Implementing skip fire with start/stop feature
First Claim
Patent Images
1. A method for implementing a start/stop feature in a skip fire engine control system, the skip fire engine control system including an internal combustion engine having a plurality of working chambers, the method comprising:
- implementing a stop/start feature that involves automatically turning off the engine under selected circumstances during a drive cycle;
determining that the turned off engine should be restarted; and
during an engine startup period, operating the engine in a skip fire manner until a target engine speed is reached wherein the skip fire operation of the engine involves firing at least one selected working cycle of at least one selected working chamber and deactivating at least one selected working cycle of at least one selected working chamber such that air does not pass through the at least one working chamber during the at least one deactivated working cycle.
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Abstract
A variety of methods and arrangements for implementing a start/stop feature in a skip fire engine control system are described. In one aspect, the implementation of the start/stop feature involves automatically turning off an internal combustion engine under selected circumstances during a drive cycle. A determination is made that the engine should be restarted. During the engine startup period, the engine is operated in a skip fire manner such that a desired engine speed is reached.
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Citations
24 Claims
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1. A method for implementing a start/stop feature in a skip fire engine control system, the skip fire engine control system including an internal combustion engine having a plurality of working chambers, the method comprising:
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implementing a stop/start feature that involves automatically turning off the engine under selected circumstances during a drive cycle; determining that the turned off engine should be restarted; and during an engine startup period, operating the engine in a skip fire manner until a target engine speed is reached wherein the skip fire operation of the engine involves firing at least one selected working cycle of at least one selected working chamber and deactivating at least one selected working cycle of at least one selected working chamber such that air does not pass through the at least one working chamber during the at least one deactivated working cycle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for implementing a start/stop feature in a skip fire engine control system, the skip fire engine control system including an internal combustion engine having a plurality of working chambers, the method comprising:
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implementing a stop/start feature that involves automatically turning off the engine under selected circumstances during a drive cycle; determining that the turned off engine should be restarted; and during an engine startup period, operating the engine in a skip fire manner so that an engine speed substantially follows a desired engine speed restart profile wherein the skip fire engine operation involves firing at least one selected working cycle of at least one selected working chamber and deactivating at least one selected working cycle of at least one selected working chamber such that air does not pass through the at least one working chamber during the at least one deactivated working cycle. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23)
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24. A method for implementing a start/stop feature in a skip fire engine control system, the skip fire engine control system including an internal combustion engine having a plurality of working chambers, the method comprising:
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implementing a stop/start feature that involves automatically turning off the engine under selected circumstances during a drive cycle; and during an engine shutdown period in which the engine speed is dropping from a non-zero speed to a speed of zero, operating the engine in a skip fire manner until the engine speed reaches zero wherein the skip fire operation of the engine involves firing at least one selected working cycle of at least one selected working chamber and deactivating at least one selected working cycle of at least one selected working chamber such that air does not pass through the at least one working chamber during the at least one deactivated working cycle.
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Specification