JP2736466B2 - Operation device in case of operation switch failure - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operating device in the event of an operating switch failure in the case of two forward / reverse switches whose outputs continuously increase or decrease in direction when pressed continuously. It is.

2. Description of the Related Art Conventionally, in an air-conditioning control device for a vehicle having a temperature setting device for digitally displaying a set temperature, an up-down switch (a switch that continuously increases or decreases the output when the switch is continuously pressed) of a control panel is used. Two forward and reverse switches)
Is operated to change the set temperature.

Generally, this up / down switch is designed to automatically change the set temperature by 0.5 ° C in steps of up to 32 ° C in the up direction or up to 18 ° C in the down direction when the switch is pressed continuously. Have been.

(Problems to be Solved by the Invention) However, in the above-mentioned conventional up-down switch, for example, when the down switch is pressed but does not return, the set temperature drops to the minimum set value (18 ° C.) and the state is fixed. However, if the set temperature cannot be increased by pressing the up switch, or if the up switch is stuck at the maximum set value (32 ° C) and the down switch cannot be operated, a failure may occur. there were.

For this reason, if a failure occurs in which the up or down switch is stuck, especially in the winter season, it is not possible to open the window to warm the outside air, and the temperature in the vehicle interior will drop, causing the worst air conditioning condition, There is a risk that driving of the vehicle may be dangerous.

Therefore, an object of the present invention is to provide an operation switch that takes safety into consideration even when two forward / reverse switches whose outputs continuously change in the increasing or decreasing direction when the switch is continuously pressed are stuck.

(Means for Solving the Problems) The gist of the present invention is that, as shown in FIG. 1, two forward / reverse switches 54a whose output continuously changes in the increasing or decreasing direction when pressed continuously. , 54b, a failure determination unit 200 that determines whether the two forward / reverse switches 54a, 54b are pressed and determines whether the switch is one or both, and a result of the determination by the failure determination unit 200. In the case of sticking, the output fixed determining means 300 that outputs a predetermined fixed output, and in the case of one of the sticking results as a result of the determination by the failure determining means 200, the switch output is output by the remaining one of the forward / reverse switch. And an auxiliary operation means 400 for outputting.

(Operation) Therefore, if one or both of the forward / reverse switches 54a and 54b are pressed but do not return, and one or both of the switches fail, the failure determination means 200 determines the situation of the fixation. When the fixed output from the fixing means 300 is one of the fixed states, the auxiliary operation means 400 outputs the switch output using the other normal normal / reverse switch.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

In FIG. 2, an automotive air-conditioning control device including an operation switch for setting a temperature is provided with an inside air inlet 2 and an outside air inlet 3 at the most upstream side of an air conditioning duct 1, and the inside air inlet 2 and the outside air inlet 3 are connected to each other. The inside / outside air switching door 4 is arranged at the divided portion, and a desired suction mode can be obtained by operating the inside / outside air switching door 4 by an actuator (not shown).

The blower 5 sucks air into the air conditioning duct 1 and blows the air downstream, and an evaporator 6 is disposed behind the blower 5. The evaporator 6 is connected to a pipe together with a compressor, a condenser, a receiver tank, and an expansion valve (not shown) to form a refrigeration cycle. A heater core 8 is disposed behind the evaporator 6, and an air mixing door 7 is provided upstream of the heater core 8. By adjusting the opening degree of the air mix door 7 by an actuator (not shown), the ratio between the amount of air passing through the heater core 8 and the amount of air bypassing the heater core 8 is changed.
This controls the temperature of the blown air.

On the downstream side of the air-conditioning duct 1, a defrost outlet 9, a vent outlet 10, and a foot outlet 11 are opened in a vehicle interior (not shown), and the defrost outlet 9 and the vent outlet
A mode door 12a is provided at 10, and a mode door 12b is provided at the foot outlet 11. These mode doors 12a and 12b are controlled by an actuator (not shown) so that a desired blowing mode can be obtained. The various actuators are respectively connected to drive circuits (not shown), and these drive circuits are connected to microcomputers.
Connected to 41.

On the other hand, a vehicle interior temperature sensor 4 for detecting the temperature Tr in the vehicle interior
2.Detection signals from the outside air temperature sensor 43 that detects the outside air temperature Ta, the insolation sensor 44 that detects the amount of solar radiation on the left and right, etc. are selected by the multiplexer 46 and input to the A / D converter 47, where the digital After being converted into a signal, it is input to a microcomputer 41 described below.

Then, the control panel 48 includes an auto switch 49 for setting the driving of all air conditioners to the auto mode, an off switch 50 for turning off all the operation switches,
Air conditioner switch 51 to command compressor operation, intake switch 52 to switch intake air between outside air introduction and inside air circulation, differential switch to command defrost mode
53, temperature setting operation switches 54 (up switch 54a, down switch 5
4b), its display section 54c, a fan switch 55 for switching the rotation speed of the blower 5 and its display sections 55a and 55b, a mode switch 56 for switching the blowing mode and its display sections 56a and 56b, and the like. Is input to the microcomputer 41 described below.

The microcomputer 41 has a central processing unit (CPU), a read-only memory (ROM), a random access memory (RAM), an input / output port (I / O) and the like (not shown). Based on the signal, drive control of each door 4, 7, 12a, 12b and rotation control of the motor of the blower 5 are performed.

Next, a control operation example of the microcomputer 41 will be described.

First, referring to FIG. 3, an example of the control operation when the operation switch of the present invention fails will be described. This figure shows a flowchart of an auxiliary operation control routine when the temperature setting operation switch fails. Control starts from start step 60, and in step 61, the ignition switch is turned off.
It is determined whether or not the operation has been performed from F to ON, and if YES, the process proceeds to step 62, where the set temperature Td is initially set to 25 ° C.,
Proceed to step 63. If NO (the ignition switch is ON other than the first time), the process directly proceeds to step 63.

In step 63, it is determined whether or not the up switch 54a has been pressed, and if it has been pressed, the process proceeds to step 64,
If it has not been pressed, the process proceeds to step 66, where the up invalidation flag is set to "0". In step 64, it is determined whether or not the up invalid flag of the up switch 54a is set. When the flag for invalidating the output signal of the up switch 54a is set, the process proceeds to step 70 described below. When the flag is not set, the process proceeds to step 65.

In the step 65, the timer is started in synchronization with the start of the switch signal of the up switch 54a.

In step 67, it counts the time T ₁ the switch signal of the up switch 54a is output by determining whether exceeds 15 seconds, when the switch signal is longer than 15 seconds,
When it is determined that a failure has occurred, the routine proceeds to step 68, where the up invalidation flag is set to "1", and the routine proceeds to step 69 to reset the timer. In step 67, when the time T ₁ the switch signal is output is shorter than 15 seconds, it is determined that not failed proceeds to step 70. Steps 63 to 69 above
By the above, it is determined whether or not the up switch 54a is normal.

In step 70, it is determined whether or not the down switch 54b has been pressed, and if it has been pressed, the process proceeds to step 72,
If it has not been pressed, the process proceeds to step 71, where the down invalid flag is set to "0" in step 71.

In the step 71, it is determined whether or not the down invalid flag of the down switch 54b is set. When the flag for invalidating the output signal of the down switch 54b is set, the process proceeds to step 72 described below. When the flag is not set, the process proceeds to step 77. In step 72, the timer is started in synchronization with the start of the switch signal of the down switch 54b, and then the process proceeds to step 74.

