Methods and system for starting an engine
Systems and methods for operating a hybrid powertrain or driveline that includes an engine and an integrated starter/generator are described. In one example, the integrated starter/generator may crank the engine via a pinion gear during a first engine start. The integrated starter/generator may crank the engine via a belt during a second engine start.
1. A powertrain operating method, comprising:
disengaging a spline collar from a belt pulley during a first engine start, the belt pulley mechanically coupled to a shaft of an integrated starter/generator, the belt pulley coupled to an engine crankshaft pulley;
engaging the spline collar to the belt pulley during a second engine start; and
cranking an engine via the belt pulley and the integrated starter/generator during the second engine start.
2. The method of claim 1 , where the engine is cranked via the integrated starter/generator during the first engine start.
3. The method of claim 1 , further comprising opening a BISG control clutch during the second engine start.
4. The method of claim 1 , further comprising closing the BISG control clutch during the first engine start.
5. The method of claim 4 , further comprising cranking the engine via a pinion gear and a flywheel during first engine start.
6. The method of claim 1 , where the spline collar is engaged and disengaged via a solenoid.