JPH0926214A - Controller of air conditioner in electric automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To relieve the rider of an electric automobile from annoyance by the noise produced when an electronic expansion valve is reset to zero. SOLUTION: When a secondary battery 25 is charged, an air-conditioning ECU 26 puts electronic expansion valves 19, 20 in a full-closed state, that is, to a base position, and sets the cumulative pulse number to the electronic expansion valves 19, 20 at zero. There is no possibility of the noise being felt annoying when the electronic expansion valves 19, 20 are reset to their base positions, since the rider usually is out of the vehicle during charging of the battery or even if the rider is in, the charger is in action and evolves its operating noise while the secondary battery 25 is being charged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a controller for an air conditioner for an electric vehicle, which controls an air conditioner operated by receiving power from a secondary battery mounted in the electric vehicle.
In particular, the present invention relates to a device having a function of setting a flow control valve for adjusting the flow rate of the refrigerant in the refrigerant circuit at the reference position when the secondary battery is charged.

[0002]

2. Description of the Related Art For an electronic expansion valve (flow control valve) driven by a step motor, if the correspondence between the valve opening and the cumulative pulse number input so far is lost, the opening control is performed. Becomes inaccurate. In such a case, as a means for ensuring the correspondence between the valve opening and the cumulative pulse number by adjusting the opening of the electronic expansion valve to zero, there is disclosed in Japanese Unexamined Patent Publication No. 5-346279.
There is a technique disclosed in Japanese Unexamined Patent Publication (Kokai) No. H11-26095.

This is because when the correspondence between the valve opening of the electronic expansion valve and the cumulative number of pulses is lost and a large deviation occurs between the opening command and the actual opening of the electronic expansion valve, the compressor is opened. Since the discharge temperature becomes high, abnormality detecting means for detecting this is provided, and when the abnormality detecting means detects an abnormality, the setting operation command means outputs a reference position setting operation command to the opening degree control means. As a result, the electronic expansion valve is driven to the fully closed position which is the reference position, so that the zero point adjustment of the cumulative pulse number is performed at this fully closed position, and thereafter the opening control is performed with the fully closed position as a reference. , Is.

[0004]

In a refrigeration cycle used in an air conditioner, an expansion valve (flow control valve) has a function of supplying an appropriate amount of refrigerant to an evaporator according to a cooling load. As such an expansion valve, in recent years, an electronic expansion valve using a step motor as a drive source has been widely adopted in consideration of control certainty. In this electronic expansion valve, since the rotation angle of the step motor has a correspondence relationship with the input pulse number, the valve opening degree is changed stepwise according to the input pulse number.

By the way, the valve opening degree of the electronic expansion valve at a certain time should correspond to the cumulative pulse number inputted up to that point, but when the valve is caught during the opening / closing operation, etc. Then, the correspondence between the valve opening degree and the cumulative pulse number is lost. Therefore, in the conventional air conditioner, when a certain operating time has passed, the electronic expansion valve is once fully closed to adjust the valve opening to zero, and the opening control means issues a command from the fully closed position. The valve is designed to open up to the opening.

In the air conditioner of an electric vehicle, an electronic expansion valve is used for the refrigeration cycle. In a conventional electric vehicle, each time the air conditioner starts to operate, the electronic expansion valve is fully closed and the cumulative number of pulses at that time is adjusted to zero (hereinafter, zero point adjustment) to open the valve. The correspondence between the frequency and the number of input pulses is ensured. In this case, if the electronic expansion valve is set to operate from the fully open position to the fully closed position with 700 pulses, for example, the electronic expansion valve has a 700 Input pulse. Therefore, if the zero point adjustment is performed when the valve opening is in the half open state, pulse input is performed even after the valve reaches the fully closed position and contacts the stopper, and the step motor will rotate. Therefore, the valve makes a clicking noise when it hits the stopper.

As described above, the zero adjustment of the electronic expansion valve is performed when the operation of the air conditioner is started, that is, when the occupant is in the passenger compartment. , The above abnormal noise feels very noisy. The present invention has been made in view of the above circumstances, and an object thereof is to provide an air conditioner for an electric vehicle in which an occupant of the electric vehicle does not feel annoying noise even if the flow control valve makes an abnormal noise when adjusting the zero point. To provide a control device for the device.

[0008]

In order to achieve the above object, the present invention is an air conditioner equipped with a refrigerant circuit and a flow control valve for adjusting the refrigerant flow rate of the refrigerant circuit, which is mounted on an electric vehicle. In a control device for an air conditioner for an electric vehicle that controls an air conditioner that is operated by receiving power from a secondary battery, a charge detection unit that detects charging of the secondary battery and an opening degree of the flow control valve are set. Opening control means for controlling, and main control means for causing the opening control means to perform a reference position setting operation for setting the flow rate control valve to a reference position when the charging detection means detects charging. It is equipped with.

