DE102008031695A1 - Motor vehicle rear area air conditioning method, involves determining reference-air amount for rear-foot space and/or rear ventilation region depending on preset reference temperature, actual temperature and preset air distribution - Google Patents

Abstract

The method involves controlling compressors (G1, G2) and a rear-foot space flap and/or a rear ventilation flap depending on reference-air amount determined for a foot space and/or ventilation regions, for air conditioning a rear area of a vehicle. The reference-air amount for a rear-foot space and/or a rear ventilation region is determined depending on preset reference temperature, actual temperature and preset air distribution. One compressor is introduced to the rear area of the vehicle by a controller of the rear-foot space flap and/or the rear ventilation flap.

Description

The The invention relates to a method for air conditioning of Rear area of a vehicle with heating and / or air conditioning.

Currently are almost all vehicles with a heating and / or air conditioning equipped for tempering the vehicle. The simplest Embodiments, the air conditioning in dependence a desired temperature desired by the driver and a manually or automatically preset fan setting or fan power for the entire vehicle interior set.

In improved versions of heating and / or air conditioning can be customized for the driver and passenger side Set temperature to be set, whereby the temperature of the air flowing out of the air distribution flaps to the Needs of the driver and passenger are adjusted can. Possibly. can also have different total air volumes and / or air distribution wishes set individually become.

From the DE 102 54 112 A1 is already a so-called. "Four-zone automatic climate control" for a left upper, lower left, right upper and right lower passenger compartment known. Each of these four areas is assigned a control element, via which a desired heat output desired for this area can be selected without leaving the automatic mode. In addition, by means of a further control element, the total amount of air to be supplied into the vehicle interior can be preselected. Depending on the selected total air volume and the selected heat output, the automatic climate control regulates separately for each area the discharge temperature of the air and the air volume distribution by controlling the louvers on the individual air outlets. For the sake of simplicity, it can be provided that the further operating element for selecting the desired total air quantity has only a few operating positions (weak medium-strong), ie each position of the operating element activates a climate style corresponding to the desired total air quantity.

In The current BMW X5 vehicles is a corresponding automatic climate control provided with a two- or four-zone climate control. At the here designated four-zone climate control can be for the front area for the driver and passenger side and additionally for the rear area also for the drivers and Passenger side set an individual air conditioning and be executed. Here the respective user can through Actuation of a dedicated control element between the automatic programs or climate modes "soft", "medium" and "strong". Depending on the selected climate style and the preset setpoint temperature becomes the actual interior temperature adjusted by adjusting the air distribution and the amount of air. In addition, the automatic climate control fits within the respective Automatic program or climate style the specified target indoor temperature external influence by the season. Instead of an air conditioning by means of a selected automatic program can also be a manual air conditioning by appropriately preselected Parameters such as target temperature and desired air volume be made individually for each of the four zones.

Around for the front area and rear area an individual Air conditioning with different set temperatures and set air volumes To reach, is in the above heating and air conditioning in addition to the first blower, which is at the entrance the heating and air conditioning is provided, another blower available in the plant, which is specially designed for this purpose is that the requested air conditioning in the rear area, especially in the upper rear ventilation area can be achieved. Around The desired air conditioning in the rear ventilation area can be achieved depending on the desired setpoint temperature and the desired Target air volume the two fans and the rear ventilation flaps driven.

task It is an object of the invention to provide air conditioning of the rear area indicate an improved method of a motor vehicle.

These The object is achieved by a method according to claim 1. Advantageous developments emerge from the dependent Claims.

The Invention is based on a heating and / or air conditioning, in the a part of the incoming into the heating and / or air conditioning Air through a controllable first fan through Control of front air distribution flaps the front of the vehicle (especially the lower footwell and the upper ventilation area) is supplied. The air conditioning of the front area takes place here according to the known state of the art. Is it the case of System for tempering the vehicle interior by a heating and Air conditioning is additionally a cooling circuit present, which comprises at least one evaporator, the of the air conditioning air is circulated so that the air is cooled, dehumidified and then back to the required setpoint temperature can be heated.

