Method for dynamically determining ignition mode of engine using dynamic cylinder start-up

Abstract

A system and method for dynamically stopping an engine cylinder of an engine equipped with a cylinder deactivation system that controls torsional vibrations in the engine while stopping the cylinder using a computer that sets a program through a control range of a desired ignition density and engine vibration frequency. The computer dynamically determines a cylinder firing pattern that provides a desired firing density while optimizing cost function norms within a control range of engine vibration frequencies. A cylinder deactivation system in the engine is then controlled using the determined cylinder firing pattern.

Description

technical field [0001] The present disclosure generally relates to a method of dynamically determining a firing mode for operating an engine using dynamic cylinder starting. Background technique [0002] Modern engines generally rely on aftertreatment systems to reduce controlled vehicle emissions. However, diesel engine aftertreatment systems require elevated component temperatures, typically in excess of 200°C, in order to effectively reduce emissions. Cylinder deactivation (CDA) has been shown to be a means of achieving fuel savings and improved aftertreatment thermal management in low to medium load diesel engine operating conditions through lower pump work and air-to-fuel ratio, respectively. Applicants are not aware of any application of diesel engine CDA in land vehicle production. [0003] Experiments published in 2018 confirm that implementing CDA below 3 bar Brake Mean Effective Pressure (BMEP) yields fuel savings of up to 3.4% in the Heavy Duty Federal Test Proc...

AI Technical Summary

Problems solved by technology

The algorithm determines the unbalanced engine order for a given firing pattern using the phase angle method and optimizes the firing pattern by mixed integer programming

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