Motor vehicles – Power – Electric
Patent
1992-05-29
1993-10-05
Camby, Richard M.
Motor vehicles
Power
Electric
180 654, 180 538, B60K 100
Patent
active
052496376
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a hybrid vehicle and, more particularly, to a hybrid vehicle with both an internal combustion engine and an electric motor for propulsion.
A vehicle of this type is known from DE-A 30 09 503. The hybrid vehicle described there that is operated either with a main motor designed as an electric motor, or with an auxiliary drive motor designed as an internal combustion engine, also has a second electric motor for the auxiliary units; it is connected via a first pulley to the main electric motor and via a second pulley to an internal combustion engine. The second electric motor guarantees the minimum power for the auxiliary units. However the power is delivered under normal conditions from the main electric motor or the internal combustion engine.
Other hybrid vehicles are known from DE-A 29 29 497 or EP-A 0 004 104. These hybrid autos have, in addition to the internal combustion engine, an electric motor, for which either the electric motor can be connected when better traction is desired and thus all wheel drive is produced as a starting aid, or a switch is made to exclusively electric drive when operation with the internal combustion engine is not desired, for example, for reasons of exhaust. The noise level is also greatly reduced when operating with the electric motor.
Furthermore, it is also known from DE-A 23 09 680 that the accessory drives for maintaining the power assist functions, for example the power brakes, power steering and similar operating aids are controlled via the electric motor. To do this additional V-belt belt connections are necessary; this leads to a more complicated structure. Especially in the generic designs, specifically the assignment of the internal combustion engine to the front axle, while the electric motor is assigned to the rear axle, the two power plants, i.e. the internal combustion engine and electric motor, are separated in space from one another so far that maintaining power assist functions entails considerable construction expense.
The generic DE-A 30 09 503 suggests that a second electric motor be made available to maintain the power assist functions.
SUMMARY OF THE INVENTION
The object of the invention is to provide an improved hybrid vehicle which optimally uses the components which are employed.
To do this according to the invention it is provided that the second electric motor which is used to drive the additional units during electric propulsion is driven during operation by the internal combustion engine, however it is connected as a generator to charge the batteries.
Other objects and advantages of the present invention will become more apparent to those persons having ordinary skill in the art to which the present invention pertains from the following description taken in conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a side view of the vehicle as per the invention;
FIG. 2 shows a representation of the rear axle of the vehicle as per the invention;
FIG. 3 shows the drive of the power steering pump for the vehicle as per the invention;
FIG. 4 shows a representation of the drive of the power steering pump in conjunction with the internal combustion engine;
FIGS. 5a and 5b show in schematic form the connection between the crankshaft, power steering pump and servo motor.
DETAILED DESCRIPTION
FIG. 1 shows a side view of the hybrid vehicle 10 which has an internal combustion engine 12 with a transmission 14 flanged to it in the forward engine compartment. The engine-transmission unit 12 and 14 drives the front axle 16.
On the rear axle is an electric motor 18 which is supplied with power via its own set of batteries 20. The electric motor 18 drives the rear axle 22.
The rear axle structure is shown in detail in FIG. 2. The electric motor 18, powered by batteries 20 drives the drive shafts 22 via a differential.
The corresponding mountings for the electric motor 18 are labelled 24; they suspend the electric motor 18 in a suitable manner on the frame so that it can accommodate the vibration
REFERENCES:
patent: 4042056 (1977-08-01), Horwinski
patent: 4180138 (1979-12-01), Shea
Hasler Franz
Heidl Roland
Audi AG
Camby Richard M.
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