JPS62972Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an air conditioner for an automobile, particularly to control of a variable capacity compressor during braking.

BACKGROUND ART In automotive air conditioners, techniques have been implemented to control the capacity of a compressor depending on at least the interior temperature of the vehicle and a set temperature. This technology is
For example, this is known from British Patent No. 1587111, and has the advantage of saving power compared to the conventional compressor that always discharges at maximum capacity.

When a car is running, the kinetic energy of the car is dissipated by the brakes when the brakes are applied. In other words, kinetic energy is wasted, and the purpose is to effectively utilize this kinetic energy to drive a variable capacity compressor to save power.The gist of this is as follows:
A calculating means 31 that calculates a basic control value that determines the capacity of the compressor according to at least the inside temperature obtained from the inside temperature detector 16 and the set temperature obtained from the temperature setting device 18, and a brake detection unit that detects the on/off state of the brake. 15 and a control value of the calculation means for calculating the basic control value to determine whether the compressor capacity is zero or any other case, and to determine whether or not the brake is on from the brake detector. means 33 and this determining means 3
3, a correction means 34 corrects the basic control value of the calculation means 31 so that the compressor capacity is not zero and the compressor capacity is maximized when the brake is on; and a control value corrected by the correction means 34. Based on this, the compressor capacity variable means 32 is provided with a control means 35 for controlling the adjustment amount of the compressor capacity variable means 32.

Therefore, when the compressor is in operation when the vehicle is moving, when the brake is applied, the discharge capacity of the compressor is increased to the maximum, increasing the amount of work of the compressor, thereby applying a load and saving power. It is possible.

Examples of this invention will be described below with reference to the drawings.

In FIG. 2, an embodiment of this invention is shown,
The automobile air conditioner sucks inside air or outside air from the most upstream side of an air conditioning case 1 by driving a blower 2,
An evaporator 3 and a heater core 4 are provided on the downstream side of the blower 2.

The evaporator 3 constitutes a cooling cycle together with a compressor 5, a condenser 6, a liquid tank 7, and an expansion valve 8, while the heater core 4 is inserted into a hot water cycle in which engine cooling water is circulated. The rotation of the engine is transmitted to the compressor 5 via an electromagnetic clutch 9, and the discharge passage 10a and suction passage 10b of the compressor 5 are short-circuited with a solenoid valve 11 in between. When the valve 11 is closed, all the refrigerant flows into the cooling cycle, but when the solenoid valve 11 is opened, a portion of the discharged refrigerant is returned to the suction side, resulting in a low capacity, and the capacity shown in FIG. This constitutes a variable means 32.

In addition to this embodiment, the capacity variable means 32 may be configured to change the number of cylinders of the compressor 5 or change the pulley ratio of the belt transmission device.

In front of the heater core 4, there is an air mix door 1.
The air mix door 12 adjusts the ratio of air passing through the heater core 4 to air not passing through the heater core 4, and is operated by an actuator 13.

Although not shown, the downstream side of the air conditioning case 1 is connected to an upper outlet, a lower outlet, and a defrost outlet.

The microcomputer 14 is a central processing unit.
CPU, memory ROM that stores program procedures and fixed data, memory that can read and write data
It is equipped with RAM, input/output device I/O, and timer.

The microcomputer 14 receives input from a brake detector 15 that detects the depression of the brake, as well as inputs the inside temperature from the inside temperature sensor 16, outside temperature from the outside temperature sensor 17, and settings from the temperature setting device 18. Each temperature is detected, and the signals of the inside air temperature, outside air temperature, and set temperature are selectively taken in by the multiplexer 19, converted into digital signals by the A/D converter 20, and sent to the microcomputer 14. is input. In addition, this microcomputer 14 includes:
Although not shown, turning on operation switches such as fan switch, mode switch, air conditioner switch, etc.
Off signal is input.

The microcomputer 14 includes a blower drive circuit 21 which calculates the above-mentioned input signals according to a predetermined program and determines the rotation speed of the blower 2;
An electromagnetic clutch drive circuit 22 for driving the electromagnetic clutch 9 of the compressor 5, a compressor capacity drive circuit 23 for controlling the capacity of the compressor 5,
A control signal is sent to the air mix door drive circuit 24 that controls the air mix door 12, and changes the speed of the blower 2, disconnects and disconnects the electromagnetic clutch 9, controls the discharge volume of the compressor 5, positions the air mix door 12, and also controls the mode controlled by the mode door (not shown). It is now automatically controlled as appropriate.

