JP3367329B2 - Air conditioning controller for electric vehicles - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air-conditioning control system for an electric vehicle that air-conditions the interior of the electric vehicle.

[0002]

2. Description of the Related Art As shown in FIG. 11, a conventional electric vehicle air-conditioning control system has an electric compressor 1, an electric expansion valve 4, a vehicle outside air heat exchanger 2, and a vehicle outside air heat exchanger. A blower device 3 for the exchanger, a blower device 6 for the air heat exchanger in the vehicle interior,
The air blower 6 for the vehicle interior air heat exchanger and the vehicle interior air outlet 8
A ventilation circuit 9 connecting the two, a vehicle interior air heat exchanger 10 arranged in the ventilation circuit 9, a four-way switching valve 7, the electric compressor 1, the vehicle exterior air heat exchanger 2, and the vehicle interior. A refrigerant pipe 5 connecting the air heat exchanger 10, the four-way switching valve 7 and the electric expansion valve 4, a suction pressure detecting means 12 for detecting a suction pressure of the electric compressor 1, and a suction of the electric compressor 1. An intake temperature detecting means 13 for detecting a temperature, and the intake pressure and the intake temperature are input, and the throttle opening of the electric expansion valve 4 is calculated based on the input values to drive the electric expansion valve 4. And the air-conditioning control means 11 to operate.

FIG. 12 is a flow chart for performing control for controlling the heating degree in the conventional electric vehicle air conditioning control device of FIG.

In FIG. 12, the suction pressure is input from the suction pressure detection means 12 (step 601), and the saturation temperature of the refrigerant is calculated based on the suction pressure (step 60).
2) The suction temperature is input from the suction temperature detection means 13 (step 603), the actual heating degree is calculated from the suction temperature and the saturation temperature (step 604), and the difference between the target heating degree and the actual heating degree is calculated. Is calculated (step 605), and if the target heating degree is a larger value, the electric expansion valve 4 is controlled to close the throttle opening based on the correction amount shown in FIG. 13 (step 606). If the target degree of heating is smaller, the electric expansion valve 4 is controlled to open the throttle opening based on the correction amount shown in FIG. 13 (step 60).
7) If there is no difference from the target heating degree, the electric expansion valve 4 is not controlled (step 608) so that the target heating degree is achieved.

This control is performed not only while the electric compressor 1 is in operation, but also when it is started.

[0006]

When air conditioning of an electric vehicle is performed, the state of the vehicle interior at the time of starting the cooling operation is considerably hot because of the insolation. In order to quickly cool the passenger compartment from that state, it is necessary to stabilize the refrigeration cycle as quickly as possible and bring out the maximum capacity. In addition, the state of the passenger compartment at the time of starting the heating operation is considerably cold because it has fallen to almost the same temperature as the outside air temperature. In order to quickly warm the passenger compartment from that state, it is necessary to stabilize the refrigeration cycle as quickly as possible and bring out the maximum capacity.

However, the state of the refrigeration cycle at startup is
The rotation speed of the electric compressor 1 is fluctuating, and the suction temperature and the suction pressure of the electric compressor 1 are also rapidly changing. In addition, oil or liquid refrigerant is also accumulated in the vehicle interior air heat exchanger 10 and the vehicle exterior air heat exchanger 2.

However, even if the control for controlling the heating degree is performed from the unstable cycle state at the time of start-up as in the above-mentioned conventional case, the state of the refrigerant changes every moment, and the control is performed at a completely different heating degree. Therefore, it is in a state where the ability is not maximized. Further, since the opening degree of the electric expansion valve 4 is determined in a completely unstable cycle state, the opening degree is far from the opening degree of the electric expansion valve 4 in a stable cycle state. Therefore, it takes a considerable amount of time to bring the machine to its maximum ability in a stable cycle state.
Further, even if the electric expansion valve 4 is controlled in a state where oil or liquid refrigerant is accumulated in the vehicle interior air heat exchanger 10 and the vehicle exterior air heat exchanger 2, the circulation amount is controlled. Therefore, it does not flow uniformly, and it takes time for the refrigeration cycle to stabilize. Further, in this state, the suction pressure of the electric compressor 1 is lowered, and the capacity is hardly obtained.

