System and method for controlling vehicle operation
First Claim
1. A hybrid vehicle propulsion system, comprising:
- an engine having at least one combustion cylinder configured to operate in a first and a second combustion mode, wherein the first combustion mode is a spark ignition mode and the second combustion mode is a compression ignition mode, wherein the engine is configured to supply an engine output;
a motor configured to selectively supply or absorb a secondary output;
an energy storage device configured to selectively store at least a portion of the engine output and selectively supply energy to the vehicle;
a lean NOx trap configured to store NOx produced by the engine; and
a controller configured to control at least the engine, the motor, and the energy storage device, wherein the controller is configured to selectively operate said at least one combustion cylinder in one of the spark ignition mode and the compression ignition mode based on a condition of the lean NOx trap.
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Accused Products
Abstract
A hybrid vehicle propulsion system is disclosed comprising an engine having at least one combustion cylinder configured to operate in a first and a second combustion mode, wherein the first combustion mode is a spark ignition mode and the second combustion mode is a compression ignition mode, wherein the engine is configured to supply an engine output; a motor configured to selectively supply or absorb a secondary output; an energy storage device configured to selectively store at least a portion of the engine output and selectively supply energy to the vehicle; a lean NOx trap configured to store NOx produced by the engine; and a controller configured to control at least the engine, the motor, and the energy storage device, wherein the controller is configured to selectively operate said at least one combustion cylinder in one of the spark ignition mode and the compression ignition mode based on a condition of the lean NOx trap.
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Citations
24 Claims
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1. A hybrid vehicle propulsion system, comprising:
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an engine having at least one combustion cylinder configured to operate in a first and a second combustion mode, wherein the first combustion mode is a spark ignition mode and the second combustion mode is a compression ignition mode, wherein the engine is configured to supply an engine output; a motor configured to selectively supply or absorb a secondary output; an energy storage device configured to selectively store at least a portion of the engine output and selectively supply energy to the vehicle; a lean NOx trap configured to store NOx produced by the engine; and a controller configured to control at least the engine, the motor, and the energy storage device, wherein the controller is configured to selectively operate said at least one combustion cylinder in one of the spark ignition mode and the compression ignition mode based on a condition of the lean NOx trap. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of operating an engine having at least one combustion cylinder configured to produce at least a first portion of a vehicle wheel output, wherein the engine is configured to selectively operate said at least one combustion cylinder in one of a compression ignition mode and a spark ignition mode, the engine having an exhaust passage configured with an aftertreatment system, wherein the aftertreatment system includes at least a lean NOx trap, the method comprising:
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performing the compression ignition lean mode during a first condition;
in said at least one combustion cylinderperforming a transition in said at least one combustion cylinder from the compression ignition mode to the spark ignition mode during a second condition; and performing the spark ignition mode in said at least one combustion cylinder during a third condition, wherein the third condition includes at least performing a purge of the lean NOx trap. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A vehicle propulsion system configured to provide a wheel output, comprising:
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a plurality of combustion cylinders providing a first portion of the wheel output, where the combustion cylinders are configured to operate in either a first combustion mode or a second combustion mode, where the combustion cylinders are transitioned between the first combustion mode and the second combustion mode when the wheel output crosses one of a lower output threshold and an upper output threshold value; and an energy storage device configured to provide a second portion of the wheel output in parallel with the first output of the combustion cylinders; a lean NOx trap configured arranged in an exhaust passage; a controller configured to control the plurality of combustion cylinders and the energy storage device so that the engine is operated in one of the first combustion mode and the second combustion mode based on a condition of the lean NOx trap; and a chassis configured to couple the plurality of combustion cylinders, the energy storage device, the lean NOx trap, and the controller. - View Dependent Claims (19, 20, 21, 22)
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23. A method of operating an engine having at least one combustion cylinder, wherein said at least one combustion cylinder is configured to selectively operate in one of a compression ignition mode and a spark ignition mode, the engine having an exhaust passage configured with an aftertreatment system, wherein the aftertreatment system includes at least a lean NOx trap, the method comprising:
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performing the spark ignition mode in said at least one combustion cylinder; performing a purge of the lean NOx trap before transitioning said at least one combustion cylinder to the compression ignition mode; and transitioning said at least one combustion cylinder to the compression ignition mode. - View Dependent Claims (24)
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Specification