Patent ID: 6427445
Filing Date: 2002-08-06
Classification: F02D,Y02T

Abstract:
An internal combustion engine comprising:a turbocharger that creates engine boost and comprises a selectively positionable mechanism for controlling the amount of boost created by passage of exhaust gas through the turbocharger; a control for selectively positioning the mechanism to control the amount of boost in accordance with data inputs; wherein the control comprises a processor for processing data, including the data inputs, to develop a control signal for selectively positioning the mechanism; a first data input to the processor comprising data corresponding to engine load; a second data input to the processor comprising data corresponding to engine speed; a look-up table programmed with values representing desired boost corresponding to sets of values representing various combinations of engine speed and engine load; a third data input to the processor comprising data corresponding to the amount of boost being created by the turbocharger; wherein the processor selects from the look-up table a value for desired boost corresponding to values of the first data input and the second data input; the processor processes the value of the third data input and the selected value for desired boost from the look-up table to generate error data defining error between the amount of boost being created by the turbocharger and the desired boost; and the processor further processes the error data according to the value of the error data to cause the control signal to position the mechanism to reduce the error such that when the error data is less than a predetermined value, further processing comprises processing the error data with proportional, integral, and derivative control, and when the error data is not less than the predetermined value, the further processing comprises processing the error data with proportional and derivative control but without integral control.