JPS6241137B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air conditioner for a vehicle, and in particular to a vehicle running speed and compressor drive.

Conventionally, a compressor constituting a vehicle air conditioner is driven on and off within a range that does not freeze the cooler, and is driven independently of the traveling speed of the vehicle. Therefore, when a vehicle runs in a city, the vehicle repeatedly accelerates, decelerates, and stops as shown in Figure 1a.In this case, the compressor is driven regardless of the vehicle speed as shown in Figure 1b, so the vehicle The system is sometimes turned on when accelerating and turned off when decelerating, which deteriorates energy efficiency and puts an unreasonable burden on the engine, making it impossible to achieve fuel efficiency.

The purpose of the present invention is to reduce the load on the engine by driving the compressor when the vehicle is decelerating, thereby realizing fuel savings, and to reduce the operating rate of the compressor at a constant running speed, thereby saving power. This will be explained in detail below using examples.

FIG. 2 is a simplified configuration diagram showing an embodiment of the vehicle air conditioner according to the present invention.
is an engine intake pipe having a fuel adjustment butterfly 2, to which air mixed with fuel is supplied. A thin tube 3 communicates with a portion of the intake pipe 1, and a pressure detector 4 is provided at the end of the thin tube 3.
The pressure detector 4 is located between an airtight chamber 5 communicating with the capillary tube 3 and an airtight chamber 7 having a pore 6, and includes a diaphragm ₈₁ which is always given the habit of moving in the direction of the airtight chamber 7 by a spring 8. An actuating rod 9 protruding from the airtight chamber 7 is fixed to the diaphragm ₈₁ , and a movable contact 10 extending perpendicularly to the actuating rod 9 is fixed to the tip of the actuating rod 9. Fixed contacts 11 and 12 are located in the moving range. The fixed contacts 11 and 12 extend in a direction parallel to the actuating rod 9, and the fixed contact 11 and the fixed contact 12
It protrudes further toward the tip of the actuating rod 9. Now, when the movable contact 10 moves in the direction of the fixed contacts 11 and 12, the movable contact 10 first comes into contact with the fixed contact 11 and moves (solid line position shown in the figure), then moves to the position shown by the broken line b, and both contacts 11 , 12.
That is, at position a, the movable contact 10 is connected to the fixed contact 1.
At position b, both contacts 11 and 12 are turned on. Also, the movable contact 10 moves in the opposite direction,
When it reaches the position of broken line c, both contacts 11 and 12 are turned off. A power source 14 is connected to the movable contact 10 via a cooling operation switch 13, and a control switch 15 is connected to the fixed contact 11.
An electromagnetic clutch 17 for driving an idling up circuit 16 and a compressor 18 is connected to the control switch 15. Further, the fixed contact 12 is connected to an electromagnetic clutch 17 and an idling up circuit 16 via a timer 19.

The control switch 15 is a temperature switch that detects the temperature of a cooler driven by a compressor and turns off when this temperature reaches the freezing temperature, or it detects the refrigerant pressure in the cooling cycle and sets the refrigerant pressure to a predetermined level. It consists of a pressure switch that turns off when the pressure drops to a certain level. This control switch 1
5, the compressor 18 is normally on/off controlled.

Further, the idling up circuit 16 includes, for example, a solenoid valve for adjusting air pressure, and is comprised of a mechanism that allows the accelerator to be adjusted by the air pressure from this solenoid valve.

The operation of the vehicle air conditioner with the above configuration will be explained using the characteristic diagrams shown in _FIGS . Contact 10
is turned on with respect to the fixed contact 11, and power input is supplied to the idling up circuit 16 and the electromagnetic clutch 17 via the control switch 15. As a result, the electromagnetic clutch 17 is turned on and off based on the operation of the control switch 15.
The compressor 18 is driven on and off. Since the idling up circuit 16 is activated in synchronization with the turning on of the compressor 18 and increases the idling of the engine, it is possible to automatically compensate for the decrease in engine speed due to the compressor driving.

Next, when the vehicle decelerates, the butterfly 2 that is linked to the accelerator rotates in a direction that blocks the intake pipe 1, thereby increasing the air pressure inside the thin tube 3 in the negative direction, so that the diaphragm ₈₁ resists the spring 8. As the actuating rod 9 moves accordingly, the movable contact 10 moves to the position b, whereby the movable contact 10 turns on the fixed contacts 11 and 12. As a result, the control switch 15 is short-circuited, and the idle up circuit 16 and the electromagnetic clutch 17 are directly supplied with power input regardless of the operation of the control switch 15, so that the compressor 1
8 is always on while the vehicle is decelerating. However, if the deceleration continues for a long time and the compressor 18 continues to be turned on, such as when going down a long slope, the timer 19
is activated to open the circuit of contact 12, so the cooler will not freeze abnormally.

Next, when the vehicle accelerates, Butterfly 2
opens, the movable contact 10 moves in the opposite direction to the above, and at position c, the movable contact 10 is turned off with respect to both fixed contacts 11 and 12, so that the power supply for the idling up circuit 16 and the electromagnetic clutch 17 is Input is completely cut off. At this time, by making the pores 6 provided in the airtight chamber 7 sufficiently small, the position of the diaphragm 8 is prevented from hunting during the gear change.