Furthermore, the heating and / or air conditioning system comprises a further air path or air duct for the Air conditioning of the rear area. For this purpose, the initially sucked and the first blower flowing through the air is fed to a controllable second blower downstream of the first blower and then fed to the rear area of the vehicle by controlling rear footwell flaps and / or rear ventilation flaps. For the rear area controls are provided for setting a desired target temperature, a desired air flow and a desired air distribution. Possibly. can also be provided an operating element for selecting an automatic program, by the operation of the air conditioning automatically takes into account desired (preset) air conditioning parameters, such as target temperature, possibly fan power or air volume and air distribution.

to Air conditioning of the rear of the vehicle will be the first and / or second blower, as well as the rear footwell flaps and / or rear ventilation flaps in dependence one for the footwell and / or the ventilation area determined target air volume for the respective area (rear footwell and / or rear ventilation area). The desired air volume for the rear area (lower rear footwell or upper rear ventilation area) becomes dependent from a predetermined setpoint temperature, a determined actual temperature and a predetermined air distribution determined. By consideration the air distribution in the control of the for the air conditioning in the rear area necessary actuators, in particular the second fan, is it possible to achieve even better air conditioning, to the needs and wishes of the inmates is adjusted in the fund area.

advantageously, is the target amount of air for the rear footwell and / or the rear ventilation area depending on one ascertained set total air quantity for the rear area. is for the left and right rear area a separate setting possible, the target air volume for the left Rear footwell and / or left rear ventilation area depending on a target total amount of air for the left font area, and the target air volume for the right rear footwell and / or right rear ventilation area depending on a target total amount of air for determined the right font area in the vehicle. The desired air volume or the setpoint total air quantity can depend on a manual blower setting or a automatically selected air volume as part of an automatic program be determined.

In a simple advantageous embodiment of the invention Procedure is the first blower only in dependence the control variable determined for the front area of the vehicle is activated and only the second fan depending from that for the rear footwell and / or for The set air volume determined the rear ventilation area. When controlling the second blower can also takes into account the setting of the first blower because the second fan only receives so much air as is the current blower control of the first blower allowed.

alternative to this simple embodiment can depend on from the for the rear footwell and / or the rear ventilation area determined set air quantity not only the first, but also the second Blower be controlled. Is for example by sole Control of the second fan and the rear footwell flaps and / or the rear ventilation flaps the determined target air volume for the rear footwell and / or the rear ventilation area not adjustable, the fan power of depending from the manipulated variable determined for the front area raised first blower, so that more air at the second blower, thus us also at the Rear footwell flaps and / or rear ventilation flaps arrives.

Augrund of air interactions between the first and second fans, Also, the first and second blowers can do so be controlled that at different requested blower power for the first and second blower the requested first or second blower power with a positive or negative offset value is applied and analogous to the second or first blower with a reverse, that is correspondingly negative or positive offset is applied. Would, for example, due the blower power of the first blower only one low air mass flow at the inlet of the second blower arrive, in an advantageous embodiment, the blower power depending on the front area determined manipulated variable driven first blower be subjected to a positive first offset value, so that the power of the first blower is increased. At the same time, the blower output is dependent from that for the rear footwell area and / or rear ventilation area Determined desired air volume driven second blower subjected to a negative first offset value, so that the Power of the second blower is reduced. advantageously, are the first positive offset value and the first negative offset value equal in size.

Analogously, the blower output of the first blower controlled in dependence on the manipulated variable determined for the front region can be subjected to a negative second offset value and the blower output of the blower output to be dependent on the blower output For the rear footwell area and / or rear ventilation area determined target air volume driven second blower be acted upon with a positive second offset value, if the requested blower power of the first blower is greater than the requested blower power of the second blower or if at the entrance of second blower is applied too large air mass flow, which is not desired in the rear of the vehicle. Advantageously, the second positive and the second negative offset value are equal in magnitude.

