JPH0711954A - Draft control device for radiator for vehicle - Google Patents

Abstract

PURPOSE:To improve warming-up characteristics, to improve an output, and to improve fuel consumption by a method wherein an engine cooling water temperature and a measurement signal for the boost pressure of an engine suction system form a control parameter, by means of which an air flow and the direction of outside air passing through a radiator are controlled. CONSTITUTION:In a vehicle wherein a radiator 1 is arranged to the front of the engine room of a vehicle and the intercooler 2 of a supercharger is arranged in the engine room and facing an outside air intake port opened to a position above a bonnet, a shutter 4, being a means to effect switching so that the flow of outside air is stopped or executed or a fan is arranged in a ventilation flue for outside air passing through the radiator 1. A measurement signal for an engine cooling water temperature and a measurement signal for a boost pressure in an engine suction system are inputted from a measuring means 9 to a control means 6 for an actuator 5 to effect switching operation. Based on the two signals, the draft of outside air passing through the radiator 1 is switched and controlled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilation control device for controlling the amount of outside air passing through a radiator mounted on a vehicle. More specifically, the radiator is arranged in the front of the engine room of the vehicle and is opened on the hood. The present invention relates to a radiator ventilation control device in a vehicle in which an intercooler for a supercharger is provided in an engine room facing an outside air intake.

[0002]

2. Description of the Related Art A vehicle equipped with a supercharged engine is generally provided with a radiator for circulating and cooling engine cooling water and an intercooler for cooling intake air at the outlet of the supercharger. In these radiators and intercoolers, a radiator 11 is usually arranged in the front part of the engine room of the vehicle as shown in FIG. 5, and the radiator 11 and the intercooler are arranged inside the engine room facing the outside air intake opening on the hood of the engine room. The intercooler 12 is arranged to cool the radiator 11 by the traveling wind A introduced from the front part of the vehicle while traveling, and at the same time, cool the intercooler 12 by the traveling wind B introduced from the outside air intake on the bonnet. I am trying to.

A conventional ventilation control device for controlling the amount of air passing through a radiator is, for example, Japanese Utility Model Laid-Open No. 55-127619.
As disclosed in the prior arts such as Japanese Patent Publication No. 57-37619 and Japanese Patent Laid-Open Publication No. 57-37619, an openable shutter is provided behind the radiator to detect the water temperature of the engine cooling water, the engine temperature, etc. Closes the shutter and opens the shutter when the temperature is higher than the set value to control the air flow to the radiator.

[0004]

By the way, in the above-mentioned prior art, when the engine cooling water temperature is low, the shutter is closed to prevent the radiator from being overcooled and the warm-up time in the engine cold state is shortened. Also, although the effect of preventing overheating of the engine can be obtained by opening the shutter when the engine is hot, etc., however, in the case of the conventional technology, the shutter is set using only the temperature of the engine cooling water and the temperature of the engine as parameters. Since the opening and closing of was, there were the following problems.

That is, in the vehicle having the radiator and the intercooler in the engine room as described above, when the shutter is opened, the hot running wind passing through the radiator circulates in the engine room to remove the outside air on the bonnet. Mix with the air for cooling the intercooler flowing from the inlet. In this case, in the conventional technique in which the shutter is opened and closed depending only on the temperature such as the engine cooling water temperature or the engine temperature, the high-temperature running air that has passed through the radiator is mixed with the air for intercooler cooling after the engine is warmed up. Therefore, there is a problem in that the use of the running air to cool the intercooler is not sufficient and the expected cooling effect of the intercooler cannot be exhibited.

The present invention has been proposed to solve the above-mentioned problems. It is possible to improve the warming-up characteristics as compared with the prior art, and also improve the cooling performance of the intercooler to improve the engine output. An object of the present invention is to provide a ventilation control device for a vehicle radiator that can achieve both improvement of fuel efficiency.

[0007]

In order to achieve the above-mentioned object, the device according to the present invention has a radiator arranged at the front of the engine room of a vehicle having an outside air intake port as described above and opened on the bonnet. In a vehicle provided with an intercooler for a supercharger in the engine room facing the outside air intake, in the outside air ventilation passage that passes through the radiator,
A ventilation switching means for stopping or opening the circulation of the outside air, or stopping the circulation of the outside air, and switching between the forward and reverse directions, an actuator for performing a desired switching operation of the ventilation switching means, and a control means for outputting a switching signal to the actuator are provided. However, the control means inputs the measurement signal of the engine cooling water temperature and the measurement signal of the supercharging pressure in the engine intake system, and based on both signals, the actuator for switching the ventilation of the outside air passing through the radiator. It is characterized in that a switching signal is output to.

