KR960008143B1 - System for controlling a hot & cold condition of seat of automobile - Google Patents

Abstract

The system efficiently controls air conditioner for the automobile by using a plurality of thermoelectric devices and heat pipes, specially switches off the automatic cooling/warming controller in the case of no man in the automobile by using a load cell installed in a seat. The system comprises: one temp. controller(40) controlling a high temp. part in the warming mode; another temp. controller(80) controlling a low temp. part in the cooling mode; another temp. controller(100) controlling a high temp. part in the cooling mode; a subtraction device(61a) obtaining temp. error(Terror5) between a reference warming temp.(Tref5) and a temp(Treal5) of a high temp. thermoelectric device(67); a multiplier(62) multiplying the temp error(Terror5) by a gain constant(K); another subtracter(61b) obtaining speed error(RPM error1) between a reference RPM(RPM ref1) and a current RPM(RPM real1) of a fan(66); a controller(63) driving a solenoid valve(65) driver(64) during the "on" period of the pulse signals corresponding to the speed error(RPM error1).

Description

Car heating and cooling control system

1 is a schematic block diagram of a cooling and heating control system for a vehicle seat according to the present invention.

FIG. 2 is a detailed block diagram of the vehicle seat and air conditioning control system shown in FIG.

3 is a block diagram of a conventional vehicle air conditioning control system.

Figure 4 is a side cross-sectional view of the air-conditioning device for a seat of the present invention of the present applicant.

FIG. 5 is a sectional front view of the seat air conditioner shown in FIG.

* Explanation of symbols for the main parts of the drawings

10: temperature variable switch 20: current direction switching device

30: heating high temperature unit 40: heating high temperature control unit

41,61a, 61b, 81,101a, 101b: Subtractor

42,63,82,103: Controller 43,64,83,104: Driver

44,67,84,107: thermoelectric element 45,68,85,108: temperature sensor

50: heating low temperature unit 60: heating low temperature control unit

62,102 Multiplier 69,109 Speed Sensor

65,105: Solenoid Valve 66,106: Fan

70: cooling low temperature unit 80: cooling low temperature control unit

90: cooling high temperature unit 100: cooling high temperature control unit

The present invention relates to a cooling and heating control system using a plurality of thermoelectric elements, and in particular, heating and cooling for a car seat for efficiently controlling a heating and cooling system for a vehicle using a heat pipe (or a thermosyphone) and a thermoelectric element together. It relates to a control system.

A typical automotive heating and cooling control system for controlling a cooling and heating system using a thermoelectric element has a form as shown in FIG.

The air-conditioning control system is provided with a plurality of ducts (Duct), which is a vent pipe for passing air supplied from a fan (Fan) and the like, the plurality of ducts are located different from each other.

As shown in the figure, the conventional automotive air conditioning system is a heating high temperature control unit 120 for controlling the temperature of the high temperature unit 110 of the thermoelectric element during heating and the low temperature unit 130 of the thermoelectric element during cooling The cooling low temperature control unit 140 for controlling the temperature and the cooling high temperature control unit 140 for controlling the temperature of the high temperature unit 150 of the thermoelectric element at the time of cooling.

The temperature control operation at the time of heating and cooling in the conventional automotive air conditioning control system having the configuration as described above will be described below.

First, the temperature control process of the high temperature unit 110 of the thermoelectric element during heating will be described. When the user sets the reference heating temperature Trefl through the switch installed in the vehicle interior, the current of the high temperature part of the thermoelectric element detected from the thermoelectric element 124 through the set reference heating temperature Trefl and the temperature sensor 125 is set. The temperature Trele is input to the subtractor 121 to detect a temperature error value Terrorl = Trefl-Treall. Next, when this detected temperature error value Terrorl is input to the controller 122, the controller 122 corresponds to a pulse width corresponding to the temperature error value for each set time interval until the temperature error value becomes zero (0). A pulse width modulation (PWM) signal, that is, a square wave signal having a predetermined duty ratio is generated and provided to the driver 123. Accordingly, the driver 123 supplies current to the thermoelectric element 124 for a predetermined time corresponding to the duty ratio of the square wave signal from the controller 122, thereby finally adjusting the heating temperature set by the user.

That is, the temperature control loop of the high temperature control unit 120 at the time of heating forms a closed loop connected as described above.

Next, a temperature control process of the low temperature unit 130 of the thermoelectric element during cooling will be described. The temperature control method of the low temperature part 130 of the thermoelectric element at the time of cooling is substantially the same as the temperature control method of the high temperature part at the time of heating. That is, as can be seen from FIG. 3, the control to the desired temperature set by the user is executed through the connected loop. However, the difference between the temperature control method of the low temperature unit 130 of the thermoelectric element during cooling and the temperature control method of the high temperature unit 110 of the thermoelectric element when heating is different from the temperature sensor 125 in the case of heating. The temperature sensor 145 is located in the low temperature part of the thermoelectric element 144 in the case of cooling and located in the high temperature part. In other words, the attachment position of the temperature sensor is different.