When charging the secondary battery, the charger operates,
The operation sound is generated. In addition, when charging, the occupant is normally carried out while not in the vehicle. In the present invention having the above-described configuration, the zero point adjustment of the flow control valve is performed at the time of charging such a secondary battery.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. First, the schematic configuration of the entire air conditioner 1 will be described with reference to FIG. On the upstream side of the blower case 2,
An outside air suction port 3 for sucking air (outside air) outside the vehicle compartment and an inside air suction port 4 for sucking air (inside air) inside the vehicle compartment are provided. At an intermediate portion between the outside air intake port 3 and the inside air intake port 4,
The inside / outside air damper 5 is provided, and the opening ratio of the inside / outside air damper 5 is adjusted by a servo motor (not shown) to change the mixing ratio of the air sucked from the outside air intake port 3 and the inside air intake port 4 to change the intake air temperature. It is supposed to be adjusted. A blower 6, which is a blower, is provided on the downstream side of the outside air intake port 3 and the inside air intake port 4.
Is attached to the rotary shaft of the blower motor 7.

On the other hand, an evaporator 8 is arranged on the downstream side of the blower 6, and a condenser 9 as an indoor heat exchanger is arranged on the downstream side of the evaporator 8. Air mix dampers 10 are arranged in the passages on both sides of the capacitor 9, and the air mix damper 10 is driven by a servo motor (not shown) to generate the capacitor 9
It is possible to adjust the ratio of the air volume that passes through and the air volume that bypasses the condenser 9. And
The wind that has passed through the condenser 9 and the wind that has bypassed the condenser 9 are mixed downstream of the condenser 9 to become conditioned air of a desired temperature, and are blown into the vehicle interior from the air outlet 11.

On the other hand, the evaporator 8 and the condenser 9 are components of a refrigerating cycle which is a refrigerant circuit, that is, a refrigerating cycle 12 which is a heat pump in this embodiment. The refrigeration cycle 12 includes a compressor 13, an electromagnetic four-way switching valve 14, check valves 15 and 16, an outdoor heat exchanger 17, an electromagnetic valve 18 as an on-off valve, an electronic expansion valve 19 for cooling as a flow rate control valve, and a flow rate. An electronic expansion valve for heating 20 as a control valve, an accumulator 21, the evaporator 8 and a condenser 9 are connected by piping.

The expansion valves 19 and 20 are driven by a step motor, and the valve opening can be adjusted by controlling the number of input pulses to the step motor. There is. And the electromagnetic four-way switching valve 1
4, the open / close states of the electromagnetic valve 18, the cooling electronic expansion valve 19 and the heating electronic expansion valve 20 are switched as shown in Table 1 below according to the operation mode of the refrigeration cycle 12.

[0014]

[Table 1]

As is clear from Table 1, in the cooling mode, the electromagnetic four-way switching valve 14 is switched to the position shown by the solid line in FIG. 2, and the refrigerant discharged from the discharge port 13a of the compressor 13 is checked by the check valve. 15 → outdoor heat exchanger 17 → cooling electronic expansion valve 19 → evaporator 8 → accumulator 2
1 → circulates in the path of the suction port 13b of the compressor 13. As a result, the high-temperature gas refrigerant discharged from the discharge port 13a of the compressor 13 radiates heat in the outdoor heat exchanger 17 and is liquefied, and this liquid refrigerant is evaporated in the evaporator 8 to cool the wind passing through the evaporator 31. It At this time, the electronic expansion valve for cooling 19 is adjusted to an opening degree according to the thermal load of the evaporator 8 and supplies an appropriate amount of refrigerant to the evaporator 8.

On the other hand, in the heating mode, the electromagnetic four-way switching valve 1
2 is switched to the position shown by the broken line in FIG. 2, and the refrigerant discharged from the discharge port 13a of the compressor 13 is changed from the condenser 9 to the heating electronic expansion valve 20 to the check valve 16 to the outdoor heat exchanger 17 to the solenoid valve. 18 → accumulator 21 → circulates in the path of the suction port 13b of the compressor 13. As a result, the high temperature gas refrigerant discharged from the discharge port 13a of the compressor 13 radiates heat and liquefies in the condenser 9, and the heat radiation warms the wind passing through the condenser 9. At this time, the heating electronic expansion valve 20 is adjusted to an opening degree according to the thermal load of the condenser 9 so that an appropriate amount of refrigerant is supplied to the condenser 9.

In the defrosting mode, the refrigerant circulates in the same route as in the cooling mode described above, and the high temperature gas refrigerant discharged from the discharge port 13a of the compressor 13 radiates heat in the outdoor heat exchanger 17, thereby the outdoor Frost adhering to the surface of the heat exchanger 17 is removed.

