JPH10138740A - Air conditioner for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically and speedily carry out unlocking by small data quantity by furnishing a motor unlocking means to output a stop signal at the time when an actuator working signal continuous for more than prescribed length of time in a detection region exceeding an actual opening region of a door and a set region of target door opening. SOLUTION: A door actuator 40 is furnished with a motor 40a to open and close a door such as a air mix door 33, etc., a door opening sensor 40b and a signal processing circuit thereafter, target door opening is decided by finding deviation between set temperature set and cabin air temperature by a door opening setting means 71 and adding and subtracting constant opening to and from previous target door opening by a target door opening decision means 51. Thereafter, electrification to the motor 40a is controlled in accordance with deflection of the target door opening and actual door opening by the signal processing circuit 40c, but when an actuating signal of the actuator 40 continues for more than specified time in the neighborhood of full-shut and full-open, a stop signal is output and unlocking is carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle air system in which an air conditioner control unit and a door actuator are formed into a local area network (hereinafter also referred to as a LAN), and a door opening is controlled using a target door opening. More particularly, the present invention relates to a LAN-equipped vehicle air conditioner having a door actuator motor unlocking function.

2. Description of the Related Art In a conventional automobile air conditioner equipped with a microcomputer, an intake door, an air mix door and a mode door are automatically opened and closed by an electric actuator based on a target opening signal calculated by the microcomputer. Controlled. At that time, in order to feed back the actual opening of each door to the microcomputer, a rotation position signal of the electric actuator is transmitted to the microcomputer. In order to transmit and receive such control signals, it is necessary to electrically connect a microcomputer built in the air conditioner amplifier unit and an electric actuator attached to the air conditioner unit with several tens of harnesses. In addition, since the opening position required for each of the intake door, the air mix door and the mode door is also different from each other, the electric actuator is also used in an operation type corresponding to each door,
It could not be shared. For this reason, information communication between the air conditioner amplifier unit and the electric actuator is converted into a local area network to reduce the number of harnesses as transmission media and to integrate the electric actuator. In this type of air conditioner for a vehicle in a LAN, an electric actuator is equipped with an IC chip constituting a signal processing circuit, and data is transmitted and received between the IC chip and a microcomputer of an air conditioner amplifier unit. Since the feedback of the actual opening position of the door is self-processed by the electronic circuit including the IC chip in the electric actuator, the number of harnesses can be reduced and at the same time the opening position control according to each door in this electronic circuit. Thus, the electric actuator can be shared.

By the way, in a conventional automobile air conditioner equipped with a microcomputer, a door opening detection sensor called a potentiometer balance register (PBR) 40b is built in the actuator 40. To explain the case of controlling the air mix door 33 shown in FIG. 8, the position between the position where the front surface of the heater core 32 is fully closed and the position where it is fully opened (hereinafter, this range is referred to as an actual door opening region Rd) is rotated. For the moving air mix door 33, the PBR detection region Rpbr was set to be narrower than the actual door opening region Rd. Then, when the air mix door 33 is operated to either fully open or fully closed, the actual door opening becomes the detection region Rpbr of the PBR 40b.
In this case, the power supply is stopped by the power supply circuit pattern of the actuator 40, for example, so that the lock of the actuator motor 40a can be prevented. This is because all data relating to the electric actuator 40 such as a position signal necessary for preventing motor lock is transmitted to the microcomputer 50, and all information processing is performed here. However, in the above-described LAN-equipped vehicle air conditioner, the actual door opening is self-processed in the actuator so that the actual door opening coincides with the target door opening output from the microcomputer. 8, the detection region Rpbr of the PBR 40b cannot be set narrower than the actual door opening region Rd as in the conventional vehicle air conditioner shown in FIG. In this case, the self-process for matching the target door opening degree beyond the PBR detection region cannot be executed. Further, if the target door opening setting area is narrower than the actual door opening area, the door will not be fully opened or fully closed. For this reason, in the LAN-equipped air conditioner for a vehicle, the detection area Rpbr of the PBR and the setting area of the target door opening are made to coincide with the actual door opening area Rd, but the door mounting error and the correlation between the door and the PBR. There is a problem that a motor lock state occurs at either the fully open position or the fully closed position due to a relational error or the like, and the life of the motor is shortened. The locked state of the motor referred to here means that the actual door opening detected by the PBR has not yet reached the dead point even though the door has actually reached the dead point of either fully open or fully closed. Means that the current is continuously supplied to the motor so as to match the target door opening. In addition, since there is no need to feed back the position signal of the electric actuator to the microcomputer, the data length transmitted from the electric actuator to the microcomputer during the communication format is determined only by the fact that the electric actuator is operating (high-level signal ) Or stopped (low level signal). as a result,
Even when a high level signal is being transmitted to the microcomputer side, it is not possible to determine whether the electric actuator is operating normally or the motor is locked by using only this signal. Although this problem can be solved by increasing the data area related to the operation status of the electric actuator in the communication format, this is not preferable because other data areas such as the target door opening signal are eroded. SUMMARY OF THE INVENTION It is an object of the present invention to provide a LAN-equipped vehicle air conditioner having an actuator motor unlocking function without changing a communication format.

