JPH08210190A - Temperature control device of engine - Google Patents

Abstract

PURPOSE: To prevent an increase in power consumption of a battery caused by piling of electric load of a carburetor heater and electric load of an air- cooling fan motor. CONSTITUTION: A temperature control device of an engine comprisee a carburetor heater 11 for heating a carburetor and keeping warm if the atmospheric temperature is +5 deg.C or less, and a fan motor 12 for driving a cooling fan to air-cool engine cooling water if the engine cooling water is +90 deg.C or more. Further the device comprises a B-contact relay 15 for switching off the carburetor heater 11 no matter whether the atmospheric temperature is +5 deg.C or less or not when the fan motor 12 is operated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature control device for controlling the temperature of engine cooling water and the temperature of a carburetor.

[0002]

2. Description of the Related Art Conventionally, as a temperature control device for an engine,
It is known that the engine cooling water is cooled with air and the carburetor is kept warm and heated.

FIG. 2 is an electric circuit diagram schematically showing an example of the circuit configuration of this type of temperature control device.

As shown in the figure, the carburetor heater 21 has one end connected to the power supply line 25 and the other end grounded via the switch 23. The fan motor 22 has one end connected to the power supply line 25 and the other end grounded via the switch 24.

The carburetor heater 21 is a heater used to prevent icing of a carburetor (not shown) and is mounted on a carburetor body (not shown).

The fan motor 22 is a motor for driving a cooling fan (not shown). The cooling fan is used for air cooling the cooling water of the engine (not shown) when the temperature of the cooling water rises. This can prevent the engine from overheating.

A thermo switch is used as the switch 23 for the carburetor heater. The thermo switch 23 is closed to operate the carburetor heater 21 when the atmospheric temperature is + 5 ° C. or less, for example.

Similarly, a switch 24 for the fan motor
Also, a thermo switch is used. This thermo switch 24 has a cooling water temperature of + 90 ° C., for example.
In the above case, the fan motor 22 is closed to operate.

In such a device, since the thermo switch 23 for the carburetor heater needs to detect the atmospheric temperature, it is normally located at a position where it is not affected by the heat generated by the engine (for example, the center of the vehicle body). ) Is installed. On the other hand, the fan / motor switch 24 is usually installed in the passage of the cooling water for detecting the temperature of the cooling water for the engine.

[0010]

As described above, since the thermo switch 23 for the carburetor heater and the switch 24 for the fan motor are installed apart from each other, both thermo switches 23 are installed. , 24 may close at the same time. For example, when the engine is idling for a long time during cold weather, the temperature of the cooling water may be + 90 ° C or higher even though the atmospheric temperature is + 5 ° C or lower.

However, in this way both thermos
When the switches 23 and 24 are closed at the same time, the carburetor heater 21 and the fan motor 22 are operated at the same time, so that the electric load is overlapped and the power consumption of the battery becomes very large.

Therefore, the conventional temperature control device as shown in FIG. 2 has a drawback that the battery tends to run out when the engine is idling for a long time during cold weather.

The present invention has been made in view of the above-mentioned drawbacks of the prior art, and provides an engine temperature control device capable of preventing an increase in power consumption of a battery due to overlapping electric loads. With the goal.

[0014]

A temperature controller for an engine according to the present invention comprises a carburetor heater for keeping a carburetor warm when the atmospheric temperature is below a first predetermined temperature, and an engine cooling water. In a temperature control device for an engine including a fan motor for driving a cooling fan to cool the engine cooling water by air when the temperature is equal to or higher than a predetermined temperature of 2, when the fan motor is operating, And a control means for turning off the carburetor heater regardless of whether the atmospheric temperature is equal to or lower than the first predetermined temperature.

[0015]

According to the present invention, the carburetor heater is turned off by the control means when the fan motor is operating regardless of whether the atmospheric temperature is the first predetermined temperature or lower. Therefore, the fan motor and the carburetor heater do not operate at the same time. Therefore, since the electric loads do not overlap, there is no fear that the power consumption of the battery will increase.

[0016]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an electric circuit diagram schematically showing a circuit configuration of a temperature control device according to this embodiment.

As shown in the figure, the carburetor heater 11 has a switch portion 15a of a B contact relay 15 at one end.
Is connected to the power supply line 16 via, and the other end is grounded via the thermo switch 13. The fan motor 12 has one end connected to the power supply line 16 and the other end grounded via the thermo switch 14.

The carburetor heater 11 is mounted on the carburetor body (not shown) as in the case of FIG.

The fan motor 12 is connected to a cooling fan (not shown), not shown, for driving the cooling fan.

