system for a movable grill, and more particularly to a control system for a movable grill which controls the opening and closing of a movable grill for supplying outside air provided around a radiator and a cooler condenser of a vehicle.

[0002]

2. Description of the Related Art Conventionally, in a vehicle which is driven by a water-cooled engine, an engine cooling medium (for example, water) is cooled and circulated by a radiator provided in an engine room of the vehicle. Further, in a vehicle equipped with an air conditioner, a cooler condenser used for the air conditioner is provided, and the cooler condenser may be cooled. In order to improve the cooling effect of the object to be cooled such as the radiator, a movable grill that can take in the outside air from the front of the vehicle and a movable grill that can take in the outside air from the lower side of the vehicle have been developed (KOKAI Sho 61-35693). No., Jitsukaihei 2-99073).

Further, in order to improve the aerodynamic characteristics of the vehicle body and reduce the air resistance coefficient (C _D ), the water temperature of the radiator is detected by a water temperature sensor, and based on the detected value, the movable members provided above and below the front bumper are movable. A device for simultaneously opening and closing the grill has been proposed (Japanese Utility Model Publication No. 60-110625). According to this, focusing on the fact that opening the movable grill increases the air resistance due to the air flow of the outside air supplied to the inside of the vehicle body, and closing the movable grill according to the water temperature of the radiator, that is, the engine load condition, reduces the air resistance. Can be reduced.

[0004]

However, by simultaneously opening and closing the movable grills provided above and below the front bumper according to the water temperature of the radiator, the cooling effect of the object to be cooled changes significantly. That is, outside air is introduced into the vehicle at the same time when the movable grill is opened, and outside air is blocked when the movable grill is closed. Since the object to be cooled is cooled according to the flow rate of the introduced outside air, when the movable grill is opened and closed at the same time, the temperature of the cooling water of the radiator may change rapidly. Due to the rapid temperature change of the cooling water temperature, engine performance may deteriorate.

In view of the above facts, an object of the present invention is to provide a control device for a movable grill, which can cool an object to be cooled with an appropriate cooling temperature without the temperature of the cooling water changing rapidly.

[0006]

In order to achieve the above object, the invention according to claim 1 is to open and close a first movable grill for taking in outside air from the front of the vehicle, and to the lower or side of the vehicle. In a control device for a movable grill that controls opening and closing of a second movable grill that can be opened and closed for taking in outside air from the vehicle, engine load condition detection means for detecting an engine load condition, and the detected engine load condition becomes large. Therefore, a control means for controlling the first movable grill to open after opening the second movable grill is provided.

According to a second aspect of the present invention, a first movable grill that can be opened and closed to take in outside air from the front of the vehicle and a second movable movable grill that can be taken in to take in outside air from below or from the side of the vehicle. In a control device for a movable grill that controls opening and closing of a grill, engine load condition detecting means for detecting an engine load condition, engine load condition increasing rate detecting means for detecting an increasing rate of the engine load condition, and the detected engine load. When the condition increase rate is equal to or lower than a predetermined value, the detected engine load is controlled so that the second movable grill is opened and then the first movable grill is opened as the detected engine load condition increases. A control means for controlling the first movable grill and the second movable grill to open when the rate of increase in condition exceeds a predetermined value. It is.

According to a third aspect of the invention, a first movable grill that can be opened and closed to take in outside air from the front of the vehicle and a second movable movable grill that can be taken in to take in outside air from below or from the side of the vehicle. In a control device for a movable grill, which controls opening and closing of a grill, an engine load condition detecting means for detecting an engine load condition, a vehicle height detecting means for detecting a vehicle height, and a detected vehicle height when the vehicle height is equal to or more than a predetermined value. Controls to open the second movable grill and then to open the first movable grill as the detected engine load condition increases, and when the detected vehicle height is lower than a predetermined value, the first movable grill is opened. The control means for controlling the second movable grill to be closed and to open / close the first movable grill based on the detected engine load condition.

According to a fourth aspect of the invention, a first movable grill that can be opened and closed to take in outside air from the front of the vehicle, and a second movable movable grill that can be taken in to take in outside air from below or from the side of the vehicle. In a control device for a movable grill that controls opening and closing of a grill, an engine load condition detecting means for detecting an engine load condition, and a detected engine load condition becomes large when the detected engine load condition is a predetermined value or less. According to the control, the first movable grill is opened after the second movable grill is opened, and the detected engine load condition exceeds a predetermined value and the first movable grill is opened.
When the movable grill and the second movable grill are opened, the control means for interrupting the engine load that applies a load to the engine is provided.

[0010]

According to the invention described in claim 1, the engine load condition detecting means detects the engine load condition. As the engine load condition, it is possible to use a cooling medium for cooling the engine, for example, a cooling water temperature, an engine block temperature, an engine oil temperature, an exhaust temperature, an accelerator opening degree, a physical quantity such as a fuel injection amount. It is possible to specify the engine load by detecting at least one of the physical quantities. Further, the engine load can be specified based on the relationship between the accelerator opening, the vehicle speed and the acceleration. For example, it can be determined that the load is high when the accelerator is fully open but the vehicle speed is slow and the vehicle is not accelerating at a low speed, while the accelerator is fully closed but vehicle speed is accelerating quickly when the vehicle is downhill. The control means controls to open the second movable grill and then to open the first movable grill as the detected engine load condition increases. The first movable grill can be opened and closed to take in the outside air from the front of the vehicle, and the second movable grill can be opened and closed to take in the outside air from below or from the side of the vehicle. In this way, since the control for sequentially opening the second movable grill and the first movable grill is performed so that an appropriate cooling effect can be obtained as the engine load condition increases, outside air is appropriately supplied to the cooling medium. Thus, the object to be cooled can be cooled, and abrupt temperature change can be prevented.

According to the second aspect of the invention, the engine load condition detecting means detects the engine load condition and also detects the engine load condition increasing rate based on the engine load condition detected by the engine load condition increasing rate detecting means. To do. The physical quantity described in claim 1 can be used as the engine load condition, and the engine load can be specified by detecting at least one of the physical quantities. When the detected engine load condition is less than or equal to a predetermined value, the control means opens the second movable grill and then the first movable grill as the engine load condition increases, and the detected engine load condition rises. When the rate exceeds a predetermined value, the first movable grill and the second movable grill are controlled to open. The first movable grill can be opened and closed to take in the outside air from the front of the vehicle, and the second movable grill can be opened and closed to take in the outside air from below or from the side of the vehicle. In this way, as the engine load condition increases, the control for opening the second movable grill and the first movable grill in order is performed to cool the cooling medium, and it is possible to prevent a sudden temperature change, Since the first movable grill and the second movable grill are opened when the increase rate of the load condition exceeds the predetermined value, the engine load condition, for example, the rise of the cooling water temperature can be suppressed early.

