JP2004189140A - Air-conditioner for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioner for a vehicle which is prevented from being deteriorated in air-conditioning performance in response to the interruption of the operation of air conditioner. <P>SOLUTION: The air conditioner is used for the vehicle equipped with a motor-driven power steering device that assists the steering operation of an occupant via a driving force from a motor. A time to temporarily stop the operation of the air conditioner from the start of the operation of power steering device (air conditioner cut-off time) is determined in response to a load on the power steering device (steering angle time variation dθ/dt). For the time of temporary stoppage (air conditioner cut-off time), the air-conditioner stops running. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a vehicle air conditioner.
[0002]
[Prior art]
When the vehicle air conditioner (hereinafter referred to as the air conditioner) and the power steering operate simultaneously, the engine intake air amount is corrected to prevent the engine speed from decreasing and engine stall, but the response of the intake air amount is delayed. It takes time for the engine speed to stabilize. Therefore, the operation of the air conditioner is temporarily stopped (hereinafter, referred to as air conditioner cut) in order to prevent the engine speed from lowering and further stall while giving priority to the power steering function.
[0003]
Specifically, when the power steering is operated within a predetermined time from when the occupant turns on the air conditioner switch to when the engine rotation speed is stabilized, for example, within one second, or when the engine rotation speed is reduced after the power steering is operated. When the occupant turns on the air conditioner switch within a predetermined time until stabilization, for example, within two seconds, the air conditioner is cut off for a predetermined time, for example, two seconds, and the air conditioner is operated after the elapse of the air conditioner cut time.
[0004]
Prior art documents related to the invention of this application include the following.
[Patent Document 1]
JP-A-2002-106395
[0005]
[Problems to be solved by the invention]
However, in the conventional vehicle air conditioner, when the air conditioner and the power steering operate simultaneously, the air conditioner is cut off for a predetermined time unconditionally, and there is a problem that the operation of the air conditioner is delayed and the air conditioning performance is reduced.
[0006]
The present invention provides an air conditioner for a vehicle that suppresses a decrease in air conditioning performance when a request for simultaneous operation of an electric power steering and an air conditioner is made.
[0007]
[Means for Solving the Problems]
(1) The present invention is an air conditioner used for a vehicle equipped with an electric power steering device that assists steering of an occupant by a driving force of a motor, wherein the electric power steering device operates according to a load of the electric power steering device. Is determined from the point in time when the operation of the air conditioner is temporarily stopped, and the operation of the air conditioner is stopped during the temporary stop time.
(2) The present invention is used in a vehicle equipped with an electric power steering device that assists the steering of an occupant by the driving force of a motor, and is an air conditioner equipped with a variable displacement compressor. Accordingly, the discharge capacity reduction amount and the discharge capacity reduction time for temporarily reducing the refrigerant discharge capacity of the compressor are determined from the time when the electric power steering device starts operating, and the discharge capacity reduction amount and the discharge capacity reduction time are determined. Therefore, the refrigerant discharge capacity of the compressor is controlled.
[0008]
【The invention's effect】
According to the present invention, it is possible to suppress a decrease in air conditioning performance when a request for simultaneous operation of the electric power steering and the air conditioner is made.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
<< First Embodiment of the Invention >>
FIG. 1 shows the configuration of the first embodiment. The air conditioner switch 1 is an operation member for operating or stopping the air conditioner. The idle switch 2 is a switch that detects a state where the rotation speed of the engine is equal to or lower than a predetermined idling speed. The refrigerant pressure sensor 3 detects the pressure Pd of the refrigerant discharged from a compressor (not shown), and the steering angle sensor 4 detects the steering angle θ of the steering. Further, the water temperature sensor 5 detects a cooling water temperature Tw of the engine, and the vehicle speed sensor 6 detects a traveling speed V of the vehicle.
[0010]
The controller 7 includes a CPU, peripheral components such as a memory and an A / D converter, and executes a control program described later to perform an air conditioner cutoff control and the like.
