JPS6346245B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shutter device for a radiator of a vehicle or other vehicle.

Radiators are originally installed to prevent the engine from overheating, but when the atmospheric temperature is low, such as in cold regions, radiators can sometimes prevent the cooling water from rising in temperature, causing overcooling and reducing the heating effect. There was a problem. In addition, in recent years, improvements in combustion methods have increased the thermal efficiency of engines, resulting in improved fuel efficiency, but on the other hand, the temperature of the cooling water has tended to not rise, making overcooling more likely. Furthermore, although it is the fate of internal combustion engines to supply an extremely rich air-fuel mixture from when the engine starts when it is cold until it warms up, it is a serious problem that is undesirable from the point of view of improving fuel efficiency. It was hot. In addition, vehicle noise has become a problem as a form of pollution, and countermeasures to this problem include applying soundproof seals and adopting airtight structures in the engine room and vehicle interior, but it is absolutely necessary for radiators to introduce atmospheric air. It was not allowed to seal the engine room beyond a certain point, and as a result, there were no effective measures against the leakage of noise from the radiator into the engine room.

In view of the above problems, the present invention provides a shutter that is disposed on the front or rear surface of a radiator and is opened and closed by an actuator,
an actuator control mechanism that operates the actuator in a shutter closing direction and a shutter opening direction, respectively; and a temperature sensor that detects cooling water temperature;
It is equipped with a rotation sensor that detects the number of rotations, a potentiometer that detects the amount of accelerator pedal depression, and an idle switch that detects the switching between idling and driving conditions in the transmission.Based on these outputs, The actuator control mechanism is activated during overcooling or sudden acceleration.
By comprising a control circuit that turns on the actuator control mechanism and turns off the actuator control mechanism during overheating and steady driving, the heating effect can be improved.
Shorten warm-up time, improve fuel efficiency, shorten warm-up time,
The purpose is to provide a radiator shutter device that achieves improved fuel efficiency and reduced noise.This will be explained below based on an example shown in the drawings.In FIG. 1, 1 is a rectangular frame, and 2 is a rectangular frame. A pair of left and right vertical frames are fixed in the frame 1 (only one is shown in the drawing); 3 is a pair of vertical frames 2 and 2; a pair of upper and lower horizontal frames is fixed between 2; 4 is a frame along the vertical frame 2; The operating rod 5 is movably arranged with the two pins 5a provided at one end being the vertical frame 2, and the operating rod 4 having one pin 5a (not shown) provided at the other end being the vertical frame. 2, a plurality of parallel vanes are pivotally supported between the vertical frames 2 and 2 and on the operating rod 4, and are opened and closed by the movement of the operating rod 4, and a seal 5b is attached to one edge. These constitute a shutter 6, which is disposed on the front (see FIG. 2) or rear surface of the vehicle radiator 7. 8 is fixed to the frame 1 and connected to a positive pressure source (not shown) via a pair of positive pressure introduction passages 9, and the operating direction is changed by switching the positive pressure introduction passage 9 by a shutter control valve to be described later. A pressurized actuator 10 that moves the operating rod 4 up and down, that is, opens and closes the vane 5, is provided in the middle of the positive pressure introduction path 9, and opens the positive pressure introduction path 9 to the actuator 8 by ON/OFF operation. This is an actuator control valve consisting of an electromagnetic four-way valve that can be switched, and operates the actuator 8 in the shutter closing direction and the shutter opening direction when turned on and off, respectively. In addition, 11 is an engine, 12 is a cooling water passage, 13 is a water pump, and 14 is a thermostat.

