DE2265627C2 - Ventilation for the passenger compartment of a vehicle which is provided with a ventilation, heating and / or air conditioning device - Google Patents

Description

The invention relates to a vent for the with a passenger compartment of a vehicle provided with a ventilation, heating and / or air conditioning device, in particular of a motor vehicle, the passenger compartment in its rear area with access openings for the exhaust air is provided, from which ducts lead to a ventilation device which is connected to several exhaust air openings in the dynamic pressure area of the vehicle outer skin connected 1st.

In order to obtain increased driving comfort, the aim is in automotive engineering, regardless of the Operational states of a ventilation, heating and / or air conditioning system and independent of the respective driving speeds Constantly maintaining the same air pressure in the passenger compartment, which is slightly higher should be than the highest air pressure outside of the passenger compartment for leaks. So that will prevents unhelted or uncooled air from flowing in from the outside, which is harmful to the well-being of the passengers disturbs.

To the passenger compartment one differed with! 1-chen To heat the speed of moving vehicle in such a way that it is independent of the driving speed the desired interior temperature is maintained, a must for the passenger compartment with the driving speed increasing outside air throughput can be provided. This air flow rate must be relatively large, so that the air can cool down only a little while flowing through the passenger compartment, so that the Temperatures occurring at the various red locations in the passenger compartment are only slightly different from the average the desired air temperature. In the ventilation of the passenger compartment occurs because of the high air flow and because of your own resistances, a pressure differential occurs.

If the vehicle is operated with an air conditioning system, the supply air blown into the passenger compartment is If possible, only the outside air is added, which is necessary to cover the oxygen requirements of the occupants Is. In this case of operation, therefore, the main part of the supply air consists of circulating air. Through the Venting then only a significantly small amount of air per unit of time has to be discharged to the outside, see above that there is a much smaller one in the vent

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Adjusts pressure gradient.

For this reason, the known vents are not able to operate during the two described Operating conditions to maintain the same air pressure in the passenger compartment, l ·: Γ-Λ

In both of the above-mentioned operational traps many vehicles still have a third operating case, in which made pure ventilation for the passenger compartment without heating or cooling the supply air shall be. The aim here is to achieve the highest possible throughput of outside air while the pressure is on inside the passenger compartment may be smaller than in the other operational cases, since the Ventilation is increased by outside air entering at certain leakages.

The invention is based on the object of a vent of the type mentioned at the beginning, which allows it. In at least two, but preferably in all three of the operating cases described have at least approximately the same air pressure in the passenger compartment to be observed.

The invention consists in that the exhaust air openings at a vent of the type mentioned Points of the outer skin of the vehicle are distributed at which different back pressures during the journey occur, and that the ventilation device »ventilate« depending on the selected operating conditions, "Heating" or "cooling with recirculation mode" can each be connected to one or more exhaust air openings.

As a result, the internal pressure of the passenger compartment can be kept constant throughout the world, despite the changing amount of exhaust air. It exists also the possibility of automatically venting depending on the respective operating conditions in the to bring the most appropriate position.

The arrangement of several air inlet and air passage canisters As part of a ventilation system, this is basically from DE-GM 18 97 776 known. However, the air regulating device described there does not work depending on the operating conditions »Ventilate«, »Heating« or »Cooling with recirculation mode«, so that the same Air pressure is not guaranteed even under different operating conditions. The consideration the operating conditions mentioned are not provided for in US Pat. No. 2,670,671, which is also known.

The internal pressure of a passenger compartment is one with itself different speeds moving vehicle can be approximated by the following equation be expressed.

^{P =} y T ^{+ c}

Herein means: Pi = ■ static pressure in the passenger compartment ^ j ">

- = ratio of the static pressure to the dynamic pressure at the point of the air outlet of the vent from the outer skin,

V = driving speed - ^ -,

Ice * sßc ^ Cf = constant of resistance of ventilation,

Gle = outside air throughput -zrr- flowing out of the vent,

■ jg «» ji 4 air in an air condition that is often present

From this equation it can be seen that the internal pressure In the passenger compartment with very different outside air flow rates flowing out of the ventilation can then be kept the same or at least positive if the resistance constant of the venting w and / or the ratio of the static pressure to the dynamic pressure at the point of air outlet from the Outer skin can be made very different. This can be achieved by working on several Places on the outer skin of the vehicle where very different dynamic pressures at the same driving speeds occur, exhaust air openings are attached, which correspond to the set operating status the ventilation are connected. When the exhaust vents the outer skin of the vehicle should not be changed - «can have the same effect Changing the resistance constants of the duct system of the ventilation can be achieved. Besides, it is possible to combine the two measures to achieve an optimal effect. · '-'

In practice it will suffice if at least two different settings of the ventilation are possible, since then the extreme conditions at least let it be controlled.

Claims (1)

Claim: - : Ventilation for the passenger compartment of a vehicle, in particular a motor vehicle, which is provided with a ventilation, heating and / or air conditioning device, the passenger compartment being provided with access openings for the exhaust air in its rear area. of which channels lead to a vent means "to multiple> exhaust vents is connected in the back pressure range of the vehicle outer skin, characterized in that the exhaust air apertures at locations of the outer skin of the vehicle are distributed on which different while driving dynamic pressures i ^s occur, and that the Ventilation device depending on the selected operating conditions "ventilation", "heating" or "cooling with air circulation" can each be connected to one or more exhaust air openings. ^{2 ()}