According to the present invention, there is provided a target door opening which determines a target door opening which is arithmetically processed by a microcomputer in accordance with each sensor and each switch input. Determining means; a door opening detecting means for detecting an actual opening of the door; receiving data of the target door opening determined by the target door opening determining means, and detecting the data by the door opening detecting means. An actuator having signal processing means for operating the door so that the actual door opening coincides with the target door opening; and an air conditioner for a vehicle in which an operation signal and a stop signal of the actuator are output from the actuator. In the apparatus, a detection area (Rpbr) in the door opening detecting means and a target door opening setting area in the target door opening determining means (Rpbr). x) is set wider at both ends thereof than the actual opening area (Rd) of the door, and in the detection area and the target door opening setting area exceeding the actual opening area of the door, An air conditioner for a vehicle is provided, further comprising a motor unlocking means for outputting a stop signal to the actuator when an operation signal from the actuator continues for a predetermined time or more. In this vehicle air conditioner, the actual door opening is self-processed in the actuator so that the actual door opening matches the target door opening output from the target door opening determining means.
The detection area of the actual door opening and the setting area of the target door opening cannot be set narrower than the actual door opening area, but can be set wider. Further, since the data length outputted from the actuator is small, it is not possible to diagnose the locked state of the actuator motor using only this signal, but at least two types of signals, the operation signal and the stop signal of the actuator, can be obtained. . Based on such knowledge, the present inventors set the detection area in the door opening detection means and the target door opening setting area in the target door opening determination means at both ends of the door than the actual opening area. A stop signal is output to the actuator when the operation signal from the actuator continues for a predetermined time or more in the detection area beyond the actual opening area of the door and in the setting area of the target door opening while being set widely. Motor lock release means is provided. That is, in this automotive air conditioner,
Since it is difficult to control the door to stop immediately before it is fully opened or fully closed, it is necessary to set the door so that it can be rotated to the area where the motor is locked intentionally. When the motor stops, the motor lock is released to protect the motor. Here, the detection area in the door opening detection means and the setting area of the target door opening in the target door opening determination means are set wider at both ends than the actual opening area of the door, thereby intentionally setting the motor lock. The door can be pivoted to the area where the door moves. Also, since the operation waits until the operation signal from the actuator continues for a predetermined time or more, the door is operated during the predetermined time, so that there is an error between the target door opening and the actual door opening. You can close the door completely. Setting the detection area in the door opening detection means wider at both ends thereof than the actual opening area of the door can be easily realized by, for example, increasing the range of the resistance pattern in the case of a potentiometer. ,on the other hand,
Setting the target door opening setting area in the target door opening determining means wider at both ends thereof than the actual opening area of the door can be easily performed by changing the program software of the target door opening determining means. Can be realized. Further, since only the operation signal is detected from the actuator, even if the output signal from the actuator is only two types of signals, it can be controlled only by this, and there is no need to provide a dedicated detection signal separately. The actuator in the present invention includes all actuators used in automotive air conditioners, such as intake door actuators, air mix door actuators, mode door actuators, and auxiliary door actuators such as bypass doors. Is not limited. In the case of an intake door, bypass door or mode door actuator, the door opening selected by the occupant is mainly used as the target door opening and transmitted to the actuator, and the door is operated after being compared with the actual opening. However, when the automatic control mode is selected, the target door opening degrees for these actuators may be calculated and determined based on the temperature set by the occupant selection and a predetermined program. . In the case of an actuator for an air mix door, although not limited, since it is necessary to precisely control the door opening, when determining the target door opening,