[0008]

In the structure according to the present invention, the measurement signal of the engine cooling water temperature and the measurement signal of the supercharging pressure in the engine intake system are input, and the ventilation of the outside air passing through the radiator is switched and controlled based on both signals. Therefore, when the engine cooling water temperature t is lower than the set water temperature t1 at the time of warm-up, the ventilation to the radiator is stopped at the cold start, and the warm-up characteristics at the engine cold state are improved.

Further, if the engine cooling water temperature t becomes higher than the set water temperature t1 at the time of warm-up and does not reach the set water temperature t2 at which the engine may overheat, the measurement signal of the supercharging pressure p is controlled. In addition to the parameters, when p is higher than the set pressure p1, the supercharger is operating. Therefore, also in this case, the ventilation to the radiator is stopped so that the hot air that has passed through the radiator causes the intercooler to cool. The inconvenience that the cooling effect of the above is obstructed is prevented.

Further, when the engine cooling water temperature t is higher than the set water temperature t2 which may cause overheating,
When the supercharging pressure p is equal to or lower than the set pressure p1, the ventilation of the radiator is started to prevent the engine from overheating. In this case, since the supercharging pressure p is equal to or lower than the set pressure p1 and the intake air temperature of the supercharging air is low, even if the high-temperature traveling air that has passed through the radiator is mixed with the air for cooling the intercooler, the cooling effect of the intercooler is adversely affected. Does not derive.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a first embodiment of the present invention,
Similar to the conventional example shown in FIG. 5, the radiator 1 is arranged in the front part of the engine room of a vehicle having an outside air intake port on the front side, and the engine is opposed to the outside air intake port opened on the hood of the engine room. A supercharger intercooler 2 is installed in the room. 3 indicates an engine,
During traveling, the radiator 1 is cooled by the traveling air A introduced from the front of the vehicle, and the intercooler 2 is cooled by the traveling air B introduced from the outside air intake opening on the hood. It has become.

An openable shutter 4 is provided as a ventilation switching means in the ventilation passage of the traveling wind passing through the radiator 1, and the opening and closing of the shutter 4 stops or opens the circulation of the traveling wind passing through the radiator 1. I am able to do it. The shutter 4 can be opened and closed by an actuator 5, and the actuator 5 is connected to a control means 6 which outputs an opening and closing signal. The control means 6 includes a cooling water temperature measuring unit 7 that measures the temperature of the engine cooling water based on the detection signal from the water temperature sensor 7a, and supercharging in the engine intake system based on the detection signal from the throttle opening sensor 8a or the pressure sensor 8b. Two measurement signals of the supercharging pressure measuring unit 8 for measuring the pressure are input, the open / close of the shutter 4 is determined according to the input values as described later, and the opening / closing command of the shutter 4 is issued to the actuator. It outputs to 5. Reference numeral 9 indicates a measuring means including two measuring units 7 and 8.

FIG. 2 is a flow chart showing the opening / closing operation of the shutter 4. The operation and its operation will be described with reference to this flow chart. In FIG. 2, t is the water temperature of the engine cooling water, t1 is the set water temperature during warm-up, t2 is the set water temperature that may cause the engine to overheat, and p is the value detected by detecting the throttle opening or the intake pipe pressure. The measured supercharging pressure in the engine intake system is shown, and p1 is the set pressure for the desired purpose.

After the engine is started, the water temperature t of the engine cooling water is measured by an input signal from the measuring section 7 in step S1, and when t is lower than t1 (set water temperature during warm-up), the shutter 4 is opened in step S4. Is closed and ventilation to the radiator 1 is stopped. As a result, the radiator 1 is prevented from being overcooled, and the warm-up characteristics of the engine are promoted.

If t is higher than t1 (set water temperature during warm-up) at step S1, it is further measured and compared with t2 (set water temperature at which engine may overheat) at step S2, and t1 ≤t If ≤t2 is YES, the process proceeds to step S3, and the supercharging pressure p is measured by the input signal from the measuring unit 8. If p is higher than p1 (set pressure), the shutter 4 is closed in step S4. In this case, since the supercharger is operating and the supercharging pressure p is higher than the set pressure p1, it is necessary to cool the intake air at the outlet of the supercharger. At this time, the shutter 4 is closed to the radiator 1. Since the ventilation of the air is stopped, it is possible to prevent inconvenience that the high-temperature traveling air that has passed through the radiator 1 mixes with the cooling air of the intercooler 2 and impairs the cooling performance of the intercooler 2.

In step S2, t1≤t≤
If t2 is NO, t is higher than t2 (set water temperature at which the engine may overheat), so the shutter 4 is opened in step S5. This prevents overheating of the engine.

If p is lower than p1 (set pressure) in step S3, the shutter 4 is opened in step S5. At this time, since the supercharging pressure p in the engine intake system is low and the cooling effect of the intercooler 2 is also effective, the high-temperature running air that has passed through the radiator 1 by opening the shutter 4 becomes the cooling air of the intercooler 2. Even if mixed, the cooling performance of the intercooler 2 is not adversely affected.

