Starter/generator for an internal combustion engine, especially an engine of a motor vehicle
AssigneesISAD Electronic Systems GmbH & Co. KG, Grundl und Hoffman GmbH
InventorsUllrich Masberg, Thomas Pels, Klaus-Peter Zeyen, Andreas Gr{umlaut over (u)}ndl, Bernhard Hoffmann
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Abstract
The invention concerns a starter/generator for an internal combustion engine (1), especially that of a motor vehicle, with an electric rotary-field machine (4), which exercises the starter and generator function; and at least one invertor (17) for generating the voltages and/or currents of variable frequency, amplitude and/or phase required for the magnetic fields of the electric machine (4); wherein the electric machine (4) starts the internal combustion engine (1) by merging in from standstill.
Claims24
Starter/generator for an internal combustion engine (1) of a motor vehicle, wherein the improvement comprises
- an on-board network having a first voltage level;
- an electric rotary-field machine (4), which exercises the starter and generator function;
- and
- at least one invertor (17) to generate the voltages and currents having at least one variable including frequency, amplitude, and phase required for the magnetic fields of the electric machine (4) by sine-evaluated pulse modulation with a clock frequency greater than 10 kHz;
- wherein the inverter (17) has an intermediate circuit with a second voltage level;
- wherein the inverter (17) in the intermediate circuit is outfitted with an energy accumulator (19, 24) to store up energy for the starter operation;
- wherein the second voltage level is higher than the first voltage level;
- and
- wherein both the energy withdrawal from the intermediate circuit in the starter operation of the electric machine (4) and the energy storage in the intermediate circuit in the generator operation take place at the second voltage level.
Dependencies are inferred from the claim text.