Motor vehicles – Power – Electric
Patent
1992-12-04
1994-09-06
Johnson, Brian L.
Motor vehicles
Power
Electric
318139, B60K 102, B60L 1102
Patent
active
053439716
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to the field of non-rail bound vehicles.
2. Background Information
In conventional electric vehicles, the driving power desired at a particular moment was preset by the driver via a motor control. In contrast thereto, in the vehicle according to the invention the instantaneous operating condition of the two electromotors is taken into consideration and a central control is superimposed on the motor control proper, which provides superior aspects in terms of movement dynamics, in particular drive slip prevention (in the sense of preventing considerable drive slip), brake locking prevention (when braking of the vehicle takes place by means of the electromotors now operating in the generator mode), right/left drive differential and the like. The motor control and/or the central control are continuously fed with information on the instantaneous voltage, current intensity and speed and calculate therefrom the instantaneous power and the instantaneous torque of the particular electromotor.
In conventional internal combustion electric vehicles, the drive electromotor was controlled in terms of its power by the presetting performed by the driver via a motor control. The internal combustion motor which in the end must make available the power required for generating the necessary electrical energy was varied in its speed in accordance with the power requirements of the drive electromotor. In the vehicle according to the invention, however, the respective instantaneously required current generation is effected such that the internal combustion engine is brought into an operating condition which is favourable in terms of superior aspects, in particular as regards optimized fuel consumption, optimum low pollutant emissions, high power output or the like. In concrete terms, the current generation control takes place e.g. such that the required internal combustion engine power is generated at a speed/torque combination as close as possible to the optimum point of the consumption characteristics of the internal combustion engine. The same applies analogously for the optimum pollutant emission and the optimum power output. The current generation control may be associated with the internal combustion engine only, or both with the internal combustion engine and with the current generator.
SUMMARY OF THE INVENTION
It is pointed out that the described first aspect of the invention and the described second aspect of the invention may also be realized in combined form. In this event, a central control may be provided that unites the functions of the two central controls described. Furthermore, it is expressly pointed out that, with respect to the described second aspect of the invention, it is not absolutely necessary that at least two drive electromotors are provided. The second aspect of the invention can also be realized with vehicles having only one drive electromotor and only one motor control associated with this electromotor.
The terms nominal power, nominal speed, actual power, and actual speed, as used hereinbefore, are to be understood to the effect that these contain indirectly a statement on the nominal torque and actual torque, respectively, since the applicable equation is power = torque x speed.
The vehicle according to the invention may have a drive electromotor of its own for each vehicle wheel, with a four-wheel drive vehicle being indicated as the most typical example.
In the prevention of excessive drive slip and/or brake locking prevention as described in the application, preferably all vehicle wheels coupled with an electromotor are taken into account, with the possibility that a difference may result in control of the front wheels and of the rear wheels. In the light of the described "drive differential advantageous in terms of movement dynamics" all driven vehicle wheels on the same side of the vehicle are preferably controlled substantially analogously. However, a design is also possible in which--possibly without a right/le
REFERENCES:
patent: 4363999 (1982-12-01), Preikschat
patent: 4471273 (1984-09-01), Melocik et al.
patent: 4495451 (1985-01-01), Barnard
patent: 4951769 (1990-08-01), Kawamura
patent: 4953646 (1990-09-01), Kim
Ehrhart Peter
Grundl Andreas
Heidelberg Gotz
English Peter C.
Johnson Brian L.
Magnet-Motor Gesellschaft fur Magnetmotorischetechnik mbH
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