Further, in the dehumidifying mode, the electromagnetic four-way switching valve 1
2 is a position shown by a broken line in FIG. 2, the electromagnetic valve 18 is closed, the electronic expansion valve 19 for cooling and the electronic expansion valve 20 for heating are opened, so that the refrigerant discharged from the discharge port 13a of the compressor 13 is Capacitor 9-> electronic expansion valve 20 for heating
→ check valve 16 → outdoor heat exchanger 17 → electronic expansion valve for cooling 1
9 → evaporator 8 → accumulator 21 → compressor 13 circulates in a path of suction port 13b. This allows
When the wind passing through the blower case 2 passes through the evaporator 8, it is cooled and dehumidified. The cooled and dehumidified air is reheated by the condenser 9 and becomes conditioned air of a desired temperature and is blown out from the air outlet 11.

The outdoor heat exchanger 17 is provided with an outdoor fan 22 for forced cooling. The fan motor 22a of the outdoor fan 22 operates at high speed depending on the operation mode of the refrigeration cycle 12 and output data of various sensors described later. Rotation "H
i ", low speed rotation" Lo ", and stop" OFF ". For example, in the cooling mode, the outside air temperature Tam becomes" Hi "at 25 ° C or higher and" Lo "at 22 ° C or lower. On the other hand, in heating mode, outside temperature Tam
Becomes "Hi" below 13 ℃, and "Lo" above 16 ℃
Becomes In the dehumidifying H mode, the air temperature Te immediately after passing through the evaporator 8 is “OFF” at 4 ° C. or higher, “Hi” at 2 ° C. or lower, and “L” in the range of 3 ° C. → 4 ° C. and 3 ° C. → 2 ° C.
In addition, in the dehumidification C mode, the compressor 1
The refrigerant discharge pressure Pd of 3 and the refrigerant discharge temperature Td of the compressor 13 determine the priority order of Hi>Lo> OFF. For example, the refrigerant discharge pressure Pd is 19 kgf / cm2
If it is G or more, it is always "Hi" regardless of the value of Td.

On the other hand, the compressor 1 of the refrigeration cycle 12
The motor 23 that drives 3 is driven by the inverter 24. The inverter 24 is, for example, 200 to 300 supplied from a secondary battery 25 which is a power source for driving a vehicle.
The DC power of V is converted into AC power, and the rotation frequency of the compressor motor 23 is controlled by the AC frequency. The inverter 24, the servomotor for the inside / outside air damper 5, the blower motor 7, and the air mix damper 10 described above.
The servo motor, the electromagnetic four-way switching valve 14, the electromagnetic valve 18, the electronic expansion valve 19 for cooling, the electronic expansion valve 20 for heating, and the fan motor 22a of the outdoor fan 22 are electronic control units for air conditioning (hereinafter referred to as "air conditioning control means"). "Air conditioning ECU")
26.

Although not shown, the dashboard of the electric vehicle is provided with a control panel of the air conditioner 1, and a mode setter for setting the operation mode of the refrigeration cycle 12 and the air conditioning temperature on the control panel. And a temperature setting device are provided. The contents set by the mode setter and the temperature setter are input to the air conditioning ECU 26 as mode signals and temperature signals from the mode setter and the temperature setter.

The electric vehicle is equipped with an auxiliary secondary battery 27 in addition to the secondary battery (hereinafter referred to as main secondary battery) 25 for driving the vehicle, and the air conditioning ECU 26 uses the auxiliary secondary battery 27 as a power source. Operate. Then, as shown in FIG. 3, the main secondary battery 25 is charged by an external power supply 29 through a charging circuit 28 as a charging means. In addition, the auxiliary secondary battery 27 is the DC output of the charging circuit 28 or the main secondary battery 25.
1 by the DC output of the DC / DC converter 30
It is stepped down to 2V and charged.

The above charging circuit 28 is controlled by a charging control circuit 31 which is a charging control means. The charging current flowing into the main secondary battery 25 during charging is detected by the current sensor 32, and the detection signal is input to the charging control circuit 31. The charging control circuit 31 detects the detection signal of the current sensor 32. The charging current and charging voltage are controlled to appropriate values based on the above. Then, the charging control circuit 31 causes the EC for air conditioning to be ready when the charging of the main secondary battery 25 progresses to some extent.
It is configured to give an air conditioning operation permission signal to U26.

As shown in FIG. 4, the air conditioning ECU 26 is mainly composed of a microcomputer unit (hereinafter referred to as “MCU”) 33, and the MCU 33 is
It is configured to include a RAM for temporarily storing various data and the like, a ROM for storing a control program and the like, a peripheral module such as an A / D converter for converting input data into a digital value, and its input / output unit is Input interface 3
4 and an output interface 35. Then, as the entire air conditioning ECU 26, the MCU 3
3, an input interface 34, an output interface 35, a power supply circuit 36, a reset signal generation circuit 3
7 and a starting circuit 38 as starting means.

