Engine control system having a cam phaser

摘要

A control system for a gaseous-fueled engine is disclosed. The gaseous-fueled engine may have an intake valve mechanically driven by a camshaft. The control system may have a variable valve timing device configured to adjust a cyclical opening and closing timing of the intake valve. The control system may further have a sensor configured to generate a signal indicative of a speed of the engine and a controller in communication with the variable valve timing device and the sensor. In addition, the controller may be configured to selectively initiate a first Miller Cycle timing and a second Miller Cycle timing based on the signal.

主权项

1. A control system for a gaseous-fueled engine including an intake valve mechanically driven by a camshaft, the control system comprising:
a cam phaser located between the camshaft and a crankshaft and configured to adjust a cyclical opening and closing timing of the intake valve, the camshaft including a cam lobe shaped such that the cyclical opening and closing of the intake valve corresponds to a Miller Cycle timing; a sensor configured to generate a signal indicative of a speed of the engine; and a controller in communication with the variable valve timing device and the sensor, wherein the controller is configured to selectively initiate a first Miller Cycle timing and a second Miller Cycle timing based on the signal, wherein the cam phaser is spring-biased to an initial position associated with the first Miller Cycle timing after the gaseous-fueled engine is shut down, wherein the camshaft is configured to cause the cyclical opening and closing of the intake valve through rotation of the cam lobe, and wherein the intake valve is the only intake valve associated with one cylinder of a plurality of cylinders of the engine.