JPS6327204B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cooling device for cooling an engine cooling water radiator and a condenser of a cooler cycle using two electric blowers in an automobile equipped with a cooler.

Conventionally, in this type of automobile with a cooler, in addition to the blower that is constantly driven by the engine, an electric blower is installed separately, and this electric blower is connected to both the water temperature detector and the condenser cooling state detector. It was known that the operation was controlled based on signals (Utility Model Publication No. 1772/1972). However, in this conventional device, the blower driven by the engine always rotates regardless of the operating state of the cooler cycle. Therefore, the cooler cycle is not used and the blower is rotated until the engine cooling water temperature is relatively low, which is disadvantageous in terms of noise, fuel consumption, etc.

The present invention was devised in view of the above-mentioned points, and is used in an automobile equipped with a cooler in which a radiator for cooling engine cooling water and a condenser for condensing refrigerant in the cooler cycle are arranged in series. In addition, the purpose is to control the operation of these two electric blowers in the most efficient manner so as not to unnecessarily lengthen the operating time of the two electric blowers.

Therefore, in the present invention, when the cooler cycle is stopped, both electric blowers are controlled solely by the engine cooling water temperature.
The system is controlled in three ways: operating only one electric blower and operating both electric blowers. Also, when the cooler cycle is activated, it is controlled not only by the engine cooling water temperature but also by a signal corresponding to the cooling state of the condenser. , a configuration is adopted in which the above three types of control are performed.

That is, according to the present invention, neither of the two electric blowers is operated when the cooler cycle is not used, such as during winter, and when the engine coolant temperature is low. Similarly, even when the cooler cycle is not in use, if the engine coolant temperature rises above the set temperature, one electric blower can be activated to reduce the engine coolant temperature, causing the engine coolant temperature to rise further. In this case, the engine cooling water temperature can be most efficiently reduced by using both electric blowers.

However, according to the present invention, the electric blower is controlled based on the engine cooling water temperature not only when the cooler cycle is stopped. The above control is also possible during operation of the cooler cycle.

Moreover, when the cooler cycle is in operation, both electric blowers can be operated most efficiently by a signal from a condenser cooling state detector that detects the cooling state of the condenser. That is, when the signal from the condenser cooling state detector does not indicate a lack of condenser cooling capacity, either one of the two electric blowers or both electric blowers can be inactivated, and the condenser cooling state detection Both electric blowers can be activated only when the device detects a lack of condenser cooling capacity.

Therefore, according to the present invention, it is possible to operate the electric blower mainly when necessary based on a signal from the engine cooling water temperature condition and a signal from the condenser cooling state detector. Problems such as noise, power consumption (battery consumption), and fuel consumption caused by this can be solved. In other words, it has the excellent effect of reducing noise, improving fuel efficiency, and eliminating battery consumption throughout the season.At the same time, it also improves its cooling capacity, which is its original function, by preventing insufficient engine cooling and condensation. The effect is that there is no problem in that the cooling of the container is not insufficient.

The present invention will be described below with reference to embodiments shown in the drawings.

FIG. 1 shows the arrangement of the device of the present invention.
1 is a water-cooled engine of an automobile, 2 is a radiator for cooling the cooling water of this engine 1, and 3 is a condenser arranged in series on the front side of this radiator 2, which condenses the refrigerant of the cooler cycle. It is. A high-temperature, high-pressure refrigerant gas is introduced into the condenser 3 from a compressor (not shown) driven by the automobile engine 1.

4 and 5 are two electric blowers attached in parallel to the radiator 2, each having a motor 4a and 5a,
It is composed of fans 4b, 5b and shrouds 4c, 5c.

FIG. 2 shows an electric circuit according to a first embodiment of the present invention, in which 6 includes an automobile power battery, 7 an ignition switch of the automobile engine 1, and 8 the condenser 3, compressor, etc. This is a switch that indicates the open/close state corresponding to the stoppage of operation of the cooler cycle. It opens when the cooler cycle is stopped and closes when the cooler cycle is operating. Specifically, this switch is a manually operated cooler switch that stops the operation of the cooler cycle, or a switch that operates in conjunction with this cooler switch.

A relay 9 is controlled by the switch 8, and is composed of a coil 9a and a normally open contact 9b. 1
0 is a first water temperature detector that detects the engine coolant temperature, and is closed when the engine coolant temperature rises to a first set temperature (for example, 95° C.) or higher. 13 is a second switch connected in parallel with switch 8.
A second set temperature (e.g. 105°C) where the engine cooling water temperature is higher than the first set temperature.
If it rises above this level, it will close.