FIG. 3 is a block diagram showing a second embodiment of the present invention. In contrast to the embodiment shown in FIG. 1 of the previous example, in this embodiment, a radiator is used as a ventilation switching means for the traveling wind passing through the radiator 1. The fan 4a is used, and the fan 4a
The configuration is such that running air ventilation switching function is achieved by stopping, rotating forward and backward. Also in this embodiment, the fan 4a is designed to be switched between stop, forward rotation and reverse rotation by the actuator 5 as in the previous example, and the actuator 5 is connected to the control means 6 for outputting a switching signal. As in the case of the previous example, the control means 6 is also provided with the two measurement signals of the engine cooling water temperature measuring unit 7 and the supercharging pressure measuring unit 8, and the fan 4a will be described later based on the input values. The switching operation is performed according to the flowchart shown in FIG.

The operation of this embodiment will be described with reference to the flow chart of FIG. 4. In step S1 after the engine is started, the water temperature t of the engine cooling water is measured by an input signal from the measuring section 7, and t is the set water temperature t3. If it is higher, the fan 4a is normally rotated in step S3 to ventilate the radiator 1 to lower the cooling water temperature.

In step S1, t is the set water temperature t3.
In the following cases, the process proceeds to step S2, the supercharging pressure p is measured by the input signal from the measuring unit 8, and if p is higher than the set pressure p1, the fan 4a is reversed in step S4. This prevents running wind from flowing into the engine room.

If p is less than or equal to the set pressure p1 in step S2, the fan 4a is stopped in step S5, and after the fan 4a is stopped, the water temperature t of the engine cooling water is measured in step S1. When it gets higher,
Immediately in step S3, the fan 4a is normally rotated to ventilate the radiator 1 to lower the cooling water temperature.

It is to be noted that this embodiment is disadvantageous in that the warm-up characteristics cannot be expected to be greatly improved and that the electric power load of the radiator fan 4a is increased, as compared with the shutter-type embodiment shown in FIG. , Without adding a shutter
It is advantageous that it can be dealt with by improving the production vehicle system.

[0023]

As described above, according to the present invention, the temperature of the engine cooling water and the pipe pressure of the supercharging pressure in the engine intake system are measured, and the outside air passing through the radiator is measured based on the both measurement signals. Since the configuration is such that switching control is performed so as to stop and open the ventilation amount, it is possible to improve the warm-up characteristics, the engine output, the fuel consumption characteristics, etc., as compared with the prior art. That is, when the temperature of the cooling water is low, such as when the engine is in a cold state, the radiator does not ventilate, so the temperature of the cooling water rises faster than before and the warm-up characteristics can be greatly improved. Further, along with this, it is possible to obtain the effect that the handedness of the heater is increased.

Further, when the measurement signal of the supercharging pressure in the engine intake system is added to the control parameter and the temperature at which the engine does not overheat is not reached, the ventilation to the radiator is stopped according to the supercharging pressure, whereby the radiator is stopped. Since the cooling effect of the intercooler is prevented from being hindered by the high-temperature running air that has passed through the engine, the cooling effect of the intercooler is enhanced compared to the conventional technology, and the engine output is improved by improving the cooling effect of the intercooler. It is possible to improve fuel efficiency characteristics.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a first embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the above embodiment.

FIG. 3 is a configuration diagram showing another second embodiment of the present invention.

FIG. 4 is a flowchart showing the operation of the above embodiment.

FIG. 5 is a cross-sectional view showing an arrangement of a radiator and an intercooler of an automobile.

[Explanation of symbols]

 1 radiator 2 intercooler 3 engine 4 shutter 4a radiator fan 5 actuator 6 control means 7 cooling water temperature measuring unit 8 supercharging pressure measuring unit

Claims (3)

[Claims] 1. A vehicle in which a radiator is arranged in a front portion of an engine room of a vehicle having an outside air intake port, and an intercooler for a supercharger is provided in the engine room so as to face the outside air intake port opened on a hood. A ventilation switching means for stopping, opening, or stopping the circulation of the outside air, switching to the forward and reverse directions, and an actuator for switching the ventilation switching means as necessary in an outside air ventilation path passing through the radiator; And a control means for outputting a switching signal to the engine.The control means inputs the measurement signal of the engine cooling water temperature and the measurement signal of the supercharging pressure in the engine intake system, and passes the radiator based on both signals. Ventilation control for a vehicle radiator characterized by outputting a switching signal to an actuator so as to control the ventilation of the outside air Location. 2. The ventilation control device for a vehicle radiator according to claim 1, wherein the ventilation switching means is configured to switch by opening and closing a shutter. 3. The ventilation control device for a vehicle radiator according to claim 1, wherein the ventilation switching means is configured to be switched by normal rotation, stop, and reverse rotation of a radiator fan.