Browse Publications Technical Papers 2000-05-0059

Gasoline direct injection: Review of latest developments 2000-05-0059

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.


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