JP3106168B2 - Vehicle air conditioning controller - 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 a vehicle which controls the opening of a mix door so that the actual outlet temperature from each outlet into a vehicle compartment becomes a target outlet temperature.

[0002]

2. Description of the Related Art Conventionally, such an air conditioning control device for a vehicle includes, for example, an outlet temperature sensor provided at each outlet and an actual outlet temperature calculated based on an output from at least one outlet temperature sensor. An automatic air-conditioning control device including an arithmetic control device that controls the opening degree of the mix door via a mix door drive device so that the target blowout temperature is calculated based on a set temperature or the like. A mixed door opening correction operation for fixing or decreasing the opening of the mixed door for a predetermined time based on a switching command signal output from a blowing mode for closing the ventilator duct to another blowing mode for opening the ventilator duct. With the configuration provided with the circuit, when switching from the HEAT mode to the B / L mode, the opening of the mix door is set to the opening immediately before the mode switching. It is known that a fixed time is fixed or reduced, thereby preventing the hot air having a temperature considerably higher than the target outlet temperature from blowing from the vent outlet due to the slow response of the outlet temperature sensor at the time of the mode switching. (JP-A-62-199518).

[0003]

However, in the above-mentioned prior art, when the blow mode is switched, the opening degree of the mix door is fixed or reduced for a predetermined time to the opening degree immediately before the blow mode is switched. During the time, there was a problem that the opening of the mix door could not be controlled so as to obtain an appropriate blowing temperature.

The present invention has been made in view of such a conventional problem, and the difference between the actual blow-out temperature and the target blow-out temperature such as at the time of switching the blow-out mode or at the time of failure of a sensor or the like. It is an object of the present invention to provide a vehicle air-conditioning control device that can control the opening of a mix door so that an appropriate blowing temperature can be obtained even when the temperature of the air conditioner increases.

[0005]

In order to achieve the above object, the present invention provides an outlet temperature sensor provided at each outlet,
The opening degree control is performed on the mix door driving means so that the actual outlet temperature calculated based on the output from each of the outlet temperature sensors according to the outlet mode becomes the target outlet temperature calculated based on the vehicle interior temperature, the set temperature, and the like. An electronic control unit for outputting a signal and controlling the opening of the mix door through the driving means, wherein the electronic control unit is configured to control the temperature of the actual outlet temperature and the target outlet temperature. A temperature deviation calculating means for calculating a deviation, and a first mix for outputting an opening control signal for controlling an opening of the mix door based on the temperature deviation so that the actual outlet temperature becomes the target outlet temperature. Door control means, target mixed door opening calculating means for calculating a target mixed door opening based on the target outlet temperature, and a mixed door so that the opening becomes the target mixed door opening. A second mixed door control means for outputting an opening control signal for controlling, and selecting the opening control signal from the first mixed door control means when the temperature deviation is equal to or less than a predetermined value, When the deviation is equal to or greater than a predetermined value or in conjunction with the switching of the blowing mode, the second
Select the opening control signal from the mixed door control means,
And control selection means for outputting each opening control signal to the mix door driving means.

[0006]

When the temperature difference between the actual blowout temperature and the target blowout temperature is equal to or less than a predetermined value, the opening control signal from the first mix door control means is selected by the control selection means and output to the mix door drive means. The opening degree of the mix door is controlled so that the actual blowout temperature becomes the target blowout temperature, and when the temperature deviation between the actual blowout temperature and the target blowout temperature is equal to or greater than a predetermined value or in conjunction with the switching of the blowout mode, the second The opening control signal from the mixing door control means is selected by the control selecting means and output to the mixing door driving means, whereby the opening of the mixing door is controlled to the target mixing door opening.

