Multiple Combustion Mode Engine Using Direct Alcohol Injection
First Claim
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1. A method of operating an engine, comprising:
- performing homogeneous charge compression ignition combustion during a first operating condition; and
performing spark ignition combustion during a second operating condition; and
transitioning between said homogeneous charge compression ignition and said spark ignition combustion, where an amount of alcohol in at least one of said homogeneous charge compression ignition combustion and in said spark ignition combustion is varied in response to the transition, where variation of the amount of alcohol during the transition is further based on an operating parameter of the transition.
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Abstract
A method of operating an engine, comprising of performing homogeneous charge compression ignition combustion during a first operating condition, and performing spark ignition combustion during a second operating condition, where an amount of directly injected alcohol in at least one of said homogeneous charge compression ignition combustion and said spark ignition combustion is varied in response to at least an operating parameter.
94 Citations
28 Claims
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1. A method of operating an engine, comprising:
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performing homogeneous charge compression ignition combustion during a first operating condition; and performing spark ignition combustion during a second operating condition; and transitioning between said homogeneous charge compression ignition and said spark ignition combustion, where an amount of alcohol in at least one of said homogeneous charge compression ignition combustion and in said spark ignition combustion is varied in response to the transition, where variation of the amount of alcohol during the transition is further based on an operating parameter of the transition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15-18. -18. (canceled)
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19. An engine system, comprising:
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at least one combustion chamber; a fuel system for delivering a first fuel including gasoline and a second fuel including alcohol to the combustion chamber; and a control system to transition the combustion chamber from an auto-ignition combustion mode to a spark ignition combustion mode, where in response to the transition, the control system provides a rich air-fuel ratio with at least some of said second fuel delivered to the combustion chamber. - View Dependent Claims (20, 21, 22, 26)
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23. A method for an engine operable in each of an HCCI and a SI combustion mode, the engine coupled to a control module and at least one real time sensor indicative of engine knock or location of peak combustion pressure, the method comprising:
operating in HCCI mode at low load and SI mode at high load, with a knock suppressing fuel mixture added in each mode to control combustion and to avoid knock and where a transition between modes and an amount and timing of the knock suppressing fuel mixture during the transition is determined from both information stored in the control module and by feedback from the real time sensor, where said addition enables increased manifold pressure operation. - View Dependent Claims (24, 25)
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27. A method of operating an engine, comprising:
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performing homogeneous charge compression ignition combustion during a first operating condition; performing spark ignition combustion during a second operating condition; and transitioning from said homogeneous charge compression ignition to said spark ignition combustion, where a knock suppression is increased at least during a first spark ignition combustion during the transition compared to that of a previous homogenous charge compression ignition combustion; and varying an amplitude and duration of enrichment during the transition in response to operating parameters. - View Dependent Claims (28)
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Specification