JPS5940919A - Control device for vehicle air-conditioning system - Google Patents

Abstract

PURPOSE:To keep passengers from being subjected to an uncomfortable feeling, by restraining the maximum air capacity of a motor blower device in accordance with the result of discimination of the heating mode upon heating even though the air capacity of the motor blower device corresponds to either one of those of the manual mode and the passenger compartment heat load mode. CONSTITUTION:Upon the manual mode of an air-conditioning system by a manual control switch 2, an air-conditioning control device comprising a microcomputer 1 applies a voltage of 11V lower than the source voltage of 12V to a motor blower device 8 when the heating mode by a mode control switch 1 is discriminated. Further, upon the automatic control mode due to the heat load of a passenger compartment in which mode the switch 2 is not operated, the applied voltage to the motor blower device 8 is determined within a range having its upper limit value of 11V in accordance with the deviation between the passenger compartment temperature 3 and the desired temperature. Meanwhile, upon the cooling mode, the maximum applied voltage is determined to be 12V. Thereby, it may be eliminated to adversely give a cold feeling upon the heating mode due to an excessive air capacity.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a car air conditioner control device capable of cooling and heating that electrically controls at least the air blowing capacity of an electric blower. This invention relates to a car air conditioner control device (1) configured to selectively control the air conditioner using a signal or an electric signal corresponding to the heat load in the vehicle interior.

In car air conditioners, l! [Heat source,! 1.
The system is configured to use cooling water from the motor vehicle, circulate the heater core, heat the air flow generated by the electric blower, and supply the heated air to the passenger compartment. However, due to the design, the heat dissipation capacity of the heater core is sometimes small compared to the blowing capacity of the electric blower, and in this case, even though the maximum heat dissipation effect is generated, the temperature of the airflow decreases, causing discomfort to the occupants. Sometimes. ′ This is especially true for car air conditioner control devices that are configured to selectively control the air blowing capacity of an electric blower using an electric signal corresponding to manual operation or an electric signal corresponding to the heat load in the passenger compartment. If the heating capacity decreases due to the above-mentioned causes during automatic control based on the system, the occupant switches the operation of the device to manual operation and tries to obtain the maximum air blowing capacity in the hope of achieving maximum heating. However, this does not essentially solve the problem and does not eliminate the discomfort.

(2) The present invention has been developed in view of the above-mentioned circumstances, and when heating, the electric blower can be used either when the blowing capacity is compatible with manual operation or when the blowing capacity of the electric blower is compatible with the heat load of the passenger compartment. It is an object of the present invention to provide a car air conditioner control device which makes it possible to eliminate the above-mentioned discomfort by suppressing the maximum air blowing capacity depending only on the determination result that the vehicle is in the heating mode.

FIG. 1 shows an embodiment of the present invention, and in this electrical block diagram, reference numeral 1 is a mode operation switch that selects and commands cooling mode and heating mode, for example, a contact switch whose open/close state changes with each operation. Become. Reference numeral 2 denotes a manual operation switch for controlling the air blowing capacity, and in this embodiment, a contact switch is used which is closed when specifically commanding the maximum air blowing capacity. It goes without saying that it is possible to use an electric operating device that can adjust the power level such as strong, pharmacopoeia, intermediate, etc. stepwise or continuously as necessary.

3 is a room temperature sensor that detects the air temperature inside the vehicle, and 4 is a temperature setting device (3) that sets a target temperature inside the vehicle.

The electrical signals generated by each of the switches 1.2, the sensor 3, and the temperature setting device 4 are converted into digital signals that can be processed by the microcomputer 6 via the input circuit 5, and are sent to the microcomputer 6. Input circuit 6 is analog
It has a digital conversion circuit and a waveform shaping circuit.
Like the output circuit 7 which amplifies each output signal from the microcomputer 6 to a required power value, it is a well-known circuit.

Reference numeral 8 is an electric blower device for a car air conditioner, which is composed of a DC motor, converts a digital signal indicating the blowing capacity generated by the microcomputer 6 into an analog signal in an output circuit 7, receives the amplified signal, and converts it into electrical energy after the amplification. Rotates with the corresponding torque.

Reference numeral 9 denotes a mode damper controller for a car air conditioner, which responds to an electric signal to switch between a cooling mode in which the airflow direction is from the upper duct and a heating mode in which the same direction is directed from the lower duct.

Although not shown, the car air (4) control unit to which the present invention is applied has a cooling heat exchanger and a heating heat exchanger like a typical unit, and furthermore, the temperature of the blown air can be adjusted automatically or It has a built-in manually adjustable temperature regulator.

The microcomputer 6 executes arithmetic processing based on a preset control program, and in the process the input circuit 5
It receives an electrical signal from the output circuit 7 and applies the electrical signal to the output circuit 7 through processing according to the flowchart shown in FIG.

FIG. 2 shows a control step of the control program of the microcomputer 6 for determining the air blowing capacity according to the present invention.