On the other hand, referring to the temperature control method of the high temperature unit 150 of the thermoelectric element during cooling, the current temperature (Treal3) of the high temperature unit of the thermoelectric element 167 detected by the reference cooling temperature (Tref3) and the temperature sensor 168 set by the user. ) Is input to the subtractor 161a and the temperature error value (Terror3 = Tref3-Treal3) is detected, the multiplier 162 multiplies the temperature error value Terror3 by a constant K having a predetermined gain and rotates per minute. Extract the reference speed (RPM ref) of the fan.

Then, the extracted reference speed RPM ref and the current speed RPM real of the fan 166 detected by the speed sensor 169 are input to the subtractor 161b to detect the speed error value RPM error. do. The controller 163 then drives the driver 164 for a predetermined time in response to the duty of the pulse signal at a time interval set corresponding to the detected speed error value (RPM error), thereby driving time of the driver 164. Correspondingly, the opening time of the solenoid valve 165 is adjusted.

Therefore, the speed of the fan is properly controlled through the above-described process, and accordingly, the amount of air blown from the fan 166 to the thermoelectric element 167 is adjusted so that the heat generated in the high temperature portion of the thermoelectric element 167 is released. The cooling temperature is then set to the desired cooling temperature set by the user.

However, the conventional typical heating and cooling control system in which the temperature is controlled as described above allows temperature control of the high temperature section during heating, but no consideration is given to the temperature control of the low temperature section during heating. In addition, the conventional air-conditioning system is an air-conditioning system in a car interior in which the air-conditioning system is exposed to the outside, and during heat-cooling in an enclosed space such as a seat of a passenger car, heat generated in the high temperature part of the thermoelectric element is easily released to the outside. There is a problem.

On the other hand, Korean Patent Application No. 93-29370 filed by the present applicant (name of the invention: seat air conditioner of the vehicle, filed date: December 23, 1993) in the heating and cooling of the seat of the vehicle, Heat pipes are provided to facilitate the release of heat generated in the hot portion (see FIGS. 4 and 5).

Here, looking at the heat conduction direction at the time of heating and cooling, the high-temperature portion of the thermoelectric element 175 becomes the heat conduction plate 173 by the current flow in the forward direction when heating, but when cooling the current flow is different from the heating The low temperature part becomes the heat conductive plate 173 side by being reversed. Therefore, the heat of the high temperature portion at the time of cooling is transferred to the fin 176 through the heat pipe 174, the heat transferred to the fin 176 is back through the duct 177 by the wind blown from the fan 172. Or it will go out. The heat pipe 174 here is not for heating but acts as a heat radiating means when cooling.

However, the low temperature portion of the thermoelectric element 175 is located between the heat pipe 174 and the duct 177 during heating of the seat air conditioner of the vehicle of the present applicant so that the generated heat is relatively blown by the fan 172. Since a small amount of air is required, there is a problem in that an unnecessary energy loss is caused because a certain amount of current is always supplied to the fan, despite the fact that the current supply to the fan 172 is appropriately adjusted according to cooling and heating.

Accordingly, an object of the present invention is to solve the above-mentioned problems of the prior art and to provide a heating and cooling control system for an automobile seat which improves energy efficiency by effectively performing temperature control during air conditioning.

Another object of the present invention is to provide a heating and cooling control system for a vehicle seat capable of adaptively controlling the temperature according to the riding state of the vehicle.

In order to achieve the above object, the present invention provides a heating and cooling control system for a vehicle seat having a heat composed of a high temperature unit temperature control unit for heating, a low temperature unit temperature control unit for cooling, and a high temperature unit temperature control unit for cooling. And a subtractor for obtaining a temperature error value Terror5 between the reference heating temperature Trel5 and the temperature Treal5 of the high temperature part thermoelectric element measured by the temperature sensor, and a constant K having a predetermined gain in the error value Terror5. A multiplier for calculating a reference rotational speed (RPM refl) of the fan by multiplying), a subtractor for calculating an error value (RPM error1) between the reference rotational speed (RPM refl) and the current speed (RPM real1) of the fan; A subtractor for calculating an error value (RPM error1) between the speed error value (RPM ref1) and the current speed (RPM real1) of the fan, and an on time of a pulse signal corresponding to the speed error value (RPM error1) Drive while Provides a controller, a heating and cooling control system for a car seat, characterized by further comprising a heating when the low temperature section temperature control consisting of a solenoid valve in which the opening degree is controlled by the operation of the drive.

