JPS6246370B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention provides a fault indication method for a vehicle air conditioner;
In particular, the present invention relates to a display method in which a failure is indicated by a display that displays the set temperature of a temperature setting device.

2. Description of the Related Art In recent years, vehicle air conditioners have become popular, which automatically control an air mixer door that adjusts the mixing ratio of warm air and cold air. This air conditioner for vehicles calculates and processes output signals from control elements such as a temperature setting device, inside air sensor, outside air sensor, etc., and adjusts the mixing ratio of warm air and cold air based on the calculation results. It has been proposed to include a control device for automatic control, and this control device is configured using a microcomputer device.

Conventionally, in this type of vehicle air conditioner, if the actuator motor locks up, the inside air sensor or outside air sensor is short-circuited, or an oven failure occurs, there is no failure determination means, so these control elements are disabled. This has the drawback that it takes a long time to determine whether or not there is a failure, which delays recovery work.

An object of the present invention is to eliminate the above-mentioned drawbacks by displaying a failure indication using a display device that displays the set temperature of a temperature setting device when a control element of a vehicle air conditioner fails. This will be explained in detail using .

FIG. 1 is a block diagram showing an embodiment of a fault indication method for a vehicle air conditioner according to the present invention.
In the figure, 1 is a control device for a vehicle air conditioner, which selectively controls a temperature setting signal T _D of a temperature setting device 2, an inside air temperature signal tr of an inside air sensor 3, and an outside air temperature signal ta of an outside air sensor 4. The multiplexer 6 outputs to the analog-to-digital converter 5, the above-mentioned signals T _D , tr, ta and the output signal _θ drive circuit 8
It is equipped with a central processing unit 9 that controls the following. The drive circuit 8 includes transistors 10, 10, which control the mode setting motor 7 based on the output signal.
10, thereby controlling the rotational position of the motor 7 and setting the blowing direction of the conditioned air to face mode, heater mode, ventilate mode, or defrost mode. Note that a load signal V _M is output from the load detection circuit 16 of the motor 7 to the central processing unit 9. The central processing unit 9
is supplied with an opening signal θ _x from an opening detector 15 , and based on this signal _θ
It also controls the display device 14 via the drive circuit 13. By controlling the opening degree of the air mixer door by the motor 12, the mixing ratio of warm air and cold air can be harmonized, and the temperature inside the vehicle, that is, the inside air temperature, can be adjusted to the setting set by the occupant based on the operation of the temperature setting device 2. temperature can be approached. The drive circuit 13 displays the set temperature on the display device 14 based on the set temperature signal T _D output from the temperature setting device 2 to the central processing unit 9. The display device 14 is composed of a fluorescent display, a liquid crystal display, etc., and in this embodiment is composed of a two-digit numerical display device. Therefore, when the passenger operates the temperature setting device 2 and sets the inside air temperature to, for example, 25°C, the number "25" is displayed on the display device 14.
This allows you to know the set temperature.

In the present invention, the central processing unit 9 has the following determination and control functions. The signal V _L1 corresponding to the lower limit of the normal operating range of the opening detector 15, the signal V _H1 corresponding to the upper limit thereof, and the opening signal θ _x of the opening detector 15 are such that V _L1 < θ _x < V _H The signal V _L2 corresponding to the lower limit of the normal operating range of the inside air sensor 3, the signal V _H2 corresponding to the upper limit, and the output signal tr of the inside air sensor 3 are determined to be V _L2 <
A function to determine whether tr<V _H2 is satisfied, a signal V corresponding to the lower limit of the normal operating range of the outside air sensor 4
A function to determine whether _L3 , a signal V _H3 corresponding to its upper limit, and an output signal ta of the outside air sensor 4 satisfy the relationship V _L3 < ta < V _H3 , and a signal V corresponding to the load of the motor 7. The load signal when _M and motor 7 are locked, that is, the lock signal V _LOCK , is V _M < V _L
A function to determine whether or not _OCK is satisfied, and a function to output the opening detector failure indication signal Re when the above V _L1 < θ _x < V _H1 is not satisfied, V _L2 < tr < V _H2
Internal air sensor failure indication signal Rr when not satisfied
A function to output an outside air sensor failure indication signal Ra when V _L3 < ta < V _H3 is not satisfied, a function to output an actuator/motor failure indication signal R _n when V _M <V _LOCK is not satisfied. Further, when each of the above relationships is satisfied, the set temperature of the temperature setting device 2 is displayed on the display device 14, and when not satisfied, the display device 14 is prevented from displaying the set temperature, and the display contents are changed, for example. It has a function of sending out a blinking signal R _V to the drive circuit 13.
Note that the failure display signal R _e causes the display device 14 to display a number representing the opening detector 15, and the failure display signals Rr, Ra, and R _n display numbers representing the internal air sensor 3, the external air sensor 4, and the motor 7, respectively. is displayed on the display device 14.

