JP2732130B2 - Vehicle air conditioning controller - Google Patents

Description

The present invention relates to an air conditioning control device for a vehicle that controls a head temperature of an occupant by using a cool air bypass unit.
The present invention relates to an air conditioning control device for a vehicle that changes a blowing amount of a blower according to an air mixing door opening.

(Prior Art) Conventionally, at the time of solar radiation, by directing the cool air before passing through the heater core to the upper body (head) of the occupant, it is possible to prevent the temperature of the upper body (head) of the occupant from excessively rising due to the solar radiation. Prevention has been made. For example,
In Japanese Patent No. 497, a cool air bypass duct is provided to directly guide the cool air immediately after passing through the evaporator to the occupant's head. This prevents the air conditioning feeling near the occupant's head from deteriorating.

(Problems to be Solved by the Invention) However, in the above-described conventional example, the correction amount of the temperature near the head (or the temperature in the vehicle compartment), which is achieved by controlling the cool air bypass door at the time of sunlight, is set in advance. And the difference in the sensations of the individual occupants (difference in taste)
Had the drawback of not being able to cope. Further, in the control of the cool air bypass door, as the opening of the air mix door approaches the full cool side, the temperature of the air flowing through the cool air bypass duct is reduced in temperature difference from the temperature of the air flowing through the air conditioning duct. Therefore, the change width of the temperature of the air blown out from the vent outlet by the control of the cool air bypass door is small, so that a constant comfortable feeling change cannot always be obtained.

Therefore, the present invention provides a cool air bypass door control range by compensating for a change in the temperature of the cold air bypass door by controlling the opening degree of the cool air bypass door, even when the air mix door approaches the full cool side, with a change in the amount of blown air. It is an object of the present invention to provide a vehicle air-conditioning control device in which a uniform feeling change is always felt.

(Means for Solving the Problems) However, as shown in FIG. 1, the gist of the present invention is a cold air bypass door 21 and the cold air bypass door 21 which is provided in a bypass passage and immediately after passing through an evaporator. Air conditioning equipment 7, 8, 10, 9 etc. including a cool air bypass duct 20 for guiding air into the vehicle interior, head temperature setting means 39 for arbitrarily setting the temperature near the occupant's head, at least the interior temperature of the vehicle A total signal calculating means 100 for calculating a total signal corresponding to the heat load in the vehicle compartment based on the outside air temperature and the set temperature in the vehicle compartment
And a total head signal calculating means 110 for calculating a total head signal corresponding to a thermal load near the occupant's head based on at least the head setting temperature and the amount of solar radiation by the head temperature setting means 39.
An air mixing door opening calculating means 120 for calculating a target opening of the air mixing door 10 based on a calculation result of the total signal calculating means 100; A basic air volume calculating means 130 for calculating the air volume and a correction amount added to the basic air volume based on the air mixing door opening amount, and a blower is provided based on the correction amount and the calculation result of the head total signal calculating means 110. 7 and a correction means 150 for determining the target airflow by adding the increased airflow by the increased airflow calculation means 140 to the basic airflow and driving the blower 7. is there.

(Operation) Therefore, a total signal is calculated by the total signal calculating means 100 based on the vehicle interior temperature, the outside air temperature, the amount of solar radiation, the vehicle interior set temperature, and the like, and the head is set based on the head set temperature, the solar radiation amount, and the like. The head total signal is calculated by the total signal calculation means 110. Then, the target opening of the air mix door 10 is calculated by the air mix door opening calculation means 120 based on the calculation result of the total signal calculation means 100. Next, the basic air volume in the control of the blower 7 is calculated by the basic air volume calculating means 130 based on the calculation result of the total signal calculating means 100, and the target opening degree of the air mix door 10 is calculated by the increased air volume calculating means 140. A correction amount for controlling the blower 7 is calculated based on the calculated value, and an increased air amount of the blower 7 is calculated based on a value obtained by adding the control value of the head total signal to the correction amount. Then, the correction unit 150 compares the basic air volume of the blower 7 with the air volume obtained by adding the increased air volume to the minimum air volume in the basic air volume, and determines the larger air volume as the target air volume of the blower 7. As described above, the amount of air to be increased by the blower 7 is controlled in accordance with the degree of opening of the air mix door 10.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In FIG. 2, the air-conditioning control device for a vehicle is provided with an intake door switching device 2 at the most upstream side of the main passage 1, and the intake door switching device 2 is divided into an inside air inlet 3 and an outside air inlet 4 at the inside and outside. An air switching door 5 is arranged, and the inside and outside air switching door 5 is operated by an actuator 6 so that air to be introduced into the main passage 1 can be selected between internal air circulation and external air introduction.