According to the invention described in claim 3, the engine load condition detecting means detects the engine load condition and the vehicle height detecting means detects the vehicle height. The physical quantity described in claim 1 can be used as the engine load condition, and the engine load can be specified by detecting at least one of the physical quantities. When the detected vehicle height is equal to or higher than a predetermined value, the control means opens the second movable grill and then the first movable grill as the detected engine load condition increases, and then the detected vehicle height. Is lower than a predetermined value, the second movable grill is controlled to be closed. The first movable grill can be opened and closed to take in the outside air from the front of the vehicle, and the second movable grill can be opened and closed to take in the outside air from below or from the side of the vehicle. In this way, the cooling medium can be appropriately cooled by performing control to sequentially open the second movable grill and the first movable grill so that an appropriate cooling effect can be obtained as the engine load condition increases. A sudden temperature change can be prevented, and when the vehicle height is lower than a predetermined value, the second movable grill is closed, so that the second movable grill interferes with an obstacle surface below the vehicle, for example, the ground. Can be prevented.

According to the fourth aspect of the present invention, the engine load condition detecting means detects the engine load condition. The physical quantity described in claim 1 can be used as the engine load condition, and the engine load can be specified by detecting at least one of the physical quantities. When the engine load condition is less than or equal to a predetermined value, the control means opens the second movable grill and then opens the first movable grill as the detected engine load condition increases. Also, the control means shuts off the engine load that applies a load to the engine when the engine load condition exceeds a predetermined value and the first movable grill and the second movable grill are open. An example of an engine load that applies a load to the engine is a compressor used in an air conditioner, and the load on the engine is reduced by cutting off the power supply to an electromagnetic clutch that connects the compressor and the engine. be able to. The load on the engine can also be reduced by cutting off the electrical connection of the defogger, light, audio, etc. connected to the battery. In this way, the second movable grill and the first movable grill can be sequentially opened to appropriately cool the cooling medium so that an appropriate cooling effect can be obtained as the engine load condition increases, and a rapid temperature change can be achieved. By preventing the engine load, and by shutting off the engine load that applies a load to the engine when the engine load condition is equal to or more than the predetermined value even when the first movable grill and the second movable grill are open. It is possible to prevent overload on the engine.

[0014]

Embodiments of the present invention will now be described in detail with reference to the drawings.

[First Embodiment] A first embodiment of the movable grill according to the present invention will be described with reference to the drawings.

In the figure, the arrow FR indicates the front direction of the vehicle body, the arrow IN indicates the inward direction of the vehicle width, and the arrow UP indicates the upward direction of the vehicle body.

In the first embodiment, the radiator grille 22 is set in accordance with the engine cooling water temperature as one of engine load conditions.
Also, the front cross member 44 is opened and closed.

As shown in FIG. 1, an engine hood 12 is arranged on the upper surface of the front body 10A of the vehicle body 10. The engine hood 12 is provided by a hinge (not shown) provided at the rear end. It is swingably attached to the body frame.

Front bumpers 16 are fixed to both front and rear ends of the front body 10A in the vehicle width direction. A front end portion of the engine hood 12 is a projecting portion 18 that has an external appearance that extends toward the bumper 16. Further, an outside air intake 20 is provided in the projecting portion 18 of the engine hood 12, and a radiator grill 22 as a first movable grill which is elongated in the vehicle width direction is arranged in the outside air intake 20. Has been done.

As shown in FIG. 2, the radiator grill 22 is composed of a radiator grill outer panel 24 which constitutes an outer portion of the radiator grill 22 and a radiator grill inner panel 26 which constitutes an inner portion of the radiator grill 22. ing. One attachment portion 30A of the hinge 30 is fixed to the radiator grill inner panel 26.

The other mounting portion 30B of the hinge 30 is fixed to the bottom of the engine hood 12. Therefore, the radiator grill 22 can be swung about the shaft 30C of the hinge 30 in the clockwise direction of FIG. 2 (direction of arrow A in FIG. 2) and the direction opposite to the clockwise direction of FIG. 2 (direction of arrow B in FIG. 2). Is.

Hinge 3 fixed to the engine hood 12
The motor bracket 40 is fixed to the rear of the 0 mounting portion from the lower side in the vehicle body vertical direction. This motor bracket 4
A motor 42 is fixed at 0.

A motor link (not shown) is connected to the rotary shaft of the motor 42, and this motor link is configured to reach the radiator grill 22. Further, the motor 42 is connected to a control device 60 as a control means having a microcomputer. The motor 42 rotates in response to the control signal output from the control device 60 so that the radiator grill 22 can be moved from the closed state (state shown by the solid line in FIG. 3) to the open state (state shown by the phantom line in FIG. 3). Is becoming

Therefore, when the radiator grill 22 is open, the outside air F2 flowing from the front of the radiator grill 22 is supplied to the inside of the vehicle body 10 through the outside air intake port 20 provided in the projecting portion 18 of the engine hood 12. (See FIG. 3).

As shown in FIG. 3, the front body 10
Inside A is an engine room, an engine (not shown) is arranged, and a suction fan 33 is arranged on the front side of the engine in the front-rear direction of the vehicle body. The radiator 32 is provided on the front side in the vehicle front-rear direction of the suction fan 33.
Is arranged, and the radiator 32 is a suction fan 33.
It is cooled by the outside air sucked in. Further, the radiator 32 is provided with a cooling water temperature gauge 58 as one of engine load condition detecting means, and measures the cooling water temperature T (° C). Radiator 3
A cooler condenser 34 is arranged on the front side of the vehicle body 2 in the front-rear direction with a gap 31 therebetween, and the cooler condenser 34 is arranged so as to be open downward with respect to the radiator 32.

An opening 16A is provided at the bottom of the bumper 16, and a spoiler 28 is provided at the lower end of the bumper 16. Therefore, the outside air F1 is supplied into the vehicle body 10 through the opening 16A provided in the lower portion of the bumper 16. The lower end of the bumper 16 is connected to the engine under cover 14 that closes the bottom of the front body 10A.