Considering the temperature influence factors that are considered to affect the cabin temperature, first determine the temperature deviation between the set temperature and the cabin temperature,
It is preferable to determine the target door opening based on the temperature deviation. In the present invention, particularly, an operation signal of a target door opening is output from the air conditioner amplifier unit to the actuator, and a signal processing for matching an actual door opening detected by the actuator with the target door opening is performed. It is preferable to be applied to what is performed, in particular, data in which the data transmitted from the actuator to the air conditioner amplifier unit is mainly only the operation signal and the stop signal. In this type of vehicle air conditioner, data that is preferable for use in preventing motor lock, such as actual opening degree data of an actuator, is self-processed in the actuator and does not need to be transmitted to the air conditioning amplifier unit. Is only required to have an operation signal and a stop signal. Therefore, according to the present invention, it is possible to unlock the actuator motor with a 1-bit data amount without using data exclusive for motor lock prevention.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a vehicle air conditioner of the present invention (corresponding to claims), FIG. 2 is a block diagram showing an embodiment of the vehicle air conditioner of the present invention,
3 is a system diagram of the embodiment, FIG. 6 is a diagram showing a communication format exchanged between the air conditioner amplifier unit and the actuator shown in FIG. 2, and FIG. 7 is a waveform showing a return signal from the actuator shown in FIG. FIG. First, FIG.
And the air conditioner 1 for a vehicle according to the present embodiment shown in FIG.
The configuration of the mechanical system No. 00 will be described. As shown in FIG. 3, the automotive air conditioner 100 includes an intake unit 10, a cooler unit 20, and a heater unit 30, and has an intake unit case 11, a cooler unit case 21, and a heater unit case 31, respectively. Connected in order. The intake unit case 11 has an outside air intake 12 for taking in air outside the vehicle compartment and an inside air intake 1 for circulating room air.
3 are formed. The inside air intake 13 is formed directly in the intake unit case 11 while the outside air intake 12 communicates with the intake formed in the cowl panel of the vehicle body via an air duct. An intake door 16D is rotatably provided in the intake unit case 11, and a position for completely closing the outside air intake 12 (inside air circulation mode) and a position for completely closing the inside air intake 13 (outside air intake mode). And stops at the intermediate position (inside / outside air intake mode) as necessary. The rotation of the intake door 16D is performed by an intake door actuator 41 similarly attached to the intake unit case 11. The intake of inside air and / or outside air is performed by a fan 15 rotated by a fan motor 14, and the fan motor 14 is controlled via a fan control circuit 45 based on an operation signal transmitted from an air conditioner amplifier unit 50. The cooler unit case 21 is provided with an evaporator (condenser) 22 for cooling the intake air. The evaporator 22 uses the evaporator 22 to cool the compressor, condenser (evaporator), expansion valve, liquid tank and the like. This is one element of a cooling cycle configured by connecting with piping. The operation and stop of the cooling cycle are performed by an air conditioner switch of a control panel 70 provided on an instrument panel in the vehicle compartment. In the present invention, the cooler unit 20 may be omitted. Heater unit 3
0 is intake unit 10 and cooler unit 2
It has the function of controlling the temperature of the air passing through zero and distributing conditioned air from a desired outlet to the vehicle interior. For this purpose, a heater core 32 is provided in the heater unit case 31 so as to form a bypass passage 37, and the amount of air passing through the heater core 32 and the bypass passage 37 are provided by an air mix door 33 provided on the front surface of the heater core 32. The ratio of the amount of air that passes through is adjusted.
The engine coolant of the vehicle circulates through the heater core 32, and the air is heated by heat exchange between the engine coolant and the air. The air mix door 33 is