That is, it took a considerable time for the refrigeration cycle to stabilize, and it was a problem that the capacity could not be maximized.

The present invention solves the above-mentioned conventional problems, and maximizes the capacity from the start of the cooling operation and the heating operation to further improve the comfort in the vehicle compartment. The purpose is to provide a control device.

[0011]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention relates to an expansion valve starting control for setting a predetermined opening time of an electric expansion valve when starting an electric compressor. Means are provided. By the expansion valve activation control means, the refrigeration cycle is in an unstable state for a predetermined time from the time of activation, so control is not performed to control the heating degree and is performed at a predetermined opening degree, and after the predetermined time elapses, refrigeration is performed. Control is performed to control the heating degree when the cycle is stable.

[0012]

[0013]

The invention described in DETAILED DESCRIPTION OF THE INVENTION Claim 1, electric when starting the electric compressor, the opening of at <br/> scheduled period of the electric expansion valve as determined by the thermal load of the vehicle interior A start-up control means for the expansion valve having a predetermined opening determined by the number of revolutions of the compressor is provided. As a result, the refrigeration cycle is in an unstable state for a predetermined time from the time of startup, so control that controls the heating degree is not performed, and the opening degree of the electrical expansion valve determined by the rotation speed of the electric compressor is not performed. Control with the car
After a lapse of a predetermined time determined by the heat load in the room, the refrigeration cycle is controlled in a stable state to control the heating degree.

According to a second aspect of the present invention, when the electric compressor is started, the opening degree of the electric expansion valve is set to the predetermined opening degree determined by the outside air temperature for a predetermined time determined by the heat load in the vehicle compartment. The expansion valve activation control means is provided. As a result, the refrigeration cycle is in an unstable state for a predetermined period of time from startup, so control is not performed to control the heating degree, but control is performed at the opening degree of the electric expansion valve determined by the outside air temperature. The control for controlling the heating degree is performed after the refrigeration cycle is stable after a lapse of a predetermined time determined by the heat load in the passenger compartment .

[0015]

[0016]

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of an air conditioning control device for an electric vehicle according to the present invention. In FIG. 1, an electric compressor 1
Electric expansion valve 4, vehicle exterior air heat exchanger 2, vehicle exterior air heat exchanger blower 3, vehicle interior air heat exchanger blower 6, vehicle interior air heat exchanger blower 6 and vehicle A ventilation circuit 9 connecting the indoor outlets 8, a vehicle interior air heat exchanger 10 arranged in the ventilation circuit 9, a four-way switching valve 7,
A refrigerant pipe 5 connecting the electric compressor 1, the vehicle exterior air heat exchanger 2, the vehicle interior air heat exchanger 10, the four-way switching valve 7 and the electric expansion valve 4, and the suction of the electric compressor 1. Suction pressure detection means 12 for detecting pressure, suction temperature detection means 13 for detecting the suction temperature of the electric compressor 1, and rotation speed detection means 14 for detecting the rotation speed of the electric compressor 1.
And an outside air temperature detecting means 15 for detecting an outside air temperature, a solar radiation detecting means 16 for detecting an amount of solar radiation, a vehicle interior temperature detecting means 17 for detecting a vehicle interior temperature, the intake pressure and the intake temperature, and Based on the input value, the air-conditioning control unit 11 that calculates the throttle opening degree of the electric expansion valve 4 to drive the electric expansion valve 4, and the outside air temperature and the inside of the air-conditioning control unit 11 The heat load calculation means 18 inputs the amount of solar radiation and the vehicle interior temperature and calculates the heat load based on the input values.

FIG. 2 is a control flowchart of an embodiment of claim 1 in the electric vehicle air conditioning control device of FIG.

In FIG. 2, it is judged whether or not the electric compressor 1 is in the activated state (step 101), and if it is not in the activated state, heating degree control is performed (step 104). If it is in the activated state, it is determined whether or not a predetermined time has elapsed from the time of activation (step 102), and if the predetermined time has elapsed, heating degree control is performed (step 104). If the predetermined time has not elapsed, the electric expansion valve 4
Is controlled at a predetermined opening (step 103), and it is again determined whether a predetermined time has elapsed (step 10).
2). Here, the heating degree control (step 104) is performed as shown in FIG.
Since it is the same as the control shown in (step 601 to step 608), the description thereof will be omitted.

Therefore, the control for controlling the heating degree is not performed for a predetermined time during which the refrigeration cycle is unstable, and the opening degree of the electric expansion valve 4 is set to the predetermined opening degree, so that the time for stabilizing the refrigeration cycle is shortened. In addition to being able to do so, it is possible to maximize the ability and make the interior of the vehicle comfortable more quickly.

FIG. 3 is a control flow chart of an embodiment of claim 2 in the electric vehicle air conditioning control device of FIG.

In FIG. 3, it is judged whether or not the electric compressor 1 has been started (step 201) and whether or not a predetermined time has elapsed since the start (step 202).
The heating degree control (step 206) is the same as the control shown in FIG. 2 (step 101, step 102, step 10).
Since it is similar to 4), the description is omitted and only different parts will be described. If the predetermined time has not elapsed in (step 202), the rotation speed of the electric compressor 1 is input (step 203) and corresponds to the rotation speed input from the rotation speed detection means 14 as shown in FIG. The predetermined opening degree of the electric expansion valve 4 is calculated (step 204), the electric expansion valve 4 is controlled at the predetermined opening degree determined in (step 204) (step 205), and the predetermined time is again set. It is determined whether the time has passed (step 202).

Therefore, the control for controlling the heating degree is not performed during a predetermined time during which the refrigeration cycle is unstable, and the heating degree during the cooling operation mainly fluctuates depending on the rotation speed of the electric compressor 1, so that the electric The opening degree of the expansion valve 4 is set to a predetermined opening degree corresponding to the rotation speed of the electric compressor 1. As a result, the time it takes for the refrigeration cycle to stabilize can be shortened, and the capacity can be maximized to make the passenger compartment more comfortable. This control is particularly effective during cooling operation.

FIG. 5 is a control flowchart of an embodiment of claim 3 in the electric vehicle air-conditioning controller of FIG.

In FIG. 5, it is judged whether or not the electric compressor 1 has been started (step 301) and whether or not a predetermined time has elapsed since the start (step 302).
The heating degree control (step 306) is the same as the control shown in FIG. 2 (step 101, step 102, step 10).
Since it is similar to 4), the description is omitted and only different parts will be described. If the predetermined time has not elapsed in the (step 302), the outside air temperature is input from the outside air temperature detecting means 15 (step 303), and the electric expansion corresponding to the input outside air temperature as shown in FIG. A predetermined opening of the valve 4 is calculated (step 304), the electric expansion valve 4 is controlled at the predetermined opening determined in (step 304) (step 305), and it is determined whether a predetermined time has passed again. A judgment is made (step 302).

Therefore, the control for controlling the heating degree is not performed during the predetermined time during which the refrigeration cycle is unstable, and the heating degree during the heating operation mainly fluctuates depending on the outside air temperature, so that the electric expansion valve 4 is opened. The degree is a predetermined opening corresponding to the outside air temperature. As a result, the time it takes for the refrigeration cycle to stabilize can be shortened, the maximum capacity can be maximized, and the passenger compartment can be made comfortable faster.
Note that this control is particularly effective during heating operation.

FIG. 7 is a control flow chart of an embodiment of claim 4 in the electric vehicle air conditioning control device of FIG.

In FIG. 7, it is judged whether or not the electric compressor 1 has been started (step 401) and whether or not a predetermined time has elapsed since the start (step 405).
The control for performing the electric expansion valve 4 at a predetermined opening (step 406) and the heating degree control (step 407) are as shown in FIG.
Since the control is the same as the control shown in (step 101, step 102, step 103, step 104), the description will be omitted and different parts will be described. (Step 40
If it is in the activated state in 1), the outside air temperature is input from the outside air temperature detecting means 15, the solar radiation amount is input from the solar radiation detecting means 16, and the vehicle interior temperature is input from the vehicle interior temperature detecting means 15 (step 402). The heat load is calculated from the outside air temperature, the amount of solar radiation, and the vehicle interior temperature (step 403), and a predetermined time corresponding to the heat load is calculated as shown in FIG. 8 (step 404), and the predetermined value determined in the above (step 404). It is determined whether time has passed (step 405).