Radiator 32 and cooler condenser 3
4 are respectively supported by the radiator support 35.
A front cross member 44 serving as a second movable grill is disposed below the radiator support 35.

As shown in FIG. 4, the front cross member 44 includes a member front 46 forming the front portion of the front cross member 44 and a member rear 48 forming the rear portion of the front cross member 44. The front 46 and the member rear 48 have a closed cross-section structure extending in the vehicle width direction.

The member front 46 has a U-shaped cross section with an opening at the rear side in the front-rear direction of the vehicle body. Further, as shown in FIG. 3, the member front 46 is fixed to the engine undercover 14 and has an elongated hole 37 as a substantially rectangular outside air inlet extending in the vehicle width direction.

The member rear 48 has a lower end bent toward the rear side in the front-rear direction of the vehicle body and has a substantially L-shaped cross section.
The member rear 48 is welded to the member front 46.

The member rear 48 is provided with a hole 36 as an outside air inlet and an elongated hole 38 as a substantially rectangular outside air inlet extending in the vehicle width direction.

As shown in FIG. 4, a member panel 50 as a lid is provided at the lower portion of the front cross member 44 by a hinge 52 in the clockwise direction of FIG. 4 (direction of arrow C in FIG. 4) and the clock of FIG. Direction opposite to direction (arrow D direction in Fig. 4)
Is swingably supported. The front end portion of the member panel 50 is bent in a direction that is the upper side in the vertical direction of the vehicle body when the member panel is closed (state shown by the solid line in FIG. 4) and overlaps the lower end portion of the front portion of the member front 46.

A link device (not shown) is attached to the member panel 50, and a rotary shaft of a motor 56 is connected to the link device. Further, the motor 56 is connected to a control device 60 equipped with a microcomputer. The motor 56 is driven to rotate in response to the control signal output from the control device 60, and the front cross member 44 is closed from the closed state (the state indicated by the solid line in FIG. 4) for closing the elongated hole 37 of the member front 46 to the length of the member front 46. The hole 37 can be moved to the open state (open line in FIG. 4).

Therefore, the long hole 3 of the member front 46
In the open state where 7 is opened, as shown in FIG. 3, the outside air F3 flowing below the engine undercover 14 has the long hole 37 of the member front 46 and the hole 3 of the member rear 48.
6 and the slot 38, and is supplied to the gap 31.

Although not shown, a vehicle height sensor 59 for detecting the vehicle height is attached to the suspension of the vehicle.

Further, as shown in FIG. 14, a side as one of the second movable grilles which can be opened and closed for taking in outside air between the cooler condenser 34 and the radiator 32 from at least one side surface side of the vehicle. A member 82 is provided. The side member 82 is attached to the radiator support 35. The side member 82 allows the outside air to be taken in by opening the side member panel 84, and the cooler condenser 34 and the radiator 3 are provided.
The outside air is introduced between the two. The side member 82 may be opened and closed by sliding to open and close the side member panel 84, or by swinging the side member panel 84 via a hinge fixed to the vehicle body.

As shown in FIG. 5, the control device 60 has a configuration shown in FIG.
It is composed of a microcomputer provided with a read only memory (ROM) 64 storing a program of the control routine shown in FIG. 1, a random access memory (RAM) 66, and a central processing unit (CPU) 62. The control device 60 also includes an input / output circuit (I / O) 68 that performs input / output with an external device, and the I / O 68 is connected to an amplifier circuit 70 and drivers 72 and 74. The driver 72 and the driver 74 are connected to the motor 42 and the motor 56. The cooling water temperature T detected by the cooling water thermometer 58 is connected to the control device 60 so as to be input via the amplification circuit 70. Further, the control device 60 is connected to the vehicle height sensor 59 via an amplifier circuit 76, and a voltage signal according to the vehicle height is input to the control device 60. The output signals of the cooling water temperature gauge 58 and the vehicle height sensor 59 may be input to the control device 60 via a low pass filter. By passing this output signal through a low-pass filter, high frequency noise at the time of detecting the cooling water temperature and the vehicle height is removed.

As shown in Table 1 below, the ROM 64 stores a table showing the relationship between the open / closed states of the radiator grill 22 and the front cross member 44 and the engine cooling water temperature according to the engine cooling water temperature. Has been done.

[0039]

[Table 1] However, t0, t1: set temperature X: closed ◯: open That is, when the cooling water temperature t is t <t0, the flag F is set to 0.
As a result, the radiator grill 22 and the front cross member 44 are closed. When the cooling water temperature t is t0≤t <t1, the flag F is set to 1 to close the radiator grille 22 and open the front cross member 44. When the cooling water temperature t is t1≤t, the flag 2 is set to open the radiator grille 22 and open the front cross member 44.

Next, the operation of the first embodiment will be described according to the control program stored in the control device 60.

First, when the occupant turns on the ignition key of the vehicle and starts the engine, the control routine shown in FIG. 6 is executed. When this control routine is executed, the routine proceeds to step 110, where the initialization of this control program is performed. In this initial setting, the set temperatures t0 and t1 of the cooling water temperature are fetched and the flag F is set to 0. The flag F represents the open / closed state of each of the radiator grille 22 and the front cross member 44 with respect to the detected cooling water temperature.

When the initial setting is completed, the routine proceeds to step 120, where the cooling water temperature gauge 58 reads the cooling water temperature t. When the reading of the cooling water temperature t is completed, the routine proceeds to step 122,
It is determined whether t <t0. If t <t0, the current cooling water temperature t is less than the predetermined temperature t0, and thus step 126
Then, the flag F is set to 0, and the radiator grille 22 and the front cross member 44 are closed with reference to Table 1 as described above. On the other hand, when t ≧ t0, the process proceeds to step 124, it is determined whether t1 ≦ t, and t1
If ≦ t, the process proceeds to step 130. Step 13
At 0, since the current cooling water temperature t is equal to or higher than the predetermined temperature t1, the flag F is set to 2 and the front cross member 44 is set.
Open (see Table 1). Step 1 if t1> t
28, the flag F is set to 1, and the radiator grille 22 and the front cross member 44 are opened (see Table 1). Note that the above steps 126, 128 and 13
When the flag F is in the same state at 0, it is not necessary to open and close the radiator grille 22 and the front cross member 44, and therefore the opening and closing process may not be performed.