FIG. 3 is a block diagram of a control circuit for controlling the actuator control valve 10, in which 15 is a temperature sensor installed in the cooling water passage 12 to detect the cooling water temperature, and 16 is a temperature sensor installed in the engine 11. Rotation sensor that detects the engine rotation speed, 1
7 is a potentiometer that is attached to the accelerator (not shown) and detects the amount of accelerator depression; 1;
8 is an idle switch that is attached to a transmission (not shown) and detects the switching between idling and running conditions and turns ON when the idling state is in effect, that is, the output becomes "H"; 19 is the output T of the temperature sensor 15 (corresponding to the detected temperature); a high temperature comparator, which compares the output T ₃ corresponding to a predetermined upper limit temperature (the boundary temperature of overheating or not) and outputs "H" when T<T ₃ ; is the output T ₁ corresponding to the output T of the temperature sensor 15 and a predetermined lower limit temperature (boundary temperature of whether or not it is in a low temperature state)
A low temperature comparator 21 outputs "H" when T< _T1 by comparing the output T of the temperature sensor 15 with an output _T2 corresponding to a predetermined medium temperature (standard engine temperature). Compare and if T<T ₂ , the output is “H”
The medium temperature comparator 22 is the output N of the rotation sensor 16 (corresponding to the detected rotation speed) and the predetermined reference rotation speed (boundary rotation speed for high rotation or not).
The output of the first comparator 23 becomes "H" when N>N ₁ , and the output of the medium temperature comparator 21 and the first comparator 22 are both "H".
24 is an AND circuit that determines overcooling and outputs "H" when
A differentiator 25 that calculates dp/dt compares the output dp/dt of the differentiator 24 with the output p corresponding to a predetermined standard increase rate (boundary increase rate between acceleration and non-acceleration). A second comparator whose output becomes "H" in the case of p', 26 a delay timer whose output becomes "H" for a predetermined period of time when the output of the second comparator 25 becomes "H", and 27 a low temperature Comparator 20, AND circuit 2
3. An OR circuit whose output becomes "H" when the output of at least one of the delay timer 26 and the idle switch 18 is "H"; 28 is a high temperature comparator 1;
When the output of 9 and the OR circuit 27 is "H", the output becomes "H" and the actuator control valve 10 is turned ON.
This is an AND circuit (see Figure 2).

Since the radiator shutter device according to the present invention is constructed as described above, at low temperatures,
Since the output T of the temperature sensor 15 becomes T<T ₁ , the output of the low temperature comparator 20 becomes "H", and as a result, the output of the OR circuit 27 becomes "H". Also, since T< _T3 , the output of the high temperature comparator 15 also becomes "H". Therefore, since the output of the AND circuit 28 becomes "H", the actuator control valve 10 becomes "H".
As a result, the shutter 6 is closed, preventing a drop in engine temperature, improving startability and shortening warm-up time, thereby significantly improving fuel efficiency. During idling, the output of the idle switch 18 becomes "H", and as a result, the output of the OR circuit 27 becomes "H". Further, during normal idling, T<T ₃ holds, so the output of the high temperature comparator 15 becomes "H". Therefore,
Since the shutter 6 is closed in the same way as when the temperature is low, leakage of noise in the engine room to the outside of the radiator 7 is effectively prevented. During normal driving,
Since the output T of the temperature sensor 15 is _T2 <T< _T3 , only the output of the high temperature comparator 19 becomes "H", and the outputs of the low temperature comparator 20 and the medium temperature comparator 21 are Both are "L". Also, since the output N of the rotation sensor 16 is N<N ₁ , the output of the first comparator 22 is also "L", and the output dp/dt of the differentiator 24 is dp/dt<P', so the second comparison is The output of the switch 25 also becomes "L", and the idle switch 1
8 is turned OFF, its output also becomes "L".
Therefore, since the output of the OR circuit 27 becomes "L", the output of the AND circuit 28 becomes "L", and as a result, the actuator control valve 10 is turned off and the shutter 6 is opened, so that the engine temperature is maintained at an appropriate temperature.
Overcooling is likely to occur when the engine brake is applied and the engine is moving at high speed.At this time, the output T of the temperature sensor 15 becomes T< _T2 , and the output of the intermediate temperature comparator 21 becomes "H". When the output N of the rotation sensor 16 becomes N>N ₁ , the output of the first comparator 22 becomes "H", and as a result, the output of the AND circuit 23 becomes "H". Also, since T< _T3 , the output of the high temperature comparator 15 also becomes "H". Therefore, since the output of the AND circuit 28 becomes "H", the actuator control valve 10 is turned on, and as a result, the shutter 6 is closed, thereby preventing overcooling and improving the heating effect. During sudden acceleration, the differentiator 24
Since the output dp/dt becomes dp/dt>P', the output of the second comparator 25 becomes "H", and as a result, the delay timer 26 outputs "H" for a predetermined period of time to match the timing of noise generation during sudden acceleration. Therefore, the output of the OR circuit 27 becomes "H". Also, since it is normal that T< _T3 at this time, the output of the high temperature comparator 15 becomes "H". Therefore, since the AND circuit 28 becomes "H" for a predetermined time, the actuator control valve 10 is turned on, and as a result, the shutter 6 is closed for a predetermined time, effectively preventing the noise in the engine room from leaking to the outside of the radiator 7. is prevented. At the time of overheating, the output T of the temperature sensor 15 becomes T>T ₃ , so the output of the high temperature comparator 19 becomes "L". Therefore, even if the output of other circuits is "H", the AND circuit 28
The output becomes "L", and as a result, the actuator control valve 10 is turned off and the shutter 6 is opened, thereby preventing overheating.