[0011]
The compressor control circuit 8 controls connection and release of the magnet clutch 9 of the compressor driven by the engine. When an ignition key (not shown) of the vehicle is set to the ON position, the ignition switch 10 is closed, and the compressor is ready for operation. In this state, when an ON signal of the air conditioner relay 11 is output from the controller 7, the air conditioner relay coil 13 is energized from the battery power supply BAT through the fuse 12 and the ignition switch 10, and the air conditioner relay contact 14 is closed. Then, power is supplied from the battery power supply BAT to the magnet clutch 9 of the compressor through the fuse 15 and the air conditioner relay contact 14, and the clutch 9 is connected to operate the compressor by the driving force of the engine.
[0012]
The throttle valve control device 16 drives a throttle motor 17 according to a control signal from the controller 7 to control the throttle valve opening of the engine. The electric power steering (hereinafter referred to as electric power steering) device 18 is a device that assists the occupant in steering by the driving force of a motor. When the device 18 is in the operating state, that is, in the assisting state of the occupant steering by the motor driving force, an operating signal is sent to the controller 7.
[0013]
FIG. 2 is a flowchart illustrating an air conditioner cut-off control program according to the first embodiment. When the air conditioner switch 1 is turned on (ON), the controller 7 repeatedly executes the air conditioner cut control program.
[0014]
In step 1, based on the steering angle θ detected by the steering angle sensor 4, the time variation dθ / dt is obtained. In the following step 2, the discharged refrigerant pressure Pd detected by the refrigerant pressure sensor 3 is detected. Then, in step 3, it is confirmed whether the air conditioner cut start condition is satisfied.
[0015]
An air conditioner cut start condition will be described with reference to FIGS. The first air conditioner cut start condition is (1) when the vehicle speed V detected by the vehicle speed sensor 6 is lower than a predetermined value Vo (for example, 30 km / h), or when the idling state of the engine is detected by the idle switch 2, and (2) When the water temperature Tw detected by the water temperature sensor 5 is higher than a predetermined value To (for example, 60 ° C.), and (3) As shown in FIG. 3, a predetermined time (for example, 1 [S]) after the air conditioner switch 1 is turned on. ]), The electric power steering is activated within the period, and if all of the conditions (1) to (3) are satisfied, the air conditioner cut is started.
[0016]
As shown in FIG. 3, when the air conditioner switch 1 is turned on at the time t1 in the states of the above (1) and (2), the controller 7 sets the air conditioner relay at the time t2 after a delay time of 0.5 [S]. 11 is turned on, the magnet clutch 9 is connected, and the operation of the compressor is started. That is, the air conditioning operation in the vehicle compartment is started. However, when an operation signal is input from the electric power steering device 18 at a time t3 within 1 [S] after the air conditioner switch 1 is turned on, the air conditioner relay 11 is immediately turned off to release the magnet clutch 9 and the air conditioning operation is started. Stop. That is, the air conditioner is cut.
[0017]
The air conditioner cut is ended at time t4 when an air conditioner cut time Tc (described in detail later) has elapsed since the start of the air conditioner cut. However, the controller 7 does not immediately turn on the air conditioner relay 11 and a delay time of 0.5 [S] later. At time t5, the air conditioner relay 11 is turned on, the magnet clutch 9 is connected, and the operation of the compressor is restarted.
[0018]
Next, the second air conditioner cut start condition is as follows: (1) When the vehicle speed V detected by the vehicle speed sensor 6 is lower than a predetermined value Vo (for example, 30 km / h), or when the idling state of the engine is detected by the idle switch 2. And (2) when the water temperature Tw detected by the water temperature sensor 5 is higher than a predetermined value To (for example, 60 ° C.), and (3) as shown in FIG. The air conditioner switch 1 is turned on within [S]), and the air conditioner cut off is started when all of the conditions (1) to (3) are satisfied.
[0019]
As shown in FIG. 4, in the above-mentioned states (1) and (2), the air conditioner switch 1 is turned on at time t12 within 2 [S] after the activation signal of the electric power steering device 18 is inputted at time t11. Even if it is done, the controller 7 does not immediately turn on the air conditioner relay 11 and cuts off the air conditioner so as not to perform the air conditioning operation in the vehicle compartment.
[0020]
The air conditioner cut is ended at time t14 when the air conditioner cut time Tc (described in detail later) has elapsed from the electric power steering operation time t11. At t15, the air conditioner relay 11 is turned on, the magnet clutch 9 is connected, and the operation of the compressor is started. That is, the air conditioning operation in the vehicle compartment is started.