Next, the operation of the failure display method for a vehicle air conditioner according to the present invention will be explained using the flowchart shown in FIG. First, if the air mix door opening degree detector 15, inside air sensor 3, outside air sensor 4, and motor 7 are normal, the central processing unit 9 controls the drive circuit 13 and causes the display device 14 to display the current set temperature. . If the opening degree detector 15, inside air sensor 3, outside air sensor 4, and motor 7 are short-circuited, open, or locked, and the output signal is abnormally small or large, an air mix door failure display Re is output, and based on this, The drive circuit 13 displays a number corresponding to the opening detector 15, for example "01", or displays the internal air sensor failure display signal Rr.
is output, and based on this, the drive circuit 13 displays a number corresponding to the inside air sensor 3, for example "02", or an outside air sensor failure display signal Ra is output, and based on this, the drive circuit 13 displays the outside air sensor 4, For example, "03" is displayed, or actuator/motor failure display R _n is output, and based on this, the drive circuit 13 selects the number corresponding to motor 7,
For example, display "04". On the other hand, the above signal Re,
Failure is determined by Rr, Ra, and Rm, so
The display operation of the set temperature is stopped, and the display contents of the display device 14 are driven to blink by the signal _Rv .
That is, by blinking the display content on the display device 14, it can be detected that the control element of the vehicle air conditioner has failed. Furthermore, it is possible to detect which element has failed based on the displayed content. For example, if "02" is displayed, it can be determined that the internal air sensor 3 has failed. In addition, by this signal R _v , either one of the lower digits or the upper digits of the display device 14 is turned off, or an incomprehensible character, for example, "3" is displayed in either the lower digits or the upper digits. ，
"H" etc. is displayed, and the other digit shows the signal Re, Rr, etc.
A number may be displayed to represent a failed element based on Ra and R _n .

In addition, in the present invention, a method for determining failure of the opening degree detector 15, inside air sensor, outside air sensor 4, and motor 7 has been described, but failure of other elements such as the evaporator temperature sensor, duct sensor, solar radiation sensor, etc. The present invention can be similarly applied to the case of determining .

As explained above, according to the present invention, it is determined whether the magnitude of the output signal of a control element such as a temperature sensor or a motor actuator for controlling a vehicle air conditioner is within a set range. However, when it is determined that the control element has failed, it is displayed on the set temperature display device, so it can be immediately determined that the control element has failed, and the failure can be repaired quickly. , the burden on failure recovery workers can be reduced. Furthermore, since the failure display is displayed on the display device that is normally visible to the occupants, failures can be detected early and a chain reaction of failures can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the failure display method for a vehicle air conditioner according to the present invention, and FIG. 2 is a flowchart for explaining the operation of the failure method for a vehicle air conditioner according to the present invention. be. DESCRIPTION OF SYMBOLS 1... Control device, 2... Temperature setting device, 3... Inside air sensor, 4... Outside air sensor, 5... Analog-to-digital converter, 7, 12... Motor, 9... Central processing unit, 14... ...display device, 15...opening degree detector.

Claims (1)

[Claims] 1. Determine whether the magnitude of an output signal from a control element for controlling a vehicle air conditioner equipped with at least an air mixer door that adjusts the mixing ratio of warm air and cold air is within a set range. ,
A failure display method for a vehicle air conditioner, characterized in that a failure of the control element is displayed on a display device for displaying a set temperature of a temperature setting device based on the determination result.