Vehicle and corresponding powertrain control system

A vehicle comprising:

• an engine and an electric machine each configured to generate power to propel the vehicle;
• a clutch disposed between the engine and the electric machine;
• and
• a controller programmed to, in response to an engine start,
• close the clutch to transfer power from the electric machine to the engine to start the engine,
• control a torque capacity of the clutch during the engine start according to a model of a pressure applied to the clutch, and
• control a torque of the electric machine based on an adjusted torque capacity of the clutch in response to (i) the pressure applied to the clutch decreasing according to a ramp down phase during the engine start and (ii) a difference between (a) the pressure applied to the clutch according to the model and (b) a measured pressure of the clutch increasing to greater than a threshold, wherein the adjusted torque capacity of the clutch is based on the model of the pressure applied to the clutch and an offset value.

A vehicle comprising:

• an engine and an electric machine each configured to generate power to propel the vehicle;
• a clutch disposed between the engine and the electric machine;
• and
• a controller programmed to, in response to an engine start,
• close the clutch to transfer power from the electric machine to the engine to start the engine,
• control a torque capacity of the clutch during the engine start according to a model of a pressure applied to the clutch, and
• control a torque of the electric machine based on an adjusted torque capacity of the clutch in response to (i) the pressure applied to the clutch decreasing according to a ramp down phase during the engine start and (ii) a rate of change of the pressure applied to the clutch decreasing to less than a threshold, wherein the adjusted torque capacity of the clutch is based on the model of the pressure applied to the clutch and an offset value.