As described above, in this routine, the cooling water temperature t
Is t <t0, the flag F is set to 0, and t1>
When t ≧ t0, the flag F is set to 1 and t1 ≦ t
In this case, the flag F is set to 2. Therefore, the flag F is sequentially set to 0, 1, and 2 as the cooling water temperature t increases. Since the radiator grill 22 and the front cross member 44 are opened and closed according to the state of the flag F, when the radiator grill 22 and the front cross member 44 both shift from the closed state to the open state, outside air is introduced from below the vehicle. After the front cross member 44 for opening is opened, the radiator grille 22 for introducing outside air from the front of the vehicle is opened (Table 1).
reference).

When the opening / closing process of the radiator grill 22 and the front cross member 44 is completed, the routine proceeds to step 132. In step 132, it is judged whether or not the ignition key is turned off. If the ignition key is still turned on, the process returns to step 120, and if the ignition key is turned off, this routine is ended.

In step 132, if a positive determination is made, the process may return to step 120 after a lapse of a predetermined time. By doing so, the opening / closing process of the radiator grill 22 and the front cross member 44 can be performed every predetermined time.

As described above, the flag is set according to the engine cooling water temperature t, and the radiator grille 22 and the front cross member 44 are opened / closed according to the set flag, that is, the open / closed state. That is, as the engine cooling water temperature t increases, the front cross member 44,
The radiator grille 22 is opened in this order. Therefore,
When the front cross member 44 is opened and the outside air of F3 shown in FIG. 3 is taken in, the radiator 3
The outside air supplied to the second passage 2 passes through the radiator grill 22 and is heated by the cooler condenser 34 (outside air F
1 and F2 (see FIG. 3) only, fresh fresh air that has passed through the front cross member 44 is supplied, so that the temperature rise of the cooling water temperature of the radiator 32 can be reduced. If the temperature is larger than the predetermined value based on the cooling water temperature t, the front cross member 44
Since the radiator grille 22 is opened, fresh outside air is supplied to the front of the vehicle, so that the temperature of the cooler condenser and the radiator can be quickly lowered.

As described above, in this embodiment, the radiator grill 22 and the front cross member 44 are opened and closed stepwise in accordance with the cooling water temperature, so that the object to be cooled is properly cooled and the cooling water by the radiator 32 is cooled. The heat exchange is properly performed, the engine and other objects to be cooled can be efficiently cooled, and abrupt temperature change of the cooling water can be prevented.

[Second Embodiment] In the first embodiment, the case where the radiator grill 22 and the front cross member 44 are opened / closed by the cooling water temperature of the engine has been described. However, as the second embodiment, the engine cooling water temperature and the cooling water temperature are changed. A case where the radiator grill 22 and the front cross member 44 are opened and closed according to the temperature increase rate will be described.

Since the structure of the vehicle used in the second embodiment is the same as that of the first embodiment, the same parts are designated by the same reference numerals and detailed description thereof will be omitted.

Further, in the second embodiment, the ROM 64 is
As shown in Table 2 below, a table indicating the relationship between the open / closed states of the radiator grill 22 and the front cross member 44 and the flags indicating the open / closed states of the radiator grill 22 and the front cross member 44 is stored.

[0051]

[Table 2] However, X: closed ◯: open Further, the above flags based on the relationship between the cooling water temperature t and the temperature increase rate dt are as shown in Table 3 below.

[0052]

[Table 3] However, b: set value (rate of temperature increase) Hereinafter, the operation of the second embodiment will be described according to a control program stored in the control device 60.

First, when the occupant turns on the ignition key of the vehicle and starts the engine, the control routine shown in FIG. 7 is executed. When this control routine is executed, the routine proceeds to step 210, where this control program is initialized. In this initial setting, the set temperatures t0 and t1 of the cooling water temperature are taken in and the temperature rise rate dt
The set values a and b of are taken. The set value a is a unit time when calculating the temperature increase rate, and the set value b is set to the maximum value of the allowable temperature increase rate range. Further, in step 210, the flag F is set to 0.
This flag F represents the open / closed state of each of the radiator grille 22 and the front cross member 44 with respect to the detected cooling water temperature.

When the initial setting is completed, the routine proceeds to step 220, where the cooling water temperature gauge 58 reads the cooling water temperature t. In step 220, the cooling water temperature t detected as the previous temperature T is set only when the routine is first executed. When the reading of the cooling water temperature t is completed, the routine proceeds to step 222, and it is judged whether or not the current cooling water temperature t is less than the set temperature t0 by judging whether or not t <t0. t <t0
In this case, the flag F is set to 0 in step 230, and the radiator grille 22 and the front cross member 44 are closed with reference to Table 2 as described above.
When this process ends, the routine proceeds to step 236. On the other hand, t
When ≧ t0, in step 224, the temperature rise rate dt of the cooling water temperature is calculated based on the following equation (1).

Dt = (T−t) / a −−− (1) where t: current cooling water temperature T: previous cooling water temperature a: constant (interval of detection time of temperature detection) calculation of temperature rise rate dt Is completed, the process proceeds to step 226, it is determined whether dt> b, and if dt> b, that is, if the temperature rise rate of the cooling water temperature is larger than a predetermined value, the process proceeds to step 234. In step 234, the flag F
And set the radiator grille 22 and the front cross member 44 (see Table 2). When this process ends, the routine proceeds to step 236. If dt ≦ b, the process proceeds to step 228, and it is determined whether t1 ≦ t.
If t1 ≦ t, that is, if the cooling water temperature t is the predetermined temperature t1
In the above case, the process proceeds to step 234. When t1> t, the routine proceeds to step 232, the flag F is set to 1, the radiator grille 22 is closed, the front cross member 44 is opened (see Table 2), and the routine proceeds to step 236. At step 236, the current cooling water temperature t is set as the previous temperature T when the next temperature increase rate dt is calculated, and the routine proceeds to step 238. Note that the above steps 230 and 23
2 and 234, when the state of the flag F is the same, the radiator grille 22 and the front cross member 44
Since it is not necessary to open and close, it is not necessary to perform the opening and closing process.

In step 236, it is judged whether or not the ignition key is turned off. If the ignition key is still turned on, the process returns to step 220, and if the ignition key is turned off, this routine is ended.

