Methods and systems are provided for engine torque control. Mutually exclusive airflow adjustments and spark adjustments are used to provide accurate engine torque control when operating near combustion stability limits. Torque offset values and proportional-integral control terms are adjusted respo
Methods and systems are provided for engine torque control. Mutually exclusive airflow adjustments and spark adjustments are used to provide accurate engine torque control when operating near combustion stability limits. Torque offset values and proportional-integral control terms are adjusted responsive to tip-in/tip-out events to improve torque control response times.
대표청구항▼
1. A method of controlling vehicle torque, comprising: controlling vehicle speed during engine combustion operation while engine speed is not being feedback controlled, andtransitioning from air adjustment to spark adjustment to maintain actual engine torque at a desired engine torque when operating
1. A method of controlling vehicle torque, comprising: controlling vehicle speed during engine combustion operation while engine speed is not being feedback controlled, andtransitioning from air adjustment to spark adjustment to maintain actual engine torque at a desired engine torque when operating at or near a minimum aircharge for combustion stability. 2. The method of claim 1, wherein the vehicle is a hybrid electric vehicle. 3. The method of claim 1, wherein the controlling vehicle speed during engine combustion operation while engine speed is not being feedback controlled includes a tip-out event and a tip-in event. 4. The method of claim 1, wherein the air adjustment includes decreasing a throttle opening based on an adjusted torque error while maintaining spark at MBT before reaching a minimum airflow, and only upon reaching the minimum airflow, further maintaining torque by adjusting spark. 5. The method of claim 4, wherein the spark adjustment includes retarding spark ignition timing from MBT based on the adjusted torque error while maintaining a throttle at a minimum airflow position. 6. The method of claim 5, wherein the adjusted torque error is based on a difference between the desired engine torque and the actual engine torque, and further based on a stored torque offset, the offset corresponding to an actual engine speed and load. 7. The method of claim 6, wherein the adjusted torque error based on the difference includes the adjusted torque error being based on a proportional-integral controlled difference wherein the difference is adjusted with a stored proportional term and a stored integral term. 8. The method of claim 7, wherein in response to a tip-in or a tip-out event, each of the proportional term and the integral term is reset to zero. 9. The method of claim 1, wherein the air adjustment is closed loop on torque, and wherein the spark adjustment is closed loop on torque. 10. The method of claim 9, wherein the air adjustment and the spark adjustment are mutually exclusive. 11. A method of controlling vehicle torque, comprising: controlling vehicle speed during engine combustion operation while engine speed is not being feedback controlled and responsive to a tip-out, andtransitioning from closed-loop air adjustment to closed-loop spark adjustment to maintain actual torque at a desired engine torque when operating at a minimum air charge for combustion stability. 12. The method of claim 11, wherein during the closed-loop air adjustment, spark ignition timing is maintained at MBT until a minimum airflow is reached. 13. The method of claim 12, further comprising, after reaching the minimum airflow, spark timing is adjusted to maintain the actual torque at the desired engine torque. 14. The method of claim 13, wherein during the closed-loop spark adjustment, a throttle is maintained at a minimum air charge position. 15. The method of claim 11, wherein the vehicle is a hybrid-electric vehicle. 16. The method of claim 11, wherein each of the closed-loop air adjustment and closed-loop spark adjustment is based on a torque offset value, the torque offset value determined responsive to an actual engine speed and actual engine load. 17. A system for controlling a vehicle powertrain comprising: an engine;a transmission;an electric machine coupled to the engine via a gearset;a battery configured to power the electric machine;a controller having computer readable instructions for: determining a torque error based on a desired engine torque relative to an actual engine torque;adjusting the torque error using a stored torque offset corresponding to an actual engine speed and load;closed-loop adjusting a throttle position, and not a spark ignition timing, based on the adjusted torque error to provide the desired torque until a threshold airflow is reached, wherein the threshold airflow is a minimum airflow below which engine combustion stability is limited; andclosed-loop adjusting a spark ignition timing, and not a throttle position, based on the adjusted torque error to provide the desired torque below the threshold airflow. 18. The system of claim 17, wherein the closed-loop adjusting of a spark ignition timing is performed down to and including torque at a minimum airflow. 19. The system of claim 17, wherein the determining a torque error includes determining a proportional-integral controlled torque error via application of a stored proportional term and a stored integral term, and wherein the controller includes instructions for clearing the stored proportional term and the stored integral term in response to one of a tip-in and a tip-out event.
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