WO2003106204A1

WO2003106204A1 - Controller of variable displacement compressor

Info

Publication number: WO2003106204A1
Application number: PCT/JP2003/006267
Authority: WO
Inventors: 田口　幸彦
Original assignee: サンデン株式会社
Priority date: 2002-06-12
Filing date: 2003-05-20
Publication date: 2003-12-24
Also published as: JP2004010023A; AU2003234836A1; DE10392799T5; JP4121785B2; DE10392799B4

Abstract

A controller of variable displacement compressor being employed in the load control of an air conditioner, especially the air conditioner for vehicle, where various air conditioning modes are set while taking account of such conditions as the operating condition of the engine or the traveling condition of a vehicle. In the controller (10), a control signal providing means (15) provides the solenoid (211) in the capacity control valve (21) of a variable displacement compressor (20) with a pulse signal having a frequency different for air conditioning control and compressor load control based on the determination of a compressor control means (13) receiving various kinds of information. At the time of air conditioning control, the capacity control valve is controlled with a conduction current smoothed by the inductance of the solenoid when it is turned on/off with a high frequency pulse. At the time of compressor load control, the capacity control valve is controlled as a release valve of on/off control with a low frequency pulse regardless of the suction pressure of a pressure sensitive mechanism (213). The set values are determined, respectively, by the duty ratio of a driving frequency pulse and, at the time of compressor load control, the compressor control means controls the compressor torque T to fall within a specified range by altering the duty ratio. Such a controller can properly controls load on a variable displacement compressor used in an on-vehicle air conditioner.

Description

Description Control device for variable capacity compressor

The present invention relates to a variable displacement compressor control device, and more particularly to a variable displacement compressor control device capable of appropriately controlling the load of a variable displacement compressor used in a vehicle air conditioner. Background art

Conventionally, for example, Japanese Patent Application Laid-Open No. H10-22884 has been disclosed as a technique for this kind of variable displacement compressor and its control method. Further, as for a capacity control valve of a variable capacity compressor, for example, Japanese Patent Application Laid-Open No. H11-110790 has been disclosed.

A conventional variable displacement compressor and its control are, for example, as shown in FIG.

The illustrated variable displacement compressor 120 controls the piston stroke by adjusting the gas pressure in the crank chamber 23. In controlling the piston stroke, for example, the amount of refrigerant gas discharged to the pseudo-contractor 41 of the external refrigerant circuit 40 in the cooling device is adjusted. A capacity control valve 21 is used for adjusting the gas pressure in the crank chamber 23.

Here, the capacity control valve 21 will be described with reference to FIG. 1 and FIG. The pressure-sensitive mechanism 2 13 constituting the lower part in the drawing of the capacity control valve 21 includes a bellows 22 1, a guide 22 2, a spring 22 3, and an adjusting screw 22 4. The bellows 2 2 1 is evacuated and a spring 2 2 3 is arranged. The guide 222 is fixed to the upper end of the bellows 222 on the drawing. The spring 222 biases the guide 222 upward in the drawing. The adjusting screw 224 adjusts the amount of expansion and contraction of the bellows 221 and forms a part of the case.

The displacement control valve 21 further includes a transmission rod 2 16, a valve element 2 12, and a solenoid 2 11. Transmission port 2 1 6 is at the upper end on the drawing of bellows 2 2 1 It is supported so that it can move in the case in contact with it. The valve element 2 12 contacts the other end of the transmission rod 2 16 to open and close the communication path 2 17 between the discharge chamber 22 and the crank chamber 23 according to the expansion and contraction of the bellows 2 21. The solenoid 211 operates as an electromagnetic actuator that generates an electromagnetic force that urges the valve element 212 in the valve closing direction via the plunger 214 and the transmission rod 215.

In such a configuration, no electromagnetic force is generated when the solenoid 211 is not energized. Therefore, in a state where the pressure is balanced, the valve element 2 12 has no urging force in the valve closing direction. Therefore, when the pressure in the suction chamber 24 is high, the bellows 221 contracts, but is urged upward in the drawing by the spring 223, so that the valve element 212 is always open. When the compressor is started in this state, since the gas in the discharge chamber 22 is always introduced into the crank chamber 23, the pressure difference between the crank chamber 23 and the suction chamber 24 increases.