As shown in FIG. 4, the air conditioning ECU 26 is configured to receive the voltage from the auxiliary secondary battery 27 through three paths. The configuration will be described below. That is, the air conditioning ECU 26 has a voltage input terminal (CH • B) 26a via a charge switch, a voltage input terminal (IG • B) 26b via an ignition, a battery voltage input terminal (+ B) 26c, and a ground terminal 26d. The voltage input terminal 26a via the charge switch is connected to the 12V power supply terminal of the auxiliary secondary battery 27 via the charge switch 39 that is turned on by the charge control circuit 31 during the charge control of the charge control circuit 31, and the ignition voltage input The terminal 26b is connected to the 12V power supply terminal of the auxiliary secondary battery 27 via the ignition switch 40, and the battery voltage input terminal 26c is the auxiliary secondary battery 27.
Is directly connected to the 12V power supply terminal, and the ground terminal is connected to the 0V power supply terminal of the auxiliary secondary battery 27.

On the other hand, the power supply circuit 36 is connected to the battery voltage input terminal 26c through the diode 41 having the polarity shown in the figure, and converts the 12V voltage from the auxiliary secondary battery 27 into a 5V voltage to reset signal generating circuit 37. , The input interface 34, the output interface 35, the start-up circuit 38, and the Vcc terminal of the MCU 33.

The reset signal generating circuit 37 includes a power supply circuit 3
A low-level reset signal is output to the reset terminal of the MCU 33 in the unstable state of the 5V voltage supplied from 6, and the output of the reset signal is released in the stable state of the 5V voltage. This reset signal generating circuit 37
Has a watchdog function, and when a pulse signal is not output from the output port P1 of the MCU 33 within a predetermined time, a reset signal is output to forcibly reset the MCU 33.

An input interface 34, an output interface 35, a reset signal generating circuit 37, and a starting circuit 38 are connected to the voltage input terminal 26a via the charge switch and the voltage input terminal 26b via the ignition switch via diodes 42 and 43 having the polarities shown in the figure. It is connected.

The input interface 34 includes an inside air temperature sensor for detecting the temperature inside the vehicle compartment, an outside air temperature sensor for detecting the outside temperature of the vehicle, an evaporator outlet temperature sensor for detecting the wind temperature after passing through the evaporator 8, and a refrigerant discharge from the compressor 13. A pressure sensor for detecting the pressure, a temperature setter for the occupant to set the air conditioning temperature, an outdoor heat exchanger temperature sensor for detecting the temperature of the outdoor heat exchanger 17 (all not shown),
Various signals from the mode setter and temperature setter of the control panel are output to the MCU 33 in a state where the signal level and the communication timing are matched, and the output interface 35 outputs the data input from the MCU 33 to the signal level and the communication timing. Servo motors or fan motors 22a of the dampers 5 and 10 in the aligned state,
It outputs to the inverter 24, the electronic four-way switching valve 14, the solenoid valve 18, the cooling electronic expansion valve 19, the heating electronic expansion valve 20, and the like. The input interface 34 and the output interface 35 operate in the high level state of the select terminal S, and are in a high impedance and low power consumption state when the selector terminal is in a low level state.

The starting circuit 38 is constructed by combining first to third transistors 44 to 46. That is, in the first transistor 44, the base is connected to the output sides of the diodes 42 and 43 via the resistor 47, and the emitter is connected to the ground terminal 26d. In the second transistor 45, the base is connected to the MCU 3 via the resistor 48.
3 is connected to the output port P2, and the emitter is connected to the ground terminal 26d. In the third transistor 46, the emitter is connected to the output terminal of the power supply circuit 36, the base is commonly connected to the collectors of the first and second transistors 44 and 45 via the resistor 49, and the collector is the standby terminal of the MCU 33. It is connected.

Here, the MCU 33 resets the pulse signal from the output port P1 within a predetermined time when the voltage of 12V is input from the voltage input terminal 26a via the charge switch or the voltage input terminal 26b via the ignition switch. The high level signal is output from the output port P2 to the base of the second transistor 45 while being output to the signal generating circuit 37.

The start-up circuit 38 having the above-described structure is configured to turn on the third transistor when the first or second transistor 44 or 45 is turned on.
Transistor 46 turns on and outputs a 5V voltage (hereinafter referred to as S5V signal) in the on state. Also, the first
The third transistor 46 is turned off when the second transistors 44 and 45 are off, and the output is in a high impedance state when the third transistor 46 is off.

