Gm Global Technolgoy Operations, Inc.

Tula Technology, Inc.

Jinbiao Li

Louis Joseph Serrano

Vijay Srinivasan

Mark A Shost

Xin Yuan

Steven E Carlson

Randall S Beikmann

Li-Chun Chien

Eric J Defenderfer

Nitish J Wagh

Ramakrishna Tatavarthi

Haifeng Liu

Andrew J Kosanka

In one aspect, a skip fire engine controller is described. The skip fire engine controller includes a skip fire module arranged to determine an operational firing fraction and associated cylinder load for delivering a desired engine output. The skip fire engine controller also includes a firing controller arranged to direct firings in a skip fire manner that delivers the selected operational firing fraction. Various methods, modules, lookup tables and arrangements related to the selection of a suitable operational firing fraction are also described.

Method and apparatus for determining optimum skip fire firing profile

A system according to the present disclosure includes a cylinder deactivation module and a valve lift control module. The cylinder deactivation module selectively deactivates a first cylinder of an engine while a second cylinder of the engine is active. When the first cylinder is deactivated, the valve lift control module selectively adjusts a target lift state of a valve actuator of the engine to a first lift state to lift at least one of an intake valve of the second cylinder and an exhaust valve of the second cylinder by a first amount. The valve lift control module selectively adjusts the target lift state of the valve actuator to a second lift state to lift at least one of the intake valve and the exhaust valve by a second amount. The first and second amounts are greater than zero and the second amount is greater than the first amount.

System and method for adjusting the lift state of a valve actuator and for adjusting the number of active cylinders in an engine to improve fuel economy

A selection module selects a gear ratio for a transmission, a turbine speed for a torque converter, and a torque request for an engine. A fueling determination module determines a first fueling rate based on a first cylinder firing fraction, the torque request, and an engine speed and determines a second fueling rate based on a second cylinder firing fraction, the torque request, and the engine speed. A mapping module selects one of the first and second cylinder firing fractions based on a comparison of the first and second fueling rates and stores the selected one of the first and second cylinder firing fractions in an entry of a mapping corresponding to the gear ratio, the turbine speed, and the torque request.

Cylinder firing fraction determination and control systems and methods

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Rochester Hills, MI, United States of America

Jinbiao Li