Methods and systems are provided for synergizing the benefits of a multi-fuel engine in a hybrid vehicle system. During engine operation, in response to a change in driver demand, the controller may opt to switch fuels or maintain a current fuel while using stored power assist. The selection may be
Methods and systems are provided for synergizing the benefits of a multi-fuel engine in a hybrid vehicle system. During engine operation, in response to a change in driver demand, the controller may opt to switch fuels or maintain a current fuel while using stored power assist. The selection may be based on the combination of fuel and stored power offset that provides the highest engine efficiency at the lowest fuel cost.
대표청구항▼
1. A method for a hybrid vehicle, comprising: propelling the vehicle via an engine combusting a first fuel and a second, different fuel selected based on driver demand; andin response to a change in driver demand, adjusting relative usage of the first fuel and the second fuel based on each of the ch
1. A method for a hybrid vehicle, comprising: propelling the vehicle via an engine combusting a first fuel and a second, different fuel selected based on driver demand; andin response to a change in driver demand, adjusting relative usage of the first fuel and the second fuel based on each of the change in driver demand and a state of charge of an energy storage system via selecting between maintaining usage of the first fuel and transitioning to the second fuel based on a cost usage of the first fuel relative to a cost usage of the second fuel, and where the adjusting is further based on the cost usage of each of the first fuel and the second fuel with a stored power offset based on the state of charge. 2. The method of claim 1, wherein the stored power offset applied with usage of the first fuel is different from the stored power offset applied with usage of the second fuel. 3. The method of claim 1, wherein the stored power offset includes one of an increase in the state of charge via charging of the energy storage system using engine torque, and a decrease in the state of charge via discharging of stored power to supplement the engine torque. 4. The method of claim 1, wherein the selecting further includes transitioning to usage of the second fuel when the cost of usage of the second fuel with the stored power offset is lower than the cost of usage of the first fuel with the stored power offset by more than a threshold amount. 5. The method of claim 4, wherein the selecting further includes maintaining usage of the first fuel when the cost of usage of the second fuel with the stored power offset is lower than the cost of usage of the first fuel with the stored power offset by less than a threshold amount. 6. The method of claim 1, further comprising, when maintaining usage of the first fuel, compensating for a deficit in the driver demand via torque from a motor coupled to the energy storage system. 7. The method of claim 1, further comprising, in response to selecting the first fuel, operating the engine with a first adjusted speed-load profile while maintaining a power level of the vehicle using motor torque, and in response to selecting the second fuel, operating the engine with a second adjusted speed-load profile while maintaining the power level of the vehicle using motor torque. 8. The method of claim 1, wherein the first fuel is a high octane fuel including ethanol, and wherein the second fuel is a low octane fuel including gasoline. 9. The method of claim 1, wherein the first fuel is a gaseous fuel including compressed natural gas, and wherein the second fuel is a liquid fuel including at least gasoline. 10. The method of claim 9, wherein using the first fuel in the engine includes direct injecting the first fuel and wherein using the second fuel in the engine includes port injecting the second fuel. 11. A method for a hybrid vehicle, comprising: propelling the vehicle via an engine using a first fuel selected based on driver demand; andin response to a change in driver demand, comparing, for the change in driver demand, a first value of fuel cost for operating with the first fuel with a first amount of stored power offset to a second value of fuel cost for operating with a second, different fuel with a second, different amount of stored power offset; andmaintaining usage of the first fuel when the first value is lower than the second value; andtransitioning to usage of the second fuel when the first value is higher than the second value to deliver the changed driver demand. 12. The method of claim 11, further comprising selecting the first and second amounts of stored power offset based on each of a state of charge of an energy storage system, an octane rating of the first and second fuels, a cost of the first and second fuels, and the change in driver demand. 13. The method of claim 11, wherein the change in driver demand is a drop in driver demand, and wherein during the drop in driver demand, the first amount of stored power offset is larger than the second amount of stored power offset, and usage of the first fuel is maintained responsive to the first value being lower than the second value. 14. The method of claim 11, wherein the change in driver demand is a rise in driver demand, and wherein during the rise in driver demand, the second amount of stored power offset is larger than the first amount of stored power offset, and usage of the second fuel is transitioned to responsive to the second value being lower than the first value. 15. The method of claim 11, further comprising, while maintaining usage of the first fuel, holding the engine in a first adjusted engine speed-load profile via motor torque adjustments, and while transitioning to usage of the second fuel, holding the engine in a second adjusted engine speed-load profile via motor torque adjustments, wherein an octane rating of the first fuel is higher than an octane rating of the second fuel, and wherein the first adjusted engine speed-load profile includes a lower speed and a higher load while the second adjusted engine speed-load profile includes a higher speed and a lower load. 16. A hybrid vehicle system, comprising: a motor powered via an energy storage system;an internal combustion engine including a cylinder;a first fuel injector for injecting a first fuel into the cylinder;a second fuel injector for injecting a second fuel into the cylinder;vehicle wheels propelled via one or more of motor torque and engine torque;a pedal position sensor for receiving an operator torque demand; anda controller with computer-readable instructions stored on non-transitory memory for: responsive to a first change in operator torque demand, comparing each of a first value of fuel cost for operating with the first fuel with a first amount of stored power offset to a second value of fuel cost for operating with the second fuel with a second amount of stored power offset and maintaining injection of the first fuel while changing a state of charge of the energy storage system by a first amount to meet the first change in operator torque demand, where the first value is lower than the second value; andresponsive to a second, different change in operator torque demand, comparing each of a third value of fuel cost for operating with the first fuel with a third amount of stored power offset to a fourth value of fuel cost for operating with the second fuel with a fourth amount of stored power offset and shifting to injection of the second fuel while changing the state of charge of the energy storage system by a second, different amount to meet the second change in operator torque demand, where the third value is greater than the fourth value. 17. The system of claim 16, wherein the first change in operator torque demand is a decrease in demand and changing the state of charge of the energy storage system by the first amount includes charging the energy storage system, and wherein the second change in operator torque demand is an increase in demand and changing the state of charge of the energy storage system by the second amount includes discharging the energy storage system. 18. The system of claim 16, wherein the controller includes further instructions for: while maintaining injection of the first fuel, operating the engine in a first engine speed-load profile while maintaining a power level; andwhile shifting to injection of the second fuel, operating the engine in a second engine speed-load profile while maintaining the power level.
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이 특허에 인용된 특허 (49)
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