Injection Rate Analyzer for Solenoid and Piezo Injectors
Introduction
The internal combustion engine (ICE) is still crucial in the field of mobility due to its high efficiency, durability, high power density, and reliability. Nevertheless, the ICE is currently facing considerable challenges. For sustainable long-term operation of ICE, it is mandatory to further reduce engine-out emissions and increase engine efficiency.
Especially for diesel engines the injection rate is very important because it takes place shortly before the compression ignition. Therefore, it has a high impact on fuel air mixture and the resulting efficiency and emissions formation. Forming the injection rate can directly have a high influence on the combustion of the engine. Digital rate shaping has turned out to be an option by using a regular injector and design the heat release rate by multiple injections. In order to control the combustion accurate a well-known injector model is needed in order to predict the injection rate with the actuation settings of the injector.
Figure 2: IAV Cross Systems (IAV).
Measurement System
The IAV Cross is a precise device for measuring injection rate profiles and amount of fuel for up to 15 injections per engine cycle. According to a measurement method developed by Bosch the injection Rate can directly be calculated from the measured pressure. Together with an open engine control unit (ECU) by VEMAC we build up a test bench with accurate power amplifiers for solenoid and piezo injectors. In order to generate a solid database a Simulink model was created with MATLAB in order to run experiments automatically with predefined measurement plans. This enables a high repeatability and efficiency of the test bench.
Figure 3: Measurement Methode (IAV).
As Injection system a common rail system from Bosch series application is used, which delivers injection pressures up to 2000 bar. Additionally, a high-pressure system from Resato can be used which allows a high resistance against corrosive and less lubricating fuels up to 2000 bar as well. This allows the test bench a high flexibility of analyzing modern hardware and fuels.
Publications
- D. Ritter, M. Korkmaz, H. Pitsch, D. Abel and T. Albin. Optimization-based fuel injection rate digitalization for combustion rate shaping. In American Control Conference, July 10th-12th, Philadelphia, PA, USA, 2019. [LINK]
- D. Ritter, D. Abel, M. Korkmaz, H. Pitsch, S. Hänggi and T. Albin. Optimierungsbasierte Verbrennungsratenregelung für Dieselmotoren mittels Mehrfacheinspritzung. In 29. Deutscher Flammentag, 17.-18. September, Bochum, 2019. [LINK]