[0007]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a schematic configuration diagram showing a vehicle air-conditioning control device according to one embodiment of the present invention. As shown in FIG. 1, a vehicle air conditioner using a vehicle air conditioner includes a blower unit 3 having an outside air inlet 1 and an inside air inlet 2 and a blower 4 disposed in a duct. A cooling unit 6 connected to the downstream end of the unit 3 and having the evaporator 5 disposed in the duct; and a heater unit 8 connected to the downstream end of the cooling unit 6 and having the heater core 7 disposed in the duct. And An evaporator temperature sensor 26 for detecting the outlet air temperature (evaporator temperature Te) of the evaporator 5 is provided downstream of the evaporator 5, and an output signal of the sensor 26 is input to a multiplexer 23 described later.

The blower unit 3 is provided with an intake door 9 for opening and closing the outside air inlet 1 and the inside air inlet 2. In the duct of the heater unit 8, a heater core 7 is provided.
Door 11 that opens and closes the front of the vehicle and the bypass 10
Is provided. The opening degree θ of the mixed door 11 is 0 to 100% by the mixed door actuator 12 (full cool position indicated by a solid line to full hot position indicated by a chain line).
Adjusted between. Is detected by a mixed door opening sensor 27 such as a potentiometer, and a signal representing the detected opening θ is input to the multiplexer 23.

On the downstream side of the duct of the heater unit 8,
A differential air outlet 13 which is an air outlet to a front window (not shown), a vent air outlet 14 which is an air outlet to the face, and a foot air outlet 15 which is an air outlet to a foot are provided. The opening and closing of each of the outlets 13 to 15 is a differential door 1
6, performed by the vent door 17 and the foot door 18. On the downstream side of each of the doors 16 to 18, a differential blowout temperature sensor 1 for detecting the temperature of the blowout air (differential blowout temperature Td, vent blowout temperature Tv, foot blowout temperature Tf), respectively.
9, a vent outlet temperature sensor 20 and a foot outlet temperature sensor 21 are provided, and an output signal of each outlet temperature sensor is input to a multiplexer 23.

As shown in FIG. 2, the vehicle air conditioning control device for controlling the vehicle air conditioner includes the blow-out temperature sensor 1
Actual outlet temperature T which is calculated based on the output from the at least one sensor 9,20,21 is, so that the target air temperature T ₀ which is calculated based on the set temperature Tset and the like, opens into the mix door driving circuit 25 The drive circuit 25 and the mixed door actuator 1
A microcomputer (electronic control unit) 22 that controls the opening of the mix door 11 via the control unit 2 is provided. The mixed door driving circuit 25 drives the mixed door actuator 12 according to the opening control signal, and constitutes a mixed door driving means together with the actuator 12.

The microcomputer 22 is a known microcomputer having a central processing unit (CPU), a read only memory (ROM), a random access memory (RAM), an input / output port I / O, and the like. The microcomputer 22 includes a multiplexer 23 for selecting and outputting a desired signal from various input signals and the multiplexer 2.
Various signals are input via an A / D converter 24 that converts an analog signal output from the digital signal 3 into a digital signal.

That is, the multiplexer 23 includes a differential blow temperature Td from the differential blow temperature sensor 19, a vent blow temperature Tv from the vent blow temperature sensor 20, a foot blow temperature Tf from the foot blow temperature sensor 21, and an evaporator temperature sensor 26. Temperature, the mixed door opening (actual mixed door opening) θ from the mixed door opening sensor 27, the vehicle interior temperature Tr from the vehicle interior temperature sensor 28, the outside air temperature Ta from the outside air temperature sensor 29, and solar radiation. Signals representing the amount of solar radiation Qs from the amount sensor 30 and the set temperature Tset from the temperature setter 31, respectively, are input.

