JPS6213208B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a digitally controlled operation command device for an air conditioning control device for an automobile.

2. Description of the Related Art Developments are underway to comprehensively perform various types of air conditioning control in automobiles using digital control devices including digital computers called so-called microcomputers. In addition to temperature control, the digital control device utilizes the diversity of control functions of a digital computer, and responds to various operation commands such as selecting the operating state of the heat exchanger, selecting the air blowing direction, or selecting the suction port. It is desirable to process control etc. all at once.

By the way, in automotive air conditioning control, there are many control functions such as the above-mentioned selection response control that are performed after waiting for a driving command operation by the user. Further, in these selective response controls, it is preferable to set priorities for individual driving command operations for each control function.

Therefore, in the design of a digital control device, there are constraints from the viewpoints of cost reduction, such as reduction in the number of wires connected to a digital computer, reduction in control program capacity (memory capacity) of the digital computer, and reduction in program development man-hours.

The present invention has been made in view of the above-mentioned problems, and it is possible to give driving commands for selective response control as described above to a digital computer with a small number of wirings, and to easily perform priority processing for each driving command in the digital computer. The object of the present invention is to provide a driving command device for an automobile air conditioning control device that can perform the following operations.

The present invention classifies the selection response control by its control function, and also makes some driving command operations in each control function correspond to the operations of individual command switch elements in a group of command switch elements corresponding to the control function. One of the features is that the operation of the switch elements is generated as an analog signal voltage for each group, and a number of signal voltages corresponding to the control function are selectively processed into digital signals and provided to a digital computer. Thereby, it is possible to input various operating commands by also serving as an analog-to-digital converter for providing temperature or mechanical control amounts to a digital computer, for example.

Furthermore, according to the present invention, the operation of each command switch element and the assignment of signal voltages are determined in advance in accordance with the priority order of operation command operations in each group of command switch elements, so that the digital computer can specially set the priority order. It is possible to respond only to operations with high priority without making judgments.

The present invention will be described below based on embodiments shown in the drawings. In FIG. 1, 1 is a switch group consisting of command switches 1a, 1b, and 1c for selecting the operating state of the cooling heat exchanger, and 2 is a switch group consisting of command switches 2a, 2b, 2c, and 2d for selecting the air blowing direction. Group 3 is a command switch 3 that selects the suction port.
The switch groups 1, 2, and 3 are installed on an operation panel 4 configured to be able to open and close each command switch individually.
Then, in switch group 1, command switch 1
A, 1b, and 1c are respectively assigned to issue commands to automatically stop, stop, and start the cooling heat exchanger. Also, in switch group 2, command switch 2
a, 2b, 2c, and 2d are defroster blowout, vent blowout, bilevel blowout, and
The command switches 3a and 3b in the switch group 3 are assigned to command the intake of outside air and the recirculation of inside air with respect to the suction port, respectively.

5, 6, and 7 are resistor voltage divider circuits each having a plurality of resistors R _a to R _e connected in series between constant voltage power supplies;
Signal voltages V ₁ , V 2 , and V ₃ are generated corresponding to the open and closed states of individual switches in switch groups 1, ₂ , and 3, respectively.
Here, to explain the priority order of each command switch, taking switch group 1 as an example, when switch 1a is closed, the signal voltage V ₁ of the resistor voltage divider circuit 5 is V ₁ = 0 [V ] (=V _a ). At this time, if switch 1b or switch 1
Even if c closes at the same time, the value of the signal voltage V ₁ does not change. Therefore, among the command switches 1a, 1b, and 1c, switch 1a has the highest priority. Similarly, if switch 1b is closed, the signal voltage
V ₁ is 5 x R _b / (R _a + R _b ) [V] (=V _b )
When the switch 1c is closed, the signal voltage V ₁ is 5×(R _b +R _c )/(R _a +R _b +R _c ) [V]
(=V _c ). Moreover, when neither switch is operated, the signal voltage V ₁ is 5×(R _b +
R _c +R _d +R _e )/(R _a +R _b +R _c +R _d +R _e )
[V] (=V _p ), and the signal voltage V ₁ changes to a different value V depending on the switch that is closed in this way.
_a , V _b , V _c , V _p , and switch 1
Priorities are set in the order of a, 1b, and 1c. Further, the command switches 2a, 2 in the switch group 2
Similarly, the command switches 3a, 3b in the switch group 3 as well as the command switches 3a, 3b in the switch group 3 generate different voltages in accordance with the priority order corresponding to each closed switch.

8 is the selection signal 10 of the digital computer 10
A multiplexer that selects the input signal line by a, and the signal voltage of the resistor voltage divider circuits 5, 6, and 7.
It selectively outputs V ₁ , V ₂ , V ₃ , and a signal voltage V _s from a signal voltage generator such as a temperature sensor. 9
is a known analog-to-digital processing circuit including a digital-to-analog converter and a voltage comparator, which compares the analog converted voltage of the digital value signal 10b from the digital computer 10 and the output signal voltage 8a from the multiplexer 8. By repeating the process of giving the signal 9a to the computer 10, when the signal voltage 8a corresponds to the digital value signal 10b, the computer 10 is made to recognize the magnitude of the analog signal voltage with the digital value signal 10b. It is something.

The digital computer 10 is a main part of a digital control device, and is composed of a one-chip microcomputer, and controls the air conditioning of an automobile based on various digital value signals received via an analog-digital processing circuit 9 through processing of a control program. It determines the operating state of the device and drives various operating mechanisms (not shown).