The inventive method, as well as their advantageous Embodiments may be implemented by means of an implemented algorithm or a corresponding assembly arrangement in one provided control unit, in particular in an air conditioning control unit be performed.

The Invention will now be described with reference to an embodiment explained. It shows

1 a schematic representation of a heating and air conditioning system which is suitable for carrying out the method according to the invention, and 2 a simplified schematic diagram for illustrating the method according to the invention.

The 1 shows a schematic representation of a heating and air conditioning system of a vehicle for individual tempering of the front area and the rear area in the vehicle. For this purpose, the fresh air FL and / or circulating air UL flowing into the heating and air conditioning system as a function of predetermined settings via a filter F is passed to a first blower G1. Subsequently, the air flowing in through the first blower G1 at least partially flows around an evaporator V, which cools the air when the cooling function is activated. The air cooled by the evaporator is then reheated to the required temperature by a HWT heat exchanger and a PCT1 PCT auxiliary heater. By appropriate control of the ventilation flaps K in the front area, a portion of the air is directed to the various areas in the front area of the vehicle interior with a desired target temperature. At some air outlets both in the front area, as well as in the rear area are temperature sensors T, which determine the current temperature of the incoming air into the vehicle interior. This value is necessary for the climate control.

One Part of the air flowing through the evaporator V is not controlled to the ventilation flaps K in the front area, but passes through another air duct to a second fan G2 and then to the rear ventilation flaps. These and the second blower G2 are determined according to a determined Target air volume for the rear ventilation area Bel. re and Bel. li driven.

The in the rear footwell F re and F li flowing air is not in this illustration about the second blower G2 is routed directly to the rear footwell and F li supplied.

The 2 now shows a simplified schematic diagram for illustrating the method according to the invention. As known from the prior art, a manipulated variable Y is generated for the front region as a function of a desired temperature Tsoll desired by the user and the current actual temperature Tist by means of a main regulator R. In dependence on this generated manipulated variable Y, the user-set blower request GI_man and the user-set damper position KI_man, the first blower G1 and the air distribution flaps K are activated in the front region.

For The rear area of the vehicle is also dependent a user-desired setpoint temperature Tsollh and the current actual temperature Tisth by means of a main controller Rh a Manipulated variable Yf generated for the rear area. From this manipulated variable Yf for the fund area and a manually predetermined desired blower power GI_manh and a manually given desired air distribution LV for the rear section is by means of an air flow regulator R_LM is the set air volume Y_LMh for the rear ventilation area determined and control signals for driving the first fan G1, the second blower G2 and the rear ventilation flaps KBH or the rear footwell flaps, not shown here generated. In principle, the temperature of the rear area is the Weighting when setting the desired setpoint temperature and Luftvereilung on the blower power of the second blower G2 laid. Only under certain conditions will also be in the Blower control of the first blower G1 intervened. This is, for example, the case when in the front area only a small Blower power, in the rear area, however, a very high fan performance is desired. By solely controlling the second blower G2 and the rear air vents KBh could be the Desired target air volume Y_LMh Blower power then possibly not be provided, because of the low performance of the first blower G1 only very little air on the second blower G2 would arrive. In this case could be like that be intervened in the blower control of the first blower, that the performance of this first blower G1 increases slightly would become.

