JPH0740219U - Simple heating system for automobiles - Google Patents

Abstract

(57) [Summary] [Purpose] To suppress unnecessary power consumption. [Composition] One of the input terminals of the comparison circuit 14 to which the power supply voltage is input is grounded via a capacitor C ₂ having a predetermined capacity, and the output terminal of the comparison circuit 14 is connected to the base of the transistor T _r4. Thus, the simple heating heater 1 and the fan 2 are turned on / off.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a simple heating device for an automobile.

[0002]

[Prior art]

 In an automobile heating system, when the vehicle is parked on the road for a long time in winter, the engine will cool and the engine cooling water used for heating will be in a low temperature state. Even if heating is started by circulating water, the temperature of the air blown into the vehicle cannot be suddenly raised.

For this reason, recently, in addition to the heating device, a simple heating device is provided to supply warm air into the vehicle in a short time by a heater heated by using battery power until the engine warms up. What is done is considered. In such a simple heating device, a switch provided near the driver's seat in the front part of the vehicle can be turned on to energize the heater and drive the fan to quickly supply warm air into the vehicle. There is.

[0004]

[Problems to be solved by the device]

 However, in the above-described simple heating system for automobiles, since the heater is energized by manually switching the switch, there is a problem such as forgetting to turn it off, and battery power is consumed more than necessary. The present invention has been made in view of the above problems, and an object of the present invention is to provide a simple heating device for an automobile that consumes less power.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention grounds one of the input terminals of a comparator circuit to which a power supply voltage is input via a capacitor having a predetermined capacity, and connects the output terminal of the comparator circuit to the base of a transistor. By doing so, the simple heating heater is turned on and off.

[0006]

[Action]

 According to the above configuration, the transistor is turned on by the output from the comparison circuit while the capacitor is being charged, and the heater is energized to supply the warm air to the inside of the vehicle. Then, when the capacitor is charged, the output state from the comparison circuit is switched, and the transistor shows the off state, so that the power supply to the heater is cut off.

[0007]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows an electric circuit for driving a heater 1 and a fan 2 of a simple heating system for an automobile according to the present invention. This electric circuit is generally provided with a main switch circuit 3, a first temperature detection circuit 4, a second temperature detection circuit 5, and a timer circuit 6, which turn on the first to third switching circuits 7, 8 and 9. When turned off, the heater 1 and the fan 2 are driven / stopped. Reference numeral 10 denotes a fan drive circuit of a heating device that heats the engine cooling water.

In the main switch circuit 3, the first and second transistors T _r1 and T _r2 and the main switch SW ₁ are connected to the terminals of the ignition IG, and when the main switch SW ₁ is turned on, both the transistors T _r1 and T _r are turned on. _{Even if r2} is turned on and the main switch SW ₁ is turned off thereafter, the on state is maintained. The collector of the first transistor T _r1 is connected to both input terminals of the first comparator 11, and the negative input terminal is grounded via the capacitor C ₁ . Therefore, while the voltage value input to the plus input terminal of the first comparator 11 is constant, the voltage input to the minus input terminal gradually rises as the capacitor C ₁ is charged. , It gradually drops as it is discharged. Therefore, the High signal and the Low signal are alternately output from the output terminal of the first comparator 11 to form a pulse.

In the first temperature detection circuit 4, the first thermistor Th ₁ which is an inside air sensor provided inside the vehicle is connected to the negative input terminal of the second comparator 12. Therefore, the resistance of the first thermistor Th ₁ moves up and down depending on the inside air temperature, and the voltage value input to the minus input terminal of the second comparator 12 changes. As a result, the output terminal of the second comparator 12 outputs the Low signal while the inside air temperature is low, and outputs the Hi gh signal when the inside air temperature is high.

In the second temperature detection circuit 5, the negative input terminal of the third comparator 13 is connected to a second thermistor Th ₂ which is a blower outlet temperature sensor, and the input voltage rises and falls depending on the change in the blower outlet temperature. It is designed to move. Further, the sawtooth voltage from the main switch circuit 3 is input to the positive input terminal of the third comparator 13. Therefore, the voltage value of the negative input terminal changes due to the resistance of the second thermistor T _h2 moving up and down according to the temperature of the blower opening. Therefore, if the temperature rises, the output time of the High signal from the output terminal becomes longer. Conversely, the lower the temperature, the longer the output time of the Low signal.

In the timer circuit 6, the third transistor T _r3 is turned on / off based on the pulse signal of High and Low from the first comparator 11 of the main switch circuit 3. As a result, the charging of the capacitor C ₂ is started, and the input voltage at the positive input terminal of the fourth comparator 14 gradually increases as the charging continues. During this time, the voltage input to the negative input terminal is a constant value. Therefore, the signal output from the output terminal of the fourth comparator 14 is switched to the High signal after a predetermined time has passed from the Low signal, that is, when the capacitor C ₂ is charged by a predetermined capacity. In this case, since a pulsed signal is input to the capacitor C ₂ , it can be used for switching the output signal from the fourth comparator 14 without increasing its electrostatic capacitance so much. SW ₂ is a switch for turning off the heater 1 and the fan 2.

In any of the first to third switching circuits 7, 8 and 9, if any one of them is turned off, the heater 1 and the fan 2 are connected in series so as not to be energized. In the first switching circuit 7, the base of the transistor T _r4 is connected to the output terminal of the fourth comparator 14 of the timer circuit 6, after a predetermined time has elapsed since the main switch SW ₁ to the ON state, the transistor T _r4 is It is turned off. Further, in the second switching circuit 8, the output terminal of the second comparator 12 of the first temperature detection circuit 4 is connected to the base of the transistor T _r5 , the temperature inside the vehicle rises, and the temperature of the first thermistor Th ₁ increases. The decrease in the resistance value turns off the transistor _Tr5 . Further, in the third switching circuit 9, the output terminal of the third comparator 13 of the second temperature detection circuit 5 is connected to the base of the transistor T _r6 , and the on / off ratio is based on the change in the blower outlet temperature. Is changing.

