Systems and methods for optimization and control of internal combustion engine starting
First Claim
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1. A method, comprising:
- maintaining a plurality of engine speed profiles for starting an internal combustion engine of a vehicle;
selecting a target engine speed profile from the plurality of engine speed profiles based on operator inputs from an operator of the vehicle and operating parameters of the vehicle, wherein selecting the target engine speed profile further includes determining an engine crank revolution count provided by the target engine speed profile satisfies a minimum crank revolution count before starting the engine;
driving the internal combustion engine with a starter motor in response to selecting the target engine speed profile;
determining an instantaneous engine speed during the starting duration;
regulating the speed of the internal combustion engine during the starting duration in response to the instantaneous engine speed to substantially conform the speed of the internal combustion engine with the target speed profile; and
starting the internal combustion engine in response to the speed of the internal combustion engine reaching a target speed of the target speed profile.
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Abstract
An engine starting system and technique include selecting a target engine speed profile from a plurality of engine speed profiles based on operator inputs and operating parameters of the vehicle. A feedback control strategy is used to substantially conform the engine speed with the target speed profile during starting until a target speed is reached in which fueling is initiated to start the engine.
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Citations
26 Claims
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1. A method, comprising:
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maintaining a plurality of engine speed profiles for starting an internal combustion engine of a vehicle; selecting a target engine speed profile from the plurality of engine speed profiles based on operator inputs from an operator of the vehicle and operating parameters of the vehicle, wherein selecting the target engine speed profile further includes determining an engine crank revolution count provided by the target engine speed profile satisfies a minimum crank revolution count before starting the engine; driving the internal combustion engine with a starter motor in response to selecting the target engine speed profile; determining an instantaneous engine speed during the starting duration; regulating the speed of the internal combustion engine during the starting duration in response to the instantaneous engine speed to substantially conform the speed of the internal combustion engine with the target speed profile; and starting the internal combustion engine in response to the speed of the internal combustion engine reaching a target speed of the target speed profile. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 25)
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11. A method, comprising:
operating a vehicle with a powertrain to satisfy a driver torque demand, and while operating the vehicle; selecting a target engine speed profile from a plurality of engine speed profiles stored in a controller of the vehicle, wherein selecting the target speed profile includes interpreting operator inputs and operating parameters of the vehicle with the controller to determine the target speed profile, wherein selecting the target engine speed profile further includes determining an engine crank condition of the target speed profile satisfies a minimum number of engine crank revolutions before fueling the internal combustion engine; providing a control command to a starter motor to drive the internal combustion engine according to the target speed profile over a starting duration; determining the instantaneous engine speed during the starting duration; modifying the control command during the starting duration, to regulate the speed of the internal combustion engine to substantially conform with the target speed profile based on the instantaneous speed determination; and fueling the internal combustion engine when an actual speed of the internal combustion engine is within a region around a first threshold target speed of the target speed profile. - View Dependent Claims (12, 13, 14, 15, 26)
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16. A system, comprising:
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a powertrain including an internal combustion engine having an output shaft; at least one starter motor operable to rotate the output shaft of the internal combustion during starting of the internal combustion engine; a controller in communication with the internal combustion engine and the starter motor configured to initiate starting of the internal combustion engine, the controller comprising; an engine speed profile selection module configured to determine a target speed profile for starting the internal combustion engine, wherein the engine speed profile selection module is further configured interpret operator inputs and operating parameters of the internal combustion engine to select the target speed profile from a plurality of engine speed profiles stored in a memory of the controller, wherein the engine speed profile selection module is further configured to determine an engine crank revolution count in response to an engine crank angle, a total engine cranking process time, and an engine cranking starting time and to determine the engine crank revolution count of the target engine speed profile satisfies a minimum crank revolution count for starting the engine; and a starter motor command module configured to determine a control command for the starter motor to rotate the output shaft of the internal combustion engine in response to the selected target speed profile, wherein the starter motor command module is configured to regulate the control command over a starting duration in response to an instantaneous engine speed determination to substantially conform the speed of the internal combustion engine with the target speed profile during the starting duration. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24)
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Specification