Optimal firing patterns for cylinder deactivation control with limited deactivation mechanisms
First Claim
1. An engine system for a vehicle, the engine system comprising:
- an engine comprising;
X cylinders configured to combust a mixture of an air and a fuel to generate drive torque, where X is an integer greater than or equal to four; and
Y deactivation mechanisms, each of the Y deactivation mechanisms being configured to deactivate a different one of the X cylinders, wherein Y is an integer less than X and greater than (X/2), and wherein the Y deactivation mechanisms are arranged in an optimal Y of the X cylinders for a defined firing order of the X cylinders; and
a controller configured to;
determine a torque request for the engine;
determine a set of potential firing fractions of the engine, each firing fraction representing a particular Z of the X cylinders being deactivated, where Z is an integer greater than or equal to zero and less than or equal to Y;
based on the torque request, determine an optimal firing fraction of the set of potential firing fractions;
based on the optimal firing fraction, command a corresponding Z of the Y deactivation mechanisms to deactivate the determined Z of the X cylinders; and
command firing of a remainder the X cylinders.
1 Assignment
0 Petitions
Accused Products
Abstract
An engine system for a vehicle includes an engine comprising X cylinders (X≥4) and Y deactivation mechanisms (X/2<Y<X), each of the Y deactivation mechanisms being configured to deactivate a different one of the X cylinders and wherein the Y deactivation mechanisms are arranged an optimal Y of the X cylinders for a defined firing order of the X cylinders. The engine system further includes a controller configured to: determine a torque request for the engine, determine a set of potential firing fractions of the engine, each firing fraction representing a particular Z of the X cylinders being deactivated (0<Z≤Y) based on the torque request, determine an optimal firing fraction of the set of potential firing fractions, based on the optimal firing fraction, command a corresponding Z of the Y deactivation mechanisms to deactivate the determined Z of the X cylinders, and command firing of a remainder the X cylinders.
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Citations
19 Claims
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1. An engine system for a vehicle, the engine system comprising:
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an engine comprising; X cylinders configured to combust a mixture of an air and a fuel to generate drive torque, where X is an integer greater than or equal to four; and Y deactivation mechanisms, each of the Y deactivation mechanisms being configured to deactivate a different one of the X cylinders, wherein Y is an integer less than X and greater than (X/2), and wherein the Y deactivation mechanisms are arranged in an optimal Y of the X cylinders for a defined firing order of the X cylinders; and a controller configured to; determine a torque request for the engine; determine a set of potential firing fractions of the engine, each firing fraction representing a particular Z of the X cylinders being deactivated, where Z is an integer greater than or equal to zero and less than or equal to Y; based on the torque request, determine an optimal firing fraction of the set of potential firing fractions; based on the optimal firing fraction, command a corresponding Z of the Y deactivation mechanisms to deactivate the determined Z of the X cylinders; and command firing of a remainder the X cylinders. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification