JPS6012734Y2 - Automotive air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air conditioner for an automobile that includes a compressor that is driven by receiving rotational force from a vehicle engine.

Conventionally, the compressor of this type of device is connected to the vehicle engine and driven to rotate when it is necessary to operate the refrigeration cycle for temperature control, as shown in Japanese Patent Application Laid-Open No. 54-110534. It was controlled so that it was disconnected from the vehicle's engine and stopped when it did not need to be driven.

The purpose of this invention is to connect the compressor to the engine when the vehicle is braking, regardless of temperature control requirements, and use the engine's wasted rotational force when the vehicle is braking to rotate the compressor, thereby storing cold in the evaporator. An object of the present invention is to provide an air conditioner for an automobile, which can circulate lubricating oil for a compressor when the refrigeration cycle is not in use.

The feature of this invention is that it is equipped with a braking state detection means that generates an output when the vehicle is in a braking state, and also determines whether or not it is necessary to operate a cycle for temperature control. The microcoscipulator, which generates operation and stop signals, has a function to determine whether or not there is an output from the braking state detection means, and when there is an output from the braking state detection means, the compressor is activated regardless of temperature control requirements. By adding a function to generate a driving signal for driving the vehicle, the above object can be achieved by only providing a means for detecting the braking state of the vehicle as an external circuit.

An embodiment shown in FIG. 1 will be explained in detail below.

A mode selector 11 for selecting an operating mode and a temperature setting lever 12 are attached to the panel surface.

The electrical signals of the temperature setting resistor 13 linked to the temperature setting lever 12, the inside air temperature sensor 9, the outside air temperature sensor 10, and the feedback potentiometer 14 for position detection linked to the air mix door 4 are sent to the microcomputer 15.
selectively from the multiplexer 16
It passes through the converter 17 and is input from l1015a.

According to control signals from the microcomputer 15, negative pressure is applied to the actuators 18, 19, 20 and the power servo 21 that drives the air mix door 4, and the blower motor 2 is controlled via the blower motor drive circuit 22.

In addition, temperature control compares the air mix door opening degree calculated based on the information of each temperature sensor with the current air mix door opening degree brought about by the feedback potentiometer 14, and if it deviates to the heating side, Atmospheric pressure is passed through the power servo 21, and when it is shifted to the cooling side, negative pressure from the vacuum tank 23 using engine negative pressure is passed through the power servo 21 and the air mix door 4 is operated.

The microcomputer 15 includes a processing unit (CPU) 15 b, a read-only memory (ROM) 15 c for storing program procedures, a data establishment memory (RAM) l 5 d, and an input/output register (11
0) Built-in timer 15a and timer 15e.

FIG. 2 is a control flowchart of this embodiment, a detailed flowchart of refrigerant compressor control is shown in FIG. 3, and a detailed flowchart of air mix door control is shown in FIG. 4.

3L mode selector 11 that performs initialization such as initial setting of RAM 15d and initial state setting of l1015a.
Enter the selected mode information [, 31, Determine whether the ``OFF'' mode is selected and stop the system. 32゜When the OFF'' mode is selected, use the command to stop the system, such as stopping the blower motor 2. After processing 33, the process returns to step 31.

On the other hand, when a system operating mode other than "OFF" mode is selected, the temperature setting resistor 1
3. Convert the analog information of the inside air temperature sensor 9, outside air temperature sensor 10, and feedback potentiometer 14 into digital quantities and input them. 34. Using these input information, control quantities are calculated using the following equation determined experimentally. Determine X and Y, determine the average voltage to be applied to the blower motor 2 from the characteristics shown in FIG. 5 and store them in advance in the microcomputer 15 (35), and determine the opening degree of the air mix door 4 from the characteristics shown in FIG. Here, Tr is the vehicle interior air temperature provided by the inside air temperature sensor 9, Ts is the set temperature set by the temperature set value signal 13, and Ta is the outside air temperature provided by the outside air temperature sensor 10.

The control amount X is the deviation between the inside air temperature and the set temperature plus a correction for the outside air temperature, and the control amount Y is the addition of a time integral term for compensating for the residual deviation with respect to the temperature deviation X.

The optimum air volume can be obtained by applying a control signal 37 to the blower motor drive circuit 22 so that the blower motor 2 has the voltage calculated in step 35.

Then, in step 38, the refrigerant compressor 8 is controlled.

To explain using the flowchart of FIG. 3, 50 is when the difference between the temperature TS set by the temperature setting lever 12 and the vehicle interior temperature Tr is larger than a predetermined value, and 51 is when the outside air temperature Ta is smaller than a predetermined value. Furthermore, when the blower motor 2 is stopped to prevent freezing of the refrigerant evaporator 52, the refrigerant compressor 8 does not need to be operated or should not be operated, so in step 53 the refrigerant compressor 8 is to stop.

In step 54, the refrigerant compressor 8 is used to improve fuel economy.
When the refrigerant compressor 8 is operating intermittently, it is determined that the refrigerant compressor 8 is stopped (54). Judging from the information 55, if the foot brake is operating, it is considered to be a power load, and the refrigerant compressor 8 is operated. I'll explain with an interrupt.

In step 39, an air distribution door pattern is determined according to the air mix door opening degree calculated in step 36 according to the table below.

Then, in step 40, the negative pressure supplied to the actuators 18, 19, and 20 is intermittent based on the combination of the selection mode input in step 31 and the pattern determined in step 39, and the ventilation door is set in a predetermined mode. to control.

The process then continues to the control 41 of the air mix door 4.

