JPS632804B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vehicle air conditioner, and more particularly to level setting of a thermostat that detects the temperature of a cooler and adjusts the operating level of a compressor.

Conventionally, vehicle air conditioners are equipped with a thermostat that detects the temperature of the cooler directly or indirectly using a temperature sensor and turns off the compressor when the cooler reaches the point of freezing to prevent freezing. However, according to this method, even when the outside and inside temperatures are low and cooling is not required much, the compressor is driven to just before the freezing temperature of the cooler, which is disadvantageous in terms of power saving.

Therefore, if the room temperature setting section has recently been adjusted to raise the vehicle room temperature, the temperature level of the thermostat is adjusted and the operating level M at which the compressor is turned off is changed as shown in Figure 1. This is reducing the operating rate. In the figure, the horizontal axis shows the setting state of the room temperature setting, and the vertical axis shows the temperature of the cooler.As is clear from the figure, as the room temperature setting section is set to the high temperature side, the operating level M of the compressor changes. The temperature is adjusted to the high temperature side, and as a result, the compressor is turned off even if the temperature of the cooler does not drop significantly, thereby saving power.
In this case, as the room temperature setting section is set to the high temperature side, the air mixer door starts to open gradually in conjunction with the room temperature setting section from an intermediate position between the low temperature side and the high temperature side, and cold air from the cooler side is supplied to the heater core side. Eventually, all the air from the cooler side will be supplied to the heater side. However,
The operating level M of the compressor is saturated at a predetermined temperature level approximately starting from an intermediate position where the air mixer door is opened and the proportion of warm air is increased. Therefore, within this saturation range, the operating rate of the compressor remains constant at a small value.

However, if the operating rate of the compressor is reduced in this way on the high temperature side, if the compressor operation switch is operated to dehumidify the window glass in defrost mode and the compressor is driven, the compressor will not operate at the required amount, making it difficult to dehumidify sufficiently. This causes the inconvenience of not being able to do so.

An object of the present invention is to increase the operating rate of the compressor starting from the position where the air mixer door begins to open based on the operation of the room temperature setting section, and will be described in detail below using examples.

FIG. 2 is a characteristic diagram for explaining one embodiment of the vehicle air conditioner according to the present invention, and FIG. 3 shows an adjustment panel of the vehicle air conditioner, in which 1 is a mode setting adjustment lever; 2 is a room temperature setting adjustment lever that constitutes the room temperature setting section 10; 3 is an inside/outside air switching adjustment lever; 4 is a blower rotation speed adjustment lever;
Reference numeral 5 indicates a compressor operation switch, and when the adjustment lever 4 is set to the OFF position, all functions of the air conditioner can be stopped.
is set to a location other than OFF, and switch 5
When turned on, power can be supplied to the compressor via the thermostat that detects the temperature of the cooler.

As shown in FIG. 4, the cooler thermostat 9 compares the signal from the temperature sensor 6 that detects the temperature of the cooler with a reference signal 7, and determines when the temperature of the cooler reaches a predetermined comparison temperature level T. It has the function of turning off the output contact 8 when the voltage drops, and this contact 8 controls the electromagnetic clutch for driving the compressor.
In this embodiment, as the adjustment lever 2 of the room temperature setting unit 10 is adjusted from the low temperature side to the high temperature side as shown in FIG. The comparative temperature level T of the thermostat is increased to increase the rate at which the compressor is turned off, and from the intermediate position where the air mixer door begins to open, the comparative temperature level T of the thermostat is gradually decreased in inverse proportion to the opening degree of the air mixer door which gradually increases. to reduce the rate at which the compressor is turned off. Incidentally, such an operation is performed by an adjusting means that changes the reference signal 7 in conjunction with the adjusting lever 2 to adjust the comparative temperature level T. This adjustment means is, for example, a variable resistor, one terminal of which is connected to the intermediate point of the resistor, and the other terminal of which is connected to a contact that moves from one end of the resistor to the other end in conjunction with the adjustment lever 2. This can be easily realized by As a result, the operating level M of the compressor becomes as shown in FIG.
Even when the temperature is set to the high temperature side, by turning on the switch 5, the cooler is driven until the temperature of the cooler becomes sufficiently low. Therefore, by turning on the dehumidification switch 5, it becomes possible to blow out the required amount of cold air, and sufficient dehumidification can be performed even when the temperature is set. In addition, when setting the air mix door from the middle position where it starts to open to the high temperature side, the compressor operating rate increases continuously and gradually, so cold air is suddenly blown out, damaging the passenger's feeling and impairing power savings. It never happens.

As explained above, according to the present invention, there is provided an air mix door that adjusts the mixing ratio of cold air from the cooler and warm air from the heater, and an air mix door that adjusts the mixing ratio of cold air from the cooler and warm air from the heater, and an air mix door that adjusts the mixing ratio of cold air from the cooler and warm air from the heater. a room temperature setting unit that starts opening the compressor and gradually increases the proportion of warm air; a thermostat that detects the temperature of the cooler and turns off the compressor when the temperature drops to a predetermined comparison temperature level; and adjustment means for adjusting the comparison temperature level of the thermostat in conjunction with the room temperature setting section, and the adjustment means adjusts the comparison temperature level of the thermostat while the room temperature setting section is set from the low temperature side to the intermediate position. The temperature level is gradually increased, and while the room temperature setting section is set from the intermediate position to the high temperature side, the comparison temperature level of the thermostat is gradually decreased in inverse proportion to the air mix door opening degree, so that the occupant's feeling and It becomes possible to perform sufficient dehumidification without impairing power saving.

[Brief explanation of the drawing]

FIG. 1 is a characteristic diagram showing an example of a conventional vehicle air conditioner, FIGS. 2 and 3 are characteristic diagrams and a configuration diagram showing an example of a vehicle air conditioner according to the present invention, and FIG. 4 is a characteristic diagram showing an example of a conventional vehicle air conditioner. FIG. 3 is a block diagram showing the main parts thereof. 1...Mode setting adjustment lever, 2...Room temperature setting adjustment lever, 3...Inside/outside air switching adjustment lever, 4...
...Blower rotation speed adjustment lever, 5...Compressor operation switch, 9...Thermostat, 10...
Room temperature setting section.

Claims (1)

[Claims] 1. An air mix door that adjusts the mixing ratio of cold air from the cooler and warm air from the heater, and when setting the room temperature from a low temperature side to a high temperature side, the air mix door starts opening from an intermediate position between them and the warm air ratio gradually increases. a room temperature setting unit that detects the temperature of the cooler and turns off the compressor when the temperature drops to a predetermined comparison temperature level; and a thermostat that operates in conjunction with the room temperature setting unit and adjusting means for adjusting the comparative temperature level of the thermostat, and the adjusting means gradually increases the comparative temperature level of the thermostat while the room temperature setting section is set from the low temperature side to the intermediate position. An air conditioner for a vehicle, wherein the comparative temperature level of the thermostat is gradually lowered in inverse proportion to the opening degree of the air mix door while the thermostat is set from the intermediate position to the high temperature side.