11 is a condenser cooling state detector, which in this example is composed of a pressure switch that detects the high pressure of the cooler cycle, and closes when the high pressure side pressure rises above the set pressure (for example, 20 to 30 Kg/cm ² ). It is something that can be achieved. 12 is a coil 12a and a normally open contact 12b
The condenser cooling state detector 11 is connected in parallel with the normally open contact 12b of this relay 12.

The operation in the above configuration will be explained. When the cooler cycle is stopped, the switch 8 is in the open state, so the coil is energized only when the second water temperature sensor 13 is closed, the normally open contact is closed, and the motor 5
A is energized. That is, the motor 5a operates only when the second water temperature detector is closed.

On the other hand, when the engine coolant temperature rises to the first set temperature, the water temperature detector 10 closes and the relay 1
2 operates, the normally open contact 12b closes, and the motor 4
A is energized. As a result, one electric blower 4
operates and blows air to the radiator 2.

Therefore, when the cooler cycle is stopped, both electric blowers do not operate when the engine cooling water temperature is below the first set temperature. Then, when the temperature rises above the first set temperature, only one electric blower 4 is activated. In particular, when the cooler cycle is stopped, the condenser 3 does not radiate heat, so one electric blower 4
The heat radiator 2 can be sufficiently cooled simply by operating the radiator 2. Furthermore, even when the cooler cycle is stopped, if the engine cooling water temperature rises abnormally and exceeds the second set temperature, the other electric blower 5 will also operate, and both electric blowers 4 and 5 will cool the engine. Therefore, cooling of the heat radiator 2 is ensured.

Next, since the switch 8 is closed when the cooler is in operation, the normally open contact 9b of the relay 9 is closed and the motor 5a is energized. Therefore, one electric blower 5 is always operated, and this electric blower 5
The radiator 2 and the condenser 3 are cooled by the operation of the radiator 2 and the condenser 3.

However, when the vehicle is running at medium to low speeds of 40 to 60 km/h or less, the cooling air volume decreases, resulting in insufficient cooling of the condenser 3. pressure) increases. When this high pressure side pressure rises to a set value, the detector 11 is closed and the normally open contact 12b of the relay 12 is closed, so that the motor 4a is also energized. As a result, in addition to the electric blower 5, the electric blower 4 also operates at the same time, and the amount of cooling air increases, so that insufficient cooling of the condenser 3 is resolved.

Furthermore, when the vehicle is running at high speed or when the outside temperature is low, the cooling capacity of the condenser 3 increases, so the pressure on the high pressure side decreases below the set value, and the detector 11 becomes open. Therefore, in this state, the operation of the electric blower 4 is intermittent only by the water temperature detector 10.

FIG. 3 shows a second embodiment of the present invention, in which a switch 11' is provided in series with the switch 8 and interlocks with the detector 11, so that even when the cooler is operating, there is sufficient margin in the condenser cooling capacity as when driving at high speed. If there is,
When the switch 11' is opened, the electric blower 5 is also stopped.

In each of the above-mentioned embodiments, the condenser cooling state detector 11 was described as one that detects the high-pressure side pressure, but it is also possible to detect the high-pressure side refrigerant temperature that has a correlation with the high-pressure side pressure. Of course. Furthermore, a switching circuit that detects the vehicle speed or engine rotational speed when the cooler is in operation can also be used as the detector 11.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the arrangement of the apparatus of the present invention, and the electric blower section is shown in cross-section. FIG. 2 is an electric circuit diagram showing a first embodiment of the device of the present invention, and FIG. 3 is an electric circuit diagram showing a second embodiment of the device of the present invention. 1...Engine, 2...Radiator, 3...Condenser, 4, 5...Electric blower, 4a, 5a...Motor, 10, 13...Water temperature detector, 11...Condenser cooling state detector .

Claims (1)

[Claims] 1 In a car with a cooler, a radiator that cools the engine cooling water and a condenser that condenses the refrigerant of the cooler cycle are arranged in series, and the radiator and condenser are cooled by two electric blowers. a first water temperature detector that detects a first set temperature of the engine cooling water; a second water temperature detector that detects a second set temperature of the engine cooling water that is higher than the first set temperature of the engine cooling water; a condenser cooling state detector for detecting a state, and when the cooler cycle is stopped, only one of the two electric blowers is operated according to a signal from the first water temperature detector, and the first and second electric blowers are operated.
Both of the electric blowers are operated according to a signal from a water temperature detector, and when a cooler cycle is operated, only one or both of the electric blowers are operated according to the operation of the water temperature detector and the condenser cooling state detector. A cooling device for a radiator and a condenser of an automobile equipped with a cooler.