The opening degree of the air mix door 4 is controlled according to the flow shown in FIG.

comparing the opening degree of the air mix door 4 determined in step 36 with the current position of the air mix door obtained from the feedback potentiometer 14 in step 34;
When the air mix door 4 is shifted to the heating side, an on/off valve 25 is opened to intermittently supply negative pressure to the power servo 21, and a three-way valve 26 is operated to switch between atmospheric pressure and negative pressure. 62° with atmospheric pressure conduction, and
When the air mix door 4 is shifted to the cooling side, the on/off valve 25 is opened 63 and the three-way valve 26 is connected to negative pressure 6.
4° On the other hand, when the calculated value and the current position match, the loop returns to step 31 after completing the work of 65° or more to close the on-off valve 25 to fix it in that state.

On the other hand, various methods have been proposed for intermittent operation of the refrigerant compressor 8, but here, a method of determining the air conditioning load from the gradient of change in the vehicle interior temperature will be explained.

The time required to determine the air conditioning load and to turn on and off the refrigerant compressor 8 is determined by counting the pulses generated from the system clock of the microcomputer 15 using the timer 15e, and calculating the number of timer interrupts that occur in a certain period of time due to the overflow. make.

FIG. 7 shows the flow at timer interrupt.

Save the register information of the main routine to the memory area provided in the RAM 15d. 70° Count the number of interrupts to create a time interval, measure the temperature gradient, and calculate the air conditioning load accordingly. 71° According to the air conditioning load determined in step 71. In step 73, the number of interruptions is counted to create a time interval for controlling the intermittent time of the refrigerant compressor.

In step 74, it is determined whether the refrigerant compressor 8 is currently operating, and if it is operating, in step 75, the refrigerant compressor 8 is
It is determined whether it is time to stop the mode, and when the time has come, the mode is reversed in step 77.

On the other hand, if the refrigerant compressor 8 is currently stopped, it is determined whether it is time to start it (76), and when the time has come, the process proceeds to step 77 to change the mode of the refrigerant compressor from stop to action.

Then, in step 78, the information in the main routine register saved in step 70 is returned to the register, and the process returns to the main routine.

In the above explanation, as a means of detecting the braking state of the vehicle,
A method was used to detect the state of the switch that opens and closes the energized circuit of the brake light that lights up when the foot brake is depressed.1
However, the present invention is not particularly limited to this.

With this flow, it is desirable to apply a power load to the vehicle even when the refrigerant compressor 8 is operated intermittently to improve power economy.In other words, when decelerating with the foot brake, the refrigerant compressor 8 is continuously operated. By operating the refrigeration cycle, the wasted rotational force of the vehicle can be used to operate the refrigeration cycle, storing cold and improving the dehumidification effect.

Furthermore, by connecting the compressor as a load during braking, the braking effect can be enhanced.

As explained above, according to the present invention, by simply adding a means for detecting the braking state of the vehicle as an external circuit, wasted torque of the vehicle can be recovered and used for cold storage, dehumidification, or circulation of lubricating oil for the compressor. It is possible and extremely practical.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of an automobile air conditioner which is an embodiment of the present invention, Fig. 2 is a control flowchart of the automobile air conditioner shown in Fig. 1, and Fig. 3 is an illustration of an automobile air conditioner shown in Fig. 1. 4 is a control flowchart of the air mix door of the automobile air conditioner shown in FIG. 1, FIG. 5 is a control characteristic diagram of the blower motor of FIG. 1, and FIG. Control characteristics diagram of the air mix door in Figure 1,
FIG. 7 is a detailed flowchart of the timer interrupt shown in FIG. 1... Intake door, 2... Pro motor, 3... Refrigerant evaporator, 4... Bent air mix door, 5... Water heater, 6... ...Vent door, 7...Floor door, 8...Refrigerant compressor, 9...Inside air temperature sensor, 10...
... Outside temperature sensor, 11 ... Mode selector, 12 ... Temperature setting lever, 13 ...
・Temperature setting resistor, 14... Feedback potentiometer, 15... Microcomputer, 15
a...I 10゜15b...CPU,
15c...ROM, 15d...RAM
, l 5e...Timer, 16...Multiplexer, 17...A-D converter, 18.
19. 20... actuator, 21...
...Power servo.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. Determine whether or not it is necessary to operate the refrigeration cycle for temperature control, and when it is determined that it is necessary to operate, an operation signal is issued, and when it is determined that there is no need to operate it A microcomputer that outputs a stop signal, and an energization control circuit that intermittently energizes an electromagnetic clutch for transmitting rotational force of a vehicle engine to a compressor of the refrigeration cycle in accordance with the output of the microcomputer. , a braking state detecting means for generating an output when the vehicle is in a braking state, and a function of determining whether or not there is an output from the braking state detecting means in the microcomputer, and when an output is generated from the braking state detecting means. An air conditioner for an automobile, characterized in that it is further equipped with a function of generating the driving signal. 2 Utility Model Registration Scope of the Claims In the invention described in claim 1, the microcomputer has a function of calculating a heat load according to the output of a sensor that detects a physical quantity related to the heat load, and a function of calculating a refrigeration cycle based on the result of the calculation. Determine whether or not it is necessary to operate, and when it is determined that there is a need to operate, generate an intermittent operation signal at a predetermined cycle according to the heat load, and when it is determined that there is no need to operate, a stop signal is generated. An air conditioner for an automobile characterized by having a function of outputting. 3. In the invention set forth in claim 2, the microcomputer operates at the predetermined level while an output is generated from the braking state detection means of the vehicle and a driving signal that is intermittent at the predetermined period is present. An air conditioner for an automobile characterized by having a function of outputting a continuously generated driving signal instead of a periodically intermittent driving signal. 4. In any one of claims 1 to 3 of the claims for utility model registration, the braking state detection means of the vehicle is characterized by comprising means for generating an output when a brake light lighting circuit is closed. Automotive air conditioner.