In step 238, if a positive determination is made, the process may return to step 220 after a predetermined time has elapsed. By doing so, the unit time for calculating the temperature rise rate can be freely set, and the opening / closing processing of the radiator grille 22 and the front cross member 44 can be performed delicately.

As described above, in the second embodiment, it is possible to predict the temperature rise of the object to be cooled such as the radiator and the cooler condenser by detecting the temperature rise rate dt of the cooling water temperature, and the temperature rise rate dt. When the temperature is high, by opening the radiator grill 22 and the front cross member 44, it is possible to suppress an increase in the temperature of the cooled object at an early stage.

[Third Embodiment] Next, a third embodiment of the movable grill according to the present invention will be described with reference to the drawings.

In the third embodiment, the radiator grill 22 and the front cross member 44 are opened and closed according to the engine cooling water temperature and the vehicle height.

Since the structure of the vehicle used in the third embodiment is similar to that of the first embodiment, the same parts are designated by the same reference numerals and detailed description thereof will be omitted.

In addition, in the third embodiment, the same table as the table 2 shown in the second embodiment in which the open / closed states of the radiator grill 22 and the front cross member 44 correspond to the flags is used. Then, the flag indicating the open / closed state of the radiator grill 22 and the front cross member 44 based on the relationship between the cooling water temperature t and the vehicle height h is shown in Table 4 below.
As shown in.

[0063]

[Table 4] However, t: cooling water temperature t0, t1: set value h: vehicle height H0: set value Hereinafter, the operation of the third embodiment will be described according to a control program stored in the control device 60.

First, when the passenger turns on the ignition key of the vehicle to start the engine, the control routine shown in FIG. 8 is executed. When this control routine is executed, the routine proceeds to step 310, where this control program is initialized. In this initial setting, the set temperatures t0 and t1 of the cooling water temperature are taken in, the set value H0 of the vehicle height h is taken in, and the flag F is set to 0. The flag F represents the open / closed state of each of the radiator grille 22 and the front cross member 44 with respect to the detected cooling water temperature.

When the initial setting is completed, the process proceeds to step, where the cooling water temperature gauge 58 reads the cooling water temperature t. Cooling water temperature t
When the reading of is finished, the process proceeds to step 320, and the cooling water temperature t is read by the cooling water temperature gauge 58. When the reading of the cooling water temperature t is completed, the routine proceeds to step 322, where the vehicle height sensor 59 reads the vehicle height h. When the reading of the vehicle height h is completed, the process proceeds to step 324, and it is determined whether t <t0. When t <t0, the routine proceeds to step 322, the flag F is set to 0, and the radiator grill 22 and the front cross member 4 are referred to with reference to Table 2 as described above.
Close 4 When this process ends, the process proceeds to step 340.

On the other hand, if t ≧ t0, step 326
Then, it is determined whether t1 ≦ t. If t1 ≦ t, the process proceeds to step 330. If t1> t, the process proceeds to step 3.
Proceed to 28. In step 328, it is determined whether or not H0 <h. If H0 <h, the process proceeds to step 334, the flag F is set to 1, the radiator grille 22 is closed, and the front cross member 44 is opened (see Table 2). ..
When H0 ≧ h, the routine proceeds to step 336, where the flag F is set to 2, the front cross member 44 is closed, and the radiator grill 22 is opened (see Table 2).

At step 330, it is judged whether or not H0 <h. If H0 <h, the routine proceeds to step 338, where flag F is set to 3 and the front cross member 44 is set.
And open the radiator grille 22 (see Table 2). H0
If ≧ h, the process proceeds to step 336. In steps 332, 334, 336 and 338, when the flag F is in the same state, it is not necessary to open and close the radiator grill 22 and the front cross member 44, so the opening / closing process may not be performed.

When the opening / closing process of the radiator grill 22 and the front cross member 44 is completed, the routine proceeds to step 340. In step 340, it is determined whether or not the ignition key is turned off. If the ignition key is on, the process returns to step 320, and if the ignition key is off, this routine ends.

As described above, in the third embodiment, since the radiator grill 22 and the front cross member 44 are opened according to the cooling water temperature, the cooling water can be cooled properly, and when the vehicle height is low. Front cross member 4
Since 4 is closed, it is possible to prevent the front cross member 44 and the ground from interfering with each other when the vehicle height is low.

[Fourth Embodiment] Next, a fourth embodiment of the movable grill according to the present invention will be described with reference to the drawings.

In the fourth embodiment, the radiator grille 22 and the front cross member 44 are opened / closed and the load power is cut off in accordance with the engine cooling water temperature.

Since the structure of the vehicle used in the fourth embodiment is similar to that of the first embodiment, the same parts are designated by the same reference numerals and detailed description thereof will be omitted.

Further, in the fourth embodiment, the same table as the table 2 shown in the second embodiment is used, and the table showing the relationship between the open / closed states of the radiator grill 22 and the front cross member 44 and the flags is used. Based on the relationship between the cooling water temperature t and the vehicle height h shown in the third embodiment, Table 4 corresponding to the flags indicating the open / closed states of the radiator grill 22 and the front cross member 44 is used.

The operation of the fourth embodiment will be described below according to the control program stored in the control device 60.

First, when the occupant turns on the ignition key of the vehicle and starts the engine, the control routine shown in FIG. 9 is executed. When this control routine is executed, the routine proceeds to step 410, where this control program is initialized. In this initial setting, the set temperatures t0 and t1 of the cooling water temperature and the set value H0 of the vehicle height h are taken in, and the set values a and b of the temperature increase rate dt are taken in.
The set value a is a unit time when calculating the temperature increase rate, and the set value b is set to the maximum value of the allowable temperature increase rate range. The flag F is set to 0. The flag F represents the open / closed state of each of the radiator grille 22 and the front cross member 44 with respect to the detected cooling water temperature.

When the initial setting is completed, the routine proceeds to step 420, where the cooling water temperature gauge 58 reads the cooling water temperature t and the vehicle height h (steps 420 and 422), and the routine proceeds to step 424. In step 424, it is determined whether or not t <t0. If t <t0, the process proceeds to step 436, and the flag F is set to 0. In step 436, the radiator grill 22 and the front cross member 44 are closed with reference to Table 2 as described above.