[0021]
In Step 3 of FIG. 2, if the above-described first or second air conditioner cut start condition is satisfied, the process proceeds to Step 4, and the air conditioner cut time Tc is determined. If the air conditioner cut start condition is not satisfied, the process returns to step 1 and repeats the above-described processing.
[0022]
Here, a method of determining the air conditioner cut-off time Tc will be described. FIG. 5 shows changes in the steering angle θ [deg] of the electric power steering, the alternator (ALT) torque, the engine rotation speed, and the amount of engine intake air when the electric power steering is steered at a constant steering angle time variation dθ / dt. Is shown.
[0023]
When the electric power steering operates, power is started by the alternator (generator) to supply electric power to the motor of the electric power steering device 18, and the torque for driving the alternator increases suddenly. Since the alternator is driven by the engine, the alternator torque becomes a load on the engine, and the rotational speed of the engine decreases as the alternator torque increases. At this time, the throttle valve control device 16 drives the throttle motor 17 to adjust the throttle valve in the opening direction to increase the amount of air taken into the engine.
[0024]
If the air conditioner switch 1 is turned on while the electric power steering is operating and the engine rotation speed is decreasing, the engine rotation speed is further reduced and becomes unstable, which may hinder the running of the vehicle. Above, the ride is worse. Therefore, after the operation of the electric power steering, it is necessary to stop the operation of the air conditioner for a time Tc until the rotation of the engine is stabilized by compensating the decrease in the engine rotation speed due to the increase in the alternator torque. This time Tc is defined as an air conditioner cutoff time.
[0025]
FIG. 6 shows the air conditioner cut-off time Tc with respect to the time variation dθ / dt of the steering angle θ with the refrigerant discharge pressure Pd as a parameter. The load for driving the alternator of the engine, that is, the electric power steering load of the engine is proportional to the time variation dθ / dt of the steering angle θ of the electric power steering. Therefore, first, as the time variation dθ / dt of the steering angle θ is larger, the air-conditioner cut-off time Tc is made longer.
[0026]
On the other hand, the load for driving the compressor of the engine, that is, the load of the air conditioner of the engine is proportional to the pressure Pd of the refrigerant discharged from the compressor. The higher the pressure Pd of the discharged refrigerant, the greater the load of the air conditioner of the engine.
[0027]
Therefore, in the first embodiment, as shown in FIG. 6, when the discharge refrigerant pressure Pd is lower than the predetermined value Pd1, the air conditioner cut-off time Tc for the steering angle time change dθ / dt is determined according to the solid line, When the discharge refrigerant pressure Pd is equal to or more than the predetermined value Pd1, the air conditioner cut-off time Tc for the steering angle time change dθ / dt is determined according to the broken line.
[0028]
When the air-conditioner cut-off time Tc is determined, the air-conditioner relay 11 is turned off in step 5 of FIG. 2, the magnet clutch 9 is released, the compressor is stopped, and the air-conditioner cut is started. In step 6, it is confirmed whether or not the air-conditioner cut time Tc has elapsed. If the air-conditioner cut time Tc has elapsed, the process proceeds to step 7, and the air conditioner cut is terminated. That is, the air conditioner relay 11 is turned on, the magnet clutch 9 is connected, and the compressor is operated to perform air conditioning in the vehicle compartment.
[0029]
As described above, according to the first embodiment, the load on the electric power steering device is estimated, and the operation of the air conditioner is temporarily stopped from the time when the electric power steering device starts operating according to the load on the electric power steering device. The time to stop (air conditioner cut) is determined, and the operation of the air conditioner is stopped during the temporary stop time (air conditioner cut time) from the time when the electric power steering device starts operating. The required minimum pause time can be determined accordingly, and a decrease in the air-conditioning performance can be suppressed while compensating for a decrease in the rotation speed of the engine when a request for simultaneous operation of the electric power steering and the air conditioner is made.
[0030]
Also, the suspension time (air conditioner cut-off time) is made longer as the time change amount of the steering angle is larger and the refrigerant pressure discharged from the compressor is higher, so that it is determined according to the load of the electric power steering device and the load of the air conditioner. In addition, it is possible to determine the required minimum pause time, and to suppress a decrease in the air conditioning performance while compensating for a decrease in the rotation speed of the engine when simultaneous operation of the electric power steering and the air conditioner is requested.