The blower 7 sucks air into the main passage 1 and blows the air downstream. An evaporator 8 is provided behind the blower 7.
And a heater core 9. Evaporator 8
Is connected to a compressor and a condenser (not shown) by piping to form a cooling cycle, and cools the air sucked into the main passage 1.
Is arranged so that cooling water of an engine (not shown) circulates to heat the air.

An air mix door 10 is provided in front of the heater core 9 described above.
Is provided by adjusting the opening theta ₁ of the air mix door 10 by an actuator 11, and air passing through the heater core 9, the amount of air bypassing the heater core 9 is changed, as a result, the main passage 1 The temperature of the air blown from the downstream side is controlled.

The opening 開₁ of the air mix door 10 is 0% when the position of the air mix door 10 is at the full cool position (I position), and 100% when the air mix door 10 is at the full heat position (II position).

The downstream end of the main passage 1 is connected to a defrost outlet.
12 、 Vent outlet 13 and heat outlet 14
The mode doors 16, 17, 18 are provided at the divided portions, and the mode doors 16, 17, 18 are
The desired blowing mode can be obtained by operating with.

Further, the vehicle air conditioning control device is provided with a cool air bypass duct 20 that bypasses a part of the main passage 1.
One end of the cool air bypass duct 20 is located downstream of the evaporator 8 and upstream of the air mixing door 10 in the main passage 1, and the other end is opened before the vent outlet 13. Part of the air that has passed through 8 can be supplied directly to vent outlet 13. Then, cool air quantity supplied through the cool air bypass duct 20 is adapted to be adjusted by controlling the opening theta ₂ of the cool air bypass door 21 by an actuator 22.

Reference numeral 25 denotes a vehicle interior temperature sensor that detects a representative temperature Tr in the vehicle interior, and is mounted near a control panel 37 described later. Reference numeral 26 denotes a head temperature sensor for detecting the head temperature Th of the occupant, which is attached to a ceiling or the like near the head in the passenger compartment 15. 27 is an outside air temperature sensor that detects the temperature Ta outside the vehicle compartment, 28 is a solar radiation sensor that detects the amount of solar radiation Ts,
Reference numeral 29 denotes a mode sensor which is provided immediately after the evaporator 8 or the evaporator 8 and detects the cooling capacity of the air by the evaporator 8 as the temperature of the evaporator 8 or the temperature of the air passing through the evaporator 8. MPX) 31, and then converted into a digital signal by the A / D converter 32 and input to the microcomputer 33. Furthermore, 34 bypass door opening detector for detecting the opening theta ₂ of the cool air bypass door 21, 35 is a position detector for detecting the position of the mode doors 16, 17, 18, 36 of the air mixing door 10 opening This is an air mix door opening detector that detects も₁ , and these output signals are also input to the microcomputer 33 via the multiplexer 31 and the A / D converter 32, respectively.

Further, the microcomputer 33, control panel 37, the output from the head temperature setter 39 for setting the passenger compartment temperature setting device 38 and a head set temperature T _hset for setting the passenger compartment temperature setting T _set A signal is input.

The control panel 37 sets the blowing mode to VENT mode, BI-L mode, HEAT mode, DEF / HEAT mode DEF.
Mode switches 40a to 40e for manually setting the mode,
The A / C switch 41 for moving the cooling cycle and the rotation speed of the blower 7 are set to low speed (FAN1), medium speed (FAN2), and high speed (FAN).
N3) are provided with fan switches 42a to 42c, an AUTO switch 43 for automatically controlling all the air conditioners such as the blower 7, and an OFF switch 44 for stopping the drive of the air conditioners.

The vehicle interior temperature setting device 38, an up-down switch 45a, and 45b, made of a display unit 46 for displaying the set temperature T _{The set,} the set temperature shown in the display unit 46 in up-down switch 45a, 45b operations T _set can be changed within a predetermined range. The head temperature setting device 39
Comprises a dial-type knob 47, for example, and has a head setting temperature T within a predetermined range (COLD to WARM).
_hset can be changed. The vehicle interior temperature setting device 38 and the head temperature setting device 39 may be of a type in which a template bar is slid.

The microcomputer 33 has a central processing unit (CPU), a read-only memory (ROM), a random access memory (RAM), an input / output port (I / O), and the like (not shown). Based on various input signals, control signals are output to the actuators 6, 11, 19, 22 and the motor of the blower 7 through drive circuits 48a to 48e, respectively, and the doors 5, 10, 16, 17, 18, 18, 21 Control, motor rotation control, and the like.

