Methods and system for operating a driveline
Systems and methods for operating a driveline of a hybrid vehicle are described. In one example, a torque that is produced by an engine is adjusted responsive to a transmission oil temperature and a speed of a torque converter impeller so that temperature of oil in a transmission lube circuit may be maintained at a desired temperature.
1. A driveline operating method, comprising:
increasing torque of an engine and a driveline disconnect clutch pressure responsive to increasing an amount of charge supplied to a battery via an electric machine while a vehicle which includes the engine is stopped;
adjusting engine torque responsive to the amount of charge supplied to the battery when a transmission oil pressure is not in a priority zone; and
adjusting engine torque responsive to a transmission oil temperature and a speed of a torque converter impeller speed when the transmission oil pressure is in the priority zone.
2. The method of claim 1 , where the priority zone is where a portion of transmission pump output is directed according to a priority.
3. The method of claim 2 , where the priority increases flow to the driveline disconnect clutch and decreases flow to a transmission oil heat exchanger.
4. The method of claim 1 , where adjusting engine torque include decreasing engine torque.
5. The method of claim 1 , further comprising decreasing the amount of charge supplied to the battery when the transmission oil pressure is in the priority zone.
6. The method of claim 1 , further comprising adjusting the transmission oil pressure responsive to an operating state of a torque converter.
7. The method of claim 1 , where adjusting engine torque includes adjusting an engine throttle position.