JPS5845132Y2 - Blower control device for automotive air conditioners - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in automatic switching of the rotational speed of a blower, particularly in an automotive air conditioner.

BACKGROUND ART Conventionally, in controlling a blower in an automobile air conditioner, for example, the opening degree of an air mink store that adjusts the mixing ratio of cold air and warm air has been detected, and the rotation speed of the blower has been automatically adjusted based on the detection signal.

Therefore, if you operate the air conditioner in winter or in a cold region,
At the beginning of operation, the engine coolant temperature is low, and in heating mode, the air mix door opens to the maximum heating position, so the blower rotation speed is automatically set to high speed, causing a large amount of cold air to flow into the room. It had the disadvantage that air was blown to

In consideration of the above-mentioned reasons, this invention switches the rotation speed of the fan to cooling mode when the engine coolant temperature is low, rotating at a low speed, thereby preventing a large amount of cold air from being blown into the room during the initial stage of engine startup, thereby providing comfort. This provides air conditioning.

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows a block diagram of an electric circuit of a blower for an air conditioner according to the present invention.

The output signal of the opening detector 1 of the air mink store, which adjusts the air volume ratio of cold air and warm air from an air conditioner (not shown), is introduced into the mode controller 9, and the mode controller 9 is connected to the heating mode converter 6. It consists of a switch 8 that switches and controls two signals of the cooling mode converter 7, and the switch 8 is connected to the mode switch 3.
The two mode signals are outputted to the output controller 11 for the blower drive motor 12 according to the signals.

Further, the switching device 8 is configured to forcibly switch the cooling mode on or off when the detected temperature is low based on the output signal of the engine cooling water temperature detector 2.
- It is configured to switch to the mode side.

・10 is an auto/manual signal controller, which uses the signal from the above-mentioned switch 8 as an auto signal, and controls this signal and the manual signal from the manual signal generator 4 by the signal from the auto/manual switch 5. It is.

The output controller 11 is a DC output or ON-OFF
It may also include a converter that changes the signal frequency, duty ratio, etc.

FIG. 2 shows the output signal to the motor 12 of the blower control device, and the horizontal axis is the air mix door opening degree, and the direction H is the direction in which the warm air passage of the air conditioner (not shown) is opened.
The direction C is the direction in which the cold air passage is opened.

The vertical axis is the output signal E to the motor 12.

A solid line 13 is an output diagram in heating mode, and a dotted line 14 is an output diagram in cooling mode.

In both cases, the blower is set to rotate at high speed when the air mix door is opened to a wide angle, and to rotate at low speed when the opening is small.

Next, we will discuss the operation.

First, in the cooling mode, the engine cooling water is normally higher than the set value of the engine cooling water temperature detector 2, so the detector 2 does not output and is operated in the cooling mode by the signal from the mode switch 3. The motor 12 is controlled by the signal from the air mix door opening degree detector 1 in the cooling mode.

In the heating mode, a signal from the mode switch 3 switches the mode controller 9 to the heating mode, and the rotational speed of the motor 12 is controlled to match the opening degree of the air mink store in the heating mode.

However, when the engine cooling water temperature detector 2 detects that the cooling water temperature is low, such as at the beginning of engine startup, a signal is output to the mode controller 9 to switch the heating mode to the cooling mode.

Therefore, the motor 12.\ is switched from a high rotational speed signal in the heating mode to a low rotational speed signal in the cooling mode, and the motor is controlled to rotate at a low speed.

Therefore, a large amount of cold air is prevented from being introduced into the vehicle interior.

The cooling water temperature detector 2 is automatically switched to the heating mode when the engine is completely warmed up.

As described above, in the present invention, when the engine cooling water temperature detector 2 detects a low temperature, a special control circuit is required to automatically send a cooling mode signal to the blower drive motor even if it is in the heating mode. This is an extremely effective idea in practical terms as it can prevent a large amount of cold air from being introduced into the vehicle interior without having to install one, which improves the vehicle's feeling and improves safety by eliminating the need for cumbersome operations while driving. It is.

In this embodiment, the engine cooling water temperature detector has been described, but the detection can also be performed by detecting the blower motor temperature.

In this case, since the temperature detector is attached to the motor, there is an advantage that occurrence of cooling water leakage etc. can be completely prevented.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an electric circuit according to the present invention, and FIG. 2 is a diagram showing an output signal to a blower motor according to the present invention. 1: Air mix door opening detector, 2: Cooling water temperature detector, 3: Mode switch, 6: Heating mode converter, 7: Cooling mode converter, 9: Mode controller, 11: Output controller, 12: Motor, 13: Output diagram in heating mode, 14
: Output diagram in cooling mode.

Claims (1)

[Scope of utility model registration request] An air conditioner for an automobile having an air mix door that controls the proportion of cold air and warm air in the air conditioner, comprising at least an opening detection means for the air mix door and a mode switching means for switching between a cooling mode and a heating mode of the air conditioner. , heating mode conversion means and cooling mode conversion means into which the output of the air mix door opening detection means is introduced; switching means for switching the outputs of the two mode conversion means according to the output of the mode switching means; It has an output control means for sending the output of the means to a blower driving motor, and
A blower control device for an air conditioner for an automobile, characterized in that an engine cooling water temperature detection means is provided in parallel with the mode switching means, and the switching means can be switched by the engine cooling water temperature detection means.