Alternatively, the first blower G1 can also be activated on the basis of air interactions as a function of the desired air volume Y_LMh for the rear ventilation area. For example Too low air mass flow at the entrance of the second blower G2, the blower power of depending on the determined for the front area manipulated variable Y first blower G1 can be acted upon with a positive first offset value and the fan power of the function of the rear footwell area and / or rear ventilation area determined set air quantity Y_LMh driven second blower G2 be subjected to a negative first offset value. Would arrive at the entrance of the second blower G2 augrund the blower power of the first blower G1 an excessive air mass flow, which can not be sufficiently reduced for the desired air conditioning, the blower power of the function of the determined for the frontal manipulated variable first blower G1 with a negative second offset value are applied. At the same time, the blower output of the second blower G2, which is controlled as a function of the setpoint air quantity Y_LMh determined for the rear footwell area and / or rear ventilation area, can be subjected to a positive second offset value.

through this method for air conditioning the rear area of a vehicle interior can be one taking into account one desired by the user Air volume distribution better air conditioning of the rear area done.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 10254112 A1 [0004]

Claims (10)

Method for conditioning the rear area a vehicle with a heating and / or air conditioning, with a Part of the incoming into the heating and / or air conditioning Air via a controllable first blower (G1) by controlling front air distribution flaps (K) the front of the Vehicle is supplied and another part of the in the Heating and / or air conditioning incoming air over the first blower (G1) and a first blower (G1) downstream controllable second blower (G2) by controlling rear footwell flaps and / or rear ventilation flaps (KBh) is supplied to the rear area of the vehicle, and wherein for the air conditioning of the rear area of the vehicle, the first and / or second blower (G1, G2), as well as the rear footwell flaps and / or Rear ventilation flaps (KBh) depending on one for the footwell (F re, F li) and / or the ventilation area (Bel. Re, Bel. Li) controlled target air quantity (Y_LMh) be, and where the target air volume (Y_LMh) for the rear footwell and / or rear ventilation area depending on from a predetermined setpoint temperature (Tsollh), a determined Actual temperature (Tisth) and a given air distribution (LV_manh) is determined. A method according to claim 1, that the desired air quantity (Y_LMh) for the rear footwell and / or the rear ventilation area depending on a target total amount of air for the fund area is determined. Method according to one of the preceding claims, characterized in that the desired air quantity (Y_LMh) for the rear footwell and / or rear ventilation area depending on a manual fan setting (GI_manh) or an automatically preset air quantity becomes. Method according to one of the preceding claims, characterized in that the first blower (G1) in Dependency on the determined manipulated variable (Y) is controlled for the front of the vehicle and the second blower (G2) depending on the determined desired air volume (Y_LMh) for the rear footwell and / or the rear ventilation area is controlled. Method according to one of the preceding claims, that in dependence on the determined desired air quantity (Y_LMh) for the rear footwell and / or the rear ventilation room the first and second blower (G1, G2) is driven. Method according to one of the preceding claims, characterized in that the blower power of the in Dependence on that determined for the front area Manipulated variable (Y) controlled first blower (G1) is increased, if only by driving the second Blowers (G2) and the rear footwell flaps and / or the rear ventilation baffles (KBh) the determined set air volume (Y_LMh) for the rear footwell and / or the rear ventilation area not adjustable. Method according to one of the preceding claims, characterized in that the blower power of the in Dependence on that determined for the front area Manipulated variable (Y) controlled first blower (G1) is applied with a positive first offset value and the blower power of depending on the for the rear footwell area and / or rear ventilation area determined desired air volume (Y_LMh) driven second blower (G2) is applied with a negative first offset value, if the requested blowing power of the first blower (G1) is less than the requested fan power of the second blower (G2). Method according to one of the preceding claims, characterized in that the blower power of the in Dependence on that determined for the front area Manipulated variable (Y) controlled first blower (G1) is subjected to a negative second offset value, and the blower power of depending on the for the rear footwell area and / or rear ventilation area determined desired air volume (Y_LMh) driven second blower (G2) is applied with a positive second offset value, if the requested blower output of the first blower (G1) is greater than the requested fan power of the second blower (G2). Method according to claim 7 or 8, characterized that the first positive offset value and the first negative offset value are equal in size and / or that the second positive and the second negative offset value equal in magnitude are big. Method according to claim 7, 8 or 9, characterized that the first and / or second offset value fixed or variable becomes.