The thermo switch 13 for the carburetor heater is installed at a position where it is not affected by the heat generated by the engine, such as in the center of the vehicle body, and the ambient temperature is the first.
When the temperature is lower than a predetermined temperature (+ 5 ° C. in this embodiment), the carburetor heater 11 is operated.

Thermo switch 14 for fan motor
Is installed, for example, in the passage of engine cooling water, and closes and operates the fan motor 12 when the cooling water temperature is equal to or higher than the second predetermined temperature (+ 90 ° C. in this embodiment).

In the B-contact relay (corresponding to the "control means" of the present invention) 15, the switch portion 15a is arranged between the power supply line 16 and the carburetor / heater 11, and the coil portion 15b, as described above. Power line 16 at one end
And the other end is grounded via the thermo switch 14. As a result, this B contact relay 1
When the thermo switch 14 is closed, a current flows through the coil portion 15b, so that
a is in an open state. On the other hand, when the thermo switch 14 is open, no current flows through the coil portion 15b, so that the switch portion 15a is closed.

Next, the operation of the temperature control device shown in FIG. 1 will be described.

First, when the atmospheric temperature is higher than + 5 ° C. and the cooling water temperature is lower than + 90 ° C., the thermo switch 1
3,14 open. Further, since the thermo switch 14 is open, the switch section 15a of the B contact relay 15 is
Closes. As a result, no current flows through the carburetor heater 11, so that the carburetor (not shown) is not heated. Similarly, the fan motor 12 does not operate because it is not supplied with current.

When the atmospheric temperature is + 5 ° C. or lower and the cooling water temperature is lower than + 90 ° C., the thermo switch 13 is closed and the thermo switch 14 is opened. Further, when the thermo switch 14 is opened, the switch portion 15a of the B contact relay 15 is closed. Therefore, an electric current flows through the carburetor heater 11 to heat the carburetor. On the other hand, since the thermo switch 14 is open,
The motor 12 is not supplied with current and therefore this fan motor 12 does not run.

When the atmospheric temperature is higher than + 5 ° C. and the water temperature of the cooling water is + 90 ° C. or higher, the thermo switch 13 is opened and the thermo switch 14 is closed. Further, when the thermo switch 14 is closed, the switch portion 15a of the B contact relay 15 is opened. Therefore, the carburetor heater 11 is not heated because no current flows through it, but the fan motor 12 operates because current is supplied.

When the atmospheric temperature is + 5 ° C. or lower and the cooling water temperature is + 90 ° C. or higher, the thermo switch 13,
Both 14 are closed. Also, the thermo switch 14
The switch part 1 of the B contact relay 15 is closed by
5a opens. Therefore, the fan motor 12 operates because it is supplied with current. On the other hand, although the thermo switch 13 is closed, the switch section 15 of the B contact relay 15
Since a is open, no current flows through the carburetor heater 11. Therefore, the carburetor heater 11 does not generate heat and the carburetor is not heated.

As described above, in the engine temperature control apparatus according to this embodiment, when the fan motor 12 is operating, the carburetor heater 11 is turned on regardless of whether the atmospheric temperature is + 5 ° C. or lower. Can be turned off.
Therefore, even if the temperature of the cooling water rises to + 90 ° C or higher even though the atmospheric temperature is + 5 ° C or lower, for example, when the engine is idling for a long time in cold weather, the fan Since the motor 12 and the carburetor heater 11 do not operate at the same time, it is possible to prevent the power consumption of the battery from increasing.

[0030]

As described above in detail, according to the present invention, it is possible to provide an engine temperature control device capable of preventing an increase in power consumption of a battery due to an overlap of electric loads. Also, the generator can be downsized.

[Brief description of drawings]

FIG. 1 is an electric circuit diagram schematically showing a circuit configuration of a temperature control device according to an embodiment of the present invention.

FIG. 2 is an electric circuit diagram schematically showing an example of a circuit configuration of a conventional temperature control device.

[Explanation of symbols]

 11 carburetor heater 12 fan motor 13,14 thermo switch 15 B contact relay 16 power supply line

Claims (1)

[Claims] 1. A carburetor heater for keeping the carburetor warm when the atmospheric temperature is below a first predetermined temperature, and a cooling fan is driven when the engine cooling water is above a second predetermined temperature. In an engine temperature control device including a fan motor for air cooling the engine cooling water, is the atmospheric temperature below the first predetermined temperature when the fan motor is operating? An engine temperature control apparatus comprising control means for turning off the carburetor heater regardless of whether or not the carburetor heater is turned off.