Abstract:
A method for controlling an engine output with at least two actuators, including applying inputs to actuators which regulate a variable of an engine, evaluating the response of the system, determining the ability of the actuators to change the engine variable, determining the capability of the actuators to reject a disturbance, calculating an optimum actuator feedforward control function based upon the ability and capability determined and controlling the actuators using the calculated function and a feedforward control algorithm.
Abstract:
The invention is directed to rolls comprising a polyurethane elastomer formed from a polyurethane mixture comprising, inter alia, at least one graft polyacrylate curative, and processes for manufacturing such rolls. The roll is suitable for employment in image forming devices, for example in electrophotographic print applications.
Abstract:
A voltage-controlled delay line (VCDL) comprises a series of delay cells outputting a clock output signal having a delay relative to a clock input signal input to the series of delay cells. A duty-cycle correction section corrects the duty cycle of the clock output signal by providing opposite current outputs which are fed back to the series of delay cells to substantially simultaneously charge and discharge current of the series of delay cells in opposite directions. A control current input to the series of delay cells controls the amount of the delay. A voltage-to-current converter converts a control voltage into the control current so that the delay changes substantially linearly as the control voltage changes. The method for using the VCDL to produce linear delay is also included. The VCDL can be used in a delay-locked loop (DLL).
Abstract:
A method for predicting oxygen capacity of an LNT during storage phase of such LNT and the amount of NOx stored in the LNT during purge phase thereof as a function of the time history of an output signal produced by an exhaust gas sensor disposed downstream of the LNT. Oxygen storage capacity of the (LNT) is estimated by integrating output signal over time to determine the amount of oxygen stored in the LNT as function of time.
Abstract:
A method of operating a variable compression, direct injection spark ignited internal combustion engine includes the steps of determining a demanded torque output of the engine, determining a current combustion mode and a current compression ratio mode of the engine; transitioning operation of the engine from the current combustion mode to a new combustion mode to produce the demanded torque output, and transitioning operation of the engine from the current compression ratio mode to a new compression ratio mode so as to minimize torque disturbances during the transitioning of engine operation from the current combustion mode to the new combustion mode.
Abstract:
A computer readable storage medium having stored data representing instructions for controlling a spark ignited direct injection internal combustion engine having a plurality of cylinders operable in at least homogeneous and stratified modes, includes instructions for determining a desired value for an engine operating parameter based on current engine operating conditions wherein the desired value results in scheduling of an air/fuel ratio between homogeneous range and stratified range of allowable air/fuel ratios, instructions for operating a first portion of the cylinders in the homogenous operating mode, and instructions for operating a second portion of the cylinders in the stratified operating mode such that a combined air/fuel ratio associated with the first and second portions of the cylinders approaches the scheduled air/fuel ratio.
Abstract:
A method for controlling mode transitions, such as from stratified to homogeneous mode, in a direct injection engine adjusts a number of cylinders carrying out combustion to prevent engine torque disturbances. Cylinder activation is used when changes in cylinder air/fuel ratio cannot be compensated using ignition timing adjustments. In addition, the number of cylinders to activate is also determined and measures are taken if the number of cylinders determined are not available to be activated.
Abstract:
A method and system for controlling the air charge in a direct injection spark ignition engine that provides proportional plus integral control in positioning an electronic throttle control valve and an exhaust gas recirculating valve in order to compensate for uncertainties in the EGR valve flow area. An adaptation algorithm is used to improve the estimate of in-cylinder flow and throttle open-loop control.
Abstract:
A method for controlling mode transitions, such as from stratified to homogeneous mode, in a direct injection engine adjusts a number of cylinders carrying out combustion to prevent engine torque disturbances. Cylinder activation is used when changes in cylinder air/fuel ratio cannot be compensated using ignition timing adjustments. In addition, the number of cylinders to activate is also determined and measures are taken if the number of cylinders determined are not available to be activated.
Abstract:
A speed control system is shown for an internal combustion engine (10) having an intake manifold (44) and throttling device (96) connected thereto in parallel with the main throttle plate (62). After an idle speed command is detected (200), the engine (10) is decelerated (204-230) to a preselected speed by adjusting the throttling device (96) to concurrently force both engine speed and engine acceleration within a predetermined acceleration/speed range(s). When the preselected speed is reached, engine speed is regulated (300-328) to a desired idle speed by adjusting the throttling device (96) to force a difference between the engine and idle speed towards zero.