[0031]
It should be noted that as the steering angle time change dθ / dt is larger, a larger electric power must be supplied to the motor of the electric power steering device 18, but depending on the steering angle time change dθ / dt, the power generation performance of the alternator may be exceeded. is there. In this case, the electric power steering motor is driven by the power generated by the alternator and the power discharged from the battery.
[0032]
However, the electric power steering load of the engine is only the power generation load by the alternator, and the discharged power from the battery during the operation of the electric power steering does not become the engine load. Therefore, when the electric power steering motor is driven by the electric power generated by the alternator and the electric power discharged from the battery, the electric power steering load on the engine is reduced by the amount of the electric power discharged from the battery. Tc can be shortened.
[0033]
The power supplied from the battery to the electric power steering motor is calculated by calculating the product of the discharge current of the battery during the operation of the electric power steering and the motor voltage, or by detecting the current of the electric power steering motor during the operation of the electric power steering. Many methods are conceivable, such as calculating the electric power supplied to the motor by the product of the motor voltage and subtracting the maximum power generated by the alternator from the electric power supplied to the motor.
[0034]
In the first embodiment, since the electric power steering load (alternator load) of the engine during the electric power steering operation is proportional to the time change dθ / dt of the steering angle θ, the steering angle time change dθ An example of estimating the electric power steering load of the engine based on / dt was shown. By the way, there is no fixed proportional relationship between the steering angle θ and the electric power steering load of the engine. However, at least when the steering angle θ is large, the electric power steering load of the engine is large. The load may be estimated.
[0035]
<< Second Embodiment of the Invention >>
In the first embodiment described above, the air conditioner cut-off time Tc is determined based on the steering angle time change amount dθ / dt and the discharge refrigerant pressure Pd, and when there is a request to operate the electric power steering and the air conditioner simultaneously. In this example, the operation of the electric power steering is prioritized, and the operation of the compressor is prohibited for the air-conditioner cut-off time Tc. In the second embodiment, taking a vehicle air conditioner using a variable capacity compressor as an example, when there is a simultaneous operation request of the electric power steering and the air conditioner, a destroke is performed without stopping the compressor, Compensate for reduced engine speed.
[0036]
FIG. 7 shows the configuration of the second embodiment. Note that the same reference numerals are given to the same devices as those shown in FIG. 1 and the description will focus on the differences. In the second embodiment, a variable displacement compressor is used, and a solenoid type control valve 20 is driven by a discharge displacement control device 19 to adjust a destroke amount (a decrease amount from a full stroke) of a compressor piston to discharge refrigerant. Control capacity. The controller 7 executes a control program to be described later to perform a destroke of the compressor.
[0037]
If the amount of destroke of the compressor piston is increased, the piston stroke is shortened and the discharge capacity of the refrigerant is reduced, so that the drive load of the compressor, that is, the load of the air conditioner of the engine is reduced. On the other hand, if the time for performing the destroke of the compressor piston is made longer, the driving load of the compressor, that is, the air conditioner load of the engine becomes smaller accordingly.
[0038]
In the second embodiment, as described above, the electric power steering load of the engine is estimated based on the time change amount dθ / dt of the steering angle θ, and the air conditioner is cut off when the simultaneous operation of the electric power steering and the air conditioner is requested. Instead, the destroke amount and the destroke time of the variable capacity compressor are determined according to the electric power steering load of the engine, and the compressor is destroked to reduce the load on the engine air conditioner and prevent the engine speed from decreasing.
[0039]
FIG. 8 is a flowchart illustrating a destroke control program according to the second embodiment. When the air conditioner switch 1 is turned on (ON), the controller 7 repeatedly executes the destroke control program.
[0040]
In step 11, the time change amount dθ / dt is obtained based on the steering angle θ detected by the steering angle sensor 4. In the following step 12, the discharged refrigerant pressure Pd detected by the refrigerant pressure sensor 3 is detected. Then, in step 13, it is confirmed whether the destroke start condition is satisfied.
