US 12,006,884 B1 · Split cycle waste heat method for combustion initiation in gasoline compression ignition engine

Abstract

Systems and methods for having discrete valve opening and closing timings for different pairs of the combustion cylinders, and transitioning an engine from a Low temperature Combustion (LTC) mode to a Gasoline Compression Ignition (GCI) mode are provided. The method may comprise performing a cold start on an engine, comprising at least two sets of cylinders, in a Spark Ignition (SI) mode. The method may comprise, using a discrete camshaft operation for different pairs of the combustion cylinders to run the at least two sets of cylinders in the LTC mode, and when a load operation point of the engine increases, transitioning a first set of cylinders, of the at least two sets of cylinders, to run in a SI mode, and, after the first set of cylinders is transitioned to run in the SI mode, transitioning the second set of cylinders to run in the GCI mode, and, after the second set of cylinders is transitioned to run in the GCI mode, transitioning the first set of cylinders to run in the GCI mode.

Claims12

Dependent claims

A method for transitioning an engine from a Low temperature Combustion (LTC) mode to a Gasoline Compression Ignition (GCI) mode, comprising:

performing a cold start on an engine, wherein:
the engine comprises at least two sets of cylinders, wherein each set of cylinders comprises a two-cylinder pair of cylinders, and
each pair of cylinders is capable of differing camshaft operating points, consisting of identical cam lob shapes with discrete control mechanisms consisting of a CVVD mechanism on each discrete pair of cylinders, and a discrete CVVT system on each discrete pair of cylinders,
performing the cold start comprises running all of the at least two sets of cylinders in a Spark Ignition (SI) mode;
and
using a discrete camshaft operation for a different pair of combustion cylinders to run all of the at least two sets of cylinders in a LTC mode:
when a load operation point of the engine increases:
transitioning a first set of cylinders, of the at least two sets of cylinders, to run in a SI mode;
and
after the first set of cylinders is transitioned to run in the SI mode, transitioning a second set of cylinders, of the at least two sets of cylinders, to run in the GCI mode;
and
after the second set of cylinders are transitioned to run in the GCI mode:
transitioning the first set of cylinders to run in a GCI mode.

10 more elements

A system for transitioning an engine from a Low temperature Combustion (LTC) mode to a Gasoline Compression Ignition (GCI) mode, comprising:

an engine comprising at least two sets of cylinders, wherein each set of cylinders comprises a two-cylinder pair of cylinders
wherein the engine is configured to perform a cold start on an engine, comprising running all of the at least two sets of cylinders in a Spark Ignition (SI) mode;
and
a discrete camshaft for a different pair of combustion cylinders configured to run all of the at least two sets of cylinders in a LTC mode:
when a load operation point of the engine increases:
transition a first set of cylinders, of the at least two sets of cylinders, to run in a SI mode;
and
after the first set of cylinders is transitioned to run in the SI mode, transition a second set of cylinders, of the at least two sets of cylinders, to run in the GCI mode;
and
after the second set of cylinders is transitioned to run in the GCI mode:
transition the first set of cylinders to run in a GCI mode.

8 more elements

Dependencies are inferred from the claim text.

Split cycle waste heat method for combustion initiation in gasoline compression ignition engine

Life of this patent

Split cycle waste heat method for combustion initiation in gasoline compression ignition engine

Life of this patent

Abstract

Claims12