JPS6339445B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an air conditioner for an automobile, which controls the position of a mix damper that adjusts the air outlet temperature, and air blow switching control that switches a mode damper that selects a plurality of air outlets. It is related to the device.

Conventional Structure and Problems The structure of a wind circuit in a conventional air conditioner of this type will be explained with reference to FIG. The air conditioner main body A has an inlet 1 and a plurality of outlets 2a to 2e. Also, inside the air conditioner main body A, there are an inside/outside air switching damper 3 that switches the intake direction to switch between air circulation in the vehicle interior and outside air introduction, a blower 4, an evaporator 5, a heater core 6, and a blowout air. A wind circuit is provided which includes a mix damper 7 that adjusts the temperature and a mode damper 8 that switches the air blowing from each of the air outlets 2a to 2e.
The air sucked in by the blower 4 from the suction port 1 is sent to the evaporator 5. Part or all of the air cooled through the evaporator 5 flows into the heater core 6 depending on the degree to which the mix damper 7 is opened or closed. Then, the cooled air that has just passed through the evaporator 5 and the warm air that has passed through the heater core 6 are mixed together upon exiting the heater core 6. In this way, the mix damper 7 is opened and closed to change the mixing ratio of cooled air and warm air, thereby adjusting the temperature of the blown air. By switching the mode damper 8, the air whose temperature has been adjusted in this way is blown out into the vehicle from designated air outlets 2a to 2e.
Normally, the mix damper 7 and the mode damper 8 are switched by operating the drive mechanism of each damper via a wire, by blowing pressure from an engine, or by using a motor drive source.

Here, the two dampers, the mix damper 7 and the mode damper 8, are controlled by one motor and a clutch mechanism that selectively transmits the driving force of this motor to the mix damper 7 side or the mode damper 8 side. In this case, the control shown in Figure 2 was used.

First, five types of input are required.
The mode selection input a is an input determined by the position of the mode damper 8, and the air outlets 2a to 2e to be used are selected by this input. The temperature setting input 6 is an input that determines the temperature of the air to be blown out, and determines the position of the mix damper 7. Mode damper position input c and mix damper position input d are:
This signal indicates where the mode damper 8 and mix damper 7 are currently located. Finally, the mix damper limiter input e is the mix damper limit input e.
is at the right or left end and indicates that there is no further movement. The control section f judges these inputs and outputs an output to the drive section g. The output from the control section f is to determine the start/stop and rotation direction of the motor section h, and whether to transmit the power of the motor section h to the mix damper shaft k or the mode damper shaft j to the clutch mechanism i. This is the content. The drive unit g moves the mix damper 7 and the mode damper 8 according to the output of the control unit f.
The motor unit h rotates according to the instructions for starting and rotating direction, and stops if there is an input to stop. The clutch mechanism i transmits the power of the motor section h to the mix damper shaft k or the mode damper shaft j by turning on and off its current supply. The mix damper shaft k and the mode damper j are connected to respective damper drive mechanisms, and the dampers move in accordance with the rotation of the shafts. For example, when the clutch mechanism turns on, the mode damper shaft j moves, and conversely, when the clutch mechanism turns off, the mix damper axis k moves.

Here, a case will be described in which the mode selection input takes priority over the temperature setting input and moves the mode damper 8.

When there is an input to move the mode damper 8, even if the mix damper 7 is in the process of moving, the mode selection is prioritized for the time being, so
It acts to drive the mode damper 8. That is, the control section f determines in which direction the mode damper shaft j should be rotated based on the current position input of the mode damper 8, and sends an on signal to the motor section h and an on signal to the clutch mechanism i to the drive section g. tell to. According to the command, the drive section g rotates the motor section h to turn on the clutch mechanism i. When the control section f senses that the mode damper 8 has moved to a predetermined position based on the mode damper position input c, it sends a command to the drive section g to stop the motor section h and turn off the clutch mechanism i. At this point, control immediately passes to the mix damper 7. If neither input is present, the control section f is activated by the clutch mechanism i.
Waiting in the off state of operation.

