US 11,932,112 B1
Vehicle and corresponding powertrain control system
Corey James Blue, Belleville, MI (US); Samuel Melville Glauber, McLean, VA (US); Timothy Baxendale, Portales, NM (US); and Bradley D Riedle, Northville, MI (US)
Assigned to Ford Global Technologies, LLC, Dearborn, MI (US)
Filed by FORD GLOBAL TECHNOLOGIES, LLC, Dearborn, MI (US)
Filed on May 4, 2023, as Appl. No. 18/312,007.
Int. Cl. B60W 20/40 (2016.01); B60K 6/387 (2007.10)
CPC B60K 6/387 (2013.01) [B60W 20/40 (2013.01); B60W 2510/0275 (2013.01); B60W 2710/083 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A vehicle comprising:
a powertrain having an engine and an electric machine each configured to generate power to propel the vehicle;
a disconnect clutch (i) disposed between the engine and the electric machine, (ii) configured to open to disconnect the engine from a remainder of the powertrain, and (iii) configured to close to connect the engine to the remainder of the powertrain; and
a controller programmed to, in response to a command to start the engine,
close the disconnect clutch to transfer power from the electric machine to the engine to start the engine,
control a torque capacity of the disconnect clutch during the engine start according to a feedforward model of a pressure applied to the disconnect clutch, and
control a torque of the electric machine based on an adjusted torque capacity of the disconnect clutch in response to (i) the pressure applied to the disconnect clutch decreasing according to a ramp down phase during the engine start, (ii) a difference between (a) the pressure applied to the disconnect clutch according to the feedforward model and (b) a measured pressure of the disconnect clutch increasing to greater than a first threshold, and (iii) a rate of change of the pressure applied to the disconnect clutch decreasing to less than a second threshold, wherein the adjusted torque capacity of the disconnect clutch is based on the feedforward model of the pressure applied to the disconnect clutch and an offset value.