On the other hand, when t ≧ t0 in step 424, the process proceeds to step 426, and the equation (1) described above is used.
The temperature rise rate dt of the cooling water temperature is calculated based on When the calculation of the temperature rise rate dt is completed, the process proceeds to step 428, it is determined whether dt> b, and if dt> b, the process proceeds to step 434. If dt ≦ b, step 430
Then, it is determined whether t1 ≦ t or not. If t1 ≦ t, the process proceeds to step 434. If t1> t, the process proceeds to step 432. In step 432, it is determined whether or not H0 <h. If H0 <h, the process proceeds to step 438, the flag F is set to 1, the radiator grille 22 is closed, and the front cross member 44 is opened (see Table 2). ). When H0 ≧ h, the routine proceeds to step 440, where the flag F is set to 2, the radiator grille 22 is opened, and the front cross member 44 is closed (see Table 2).
In step 434, it is determined whether or not H0 <h, and H0 <h
In the case of h, the process proceeds to step 442, the flag F is set to 3, and the radiator grille 22 and the front cross member 44 are opened (see Table 2). If H0 ≧ h, the process proceeds to step 440, and the flag F is set to 2.
Note that the above steps 436, 438, 440 and 442.
In the case where the flags F are in the same state, it is not necessary to open and close the radiator grille 22 and the front cross member 44, and therefore the opening and closing process may not be performed.

When the opening / closing process of the radiator grill 22 and the front cross member 44 is completed, the routine proceeds to step 44, where the current cooling water temperature t is set as the previous temperature T when the next temperature increase rate dt is calculated, and the routine proceeds to step 446. ..

In step 446, it is determined whether or not the ignition key has been turned off. If the ignition key is on, the process returns to step 420, and if the ignition key is off, this routine ends.

As described above, in the fourth embodiment, the radiator grille 2 is adjusted according to the cooling water temperature, the temperature rise rate and the vehicle height.
2 and the front cross member 44 are opened and closed. That is, the front cross member 44 and the radiator grill 22 are opened in this order as the cooling water temperature rises. As a result, the object to be cooled is properly cooled, the heat exchange of the cooling water by the radiator 32 is properly performed, the engine and other objects to be cooled can be efficiently cooled, and a rapid temperature change of the cooling water is prevented. be able to. Also, the temperature rise rate dt
The process of opening and closing the radiator grille 22 and the front cross member 44 by means of the above, that is, when the temperature increase rate dt exceeds a predetermined increase rate, both the radiator grille 22 and the front cross member 44 are opened and the temperature of the engine cooling water temperature is quickly increased. Suppress the rise. Furthermore, control based on vehicle height is added. According to this, by closing the front cross member 44 when the vehicle height is low, it is possible to prevent the front cross member 44 and the ground from interfering with each other.

[Fifth Embodiment] In the above embodiment, the radiator grille 2 is based on the cooling water temperature, the rate of temperature rise, and the vehicle height.
2 and the case of controlling the opening and closing of the front cross member 44 have been described, the control of opening and closing the radiator grille 22 and the front cross member 44 based on the cooling water temperature, the rate of temperature rise and the vehicle height includes the radiator grille 22 when the vehicle is parked. A case will be described as a fifth embodiment in which opening / closing control of the front cross member 44 and a fail safe mode for cutting off load power as an engine load as necessary are added.

Since the structure of the vehicle used in the fifth embodiment is the same as that of the first embodiment, the same parts are designated by the same reference numerals and detailed description thereof will be omitted.

As shown in FIG. 10, I of the controller 60
A driver 78 is connected to the / O 68, and a control signal output from the control device 60 is input to the switch unit 80. The switch section 80 is composed of a plurality of switches, and each switch includes an electric device that is not directly related to the running of the vehicle (that does not cause an immediate disadvantage in safety), for example, an air conditioner compressor and an engine. Is connected in series to a power supply for operating an electromagnetic clutch that connects the power supply, a load power supply such as a defogger and a radio. Further, each of the switches is configured to be cut off when a control signal output from the control device 60 is input.

Here, when the fail-safe mode is on, the controller 60 outputs a control signal so as to turn off a predetermined sequence or all with reference to the on / off of each switch. On the other hand, when the fail safe mode is off, the control device 60 outputs a control signal to electrically connect all the switches. The predetermined order is preferably set such that the load power is shut off in the order of high engine load of the compressor of the air conditioner, the defogger, the radio, and the like.
In addition, when the load power is cut off in the above example, when no load power is cut off, the load power is first cut off to stop the compressor, and when the compressor is stopped, the defogger Turn off the power. Then, when the load power of the compressor and the defogger is cut off, the power of the radio is cut off. By doing so, the load on the engine is gradually reduced.

In the fifth embodiment, the table of flags for the cooling water temperature of the first embodiment described above is used (see Table 1).

The operation of the fifth embodiment will be described below according to the control program stored in the control device 60.

First, when the ignition key of the vehicle is turned on and the engine is started, the control routine shown in FIG. 11 is executed. When this control routine is executed, the routine proceeds to step 500, where the control program is initialized. In this initial setting, the set values t0 and t1 of the cooling water temperature are fetched and the flags F and FB are set to zero. The flag F represents the open / closed state of each of the radiator grille 22 and the front cross member 44 with respect to the currently detected cooling water temperature.
Indicates the open / closed state of each of the radiator grille 22 and the front cross member 44 with respect to the previous cooling water temperature.

When the initial setting is completed, the routine proceeds to step 502, where it is judged whether or not the ignition key is turned on. If it is on, the routine proceeds to step 510, and if it is off, the routine proceeds to step 504.

In step 504, the time after the ignition key is turned off is measured by a timer means (not shown), and it is judged whether or not a predetermined time (for example, 5 minutes) has passed. If the predetermined time has not passed To step 510. On the other hand, if the predetermined time has elapsed, step 50
In step 6, it is determined whether the flag F is 0. When the flag F is 0, the radiator grill 22 and the front cross member 44 have already been closed, so the control routine ends. If the flag F is not 0, the flag F is set to 0 and the radiator grill 22 and the front cross member 44 are closed in step 508. In this way, the on / off state of the ignition key is detected, and a predetermined time (for example, 5
Since the open / close control of the radiator grille 22 and the front cross member 44 is continued until the time elapses, the cooling effect of the cooled object during parking can be improved.