However, in this control, since the motor section h and the clutch mechanism i are turned off at the same time, the clutch mechanism i is turned off while the motor section h is moving by inertia. When the clutch mechanism i turns off, the inertial power of the motor section h is transmitted to the mix damper 7, causing the mix damper 7 to move.
Predetermined temperature cannot be obtained. On the other hand, the mode damper 8 also moves due to inertia, and as a result, there is a risk that the mode damper 8 will go too far and a predetermined mode will not be obtained. Further, depending on the type of clutter mechanism, the mode damper 8 may move in the opposite direction.

In this way, when the mix damper 7 moves due to inertia or the mode damper 8 moves too far due to inertia or returns to its original position, the control section f attempts to return the mix damper 7 and mode damper 8 to the predetermined position. 8 is frequently reciprocated, and the temperature and mode become unstable, resulting in a loss of comfort.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks, and an object thereof is to provide a ventilation switching control device for an automobile air conditioner that can ensure reliable operation of mix dampers and mode dampers and improve comfort. shall be.

Composition of the Invention In order to achieve the above-mentioned object, the ventilation switching control device of the present invention provides an air blower switching control device that switches between internal and external air circulation within a vehicle interior and external air introduction into an air conditioner main body having an inlet and a plurality of outlets. a wind circuit having a switching damper, a blower, an evaporator, a heater core, a mix damper for adjusting the temperature of the blown air, a mode damper for switching the blowing position of the blowing air; a temperature adjusting operation of the mix damper; and a blowing position switching operation of the mode damper. An air conditioner for an automobile is configured by providing a switching device for driving the mix damper and the mode damper, and a single motor for driving the mix damper and the mode damper to open and close the mix damper and the mode damper. and a clutch mechanism that transmits a signal to the mix damper, and when the clutch mechanism switches from the mix damper to the mode damper or from the mode damper to the mix damper, the motor stop signal is delayed for a certain period of time to send the switching operation of the clutch mechanism. This configuration includes a means.

By delaying the switching operation of the clutch mechanism in this manner, malfunctions of the mix damper and mode damper can be prevented.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Incidentally, since the specific structure of the wind circuit is conventionally well known, it will be explained using FIG. 1. Further, since the clutch mechanism may be configured to switch its operation by conventionally known solenoid energization control, a description thereof will be omitted.

First, the general configuration for controlling will be explained with reference to FIG. In the same figure, mode selection input 1
1 is an input determined by the position of the mode damper 8, and is represented by a digital signal indicating whether it is grounded or high impedance.
The temperature setting input 12 is an input for determining the temperature of the air to be blown out, and is expressed as an analog signal proportional to the desired position of the mix damper 7. Mix damper position input 13 and mode damper position input 14 are input to mix damper 7 and mode damper 8.
is expressed as an analog signal proportional to the current position of the The mix damper limiter input 15 is a signal indicating that the mix damper 7 is at the right or left end and will not move any further, and is represented by a digital signal indicating whether it is grounded or high impedance. These inputs are processed by a control section 16 made up of transistors, comparators, and the like. The output from this control section 16 is expressed as a digital signal that indicates whether it is all grounded or high impedance. Drive unit 17 that drives mix damper 7 and mode damper 8
The motor section 18 is composed of a motor section 18 which is a driving source, and a clutch mechanism 19 which switches and transmits the driving force of the motor section 18 to a mix damper shaft 20 or a mode damper shaft 21. Clutch mechanism 19
The clutch is switched by turning on and off a solenoid 22 shown in FIG. 2
3 is a delay circuit, and the off signal to the clutch mechanism 19 output from the control section 16 is transmitted through this delay circuit 23.
The signal is output to the clutch mechanism 19 later than the motor stop signal. This delay time is the time required for the motor rotating due to inertia to completely stop.

