JP3540898B2 - Bypass door control device for vehicle air conditioner system - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention belongs to the technical field of a bypass door control device for a vehicle air conditioner system in which an air conditioner amplifier unit and a bypass door actuator are connected to a LAN (local area network) to control opening and closing of the bypass door by data communication.
[0002]
[Prior art]
Conventionally, the bypass door control of a vehicle air conditioner system in which an air conditioner amplifier unit and a bypass door actuator are connected to a LAN to control opening and closing of the bypass door by data communication is performed in the air conditioner amplifier unit when the mixed door opening degree is a full cold in a vent mode. Alternatively, in the case of the bi-level mode in which the temperature is controlled by head and foot heat, the bypass door is fully opened, and in other cases, the door opening data for completely closing the bypass door is transmitted, and the opening data is received by the bypass door actuator. In this case, the bypass door is fully opened or fully closed according to the received door opening data.
[0003]
[Problems to be solved by the invention]
However, in the above-mentioned conventional bypass door control device for a vehicle air conditioner system, the fail-safe mode associated with the use of the LAN is not set, so that when a communication error occurs, the bypass door stops in a state before the communication error.
[0004]
For this reason, if the bypass door is stopped in the fully opened state, the temperature adjustment becomes cold overall, and there is a problem that a driver or an occupant is uncomfortable.
[0005]
That is, in the vent mode, when the mix door opening is other than full cold, or in the differential mode, foot mode, or defogger mode other than the bi-level mode, the bypass door is fully closed, and the set temperature, the outside air temperature, the inside air temperature, The mix door opening is controlled according to the suction temperature and the like. However, if the bypass door is left fully open when it is normally fully closed, the cool air from the evaporator will be led to each outlet through the bypass passage, and the overall temperature adjustment will be cold. turn into.
[0006]
An object of the present invention is to provide a bypass door control device for a vehicle air conditioner system in which an air conditioner amplifier unit and a bypass door actuator are connected to a LAN to control opening and closing of the bypass door by data communication, while the bypass door remains open. An object of the present invention is to ensure temperature adjustment so that the temperature does not become cold even when a communication error occurs.
[0007]
[Means for Solving the Problems]
(Solution 1)
Means for solving the above-mentioned problem 1 (claim 1), as shown in the claim correspondence diagram of FIG. 1, bypasses a ventilation passage d provided with a heater core c disposed from an evaporator a via a mix door b, a bypass door g provided in a bypass passage f that guides cool air from a to a vent outlet e;
In the vent mode, when the mixed door opening is full cold, or in the bi-level mode in which temperature control is performed with cold head heat, the bypass opening g is set to the open side, and in other cases, the bypass door g is set to the closed side. An air conditioner amplifier unit h for transmitting data;
A bypass door actuator i that receives door opening data from the air conditioner amplifier unit h and controls opening and closing of the bypass door g according to the received door opening data;
In a bypass door control device of a vehicle air conditioner system having a
Communication error checking means j for checking an error in data communication between the air conditioner amplifier unit h and the bypass door actuator i;
A fail-safe means k for completely closing the bypass door g when the communication error check means j detects that a communication error has occurred, irrespective of the door opening data which is communication information.
[0008]
To explain the operation, when the data communication is normal, when the mixed door opening degree is full cold in the vent mode, or in the bi-level mode in which the temperature control is head and cold heat, the door opening with the bypass door g on the open side is opened. Is transmitted from the air conditioner amplifier unit h to the bypass door actuator i, and in other cases, door opening data for closing the bypass door g is transmitted from the air conditioner amplifier unit h to the bypass door actuator i, and the bypass door actuator i , The bypass door g is opened and closed according to the received door opening data.
[0009]
For example, in the bi-level mode, the mix door b is set to an intermediate opening in accordance with the set temperature, and hot air is blown out from the foot outlet, while the bypass door g is set to the open side. Then, the cool air from the evaporator a is guided to the vent outlet e through the bypass passage f, and a slightly cooler wind is blown out from the vent outlet e, so that the temperature is adjusted to the head cold foot heat.
[0010]
On the other hand, when the vent mode is selected when a communication error has occurred while the bypass door g is in the open state, it is expected that warm air corresponding to the set temperature is blown out from the vent outlet e. Nevertheless, since the bypass door g is on the open side, cool air is mixed and the temperature adjustment becomes cold.
