JPS5888547A - Control device for air conditioner - Google Patents

Abstract

PURPOSE:To improve an efficiency by a constitution wherein the amount of feeding fuel is controlled by the deviation of a temperature at the vicinity of the primary side of an indoor side heat exchanger with respect to a set value and the output torque of an internal-combustion engine, in the air conditioner equipped with a compressor driven by the internal-combustion engine. CONSTITUTION:The set value of a room temperature setter 11, provided in a room to be air-conditioned, and a room temperature, measured by a room temperature sensitive element 8 provided at the primary side of the indoor side heat exchanger 5 and a linearize 13, are compared in a first active element 14, then, the difference is inputted into a second active element 16. On the other hand, the output torque of the engine, outputted by a F/V convertor 15 in accordance with the frequency of rotation outputted by a rotation sensor 3 for the internal-combustion engine, is inputted into the second active element 16 and added to the input of the temperature difference, then, is inputted into an output convertor 17. A fuel amount control valve 2 is controlled through an oscillating circuit 18 and a driver section 19 to adjust the revolving number of the engine. According to such constitution, the efficiency may be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air conditioner 1 which is compressed siv-driven by an internal combustion engine and constitutes a refrigeration cycle from an outdoor heat exchanger, an expansion valve, an indoor heat exchanger, etc. It is related to the control of

Conventionally, internal combustion engine C: empty fil which used to drive the compressor.
In Japanese air conditioners, a temperature sensing element installed on the primary side C of the indoor heat exchanger detects changes in the air conditioning load in the air conditioning room, starts and stops the internal combustion engine, and adjusts the capacity of the air conditioner. Starting an engine is not easy with an electric motor and requires a large amount of electric power, so it was necessary to minimize the number of times the internal combustion engine was started and stopped. As a result, the set temperature range became large, resulting in rough air conditioning. In addition, the large model C2G was equipped with an unloader mechanism to cope with °C load fluctuations, but at low load (-8) the internal combustion engine continues to operate (= emergency C: efficiency decreases). It was bad.

In view of these points, the present invention has been developed in accordance with the present invention. The air conditioner consists of a compressor driven by an engine, an outdoor heat exchanger, an expansion valve, and an indoor heat exchanger.
:The facility is equipped with a temperature sensing element that detects the warm state of the air conditioning room. A first active element outputs the difference between the temperature value and the set value, and the output of the @1 active element and the rotational output of the internal combustion engine. and a second active element that outputs a control signal to control the fuel amount control valve of the internal combustion engine, and is configured to steplessly change the direction of output of the internal combustion engine depending on the temperature condition of the air conditioning room (== to achieve high efficiency). This enables air-conditioned operation.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which an air conditioner control device according to the present invention is used to control an engine heat pump will be described below with reference to the drawings.

il+ is a compressor (5) whose rotational speed is varied by a fuel control valve (2) and which is driven by a rotational sensor (4) equipped with a 31st grade V141
Expansion valve (6), outdoor heat exchanger (7), compressor (1)
A refrigerant heat pump cycle is configured through an indoor heat exchanger equipped with a temperature sensor (8), a blower fan (9), etc. on the primary side, and (to) an air conditioner with a room temperature setting device 01. chamber, (13 is rotation sensor C3), humidity sensor (
8), Input C of room temperature setting device 09, etc.: Fuel control valve (2)
) 'i' is a control unit that controls the rotational speed of the engine (4) and is configured as follows. 0 is a linear quiz that converts the voltage value of the temperature sensing element 18) that detects room temperature, and 041 is a voltage conversion between the setting value of the room temperature setting device aI installed in the air conditioning room (to) The output is a value corresponding to the difference from the room temperature value. 11 active elements, 0 is by rotation sensor (3) ^ F / V converter sensor that outputs a voltage value according to rotation - wave number 0
9 is a second active element that outputs an open side signal for controlling the fuel amount control valve (2) v based on the output of the active element a- of $1 and the output of the F/V converter 051; o9 is! 82 active elements 061
an output converter for changing the output signal C double pulse width of the output signal C with a different deity depending on the oscillation station wave number on the oscillation circuit side;
a9 is the output signal C of the output converter 0ffi; the driver section g and &l are respectively connected to the output of the F/V converter O5) which controls the fuel control valve (2) of the engine (4); ) is an upper limit output section S and an upper limit output section that output C2 when the rotation speed reaches the set upper limit value 8 and the upper limit value.