Next, a control operation example of the microcomputer 33 will be described. FIG. 3 shows a flowchart of a main routine including a process of controlling the air volume of the blower according to the opening of the air mix door. Starting from step 50, in step 52, data input for inputting respective detection values of the vehicle interior temperature sensor 25, the head temperature sensor 26, the vehicle exterior temperature sensor 27, the solar radiation sensor 28, the mode sensor 29, etc. to the microcomputer 33. Perform processing. In the next step 54, the data of the set temperature by the up / down switches 45a and 45b of the temperature setter 38 and the data of the set temperature by the head temperature setter 39 are input to the microcomputer 33, and the process proceeds to step 56. In step 56 performs a calculation of the overall signal T _1. The calculation of the total signal T ₁ is as follows: T ₁ = Tr + KaTa +, where Tr is the vehicle interior temperature, Ta is the outside air temperature, Ts is the amount of solar radiation, and T _set is the vehicle interior set temperature.
_{KsTs + K set T set + C} 1 ( where, Ka, Ks, K _set gain constants, C ₁ is processing constant) carried by. Performing the calculation of head comprehensive signal T ₂ is in the next step 58. This head comprehensive signal T ₂
Is calculated _assuming that the head set temperature is T _hset , T ₂ = aTs + bT
_hset (a and b are constants). Next Step 60
In performs calculation for determining the target opening theta ₁ of the air mixing door 10 based on the overall signal T ₁ of the calculation result of Step 56,
Proceed to step 62. In step 62, as shown in FIG. 4, performs a computation for determining the basic air volume Bb of the blower 7 on the basis of the overall signal T ₁ of the calculation result of Step 56, the process proceeds to step 64. In step 64, the head total signal in step 58
The opening degree of the cool air bypass door 21 based on the calculation result of T ₂ Θ ₂
Is calculated. This is because, as shown in FIG. 5, the opening theta ₂ of the cool air bypass door 21 as control value of the head overall signal T ₂ is biased from the reference value 0 in the negative direction is reduced (approaching full cool), the reference opening theta ₂ increases as deviated from the value 0 in the positive direction (closer to the Furuhito). Thereafter, the flow proceeds to a blower air volume control routine of step 66 (described later). Step 66 is the air mix door
Performs control such that increasing the air volume of the air blowing device 7 carries out an operation of correction air volume of the blower 7 in accordance with the opening degree theta ₁ of 10. And controls the air mix door 10 by driving the actuator 11 so that the target opening theta ₁ of the air mix door 10 which is calculated in the step 60 in the next step 68, step 70
Proceed to. In step 70, the actuator 22 is driven to control the cool air bypass door 21 so that the target opening degree of the cool air bypass door 21 calculated in step 64 becomes 前 記₂ ,
Go to return step 72.

Next, control of a flowchart of the blower air volume increase control routine shown in FIG. 6 will be described. Starting from step 80, in step 82, it is determined whether or not the blowing mode is the vent mode.
If O, go to step 83. In step 83, it is determined whether or not the blowing mode is the bi-level mode. If YES, the process proceeds to step 84, and if NO, the process proceeds to step 92. As shown in FIG. 7 At the step 84, the control correction amount of the blower 7 on the basis of the opening theta ₁ of the air mixing door 10 C
Calculate ₀ (increased air volume). That is, the air mix door 10
Control correction amount of the blower 7 in accordance with the target opening theta ₁ of approaches full-cool side is relatively small is 50% or less
C ₀ also increases. Thereafter, the flow advances to step 86. On the other hand, in step 92, the total signal T ₁ as shown in FIG. 4
The motor (not shown) of the blower 7 is driven with the blower basic airflow Bb calculated based on the above as a target airflow, and the process proceeds to a return step 94 to return to the main routine described above. In step 86, as shown in FIG. 8, an increase airflow B _UP (blower 7 of the blower 7 on the basis of a value obtained by adding the control correction amount C ₀ head overall signal T ₂ calculated in the step 58 (Voltage applied to the motor). To explain the relationship between the head overall signal T ₂ and the increased air volume B _UP at this time from FIG. 9, in the plus direction of the change in the control value of the head overall signal T _2, the air mix door 10 opening degree Θ _{When 1} is 0% (full cool) (shown by a solid line) and when it is 50-100% (full heat) (shown by a broken line), the rise of the increased airflow B _UP is 0% faster. In the full cool mode, the air volume of the blower 7 is immediately increased. Thereafter, the process proceeds to step 88. In step 88, the blower basic air volume Bb and the Low
The value obtained by adding the increased air volume B _UP to the air volume Lo at the time of setting (Lo +
B _UP ), and if Lo + B _UP > Bb, the routine proceeds to step 90, and if Lo + B _UP ≦ Bb, the routine proceeds to step 92. The combined value (Lo + B _UP), as shown in FIG. 5, the head overall signal T ₂
Is reflected in the blower control as it deviates from the reference value 0 in the plus direction. In the step 90, a value obtained by adding the increased air volume B _UP to the air volume Lo at the time of setting the Low (Lo + B _UP )
Is set as the target air volume, the motor of the blower 7 is driven, and the process proceeds to the return step 94 to return to the main routine.

