JPH0336686B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an air conditioner for an automobile that can quickly supply warm air into a vehicle interior during a cold start of an engine.

(Conventional example) In an automobile air conditioner, as a device for heating air, engine cooling water is guided into a heater core provided in an air conditioning case, and the cooling water exchanges heat through the heater core to generate warm air. I was getting it.

However, when the engine is cold, the cooling water temperature is also low, so naturally it cannot function as a heater, and it is necessary to wait until the engine warms up. This means that moving the vehicle in the winter is cold and painful.
There was a need for a heater that provided immediate effects.

For this reason, as a countermeasure until now,
As shown in Publication No. 127116, a device was proposed in which the cooling water was heated using a combustion heater, but it took time to warm up the cooling water, and therefore, it took time to blow out hot air. It had drawbacks.

In addition, Utility Model Application Publication No. 54-1848 proposed a device incorporating an electric heater inside the heater unit, but the electric heater generates only a small amount of heat and is sufficiently effective when the hot air is low. However, it also has the drawback of placing a large load on the battery.

(Objective of the Invention) Therefore, an object of the present invention is to provide an air conditioner for an automobile that can immediately blow out warm air even when the engine is cold.

(Means for Achieving the Object) Therefore, the gist of the present invention is to provide an auxiliary heating passage having one end opened in the air conditioning case downstream of the blower and the other end opened in the air conditioning case downstream of the heat exchanger. In an air conditioner for an automobile equipped with a combustion type auxiliary heating means, the combustion air introduction side of the combustion type auxiliary heating means is connected to the intake manifold via an intake passage, and the exhaust side is connected to the intake manifold via an exhaust passage. The reason is that the intake passage is connected to the intake manifold downstream of the connection point of the intake manifold.

(Achievement of purpose) Therefore, since the air introduced from the blower is warmed by the auxiliary heating means, warm air can be immediately blown out even when the engine is cold, and the above purpose can be achieved. be.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

In FIG. 1, an automotive air conditioner is shown,
An outside air inlet 2 and an inside air inlet 3 are formed in the most upstream side of the air conditioning case 1 in the form of two branches, and an inside/outside air switching door 4 is provided at the bifurcation point. The air to be introduced can be selected between inside air and outside air.

The blower 5 is for sucking air into the air conditioning case 1 and blowing it to the downstream side.
An evaporator 6 and a heater core 7 of a heat exchange device 8 are provided on the downstream side.

The evaporator 6 cools the introduced air, and includes a compressor, a condenser, and a condenser (not shown).
A cooling cycle is configured together with the liquid tank and the expansion valve, while the heater core 7 heats the introduced air and is inserted into a hot water cycle in which cooling water for the engine 20 is circulated.

An air mix door 9 is located in front of the heater core 7.
is provided, and this air mix door 9 is
The ratio of air passing through the heater core 7 to air not passing through the heater core 7 is determined by its opening degree, and is operated via an actuator (not shown) or the like.

Furthermore, the downstream side of the air conditioning case 1 includes an upper outlet 10, a lower outlet 11, and a defrost outlet 12.
are connected, and each opens into the passenger compartment. A mode door 13 is arranged at the branch point between the upper outlet 10 and the lower outlet 11, and
The lower air outlet 11 has a mode door 14 which should cause air to flow to the defrost air outlet 12.
are arranged. The rotation control of the blower 5, the drive control of the compressor, and the opening control of the air mix door 9 are controlled as appropriate by outputs from a control unit (not shown).

One end 15a of the auxiliary heating passage 15 opens into the air conditioning case 1 downstream of the blower 5, and a door 16 for opening and closing is provided at the connection part. Also,
The other end 15b of the auxiliary heating passage 15 is downstream of the heat exchange device 8 and is connected to the lower outlet 11 on the upstream side of the position where the defrost outlet 12 is connected. Note that the other end 15 of the auxiliary heating passage 15
The connection b may be connected upstream of the mode door 13 for switching between the upper outlet 10 and the lower outlet 11. In addition, the door 1
6, when the auxiliary heating means 17 described below is activated, it is moved as shown by the solid line, and the auxiliary heating passage 15 is opened. In the middle of the auxiliary heating passage 15, an auxiliary heating means 17 described below is arranged.

The engine 20 is a diesel engine for running, and is provided with an intake manifold 21 and an exhaust manifold 22. Air is sucked into each cylinder via an air cleaner 24 provided at the tip of the intake manifold 21, and air is sucked into each cylinder. Fuel is injected into the cylinder through the injection valve 25, the fuel explodes due to the heat generated during the compression stroke, and is output as mechanical energy through the piston and crankshaft. At this time, the generated thermal energy is cooled by the cooling water of the engine 20 and discharged to the outside of the vehicle by the radiator 26, and a part of it is sent to the heater core 7.

