Motor vehicles – Power – Electric
Patent
1998-04-29
2000-08-08
Johnson, Brian L.
Motor vehicles
Power
Electric
180165, 180 654, 180 656, 180 657, 318375, 310114, 290 40C, B60K 100
Patent
active
060987359
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a hybrid drive system and also relates to a control device for a hybrid drive system.
It is previously known to arrange a hybrid drive system as a vehicle drive. For example DE-A-41 18 678 relates to a hybrid drive system which comprises an internal combustion engine, an electric battery and a drive shaft which can be driven by the internal combustion engine and the battery. The transmission of the energy from the internal combustion engine and the energy of the battery to the drive shaft is effected via a slip ring motor or an energy converter comprising two concentric rotors. The outer rotor, which is joined to the shaft of the internal combustion engine, is provided with permanent magnets and the inner rotor, which is joined to the drive shaft, is provided with windings which are supplied with alternating current with the aid of slip rings, and which are coupled via a current-converter to the battery. The drive shaft is joined to a transmission of a fixed gear ratio which distributes the rotory movement of the drive shaft to the wheel axles of the vehicle.
U.S. Pat. No. 3,796,278 relates to a control system for a hybrid drive system which, in one embodiment, comprises an internal combustion engine, a current source, an electromagnetic clutch, an electric motor and a gearbox. The internal combustion engine is coupled to the electric motor via the electromagnetic clutch. The output shaft of the electric motor is joined to the gearbox. The electromagnetic clutch is constructed of two concentric rotors, one of which is provided with a winding supplied with current from the current source. The hybrid drive system is controlled by control units which regulate the current supply to the electric motor.
SUMMARY OF THE INVENTION
One purpose of the present invention is to achieve a hybrid drive system which makes possible optimal distribution of load between the internal combustion engine and the battery with regard to environmental requirements, such as the emissions of the system and with regard to operating life and operating characteristics.
An additional purpose is to achieve a hybrid drive system which makes driving possible by means of an electrically driven energy converter which is supplied by a power source and an internal combustion engine, the mean value over time of the expended energy from the power source being zero or nearly zero over a defined time period.
A further purpose of the invention is to achieve a control device which makes possible in an advantageous manner optimum operation of the hybrid drive system.
A hybrid drive system with the characteristic features of the present invention achieves exceptional efficiency in the internal combustion engine since the variable transmission in combination with the electrical energy converter permits increased freedom to allow the internal combustion engine to work at optimum rpm and torque.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described in more detail below with reference to a number of examples which are shown in the accompanying drawings.
FIG. 1 shows a series hybrid system according to known technology.
FIG. 2 shows a parallel hybrid system according to known technology.
FIGS. 3A-3C show in diagram form how the outputs of the components in a hybrid drive system interact.
FIG. 4 is a schematic drawing of a hybrid drive system according to the invention.
FIGS. 5A-5D show the characteristics of an internal combustion engine in the form of efficiency and emission diagrams.
FIG. 6 shows a block diagram of a control device in a hybrid drive system according to the invention.
FIG. 7 shows a partially sectioned side view of an energy converter according to the invention.
DETAILED DESCRIPTION OF THE INVENTION
Hybrid drive systems for vehicles can essentially be divided into two groups: series hybrid systems and parallel hybrid systems. Series hybrid systems, as shown in FIG. 1, consist essentially of an internal combustion engine 1, an AC generator 2, a rectifier 3, a
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Backstrom Thomas
Ostlund Stefan
Sadarangani Chandur
ABB AB
Fischmann Bryan
Johnson Brian L.
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