In this case, since the reset terminal and the standby terminal of the MCU 33 are pulled down to the ground, when the outputs of the reset signal generating circuit 37 and the starting circuit 38 are in the high impedance state, those terminals are maintained at the low level. It Also, the input interface 3
4 and the output interface 35 are configured such that the high level S5V signal output from the third transistor 46 of the activation circuit 38 is input to the select terminal S and is activated in the input state. .

In the MCU 33, the reset terminal is at a high level (the reset signal generating circuit 3
7 is in the non-output state of the reset signal) and the standby terminal is at the high level (the output state of the S5V signal from the startup circuit 38), and when the reset terminal is at the low level, the reset state is set and the standby terminal is When it is low level, it enters the hardware standby mode (low power consumption state) in which the functions of on-chip peripheral modules stop.

In this case, although the built-in peripheral module of the MCU 33 is in the reset state, as long as 5 V is supplied to the Vcc terminal of the MCU 33, the data in the RAM is retained and the input / output ports of the MCU 33 are in the high impedance state. Become. In addition, S5V from the starting circuit 38
When the signal is cut off, the input interface 34 and the output interface 35 are also stopped to enter the low power consumption state, so that the power consumption of the entire air conditioning ECU 26 is significantly reduced.

When the auxiliary secondary battery 27 is installed in an electric vehicle, power is supplied from the auxiliary secondary battery 27 to the power supply circuit 36 via the battery voltage input terminal 26a, so that 5V is applied to the Vcc terminal of the MCU 33. Is being powered.
Then, in a normal state, that is, in a state where both the charge switch 39 and the ignition switch 40 are turned off and the voltage of the auxiliary secondary battery 27 is received only from the battery voltage input terminal 26a, the third transistor 46 of the starting circuit 38 is provided. Is off. As a result, the S5V signal from the starting circuit 38 is in the non-output state,
The signal level of the standby terminal of the MCU 33 becomes low level, and accordingly, the MCU 33 is in the hardware standby mode and the input interface 34
The output interface 35 is also in the low power consumption state. Therefore, the entire air conditioning ECU 26 is in a low power consumption state.

As described above, although the air conditioning ECU 26 is normally in the low power consumption state, it is activated when the following operations or predetermined conditions are satisfied, and the air conditioning ECU 2 is activated.
The original operation of No. 6 is executed. [1] When the user turns on the ignition switch 40 to drive the electric vehicle ... The auxiliary secondary battery 27 through the ignition switch 40.
Is applied to the input interface 34 and the output interface 35, and a high-level signal is output from the output port P2. Therefore, the select terminals S of the input interface 34 and the output interface 35 are selected.
Becomes a high level and these operate out of the low power consumption state. In addition, since the 12V voltage from the auxiliary secondary battery 27 is applied to the base of the first transistor 44 of the starting circuit 38, the first transistor 44 of the starting circuit 38.
Is turned on, the third transistor 46 is turned on in response to the turning on, and the S5V signal is output from the starting circuit 38.

As a result, the standby terminal of the MCU 33 goes high and the hardware standby mode of the MCU 33 is released. As a result, the air conditioning ECU 26
The entire low power consumption state is released. At this time, the reset signal generation circuit 37 stops the output of the reset signal in response to the power supply of 12V, so that the MCU 33 is activated and the air conditioning ECU 26 starts the original operation.

[2] When the user charges the electric vehicle ... During charging, the charge control circuit 31 detects the charge and turns on the charge switch 39. Therefore, the air conditioning ECU 26 is supplied through the voltage input terminal 26b via the charge switch. Is supplied with a 12V voltage. As a result, the MC of the air conditioning ECU 26
The U33 is activated by releasing the hardware standby mode state by the activation circuit 38, similarly to when the ignition switch 40 is turned on.

When charging is completed, the charge control circuit 31 confirms that the charge switch 39 is turned off, and then a low level signal is output from the output port P2. As a result, the second transistor 46 of the starter circuit 38 and thus the third transistor 47 are turned off, so that the standby terminal of the MCU 33 becomes low level,
The MCU 33 shifts to the hardware standby mode state, and the input interface 34 and the output interface 35 are set to the high impedance state. Therefore,
The entire air conditioning ECU 26 is in a low power consumption state.

When charging is completed, the charge control circuit 31 turns off the charge switch 39, and the air conditioning ECU
26 shifts to the hardware standby mode state, whereby the air conditioning ECU 26 enters a low power consumption state.

When the ignition switch 40 is turned on or the charge switch 39 is turned on by charging as described above, the reset signal is released and the MCU 33 is activated. Then, the MCU 33
The control program shown in FIG. 1 is executed.