The air mix door actuator 43 rotates between a position where the front surface of the heater core 32 is fully closed (full cool) and a position where the bypass path 37 is fully closed (full hot). An air mix chamber 39 is formed on the downstream side of the heater unit case 31, and a vent outlet 3 is provided here.
4. A defrost outlet 35 and a foot outlet 36 are formed. The vent outlet 34 is connected to a vent grill provided on the front of the instrument panel in the vehicle interior via an air duct, and blows out conditioned air mainly toward the upper body of the occupant. The defrost outlet 35 is connected to a defrost grill provided on the upper surface of the instrument panel via an air duct, and blows out low-humidity air or warm air toward the inner surface of the windshield to remove fogging. The foot outlet 36 is opened directly below the foot of the occupant in the vehicle interior from the heater unit case 31 or through a short air duct, and blows out hot air mainly toward the foot of the occupant. In addition, each outlet 34, 35, 3
6 is provided with a vent door 34D, a differential door 35D, and a foot door 36D so as to be able to open and close respective outlets. These doors 34D, 35D, 36D are operated by a mode door actuator 44 via a link mechanism or the like. In other words, these doors are operated according to the combination of opening and closing of the three doors 34D, 35D, 36D by selecting various blowing modes such as the vent mode, the defrost mode, the bi-level mode, and the foot mode. For example, in the bi-level mode, the vent outlet and the foot outlet are each half-opened, and cool air is blown out of the vent outlet and warm air is blown out of the foot outlet, so that a so-called head-and-foot-type thermal control is performed. In the automotive air conditioner 100 of the present embodiment, a second bypass passage 38 is formed in the heater unit case 31, and a bypass door 38D for fully closing and fully opening the second bypass passage 38 is further provided. The bypass door 38D is operated by a bypass door actuator 42,
When the air is rotated to the fully open position of the heater core 32 to guide the warm air to the foot outlet 36, the bypass door 38D is fully opened to guide the cool air to the vent outlet, thereby reducing the temperature difference in the head-to-foot thermal type temperature control. To enhance. In the present invention, the second bypass path 38 and the bypass door 38D may be omitted. Next, the configuration of the control system of the automotive air conditioner 100 of the present embodiment will be described. As shown in FIG. 3, the vehicle air conditioner 100 according to the present embodiment
Is an air conditioner amplifier unit 50, various sensors 61 to
66 and a control panel 70. The air conditioner amplifier unit 50 has a built-in microcomputer, performs arithmetic processing on input signals from various sensors 61 to 66 and switches of the control panel 70, which will be described later, according to program software, and executes a fan motor 14, door actuators 41 to 44. , And a compressor (not shown) are comprehensively controlled. Although details will be described later, the target door opening degree determining means 51 and the motor unlocking means 52 according to the present invention shown in FIG. 1 and the vehicle interior air temperature estimating means 53 and the temperature deviation calculating means 54 shown in FIG. Specifically, the amplifier unit 50 includes a CPU, a ROM, and a RAM of a microcomputer. Among the sensors, a water temperature sensor 61 is a sensor that detects the temperature of the engine cooling water, is provided in the engine cooling water circuit, converts the water temperature into a resistance value, and outputs the resistance value to the air conditioner amplifier unit 50. The refrigerant temperature sensor 62 is a sensor that detects the temperature of the refrigerant circulating in the cooling cycle, and is attached, for example, to the inlet side of the evaporator 22, converts the refrigerant temperature into a resistance value, and outputs the resistance value to the air conditioner amplifier unit 50. The inside air sensor 63 is a sensor that detects the actual air temperature in the vehicle compartment, and is provided, for example, on the front surface of the instrument panel, converts the room temperature Tinc into a resistance value, and outputs the resistance value to the air conditioner amplifier unit 50. The outside air sensor 64 is a sensor that detects an actual air temperature outside the vehicle compartment, and is provided in, for example, a hood lock stay, converts the outside air temperature Tam into a resistance value, and converts the outside air temperature Tam into a resistance value.
Output to The solar radiation sensor 65 detects the amount of solar radiation Qsun entering the room from the windshield with a photodiode,