Since one embodiment of the air conditioner control device of the present invention is configured as described above, when performing heating operation, the compressor 111(1) is driven by the engine (4).

Heating operation is performed by a refrigerant heat pump cycle using an indoor heat exchanger (5), an expansion valve (6), an outdoor heat exchanger (7), etc. Here, the room temperature setting device 0υ installed in the air conditioning N@ The room temperature value based on the set value and the next side of the indoor heat exchanger (5) (the two moisture sensing elements (8) that are provided to sense the room temperature of the air conditioning room) and the nearerization t13 and the active element OJ of t'@1 (: Compare with active element Q8, i.e. active element 04 of '@1
If the output of C is a positive value, C; is the increased value obtained by adding the output M of the active element 041 of @1 to the output value of the engine (4). II! is the new rotation value of the engine (4). If the output of the active element G8 of Igl is a negative value, the rotational output value of the engine (4) +=
Output value of active element 041 of i11! In addition, the decreased value is set as the new rotation value of the engine 4) and the pulse width is constant according to the setting of the rotation value of the new engine (4) by what is output from the active element 08 of $2. falT to station wave number
The fuel control valve (2) is controlled via the oscillation circuit side .

Furthermore, when the air conditioning load on the air conditioning Wi (to) becomes excessive and the rotational speed of the engine (4) increases, the upper limit output section operates to output an upper limit signal and the control section (not shown) controls the engine (
En-(4) protection, such as stopping 4) or reducing the set value, is performed. Similarly, when the air conditioning load changes or decreases, the lower limit output of C2 is 811211! Protection is provided from the second step.

In addition, in one embodiment of the present invention, it was used for heating operation, but cooling operation is also possible by changing the flow of refrigerant by installing a four-way valve or the like. Smooth control similar to the above can be achieved by inverting the output of the active element J1. Figure @3 is a system schematic diagram of two other embodiments in which the control circuit of the air conditioner is used in a system having a water heat exchanger.

The air conditioner control device of the present invention includes a compressor, an outdoor heat exchanger, and an expansion valve driven by an internal combustion engine.

An air conditioner comprising an indoor heat exchanger, etc., includes a temperature sensing element installed near the primary side of the indoor heat exchanger to sense the temperature of the air conditioning room, and the temperature sensing element l: a room temperature value according to Difference from set value! Output v! 1 and a second active element that outputs a control signal T for controlling the fuel amount control valve of the internal combustion engine based on the output of the active element $1 and the rotational output of the previous C internal combustion engine. Therefore, it is possible to obtain the optimum output of the internal combustion engine depending on the condition of the air conditioning load in the sub-air room.In other words, it is not necessary to start/stop the internal combustion engine or to use an unloader mechanism. Since the control can be performed, it is possible to perform detailed and comfortable sudden air harmonization.Furthermore, since the capacity is not adjusted by starting and stopping the internal combustion engine, the power consumption due to starting and stopping the internal combustion engine is significantly reduced by approximately 1"WJ. Ru. In addition, it is extremely effective in practical terms, such as whether or not an unloader msv is required.

[Brief explanation of the drawing]

Fig. 1 is a system schematic diagram of an embodiment of the present invention, Fig. 182 is an electric circuit diagram of the control section in Fig. 8, and Fig. 3 is a system schematic diagram showing an embodiment of the present invention. be.

Claims (1)

[Claims] (1) An air conditioner consisting of a compressor, an outdoor heat exchanger, an expansion valve, an indoor heat exchanger, etc. driven by an internal combustion engine.
Near the primary side of the indoor heat exchanger C: Temperature 1t'% of the air-conditioning room equipped with: a temperature sensing element for sensing, and the temperature sensing element (
an active element I81 that outputs the difference between the room temperature value and a set value according to 1. A control device for an air conditioner, comprising: a second active element that outputs an output.