In a current region where the current flowing through the solenoid 211 is equal to or greater than a predetermined value, the generated electromagnetic force becomes larger than the biasing force of the spring 223. For this reason, the valve element 212 is closed, and the pressure in the crank chamber 23 is reduced. Therefore, the pressure in the crank chamber 23 becomes equal to the pressure in the suction chamber 24, and the pressure in the suction chamber 24 gradually decreases. As a result, the valve element 2 1 2 moves in the opening direction.

In this way, the amount of gas introduced from the discharge chamber 22 to the crank chamber 23 can be adjusted by opening and closing the valve element 212.

On the other hand, a variable displacement compressor control device (hereinafter abbreviated as a control device) 110 shown in FIG. 1 controls a solenoid 2 11 of a displacement control valve 21. That is, the control device 110 receives the power supply from the power supply line 3 and passes a current to the solenoid 2 1 1 of the capacity control valve 2 1. Power received from the power supply line 3 is supplied to the solenoid driving means 111 and the current detecting means 112 connected to the solenoid 211 in a long line. For example, in the case of a vehicle, this current is a current having a predetermined duty ratio corresponding to a target current value corresponding to the environment.

The variable capacity compressor control device 110 drives the compressor control means 1 1 3 force solenoid drive means 1 1 1 to supply the above current to the solenoid 2 1 1 and load the valve 2 1 2 To change the set suction pressure. The current detecting means 1 1 2 detects the value of the current supplied to the solenoid 2 11 and feeds it back to the compressor control means 1 13. As a result, the energized current value can be made to gradually coincide with the target current value. Therefore, the operating point of the valve body 212, that is, the pressure control point of the suction chamber, can be changed by the amount of electricity supplied to the solenoid.

Generally, a vehicle-mounted variable displacement compressor is powered by a vehicle engine 30. Further, the variable displacement compressor 120 is one of the auxiliary machines that puts the most load on the power or torque of the vehicle engine 30 and consumes it. Therefore, the variable capacity compressor 120 has a large load on the vehicle engine 30.

In the above-described conventional control device for a variable displacement compressor, the discharge amount of the compressor can be reduced by changing the set suction pressure of the displacement control valve to a value higher than the normal set suction pressure. However, for example, the heat load of the evaporator 42 of the external refrigerant circuit 40 may be excessive in the idling state of the vehicle engine 30 in FIG. In such a state, the suction pressure may exceed the upper limit of the set suction pressure even when the discharge amount is in the maximum displacement state. As described above, since the target of the capacity control is the suction pressure, the control range is limited. Therefore, there is an area where the capacity control becomes impossible in the actual use range of the vehicle. In such a case, in order to reduce the compressor load, the controller turns off the power supply to the displacement control valve and operates with the minimum displacement. That is, the above-described conventional control device for a variable displacement compressor is not preferable because load control of the variable displacement compressor cannot be performed, and air conditioning in the vehicle compartment is significantly impaired.

Accordingly, an object of the present invention is to provide a variable displacement compressor control device suitable for both air conditioning control and compressor load control. Disclosure of the invention

The present invention relates to a control device provided for a variable displacement compressor including a displacement control valve. The displacement control valve has a pressure-sensitive mechanism for transmitting fluctuations in the refrigerant pressure or the refrigerant pressure difference to the valve body, and a pressure-sensitive mechanism that varies the load applied to the valve body in accordance with the input current. And a solenoid for changing the pressure. This control device operates so as to control the energization state of the solenoid to adjust the opening of the displacement control valve, and to control the discharge displacement by changing the pressure of the control pressure chamber.

The control device, which is a feature of the present invention, includes a solenoid drive unit, a current detection unit, and a compressor. It basically comprises a control means, a frequency generation means and a control signal supply means.

The solenoid driving means drives the solenoid, and the current detecting means detects the current flowing through the solenoid. The compressor control means receives a plurality of control requirements, and outputs a plurality of command signals based on the received control requirements and a current value received from the current detection means. The plurality of command signals are preset for opening and closing the capacity control valve. The frequency generating means generates and outputs a solenoid drive frequency corresponding to each of the plurality of command signals. The control signal supply means receives one of the plurality of command signals, and selects a solenoid drive frequency corresponding to the received command signal from the output of the frequency generation means. The selected driving frequency is supplied as a control signal to the solenoid driving means.