Therefore, the time during which the cycle is unstable fluctuates depending on the heat load, so the predetermined time is calculated by the heat load,
During that time, the control for controlling the heating degree is not performed and the opening is set to a predetermined value. This makes it possible to quickly determine whether the refrigeration cycle is stable, maximize the capacity, and make the passenger compartment comfortable faster.

FIG. 9 is a control flow chart of an embodiment of claim 5 in the electric vehicle air conditioning control device of FIG.

In FIG. 9, it is judged whether the electric compressor 1 is in the activated state (step 501) and the heating degree control (step 507) is the same as the control shown in FIG. 2 (step 101, step 104). Since it is the same, the description will be omitted and only different parts will be described. The above (step 501)
If it is in the start-up state, the outside air temperature is input from the outside air temperature detecting means 15 (step 502), and as shown in FIG. 6, a predetermined opening degree (P) of the electric expansion valve 4 corresponding to the input outside air temperature. ) Is calculated (step 503), and the opening degree of the electric expansion valve 4 is controlled by fully opening (step 5).
04), it is determined whether the first predetermined time (T1) has elapsed (step 505), and the first predetermined time (T1)
If 1) has not elapsed, the control of (step 504) is continued, and if the first predetermined time (T1) has elapsed, the opening degree of the electric expansion valve 4 is reduced to 1 / the predetermined opening degree.
The control is performed at 2 (1 / 2P) (step 506), and the second
(Step 507), and if the second predetermined time (T2) has not elapsed, the control of the (step 506) is continued and the second predetermined time (T2) has passed. If the time (T2) has elapsed, the opening degree of the electric expansion valve 4 is set to 1/3 (1 / 3P) of the predetermined opening degree.
Control (step 508) for a third predetermined time (T
It is judged whether 3) has passed (step 509),
If the third predetermined time (T3) has not elapsed, the control in (step 508) is continued, and if the third predetermined time (T3) has elapsed, the electric expansion valve 4
Is set to a predetermined opening (P) (step 510), and heating degree control (step 511) is performed from that state.

Therefore, since the opening degree of the electric expansion valve 4 is gradually reduced in accordance with a predetermined time from full opening, the oil accumulated in the vehicle interior air heat exchanger 10 and the vehicle exterior air heat exchanger 2 is collected. Alternatively, the liquid refrigerant can be quickly and evenly flowed. Further, the suction pressure of the electric compressor 1 does not drop sharply. As a result, the refrigeration cycle can be stabilized more quickly, and the capacity can be maximized to make the passenger compartment comfortable faster. It should be noted that the air heat exchanger 10 in the vehicle compartment is started when heating is started.
Since oil or liquid refrigerant easily accumulates in the vehicle exterior air heat exchanger 2, this control is particularly effective during heating operation.

Although the predetermined opening degree (P) of the electric expansion valve 4 is a value calculated by the input outside air temperature, it is calculated by the rotation speed input by the rotation speed detecting means 14. The same effect can be obtained as the value.

The predetermined time is set to the first, second, and third predetermined times, and the predetermined opening is set to three stages such as 1/2 and 1/3, but there are two stages or four or more stages. Also, the same effect can be obtained.

[0036]

[0037]

As is apparent from the above-mentioned embodiment, claim 1
In the invention described in, the heat load is applied when the refrigeration cycle is unstable.
Because it fluctuates due to
During that time, control for controlling the heating degree is not performed, and the heating degree during the cooling operation mainly fluctuates depending on the rotation speed of the electric compressor, so the opening degree of the electric expansion valve is set to the rotation speed of the electric compressor. The corresponding opening is set. This makes it possible to reduce the time required for the refrigeration cycle to stabilize, and
It is possible to quickly judge whether the freeze cycle is stable.
As soon as they come, they can maximize their abilities and make the inside of the vehicle more comfortable. This control is particularly effective during cooling operation.