At step 510, the flag setting subroutine shown in FIG. 12 which indicates the open / closed state of the radiator grill 22 and the front cross member 44 is executed. In this flag setting subroutine, the processing from step 120 to step 130 in the control routine shown in FIG. 6 is made a flag setting subroutine. In this flag setting subroutine, a flag F indicating the open / closed state of the radiator grill 22 and the front cross member 44 is set according to the cooling water temperature. When the setting of the flag F is completed, the process proceeds to step 512. In step 512, it is determined whether the flag F is 0 or 1, and if the flag F is 0 or 1, the process proceeds to step 514. In step 514, it is determined whether or not the failsafe mode is on. If the failsafe mode is on, the process proceeds to step 516. At step 516, the fail-safe mode is turned off, the interruption of the load power supply is stopped as described above, and the routine proceeds to step 518. As described above, the control device 60 outputs a control signal to electrically connect all the switches of the switch section 80 to turn off the fail-safe mode and stop the cutoff of the load power supply. To do.

In step 518, it is determined whether or not the flag F is 2, and if the flag F is 2, the process proceeds to step 520. If the flag F is other than that, the process proceeds to step 522. Step 520 and step 522
Then, it is determined whether or not the flag F set by determining whether F = FB is the same as the previously set flag FB. If it is determined in step 522 that F = FB, it is not necessary to open and close the radiator grille 22 and the front cross member 44, so step 528
Go to.

When the set flag F is different from the previous flag FB, the routine proceeds to step 526, and the radiator grill 22 and the front cross member 44 are opened and closed according to the set flag F. When the opening / closing process of the radiator grill 22 and the front cross member 44 is completed, the process proceeds to step 528.

When it is determined in step 520 that F = FB (when the flag F is the same as the previous time), that is, when the radiator grill 22 and the front cross member 44 are both open, the engine load is still high. In step 524, the fail safe mode is turned on and the load power is cut off. When this process ends, the routine proceeds to step 528. As described above when the fail-safe mode is turned on, for example, when the load power supply is cut off in the above example, if no load power supply is cut off, the load power supply is first cut off to stop the compressor. If the compressor is stopped, the power of the defogger is cut off. Then, when the load power of the compressor and the defogger is cut off, the power of the radio is cut off.
By doing so, the load on the engine is gradually reduced.

In step 528, the radiator grill 2 is
2 and whether or not to continue the opening / closing process of the front cross member 44. In step 528, if the opening / closing process of the radiator grill 22 and the front cross member 44 is to be continued, the process proceeds to step 530, the flag F is set to the flag FB, and the process returns to step 502. In the case of ending, this control routine is ended.

As described above, if the engine cooling water temperature does not fall below the predetermined value even when the radiator grill 22 and the front cross member 44 are in the open state, the fail safe mode is turned on and the switch section 80 is turned on / off. The load on the engine is reduced by shutting off the load power supply that is not related to running. As a result, the cooling water temperature is quickly reduced. Further, the fuel consumption can be improved by reducing the engine load.

In the fifth embodiment described above, the case where the radiator grill 22 and the front cross member 44 are opened / closed according to the cooling water temperature (first embodiment) has been described, but according to the cooling water temperature and the temperature rise rate of the cooling water temperature. Also when opening and closing the radiator grille 22 and the front cross member 44 (second embodiment), step 220 of the control routine shown in FIG. 7 is replaced with the flag setting subroutine of FIG.
To 236 can be similarly adapted by using the processing of step 236.

Further, the radiator grille 22 and the front cross member 44 are based on the combination of the cooling water temperature, the temperature increase rate and the vehicle height described in the third and fourth embodiments.
When a fail-safe mode for shutting off the load power source of the present embodiment is added when controlling the opening and closing of the engine, the radiator grille 22 and the front cross 22 based on the relationship between the engine cooling water temperature and the fail-safe mode shown in Table 5 below are added. This can be easily realized by using a table indicating the flag F indicating the open / closed state of each member 44. The correspondence between the flags and the open / closed states of the radiator grille 22 and the front cross member 44 at this time is shown in Table 6 below.

[0098]

[Table 5] However, t0, t1: set value H0: set value

[0099]

[Table 6] However, X: Close ◯: Open Using Tables 5 and 6 above, the radiator grille 22 and the front cross member 44 are opened and closed (third embodiment) according to the cooling water temperature and the vehicle height, as shown in FIG. , Fig. 8
Control routine shown in step 320 to step 33
When the processes up to 8 are used in the flag setting subroutine, a process of setting the flag F to 4 is added instead of the process of setting the flag to 2 in step 300. As a result, the fail-safe mode ON state in which the switch section 80 is ON / OFF controlled is the case where the flag F is 3 or 4. Then, in step 512, the flag F is 0,
It is changed so as to judge whether it is 1, 2 or not, and it is changed so as to judge whether it is 2 or 3 in step 518, and the above processing is performed. As a result, it is possible to provide a fail-safe mode in which the load power is shut off when the radiator grill 22 and the front cross member 44 are opened and closed according to the cooling water temperature and the vehicle height, and the same effect as in the above embodiment can be obtained.

Further, when the radiator grill 22 and the front cross member 44 are opened and closed according to the cooling water temperature, the temperature rise rate of the cooling water temperature, and the vehicle height (fourth embodiment), the control shown in FIG. 9 is similarly performed. Routine step 420
When the processing from step to step 444 is used in the flag setting subroutine, the flag is set to 4 instead of the processing of setting the flag F to 2 when the determination in step 432 is negative.
Add the process to set to. As a result, the fail safe mode ON state for controlling the switch section 80 is ON when the flag F is 3 or 4. Then, similarly to the above, in step 512, the flag F is set to 0, 1,
Change to determine which of the two, step 5
The above process is performed after changing to determine whether it is 2 or 3 in 18. Thus, when the radiator grill 22 and the front cross member 44 are opened and closed according to the cooling water temperature, the temperature rise rate of the cooling water temperature, and the vehicle height, it is possible to provide a fail-safe mode in which the load power is cut off. The effect of is obtained.

As described above, the fifth embodiment can be applied to the flag setting subroutine in the control routine in any of the first to fourth embodiments. That is, the flag F indicating the open / closed state of the radiator grille 22 and the front cross member 44 can be set based on at least one of the cooling water temperature, the temperature rise rate of the cooling water temperature, and the vehicle height. Therefore, even when the radiator grill 22 and the front cross member 44 are in the open state, if the engine cooling water temperature does not drop below the predetermined value, the load power supply unrelated to traveling is cut off to prevent the engine from running. The load is reduced and the cooling water temperature is reduced. Further, the fuel consumption can be improved by reducing the load on the engine.

