The complexity of internal combustion engines is rapidly increasing in response to rigorous combustion efficiency demands and emission legislations. In order to meet these demands it is essential to optimize the performance of the engines by developing control systems that provide greater freedom to respond to changes in conditions. To date, open-loop control systems based on calibration maps optimized for a fixed set of operating conditions have generally been used rather than closed-loop control strategies. However, the cost and complexity of such calibration maps are rapidly becoming unacceptable, and closed-loop control systems also appear to be essential for further increases in efficiency.
A vital part of a system for closed-loop combustion control is sensors providing combustion information that can be fed back to the controller. This project investigates the use of a crankshaft integrated torque sensor for this purpose. The work includes development of methods for both combustion property estimation and closed-loop combustion property control. Developed methods are implemented and evaluated online using an experimental light-duty diesel engine.
Figure: Volvo Cars
Project partner: Volvo Cars
Project time: 2000-2005