KR20090116044A - Method of controlling fault diagnosis of automatic temperature control system for a vehicle - Google Patents

Abstract

PURPOSE: An impediment diagnosis mode control method of an automatic temperature controller for vehicles is provided to control the input of a control switch. CONSTITUTION: A first control switch of an automatic temperature controller for vehicles is checked in a first step(S510). A second control switch of the automatic temperature controller for the vehicle is check in a second step(S530). The first and second control switches are checked in a third step(S540). The automatic temperature controller for the vehicle is diagnosed as an impediment, if the first and second control switches are checked as those are not pressed in a third step(S570). The input of another control switch is blocked in a fifth step(S580).

Description

Fault diagnosis mode control method of automotive thermostat {METHOD OF CONTROLLING FAULT DIAGNOSIS OF AUTOMATIC TEMPERATURE CONTROL SYSTEM FOR A VEHICLE}

The present invention relates to a thermostat for an automobile, and more particularly, to a method for controlling a failure diagnosis mode of a thermostat for a vehicle by adjusting inputs of control switches of a thermostat of a vehicle connected through a serial communication network. .

In the thermostat for automobiles, interference may occur due to the input of the switch during self-diagnosis and diagnosis. For example, it may not be displayed on the screen when the switch for changing the wind direction is pressed during diagnosis, but it is possible for the motor actuator for changing the wind direction in the air conditioning module to operate.

In general, the thermostat is equipped with a sensor that can detect a variety of temperatures, insolation, cooling water, etc. according to the temperature set by the user, and automatically adjusts the temperature inside the vehicle to match the temperature desired by the user with the sensor detected value It is made to be adjusted.

Figure 1 shows a configuration of a general automotive thermostat. Automotive thermostat 190 has a variety of input sensors such as the air sensor 30, the outside air sensor 32, the solar radiation measuring sensor 34, the cooling sensor 36, the temperature actuator 80, the mode actuator An air conditioner module such as 70, an intake actuator 60, a blower 50, a battery 10, an ignition switch 20, and a serial data communication network 105 are connected.

Conventionally, an auto thermostat for a vehicle in a vehicle that does not support a serial data communication network supports a function of detecting whether an air conditioning module and an input sensor are normally operated for effective control. However, the serial data communication network 105 is applied to a vehicle. If there is no separate diagnostic equipment, there is no support for detecting when a failure occurs.

In addition, although serial data communication networks have many advantages as they are applied to vehicles, communication problems still remain.

This phenomenon is more likely to cause errors when combined with other routines. The thermostat for a vehicle of the prior art relates to a failure diagnosis method for determining the failure without using a dedicated diagnostic equipment.

However, there was no description of the function to limit the input of another control switch during the troubleshooting.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems of the prior art, and the fault diagnosis mode control method for a thermostat for a vehicle which limits the input of another control switch while in the fault diagnosis mode of a vehicular thermostat. The purpose is to provide.

The first feature of the failure diagnosis mode control method of the thermostat for a vehicle according to the present invention for solving the above problems is the first step of determining whether the first control switch of the thermostat for a vehicle is depressed, A second step of determining whether the second control switch of the thermostat is pressed, a third step of determining whether both the first control switch and the second control switch are pressed, the first step and the second In step 3, when the first control switch and the second control switch are not pressed, and in the third step, when both the first control switch and the second control switch are not pressed, the apparatus enters the failure diagnosis mode of the thermostat. A fourth step and a fifth step of blocking input of another control switch.

The first step includes storing the pressed state and the released state of the first control switch in advance. The second step includes storing the pressed state and the released state of the second control switch in advance.

The first control switch and the second control switch is a switch for a thermostat.

The second feature of the failure diagnosis mode control method of the thermostat for a vehicle according to the present invention is the step of determining whether the first control switch of the thermostat for a vehicle is pressed, the second control of the thermostat for a vehicle Determining whether the switch is depressed, cutting off the input of another control switch, and proceeding to the failure diagnosis mode of the thermostat when neither the first control switch nor the second control switch is pressed. Include.

The fault diagnosis control method of the thermostat for a vehicle according to the present invention configured as described above is limited to the input of another control switch during the determination of the fault of the thermostat to prevent the occurrence of an abnormal state during the diagnosis or the completion of the fault diagnosis. It is effective to prevent.

Hereinafter, with reference to the accompanying drawings will be described specific details and embodiments of the present invention.

2 is a schematic diagram of an automotive thermostat connected to a serial communication network. The thermostat 210 receives data through various sensors for measuring the temperature inside and outside the vehicle, and accordingly outputs a control signal to the air conditioning module to adjust the temperature to the set temperature. The thermostat 210 is controlled by serial data communication.

The change in the various states of the vehicle, which is changed according to the operation of the air conditioning module, is output to the display apparatus 220, and the thermostat 210 and the display apparatus 220 are connected to a serial data communication network to mutual data. Send and receive Thermostats for automobiles with serial data communication networks tend to integrate display units that indicate the status of air conditioning modules into separate display devices. It works in conjunction.

In addition, the gateway 230 for controlling communication between the devices is also connected to the serial data communication network.