In the above embodiment, an example in which the engine cooling water temperature is used as the engine load condition has been described, but the present invention is not limited to this, and the engine block temperature, engine oil temperature, exhaust gas At least one of physical quantities such as air temperature, accelerator opening, and fuel injection amount may be used.

It is also possible to specify the engine load based on the relationship between the accelerator opening, the vehicle speed and the acceleration. For example, it is possible to specify that the accelerator is fully open but the vehicle speed is slow and the load is high when the vehicle is traveling on a low speed uphill, and the accelerator is fully closed but the vehicle speed is fast and the vehicle is accelerating when it is traveling downhill. it can.

Further, in the above embodiment, an example in which the front cross member is used for the second movable grill has been described, but side members may be combined to form the second movable grill as shown in FIG. ..

[0105]

As described above, according to the invention described in claim 1, since the movable grill is opened / closed according to the detected engine load condition, the engine load is gently changed without abrupt change. The effect is that you can.

According to the second aspect of the present invention, since the movable grill is opened and closed based on the detected engine load condition and the rising rate of the engine load condition, the movable grill is opened and closed in accordance with the changed state of the engine load condition. Further, there is an effect that the change of the engine load condition can be prevented early by detecting the rate of increase of the engine load condition and the movable grill can be opened and closed promptly.

According to the third aspect of the invention, since the movable grill is opened and closed according to the detected vehicle height, the movable grill is closed by closing the second movable grill of the vehicle when the vehicle height is low. There is an effect that interference with the ground can be prevented.

According to the fourth aspect of the present invention, even if the movable grill is in the open state, the engine load that interrupts the engine load is shut off when the engine cooling water temperature does not drop below the predetermined value. And the engine load condition can be brought into an appropriate state.

[Brief description of drawings]

FIG. 1 is a perspective view of a front portion of a vehicle body to which a movable grill according to an exemplary embodiment of the present invention is applied, as seen obliquely from the front of the vehicle body.

FIG. 2 is a side cross-sectional view (cross-section taken along line 2-2 of FIG. 1) showing the vicinity of a radiator grill of a front vehicle body of an automobile of one embodiment of the present invention.

FIG. 3 is a side cross-sectional view (cross-section taken along line 4-4 of FIG. 1) showing a front body structure of an automobile according to an embodiment of the present invention.

FIG. 4 is a side sectional view showing the vicinity of a front cross member of the front body structure of an automobile according to an embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of a control device used in the first embodiment.

FIG. 6 is a flowchart showing a movable grill control routine of the first embodiment.

FIG. 7 is a flowchart showing a movable grill control routine of the second embodiment.

FIG. 8 is a flow chart showing a movable grill control routine of a third embodiment.

FIG. 9 is a flowchart showing a movable grill control routine of a fourth embodiment.

FIG. 10 is a block diagram showing a configuration of a control device used in a fifth embodiment.

FIG. 11 is a flow chart showing a movable grill control routine of a fifth embodiment.

FIG. 12 is a flowchart showing an example of a flag setting subroutine of the fifth embodiment.

FIG. 13 is a flowchart showing another example of the flag setting subroutine of the fifth embodiment.

FIG. 14 is a side cross-sectional view (cross-section taken along line 5-5 of FIG. 3) showing the vicinity of a side member of a front body structure of an automobile.

[Explanation of symbols]

 10 Vehicle Body 20 Outside Air Intake 22 Radiator Grill (First Movable Grill) 44 Front Cross Member (Second Movable Grill) 58 Cooling Water Temperature Meter (Engine Load Detecting Means) 59 Vehicle Height Sensor (Vehicle Height Detecting Means) 60 Control Device (Control means) 80 switch section

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Keiji Sumitani 1 Toyota-cho, Toyota-shi, Aichi Toyota Motor Co., Ltd.

Claims (4)

[Claims] 1. A first movable grill that can be opened and closed to take in outside air from the front of the vehicle, and a second movable grill that can be opened and closed to take in outside air from below or from the side of the vehicle are controlled to be opened and closed. In a control device for a movable grill, an engine load condition detecting means for detecting an engine load condition, and as the detected engine load condition becomes larger, the second movable grill is opened and then the first movable grill is opened. A control device for a movable grill, comprising: 2. A first movable grill that can be opened and closed to take in outside air from the front of the vehicle, and a second movable grill that can be opened and closed to take in outside air from below or from the side of the vehicle are controlled to be opened and closed. In the control device for the movable grill, an engine load condition detecting means for detecting an engine load condition, an engine load condition rising rate detecting means for detecting an increasing rate of the engine load condition, and the detected engine load condition rising rate are equal to or less than a predetermined value. When the detected engine load condition increases, the second movable grill is opened and then the first movable grill is opened so that the detected engine load condition increase rate reaches a predetermined value. And a control means for controlling the first movable grill and the second movable grill to open when they exceed the limit. Control device. 3. A first movable grill that can be opened and closed to take in outside air from the front of the vehicle, and a second movable grill that can be opened and closed to take in outside air from below or from the side of the vehicle are controlled to be opened and closed. In the control device for the movable grill, an engine load condition detecting means for detecting an engine load condition, a vehicle height detecting means for detecting a vehicle height, and an engine load condition detected if the detected vehicle height is a predetermined value or more. When the detected vehicle height is lower than a predetermined value, the second movable grill is closed and the second movable grill is opened after the second movable grill is opened. A control device for the movable grill, comprising: a control unit that controls to open and close the first movable grill based on the detected engine load condition. 4. A first movable grill that can be opened and closed to take in outside air from the front of the vehicle, and a second movable grill that can be opened and closed to take in outside air from below or from the side of the vehicle are controlled to be opened and closed. In a control device for a movable grill, an engine load condition detecting means for detecting an engine load condition, and if the detected engine load condition is less than or equal to a predetermined value, the second movable condition is detected as the detected engine load condition increases. When the first movable grill is controlled to be opened after the grill is opened, the detected engine load condition exceeds a predetermined value, and the first movable grill and the second movable grill are opened. A control device for a movable grill, comprising: a control unit that cuts off an engine load that applies a load to the engine.