According to the invention described in claim 2 , the refrigeration cycle is
The unstable time varies depending on the heat load, so
The control unit controls the heating degree during that time, and the heating degree during the heating operation mainly fluctuates depending on the outside air temperature.Therefore, the opening degree of the electric expansion valve is set to a predetermined value corresponding to the outside air temperature. The opening is set. As a result, the time for the refrigeration cycle to stabilize can be shortened, and the refrigeration cycle
Together with being able to quickly judge whether or not
In addition, it is possible to maximize the ability and make the interior of the vehicle comfortable more quickly. Note that this control is particularly effective during heating operation.

[0039]

[0040]

[Brief description of drawings]

FIG. 1 is a configuration diagram of an air conditioning control device for an electric vehicle according to an embodiment of the present invention.

FIG. 2 is a control flowchart of an air conditioning control device for an electric vehicle according to an embodiment of the present invention.

FIG. 3 is a control flowchart of an air-conditioning control device for an electric vehicle according to an embodiment of the present invention.

FIG. 4 is a relationship diagram showing the relationship between the expansion valve opening and the rotational speed in FIG.

FIG. 5 is a control flowchart of an air conditioning control device for an electric vehicle according to an embodiment of the present invention.

6 is a relationship diagram showing the relationship between the expansion valve opening and the outside air temperature in FIG.

FIG. 7 is a control flowchart of an air-conditioning control device for an electric vehicle in one embodiment of the present invention.

8 is a relationship diagram showing the relationship between the expansion valve opening and the heat load in FIG.

FIG. 9 is a control flowchart of an air-conditioning control device for an electric vehicle according to an embodiment of the present invention.

FIG. 10 is a graph showing the relationship between expansion valve opening and control time in FIG.

FIG. 11 is a configuration diagram of a conventional air conditioning control device for an electric vehicle.

FIG. 12 is a control flowchart of a conventional air conditioning control device for an electric vehicle.

FIG. 13 is a relational diagram showing control of an expansion valve opening degree in FIG.

[Explanation of symbols]

1 Electric compressor 2 Exterior air heat exchanger 3 Air blower for outside air heat exchanger 4 Electric expansion valve 5 Refrigerant piping 6 Blower for air heat exchanger in passenger compartment 7 four-way switching valve 8 car interior air outlet 9 ventilation circuit 10 Car interior air heat exchanger 11 Air conditioning control means 12 Suction pressure detection means 13 Inhalation temperature detection means 14 Rotation speed detection means 15 Outside temperature detecting means 16 Solar radiation detection means 17 Vehicle interior temperature detection means 18 Heat load calculation means

Continuation of the front page (56) Reference JP-A-57-33756 (JP, A) JP-A-62-80469 (JP, A) JP-A-6-201199 (JP, A) JP-A-5-196309 (JP , A) JP 611971 (JP, A) JP 6-185814 (JP, A) JP 7-266858 (JP, A) Actual development 61-93766 (JP, U) Actual flat 3-5613 (JP, U) Actually developed 62-187914 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B60H 1/32 624 B60H 1/22 F25B 1/00 304 F25B 1/00 341 B60H 1/00

Claims (2)

(57) [Claims] 1. An electric expansion valve, an air conditioning control means for controlling at least the electric expansion valve, and a rotation speed of an electric compressor.
Detection means, and at least outside air temperature, vehicle interior temperature, and solar radiation
A heat load calculating means for calculating a heat load by means of, and a start-up control means for the expansion valve that sets the opening degree of the electric expansion valve to a predetermined opening degree for a predetermined time at startup ,
The stage detects the predetermined opening degree by the rotation speed detection means.
Determined according to the number of revolutions,
An air-conditioning control device for an electric vehicle, characterized by being determined by a value calculated by a calculating means . 2. An electric expansion valve, an air conditioning control means for controlling at least the electric expansion valve, and an outside air temperature detecting means.
And at least the outside air temperature, vehicle interior temperature, and solar radiation
A heat load calculation means for calculating a load and a start control means for the expansion valve that sets the opening degree of the electric expansion valve to a predetermined opening degree for a predetermined time at startup are provided, and the start control means is
Determined according to the outside air temperature detected by the outside air temperature detection means.
And the predetermined time is calculated by the heat load calculation means.
An air-conditioning control device for an electric vehicle, which is characterized in that the determined value is determined .