In addition, the air conditioning control system according to the present invention of the above configuration in order to achieve the above another object, for automatically controlling the operation of the control system based on the pressure detection signal from the pressure sensor attached to a predetermined portion of the vehicle seat. It further includes a control device.

Other objects and various advantages of the present invention will become more apparent from the preferred embodiments of the present invention described below with reference to the accompanying drawings by those skilled in the art.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

1 is a schematic block diagram of a cooling and heating control system for a vehicle seat according to the present invention, which is used to control a seating and heating device, which is the applicant of the present invention shown in FIGS. 4 and 5.

As shown in the figure, the air-conditioning control system of the present invention is provided with a temperature variable switch 10 whose temperature is changed in accordance with an operation signal from an omitted operation switch shown by a user, and an operation signal from an operation switch. According to the current direction switching device 20 for switching the current direction of heating and cooling, a high temperature control unit 40 for adjusting the temperature of the high temperature unit 30 at the time of heating to a temperature set by the user, and a low temperature unit ( A low temperature control unit 60 for adjusting the temperature of 50) to a temperature set by the user, a low temperature control unit 80 for adjusting the temperature of the low temperature unit 70 to a temperature set by the user at the time of cooling, and at the time of cooling It includes a high temperature control unit 100 for adjusting the temperature of the high temperature unit 90 to a temperature set by the user. In addition, the cooling / heating mode switch and the current direction switching device 28 shown here are designed to operate synchronously with each other.

Next, the temperature control process of the air-conditioning control system of the present invention having the above configuration will be described in detail with reference to FIG. 2 showing the detailed configuration thereof.

First, referring to the temperature control process of the high temperature unit 30 at the time of heating, as shown in FIG. 2, the high temperature control unit 40 of the heating according to the present invention comprises a subtractor 41 and a controller 42 forming a bellows. , A reference temperature (Terf4) and temperature set by the driver 43, the thermoelectric element 44 (corresponding to 175 of FIG. 4) and the temperature sensor 45, which is set by the user through the temperature variable switch 10 By controlling the current supply to the thermoelectric element 44 based on the temperature error value Terror4 between the current temperature Treal4 of the high temperature portion from the thermoelectric element 44 detected by the sensor 45 to a temperature set by the user. In terms of automatic adjustment, the detailed description thereof is omitted since it is substantially the same as in the above-described conventional heating and cooling control system shown in FIG.

However, in the high temperature control method of heating according to the present invention, a pressure sensing signal from a pressure sensor attached to a predetermined portion of a vehicle seat, not shown, is input to the controller 42 and the controller 42 is based on the pressure sensing signal. Is different from the conventional control system described above in that the high temperature control section 40 of the heating is automatically turned off by being disabled.

That is, the pressure sensor generates a predetermined pulse signal when there is an occupant in the seat and does not generate a pulse signal when there is no occupant. When the pressure sensor does not generate a pulse signal, the controller 42 is disabled. Therefore, the present invention can prevent unnecessary loss of energy by automatically turning off the system when there is no occupant in the seat.

Next, referring to the temperature control process of the low temperature unit 50 during heating, as shown in FIG. 2, the low temperature control unit 60 of the heating according to the present invention is a reference heating of the low temperature unit 50 set by the user. A subtractor 61a for calculating a temperature error value Terror5 between the temperature Tref5 and the current temperature Treal5 of the low temperature portion of the thermoelectric element 67 (corresponding to 175 in FIG. 4), and from the subtracter 61a. A multiplier 62 which multiplies the temperature error value by a constant K having a predetermined gain to calculate a reference speed RPM ref1 of the fan 66 (corresponding to 172 in FIG. 34) representing the revolutions per minute, and the multiplier A subtractor 61b for calculating a speed error value (RPM error1) between the reference speed RPM ref1 from 62 and the current speed RPM real1 of the fan 66, and the speed error from this subtractor 61b. The controller 63 for driving the driver 64 during the on time of the pulse signal corresponding to the error value of every moment based on the value, and the driver 64 The solenoid valve 65 whose opening degree is adjusted by driving, the thermoelectric element 67 connected to the fan 66, and the temperature which senses the present temperature of this thermoelectric element 67 and provides it to the above-mentioned subtractor 61a. The sensor 68 and the speed sensor 69 which detects the current speed of the fan 66 and provides it to the subtractor 61b described above.