[0011]
However, if a communication error occurs, the communication error checking means j checks for an error in data communication, and if a communication error is detected, the fail-safe means k sets the bypass door g regardless of the door opening data. By being fully closed, temperature control does not become cold.
[0012]
(Solution 2)
According to a second aspect of the present invention, in a bypass door control device for a vehicle air conditioner system according to the first aspect,
The communication error checking means j additionally sets a parity bit to the data so that the number of 1s in the entire data is odd (or even), counts the number of appearances of the data, and turns it into an even (or odd) number. Means for detecting a data communication error when the error occurs.
[0013]
(Solution 3)
According to a third aspect of the present invention, in a bypass door control device for a vehicle air conditioner system according to the first or second aspect,
The communication error check means j and the fail-safe means k are characterized by means of a communication error check program and a fail-safe program in a data processing circuit built in the bypass door actuator i.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
(Embodiment 1)
Embodiment 1 is a bypass door control device of a vehicle air conditioner system corresponding to Solution 1 to Solution 3.
[0015]
First, the configuration will be described.
[0016]
FIG. 2 is a diagram of a vehicle air conditioner system to which the bypass door control device of the first embodiment is applied, and FIG. 3 is a diagram illustrating a bypass door actuator of the bypass door control device of the first embodiment.
[0017]
As the mechanical system of the air conditioner system, as shown in the upper part of FIG. 2, an intake unit case 1, an outside air side intake port 2, an indoor side intake port 3, a blower fan 4, a blower fan motor 5, an intake door 6, a cooling unit case 7, , An evaporator 8, a heater unit case 9, a vent outlet 10, a differential outlet 11, a foot outlet 12, a heater core 13, a bypass door 14, a mix door 15, a vent door 16, a differential door 17, and a foot door 18.
[0018]
The bypass door 14 is provided in a bypass passage 19 b that bypasses the air passage 19 a provided with the heater core 13 disposed from the evaporator 7 via the mix door 15 and guides the cool air from the evaporator 7 to the vent outlet 10. I have.
[0019]
As shown from the middle to the lower part of FIG. 2, the control system of the air conditioner system includes a fan control circuit 20, an intake door actuator 21, a bypass door (bilevel door) actuator 22, a mix door actuator 23, a mode door actuator 24, an air conditioner amplifier. A unit 25, a water temperature sensor 26, a refrigerant temperature sensor 27, an inside air sensor 28, an outside air sensor 29, a solar radiation sensor 30, a suction temperature sensor 31, and a display operation unit 32 are provided.
[0020]
The fan control circuit 20 controls the voltage applied to the blower fan motor 5 steplessly according to a command from the air conditioner amplifier unit 25.
[0021]
When the air opening of the intake door 6 (inside air, semi-outside air, outside air) is determined by the air conditioning amplifier unit 25, the intake door actuator 21 moves the intake door 6 to the determined door opening.
[0022]
The bypass door actuator 22 fully opens the door opening data D from the air conditioner amplifier unit 25 when the opening of the mix door 15 is full cold in the vent mode, or in the bi-level mode in which the temperature is controlled by head and foot heat. The bypass door 14 is opened by the data DO, and in other cases, the bypass door 14 is closed by the fully closed data DS of the door opening data D from the air conditioner amplifier unit 25.
[0023]
As shown in FIG. 3, the bypass door actuator 22 receives a motor 22a that opens and closes the bypass door 14 via a link mechanism and door opening data D, and performs data processing according to a communication error check program and a fail-safe program. And a data processing circuit 22b for issuing a drive command for the motor 22a.
[0024]
When the virtual door opening XPBR is determined by the motor air conditioner amplifier unit 25, the mixed door actuator 23 receives the data of the virtual door opening XPBR and obtains a door opening that matches the virtual door opening XPBR. The mix door 15 is operated as follows.
[0025]
When the target mode door position is determined by the air conditioner amplifier unit 25, the mode door actuator 24 opens and closes the mode door (general term for the vent door 16, the differential door 17, and the foot door 18).
[0026]
The air conditioner amplifier unit 25 processes input signals from switches and sensors according to program software by a built-in microcomputer, and blower fan motor 5, door actuators 21, 22, 23, 24, and not shown. Comprehensively controls compressors and the like.
[0027]
The water temperature sensor 26 converts the engine cooling water temperature into a resistance value and inputs the resistance value to the air conditioner amplifier unit 25.