A sensor that outputs a current value to the air conditioner amplifier unit 50, and is provided, for example, on the upper surface of an instrument panel. The suction temperature sensor 66 is a sensor that detects the temperature of the air after passing through the evaporator 22, is provided in the cooler unit 20, converts the suction temperature Tint into a resistance value, and outputs the resistance value to the air conditioner amplifier unit 50. A signal based on a resistance value or a current value output from each of the sensors 61 to 66 to the air conditioner amplifier unit 50 is converted into a voltage value by the air conditioner amplifier unit 50 and input. The control panel 70 is mounted at the center of the instrument panel which is easy for the occupant to operate. It has a display panel 72 for displaying speed, temperature, and the like, and a communication interface 73 for communicating data with the air conditioner amplifier unit 50. In the air conditioner for a vehicle according to the present invention shown in FIG.
For example, it corresponds to a balance control lever, a blow mode switch, or a forced air circulation switch. The door actuator 40 (41 to 44) described above is a motor 4 for mechanically opening and closing the door as shown in FIG.
0a, a door opening sensor (door opening detecting means) 40b for converting the door opening into a voltage value and detecting the same, and a signal processing circuit 40c composed of an IC chip or the like. When the target door opening Xpbr is determined by the air conditioner amplifier unit 50, the data of the target door opening is received by the signal processing circuit 40c.
0c so that the actual door opening X detected by the door opening sensor 40b matches the target door opening.
Apply current to Particularly, in this embodiment, the door opening sensor 4
As shown in FIG. 1, the detection area Rpbr at 0b is set wider at both ends thereof than the actual opening area Rd of the door. Specifically, the resistance pattern of the potentiometer balance register PBR is Is formed to be wider than the rotation range. Thereby, even if an error occurs between the door installation error and the target door opening Xpbr and the actual door opening, the actual door opening is detected in a region beyond the designed door opening region by absorbing the error. be able to. Note that the door opening sensor 40b is
Although it is configured with a PBR (potentiometer balance register) built in the, it may be configured with another encoder. Further, the vehicle air conditioner 100 of the present embodiment
As shown in FIG. 2, as the control elements of the air mix door 33, the air conditioner amplifier unit 50 includes a vehicle interior air temperature estimating unit 53 for estimating the air temperature in the vehicle interior in consideration of the temperature influence element, and a temp control. Temperature deviation calculating means 54 for calculating a deviation S between the set temperature Tptc set by the lever 71 and the vehicle interior air temperature estimated by the vehicle interior air temperature estimating means 53, and the temperature deviation S calculated by the temperature deviation calculating means 54 Based on the air mix door 33
And a target door opening determining means 51 for determining which direction the moving direction is, and adding or subtracting a fixed opening to or from the previous target door opening to determine the target door opening. These are all the microcomputer CP
It is composed of U, ROM, RAM and other electronic components. When the cabin temperature Tptc is set by the occupant using the balance control lever 71, the cabin air temperature estimating means 53 estimates the cabin air temperature in consideration of the temperature influence factor. The temperature-influencing factors here are the inside air temperature,
Refers to factors that may affect the air temperature in the passenger compartment, such as the outside air temperature, the amount of solar radiation, and the suction temperature. Specifically, these are detected by the inside air sensor 63, the outside air sensor 64, the solar radiation sensor 65, and the suction temperature sensor 66. The determined inside air temperature Tinc, outside air temperature Tam, solar radiation Qsun, and suction temperature Tint are used. The temperature deviation calculating means 54 calculates the set temperature Tp
The deviation S between tc and the vehicle interior air temperature is obtained. This temperature deviation S means the degree of deviation of the vehicle interior air temperature with respect to the set temperature. For example, when the air mix door actuator 43 is to be operated, Set temperature Tptc,
Outside air temperature Tam, inside air temperature Tinc, suction temperature Tint
And a thermal balance equation using the solar radiation Qsun. The thermal equilibrium equation is given, for example, by the following equation, but is not particularly limited in the present invention.