As shown in FIG. 1, the microcomputer 22 includes an actual outlet temperature calculating means 22A for calculating an actual outlet temperature T based on the output from each of the outlet temperature sensors 19, 20, 21 according to the outlet mode. , The vehicle interior temperature Tr,
Outside air temperature Ta, on the basis of the amount of solar radiation Qs, and the set temperature Tset, and the target air temperature calculating means 22B for calculating a target air temperature T _0, based on each calculated result of the actual air temperature calculating means 22A and the target air temperature calculating means 22B , The temperature difference Tdiff (Tdiff = T ₀ −) between the target outlet temperature T ₀ and the actual outlet temperature T.
A temperature deviation calculating means 22C for calculating the T), based on the evaporator temperature Te and the target outlet air temperature T _0, the optimal target mix door opening degree θx determined by Te and T ₀ as shown in the map of FIG. 6 is a table Memory (R
OM) by searching the table stored in
And an opening control signal for controlling the opening of the mix door 11 based on the temperature deviation Tdiff so that the actual outlet temperature T becomes the target outlet temperature T _0. The first mixed door control means 22E for outputting the output signal, and the second mixed door for outputting an opening control signal for controlling the mixed door 11 so that the opening θ of the mixed door 11 becomes the target mixed door opening θx. The controller 22F selects the opening control signal from the first mix door controller 22E when the temperature deviation Tdiff is equal to or less than a first predetermined value A (for example, A = 2 ° (deg.)).
When the temperature deviation Tdiff is equal to or greater than a second predetermined value B (for example, B = 3 ° (deg.)) Larger than the first predetermined value A, the opening control signal from the second mixed door control means 22F is selected. ,
And control selection means 22G for outputting each opening control signal to the mixed door drive circuit 25.

The target outlet temperature calculating means 22B calculates the target outlet temperature T ₀ by the following equation (1).

T ₀ = −KA · Tr−KB · Ta−KC · Qs + KD · Tset + KE (1) where KA to KD are constants and KE is a correction term.

When the blow mode is the vent mode (VENT mode), the actual blow temperature calculating means 22A calculates the vent blow temperature Tv from the vent blow temperature sensor 20.
In the foot mode (FOOT mode), the foot outlet temperature Tf from the foot outlet temperature sensor 21 is used. In the differential mode (DEF mode), the differential outlet temperature sensor 19 is used.
The differential blowout temperature Td from is set as the actual blowout temperature T. When the blowing mode is the bi-level mode (B / L mode), the calculating means calculates the differential foot mode (D / F mode) according to the following equation (2).
In this case, the actual outlet temperature T is calculated by the following equation (3).

[0018]

(Equation 1) Here, a and b are constants.

[0019]

(Equation 2) The memory (RAM) of the microcomputer 22
Has stored therein control programs shown in FIGS. 3 to 5 in advance, and the central processing unit (CPU) executes processing according to the control programs.

Next, the operation of the vehicle air-conditioning control apparatus according to the embodiment having the above-described configuration will be described with reference to FIGS.

FIG. 3 is a flowchart showing a control procedure of automatic air conditioning control by the vehicle air conditioning controller.

In FIG. 1, first, all data are initialized in step S1, and then, in step S2, each of the sensors 19 to 19 is initialized.
It reads output signals from the control switches 21 and 26 to 30, various input data indicating the ON / OFF state of an operation switch (A / CSW) of a control panel (not shown), and the positions of the doors 16 to 18.

In the next step S3, the target outlet temperature T ₀ is calculated by the above equation (1) based on the vehicle interior temperature Tr, the outside air temperature Ta, the insolation Qs and the set temperature Tset read in step S2.

[0024] In the next step S4, performs mixing door controlled by the subroutine of mix door control shown in FIGS. 4 and 5 using the target air temperature T ₀ determined in step S3.

[0025] In the next step S5, the control of the air flow rate of the blower 4 by calculating the control voltage of the blower 4 on the basis of the target outlet air temperature T _0. In the next step S6, based on the target air temperature T _0, performs outlet mode control by controlling switching the position of each door 16-18. In the next step S7, based on the target air temperature T _0, performs intake door control for switching the position of the intake door 9.

In the next step S8, a compressor ON / OFF control (not shown) according to the ON / OFF state of the operation switch read in step S2, and a target outlet temperature T
Performs compressor capacity control based on ₀ . In step S9, the vehicle interior temperature Tr and the like obtained by the operations in steps S2 to S8 are displayed on a display unit (not shown), and the process returns to step S2. Thereafter, the operations in steps S2 to S8 are repeated, and the controls in steps S4 to S8 are executed so that the vehicle interior temperature Tr becomes the set temperature Tset.

