Method for controlling an internal combustion engine
AssigneeMTU Friedrichshafen GmbH
InventorArmin Dölker
Life of this patent
Estimating the term…
Abstract
A common rail injection system for an internal combustion engine, wherein upon detection of a defective rail sensor system the transition from the normal operation to the emergency operation is determined reliably by means of a transition function. The transition function is determined beforehand from the characteristics of a system deviation as a function of time during normal operation. In so doing, the system deviation is calculated from a variance comparison of the rail pressure. The result of this defect transition process is a more noise-proof and more continuous transition from the normal operation to the emergency operation.
Claims29
A method for controlling an internal combustion engine with a common rail injection system, comprising the acts of:
- regulating a rail pressure during a normal operation;
- determining whether a rail pressure sensor is defective;
- switching, upon determining the rail pressure sensor is defective, from normal operation to an emergency operation, wherein the switching from the normal operation to the emergency operation is controlled in accordance with a transition function;
- calculating system deviations during normal operation from a variance comparison of a rail pressure-actual value with a rail pressure-desired value;
- and
- determining the transition function from at least one of the system deviations.
A system for controlling an internal combustion engine with a common rail injection system, comprising:
- means for regulating a rail pressure during a normal operation;
- means for determining whether a rail pressure sensor is defective;
- means for switching, upon determining the rail pressure sensor is defective, from normal operation to an emergency operation, wherein the switching from the normal operation to the emergency operation is controlled in accordance with a transition function;
- means for calculating system deviations during normal operation from a variance comparison of a rail pressure-actual value with a rail pressure-desired value;
- and
- means for determining the transition function from at least one of the system deviations.
A system for controlling an internal combustion engine with a common rail injection system, comprising:
- a rail pressure regulator;
- a rail pressure sensor;
- and
- a controller, the controller
- controlling the rail pressure regulator to control rail pressure in at least a normal operation and an emergency operation, wherein upon a determination that the rail pressure sensor is defective, the controller switches rail pressure control from normal operation to emergency operation in accordance with a transition functions
- calculating system deviations during normal operation from a variance comparison of a rail pressure-actual value with a rail pressure-desired value;
- and
- determining the transition function from at least one of the system deviations.
Dependencies are inferred from the claim text.