Therefore, the low temperature control unit 60 of the heating of the present invention having the above configuration has a temperature error value Terror5 between the reference heating temperature Tref5 and the present temperature Treal5 of the low temperature section from the thermoelectric element 67. The opening time of the solenoid valve 65 is calculated and based on the speed error value RPM error1 between the reference speed RPM ref1 and the current speed RPM ral1 of the fan 66 based on the calculated temperature error value. By controlling the speed of the fan 66 by controlling the control so that the heat generated in the low temperature portion of the thermoelectric element 67 is controlled to be properly released. That is, the heat generated from the low temperature portion of the thermoelectric element 67 is controlled to be appropriately released. That is, since the low temperature portion of the thermoelectric element 67 is located between the heat pipe and the duct as shown in FIG. 4, since the generated heat is relatively small, the amount of air blown by the fan 66 is required. By controlling the opening degree by controlling the current supplied to the fan 66, that is, it is possible to prevent the loss of unnecessary energy.

In addition, in the low temperature control unit 60 of the heating according to the present invention, when the pressure detection signal from the pressure sensor is input to the controller 63 as in the above-described high temperature control method of heating, it is based on the input pressure detection signal. That is, when the pressure detection signal from the pressure sensor is not pressed, the high temperature control unit 60 of the heating is automatically turned off by the controller 63 being disabled.

Meanwhile, referring to the temperature control process of the low temperature unit 70 of the thermoelectric element during cooling according to the present invention, as shown in FIG. 2, the low temperature control unit 80 of the cooling unit includes a subtractor 81 → a controller ( 82) → a driver 83 → a thermoelectric element 84 (corresponding to 175 of FIG. 4) → a temperature sensor 85, and the difference in construction from the high temperature control part 40 of the heating of this invention mentioned above. There is no, but there is a difference in the direction of the current supplied to each thermoelectric element by the current direction switching device 20.

That is, in the case of the above-described heating, the current is applied to the low temperature portion of the thermoelectric element positioned between the heat pipe and the duct, but in the case of cooling, the current is applied to the low temperature portion of the thermoelectric element located between the seat and the heat pipe.

In addition, the controller 82 in the cooling low temperature control unit 80 of the present invention is configured to input a pressure detection signal from a pressure sensor as in the above-described high temperature and low temperature control method of heating, based on the pressure detection signal. Thus, the operation of the low temperature control unit 80 for cooling is controlled on / off.

On the other hand, the high temperature control unit 100 at the time of cooling according to the present invention, as can be seen from Figure 2, two subtractors (101a, 101b), multiplier 102, controller 103, driver 104, By controlling the speed of the fan 106 by adjusting the opening degree of the solenoid valve 105, the above-described control of the heat generated at the high temperature portion of the thermoelectric element 107 (corresponding to 175 of FIG. 4) is controlled. The same as the low temperature control method of heating, but the difference is that in the case of heating, since the low temperature part is located between the heat pipe and the duct, there is little heat generated, so the fan speed must be reduced, while in the case of cooling, the high temperature part is different from the heat pipe. Since the heat generated between the ducts is relatively higher than the low temperature part of the heating, it is necessary to increase the speed of the fan to properly adjust the heat dissipation.

In addition, the controller 103 in the cooling and high temperature control unit 100 of the present invention is configured to input a pressure sensing signal from the pressure sensor as in the high temperature and low temperature of the heating and the high temperature control method of the cooling. The operation of the high temperature control unit 100 for cooling is controlled on / off based on the detection signal.

As described above, according to the present invention, unnecessary heating is prevented by appropriately controlling the speed of the fan so as to correspond to a desired set temperature based on the sensing temperature of the thermoelectric element and the current speed of the fan during heating. When there is no occupant using a pressure sensor attached to a predetermined portion of the car seat, the air-conditioning control system for the seat is automatically turned off, thereby increasing the efficiency of energy utilization.

Claims (2)

In the heating / cooling control system for a vehicle seat having a heat pipe composed of a high temperature part temperature control part 40 of heating, a low temperature part temperature control part 80 of cooling, and a high temperature part temperature control part 100 of cooling, the air conditioning control system includes: The subtractor 61a for obtaining a temperature error value Terror5 between the reference heating temperature Tref5 and the temperature Treal5 of the high temperature part thermoelectric element 67 measured by the temperature sensor 45 and the error value Terror5. A multiplier 62 for multiplying a constant K having a predetermined gain to calculate a reference rotational speed RPM ref1 of the fan, and a current speed RPM real1 of the reference rotational speed RPM ref1 and the fan 66; A subtractor 61a for calculating an error value (RPM error1) between the controller, a controller (63) for driving the drive (64) during an on time of a pulse signal corresponding to the speed error value (RPM error1), An egg consisting of a solenoid valve 65 whose opening degree is adjusted by the drive of the drive. Cooling heating control system for a car seat, characterized in that further comprises a room temperature low temperature control unit (60). The heating and cooling control system for an automobile seat according to claim 1, further comprising a control device for automatically controlling the operation of the control system based on a pressure sensing signal from a pressure sensor attached to a predetermined portion of the automobile seat. .