As is clear from the above explanation, the compressor is turned off when the vehicle accelerates, and turned on when it decelerates.
Since the compressor is turned on and off depending on the temperature of the cooler or the refrigerant pressure while the vehicle is running at a constant speed, acceleration can be performed quickly without putting an undue burden on the engine during acceleration. In addition, by turning on the compressor during deceleration, the energy during deceleration of the vehicle can be used effectively, resulting in fuel savings and braking effect. The compressor can be driven for a sufficient period of time until it is turned off by timer 19 regardless of the pressure of It is advantageous in terms of power saving because it is possible to increase the off-state ratio and reduce the operating rate. Furthermore, since the idling up circuit 16 is driven in synchronization with the compressor 18, it is possible to compensate for the decrease in engine speed caused by the turning on of the compressor 18.

FIG. 4 is a circuit diagram showing another embodiment of the vehicle air conditioner according to the present invention, and the same parts as in FIG. 2 are designated by the same reference numerals. In this case, the contact 12 is made up of a long contact 12 ₂ and a short contact 12 ₁ , and the tips of the contacts 12 ₂ and 12 ₁ are aligned, and when the vehicle is stopped and is in an idling state, the movable contact 10 is connected to b ₁ . When the movable contact 10 slides to the position _b2 , the contacts 121 _{and 2} are turned on, and when the vehicle decelerates and slides to the position _b2 , the contact ₁₂₂ is turned on and the contact ₁₂₁ is turned off. Configure it as follows. The contact ₁₂₂ is connected to the electromagnetic clutch 17, the contact ₁₂₁ is connected to the idling up circuit 16, and the contact 11 is connected to the idling up circuit 1 through the control switch 15.
6 and an electromagnetic clutch 17. Note that diodes 20 and 2 are connected to the idling up circuit 16 side and the electromagnetic clutch 17 side of the control switch 15.
0 is inserted.

According to the above configuration, when the vehicle is stopped (idling), the movable contact 10 moves from the position a and both contacts 12 ₁ and 12 ₂ are turned on, so that the idling is turned up as the compressor 18 is driven. . However, when decelerating, the movable contact 10 is the contact 1.
Since it is turned on only in ₂₂ , the idling will not be increased even if the compressor 18 is driven.
It is possible to prevent it from becoming difficult to decelerate due to the idling being increased during deceleration.

Note that the control switch 15 is not limited to being composed of a sensor that detects the temperature of the cooler, but may be composed of a switch that detects cold air blowing through the cooler and controls the compressor.

Although the control switch 15 has been described as being short-circuited between the contacts 10 and 12 during deceleration, the control switch may be a normally closed switch.

As explained above, according to the present invention, when the temperature of the cooler or downstream of the cooler reaches the temperature just before freezing, or when the pressure of the refrigerant circulating through the cooler reaches the refrigerant pressure just before freezing, the compressor The air conditioner for a vehicle is equipped with a control switch that turns off the switch, and includes a detection means for detecting at least a deceleration state of the vehicle, and based on the detection means, the control switch is short-circuited or normally closed during deceleration. In addition, a timer is installed to restore the short-circuit or normally closed operation of the control switch after a certain period of time after deceleration is detected, so the wasted energy during deceleration can be used to drive the compressor, resulting in lower fuel consumption and power savings. In addition, if the deceleration state continues for a long time, such as when going down a long slope, a timer will be activated, thereby preventing inconveniences when the cooler freezes. In addition, since the compressor is turned off during acceleration, the load on the engine can be reduced, and since an idling up circuit is provided, it is possible to prevent the engine speed from decreasing due to the compressor being turned on. By configuring it to operate only in this case, there is an effect that deceleration operation can be performed satisfactorily.

[Brief explanation of the drawing]

1a and 1b are characteristic diagrams for explaining the operation of a conventional vehicle air conditioner, and FIG. 2 is a circuit diagram showing an embodiment of the vehicle air conditioner according to the present invention.
3a and 3b are diagrams of its operating characteristics, and FIG. 4 is a circuit diagram showing another embodiment of the vehicle air conditioner according to the present invention. 1... Intake pipe, 4... Pressure detector, 9... Operating rod, 10... Movable contact, 11, 12... Fixed contact, 15... Control switch, 16... Idling up circuit, 17... Electromagnetic Kuratsuchi, 18...
Compressa.

Claims (1)

[Claims] 1. Control the compressor to turn off when the temperature of the cooler or downstream of the cooler reaches a temperature just before freezing, or when the pressure of the refrigerant circulating through the cooler reaches the refrigerant pressure just before freezing. The vehicle air conditioner is equipped with a detection means for detecting at least a deceleration state of the vehicle, and based on the detection means, the control switch is short-circuited or normally closed during deceleration, and the control switch is also configured to detect deceleration. An air conditioner for a vehicle, characterized in that a timer is provided for restoring the short circuit or normally closed operation of the control switch after a predetermined period of time. 2. Equipped with a control switch that turns off the compressor when the temperature of the cooler or downstream of the cooler reaches a temperature just before freezing, or when the pressure of the refrigerant circulating through the cooler reaches the refrigerant pressure just before freezing. The air conditioner for a vehicle is provided with a detection means for detecting deceleration and stoppage of the vehicle, and based on the detection means, the control switch is short-circuited or normally closed during deceleration and stoppage, and the control switch is set to short-circuit or normally closed when the vehicle is decelerated and stopped. An air conditioner for a vehicle, characterized in that it is provided with a timer for restoring the short circuit or normally closed operation of the control switch after a certain period of time, and an idling up circuit that turns up the idling of the engine only when the vehicle is stopped.