Therefore, different solenoid drive frequencies corresponding to the respective applications are prepared based on the conditions set by the compressor control means. Therefore, the characteristics of the displacement control valve can be changed by these selections.

The control device, which is a feature of the present invention, further includes a diode connected in parallel with the solenoid to form a flywheel circuit. Further, specific examples of the plurality of solenoid drive frequencies include a first solenoid drive frequency and a second solenoid drive frequency. From the first solenoid drive frequency, a smoothing action of the current supplied by the flywheel circuit can be obtained. The second solenoid drive frequency is lower than the first solenoid drive frequency, and the flywheel circuit cannot obtain a smoothing action of the energizing current.

In the control device for the variable displacement compressor used in the vehicle air conditioner, the compressor control means first receives the detected predetermined air conditioning information and vehicle information. The compressor control means outputs a command signal based on each of the received information and an energizing current value received from the current detecting means. This command signal corresponds to the preset conditions of air-conditioning control and compressor load control for opening and closing the capacity control valve. The frequency generator generates and outputs a first solenoid drive frequency and a second solenoid drive frequency. The first solenoid drive frequency corresponds to the air conditioning control command signal. The second solenoid drive frequency has a lower value than the first solenoid drive frequency corresponding to a command signal for compressor load control. The control signal supply means receives command signals for air conditioning control and compressor load control, and selects a control signal corresponding to the received command signal from the output of the frequency generation means. You. This control signal is the first or second solenoid drive frequency and is supplied to the solenoid drive means.

Preferably, the first solenoid drive frequency is set as an on-off valve that operates in response to both the pressure or pressure difference of the refrigerant gas acting on the pressure-sensitive mechanism and the current flowing through the solenoid. Set to a working frequency. The second solenoid drive frequency is set to a frequency that functions as an on-off valve that controls the displacement control valve to two positions, ON and OFF, regardless of the operation of the pressure-sensitive mechanism.

When the vehicle information is the engine speed and the vehicle speed, the compressor control means outputs a compressor load control command signal in a state where at least one of the engine speed and the vehicle speed is equal to or less than a predetermined value. Can be. Further, when the vehicle information is the throttle opening, the compressor load control command signal can be output in a state where the throttle opening is a value outside the predetermined range.

In addition, the compressor control means transmits a compressor load control command signal to the solenoid by driving a solenoid such that a physical quantity representing a compressor load or a compression function force in the variable displacement compressor becomes a predetermined value, or an engine rotation. The number may be output to the control signal supply unit so that the number becomes a predetermined value. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a diagram showing an example of a function block in a conventional vehicle-mounted device, and FIG. 2 is a diagram showing an example of a capacity control valve.

FIG. 3 is a diagram showing an embodiment of a functional block in the vehicle-mounted device of the present invention,

FIG. 4 is a diagram showing details of a part of FIG. 3,

FIG. 5 is a diagram showing one form of an energizing current waveform with respect to a solenoid drive frequency of 400 Hz in FIG. 3,

FIG. 6 is a view showing one form of a suction pressure characteristic of the variable displacement compressor according to the present invention, and

FIG. 7 is a flowchart showing an embodiment of a main operation procedure of the control device in FIG. BEST MODE FOR CARRYING OUT THE INVENTION

The present invention will be described in more detail with reference to the accompanying drawings. FIG. 3 is a diagram showing an embodiment of a function block in a vehicle-mounted device formed according to the present invention.

The illustrated variable displacement compressor control device (hereinafter abbreviated as a control device) 10 receives signals from various sensors 1 and various mode setting switches 2 to optimally control the discharge capacity of the variable displacement compressor 20. The various sensors 1 include, for example, an indoor temperature sensor, a refrigerant temperature sensor, a refrigerant pressure sensor, a vehicle speed detecting unit, an engine speed detecting unit, a throttle opening detecting unit, and the like. The various mode setting switches include, for example, an air conditioning temperature setting switch. A feature of the present invention is that the torque value of the variable displacement compressor 20 is added to the input to the control device 10 and used for controlling the compressor load.