That is, when the reset signal is released,
First, in step S1 of FIG. 1, the MCU 33 turns on the battery voltage input terminal (+ B) 26c and then turns on the charge switch via voltage input terminal (CH.B) 26a or the ignition switch via voltage input terminal (IG.
B) It is determined whether 26a is turned on (charge switch 39 or ignition switch 40 is turned on). It should be noted that when the battery voltage input terminal 26c is turned on, the auxiliary rechargeable battery 27 is mounted on a new vehicle for the first time, or the old auxiliary rechargeable battery 27 is replaced with a new one and the 12V terminal and the 0V
The terminals are the battery voltage input terminal 26c and the ground terminal 2
When connected to 6d.

Now, assuming that the ignition switch 40 is turned on for the first time after the battery voltage input terminal 26c is turned on, the MCU 33 returns "YES" in step S1.
Then, the process proceeds to step S2, where the electronic expansion valve for cooling 19 and the electronic expansion valve for heating 20 are caused to operate the reference position setting signal. This reference position setting operation is performed by the MCU 33, which is the opening control means, giving a reference position setting command signal to the output interface 35.

Then, the output interface 35 causes the step motor drive circuit of the electronic expansion valve 19 for cooling and the electronic expansion valve 20 for heating to have the necessary number of pulses (for example, 700) to operate the valves from the fully open position to the fully closed position. Give a command to output pulse). As a result, the electronic expansion valve for cooling 1
9. The heating electronic expansion valve 20 is reliably in the fully closed state regardless of whether it is in the half open state or in the fully open position (t0 in FIG. 5).
Between ~ t1). Then, the MCU 33 sets the cumulative number of pulses to the cooling electronic expansion valve 19 and the heating electronic expansion valve 20 to zero. As a result, the correspondence between the valve opening degree of both electronic expansion valves 19 and 20 and the cumulative pulse number is secured.

At this time, when the reference position setting operation is performed with the cooling electronic expansion valve 19 and the heating electronic expansion valve 20 in the half-open state, the electronic expansion valves 19 and 20 are fully closed during the pulse input. Then, the step motor tries to rotate while the valve is in contact with the stopper at the fully closed position, so that a "clicking" sound is generated when the valve strikes the stopper. However, since the auxiliary rechargeable battery 27 is mounted on a new vehicle or the auxiliary rechargeable battery 27 is replaced at the factory, the subsequent turning on of the ignition switch 40 is mostly for a trial run by an operator. Even if a clicking sound is generated during the reference position setting operation, there is no problem. In addition, during the reference position setting operation, the electronic expansion valve 19 for cooling and the electronic expansion valve 20 for heating
A pulse of 700 or more may be applied to the valve to ensure that the valve is closed even if the valve is caught during the operation.

If the ignition switch 40 is not turned on for the first time after the battery voltage input terminal 26c is turned on, the MCU 33 turns "NO" in step S1 and proceeds to step S3. In this step S3, the MCU 33 determines whether or not the voltage input terminal 26a via the charge switch has been switched from off to on. However, since the charge switch 39 is in the off state here,
When it is determined to be "NO", the process proceeds to the next step S4, and it is determined whether or not the voltage input terminal 26a via the charge switch is in the ON state. Similarly in this step S4, the MCU 33 determines "NO", and proceeds to step S5 for determining whether or not the ignition switch via voltage input terminal 26b is in the ON state.

Here, since the MCU 33 is activated by turning on the ignition switch 40, the voltage input terminal 26a via the charge switch is in the on state, so the MCU 33 determines "YES" in the above step S5, and the next step If the operation mode of the refrigeration cycle 12 is set to one of the modes by the mode setter by shifting to step S6, normal air conditioning control for operating the air conditioner 1 in that mode is started, and then step S3. ~ 6
It becomes a state to repeatedly execute.

In the above normal air conditioning control, as shown in FIG. 5, in the heating operation mode, the cooling electronic expansion valve 19 is fully closed and the heating electronic expansion valve 20 is set to MC.
The opening control function of U33 controls the opening according to the thermal load of the condenser 9. In the dehumidifying mode, the electronic expansion valve 19 for cooling and the electronic expansion valve 20 for heating are operated by the evaporator 8,
The opening degree is controlled according to the thermal load of the condenser 9, and in the cooling mode, the heating electronic expansion valve 20 is fully closed,
The electronic expansion valve 19 for cooling is controlled to have an opening degree according to the thermal load of the evaporator 8. Although not shown in FIG. 5, in the defrosting mode, as in the cooling mode, the heating electronic expansion valve 20 is fully closed and the opening degree of the cooling electronic expansion valve 19 is controlled. At this time, since the opening degrees of the cooling electronic expansion valve 19 and the heating electronic expansion valve 20 are controlled by the cumulative number of pulses from the zero point set by the reference position setting operation, the opening control should be performed accurately. You can