The mix door control in step S4 is executed according to a mix door control subroutine shown in FIGS.

First, the blow mode is the vent mode (VEN).
(T mode) or not (step S11), and if the answer to this step S11 is YES, the process proceeds to step S12, where the vent outlet temperature Tv is set as the actual outlet temperature (T = T
v), and further proceed to step S20. If the answer to step S11 is NO, the process proceeds to step S13, where it is determined whether or not the blowing mode is the bilevel mode (B / L mode) (a blowing mode in which both vent and foot outlets are opened). If YES, the actual outlet temperature T is calculated by the above equation (2) (step S14), and the process proceeds to step S20.

If the answer to step S13 is NO, the process proceeds to step S15, and the blowing mode is set to the foot mode (FOO).
(T mode) is determined, and if the answer is YES, the process proceeds to step S16, where the foot outlet temperature Tf is set to the actual outlet temperature T (T = Tf), and further proceeds to step S20. If the answer to step S15 is NO, the process proceeds to step S17, and the blowing mode is set to the differential foot mode (D / F mode).
It is determined whether or not the mode is a blowing mode in which both the differential and the foot blowing ports are opened.

If the answer to step S17 is YES, the actual outlet temperature T is calculated by the above equation (3) (step S1).
8), and further proceed to step S20.

On the other hand, if the answer to step S17 is NO, the process proceeds to step S19, where the blowing mode is the differential mode (DEF mode), so that the differential blowing temperature Td is set to the actual blowing temperature (T = Td), and further, step S20 Proceed to.

In step S20, the temperature difference Tdiff () between the actual outlet temperature T determined in steps S12, S14, S16, S18 and S19 and the target outlet temperature T ₀ determined in step S3 in FIG. Tdiff =
T ₀ -T).

Next, the process proceeds to step S21,
Whether the absolute value | Tdiff | of the temperature deviation Tdiff obtained in step 20 is equal to or smaller than the first predetermined value A (A = 2 °) or equal to or larger than the second predetermined value B (B = 3 °) Is determined.
When the answer is A, that is, when | Tdiff | is equal to or less than the first predetermined value A, the process proceeds to step S22. When the answer is B,
That is, when the value is equal to or more than the second predetermined value B, the process proceeds to step S29.

In step S22, the absolute value | Tdiff | of the temperature deviation is smaller than 1 ° (deg.) (| Tdiff | <
1 °), and if the answer is YES, the actual outlet temperature T is substantially equal to the target outlet temperature T ₀ ,
Proceeding to step S23, the drive of the mix door 11 is stopped, and this program ends. On the other hand, if the answer to step S22 is NO, that is, if | Tdiff |
Proceeding to step S24, the actual outlet temperature T becomes the target outlet temperature T
_It is determined whether it is higher than ₀ (T ₀ <T).

If the answer to step S24 is YES (T ₀
<T), the process proceeds to step S25, and the process proceeds to step S2.
It is determined whether 0.2 seconds (predetermined time) has elapsed with T ₀ <T from when the answer to 4 was YES (T ₀ <T).
The predetermined time (for example, 0.2 seconds) is a delay time (Del) for preventing hunting when driving the mixed door.
ay Time). Step S2
If the answer to 5 is YES, the process proceeds to step S26, in which the mix door 11 is driven to the cool side (COOL side) by an amount corresponding to the value of the temperature deviation Tdiff, and the program ends. If the answer to step S25 is NO, the process proceeds to step S23 described above.

If the answer to step S24 is NO (T ₀ >
In the case of T), the process proceeds to Step S27, and Step S24
The answer is NO (T ₀ > T), and it is determined whether or not 0.2 seconds (predetermined time) has elapsed while T ₀ > T. This predetermined time (for example, 0.2 seconds) is also a delay time (Delay) for preventing hunting when the mixed door is driven.
Time). If the answer to step S27 is YES, the process proceeds to step S28, where the mix door 11 is driven to the heat side (HEAT side) by an amount corresponding to the value of the temperature deviation Tdiff, and the program ends. If the answer to step S27 is NO, step S27
Proceed to 23.