S = (A + D) Tptc + (B · Tam−D ·
Tinc) + C · Qsun + E + αXm− (F · X +
G) (88−Tint) −Tint where A, B, C, D, E, F, and G are coefficients, Tptc
Is the set temperature, Tam is the outside air temperature, Tinc is the inside air temperature,
Qsun represents the amount of solar radiation, αXm represents a deviation correction value determined according to the blowing mode, X represents the door opening, and Tint represents the suction temperature. Based on the temperature deviation S, the target door opening determining means 51 determines which direction the air mixing door 33 operates, and adds or subtracts a certain opening to or from the previous target door opening. The target door opening is determined, and the target door opening is transmitted to the actuator 43. In particular, in the present embodiment, the target door opening setting region Rx in the target door opening determining means 51 is:
As shown in FIG. 1, both ends of the door are set wider than the actual opening region Rd of the door. In other words, the door actually rotates only in the region of Rd, but the target door opening data Xpbr output from the target door opening determining means 51 indicates that the region Rd exceeds the region Rd.
x is targeted. Therefore, for example, when the full shut (Xpbr = 0%) of the air mix door 33 is output, the air mix door 33 is mechanically heated by the heater core 32.
Stops when it turns to the fully closed position,
Since the actual opening degree of the air mix door 33 has not reached 0%, in the air mix door actuator 40,
The current is continuously supplied from the signal processing unit 40c to the motor 40a. This is fully open (Xpbr
= 100%). As shown in FIG. 6, the format of communication exchanged between the air conditioner amplifier unit 50 and the actuator is, for example, 16 bi.
In the data area t, an area F1 in which a code indicating the start of transmission is written, an area F2 in which an address of a door actuator to be transmitted is written, and an area in which an operation command (permission or inhibition) of a door actuator is written F
3. An area F4 in which the target stop position of the door actuator is written, an area F5 in which odd-numbered parity for information of F2 to F4 is written, and an area F6 in which a diagnostic door actuator return signal is written. Of these, the area where the return signal of the door actuator is written has a data length of, for example, only 1 bit, and
As shown in (2), a high-level signal output during operation of the door actuator and a low-level signal output during stoppage of the door actuator are written. In addition,
Although the activation and deactivation of the door actuator is identified by a high level and a low level, it is also possible to reverse this. In particular, the vehicle air conditioner 100 of the present embodiment
Is a detection area Rpb that exceeds the actual opening area Rd of the door.
r and the target door opening setting region Rx, in other words, FIG.
When the operation signal from the actuator 40 continues for a predetermined time t or more in the vicinity of the full shut and the full open shown in (1), the motor lock release unit 52 that outputs a stop signal to the signal processing unit 40c of the actuator 40 is In addition. Since the motor unlocking means 52 is incorporated in the microcomputer of the air conditioner amplifier unit 50 in the form of a CPU, a ROM, and a RAM, the stop signal output from the motor unlocking means 52 is directly processed by the signal processing of the actuator 40. It may be transmitted to the means 40c, or may be transmitted via the target door opening degree determining means 51 as shown in FIG. In this case, the area F3 in which the operation command of the communication format F shown in FIG. 6 is written is used. Next, the operation will be described. FIG. 4 is a flowchart showing the information processing procedure executed by the air conditioner amplifier unit 50 shown in FIG. 2, and FIG. 5 is a flowchart showing a subroutine of the motor lock release step (step 70) shown in FIG. Hereinafter, the control of the air mix door 33 will be described as an example. When the air conditioner switch is input, automatic control of the air mix door 33 is started. First, in step 10, information necessary for controlling the opening of the air mix door 33 is input from the various sensors 61 to 66 and the control panel 70. Around this time, step 20
Determines the coefficients A to G used in the thermal equilibrium equation. Strictly speaking, the coefficients F and G are determined in the next step 30. Next, at step 30, the temperature deviation S is obtained using the above-mentioned thermal equilibrium equation. In calculating the temperature deviation S, first, the combined temperature W is calculated from the outside air temperature Tam, the inside air temperature Tinc, and the coefficients B and D. W = B · Tam + D