In the fan driving circuit 10, the transistors T _r7 , T _r8 , and T _r10 are sequentially turned on and the transistor T _r11 is turned off when the first and second switching circuits 7 and 8 are both on. As a result, the blower provided in the unit (not shown) is turned off. As a result, the heating device that uses engine cooling water does not blow air into the vehicle while the simple heating device is being driven. When one of the switching circuits 7 and 8 is turned off, the transistors T _r7 , T _r8 and T _r10 are sequentially turned off and the transistor T _r11 is turned on, so that the blower is turned on. Normal heating operation is started.

In a simple heating system for an automobile equipped with the electric circuit configured as described above, the outside air temperature is low in winter, etc., and the engine cooling water temperature is lowered by stopping the engine for a long time during parking or the like. Used for.

In this simple heating, first, the main switch SW ₁ is turned on to turn on the first and second transistors T _r1 and T _r2 . In this case, even if the main switch SW ₁ is turned off, the transistors T _r1 and T _r2 maintain the on state. When a signal is input to the first comparator 11 in this way, the input voltage to the positive input terminal becomes larger than that to the negative input terminal during charging of the capacitor C ₁ , so the High signal is output to the output terminal. Is output. If the input voltage to the negative input terminal increases as the capacitor C ₁ is charged, the voltage relationship with the positive input terminal is reversed and the Low signal is output. Additionally, decreased voltage applied to the capacitor C ₁ is, the capacitor C ₁ is discharged, during the High signal from the Low signal input voltage to the negative input pin is gradually decreased. Hereinafter, similarly, the output of the first comparator 11 is switched and a pulse signal is issued.

Further, due to a change in the charging state of the capacitor C ₁ , a sawtooth signal is input to the positive input terminal of the third comparator 9 in the second temperature detection circuit 5. Immediately after turning on the main switch SW ₁ , the temperature at the air outlet of the simple heating device is low, so the resistance value of the second thermistor Th ₂ is high and the voltage value input to the plus input terminal is high for a short time. The signal output from the output terminal becomes longer when it is Low. Therefore, the on-time in the third switching circuit 13 becomes long, the on-time of the transistor TR, that is, the energization time to the heater 1 becomes sufficient, and the charging of the capacitor C ₃ is instantaneously terminated and the heater is When the heating of the ambient air by 1 is started, the transistors T _r7 , T _r8 , and T _r9 are sequentially turned on, so that the fan 2 is driven and hot air is supplied into the vehicle. Then, if the temperature detected by the second thermistor Th ₂ becomes higher, the opposite state, that is, the energization time to the heater 1 becomes shorter, and the blast temperature is appropriately adjusted.

On the other hand, since the vehicle interior temperature is low immediately after the main switch SW ₁ is turned on, in the first temperature detection circuit 4, the resistance value of the first thermistor Th ₁ which is an inside air sensor is high, and the second comparator is With the input voltage of 12, the positive input terminal is lower. In this state, the second switching circuit 8 maintains the ON state. When the engine is warmed up and heating by the heating device is appropriately performed and the vehicle interior temperature rises, the resistance value of the first thermistor Th ₁ decreases, and the output of the second comparator 12 decreases. Switches to the High signal. As a result, the second switching circuit 8 is turned off and both the heater 1 and the fan 2 are stopped. In this case, the blower in the unit is turned on as described above.

In parallel with the control of the first temperature detecting circuit 4, the timer circuit 6 controls the heater 1 and the fan 2 as follows. That is, in the timer circuit 6, a pulse signal to the base of transistors T _r3 from the output terminal of the first comparator 11 is inputted. As a result, the transistor T _r3 is repeatedly turned on and off, and charging of the capacitor C ₂ is started. Immediately after the start of charging, the voltage of the negative input terminal of the fourth comparator 14 is high, the Low signal is output to the output terminal, and the transistor _Tr4 of the first switching circuit 7 maintains the on state. When the charging of the capacitor C ₂ is completed, the input voltage of the plus input terminal of the third comparator 13 becomes high, and the High signal is output to the output terminal. As a result, even if the inside air temperature has not risen to the desired temperature, the first switching circuit 7 is turned off and both the heater 1 and the fan 2 are stopped. Also in this case, the blower in the unit is turned on as described above, as described above.

As described above, since the output signal of the fourth comparator 14 is switched based on the charging time of the capacitor C ₂ , the simple timer circuit 6 can be constructed. Further, since the signal charged in the capacitor C ₂ has a pulse shape, a desired timer time can be set without increasing the electrostatic capacity.

[0020]

[Effect of device]

 As is clear from the above description, according to the automobile simple heating device of the present invention, the heater can be de-energized at the time when the capacitor is charged. This eliminates the need for manual operation and reduces wasteful power consumption of the battery.

[Brief description of drawings]

FIG. 1 is a control circuit diagram of a vehicle simple heating system according to an embodiment.

[Explanation of symbols]

1 ... heater, 2 ... Fan, 14 ... fourth comparator (comparison circuit), C ₂ ... capacitors, T _r4 ... transistor.

Claims (1)

[Scope of utility model registration request] 1. A simple heating system in which one of the input terminals of a comparison circuit to which a power supply voltage is input is grounded via a capacitor having a predetermined capacity and the output terminal of the comparison circuit is connected to the base of a transistor. A simple heating device for an automobile, characterized in that a heater for a vehicle is turned on and off.