Thus, the absolute value of the temperature deviation | Tdi
When ff | is equal to or smaller than the first predetermined value A (A = 2 °), the absolute value | Tdiff | is smaller than 1 °, that is, the actual outlet temperature T is equal to the target outlet temperature T _0. , The opening θ of the mix door 11 is controlled.

If the answer to step S21 is B, and the process proceeds to step S29, the optimum target mix door opening θx determined by the evaporator temperature Te and the target outlet temperature T _{0 as} shown in the map of FIG. Tables are stored in memory (ROM) and stored in Te
And by search based on the T _0, obtaining the target mix door opening degree [theta] x.

Next, in step S30, step S
The absolute value of the opening deviation between the target mixed door opening θx obtained in step 29 and the mixed door opening θ detected by the mixed door opening sensor 27 is smaller than 3% (| θx−θ | <
3%). If the answer to step S30 is YES
In this case, since the actual mixed door opening θ is substantially equal to the target mixed door opening θx, the process proceeds to step S31, in which the driving of the mixed door 11 is stopped, and the program ends.

If the answer to step S30 is NO, the process proceeds to step S32, where it is determined whether or not the actual mixed door opening θ is larger than the target mixed door opening θx (θx <θ). If the answer to step S32 is YES, step S32
33 and move the mix door 11 to the opening degree deviation | θx−θ |
Drive to the cool side (COOL side) by the amount according to the value of
Exit this program. Conversely, step S32
If the answer is NO, the process proceeds to step S34, in which the mix door 11 is driven to the heat side (HEAT side) by an amount corresponding to the value of the opening deviation | θx−θ |, and the program ends.

Thus, the absolute value of the temperature deviation | Tdi
If ff | is equal to or greater than a second predetermined value B (B = 3 °), the absolute value | θx−θ |
%), That is, the opening of the mix door 11 is controlled so that the actual mixed door opening θ becomes the target mixed door opening θx.

[0042] According to the above embodiment, the actual air temperature T and the temperature deviation of the target air temperature T ₀ (| Tdiff |) when the following first predetermined value A, from the first mix door control means 22E The opening control signal is selected by the control selecting means 22G and output to the mix door drive circuit 25, so that | Tdiff | becomes smaller than 1 °, that is, T becomes T _0.
The opening of the mix door 11 is controlled so that When the temperature deviation (| Tdiff |) is equal to or larger than the second predetermined value B, the opening control signal from the second mix door control unit 22E is selected by the control selection unit 22G and output to the drive circuit 25. Thus, the opening deviation between the target mixed door opening θx and the actual mixed door opening θ (| θx−
θ |) is smaller than 3%, that is, the opening degree of the mix door is controlled such that θ becomes θx. as a result,
When the difference between the actual blow temperature T and the target blow temperature T ₀ temporarily increases when the blow mode is switched or when a sensor or the like fails, the mix door 11 is opened so that an appropriate blow temperature can be obtained. The degree can be controlled.

In the above embodiment, the absolute value | Tdiff | of the temperature deviation is set to the first predetermined value A and the second predetermined value B.
However, the present invention is not limited to this. When the absolute value | Tdiff | of the temperature deviation is equal to or less than one predetermined value C, the opening signal from the first mixed door control means is selected, and At the time of C or more, the opening signal from the second mixed door control means may be selected.

In the above embodiment, when the absolute value | Tdiff | of the temperature deviation is equal to or larger than the second predetermined value B, the opening signal from the second mix door control means is selected. Interlocking with the mode switching (when a mixed door control signal is input from the microcomputer 22 to an actuator (not shown) for driving each of the doors 16 to 18)
The opening degree control signal from the mixed door control means may be selected.

