Hybrid Drive System and Method for Controlling a Hybrid Drive System
First Claim
1. A hybrid drive system for a vehicle, comprising:
- an internal combustion engine;
a generator coupled to the internal combustion engine;
a plurality of electric drive motors connected to the generator via a generator converter, a voltage intermediate circuit and a motor converter;
an energy store connected to the voltage intermediate circuit;
a first switch dividing the voltage intermediate circuit into two intermediate circuit elements, wherein at least one drive motor is connected via its associated motor converter to one of the two intermediate circuit elements, and at least one other drive motor is connected via its associated motor converter to the other of the two intermediate circuit elements.
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Accused Products
Abstract
The invention relates to a hybrid driving system for a vehicle comprising a generator connected to an internal combustion engine (1) which is linked to an electric driving motor (6) by means of a generator frequency converter, an intermediate voltage circuit and a motor frequency converter. An energy-storage reservoir (7) is connected to the intermediate voltage circuit. According to said invention, the intermediate voltage circuit is divisible into two partial intermediate circuits (3, 4) by means of a first switch (8). Each partial intermediate circuit comprises at least one driving motor (5, 6, 12) connected by means of the corresponding motor frequency converter. The aim of said invention is to adjust the hybrid driving system. For this purpose, when the voltage (U3) in the energy-storage reservoir (7) is lower than the voltage of the corresponding intermediate voltage circuit, the first switch (8) arranged between two intermediate circuits (3, 4) switches off the link and the first switch (8) becomes an open conductor only.
11 Citations
9 Claims
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1. A hybrid drive system for a vehicle, comprising:
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an internal combustion engine; a generator coupled to the internal combustion engine; a plurality of electric drive motors connected to the generator via a generator converter, a voltage intermediate circuit and a motor converter; an energy store connected to the voltage intermediate circuit; a first switch dividing the voltage intermediate circuit into two intermediate circuit elements, wherein at least one drive motor is connected via its associated motor converter to one of the two intermediate circuit elements, and at least one other drive motor is connected via its associated motor converter to the other of the two intermediate circuit elements. - View Dependent Claims (2, 9)
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- 3. In a hybrid drive system for a vehicle with a generator coupled to an internal combustion engine, with a plurality of electric drive motors connected to the generator via a generator converter, with a voltage intermediate circuit and a motor converter, with an energy store connected to the voltage intermediate circuit, with a first switch dividing the voltage intermediate circuit into two intermediate circuit elements, wherein at least one drive motor is connected via its associated motor converter to one of the two intermediate circuit elements, and at least one other drive motor is connected via its associated motor converter to the other of the two intermediate circuit elements, a method for controlling the hybrid drive system, comprising the step of interrupting with the first switch a connection between the two intermediate circuit elements when a voltage on the energy store is lower than a smallest required intermediate-circuit voltage, and maintaining the first switch in a conductive state if the voltage on the energy store is equal or greater than the smallest required intermediate-circuit voltage.
Specification