Thus, the cool air bypass door 21 by the head Overall signal T ₂ calculated based on the setting values of the head temperature setting machine 39
Together but controlled, increased air volume B _UP of the blower 7 is calculated in accordance with the opening theta ₁ of the air mixing door 10, the larger in comparison with the basic air volume Bb of the blower 7 without the addition of this increased air volume B _UP The air volume is used as the target air volume of the blower 7.

(Effects of the Invention) As described above, according to the present invention, the air volume of the blower is appropriately controlled according to the opening degree of the air mixing door. Air conditioning feeling near the head can be obtained. That is, since the decrease in the temperature change width due to the cool air bypass door control that occurs when the opening degree of the air mix door decreases and approaches full cool is compensated by increasing the air volume of the blower, the cool air bypass effect does not decrease. Thus, a stable and uniform feeling change can always be obtained.

[Brief description of the drawings]

FIG. 1 is a functional block diagram showing the configuration of the present invention, FIG. 2 is a configuration diagram showing a vehicle air-conditioning control device according to an embodiment of the present invention, and FIG. 3 is a flowchart showing a main routine of the microcomputer used in the embodiment. FIG. 4 is a characteristic diagram showing the basic airflow of the blower based on the total signal, FIG. 5 is a characteristic diagram of the cool air bypass door control and the blower control based on the total head signal, and FIG. 6 is used in the embodiment. 7 is a flowchart showing a blower air flow increase control routine of the microcomputer, FIG. 7 is a characteristic diagram of a blower control correction amount based on an air mix door opening degree, FIG. 8 is a characteristic diagram of a blower increase air flow based on a head total signal, FIG. 9 is a characteristic diagram showing the relationship between the head total signal and the increased airflow. 7 ... Blower, 8 ... Evaporator, 10 ... Air mix door, 20 ... Cool air bypass duct, 21 ... Cool air bypass door,
25: vehicle interior temperature sensor, 27: outside air temperature sensor, 28: solar radiation sensor, 33: microcomputer, 38: vehicle interior temperature setting device, 39: head temperature setting device, 100: total signal calculation means, 1
10 ... head total signal calculation means, 120 ... 0 mixed door opening calculation means, 130 ... basic air flow calculation means, 140 ... increased air flow calculation means, 150 ... correction means.

Continued on the front page (72) Inventor Akihiko Takano 39, Higashihara, Chiyo-ji, Chiyo-ji, Konan-cho, Osato-gun, Saitama Prefecture (72) Inventor Hideo Yamaguchi 3-1, Fuchi-cho, Fuchu-cho, Aki-gun, Hiroshima Pine (72) Inventor Teruaki Yano 3-1 Shinchi, Fuchu-cho, Aki-gun, Hiroshima Prefecture Inside Mazda Co., Ltd. (56) References JP, Y2)

Claims (1)

(57) [Claims] 1. An air conditioner including a cool air bypass door, a cool air bypass duct having the cool air bypass door in a bypass passage and guiding air immediately after passing through an evaporator into a vehicle interior, and optionally controlling a temperature near an occupant's head. Head temperature setting means for setting at least; head signal temperature calculating means for calculating a total signal corresponding to a heat load in a vehicle cabin based on at least a vehicle cabin temperature, an outside air temperature and a vehicle cabin set temperature; A total head signal calculating means for calculating a total head signal corresponding to a thermal load near the occupant's head based on the head setting temperature and the amount of solar radiation by the setting means; Air mix door opening calculating means for calculating a target opening of the mixed door; and basic air flow calculating for calculating a basic air flow of the blower based on a calculation result of the total signal calculating means. A step for calculating a correction amount to be added to the basic air flow based on the air mixing door opening amount, and calculating an air flow increase for the blower based on the correction amount and the calculation result of the head total signal calculation means. A vehicle air-conditioning control device comprising: means for correcting a target air flow by adding an increased air flow by the increased air flow calculating means to the basic air flow, and driving a blower.