[0041]
The destroke start condition will be described with reference to FIGS. The first destroke start condition is (1) when the vehicle speed V detected by the vehicle speed sensor 6 is less than a predetermined value Vo (for example, 30 km / h), or when the idling switch 2 detects the idling state of the engine, and (2) When the water temperature Tw detected by the water temperature sensor 5 is higher than a predetermined value To (for example, 60 ° C.), and (3) As shown in FIG. 9, a predetermined time (for example, 1 [S]) after the air conditioner switch 1 is turned on. ]), The electric power steering is activated within the period, and when all of the conditions (1) to (3) are satisfied, the destroke is started.
[0042]
As shown in FIG. 9, when the air conditioner switch 1 is turned on at time t1 in the states of the above (1) and (2), the controller 7 switches the air conditioner relay at time t2 after a delay time of 0.5 [S]. 11 is turned on, the magnet clutch 9 is connected, and the operation of the compressor is started. That is, the air conditioning operation in the vehicle compartment is started. However, when an operation signal is input from the electric power steering device 18 at time t3 within 1 [S] after the air conditioner switch 1 is turned on, the control valve 20 is driven by the discharge displacement control device 19 while the compressor continues to operate. Then, the compressor piston starts destroke.
[0043]
At time t4 when a destroke time Ts (details described later) has elapsed since the start of the compressor piston destroke, the destroke is terminated, and the compressor is continuously operated with a full stroke or a destroke amount corresponding to the air conditioning capacity in the vehicle compartment. continue.
[0044]
Next, the second destroke start condition is as follows: (1) When the vehicle speed V detected by the vehicle speed sensor 6 is lower than a predetermined value Vo (for example, 30 km / h), or when the idling switch 2 detects the idling state of the engine. And (2) when the water temperature Tw detected by the water temperature sensor 5 is higher than a predetermined value To (for example, 60 ° C.), and (3) as shown in FIG. The air conditioner switch 1 is turned on within [S]), and the destroke is started when all of the conditions (1) to (3) are satisfied.
[0045]
As shown in FIG. 10, in the states of the above (1) and (2), the air conditioner switch 1 is turned on at time t12 within 2 [S] after the activation signal of the electric power steering device 18 is inputted at time t11. Then, at time t13 after a delay time of 0.5 [S], the air conditioner relay 11 is turned on, the magnet clutch 9 is connected, and the operation of the compressor is started. However, at this time, the control valve 20 is driven by the discharge capacity control device 19, and the compressor piston destrokes.
[0046]
At a time t14 when a destroke time Ts (details described later) has elapsed from the electric power steering operation time t11, the destroke is ended, and the compressor continues to operate with a full stroke or a destroke amount corresponding to the air conditioning capacity in the vehicle compartment.
[0047]
In step 13 of FIG. 8, when the first or second destroke start condition described above is satisfied, the process proceeds to step 14, where the destroke amount Sd and the destroke time Ts are determined. If the destroke start condition is not satisfied, the process returns to step 11, and the above-described processing is repeated.
[0048]
Here, a method of determining the destroke amount Sd and the destroke time Ts will be described. FIG. 11A shows the destroke amount Sd with respect to the time change dθ / dt of the steering angle θ, and FIG. 11B shows the data with respect to the time change dθ / dt of the steering angle θ with the refrigerant discharge pressure Pd as a parameter. This shows the stroke time Ts. The load for driving the alternator of the engine, that is, the electric power steering load of the engine is proportional to the time variation dθ / dt of the steering angle θ of the electric power steering. Therefore, first, as the time variation dθ / dt of the steering angle θ increases, the destroke amount Sd increases, and the refrigerant discharge capacity decreases.
[0049]
On the other hand, the load for driving the compressor of the engine, that is, the load of the air conditioner of the engine is proportional to the pressure Pd of the refrigerant discharged from the compressor. The higher the pressure Pd of the discharged refrigerant, the greater the load of the air conditioner of the engine.
Therefore, in the second embodiment, as shown in FIG. 11B, when the discharge refrigerant pressure Pd is lower than the predetermined value Pd1, the destroke time Ts with respect to the steering angle time change dθ / dt is calculated according to the solid line. When the determined refrigerant pressure Pd is equal to or greater than the predetermined value Pd1, the destroke time Ts for the steering angle time change dθ / dt is determined according to the broken line.