The auxiliary heating means 17 has a configuration as shown in FIG. 2, for example, and includes a combustion device 27 and an auxiliary heat exchanger 28, and a burner 35 such as a nozzle and a wick of the combustion device 27 is arranged in a combustion chamber 29. Fuel is in tank 3
It is configured to be pressurized and supplied from zero by a pump 31, and when supplied, it is ignited by an ignition device 32 such as an additive plug or a glow plug, and is combusted in the combustion chamber 29. The operation of the pump 31 that supplies fuel, that is, the combustion of the combustion device 27, is performed by sensing the cold start time from the engine cooling water temperature, outside air temperature, etc. ), and the combustion period, that is, the auxiliary heating means 1
The usage time 7 is continued until the engine cooling water temperature rises sufficiently and heating can be performed using hot air.
Specifically, a sensor signal that detects the engine cooling water temperature is extracted, and the drive of the pump 31 is stopped.

Note that the intake manifold 21 is connected to the combustion chamber 29 via an intake passage 33 that sucks air.
An exhaust passage 34 connected upstream and for discharging exhaust gas is connected downstream of the intake manifold 21. Therefore, the combustion chamber 29 in both passages 33, 34 is provided in parallel with the intake manifold 21, and in order to receive engine negative pressure, the combustion chamber 29 in both passages 33, 34 (intake Air is moved into the combustion chamber 29 via a bypass passage.

Further, the auxiliary heat exchanger 28 includes the combustion chamber 2
The air flowing through the auxiliary heating passage 15 is heated by the auxiliary heat exchanger 28 and flows out through the auxiliary heating passage 15.

In the above configuration, when the heater mode is set in winter and the blower 5 is rotated to use the heater, the auxiliary heating means 17 is activated when the engine cooling water temperature is low. That is, the pump 31 is driven to supply fuel, the ignition device 32 is heated, and the fuel is combusted. At this time, air for combustion is taken in from the intake manifold 21 via the intake passage 33, and exhaust gas generated during combustion is returned to the intake manifold 21 from the exhaust passage 34.

Then, the door 16 is switched, and the air introduced by the rotation of the blower 5 is flowed into the auxiliary heating passage 15 and flows into the auxiliary heat exchanger 28 of the auxiliary heating means 17, where it is heated and becomes hot air, resulting in auxiliary heating. Passage 1
5 to the air conditioning case 1, and is blown out from the lower air outlet 11 into the vehicle interior. Therefore, even when the engine cooling water level is low, the interior of the vehicle can be heated immediately by the heating operation of the auxiliary heating means 17.

Note that when the auxiliary heating means 17 is in operation, the engine is in a cold state, so that warm exhaust gas is supplied from the auxiliary heating means 17, thereby making it possible to improve the cold startability of the engine. Furthermore, although the auxiliary heating means 17 has been described as being used only during a cold start, it can also be used when the cooling water is not sufficiently warmed, such as during idling.

(Effects of the Invention) As described above, according to the present invention, since the auxiliary heating means is added to the automobile air conditioner, heating can be performed immediately even when the engine cooling water temperature is low.

Moreover, the effect of warming the engine with the warm exhaust gas from the auxiliary heating means can be expected, and cold startability can be improved.

Furthermore, when the engine is idling, the warm exhaust gas from the auxiliary heating means makes it difficult for knocking to occur, thereby stabilizing the engine.

Furthermore, the combustion chamber of the auxiliary heating means has an intake passage and an exhaust passage that are parallel to the intake manifold, and air is introduced by the action of the negative pressure of the engine, so there is no need for a blower or the like to introduce air. be.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram showing an embodiment of this invention;
The figure is a detailed view of the auxiliary heating means. 1...Air conditioning case, 5...Blower, 8...Heat exchange device, 10...Upper outlet, 11...Lower outlet,
12... Defrost outlet, 15... Auxiliary heating passage, 17... Auxiliary heating means, 21... Intake manifold, 33... Intake passage, 34... Exhaust passage.

Claims (1)

[Scope of Claims] 1. An automobile in which a combustion-type auxiliary heating means is provided in an auxiliary heating passage having one end opened in an air conditioning case downstream of the blower and the other end opened in an air conditioning case downstream of the heat exchanger. In a commercial air conditioner, the combustion air introduction side of the combustion-type auxiliary heating means is connected to the intake manifold via the intake passage, and the exhaust side is connected to the combustion air downstream of the connection point between the intake passage and the intake manifold via the exhaust passage. An automotive air conditioner characterized by being connected to an intake manifold. 2. The automobile air conditioner according to claim 1, wherein the combustion type auxiliary heating means comprises a combustion device and an auxiliary heat exchanger.