By the way, when the electromagnetic four-way switching valve 14 performs a switching operation, that is, when switching between the heating mode, the dehumidifying mode, the cooling mode and the defrosting mode,
The MCU 33 once fully opens the electronic expansion valve 19 for cooling and the electronic expansion valve 20 for heating (t4 to t5, t6 to t6 in FIG. 5).
t7) After that, the open / close state is set according to each mode. In this case, the MCU 33 lengthens the input interval of the pulse signal to both the electronic expansion valves 19 and 20 so that the full opening operation is performed slowly. Thus, the reason why the electronic expansion valves 19, 20 are fully opened when the electromagnetic four-way switching valve 14 is switched is that the inlet side conduit and the outlet side conduit of the electronic expansion valve 19, 20 are switched when the electromagnetic four-way switching valve 14 is switched. Since the pressure difference is large, the pressure difference is quickly eliminated to balance the pressure. The reason why the electronic expansion valves 19, 20 are fully opened at this time is the reason why the electronic expansion valves 19, 2 are slowly opened.
This is because when the 0 is suddenly or momentarily fully opened, the pipe line suddenly becomes a low pressure and a loud noise is generated.

Further, by making the electronic expansion valves 19 and 20 fully open, when the valve opening deviates from the normal position in the opening direction, this can be eliminated, and the reference position in the fully open state can be eliminated. It becomes possible to set.

When the ignition switch 40 is turned off, the MCU 33 determines "NO" in step S5 to stop the operation of the air conditioner 1, and proceeds to step S7. Then, the MCU 33 enters the low power consumption state after fully opening the cooling electronic expansion valve 19 and the heating electronic expansion valve 20 (t8 to t9 in FIG. 5) in step S7. This is because the output of the high level signal from the output terminal P2 is stopped, so that the S5V signal is cut off by the activation circuit 38 being turned off and the MCU 33 enters the hardware standby state.

When the ignition switch 40 is turned off, the cooling electronic expansion valve 19 and the heating electronic expansion valve 20 are fully opened as described above, so that the pressure of the refrigeration cycle 12 is quickly balanced. Therefore, even if the ignition switch 40 is turned on again to operate the air conditioner 1 immediately after turning off the ignition switch 40, the compressor 13 is restarted favorably without being overloaded.

On the other hand, when the amount of electricity stored in the main secondary battery 25 decreases due to the traveling of the electric vehicle and the operation of the air conditioner 1, the charging circuit 28 is operated to perform charging. During this charging, the charging control circuit 31 detects charging and turns on the charging switch 39. Then, the MCU 33 releases the reset state and is activated in the same manner as described above, and executes the control program of FIG.

That is, the MCU 33 first performs step S.
When it is determined to be "NO" in 1 and it is determined whether the voltage input terminal 26a via the charge switch is switched from OFF to ON, the process proceeds to step S3, where "YES" is determined and the reference position setting operation of step S2 is performed. I do. As a result, both electronic expansion valves 19 and 20 are fully closed (t10 to t1 in FIG. 5).
1) The MCU 33 sets the cumulative pulse number to zero.
In this way, the MCU 33 functions as an opening degree control means and also turns on the charge switch 39 to charge the charging circuit 28.
Detects that charging has started, and functions as the main control means for causing the opening control function of itself to perform the reference position setting operation.

When the reference position setting operation is completed,
Although the voltage input terminal 26a via the charge switch is in the on state during charging, it does not mean that the voltage is switched from off to on. Therefore, the MCU 33 returns “NO” in step S3.
In the next step S4, "YES" is determined and step S8
Move to

In step S8, the pre-air conditioning is performed by operating the air conditioner 1 when the pre-air conditioning, that is, the pre-air conditioning of the passenger compartment of the electric vehicle is satisfied by the signals from the various sensors. Then, in the next step S9, when it is detected by the outdoor heat exchanger temperature sensor that the outdoor heat exchanger 17 is frosted, the air conditioner 1 is operated in the defrosting mode to perform the outdoor heat exchanger. Remove 17 frost. In addition,
When the operation in the pre-air conditioning and defrosting mode is performed in steps S8 and S9, it is premised that the air conditioning operation permission signal is input from the charge control circuit 31 to the MCU 33.

As described above, during charging, the reference position setting operation is performed at the start of the charging, and thereafter, steps S3, 4,
Repeat 8 and 9 to perform pre-air conditioning and defrosting as needed. Since the charging is usually performed in a state where no passenger is in the passenger compartment of the electric vehicle, the electronic expansion valve for cooling 34,
There is no problem even if an abnormal noise is generated during the reference position setting operation of the electronic heating expansion valve 35. Even if the vehicle is charged while the passenger is inside the vehicle, the charging circuit 2
8 is in operation and the air conditioner 1 is also operating in some cases, so the electronic expansion valve for cooling 34 and the electronic expansion valve for heating 35
Even if an abnormal noise is generated during the reference position setting operation, the abnormal noise is canceled by the operation noise of the charging circuit 28 and the air conditioner 1, so that no strangeness is felt.

