Motor vehicles – Power – Electric
Reexamination Certificate
1999-04-05
2001-04-10
Mar, Michael (Department: 3619)
Motor vehicles
Power
Electric
C123S14250R, C165S041000, C180S069600
Reexamination Certificate
active
06213233
ABSTRACT:
The invention relates to a system for cooling drive units and for heating the inner space of a hybrid vehicle. A hybrid vehicle is to be generally understood as a vehicle which comprises drive means of various nature. In particular this invention relates to a combination between a combustion machine and one or more electric motors directly coupled to drive wheels.
With a series hybrid vehicle, for example, a combustion machine or internal combustion engine is in driving connection with an electric machine which can be operated as a generator and which, in the internal combustion engine operating mode, supplies the electric drive motors with energy. In the electric operating mode on the other hand, the electric drive motors are fed by a battery. Typically, for the series hybrid vehicle, the internal combustion engine is not in mechanical drive connection with the wheels.
With a parallel hybrid vehicle, however, the combustion engine is in mechanical drive connection with the wheels as is the case with a conventional vehicle, whilst the drive in the electric operating mode is effected by the electric motors, and the combustion engine is selectively uncoupled or used for support.
Furthermore the most varied of other forms of hybrid vehicles are known, in particular mixed forms between series and parallel hybrid vehicles.
The most varied of heating means for electric or hybrid vehicles are already known. Here, in particular are those are of interest where the heating and the cooling circuit are fluidically connected to one another or where the coolant of the internal combustion engine flows through a heat exchanger.
In DE-A1 32 45 740 for example it is suggested for a hybrid omnibus to provide a fuel-operated as well as an electrically operated heating system in series into the cooling circuit of the internal combustion engine, in order, amongst other things, to keep the cooling water at a certain minimal temperature when the internal combustion engine is switched off so that a start is possible at all times under good operating conditions or favourable emission values.
For a mains-independent, battery operated hybrid vehicle the maintaining of the cooling water temperature in the electric operating mode in order to improve the start conditions of the internal combustion engine is not meaningful because the batteries would be heavily loaded and the action radius would be limited.
It is an object of the present invention to provide a combined cooling and heating system for a hybrid vehicle, where the heating circuit in the internal combustion engine operating mode may take waste heat from the internal combustion engine whilst this engine is uncoupled from the heating circuit in the electric operating mode for the purpose of saving energy.
The solution of this object of the invention is deduced from the features described herein.
The solution according to the invention makes it possible for the vehicle passenger compartment to be able to be heated via the same heat exchanger in the internal combustion engine operating mode as in the electric operating mode. In the internal combustion engine operating mode the waste heat of the internal combustion engine is used, whilst this engine is fluidically uncoupled from the heat exchanger in the electric operating mode for the purpose of reducing heat losses. By way of the very simple construction of the system according to the invention there results a particularly economical solution which can be controlled in a simple manner and which is not susceptible to breakdown.
Further advantages and advantageous formations of the invention are deduced from the further description.
REFERENCES:
patent: 4532894 (1985-08-01), Wulf et al.
patent: 5251588 (1993-10-01), Tsujii et al.
patent: 5291960 (1994-03-01), Brandenburg et al.
patent: 5345761 (1994-09-01), King et al.
patent: 5531285 (1996-07-01), Green
patent: 5950752 (1999-09-01), Lyons
patent: 32 45 740 A1 (1984-06-01), None
patent: 34 47 182 A1 (1986-06-01), None
patent: 44 31 191 C1 (1996-02-01), None
patent: 44 35 693 A1 (1996-04-01), None
Apter Robert
Sonntag Rainer
Griffin & Szipl, P.C.
Mar Michael
The Swatch Group Management Services AG
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