Next, an example of the delay circuit 23 will be explained with reference to FIG. Here, the same components as those shown in FIG. 3 are given the same reference numerals, and the explanation thereof will be omitted. In the same figure, comparator 3
The positive input terminal of No. 1 is fixed to the reference voltage V ₁ by resistors R ₁ and R ₂ . In a standby state or a state in which the mix damper 7 is in motion, the output terminal X of the control section 16 is in a high impedance state. In this state, the capacitor C ₁ is charged, and the input voltage V ₂ of the comparator 31 is approximately the power supply voltage. As a result, the relationship of input voltage V ₂ >reference voltage V ₁ is established, and the output of the comparator 31 becomes low level. Therefore, transistor Q ₁ is in an OFF operation, and solenoid 22 is not energized. Note that R ₃ to R ₆ are resistances.

Next, when an on signal (switching signal) is output from the control section 16 to the clutch mechanism 19, the output terminal X is connected to ground. Therefore, comparator 3
The negative input terminal of 1 is grounded and the input voltage
V ₂ =0, and the charge in the capacitor C ₁ is also discharged. Then, the relationship of reference voltage V ₁ >input voltage V ₂ is established, the output of the comparator 31 becomes high level, and the transistor Q ₁ is turned on. As a result, the solenoid 22 is also turned on, and the clutch mechanism 19 performs a switching operation.

When the control section 16 outputs the off signal again, the output terminal X becomes a high impedance state. However, since the capacitor C ₁ has been discharged, the input voltage V ₂ does not immediately become the supply voltage.
When the capacitor C ₁ is charged through the resistor R ₃ and the voltage across the capacitor C ₁ , that is, the input voltage V ₂ becomes greater than the reference voltage V ₁ , the comparator 3
The output of transistor Q 1 becomes low level, and the transistor Q ₁
is turned off, solenoid 22 is also turned off, and clutch mechanism 19 performs a switching operation. This delay time is determined by resistors R ₁ , R ₂ , R ₃ and capacitor C ₁
It is determined by the value of

Therefore, by making the delay time longer than the time required for the motor to completely stop,
Inconveniences such as when the mix damper 7 and the mode damper 8 deviate from their normal positions and stop due to the inertia of the motor can be prevented.

Effects of the Invention As explained above, according to the present invention, since the clutch mechanism is switched after a fixed time delay from the motor stop signal, the mix damper and the mode damper can be reliably stopped at their normal positions. , stable temperature control and mode settings can be performed, and comfort can be improved.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram of a conventional automobile air conditioner, Fig. 2 is a circuit block diagram of a blower control device in the same air conditioner, and Fig. 3 is an automobile air conditioner according to an embodiment of the present invention. FIG. 4 is a circuit diagram of a delay circuit in the air blow switching control device. DESCRIPTION OF SYMBOLS 1... Suction port, 2a-2e... Air outlet, 3... Inner/outside switching damper, 4... Air blower, 5... Evaporator, 6... Heater core, 7... Mix damper, 8... Mode damper, 16... Control section, 17... Drive section, 18...Motor section, 19...Clutch mechanism, 20...Mix damper shaft, 21...Mode damper shaft, 22...Solenoid,
23...Delay circuit, 31...Comparator, A...Air conditioner body, _Q1 ...Transistor, _C1 ...Capacitor, _R1 to _R6 ...Resistor.

Claims (1)

[Claims] 1 Inside the air conditioner body, which has an inlet and a plurality of outlets, there is an inside/outside air switching damper that switches between air circulation inside the vehicle and outside air introduction, a blower, an evaporator, a heater core, and a mix damper that adjusts the temperature of the blown air. An air conditioner for an automobile is configured by providing a wind circuit having a mode damper for switching the blowout position of the blowing air, and a switching device for controlling the temperature of the mix damper and switching the blowout position of the mode damper, The switching device includes a single motor that opens and closes the mix damper and the mode damper, and a clutch mechanism that selectively transmits the drive of this motor to the mix damper or the mode damper. When switching from damper or mode damper to mix damper,
A blower switching control device for an automobile air conditioner is provided with a delay means for delaying the switching operation of a clutch mechanism by delaying a motor stop signal for a certain period of time.