The control device 10 includes a solenoid driving unit 11, a current detection unit 12, a compressor control unit 13, a frequency generation unit 14, a control signal supply unit 15, and a diode 16.

Further, in the control device 10, as shown in FIG. 4, the compressor control means 13 controls the temperature of a predetermined location, the setting of the air conditioning mode in the variable capacity compressor 20 and the control of the variable capacity compressor 20. Input the torque, the engine speed received from the ECU (engine control unit) 31 and the throttle opening, respectively.

Since the variable displacement compressor 20 has the same configuration as the conventional one, the structural description including the displacement control valve 21 for controlling the gas displacement is omitted. The displacement control valve 21 has a valve element 2 12, a pressure-sensitive mechanism 2 13 having a bellows, and a solenoid 2 11. The valve element 212 is provided in the middle of the gas passage, and regulates the flow of gas from the discharge chamber 22 to the crank chamber 23. The pressure sensing mechanism 2 13 detects a change in the gas pressure of the suction chamber 24 with respect to a preset value and transmits the change to the valve element 2 12. The solenoid 211 is provided to change the set value of the pressure-sensitive mechanism 21 to change the load applied to the valve element 212 according to the amount of the supplied current.

The variable displacement compressor 20 has a torque sensor 25 for detecting its own load. Then, the detected torque value is notified to the compressor control means 13 for compressor load control.

In the control device 10, the variable displacement compressor 20 adjusts the opening of the displacement control valve 21 in response to the control of the energized state of the solenoid 21 1, whereby the crank chamber 2 3 connected to the gas passage is opened. The discharge amount is controlled by changing the pressure of the control pressure chamber as described above.

Next, components of the control device 10 will be described with reference to FIGS. 3 and 4. FIG.

The solenoid drive means 11 connects the power line 3 of the vehicle to the solenoid 2 1 1 and drives it. That is, the solenoid driving means 11 is constituted by a switching element, and performs an on-Z-off operation of the connection circuit according to the frequency received. The energizing current flowing through the solenoid 211 is adjusted by changing the duty ratio, which is the ON / OFF ratio of this operation. That is, the conduction current is adjusted by the pulse width modulation method (PWM control). The current detecting means 12 is, for example, a resistor having a known resistance value, and detects a current flowing through the solenoid.

The compressor control means 13 receives detection values of various sensors including the compressor torque value as shown in FIG. 4 described above, and based on the received value and the energized current value received from the current detection means 12. From the information, a command signal for air-conditioning control or compressor control for opening and closing the capacity control valve 21 is output. That is, when the vehicle is traveling normally, a command signal for air conditioning control is output. On the other hand, for example, when the vehicle stops and the vehicle engine 3 ° is in an idling state, a command signal for compressor load control is output. In this case, the air conditioning control is changed to the compressor load control so as to reduce the load on the vehicle engine 30. Further, the gas discharge amount is controlled so that the load of the variable capacity compressor 20 becomes a predetermined value.

The frequency generating means 14 generates and outputs solenoid drive frequencies of 40 OHz for the command signal of the air conditioning control and 10 Hz for the command signal of the compressor load control. The control signal supply means 15 receives a command signal for air conditioning control or a command signal for compressor load control from the compressor control means 13. Further, the control signal supply means 15 selects a solenoid drive frequency corresponding to the received command signal from the output of the frequency generation means 14 and supplies ON / OFF pulses based on the frequency to the solenoid drive means 11. diode Reference numeral 16 denotes a flywheel circuit connected in parallel with the solenoid 211 for smoothing the current flowing through the solenoid 211.

In the solenoid 2 1 1 of the capacity control valve 2 1, one terminal is connected to the power line 3 of the vehicle via the solenoid driving means 11, and the other terminal is connected to the earth line via the current detection circuit 12. Have been. With this circuit configuration, the current flowing through the above-described flywheel circuit is detected by the current detection means 12 and notified to the compressor control means 13.

Next, a circuit operation when the compressor control means 13 generates a command signal for air-conditioning control will be described with reference to FIG. 3, FIG. 5 and FIG.

In the case of this air conditioning control, the control signal supply means 15 outputs a solenoid drive frequency of 400 Hz corresponding to the air conditioning control signal to the solenoid drive means 11. In this frequency region, the current does not rise immediately when the solenoid drive unit 11 is turned “on” because of the inductance of the coil in the solenoid 2 11. Therefore, the solenoid driving means 11 is switched to "OFF" before the current is maximized. Also, even if the current is switched to "OFF", the current is returned by the flywheel circuit formed by the diode 16, and the solenoid driving means 11 is switched to "ON" before the energized current becomes "zero". Therefore, the conduction current is smoothed so as to draw a sawtooth wave as shown in FIG.

Furthermore, by increasing the duty ratio, the ratio of “on” increases, so that the energized current increases. That is, the energizing current can be changed by changing the duty ratio.

Therefore, the valve element 212 functions as an on-off valve that operates in response to the suction pressure acting on the pressure-sensitive mechanism 211 and the current flowing through the solenoid 211 in such a frequency range. That is, as shown in FIG. 6, it functions as a displacement control valve whose control suction pressure is uniquely determined with respect to the supplied current.

When the compressor control means 13 generates a command signal for compressor load control, the solenoid drive frequency is set to “10 Hz”. In other words, in such a frequency region, the current flowing through the solenoid 211 reaches the maximum current determined by the vehicle power supply voltage and the solenoid resistance in the state where the solenoid driving means 11 is in the "ON" state. This state Then, the electromagnetic force of the solenoid 211 becomes maximum, and the valve element 212 of the displacement control valve 21 works in a direction in which it is fully closed regardless of the suction pressure acting on the pressure-sensitive mechanism 213.

On the other hand, when the solenoid driving means 11 changes to the "off" state, the current flowing through the solenoid 2 11 reaches zero. As a result, the solenoid 211 is demagnetized, so that the valve body 212 is forcibly opened by the spring 223 regardless of the suction pressure acting on the pressure-sensitive mechanism 213.

That is, in such a low frequency region, the valve functions as an open / close valve for two-position control of “on” and “off”, and is a so-called “on / off” duty control valve. In the duty control valve, when the duty ratio is “zero”, the current flowing through the solenoid 211 becomes “zero”, the valve body 212 is opened, and the discharge capacity of the compressor is minimized. When the duty ratio is 100%, the current flowing through the solenoid 211 becomes the maximum value, the valve body 212 is fully closed, and the discharge capacity of the variable displacement compressor 20 becomes the maximum. Therefore, by changing the duty ratio from zero to 100%, the discharge capacity can be changed from the minimum to the maximum and set to a predetermined value.

Next, a main operation procedure in the control device 10 of the variable displacement compressor 20 used in the air conditioner will be described with reference to FIG. 3 and FIG.

When the power of the air conditioner is turned on (YES in step S1), the controller 10 generates an air conditioning control command signal when the compressor control means 13 detects that the vehicle is running based on input information, for example, the vehicle speed. (NO in step S2) Then, the control signal supply means 15 is notified. Therefore, the control signal supply means 15 selects the solenoid drive frequency of 400 Hz (procedure S4) in the initial state of the counter “N = 0” (procedure S3). The solenoid driving means 11 receives a pulse having a solenoid driving frequency of 400 Hz selected from the control signal supply means 15. On the other hand, when the suction chamber pressure is set to 2 kg / cm ² G in the normal air-conditioning mode in FIG. 6, for example, the solenoid 211 is driven with a duty ratio that sets the energizing current to the current value i _N. As a result, as described above, in the variable displacement compressor 20, the suction pressure determined by the current value i _N is maintained.

On the other hand, if the above procedure S2 is "YES" and the compressor control means 13 detects, for example, that the vehicle speed is equal to or lower than a predetermined value, the compressor control means 13 generates a compressor load control command signal and generates a control signal. Notify supply means 15. Therefore, the control signal supply means 15 sets “N = 0”. In the initial state (YES in step S11), select the solenoid drive frequency of 10Hz (step S12) and output the duty ratio DT to the solenoid drive means 11 with the preset initial value DT0 ( Step S13). The solenoid drive means 11 is driven by a pulse having a duty ratio DT at a solenoid drive frequency of 1 OHz selected from the control signal supply means 15.

Here, the compressor control means 13 controls the discharge capacity so that the torque value of the variable compressor 20 is within a range that is larger than “T2” and smaller than “Τ1”.

Therefore, the compressor control means 13 measures the torque value の of the variable compressor 20 (step S 1

4) Yes. As a result of the measurement, when the compressor torque is smaller than “Τ1” (YES in step S15) and when the compressor torque is larger than “T2” (ΥΕ in step S16)

In step 5), the duty ratio DT being set is not changed (step S17), the output is maintained (step S18), and the current discharge capacity control state is maintained, and the counter Ν is incremented by one. (Step S19), and returns to Step S1 above, and the procedure is repeated. If the compressor torque is greater than “Τ1” in the above procedure S15 Force S “ΝΟ”, the compressor control means 13 reduces the preset predetermined value ADT from the duty ratio DT being set (procedure S21) Then, proceed to the above step S18. Therefore, the reduced duty ratio D Τ is set, so that the displacement is reduced and the compressor torque is also reduced. On the other hand, if the compressor torque is smaller than “Τ2” in the above procedure S16 force S “ΝΟ”, the compressor control means 13 changes the duty ratio DT being set to the predetermined value ADT. Increase (step S22) and proceed to step S18. Therefore, the increased duty ratio DT is set, so that the displacement is increased and the compressor torque is also increased. Thus, control is performed so that the compressor torque 内 falls within a predetermined range.

In the above description, the compressor control means generates a command signal for compressor load control when the vehicle speed is equal to or lower than a predetermined value. However, the engine speed may be used instead of the vehicle speed. In this case, the load on the vehicle engine during low rotation is reduced, and in this state, stoppage due to overload of the vehicle engine is avoided. Further, a command signal for compressor load control may be generated when both the vehicle speed and the engine speed become equal to or less than predetermined values.

Furthermore, in the above description, only two are taken as command or control signals. However, since the output value of other various sensors can be controlled to a predetermined value, control can be performed for a wide variety of applications.

So far, the load control of the variable displacement compressor used in the vehicle air conditioner has been described. However, as long as the above functions are satisfied, the function block configuration and operation procedure can be freely changed, and the present invention is limited by the above description. It is not what is done. Further, as described above, the present invention can be applied to all devices that move a piston or plunger by discharging and inhaling gas. Industrial applicability

As described above, according to the variable displacement compressor control device of the present invention, the solenoid drive frequency is selectively changed to drive the solenoid of the displacement control valve. The effect is obtained that the characteristics of the control valve can be changed.

In addition, since the solenoid of the displacement control valve forms a flywheel circuit, at the solenoid drive frequency at which the conduction current can be smoothed, the pressure or pressure difference acting on the pressure-sensitive mechanism and the current flowing through the solenoid are different. The effect of being able to function as a suitable capacity control valve for air conditioning control that operates in response to both is obtained.

On the other hand, although the solenoid of the displacement control valve forms a flywheel circuit, with a low solenoid drive frequency that does not provide a smoothing action of the energizing current, the capacity of the two-position control of on / off independent of the pressure-sensitive mechanism The effect of functioning as a control valve is obtained. Therefore, versatile control can be performed by various sensors or detecting means mounted on the vehicle.

In other words, with the on / off two-position control capacity control valve, the compressor load can be controlled by various sensors or detection means, minimizing the sacrifice of air conditioning control and stabilizing vehicle engine control. The effect that it can be achieved is obtained. Further, since the compressor load control can be performed only in the idling state, the acceleration state, or the deceleration state, there is obtained an effect that there is little area where air conditioning control is sacrificed. Therefore, as described above, the control device for a variable displacement compressor according to the present invention is particularly suitable for mounting on a vehicle in addition to controlling various mode settings for general air conditioning equipment. It is suitable for fine-grained air-conditioning control, taking into account the load of the onboard power supply unit, like the air-conditioning equipment installed. That is, it is easy to set the control conditions such as the vehicle speed, the engine speed, or the degree of opening and closing of the throttle.