[0045]

As described in detail above, according to the vehicle air-conditioning control device of the present invention, the electronic control unit calculates the temperature deviation between the actual blowout temperature and the target blowout temperature, First mix door control means for outputting an opening control signal for controlling the opening of the mixed door so that the actual outlet temperature becomes the target outlet temperature based on the temperature deviation; and a target mix door based on the target outlet temperature. Target mixed door opening calculating means for calculating the opening, second mixed door controlling means for outputting an opening control signal for controlling the mixed door so that the opening becomes the target mixed door opening, temperature When the deviation is equal to or less than a predetermined value, the opening degree control signal from the first mix door control means is selected, and when the temperature deviation is equal to or more than a predetermined value or in conjunction with switching of the blowing mode, the second mix door A control selection means for selecting an opening control signal from the control means and outputting each opening control signal to the mixed door driving means, so that a temperature deviation between the actual blowout temperature and the target blowout temperature is predetermined. If the value is less than or equal to
The opening control signal from the first mixing door control means is selected by the control selecting means and output to the mixing door driving means, whereby the opening degree of the mixing door is controlled so that the actual blowing temperature becomes the target blowing temperature. When the temperature difference between the actual blowout temperature and the target blowout temperature is equal to or greater than a predetermined value or in conjunction with the switching of the blowout mode, the opening control signal from the second mix door control means is selected by the control selection means and the mix door is selected. This is output to the driving means, whereby the opening of the mix door is controlled to the target mix door opening. Therefore, even when the difference between the actual blowout temperature and the target blowout temperature becomes large, such as when the blowout mode is switched or when a sensor or the like fails, the opening of the mix door is adjusted so that an appropriate blowout temperature can be obtained. Can be controlled.

Also, only when the difference between the actual blowout temperature and the target blowout temperature is small, the opening degree of the mix door is controlled so that the actual blowout temperature becomes the target blowout temperature. Hunting of the mixed door can be prevented.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a vehicle air-conditioning control device according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram illustrating a vehicle air conditioning control device according to one embodiment of the present invention.

FIG. 3 is a flowchart illustrating a control procedure of automatic air conditioning control by the vehicle air conditioning control device according to one embodiment.

FIG. 4 is a flowchart showing a subroutine of mixed door control, which is combined with the flowchart of FIG. 5 at points A ′ and B ′ to constitute one flowchart.

FIG. 5 is a flowchart showing a subroutine of mix door control together with FIG. 4;

FIG. 6 is a diagram showing a map of a target mix door opening degree.

[Explanation of symbols]

Reference Signs List 11 mixed door 12 mixed door actuator (mix door driving means) 13-15 outlet 19-19 outlet temperature sensor 22 microcomputer (electronic control unit) 22C temperature deviation calculating means 22D target mixed door opening degree calculating means 22E first Mix door control means 22F Second mix door control means 22G Control selection means 25 Mix door drive circuit (mix door drive means)

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B60H 1/00 101 B60H 1/00 103

Claims (1)

(57) [Claims] An actual outlet temperature calculated based on an output from each outlet temperature sensor provided in each outlet and an outlet temperature sensor in accordance with an outlet mode is calculated based on a vehicle interior temperature, a set temperature, and the like. An air-conditioning control device for a vehicle, comprising: an electronic control unit that outputs an opening control signal to a mix door driving unit so as to reach a target blowout temperature, and controls an opening of the mix door through the driving unit. The electronic control unit is configured to calculate a temperature deviation between the actual blowout temperature and the target blowout temperature.
First mix door control means for outputting an opening control signal for controlling the opening of the mix door so that the actual outlet temperature becomes the target outlet temperature; and a target mix door opening based on the target outlet temperature. , A second mixed door control means for outputting an opening control signal for controlling the mixed door so that the opening is equal to the target mixed door opening, and When the deviation is equal to or less than a predetermined value, an opening control signal from the first mixed door control means is selected, and when the temperature deviation is equal to or more than a predetermined value or in conjunction with switching of a blowing mode, the second mix door is controlled. A control selecting means for selecting an opening control signal from the control means and outputting each opening control signal to the mixed door driving means.