Path planning during combustion mode switch

摘要

Systems and methods are provided for transitioning between a first combustion mode and a second combustion mode in an internal combustion engine. A current operating point of the engine is identified and a target operating point for the internal combustion engine in the second combustion mode is also determined. A predefined optimized transition operating point is selected from memory. While operating in the first combustion mode, one or more engine actuator settings are adjusted to cause the operating point of the internal combustion engine to approach the selected optimized transition operating point. When the engine is operating at the selected optimized transition operating point, the combustion mode is switched from the first combustion mode to the second combustion mode. While operating in the second combustion mode, one or more engine actuator settings are adjusted to cause the operating point of the internal combustion to approach the target operating point.

主权项

1. A method of transitioning between a first combustion mode and a second combustion mode in an internal combustion engine, the method comprising:
identifying a current operating point for the internal combustion engine operating in the first combustion mode, the current operating point including a current value of a first operating parameter of the internal combustion engine and a current value of a second operating parameter of the internal combustion engine; determining a target operating point for the internal combustion engine to be operating in the second combustion mode, the target operating point including a target value of the first operating parameter and a target value of the second operating parameter; predicting a path of operating points for the internal combustion engine as the operating point of the engine moves from the current operating point to the target operating point; accessing from a memory a plurality of optimized transition operating points, each optimized transition operating point including a target transition value of the first operating parameter and a target transition value of the second operating parameter; selecting an optimized transition operating point from the plurality of optimized transition operating points that is closest to the predicted path of operating points; adjusting one or more engine actuator settings while operating in the first combustion mode to cause the first operating parameter to approach the target transition value of the first operating parameter for the selected optimized transition operating point and to cause the second operating parameter to approach the target transition value of the second operating parameter for the selected optimized transition operating point; changing from the first combustion mode to the second combustion mode when the first operating parameter is substantially equal to the target transition value of the first operating parameter for the selected optimized transition operating point and the second operating parameter is substantially equal to the target transition value of the second operating parameter for the selected optimized transition operating point; and adjusting one or more engine actuator setting, after changing from the first combustion mode to the second combustion mode, to cause the first operating parameter to approach the target value of the first operating parameter and to cause the second operating parameter to approach the target value of the second operating parameter.