Boosted engine control responsive to driver selected performance
Various systems and methods are described for operating an engine in a vehicle in response to a driver performance/economy mode. One example method comprises delivering a first fuel to a cylinder of the engine from a first injector, delivering a second, different, fuel to the cylinder of the engine from a second injector, varying a relative amount of said first and second fuel as an operating condition varies; and adjusting delivery of at least said second fuel based on a driver-selected performance mode.
1. A method for operating a vehicle's boosted engine and transmission, comprising:
delivering a first fuel to a cylinder of the engine from a first injector;
delivering a second, different, fuel to the cylinder of the engine from a second injector,
varying a relative amount of said first and second fuel as an operating condition varies; and
adjusting delivery of said second fuel, a transmission shift-schedule, and a minimum boost based on a driver-selected performance mode.
2. The method of claim 1 where the second fuel has a greater heat of vaporization than the first fuel.
3. The method of claim 1 where the second fuel includes alcohol, and where the second fuel is directly injected to the cylinder.
4. The method of claim 3 where the first fuel is port injected to the cylinder.
5. The method of claim 1 where delivery of the first and second fuels is adjusted based on the driver-selected performance mode, and where said adjusting includes increasing the relative amount of the second fuel during an increased vehicle performance mode, and decreasing the relative amount of the second fuel during an increased fuel economy mode.
6. The method of claim 5 further comprising adjusting feedback adjustment of the second fuel based on the driver-selected performance mode.
7. The method of claim 6 wherein the boost operation adjustment includes increasing a minimum boost of a turbocharger during the increased vehicle performance mode, and decreasing the minimum boost during the increased fuel economy mode.
8. The method of claim 1 wherein the operating condition includes engine load.
9. A method for operating a vehicle's engine cylinder, comprising:
delivering a first fuel to the cylinder from a first injector;
delivering a second fuel to the cylinder from a second, direct, injector;
varying a relative amount of said first and second fuel as an engine boost varies; and
adjusting the boosting by increasing a minimum boost during an increased vehicle performance mode, and decreasing the minimum boost during an increased fuel economy mode.
10. The method of claim 9 where delivery of the first and second fuels is adjusted based on a driver-selected performance mode, and where said adjusting includes increasing the relative amount of the second fuel during the increased vehicle performance mode, and decreasing the relative amount of the second fuel during the increased fuel economy mode.
11. The method of claim 10 wherein the minimum boost is maintained by increasing exhaust gas temperature via a late fuel injection from direct injection of the second fuel.
12. The method of claim 11 where the second fuel has a greater heat of vaporization than the first fuel.
13. The method of claim 12 where the second fuel includes alcohol.
14. The method of claim 13 where the first fuel is port injected to the cylinder.
15. The method of claim 9 further comprising increasing feedback adjustment of the second fuel during the increased vehicle performance mode.
16. A method for a vehicle's boosted engine cylinder and transmission, comprising:
delivering a first fuel to the cylinder from a first injector;
delivering a second, different, fuel to the cylinder from a second, direct, injector,
varying a relative amount of said first and second fuel as an operating condition varies; and
adjusting delivery of said second fuel, a transmission shift-schedule and torque converter lock-up schedule, and a minimum boost based on a driver-selected performance mode.