Control of selectable one-way clutch in a transmission

Method for controlling a vehicular powertrain comprising an electro-mechanical transmission including a selectable one-way clutch mechanically-operatively coupled to an internal combustion engine and configured to selectively transmit mechanical power to an output member, said method comprising:

• monitoring a vehicle speed;
• comparing said vehicle speed to a threshold low speed range
• monitoring a transmission gear state;
• monitoring a requested transmission gear state;
• monitoring a pedal input;
• when said transmission gear state is a first gear state and said vehicle speed remains within said threshold low speed range, a neutral state, or a reverse state:
• maintaining said selectable one-way clutch in said engaged mode based upon an absence of a vehicle launch condition, wherein the absence of the vehicle launch condition is based on the monitored pedal input, and otherwise disengaging said selectable one-way clutch;
• when said transmission gear state is a drive state, when said requested transmission gear state is the reverse state, and said vehicle speed is less than a threshold creep speed, commanding a rolling garage shift, comprising:
• operating a selectable one-way clutch in an engaged mode,
• shifting other clutches within said transmission from a drive gear state to a reverse gear state;
• and
• when one of said vehicle speed is in the forward direction in excess of said threshold low speed range, the vehicle launch condition is determined based on said pedal input and a desired vehicle coasting into a higher gear state is determined, transitioning said selectable one-way clutch from an engaged mode into a disengaged mode.