[0028]
The refrigerant temperature sensor 27 is attached to the inlet side of the evaporator 8, converts the temperature of the refrigerant into a resistance value and inputs the resistance value to the air conditioner amplifier unit 25.
[0029]
The inside air sensor 28 senses the air temperature inside the vehicle compartment, that is, the inside air temperature TINC, converts it to a resistance value, and inputs it to the air conditioner amplifier unit 25.
[0030]
The outside air sensor 29 detects the outside air temperature Tam, converts it to a resistance value, and inputs the resistance value to the air conditioner amplifier unit 25.
[0031]
The solar radiation sensor 30 detects the amount of solar radiation QSUN entering from the windshield with a photodiode and inputs the detected value to the air conditioner amplifier unit 25 as a current value.
[0032]
The suction temperature sensor 31 is attached to the cooling unit, detects the suction temperature TINT after passing through the evaporator 8, converts the temperature into a resistance value, and inputs the resistance value to the air conditioner amplifier unit 25.
[0033]
The display operation unit 32 is mounted on a control panel of an automobile, and includes a display unit for displaying a mode, a fan speed, a temperature, and the like, and an operation unit provided with switches. The operation unit is provided with a mode switch for switching modes and a temperature adjustment dial 32a for freely selecting a set temperature TPTC within a range of 18 ° C to 32 ° C. The display operation unit 32 is provided with a communication interface 32b, and data is transmitted and received to and from the air conditioner amplifier unit 25 by a data transmission line 33 and reception lines 34 and 35.
[0034]
Next, the operation will be described.
[0035]
[Transmission operation of door opening data of bypass door]
FIG. 4 is a flowchart showing the flow of the operation of transmitting the door opening data of the bypass door 14 performed by the air conditioner amplifier unit 25, and each step will be described below.
[0036]
In step 41, information necessary for the bypass door opening / closing control (mode door position detection switch signal, virtual door opening XPBR, etc.) is input.
[0037]
In step 42, the mode selected based on a switch signal from a mode door position detection switch (not shown) provided in the mode door actuator 24 is a bi-level mode B / L, a vent mode VENT, or another differential mode. DEF, foot mode FOOT, and differential foot mode D / F are determined.
[0038]
In step 43, when it is determined in step 42 that the bi-level mode B / L has been selected, the full-open data DO is transmitted to the bypass door actuator 22 as the door opening data D. Note that a parity bit is additionally set in the fully open data DO so that the number of 1s in the entire data is odd (or even).
[0039]
In step 44, when it is determined in step 42 that any one of the differential mode DEF, the foot mode FOOT, and the differential foot mode D / F is selected, the bypass door actuator 22 receives the fully closed data as the door opening data D. DS is transmitted. A parity bit is additionally set in the fully closed data DS so that the number of 1s in the entire data becomes an odd number (or an even number).
[0040]
In step 45, when it is determined in step 42 that the vent mode VENT is selected, it is determined whether or not the virtual door opening XPBR, which is internal data obtained by the mixed door opening control, is XPBR = 0% indicating full cold. Is determined. If it is determined in step 45 that XPBR = 0%, the process proceeds to step 43, where the fully open data DO is transmitted. If it is determined that XPBR = 1 to 100%, the process proceeds to step 44, where the fully closed data DO is transmitted. DS is transmitted.
[0041]
[Bypass door drive control operation]
FIG. 5A is a flowchart showing the flow of the bypass door drive control operation performed in the data processing circuit 22b of the bypass door actuator 22, and each step will be described below.
[0042]
In step 51, a communication error is checked in accordance with the flowchart shown in FIG.
[0043]
In step 52, it is determined whether a communication error has occurred.
[0044]
In step 53, if a communication error is determined in step 52, the bypass door actuator 22 outputs a motor drive command to fully close the bypass door 14.
[0045]
Steps 52 and 53 correspond to fail-safe means k.
[0046]
In step 54, when it is determined that there is no communication error in step 52, the bypass door actuator 22 outputs a motor drive command for setting the bypass door 14 in a state corresponding to the door opening data D.
[0047]
FIG. 5B is a flowchart (corresponding to communication error check means j) showing a flow of a communication error check processing operation performed in the data processing circuit 22b of the bypass door actuator 22, and each step will be described below.
[0048]
In step 51a, the number of appearances of 1 in the door opening degree data D in which a parity bit is additionally set so that the number of 1s in the entire data is an odd number (or an even number) is counted, and whether the number of occurrences is an even number (or an odd number) is determined. Is determined.