-Calculated by Tinc. Next, the door opening X is obtained by calculation from the target door opening Xpbr obtained in the previous calculation process, and the deviation correction value αXm is determined in accordance with the selected blowing mode. Further, the coefficients F and G are determined by the door opening X and the blowing mode (vent, differential, bi-level 2 mode or any other mode).
Finally, the value obtained in this way is substituted into the above-mentioned thermal equilibrium equation, and the temperature deviation S between the set temperature and the room temperature is calculated. In step 40, the set temperature Tptc on the control panel 70 is set to a full cool range of less than 18.5 ° C., a full hot range of more than 31.5 ° C., or 18.5.
It is determined whether the temperature is in the temperature control range of not lower than 3 ° C. and not lower than 31.5 ° C. The boundary temperatures of 18.5 ° C. and 31.5 ° C. in this case are merely examples, and are not particularly limited. If the set temperature Tptc is in the full cool range of less than 18.5 ° C., the target door opening is set to Xpbr = 0%, and the air mix door 33 is rotated to the heater core fully closed position (step 64). ). On the other hand, when the set temperature Tptc is 3
In the case of a full hot range exceeding 1.5 ° C., the target door opening is set to Xpbr = 100%, and the air mix door 33 is rotated to the heater core fully open position (step 6).
5). In step 40, the set temperature Tptc
Is in the temperature control range of 18.5 ° C. or more and 31.5 ° C. or less, in the next step 50, it is determined whether or not the absolute value | S | Judge,
If the absolute value | S | of the temperature deviation is 2 or less, step 6
Proceeding to 1, the target door opening Xpbr is set to the same value as the previous target door opening, that is, Xpbr = Xpbr + 0%. On the other hand, if the temperature deviation S is less than -2 at step 60, the routine proceeds to step 62, where the target door opening X
pbr is reduced by 1% from the previous time, that is, Xpbr = Xpb
r-1%. On the other hand, in step 50, the temperature deviation S
Is greater than 2, the routine proceeds to step 63, where the target door opening Xpbr is increased by 1% from the previous time, that is, Xpb
Let r = Xpbr + 1%. If the motor 43a of the air mix door actuator 43 is locked during the repetition of such temperature control, a process for releasing the motor 43a is performed between the motor lock release means 52 and the actuator 43. That is, in the door lock release routine shown in FIG.
Is determined as to whether the response signal from is high level (during operation) or low level (during stop). At this time, when the return signal is at the low level, the actuator motor 43a has already stopped, and there is no need to release the motor lock.
Although the process is terminated as it is, if the return signal is at the high level, the process proceeds to step 73, and it is verified whether or not the high level signal continues for a predetermined time t or more. The predetermined time t is a time required for the door to reach the fully open or fully closed position from the vicinity of the opening and closing ends thereof, and is not particularly limited, but is, for example, about several seconds. After elapse of t seconds in step 73, the return signal is checked again in step 74, and if the signal is low, the process is terminated as it is not necessary to release the motor lock. If the high-level signal continues, that is, if the current continues to flow through the motor 43a despite the stop of the air mix door 33, the motor is in the locked state, and the process proceeds to step 75. Then, a stop signal of the actuator is output from the motor lock release means 52 to the signal processing means 43c of the air mix door actuator 43 via the target door opening degree determining means 51, and the process returns to step 71. Thereby, the actuator 40
Stops until the next operation signal is input, thereby preventing overheating of the motor 40a. Such a motor unlocking procedure is performed similarly for the actuators 41, 42, and 44 of doors other than the air mix door 33. In the present embodiment, the motor unlocking procedure does not use data exclusive for motor unlocking. 1 bit used
With this data amount, the unlocking process of the actuator motor can be performed automatically and quickly. The embodiments described above are described for facilitating the understanding of the present invention, and are not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention. For example, the control flow of the air mix door 33 can be controlled by a method other than the above-described embodiment, and is not directly related to the motor lock release of the present invention shown in FIGS.