3 is a schematic diagram of a thermostat for a vehicle configured with a serial data communication network. Referring to FIG. 3, the display device 320 is included in the thermostat 310. The thermostat 310 and the gateway 230 are controlled by serial data communication.

4 is a flowchart for determining whether a key is input. In FIG. 4, key 1 is in an OFF state. The key input determination flowchart of FIG. 4 first reads the pressed key 1 state and released key 1 state (S410). That is, key 1 is pressed, read the pressed key 1 state, key 1 is released, and read the released key 1 state. Thereafter, it is determined whether a predetermined time has elapsed (S420). In such a case, it is determined that the key 1 is abnormal and the loop returns to S410 (S440). If the timer has not expired, the current key state is stored (S430).

Hereinafter, the present invention will be described with reference to FIG. 5. In FIG. 5, key 1 is AUTO and key 2 is OFF.

Referring to FIG. 5, first, key 1 is pressed (S510). Thereafter, it is determined whether to maintain the current state (S515). If the current state is not maintained, the process moves to S600 to perform a specific control subroutine. If the current state is maintained, the pressed key 1 state is read (S520). Thereafter, key 2 is pressed (S530). Thereafter, it is determined whether an input change of the key 2 has occurred three or more times (S535). If the input change of the key 2 has not occurred more than three times in S535, the process returns to S530.

Thereafter, the number of input changes of the pressed key 2 state is read (S540). The key 1 and key 2 states are released (S550). Thereafter, it is determined whether the key state is released (S555). When the key state is not released, the flow returns to S540. When the key state is released, the released key 1 state and released key 2 state are read (S560). Thereafter, the system enters the failure diagnosis mode (S570). Thereafter, another key input is blocked (S580).

In one embodiment, there is a step to take proactive steps before performing the troubleshooting in the thermostat. At this stage, if the airflow is in operation, set it to stop. The set temperature is then changed to a temperature other than the initial state. In the present invention, the initial state is displayed as 25.0 ° C and the change temperature is set to 26.0 ° C. Then, when the control switch of the thermostat is pressed in combination, it judges this and if it is a normally selected input, cuts off the input of other switches and enters the trouble diagnosis mode to check the operation status of various sensors and actuators Temperature or number of clocks).

In more detail, when the first control switch is selected, a case may be inevitably pressed due to the use condition of the vehicle. In other words, the control switch does not work and therefore cannot accept the control switch input. In this case, the diagnostic mode cannot be entered. If it is normally input, it is determined whether the change of the input of the second control switch has occurred more than three times by reading whether the current state is kept pressed. If both control switches are not pressed, it means that the normal diagnostic mode has been entered. Therefore, the microcomputer enters the diagnostic mode. In another embodiment, it is also possible to first set to limit the input of the other control switch and then enter the diagnostic mode.

When the touch screen method is applied, it is not easy to combine the two key icons corresponding to one of the diagnostic modes (Self-It-Test or Diag.). When the user selects the key icon, the screen corresponding to the touch screen is configured to input information corresponding to the key 1 and the key 2 to the thermostat. This is a configuration possible with the modification of FIG.

In FIG. 5, analysis and internal processing routines according to data input of serial data communication are omitted. Control switch inputs that are not related to air conditioning module control are not reflected.

As described above, the failure diagnosis control method for a thermostat for an automobile according to the present invention has been described with reference to the illustrated drawings, but the present invention is not limited by the embodiments and drawings disclosed herein, and the technical concept is protected. It can be applied within the range.

1 is a schematic view of a general thermostat for a vehicle,

2 is a schematic diagram of a thermostat for a vehicle configured with a serial data communication network,

3 is a schematic diagram of another type of thermostat for a vehicle configured with a serial data communication network;

4 is a flowchart for determining whether a key is input;

5 is a flowchart for determining whether a key is continuously input according to the present invention.

       <Explanation of symbols on main parts of the drawings>

105: serial data communication 130: bet sensor

180: temperature actuator 190: thermostat

210: thermostat 220: display device

230: gateway 310: thermostat

320: display device 330: gateway

Claims (5)

A first step of determining whether the first control switch of the automotive thermostat is pressed; A second step of determining whether the second control switch of the automotive thermostat is pressed; A third step of determining whether both the first control switch and the second control switch are pressed; Automatic temperature control when the first control switch and the second control switch are not pressed in the first step and the second step, and neither the first control switch nor the second control switch is pressed in the third step. A fourth step of entering a failure diagnosis mode of the device; And A failure diagnosis mode control method for a thermostat for a vehicle comprising a fifth step of blocking input of another control switch. The method according to claim 1, And the first step includes storing the pressed state and the released state of the first control switch in advance. The method according to claim 1, The second step includes the step of storing the state in which the second control switch is pressed and released in advance failure control mode control method for a vehicle thermostat. The method according to claim 1, The first control switch is a failure diagnosis mode control method of the automotive thermostat, characterized in that the switch for the thermostat. Determining whether the first control switch of the automotive thermostat is pressed; Determining whether the second control switch of the automotive thermostat is pressed; Blocking input of another control switch; And And when the first control switch and the second control switch are both depressed, proceeding to a failure diagnosis mode of the thermostat.

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