The control step is to set the car air conditioner to cooling mode F'? 'Processing is branched depending on whether it is operating or in heating mode. That is, in step 10, the open/closed state of the mode operation switch 1 is checked, and if the heating mode is commanded, the process advances to step 11, and if the cooling mode is commanded, the process advances to step 21.

Step 11 and subsequent steps show air conditioning control (5) in the heating mode. First, in step 11, an electric signal is sent to the mode damper regulator 9 via the output circuit 7 to realize the heating mode, that is, downward blowing. give.

Next, in step 12, it is determined whether the manual operation switch 2 is being operated. Here, manual operation switch 2
When is being operated, the electric blower device 8 leaves automatic control and operates at the maximum blowing capacity, but when it is not being operated, the blowing capacity is automatically determined.

That is, when the manual operation switch 2 is operated, in step 14, the voltage Vm applied to the electric blower is set to 11V-, which is lower than the predetermined constant constant power supply voltage 12V.

On the other hand, under automatic control when the manual operation switch 2 is not operated, the absolute deviation between the cabin air temperature Tr and the target temperature Tset set by the temperature setting device is within the range where the maximum value is set to 11V in step 13. Based on this, the voltage Vm to be applied to the electric blower device is determined (6) using a predetermined calculation formula or map reading method. In this way, the vehicle interior air temperature Tr and the target temperature T
The method for determining the air blowing capacity based on the deviation from s e t is known per se, and differs from the known method in that the maximum value is lower than the steady voltage of 12V, and the maximum value when manual operation switch 2 is operated. The value is the same as the value.

On the other hand, steps after step 21 show air conditioning control in the cooling mode. First, in step 21, an electric signal is sent to the mode damper regulator 9 via the output circuit 7 to realize the cooling mode, that is, upward blowing. give.

Next, in step 22, it is determined whether the manual operation switch 2 is being operated. Here, manual operation switch 2
is being operated, in step 24, a predetermined constant constant power supply voltage of 12 V- is set as the applied voltage Vm to the electric blower.

On the other hand, under automatic control when the manual operation switch 2 is not operated, the maximum value is set to the constant power supply voltage 1 in step 23.
The vehicle interior air temperature within the range of 2V (7) degrees Tr and the target temperature Tset set by the temperature setting device
The applied voltage Vm to the electric blower device is determined based on the absolute deviation from the electric blower using a predetermined calculation formula or a map successive method.

Steps 13 and 23 above, and Step 1
As is clear from the comparison between Step 4 and Step 24, in the heating mode, the maximum air blowing capacity is IIV, which is lower than the steady value of the power supply voltage of 12V, compared to the cooling mode. This is the same for both manual operation and automatic control; once heating mode is commanded and there is no change thereafter, the maximum applied voltage is 11V when manual operation switch 2 is operated.
The electric blower device 8 is activated to determine the air blowing capacity of the car air conditioner, and if the manual operation switch 2 is not operated, the maximum The air blowing capacity is automatically determined within the range of 11V. On the other hand, in cooling mode, there is no limit to the maximum applied voltage, and the battery generated voltage (1 at steady voltage)
2V) is applied as is.

(8) Therefore, according to this device, it is completely eliminated that in the heating mode, the amount of air blown is too large and gives a feeling of cooling, and in the cooling mode, even if the cooling capacity of the heat exchanger is insufficient, It also has the effect of compensating for the cold sensation by increasing the amount of air blown sufficiently.

In carrying out the present invention, the determination between the cooling mode and the heating mode is not limited to the state of the switch 1 that can be operated by the passenger as in the above embodiment, but also based on the deviation between the vehicle interior temperature and the target temperature, etc. The present invention can also be applied to a known car air conditioner control device that automatically controls heat load conditions.

As described above, according to the present invention, the air blowing capacity is limited regardless of whether the air blowing capacity is determined manually or automatically, so that it is possible to prevent the occupant from feeling insufficiently cool. It exhibits an excellent effect of not having any

[Brief explanation of drawings]

FIG. 1 is an electrical program diagram of an embodiment of the present invention, and FIG. 2 is a flowchart (9) showing a control program for the microcomputer 6 in the configuration of FIG. 1...Mode operation switch, 2...Manual operation switch, 3...Room temperature sensor, 4...Outside temperature sensor, 5...
...Input circuit, 6...Microcomputer, 7...
- Output circuit, 8... electric blower device. Representative Patent Attorney Takashi Okabe (10)

Claims (1)

[Claims] In a car air conditioner control device configured to selectively control the air blowing capacity of an electric blower by an electric signal corresponding to manual operation or an electric signal corresponding to the heat load of a vehicle interior, the heating mode is determined and the electric blower Control means for determining the maximum value of the air blowing capacity depending only on the determination result, both when the air blowing capacity of the air blowing device corresponds to manual operation and when it corresponds to the heat load of the passenger compartment. A car air conditioner control device equipped with: