JPS634642Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is an electric heating device for automobiles.
Regarding improvement of its operability.

In conventional electric heating systems for automobiles, the activation switch is provided independently for starting and stopping the operation, making installation of the activation switch complicated, and in devices such as automobiles where installation space is limited. Then, the above-mentioned devices that require installation space are problematic.

In addition to this heating device, various switches related to driving operations are installed in the driver's seat of the car.
For example, when operating a heating device activation switch while driving a car, there is a risk of accidentally switching between activation and deactivation, which may even affect automatic driving operations. As described above, when a heating device is installed in a car, its operability is very important.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to provide an electric heating device for automobiles with excellent operability.

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

FIG. 1 shows how this electric heating device is installed on the driver's seat of a car.
, for example, on the top surface. As shown in FIG. 2, this heating unit 50 includes a fan 5 and a motor 4 in a rectangular upper case 53 made of heat-resistant resin, and a heating element having a honeycomb structure having a large number of through holes 54 on the downstream side of the blown air. 55, air outlet 5
6.Blowout grill 57 that can adjust the wind direction vertically and horizontally
and a suction port 58 with a wire mesh. The circuit for supplying electricity to the heating unit 50 includes a battery 1 mounted on the vehicle, an ignition switch 2 for engine operation, a control circuit 6, a self-resetting single switch 7, and a fan 5 that supplies the voltage applied to the battery 1.
and a relay 11 that energizes the motor 4.

Hereinafter, the electric circuit of this heating device will be explained in detail using FIG. 3.

Reference numeral 1 denotes an automobile battery, to which an ignition switch 2 for operating an automobile engine is connected. A relay coil 11a of a relay 11 is connected to the ignition switch 2.
When the relay coil 11a is energized, it closes the contact 11b, connecting the heater 3 and the motor 4 to the battery 1. In this example, the heater 3 is made of a ceramic semiconductor having a positive resistance temperature characteristic.
The motor 4 drives a fan 5 that blows the air heated by the heater 3 .

Reference numeral 6 indicates a control circuit of this electric heating device,
An operating switch 7, a water temperature switch 8, an ignition switch 2, and a relay coil 11a are connected to connection terminals 6a, 6b, 6c, and 6d of the control circuit 6, respectively. The single operating switch 7 is provided on a steering column 52, a heating unit 50, an instrument panel of an automobile, etc., and is manually operated. The operating switch 7 is of a self-resetting type, and the contacts are closed while the operator presses the switch with a finger or the like, and the switch is disengaged by the action of a spring or the like the moment the finger is released. The water temperature switch 8 is composed of a bimetal, reed switch, etc., and is designed to detect the temperature of the cooling water of the automobile engine and turn on when the temperature is below a set temperature and turn off when the temperature exceeds the set temperature.

The control circuit 6 includes a Zener diode 12, a voltage comparator 10, and resistors 13, 14, 15, 16, 1
7, 18, 40, a flip-flop circuit 9, not gates 19, 21, transistors 20, 22, 23,
It is composed of.

The voltage input point 10a is a reference voltage that is divided by resistors 14 and 40 and receives positive feedback via resistor 16.
V ₀ is inputted, and voltage input point 10b is divided by resistor 15, resistor 18, and resistor 17, and voltage V ₁ that changes according to fluctuations in the voltage of battery 1 is inputted. It's becoming like that.
When the input voltage V ₁ is greater than the reference voltage V ₀ , a high level 1 output signal is output to the output point 10c, and when the input voltage V ₁ is less than the reference voltage V ₀ , a low level output signal is output to the output point 10c. is served. Further, the collector side of a transistor 20 is connected to the output point 10c, and when the water temperature switch 8 is on, the transistor 20 is turned off, and the output signal from the comparator 10 appears at the output point 10c. When the water temperature switch 8 is off, the transistor 20 is on, grounding the output point 10c and setting the voltage to zero. The output signal at the output point 10c is inverted by a not gate 21 and input to the input terminal CL of the flip-flop circuit 9. In addition, the input terminal CP of the flip-flop circuit 9
A not gate 19 is connected to the not gate 19, and the not gate 19 inputs a high level signal to the input terminal CP every time the operating switch 7 is turned on.

This flip-flop circuit outputs the level state of the terminal D at that time to the output terminal Q every time a high level signal is input to the input terminal CP, and the terminal D maintains the opposite level state. It's summery. Therefore, each time the operating switch 7 is turned on, high level and low level signals are alternately output from the output terminal Q. Note that when a high level signal is output from the output terminal Q, the transistors 22 and 23 are turned on, the relay coil 11a is energized, and the contact 11b is closed.

However, when a high level signal is input to the reset terminal CL, the output terminal Q becomes a low level.