A block diagram of the control circuit of another embodiment of FIG. 4 is shown, which shows the rate of increase in the amount of accelerator depression.
Considering that even if dp/dt is large, sudden acceleration will not occur when the load is large, etc., when determining whether there is sudden acceleration or not, detect the rotational increase rate and combine this information with the information from the potentiometer. It was designed to be synthesized. In this block diagram, 29 is a first analog switch that turns ON when the output of the second comparator 25 is "H" and transmits the output N of the rotation sensor 16, and 30 is a first analog switch that differentiates the output N to increase the rotation speed. Another differentiator 31 that calculates the rate dN/dt compares the output dN/dt of the differentiator 30 with the output N corresponding to a predetermined reference rate of increase (boundary rate of increase for whether or not it is sudden acceleration). A third comparator whose output becomes "H" when dN/dt>N', and 32, which becomes ON when the output of the third comparator is "H", sets the initial value of the output N ₁
33 is the initial value
34 is an adder that adds the initial value N ₁ and a predetermined change comparison value ΔN 1; 35 is a data memory that stores N ₁ , and 35 is an adder that adds the initial value N ₁ and a predetermined change comparison value ΔN 1; A first delay timer whose output is "H" during time D ₁ , 36 a third analog switch that turns ON and transmits the output N when the output of the delay timer 35 is "H", 37 the output N to the adder 34 The fourth comparator 38 outputs "H" when the output of N ₁ +ΔN ₁ becomes "H", and the output becomes "H" for a predetermined time D ₂ when the output of the fourth comparator 37 becomes "H". This is the second delay timer.