[0050]
After the destroke time Ts is determined, the control valve 20 is driven by the discharge capacity control device 19 in step 15 in FIG. In step 16, it is confirmed whether or not the destroke time Ts has elapsed. If the destroke time Ts has elapsed, the process proceeds to step 17 and ends the destroke. After the end of the destroke, the compressor is operated at the full stroke as described above, or the compressor is continuously operated with a destroke amount corresponding to the air conditioning capacity of the vehicle interior.
[0051]
As described above, according to the second embodiment, the load on the electric power steering device is estimated, and the refrigerant discharge capacity of the compressor is temporarily changed from the time when the electric power steering device starts operating according to the load on the electric power steering device. The discharge capacity reduction amount (destroke amount) and the discharge capacity reduction time (destroke time) to be reduced are determined, and the compressor is operated in accordance with the discharge capacity reduction amount and the discharge capacity reduction time from the time when the electric power steering device starts operating. Control of the refrigerant discharge capacity, it is possible to determine the minimum necessary discharge capacity reduction amount and discharge capacity reduction time according to the load of the electric power steering device, and to request simultaneous operation of the electric power steering and the air conditioner. It is possible to suppress a decrease in air conditioning performance while compensating for a decrease in the rotation speed of the engine at the time.
[0052]
In addition, the larger the time change of the steering angle, the larger the discharge capacity reduction amount and the longer the discharge capacity reduction time, and the longer the discharge capacity reduction time as the compressor discharge refrigerant pressure is higher, so that the electric power steering is increased. The required minimum pause time can be determined according to the load on the device and the load on the air conditioner, and the air conditioning performance decreases while compensating for the decrease in the engine speed when the simultaneous operation of the electric power steering and the air conditioner is requested. Can be suppressed.
[0053]
When the steering angle time change dθ / dt exceeds the power generation performance of the alternator, and the electric power steering motor is driven by the power generated by the alternator and the discharge power from the battery, as described above, the electric power steering motor is driven from the battery. Since the power steering load of the engine is reduced by the amount of power supplied to the motor, the larger the power supplied from the battery to the electric power steering motor, the larger the destroke amount Sd (the smaller the discharge capacity reduction amount), and The destroke time Ts (discharge capacity reduction time) may be shortened.
[0054]
The correspondence between the components of the claims and the components of the embodiment is as follows. That is, the controller 7 controls the load estimating means, the temporary stop time determining means, the operation stopping means, the power detecting means and the discharge capacity reduction determining means, the refrigerant pressure sensor 3 controls the refrigerant pressure detecting means, and the steering angle sensor 4 controls the steering angle detecting means. The discharge capacity control device 19 and the control valve 20 constitute compressor control means. Note that each component is not limited to the above configuration as long as the characteristic functions of the present invention are not impaired.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a first embodiment.
FIG. 2 is a flowchart illustrating air conditioner cutoff control according to the first embodiment.
FIG. 3 is a diagram illustrating an air conditioner cut start condition.
FIG. 4 is a diagram illustrating another air conditioner cut start condition.
FIG. 5 shows changes in the steering angle θ [deg], alternator (ALT) torque, engine rotation speed, and engine intake air amount of the electric power steering when the electric power steering is steered at a constant steering angle time variation dθ / dt. FIG.
FIG. 6 is a diagram showing an air conditioner cut-off time Tc with respect to a time variation dθ / dt of the steering angle θ with the refrigerant discharge pressure Pd as a parameter.
FIG. 7 is a diagram illustrating a configuration of a second embodiment.
FIG. 8 is a flowchart illustrating a destroke control program according to a second embodiment.
FIG. 9 is a diagram illustrating a destroke start condition.
FIG. 10 is a diagram illustrating another destroke start condition.
FIG. 11A shows a destroke amount Sd with respect to a time change dθ / dt of the steering angle θ, and FIG. 11B shows a data with respect to a time change dθ / dt of the steering angle θ with the refrigerant discharge pressure Pd as a parameter. FIG. 4 is a diagram illustrating a stroke time Ts.
