With the introduction of the high-pressure, direct-injection
(HPDI) technology in the European automotive market, and through
partnerships with major European car manufacturers, Siemens
Automotive S.A. has developed a complete and versatile gasoline
direct-injection system, which has proved to be compliant with
different car manufacturers approaches.
One major problem for HPDI systems is the control of all the
dispersions that can endanger the system performances.
After describing the main dispersion sources and ranges, this
paper makes therefore a review of the control solutions developed
by Siemens Automotive S.A. for industrial HPDI system on the basis
of two key topics: 1. Torque stability control through cylinder
individual control of injection, using information out of engine
roughness. The paper describes: - the signal acquisition and
processing to get the engine roughness information - the controller
which reduces engine roughness up to acceptable values by modifying
the injected fuel mass - test results of the strategy 2. Air-fuel
ratio stability control using information given by a Wide Range
Air- Fuel Ratio (WRAFR) linear sensor. The paper describes; - the
signal processing - the control solution - test results of the
strategy
Then the paper describes how the two above strategies can
cooperate in the engine management system.