JPS6230484Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air conditioner for an automobile controlled by a microcomputer, and more particularly to a reset means for the microcomputer.

The conventional air conditioner for automobiles controlled by a microcomputer proposed in Japanese Patent Application Laid-open No. 54-110534 uses a multiplexer 2 to selectively read the outputs of a sensor group 1, as shown in FIG. , the values are taken into the microcomputer 5 via the A/D converter 3. The output of the switch group 4 is directly input to the microcomputer 5. Depending on the output of the sensor 1 and the state of the switch 4, the microcomputer 5 calculates a drive signal for the actuator valve group 7 that operates the control elements of the air conditioner. Further, the blower motor 9 is controlled by an analog voltage obtained by converting the output calculated by the microcomputer 5 through a D/A converter.

By the way, when the power supply is connected or when the ignition switch is turned to the starting position, the microcomputer is set to its initial state by a signal from the reset circuit 10.

For this reason, in conventional devices, the microcomputer is reset each time the ignition switch is turned to the starting position due to engine trouble, and temperature control is performed from a preset initial state each time. As a result, the temperature and mode change suddenly, causing discomfort to the occupants.

The purpose of this invention is to save specific control data immediately before the reset even if a reset signal is generated.
After the reset is canceled, temperature control is started using the data immediately before the reset to eliminate the above-mentioned discomfort.

The feature of this invention is that a reset signal is generated by operating a system stop switch installed on the operation panel inside the vehicle, and when the reset signal is generated, specific data is received from a microcomputer.
An auxiliary microcomputer is provided for resetting after the reception is completed, so that the microcomputer is not reset by operating an ignition switch.

An embodiment of the present invention will be described below with reference to FIG.

FIG. 2 shows a microcomputer used to control the air conditioner and a power supply and reset circuit for the microcomputer. Figure 3 shows the overall schematic configuration of the system. microcomputer 20
The system consists of a processing unit (CPU), read-only memory (ROM) for storing program procedures, data establishment memory (RAM), input/output registers (I/O), timers, etc., and an operation panel. 21 is inputted, the display device is controlled, and information regarding the set mode is output to the actuator control microcomputer 22 having another CPU. The actuator control microcomputer 22 performs arithmetic processing based on data received from another microcomputer 20 as well as data from a sensor 23 that detects the inside temperature of the vehicle or the outside temperature, etc., and sends the data to the actuator 24 of the air conditioner. Microcomputer 2 for outputting control signals and controlling the operation panel
This is to send data for display to 0.

The method for resetting the microcomputers 20 and 22 will be described below. Here, FIG. 4 shows a control flow of the microcomputer 20 for controlling the operation panel, and FIG. 5 shows a control flow of the microcomputer 22 for controlling the actuator. When this system is connected to the battery 30, the regulator 31 generates power for the microcomputers 20, 22 and their peripheral circuits. First, the power is input to the power terminal (Vcc) of the microcomputer 22 for actuator control, and the built-in power supply The only set circuit works,
The program shown in FIG. 5 starts. Here, the capacitor 32 is provided for battery backup in preparation for a drop in power supply voltage such as when the starter is activated. In step 70, set the RAM to the initial value,
The I/O is initialized to its initial state, and it is determined in step 71 whether or not the microcomputer 20 for controlling the other party's operation panel is operating using the I/O (I ₁ ) for data input. If so, in step 72 the data saved in the microcomputer 20 for control of the operation panel is requested and inputted. After inputting the sensor 23 such as a temperature sensor in step 73, data is sent and received to and from the microcomputer 20 for controlling the operation panel in step 74. When only connected to the battery 30, wait for the other party to start up in step 74. When the ignition switch 33 is turned on, the relay 34 is activated, power is supplied to the microcomputer 20 for controlling the operation panel, and the program shown in FIG. 4 is activated by the built-in power only reset. In step 60, the RAM is set to an initial value and the I/O is initialized to its initial state. In step 61, data is communicated with the microcomputer 22 for actuator control. When communication is established, step 62 is carried out. Store received data. Then, at step 63,
Microcomputer 22 for actuator control
Outputs a reset signal to The reset signal is output from the ₀₁ terminal of the microcomputer 20 for controlling the operation panel to the RESET terminal of the microcomputer 22 for controlling the actuator. That is, O ₁
The transistor 36 is turned on via the resistor 35 by changing the terminal from Hi to LO, and it is supported by the resistor 37 and becomes Hi.
When this signal is input to the RESET terminal, the actuator control microcomputer 22 is reset, and the flow of FIG. 5 is restarted from the start. Then, in step 72, the data saved in step 62 of FIG. 4 is returned to the RAM of the actuator control microcomputer 22. Then, steps 73 and 74 described above are executed, and in step 75, the sensor 2 inputted in step 73 is
Arithmetic processing is performed based on the information in step 3 and the information from the operation panel 21 input in step 74, and a control signal is output to the actuator 24 in step 76.

On the other hand, microcomputer 2 for controlling the operation panel
0, in step 64 the keys on the operation panel are input, in step 65 the meaning is determined by the key combination etc., and in step 66 the result is sent to the microcomputer 22 for actuator control.
Receive data for display. Then, in step 67, a display signal is output to the display on the operation panel 21.

When going through the above loop, the operation panel 21
Upper system stop switch (OFF switch) 3
When 8 is pressed, the system is stopped on the software, and when the switch is released, the resistor 40 and capacitor 41 are connected to the power supply side by the resistor 39.
The signal enters the buffer 42 through the integrating circuit. The output of the buffer 42 changes sharply when the voltage exceeds the threshold voltage.The output of the buffer 42 changes sharply when the voltage exceeds the threshold voltage. Microcomputer 20 through 47
input to the RESET terminal. When the reset is applied, the process returns to the start shown in FIG. 4, and in step 62 data that must be maintained such as the set temperature is received from the actuator control microcomputer 22, and in step 63 a reset signal is output. At step 72 in FIG. 5, the reset microcomputer 22 for controlling the actuator is reset to the microcomputer 22 for controlling the operation panel.
Returns the data that was moved to 0.

As described above, the present invention has the effect of making it possible to perform a reset from the operation panel 21 without losing data that must be retained.

According to the present invention, it is possible to reset the microcomputer from the OFF switch on the operation panel without turning off the ignition switch while retaining the minimum necessary data. In other words, there is no need to stop the engine.

[Brief explanation of the drawing]

Fig. 1 is a system block diagram of an air conditioner control device using a conventional microcomputer, Fig. 2 is a power supply and reset circuit diagram of an air conditioner control device according to an embodiment of the present invention, and Fig. 3 is a system block diagram of an air conditioner control device according to the present invention. A system block diagram of an air conditioner according to one embodiment, FIG. 4 is a flow chart of the microcomputer for controlling the operation panel of FIG. 3, and FIG. 5 is a control flow of the microcomputer for controlling the actuator of FIG. 3. It is a diagram. 20...Microcomputer for operation panel control, 22...Microcomputer for actuator control, 38...OFF switch.

Claims (1)

[Scope of utility model registration request] In a device having a microcomputer that calculates a signal for controlling a temperature control element in a vehicle interior based on a plurality of input signals, a system stop switch provided on an operation panel in the vehicle interior to return the microcomputer to an initial state. and an auxiliary microcomputer that receives specific data from the microcomputer when the system stop switch is operated, and resets the microcomputer after the reception is completed.