The control circuit 5 configured as described above is formed on a single printed circuit board (not shown), and the relay 1
1, the heater 3 and the motor 4 can be installed in a case that is housed therein. Therefore, the entire device can be made smaller, which is very effective in applications where installation space is a problem, such as automobiles.

Next, the operation of this embodiment with the above configuration will be explained.

First, when the engine coolant temperature is sufficiently low and the water temperature switch 8 is closed, when the ignition switch 2 is turned on, when the voltage of the battery 1 is greater than a predetermined value, that is, the input voltage V ₁ at the input point 10b of the comparator 10. When is larger than the reference voltage V ₀ at the input point 10a, a high level signal is output from the output point 10c, which becomes low level through the not gate 21 and is sent to the reset terminal of the flip-flop circuit 9.
Input to CL. Therefore, since the terminal D is maintained at a high level and the output terminal Q is at a low level, in this state, the heater 3 and the motor 4 are not energized and the heating device does not operate.

Next, when the operating switch 7 is turned on for a moment, a high-level pulse signal is input from the not gate 19 to the input terminal CP, so a high-level output is output from the output terminal Q, and the transistor 22,
23 is turned on, relay coil 11a is energized and contacts 11b are closed, heater 3 is energized and generates heat, motor 4 drives fan 5, and fan 5 blows air heated by heater 3. It's becoming like that.

Here, when the engine coolant temperature becomes higher than the set temperature, the transistor 20 is turned on.
The voltage at the output point 10c of the comparator 10 is grounded and 0.
becomes. Therefore, the not gate 21 outputs a high level signal to the reset terminal CL, the output terminal Q of the flip-flop circuit becomes a low level, the transistors 22 and 23 are turned off, the relay coil 11a is cut off, and the contact 11b is closed. When opened, the heater 3 and motor 4 are de-energized.

Further, when the voltage of the battery 1 becomes less than a predetermined value, the voltage at the output point 10c of the comparator becomes 0, and the electricity to the heater 3 and motor 4 is cut off in the same manner as above.

Also, water temperature switch 8 is on, battery voltage 1
is larger than a predetermined value and the heater 3 and motor 4 are energized, when the operating switch 7 is turned on again, a high level signal is input to the input terminal CP of the flip-flop, and a low level signal is output from the output terminal Q. Similarly, power to the heater 3 and motor 3 is cut off.

Next, another embodiment of the present invention will be described.
FIG. 4 shows its circuit diagram, in which a timer circuit 39 is provided in place of the water temperature switch 8. Therefore, at the same time as the activation switch 6 is turned on, a pulse signal is input to the timer circuit 30 from the connection point 31.
The output point 10c of 0 is grounded, and the potential of the output point 10c is set to 0.

In other words, this electric heating device is used as an auxiliary heating device until the car engine cooling water rises when the car engine starts, and after a certain period of time has passed after the electric heating device starts operating. Assuming that the engine coolant temperature has risen sufficiently, the operation of this electric heating system is stopped, and the interior of the vehicle is then heated by an air conditioner (not shown) that has a heater core that uses the engine coolant as a heat source. All you have to do is do this. Note that the other parts of FIG. 4 are the same as the electric circuit shown in FIG. 1, so their explanation will be omitted.

As described above, the present invention is highly operable and practical as an electric heating device for automobiles, and has the following effects.

(1) There is only one activation switch, and each time the device is turned on, the device alternates between activation and deactivation, so the possibility of the crew operating the activation switch by mistake is extremely small.

(2) Since it is a single switch, it can be made smaller and requires less installation space than multiple switches.

(3) When the engine coolant temperature rises and reaches a predetermined temperature, or when a predetermined period of time has elapsed since the start of power supply to the heating system, the power supply to the heating system is automatically stopped, causing unnecessary battery over-discharge. can be prevented and battery protection can be achieved.
Also, by stopping the heating system, passengers can know when the existing hot water heater is starting to work.

[Brief explanation of the drawing]

Fig. 1 is an overall configuration diagram showing an embodiment of the present invention, Fig. 2 is a sectional view showing the heating unit in Fig. 1, and Figs. 3 and 4 are electrical circuit diagrams showing an embodiment of the present invention. . 3...Heater, 4...Motor, 5...Fan,
6... Control circuit, 7... Operating switch, 8... Water temperature switch, 10... Comparator, 9... Flip-flop circuit.

Claims (1)

[Scope of utility model registration request] A heater that generates heat when energized, a fan that blows air heated by the heater, and a motor that drives this fan, and when operated, generates an operation start signal and an operation stop signal for the motor and the heater. A self-returning single switch is generated, and each time this switch is operated, the intermittent supply of electricity to the motor and heater is reversed, and when the automobile engine cooling water reaches a set temperature, or the supply of electricity to the heater and motor is switched on and off. An electric heating device for a vehicle, comprising: a control circuit that forcibly cuts off electricity to the heater and the motor when the time exceeds a certain set time, regardless of whether the switch is turned on.