IMPLEMENTING SKIP FIRE WITH START/STOP FEATURE
First Claim
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 desired 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 wherein the working chambers are arranged to be hydraulically deactivated using oil pressure and the oil pressure is raised before firing any working chambers so that skipped working chambers can be deactivated.
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Accused Products
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
21 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 desired 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 wherein the working chambers are arranged to be hydraulically deactivated using oil pressure and the oil pressure is raised before firing any working chambers so that skipped working chambers can be deactivated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A hybrid powertrain controller for a vehicle that is arranged to implement 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 hybrid powertrain controller comprising:
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an engine start/stop management unit that is arranged to help implement a start/stop feature in a skip fire/engine control system, the start/stop feature involving automatically turning off the engine under selected circumstances during a vehicle drive cycle; an integrated starter-generator that is arranged to apply torque to a powertrain such that an engine speed threshold is reached wherein the application of torque is performed during restart after the turning off of the engine; and a firing control unit that is arranged to operate the engine in a skip fire manner after the engine speed threshold is reached. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A method for implementing a start/stop feature in a skip fire engine control system, the engine having a plurality of working chambers, the method comprising:
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implementing a start/stop feature that involves automatically turning off the engine under selected circumstances during a vehicle drive cycle wherein the turning off of the engine allows the manifold absolute pressure to increase and substantially equilibrate with atmospheric pressure; determining that the turned off engine should be restarted; and restarting and operating the engine using a firing fraction, the firing fraction being dynamically adjusted based on the manifold absolute pressure and wherein the adjustment of the firing fraction is used to help reduce an engine speed surge caused by the manifold absolute pressure increase.
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21. A method of operating hybrid powertrain controller for a vehicle that is arranged to implement a start/stop feature in a skip fire engine control system, the method comprising;
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implementing a start/stop feature that involves automatically turning off the engine while the vehicle is in motion wherein the turning off of the engine allows the manifold absolute pressure to increase and substantially equilibrate with atmospheric pressure; 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 desired 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 the vehicle never stops between the engine turn off and the engine restart.
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Specification