Then, the digital computer 10 executes a second control program in the process of a control program for determining the open/closed state of each switch group 1, 2, and 3.
The processing shown in the figure and FIG. 3 is executed. That is, for multiplexer 8, switch group 1,
Processing routines 101, 103, 1 that instruct passage of one signal voltage V ₁ , V ₂ , V ₃ corresponding to voltages 2 and 3
05, the analog-digital processing circuit 9 is operated to recognize the signal voltage as a digital value, and the magnitude of the digital value is determined to determine which command switch is closed or all command switches are open. Routine 10 to determine
2, 104, and 106 (details shown in FIG. 3) are executed alternately.

By the way, the output signal voltages V ₁ , V ₂ , V ₃ of the resistance voltage divider circuits 5, 6, 7 are V _p , V 3 as shown in FIG.
Any one of the five values of _d , V _c , V _b , V _a
However, the computer 10 recognizes V _a <V _ab <V
_b , _Vb < _Vbc < _Vc , _Vc < _Vcd < _Vd , _Vd < _Vdp <
The comparison reference voltages V _{ab ,}
V _bc , V _cd , and V _dp are assumed, and they are sequentially compared with the recognized digital value signals V ₁ , V ₂ , and V ₃ (step 2).
02, 203, 204, 205), it is determined which of the values V a to _{V p} the digital value signals V ₁ , V ₂ , and V ₃ are at, and the corresponding command switch is determined (steps 206 and 205). 207, 208, 20
9,211).

In this way, the digital controller has resistor voltage divider circuits 5, 6, 7 corresponding to switch groups 1, 2, 3.
The command operation of one command switch in each switch group is recognized by the magnitude of the signal voltages V ₁ , V ₂ , and V ₃ generated from the switch group, and the control function is driven based on this. However, in the resistor voltage divider circuits 5, 6, and 7, even if two or more command switches are operated at the same time, a signal voltage with a value corresponding to the command switch with a higher priority is generated, so that the control device has priority. Control operations of a higher order can be performed. The priority order can be set arbitrarily in consideration of safety for driving a car, power saving of the device, etc., but in this embodiment, for example, by setting the priority order as described above, the defroster blowing direction is the best compared to other blowing directions. Priority is given to vent blowing toward the occupant's face over heater blowing toward the lower body. In addition, priority is given to stopping the operation of the cooling heat exchanger.

Note that the present invention is not limited to the embodiments described above, and in particular, the signal processing means for processing a signal voltage into a digital value signal may be a pure analog-digital processing circuit in addition to the analog-digital processing circuit in the above-mentioned example. A converter may also be used.

Alternatively, a modulation signal whose frequency or pulse width changes in response to the signal voltage may be generated as a digital value signal and input to the computer 10.

Furthermore, these signal processing means may be integrated with the digital computer on one integrated circuit substrate.

Furthermore, in the configuration of FIG. 1 in the embodiment described above, when the signal voltages V ₁ , V ₂ , V ₃ are input to the processing circuit 9 via the multiplexer 8,
Reference voltages V _ab , V _bc , V _c from the computer 10
By supplying the digital value signal 10b corresponding to _d and V _de to the processing circuit 9, the comparison signal 9a can be directly recognized by the computer 10 as a digital signal corresponding to the opening and closing of the command switch.

Further, in addition to the control functions controlled using a group of switches shown in the embodiment, the present invention can be applied to any plurality of control functions.

In addition, as a switching element, in addition to a mechanical contact type, a semiconductor pressure-sensitive element may be used as long as it has substantially two operating positions, or it may be combined with other switching semiconductors. good.

As described above, in the present invention, the intended purpose can be achieved by consolidating wiring related to driving commands for selective response control and setting priorities in the hardware section.

[Brief explanation of the drawing]

FIG. 1 is an electrical wiring diagram showing one embodiment of the device of the present invention, and FIG. 2 is a digital computer 10 in FIG. 1.
FIG. 3 is a processing flowchart showing an overview of the response processing to the driving command of FIG.
2, 104, and 106, and FIG. 4 is an explanatory diagram regarding priority setting. 1a, 1b, 1c, 2a, 2b, 2c, 2d,
3a, 3b...Switch serving as a command switch element, 4...Operation panel serving as operating means, 5, 6,
7...Resistive voltage divider circuit, 8, 9...Multiplexer and analog-digital processing circuit forming signal processing means, 10...Digital computer forming main part of digital control device.

Claims (1)

[Claims] 1. An automobile configured to centrally control multiple selection response control functions in an automobile air conditioner, such as selecting the operating state of a heat exchanger, selecting the air blowing direction, or selecting the suction port, using a digital control device. An operation command device used in a commercial air conditioning control device, the operation means having a plurality of command switch elements for selectively commanding a control mode of each of the plurality of control functions, and the plurality of control functions. Each command switch element is connected to the group of command switch elements according to its function, and when an individual command switch element in each group of command switch elements is operated, each command switch element is assigned according to a predetermined priority order. a plurality of resistor voltage divider circuits configured to generate signal voltages, and signal processing means that selectively processes the signal voltages from the plurality of resistor voltage divider circuits into digital signals and provides the digital signals to the digital control device. An operation command device for an automotive air conditioning control device, comprising: