DE19917503C2 - Method for controlling a heating and / or air conditioning system in motor vehicles - Google Patents

Description

The invention relates to a method for controlling a heating and / or air conditioning in motor vehicles according to the preamble of the patent claim 1.

Usually either heating and / or air conditioning are in motor vehicles conditions without an interior temperature sensor or heating and / or climate control installed with interior temperature sensor. The technical background becomes for example on the article "Electronic temperature control - a means to improve comfort and usability of vehicle heaters " (VDI reports No. 515, 1984, p. 161) and "Steuerungs- und Regulungssy systems for heating and air conditioning systems in motor vehicles "" (VDI reports No. 515, 1984, p. 167).

A heating system for motor vehicles is known from DE 37 31 435 A1, at which is a heating phase depending on one by a vehicle occupant Predefinable heating criterion is carried out by the setting an operating element is selected in the form of a switching device.

The invention relates to the cheaper heating and / or air conditioning systems in the form of interior temperature controls, i.e. without interior room temperature sensor and thus without interior temperature control. at Such heating and / or air conditioning systems are controls such. B.  Temperature rotary switch, fan rotary switch, air distribution setting switch and / or air conditioning on / off switch, provided in the vehicle interior. Such a heating and / or air conditioning system, usually with a electronic control unit, controls only dependent speed of these controls and possibly depending on the operating pa parameters such as B. the outside temperature and the cooling water temperature, the the controls assigned actuators, such as. B. the heat rope shear flap for the blow-out temperature, the blower for the air volume and / or the flaps for setting the air outlet locations. It takes place at least a regulation to a constant discharge temperature or a con constant heat exchanger temperature instead, but not an actual interior room temperature control.

An increased heating or cooling capacity requirement with a so-called cold start, d. H. at an engine start after the vehicle for has not been used for a long time. To fundamentally desired values to be set via the control elements if possible Getting quickly is after a cold start, especially at very high ones or very low outside temperature, a short-term intervention by the driver witness occupants in the form of a manual heating or Cooling down necessary. Usually z. B. at cold outside temperatures maximum temperature next to the corresponding control element until the vehicle appears warmed up. Only then will you get to the bottom additionally set the desired temperature. The opposite is true Behavior of the vehicle occupant at particularly high outside temperatures. This leads to a not inconsiderable loss of comfort compared to the interior regulated heating and air conditioning systems.

It is an object of the invention ge a heating and air conditioning control named type to improve in terms of comfort.  

This object is achieved by the features of patent claim 1. Advantageous further developments are the subjects of the subclaims.

According to the invention after a cold start of the internal combustion engine depending on the setting of the controls, a pre-specified level heating or cooling phase depending on the current outdoor temperature carried out. The automatic heating phase is advantageous only at an outside temperature below a predetermined first Threshold values, e.g. B. 10 ° C initiated. Automatic Ab cooling phase only when the outside temperature is above a specified one second threshold, e.g. B. 25 ° C initiated.

The automatic heating or cooling phase is for example for one predetermined period of time. Additionally or alternatively, the Determine the automatic heating or cooling phase empirically accordingly ter, stored in the control unit control characteristics controlled by guided.

Depending on Be present in the control unit as input signals drive parameters, e.g. B. cooling water temperature of the internal combustion engine and Outside temperature, it is recognized whether a cold start of the engine before and if necessary whether a heating or cooling phase should be initiated. For this are usually already necessary for other control systems Tempe temperature sensors.

For example, a heating phase can be carried out in such a way that for a predetermined first period of time the windows are defrosted and for a predetermined further period of time the footwell as quickly as possible is heated. Regardless of the current setting of the  Controls the air volume via the blower control, the blow-out temperature via the heat exchanger controller and / or the air outlet location via the corresponding flaps are adjusted. The course of the blown out temperature according to a control characteristic or a fixed predetermined height the blow-out temperature during the heating or cooling phase preferably specified as a function of the outside temperature.

For example, if only the blow-out temperature is changed, the blow-out can temperature itself or the time span of its adjustment depending on the fan speed just set can be specified. example meadow the longer the fan speed, the longer the time.

The control unit for carrying out the method according to the invention detects preferably a manual setting of the controls the vehicle occupants during the automatic heating or Cooling phase. In this case the automatic control of the heating or cooling phase disabled because then the wish of the Vehicle occupants are expected to perform a manual intervention.

This invention has the advantage that the vehicle occupant at one fold actuation of a heating and / or air conditioning system without interior temperature temperature sensors in the heating and cooling phase almost the same comfort as with a higher-quality heating and climate control.

Claims (7)

1. A method for controlling a heating and / or air conditioning system in motor vehicles without interior temperature sensor with controls in the vehicle interior and with an electronic control unit, characterized in that after a cold start of the internal combustion engine, regardless of the setting of the control elements depending on the current outside temperature a predetermined heating or cooling phase is carried out automatically. 2. The method according to claim 1, characterized records that the automatic heating phase only at an outside temperature below a predetermined first threshold is initiated. 3. The method according to claim 1 or 2, characterized characterized that the automatic cooling phase only at an outside temperature above a given the second threshold is initiated. 4. The method according to any one of claims 1 to 3, characterized in that the automatic on heating or cooling phase for a predetermined period of time  is carried out. 5. The method according to any one of claims 1 to 4, characterized in that the automatic on heating or cooling phase empirically determined accordingly telter, control code stored in the control unit lines controlled. 6. The method according to any one of claims 1 to 5, characterized in that depending on the tax unit available as input signals parameters (e.g. cooling water temperature of the internal combustion engine machine, outside temperature) is recognized whether a cold start of the internal combustion engine is present and, if applicable, whether a Heating or cooling phase is to be initiated. 7. The method according to any one of claims 1 to 6, characterized in that the automatic on heating or cooling phase is interrupted when wah during the automatic heating or cooling phase a manual setting of the controls is provided is taken.