Electronic Control for Cylinder Impulse Charge Systems 2005-01-0761
New cylinder impulse charge systems permit higher torque at low speed and promise substantial downsizing potential ongoing with reduced fuel consumption and lower emissions. Their immediate response avoids the disturbing delay of turbochargers. Using a fast switching valve in the air intake manifold, they generate a dynamic pressure increase, which provides higher cylinder air mass filling. The short transient times needed for the valve opening and closing process together with the required low air leakage rate call for an effective drive. Electromagnetic spring-mass actuators are well suited for this task. They generate high control forces over long distances and can be designed for transient times below 2 ms. However, they suffer from high impact energies at the stop positions und cannot be used without movement control for the armature. Tight commercial conditions restrict the application of sensors and complex hard- and software. An effective electronic control unit is presented without need of a position or speed sensor. Low impact speed and high robustness towards pressure variation are reached. The complete electronics for a 4 cylinder engine demonstrates the performance of this technical and commercial trade-off.