As described above, according to the present invention, L
Even in an AN air conditioner for automobiles, the actuator motor can be unlocked automatically and quickly with a small amount of data without using data dedicated to motor lock prevention, and the durability of the motor is improved. be able to.

[Brief description of the drawings]

FIG. 1 is a block diagram (corresponding to a claim) showing an automotive air conditioner of the present invention.

FIG. 2 is a block diagram showing an embodiment of the automotive air conditioner of the present invention.

FIG. 3 is a system diagram of the vehicle air conditioner shown in FIG. 2;

FIG. 4 is a flowchart showing an information processing procedure executed by the air conditioner amplifier unit shown in FIG. 2;

FIG. 5 is a flowchart showing a subroutine of a motor lock release step shown in FIG. 5;

FIG. 6 is a diagram showing a communication format communicated between the air conditioner amplifier unit and the actuator shown in FIG. 2;

FIG. 7 is a waveform chart showing a return signal from the actuator shown in FIG. 6;

FIG. 8 is a block diagram for explaining a motor lock prevention mechanism in a conventional automotive air conditioner.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 100 ... Air conditioner for vehicles 10 ... Intake unit 16D ... Intake door 20 ... Cooler unit 30 ... Heater unit 34D ... Vent door 35D ... Defrost door 36D ... Foot door 38D ... Bypass door 40 ... Door actuator 40a ... Motor 40b ... Door opening sensor 40c ... Signal processing means 50 ... Air conditioner amplifier unit 51 ... Target door opening degree determining means 52 ... Motor lock release means 60 ... Sensors 70 ... Control panel 71 ... Door opening degree setting means 72 ... Display means

Claims (1)

[Claims] A target door opening determining means (5) for determining a target door opening (Xpbr) calculated and processed by a microcomputer based on each sensor and each switch input.
1); a door opening detecting means (40b) for detecting an actual opening (X) of the door; and a data of the target door opening determined by the target door opening determining means. An actuator (40) having signal processing means (40c) for operating the door (D) so that the actual door opening detected by the degree detecting means coincides with the target door opening. Automotive air conditioner (1) that outputs an operation signal and a stop signal of an actuator
00), the detection area (R) in the door opening detection means (40b).
pbr) and the target door opening setting region (Rx) in the target door opening determining means (51) are set wider at both ends thereof than the actual opening region (Rd) of the door. When the operation signal from the actuator continues for a predetermined time (t) or more in the detection area and the target door opening setting area which exceed the actual opening area,
An air conditioner for an automobile, further comprising a motor unlocking means (52) for outputting a stop signal to the actuator.