Since this embodiment is configured as described above,
As shown in FIG. 5a, if sudden acceleration occurs when the output of the potentiometer 17 corresponding to the amount of accelerator depression is _P1 , then the output of the differentiator 24
Since dp/dt becomes dp/dt>P', the second comparator 25
As a result, the first analog switch 29 is turned on and the output N of the rotation sensor 16 is transmitted to the second differentiation circuit 30. and,
If the output dN/dt of the second differentiating circuit 30 is dN/dt>N', the output of the third comparator 31 becomes "H", and as a result, the second analog switch 32 turns ON and the initial value of the output N N ₁ is temporarily stored in the data memory 33, and then the change comparison value ΔN ₁ is added in the adder 34, resulting in the output N+ΔN ₁ . On the other hand, when the output of the third comparator 31 becomes "H", the output of the first delay timer 35 becomes "H" for a predetermined time _D1 ,
As a result, the third analog switch 36 changes to a predetermined time.
It is ON during _D1 and transmits the output N. Therefore,
In the fourth comparator 37, the output N and the output N ₂ +
A comparison of ΔN ₁ is made and N
>N ₁ +ΔN ₁ , it is determined that there is a sudden acceleration, and the output of the fourth comparator 37 becomes "H". Thus, the output of the second delay timer 38 remains "H" for the predetermined time _D2 .
Therefore, the output of the OR circuit 27 also becomes "H" for the same seconds. Also, since it is normal that T< _T3 at this time, the output of the high temperature comparator 15 becomes "H". Therefore, the AND circuit 28 becomes "H" during the predetermined time _D2 , and the actuator control valve 10 is activated.
As a result, the shutter 6 is closed for a predetermined time _D2 as shown in Fig. 5d, effectively preventing the noise inside the engine room (Fig. 5c) from leaking to the outside of the radiator 7. Ru.

Note that, unlike the above embodiments, as shown in FIG. 6, the actuator 8 is of a negative pressure type and is connected to a negative pressure source (not shown) via a single negative pressure introduction path 9'.
Turn the actuator control valve 10 into a three-way valve and turn it on.
The OFF operation switches between negative pressure and atmospheric air to be introduced into the negative pressure introduction path 9', and creates a movement behavior between the frame 1 of the shutter 6 and the operating rod 4 in the direction of opening the vane 5 on the operating rod 4. A spring (not shown) may be applied. Further, instead of the actuator 8, an air cylinder, a hydraulic cylinder, a servo motor, etc. may be used.

As described above, the radiator shutter device according to the present invention has important practical advantages in that it can improve heating effects, shorten warm-up time, improve fuel efficiency, and reduce noise.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a shutter in an embodiment of a radiator shutter device according to the present invention, FIG. 2 is a schematic cross-sectional view showing the configuration of the shutter drive section of the above embodiment, and FIG. 3 is a control circuit of the above embodiment. FIG. 4 is a block diagram of a control circuit of another embodiment, FIG. 5 is a graph showing the operating principle of the above other embodiment during sudden acceleration, and FIG. 6 is another configuration of the shutter drive section. FIG. 6... Shutter, 7... Vehicle radiator, 8
...actuator, 9...positive pressure introduction path, 10...
... Actuator control valve, 15 ... Temperature sensor, 16 ... Rotation sensor, 17 ... Potentiometer, 18 ... Idle switch, 19 ... High temperature comparator, 20 ... Low temperature comparator, 21 ... Middle temperature comparator, 22... first comparator, 23... AND circuit, 24... differentiator, 25... second comparator,
26...Delay timer, 27...OR circuit, 28
...AND circuit.

Claims (1)

[Scope of Claims] 1. A shutter that is disposed on the front or rear surface of the radiator and is opened and closed by an actuator, an actuator control mechanism that operates the actuator in the shutter closing direction and the shutter opening direction when ON and OFF, respectively, and a cooling system. It is equipped with a temperature sensor that detects the water temperature, a rotation sensor that detects the engine speed, a potentiometer that detects the amount of accelerator pedal depression, and an idle switch that detects the switching between idling and driving conditions in the transmission. A radiator shutter device comprising a control circuit that turns on the actuator control mechanism at low temperatures, idling, overcooling, or sudden acceleration, and turns off the actuator control mechanism when overheating or steady driving. 2. The radiator shutter device according to claim 1, wherein whether or not there is sudden acceleration is determined based on information from a potentiometer. 3. The radiator shutter device according to claim 1, wherein whether or not there is sudden acceleration is determined by combining information from a potentiometer and information from a rotation sensor. 4. The shutter device for a radiator according to claim 2 or 3, wherein the shutter is opened by turning off the actuator control mechanism regardless of the presence or absence of output from other circuits when overheating occurs.