Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
May 17, 2016
Patent Application Number
14566153
Date Filed
December 10, 2014
Patent Citations Received
Patent Primary Examiner
Patent abstract
A method of operating a hybrid electric vehicle coordinates operation of an internal combustion engine, a motor, and friction brakes to mitigate a driveline lash crossing without delaying generation of negative torque. In response to a request to transition from positive torque to negative torque, the engine and motor are controlled to rapidly reduce powertrain torque to a small positive value, slowly reduce powertrain torque through the driveline lash zone, and then rapidly reduce powertrain torque to the target. To avoid delay, the friction brakes are applied in a coordinated manner to supply the negative torque during the transition.
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