In step 72, it is determined whether or not exceed 15 seconds by counting the time T ₂ where the switch signal of the down switch 54b is outputted, when the switch signal is longer than 15 seconds,
When it is determined that a failure has occurred, the process proceeds to step 75, where the down invalid flag is set to "1", and the process proceeds to step 76 to reset the timer. In step 72, when the time T ₂ where the switch signal is outputted is shorter than 15 seconds, the process proceeds to determined not failed to step 77. Through the above steps 70 to 76, it is determined whether or not the down switch 54b is normal.

In step 77, it is determined whether both the up-down invalid flag is set. If both flags are "0", the process proceeds to step 78, where the up-down switch is normal and the switch output is output to the control device as it is. You. If both flags are "1", the switch output cannot be changed by the switch, and the process proceeds to step 79, where a fixed output, for example, 25 ° C. is output by the temperature setting device. Further, when both flags are "0, 1", the operation can be performed by one of the normal switches 54a, 54b, so that the routine proceeds to step 80, where an operation (a subroutine to be described later) at the time of abnormality (failure) is performed. The process returns to the start step 60 via the return step 81.

Next, the operation subroutine (auxiliary operation means) at the time of the failure will be described with reference to FIG. The control is started from a start step 100. In the next step 101, it is determined whether or not the up switch 54a has been pressed, and if it has been pressed, the process proceeds to step 102, and if not, the process proceeds to step 106.

First, step 1 when the up switch 54a is pressed
The processing after 02 will be described. In step 102, it is determined whether or not the up invalid flag is “1”. If the up invalid flag is “1”, the up switch 54a cannot be used due to a failure, and the process directly proceeds to the return step 111. If the up invalid flag is "0" at step 102, the up switch 54a is normal and the process proceeds to step 103. Step 103
Then, it is determined whether or not the set temperature has reached the maximum value of 32 ° C. If it has not reached the maximum value, the process proceeds to step 104,
Each time the up switch is pressed once, the value obtained by adding 0.5 ° C. to the set temperature Td is set as the set temperature Td. Thus, the desired temperature can be changed by operating the up switch.

Next, step 1 when the down switch 54b is pressed
The processing after 07 will be described. In step 107, it is determined whether or not the down invalid flag is "1". If the down invalid flag is "1", the down switch 54b cannot be used due to a failure, and the process directly proceeds to the return step 111. If the down invalid flag is "0" in step 107, the down switch 54b is normal, and the process proceeds to step 108. Step 10
In step 8, it is determined whether the set temperature has reached the minimum value of 18 ° C. If the set temperature has not reached the minimum value, the process proceeds to step 109, and the set temperature Td is increased by 0.5 ° C each time the down switch is pressed once.
Is subtracted from the set temperature Td, and if it has reached the minimum value, the routine proceeds to step 110, where the set temperature Td is set to 32 ° C.
Thus, the desired temperature can be changed by operating the down switch. After the temperature is changed to the desired temperature, the process proceeds to the return step 111 and returns to the main routine.

(Effects of the Invention) As described above, according to the present invention, even when two forward / reverse switches such as an up or down switch fail, if the failure is one of the switches, the operation of the one switch causes the switch to operate. The output can be changed.

[Brief description of the drawings]

FIG. 1 is a functional block diagram showing the functions of the present invention, FIG. 2 is a block diagram of the present invention, FIG. 3 is a flowchart of auxiliary operation control when the operation switch of the microcomputer is malfunctioning, and FIG. It is an operation flowchart at the time of failure. 41 …… Microcomputer, 54 …… Operation switch, 54
a …… Up switch, 54b …… Down switch, 200…
... failure determination means, 300 ... output fixing means, 400 ... auxiliary operation means.

Claims (1)

(57) [Claims] The present invention relates to two forward / reverse switches whose output continuously changes in the direction of increase or decrease when the switch is kept pressed. A failure determination unit that determines whether or not the result of the determination by the failure determination unit is fixed. If the both are fixed, an output fixed determination unit that outputs a predetermined fixed output. An operating device in the event of a switch failure, comprising: auxiliary operating means for outputting a switch output by one of the remaining forward / reverse switches.