[0049]
In step 51b, it is determined whether or not the parity error state in which the number of appearances of 1 in the door opening data D received in the check in step 51a is different from the setting continues for 3 seconds or more.
[0050]
In step 51c, when it is determined in step 51b that the duration of the parity error is 3 seconds or more, it is set as a communication error.
[0051]
In step 51d, when the number of appearances of 1 in the door opening data D received in the check in step 51a is the same as the setting, the communication error is cleared.
[0052]
[Open / close control of bypass door]
When the data communication between the air conditioner amplifier unit 25 and the bypass door actuator 22 is normal, the door opening data D determined according to the flowchart shown in FIG. In the bypass door actuator 22, the flow proceeds from step 51 to step 52 to step 54 in the flowchart shown in FIG. 5A, and the opening and closing of the bypass door 14 is controlled according to the received door opening data D.
[0053]
In other words, when the mixed door opening is full cold in the vent mode, or in the bi-level mode in which the temperature control is cold head heat, the bypass door 14 is fully opened, and when the mixed door opening is other than full cold in the vent mode. In the case of the differential mode, the foot mode, and the defogger mode, the bypass door 14 is fully closed.
[0054]
Therefore, when the mix door opening is full cold in the vent mode, the passage cross-sectional area of the bypass passage 19b is added to the passage cross-sectional area of the blower passage 19a as the passage cross-sectional area of the cool air that has passed through the evaporator 8, and the passage cross-sectional area is increased. When it is desired to rapidly lower the temperature of the vehicle interior that has become high in summer or the like, the cooling efficiency can be increased by fully opening the bypass door 14.
[0055]
Further, in the bi-level mode, the mix door 15 is set to the intermediate opening degree according to the set temperature, and while the hot air is blown out from the foot outlet 12, the bypass door 14 is fully opened. The cool air from the evaporator 8 is guided to the vent outlet 10 through the bypass passage 19b, and a slightly cooler wind is blown out from the vent outlet 10, so that the temperature is controlled to be head and foot heat.
[0056]
At times other than the above, the bypass doors 14 are fully closed, resulting in a state similar to that of a system without the bypass passage 19b, and the opening and closing of each mode door 10, 11, 12 is controlled according to the selected mode. At the same time, the opening of the mix door 15 is controlled according to the set temperature.
[0057]
[Fail-safe operation at communication error]
When the vent mode is selected when a communication error occurs while the bypass door 14 is kept fully open, it is expected that hot air corresponding to the set temperature is blown out from the vent outlet 10. Since the bypass door 14 is fully opened, the cool air sent through the bypass passage 19b is mixed, and the temperature adjustment becomes cold.
[0058]
However, when a communication error occurs, the flow proceeds from step 51a to step 51b to step 51c in the flowchart of FIG. 4B, and a communication error is set in step 51c. Therefore, in the flowchart of FIG. 5A, the flow proceeds from step 51 to step 52 to step 53. In step 53, a motor drive command for fully closing the bypass door 14 is output.
[0059]
Therefore, even if a communication error occurs while the bypass door 14 is kept fully open, the fail-safe operation of completely closing the bypass door 14 is performed, so that the temperature control does not become cold even when the vent mode is selected. It does not cause discomfort to the driver or the occupant.
[0060]
Next, effects will be described.
[0061]
(1) A communication error check is performed to check for an error in data communication between the air conditioner amplifier unit 25 and the bypass door actuator 22. When a communication error is detected, the door opening degree data D as communication information is added. Regardless, since the apparatus performs a fail-safe operation of fully closing the bypass door 14, it is possible to secure temperature adjustment that does not become cold even if a communication error occurs while the bypass door 14 is fully opened.
[0062]
(2) In the communication error check, a parity bit is additionally set to the door opening data D so that the number of 1s in the entire data is odd (or even), and the number of appearances of 1s in the door opening data D is counted. Is an even number (or an odd number), the error is detected by a parity error check to detect a data communication error. Therefore, the air conditioner amplifier unit 25 only needs to change the program by adding a parity bit, and does not increase the cost. .
[0063]
(3) Since the communication error check means and the fail-safe means are based on the communication error check program and the fail-safe program in the data processing circuit 22b built in the bypass door actuator 22, the data processing circuit 22b on the bypass door actuator 22 side. Program change, and there is no significant cost increase for performance improvement.
[0064]
(Other embodiments)
In the first embodiment, an example in which a parity error check method is employed as a communication error check method has been described. However, an error check method other than the parity error check method may be employed, or another parity error check method may be employed. A method to which an error check method is added may be adopted.
[0065]
In the first embodiment, an example has been described in which the communication error check means and the fail-safe means are implemented by means of a communication error check program and a fail-safe program in the data processing circuit 22b built in the bypass door actuator 22. A means for adding a communication error check program and a fail-safe program to the unit 25 may be used.
[0066]
【The invention's effect】
According to a first aspect of the present invention, there is provided a bypass door control device for a vehicle air conditioner system in which an air conditioner amplifier unit and a bypass door actuator are connected to a LAN to control opening and closing of the bypass door by data communication. Communication error check means for checking an error in data communication between the first and second communication means, and when a communication error is detected by the communication error check means, the bypass door is fully closed regardless of the door opening data which is communication information. Since the fail-safe means is provided, it is possible to obtain an effect that it is possible to secure temperature adjustment so that the temperature does not become cold even if a communication error occurs while the bypass door is open.
[0067]
According to a second aspect of the present invention, in the bypass door control device for a vehicle air conditioner system according to the first aspect, the communication error check unit is configured to control the data so that the number of 1s in the entire data is odd (or even). In addition to the above-mentioned effects, in addition to the above-described effect, the air conditioner is provided with a parity bit that sets an additional parity bit and counts the number of occurrences of 1 in the data, and detects a data communication error when it becomes an even (or odd) number. On the amplifier unit side, it is sufficient to change the program only by adding a parity bit, and it is possible to suppress an increase in device cost.
[0068]
According to a third aspect of the present invention, in the bypass door control device for a vehicle air conditioner system according to the first or second aspect, the communication error check means and the fail-safe means are built in the bypass door actuator. Since the communication error check program and the fail-safe program in the circuit are used, in addition to the above-mentioned effects, it is sufficient to change the program of the data processing circuit on the bypass door actuator side.
[Brief description of the drawings]
FIG. 1 is a diagram corresponding to a claim showing a bypass door control device of a vehicle air conditioner system of the present invention.
FIG. 2 is a diagram of a vehicle air conditioner system to which the bypass door control device of the first embodiment is applied.
FIG. 3 is a diagram showing a bypass door actuator of the bypass door control device according to the first embodiment.
FIG. 4 is a flowchart showing a flow of a door opening data transmission processing operation of a bypass door performed by the air conditioner amplifier unit of the apparatus of the first embodiment.
FIG. 5A is a flowchart showing a flow of a bypass door drive control operation performed in a data processing circuit of the bypass door actuator, and FIG. 5B is a flowchart showing a flow of the bypass door drive control operation performed in the data processing circuit of the bypass door actuator. 9 is a flowchart showing a flow of a communication error check process operation to be performed.
[Explanation of symbols]
a evaporator b mixed door c heater core d air passage e vent outlet f bypass passage g bypass door h air conamp unit i bypass door actuator j communication error checking means k fail safe means

Claims (3)

A bypass door provided in a bypass passage that bypasses an air passage provided with a heater core disposed from the evaporator via a mix door and guides cool air from the evaporator to a vent outlet;
In the vent mode, when the mixed door opening is full cold, or in the bi-level mode in which temperature control is performed with cold head heat, the door opening data that sets the bypass door to the open side and otherwise sets the bypass door to the closed side Air conditioner amplifier unit to send,
A bypass door actuator that receives door opening data from the air conditioner amplifier unit and controls opening and closing of the bypass door according to the received door opening data.
In a bypass door control device of a vehicle air conditioner system having a
Communication error checking means for checking data communication errors between the air conditioner amplifier unit and the bypass door actuator;
Fail-safe means for completely closing a bypass door regardless of door opening data which is communication information when a communication error is detected by the communication error checking means. Bypass door control device. The bypass door control device for a vehicle air conditioner system according to claim 1,
The communication error check means additionally sets a parity bit to the data so that the number of 1s in the entire data is odd (or even), and the number of appearances of the data is counted, and the number becomes 1 (even). A bypass door control device for an air conditioner system for a vehicle, wherein a means is provided by a parity error check for detecting an error in data communication at times. The bypass door control device for a vehicle air conditioner system according to claim 1 or 2,
The bypass door control device for a vehicle air conditioner system, wherein the communication error check unit and the fail safe unit are units based on a communication error check program and a fail safe program in a data processing circuit built in the bypass door actuator.

Images