Patent ID: 9617930
Date: 2017-04-11
CPC Classifications: F02D,Y02T

Claim:
1. A method for controlling a powertrain, the powertrain including an internal combustion engine having at least one cylinder, an intake manifold in fluid communication with the internal combustion engine, a throttle in fluid communication with the intake manifold, at least one intake valve configured to control airflow between the intake manifold and the internal combustion engine, a system control module, a mass airflow (MAF) sensor in communication with the system control module and configured to measure airflow entering the throttle, and a manifold absolute pressure (MAP) sensor in communication with the system control module and being configured to measure an intake manifold pressure, the method comprising: receiving a torque request, wherein the powertrain further includes a boosting device disposed between the throttle and the intake manifold, a bypass conduit disposed between the throttle and the intake manifold and bypassing the boosting device, and a bypass valve along the bypass conduit and configured to control airflow through the bypass conduit, the system control module includes a processor and a memory in communication with the processor; determining a desired air charge based, at least in part, on the torque request, wherein the desired air charge is an amount of air introduced into the at least one cylinder during a single combustion cycle in order to achieve the torque requested; determining an actual air charge based, at least in part, on input signals from the MAP sensor and the MAF sensor, wherein the actual air charge is a current amount of air introduced into the at least one cylinder during the single combustion cycle; and adjusting an intake valve timing of the at least one intake valve such that the actual air charge is equal to the desired air charge regardless of exhaust manifold pressure or altitude; determining a desired intake manifold pressure based, at least in part, on the torque request; determining an actual intake manifold pressure based, at least in part, on the input signal from the MAP sensor; comparing the actual intake manifold pressure with the desired intake manifold pressure in order to determine if the desired intake manifold pressure is equal to the actual intake manifold pressure; comparing the desired intake manifold pressure with an ambient pressure to determine if the intake manifold pressure is less than the ambient pressure; and moving the bypass valve to a fully open position and adjusting a position of the throttle such that the actual intake manifold pressure is equal to the desired intake manifold pressure regardless of exhaust manifold pressure or altitude if the desired intake pressure is less than the ambient pressure.