Heat exchange – With vehicle feature – Heating and cooling
Patent
1993-08-11
1998-03-10
Ford, John K.
Heat exchange
With vehicle feature
Heating and cooling
165 43, 165248, 165236, 165 54, 62244, 62 95, 62325, 237 123R, 237 123A, 237 123B, F25B 2900
Patent
active
057250480
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a process for cooling drive components and for heating a passenger compartment of a motor vehicle, especially of an electrically driven vehicle, and a device for implementing the process.
Hitherto conventional motor vehicles possess a combustion engine in which a large quantity of the supplied energy is converted into heat, which is discharged as dissipated heat in a radiator to the ambient air. The quantity of heat which is available after a warm-up phase of the internal combustion engine is greater than the energy requirement which is required even on cold winter days for the vehicle heating.
Alternative drive concepts have however already been proposed using an electric motor, for example, the energy for which is supplied from a battery unit. In drive systems of this kind also, a certain dissipated heat is generated in the drive motor, in the transmission, in the power control, in the battery unit and, where appropriate, in further components. This dissipated heat is by no means sufficient, in terms of heat quantity, for a heating operation of the passenger compartment, especially under low external temperatures.
For the cooling of the drive components, it has already been proposed to provide corresponding cooling ducts for a liquid coolant, so that the coolant is able to flow through all heat-generating components and draws off the heat energy from the said components. In the arrangement known from DE-GM 90 01 590, the heat is discharged from a cooler or from a heat exchanger disposed in the inlet duct to an air current. The cabin air is circulated, a part-current being discharged to the ambient air and fresh air being supplied.
The object of the present invention is to provide a process for cooling drive components and for heating a passenger compartment of a motor vehicle, in which the best possible exergetic use is made of the available energy sources and the cooling of the drive components is herewith assured in combination with improved heat recovery, all possible climatic conditions being taken into account. The object of the invention is additionally to provide a device for the implementation of this process.
Based upon a process of the generic type defined in the preamble of Claim 1, the said object is achieved according to the invention by the characterizing features of Claim 1.
The essential advantage consists here in the fact that the heat of the air located in the passenger compartment is sensibly recovered, so that only an unavoidable heat loss has to be re-compensated by the heat sources present in the vehicle.
The above-stated object in relation to the creation of a device for cooling a drive motor and for heating a passenger compartment of a vehicle, of the generic type defined in the preamble of Claim 5, is achieved according to the invention by the characterizing features of Claim 5.
The essential advantage of this device consists in the fact that, by virtue of the control elements and the blower, an adequate cool-air current is constantly provided by the heat exchanger, whereas the heat energy drawn off from the heat exchanger and also the heat energy contained in the recirculated-air current of the air-guide duct is purposefully supplied, only where necessary and according to the required heat quantity, to the passenger compartment.
A more simply designed device in terms of the necessary system parts consists in a further heat exchanger being provided, which can be flowed through by the coolant and is disposed in an exhaust-air duct, commencing at a second waste-air opening, of the passenger compartment and in there being provided between the second waste-air opening and the heat exchanger an inflow control element into which a cool-air duct emerges.
To the cooling circuit there can be connected further heat-generating auxiliary units and, for the circulation of the coolant, a coolant pump is provided which is driven by an electric motor. In order to achieve an optimal design of the heat exchanger, it is expedient for the cooling liquid to be conducted to th
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Burk Roland
Heckenberger Thomas
Krauss Hans-Joachim
Loehle Michael
Behr GmbH & Co.
Ford John K.
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