Siemens Aktiengesellschaft

Ise Corporation

Other

Eugen Holl

Juergen J Schulte

Swen O Ruppert

Swen Ruppert

Manfred Schmidt

Gunther Birk

J&uuml;rgen Fetzer

Hans-Peter Lang

This invention is a system and a method that uses the braking resistor, commonly used and available in electrically or hybrid-electrically propelled vehicles, to limit the precharge current during the startup of a high power ultracapacitor pack energy storage device and/or safely and rapidly discharge an ultracapacitor pack for maintenance work or storage to lengthen the life of the individual ultracapacitor cells and, correspondingly, the whole pack. The use of the braking resistor for precharging an ultracapacitor energy storage pack is an effective and less expensive method compared to other methods such as a separate DC-to-DC converter. This method includes the control logic sequence to activate and deactivate switching devices that perform the connections for the charging and discharging current paths.

System and method for precharging and discharging a high power ultracapacitor pack

A hybrid driving system for a vehicle including a generator connected to an internal combustion engine () which is linked to an electric driving motor () by means of a generator frequency converter, an intermediate voltage circuit and a motor frequency converter. An energy-storage reservoir () is connected to the intermediate voltage circuit. The intermediate voltage circuit is divisible into two partial intermediate circuits () by means of a first switch (). Each partial intermediate circuit includes at least one driving motor () connected by means of the corresponding motor frequency converter. For the purpose of adjusting the hybrid driving system, when the voltage (U) in the energy storage reservoir () is lower than the voltage of the corresponding intermediate voltage circuit, the first switch () arranged between two intermediate circuits () switches off the link and the first switch () becomes an open conductor only.

Hybrid drive system and method for controlling a hybrid drive system

A hybrid drive system is for a vehicle and includes an intermediate circuit and an energy accumulator. The energy accumulator is connected to the intermediate circuit by way of a diode, whereby a transistor enabling current to flow in an opposite direction is connected parallel thereto. The transistor is placed in a blocking position in order to discharge the energy accumulator and the diode enables current to pass. If the energy accumulator is not used, the diode is also blocked by increasing the voltage of the intermediate circuit with the aid of the voltage on the energy accumulator. In order to charge the energy accumulator, the transistor is conductingly switched. The diode does not allow the current to pass in this direction.

Hybrid drive system and method for adjusting a hybrid drive system

The present invention relates to a control system for a hybrid system comprising at least one energy store ( ) and an energy source ( ), the control system using a charge state (Z) in the at least one energy store ( ), a nominal operating point (P ) of the energy source ( ) and a system power (P ) which is currently to be output to ascertain a storage power (P ) which is to be output or received by the at least one energy store ( ) and a source power (P ) which is to be output by the energy source ( ) on the basis of at least one optimization criterion. In order to create a particularly flexible control system, the invention provides that at least one charge limit value (P , P , P ) and at least one discharge limit value (P , P , P ) for the at least one energy store ( ) and a power limit value (P ) for the energy source ( ) are also used at the same time in order to ascertain the storage power (P ) and the source power (P ), and that the at least one charge limit value (P , P , P ), the at least one discharge limit value (P , P , P ), the power limit value (P ) and the nominal operating point (P ) can be parameterized via an interface ( ) in the control system.

Control system for a hybrid system consisting of at least one energy accumulator and one energy source

A method and a device for controlling a sensorless, field-oriented asynchronous machine, wherein a manipulated variable space vector and a stator frequency are calculated, by means of a two-component current control system, from which control signals are generated using a space vector modulation process. A PI controller of an EMF control system for the d-component of a calculated EMR space vector of the field-oriented control system is deactivated and its output signal set to zero at a stator frequency, determined as a function of a calculated d-component of a calculated EMF space vector and a calculated stator frequency, that is less than or equal to a first limit frequency. Thus, the method may be used for speed control of a sensorless, field-oriented asynchronous machine down to a full stop.

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Langenzenn, Germany

Eugen Holl