[Explanation of symbols]
1 air conditioner switch
2 Idle switch
3 Refrigerant pressure sensor
4 Steering angle sensor
5 Water temperature sensor
6 Vehicle speed sensor
7 Controller
8 Compressor control circuit
9 Magnet clutch
10 Ignition switch
11 Air conditioner relay
12 fuses
13 Air conditioner relay coil
14 Air conditioner relay contact
15 Fuse
16 Throttle valve controller
17 Throttle motor
18 Electric power steering device
19 Discharge capacity control device
20 Solenoid control valve

Claims (10)

An air conditioner used for a vehicle equipped with an electric power steering device that assists steering of an occupant by a driving force of a motor,
Load estimating means for estimating the load of the electric power steering device;
A suspension time determining unit that determines a time period for temporarily stopping the operation of the air conditioner from the time when the electric power steering device starts operating, according to a load of the electric power steering device;
An air conditioner for a vehicle, comprising: operation stop means for stopping the operation of the air conditioner during the suspension time from the time when the electric power steering device starts operating. The vehicle air conditioner according to claim 1,
A steering angle detecting means for detecting a steering angle of the steering,
The load estimating unit estimates a load of the electric power steering device based on a time change amount of a steering angle,
The air-conditioning system for a vehicle according to claim 1, wherein the pause time determining means increases the pause time as the time change amount of the steering angle increases. The vehicle air conditioner according to claim 1,
A steering angle detecting means for detecting a steering angle of the steering,
The load estimating means estimates a load of the electric power steering device based on a steering angle,
The air-conditioning system for a vehicle according to claim 1, wherein said suspension time determination means extends said suspension time as the steering angle increases. The vehicle air conditioner according to claim 2 or 3,
A refrigerant pressure detecting means for detecting a refrigerant pressure discharged from the compressor,
The vehicular air conditioner according to claim 1, wherein the temporary stop time determining means increases the temporary stop time as the pressure of the discharged refrigerant increases. The air conditioner for a vehicle according to any one of claims 2 to 4,
Power detection means for detecting the power supplied from the vehicle battery to the motor of the electric power steering device,
The air conditioner for a vehicle according to claim 1, wherein said suspension time determination means shortens said suspension time as electric power supplied from said vehicle battery to said motor increases. An air conditioner equipped with a variable displacement compressor, which is used in a vehicle equipped with an electric power steering device that assists the occupant steering by a driving force of a motor,
Load estimating means for estimating the load of the electric power steering device;
A discharge capacity for determining a discharge capacity reduction amount and a discharge capacity reduction time for temporarily reducing the refrigerant discharge capacity of the compressor from the time when the electric power steering apparatus starts operating according to the load of the electric power steering apparatus. Reduction determination means;
An air conditioner for a vehicle, comprising: compressor control means for controlling a refrigerant discharge capacity of the compressor according to the discharge capacity reduction amount and the discharge capacity reduction time from the time when the electric power steering device starts operating. . The vehicle air conditioner according to claim 6,
A steering angle detecting means for detecting a steering angle of the steering,
The load estimating unit estimates a load of the electric power steering device based on a time change amount of a steering angle,
The vehicle air conditioner according to claim 1, wherein the discharge capacity reduction determining unit increases the discharge capacity reduction amount and lengthens the discharge capacity reduction time as the time change amount of the steering angle increases. The vehicle air conditioner according to claim 6,
A steering angle detecting means for detecting a steering angle of the steering,
The load estimating means estimates a load of the electric power steering device based on a steering angle,
The air conditioner for a vehicle according to claim 1, wherein the discharge capacity reduction determining means increases the discharge capacity reduction amount and the discharge capacity reduction time as the steering angle increases. The vehicle air conditioner according to claim 7 or 8,
A refrigerant pressure detecting means for detecting a refrigerant pressure discharged from the compressor,
The air-conditioning apparatus for a vehicle according to claim 1, wherein the discharge capacity reduction determining means increases the discharge capacity reduction time as the discharge refrigerant pressure increases. The vehicle air conditioner according to any one of claims 7 to 9,
Power detection means for detecting the power supplied from the vehicle battery to the motor of the electric power steering device,
The air-conditioning system for a vehicle according to claim 1, wherein the discharge capacity reduction determining means decreases the discharge capacity reduction amount and shortens the discharge capacity reduction time as the power supplied from the vehicle-mounted battery to the motor increases.

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