In FIG. 3, the microcomputer 1
An example of the control operation according to No. 4 is shown as a flowchart, and the operation will be explained according to this flowchart.

In the same figure, calculation is started at a start step 51, at least the inside temperature Tr and set temperature Td are read at the next step 52, outside temperature Ta, solar radiation Ts, etc. are added as necessary, and then the calculation is performed at step 53.
Then, the basic control value for the capacity of the compressor is calculated. Here, the capacity of the compressor is controlled in stages from maximum to minimum depending on the vehicle interior temperature, set temperature, etc., but in this embodiment, the maximum capacity is 4/4, 3/4, 2/4, minimum Control of 1/4 and zero 0/4 is performed.

At step 54, it is determined whether or not the compressor capacity is zero, that is, the compressor 5 is stopped. If the compressor capacity is zero 0/4,
Proceeding to step 55, the compressor 5 maintains the normal control performed depending on at least the vehicle interior temperature Tr and the set temperature Td, that is, the capacity zero 0/4 state.

At step 54, the compressor capacity is zero/
In cases other than 4, that is, the compressor 5 is operated,
If there is a discharge capacity, the process proceeds to the next step 56.

In step 56, a brake signal is received from the brake detector 15, and the process proceeds to the next step 57, where it is determined whether or not the brake is operating.

At step 57, if the brake is not operating, the compressor 5 is under normal control, and if the brake is operating, the process advances to the next step 58, where an instruction is issued to maximize the compressor capacity. The compressor 5 is therefore operated at maximum capacity.

The maximum capacity operation of the compressor 5 occurs during braking, and the time is specified and determined by the timer in steps 59, 60, 61 and 65. When a certain period of time (for example, several seconds to several minutes) has elapsed, the process proceeds to timer stop step 61, and the maximum compressor capacity operation is stopped. Then, in the next step 62, the compressor shifts to normal control whose capacity is determined by at least the vehicle interior temperature and the set temperature.

Further, in step 63, it is determined whether or not the brake is still operating, and even if the brake is still operating, the compressor capacity continues to be normally controlled, so as not to immediately return to the start after the timer has stopped. This is to prevent insufficient cooling. When the brake operation is released in step 63, the process returns to the start.

When the brake is released during maximum capacity control of the compressor, this state is determined in step 64, and the process proceeds to step 65, where the timer is stopped and the capacity control of the compressor becomes normal control. It is.

As described above, according to this invention, in a device with variable compressor capacity, the compressor capacity is maximized during braking, and the kinetic energy of the vehicle is effectively used to reduce the operating energy of the compressor, thereby saving power. It is possible to aim for

In addition, the brakes become more effective due to the increased load caused by the operation of the compressor, which has the effect of reducing the force required to press the brakes and reducing wear on the brake pads.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of this invention, FIG. 2 is a block diagram of an embodiment of this invention, and FIG. 3 is a flowchart of this invention. 5...Compressor, 15...Brake detector, 16...In-vehicle temperature detector, 18...Temperature setter, 31...Calculating means for calculating basic control values, 3
2... Compressor capacity variable control means, 33...
Judgment means, 34...correction means, 35...control means.

Claims (1)

[Scope of utility model registration request] a calculation means that calculates a basic control value that determines the capacity of the compressor according to at least the inside temperature obtained from the inside temperature detector and the set temperature obtained from the temperature setting device; and a brake detector that detects the on/off state of the brake; Judgment means for judging whether the compressor capacity is zero or in other cases based on the control value of the calculation means for calculating the basic control value, and judgment means for judging whether the brake is on from the brake detector, and this judgment. correction means for correcting the basic control value of the calculation means so that the capacity of the compressor is not zero and the capacity of the compressor is maximized when the brake is on, based on the control value corrected by the correction means; 1. A control device for an air conditioner for an automobile, comprising: a control means for controlling the amount of adjustment of the compressor capacity variable means.