Method and system for controlling driveline lash in a hybrid vehicle

摘要

A vehicle has an engine, an upstream clutch, an electric machine, a downstream clutch, a transmission gearbox, and a controller. The controller is configured to: (i) control engagement of the downstream clutch, (ii) monitor a vehicle torque, and (iii) control electric machine torque to a designated rate when the vehicle torque changes direction and the electric machine is operating. A method for controlling a hybrid vehicle includes engaging a clutch downstream of the electric machine, monitoring a vehicle torque, and controlling electric machine torque to a designated rate when vehicle torque changes direction and the electric machine is operating. A hybrid vehicle system has an electric machine and a controller configured to (i) control electric machine torque to a designated rate within a time zone, and (ii) control at least one of the electric machine torque and an engine torque to meet driver demand outside of the zone.

主权项

1. A vehicle comprising:
an electric machine connected to an engine by an upstream clutch and connected to a transmission gearbox by a torque converter and a bypass, downstream clutch; and a controller configured to reduce lash in a driveline by controlling a torque of the electric machine to a designated rate of change within a time zone characterized by a vehicle torque changing direction and being substantially zero, and the electric machine is operating.