When charging is completed, the charge switch 39
Is turned off. Therefore, the MCU 33 executes step S4.
Then, it is determined to be "NO" and the process proceeds to step S5. In this case, since the ignition switch 40 is off, the MCU 33 determines “NO” in step S5,
In step S7, the electronic expansion valve for cooling 19 and the electronic expansion valve for heating 20 are fully opened (T in FIG. 5) as described above.
After setting 11 to T12), the reset state is set.

As described above, the zero point adjustment is performed every time the main secondary battery 25 is charged, and the correspondence between the opening degree of the electronic expansion valves 19 and 20 and the cumulative pulse number is secured, so that the electronic expansion is performed. The opening degree control of the valves 19 and 20 can always be performed accurately.

The present invention is not limited to the embodiments described above and shown in the drawings, and the following expansions and modifications are possible. The refrigeration cycle 12 does not necessarily have to be configured as a heat pipe, and the condenser 9 or the evaporator 8 may be omitted and configured only for cooling or for heating.

The refrigerant circuit is not limited to the refrigerating cycle in which the refrigerant is compressed by the compressor, but may be constituted by, for example, an adsorption type refrigerating device in which the adsorbent adsorbs and desorbs the refrigerant. The charge switch 39 functions as a charge notifying unit that notifies the MCU 33 of the start of charging, but instead of this, the charge control circuit 31 may input a charge start signal to the MCU 33 via the input interface 34. The flow control valve is not limited to the expansion valve, and any valve provided for controlling the flow rate of the refrigerant in the refrigerant circuit may be used.

[0063]

According to the invention of claim 1, the zero point adjustment performed by operating the flow control valve to the reference position is performed when the secondary battery in which the charging device operates is being charged. Therefore, the reference position of the flow control valve is set. Even if an abnormal noise is generated at the time of setting, the abnormal noise of the flow control valve will not be annoyingly felt.

According to the second aspect of the present invention, the valve of the flow control valve is used from the time of purchasing a new vehicle and first operating the air conditioner, or the time of first operating the air conditioner after replacing the secondary battery. The opening can be controlled with high accuracy.

According to the invention described in claims 3 and 4,
It is possible to correct the position of the flow control valve at the fully opened position when the compressor of the refrigeration cycle is stopped and when the refrigerant flow path of the heat pump is switched.

[Brief description of drawings]

FIG. 1 is a flowchart showing an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of the entire air conditioner.

FIG. 3 is a block diagram showing the overall electrical configuration.

FIG. 4 is a schematic circuit configuration diagram of an air conditioning ECU.

FIG. 5 is a diagram showing an operation mode of an air conditioner and an opening / closing relationship of an electronic expansion valve.

[Explanation of symbols]

In the figure, 1 is an air conditioner, 6 is a blower, 8 is an evaporator,
Reference numeral 9 is a condenser, 12 is a refrigeration cycle (refrigerant circuit, heat pump), 13 is a compressor, 14 is an electromagnetic four-way switching valve, 17 is an outdoor heat exchanger, 19 is an electronic expansion valve for cooling (flow control valve), and 20 is for heating. Electronic expansion valve (flow control valve),
21 is an accumulator, 23 is a compressor motor, 2
4 is an inverter, 25 is a secondary battery, 26 is an EC for air conditioning
U and 27 are auxiliary secondary batteries, 33 is an MCU (opening degree control means, main control means), 39 is a charge switch, and 40 is an ignition switch.

Claims (4)

[Claims] 1. An air conditioner comprising a refrigerant circuit and a flow rate control valve for adjusting the refrigerant flow rate of the refrigerant circuit, the air conditioner being operated by receiving electric power from a secondary battery mounted in an electric vehicle. Which controls the opening of the flow control valve, the opening control means for controlling the opening of the flow control valve, and the opening when the charging detection means detects charging. A control device for an air conditioner for an electric vehicle, comprising: a main control unit that causes a control unit to perform a reference position setting operation for setting the flow control valve to a reference position. 2. An auxiliary secondary battery is provided as a power source for the main control means, and the main control means is connected to the auxiliary secondary battery and before the first operation of the air conditioner, the opening degree is increased. The control device for an air conditioner for an electric vehicle according to claim 1, wherein the control means is caused to perform the reference position setting operation. 3. The refrigerant circuit comprises a refrigeration cycle,
3. The main control means causes the opening degree control means to gradually increase the opening degree of the flow rate control valve to the fully opened position when the compressor of the refrigeration cycle is stopped. A control device for an air conditioner for an electric vehicle as described above. 4. The refrigerant circuit comprises a heat pump,
4. The main control means causes the opening degree control means to gradually increase the opening degree of the flow rate control valve to the fully open position when switching the refrigerant flow path of the heat pump. A control device for an air conditioner for an electric vehicle according to any one of 1.