Claims

The scope of the claims

1. A control device for a variable displacement compressor having a displacement control valve, wherein the displacement control valve is configured to transmit a change in refrigerant pressure or a difference in refrigerant pressure to a valve body according to a pressure-sensitive mechanism and an input current. A solenoid for changing a setting of the pressure-sensitive mechanism by changing a load applied to the valve body, wherein the control device controls an energized state of the solenoid to open the capacity control valve. Controlling the discharge capacity of the displacement control valve by changing the pressure of the control pressure chamber.

A solenoid driving means for driving the solenoid,

Current detection means for detecting the current flowing through the solenoid; and a plurality of control requirements; presetting the opening and closing of the capacity control valve based on the received control requirements and a current value received from the current detection means. Compressor control means for outputting a command signal for the plurality of controls performed,

Frequency generating means for generating and outputting a solenoid drive frequency corresponding to each of the plurality of command signals;

Control signal supply means for receiving one of the plurality of command signals, selecting a solenoid drive frequency corresponding to the received command signal from an output of the frequency generation means, and supplying the selected drive signal as a control signal to the solenoid drive means When

A control device for a variable displacement compressor, comprising:

2. The device according to claim 1, further comprising a diode connected in parallel to the solenoid to form a flywheel circuit,

As the solenoid drive frequency, a first solenoid drive frequency at which a smoothing action of the current supplied by the flywheel circuit is obtained; and A variable displacement compressor characterized by having a second solenoid drive frequency.

3. A control device for a variable displacement compressor having a displacement control valve, wherein the displacement control valve is configured to transmit a change in refrigerant pressure or a difference in refrigerant pressure to a valve body in accordance with a pressure-sensitive mechanism and an input current. Change the setting of the pressure-sensitive mechanism by changing the load applied to the valve body. The control device controls the energization state of the solenoid to adjust the opening of the capacity control valve, and changes the pressure of the control pressure chamber to control the capacity of the capacity control valve. Controlling the discharge capacity, wherein the control device comprises:

A solenoid driving means for driving the solenoid,

Current detecting means for detecting a current supplied to the solenoid,

Air-conditioning control and compressor load preset for opening and closing the capacity control valve based on the detected predetermined air-conditioning information and vehicle information, and based on each of the received information and an energizing current value received from the current detecting means. Compressor control means for outputting a command signal corresponding to control conditions;

Frequency generating means for generating and outputting a first solenoid drive frequency corresponding to a command signal for air conditioning control and a second solenoid drive frequency lower than the first solenoid drive frequency corresponding to a command signal for compressor load control; ,

A command signal for the air conditioning control and the compressor load control is received, and one of the first and second solenoid driving frequencies corresponding to the received command signal is selected as a control signal from the output of the frequency generating means. Means for supplying a control signal to the solenoid driving means;

A control device for a variable displacement compressor, comprising:

4. In claim 3, the first solenoid drive frequency is determined by both the pressure or the pressure difference of the refrigerant gas acting on the pressure-sensitive mechanism by the displacement control valve and the current flowing through the solenoid. The second solenoid drive frequency is set to a frequency of on and off irrespective of the operation of the pressure-sensitive mechanism. A control device for a variable displacement compressor, characterized in that the control device is set to a frequency that functions as an on-off valve that controls two positions.

5. The vehicle according to claim 3 or 4, wherein the vehicle information is an engine speed and a vehicle speed, and the compressor control unit outputs a command signal for compressor load control, and at least one of the engine speed and the vehicle speed is a predetermined value. A control device for a variable displacement compressor, which outputs when:

6. The vehicle according to claim 3 or 4, wherein the vehicle information is a throttle opening, and the compressor control means outputs a command signal for compressor load control, and the throttle opening is within a predetermined range. A control device for a variable displacement compressor, which outputs a value when the value is out of range.

7. The compressor according to any one of claims 3 to 6, wherein the compressor control means comprises: a compressor load control command signal; and a compressor load and a compression in the variable displacement compressor by driving the solenoid. Controlling the variable displacement compressor so that a physical quantity representing any of the functional capabilities is output to the control signal supply means so as to be a predetermined value.

8. The compressor according to any one of claims 3 to 6, wherein the compressor control means outputs a command signal for compressor load control such that the solenoid is driven so that the engine speed becomes a predetermined value. A control device for a variable capacity compressor, which outputs the control signal to the control signal supply means.