METHODS AND SYSTEM FOR IMPROVING EFFICIENCY OF A HYBRID VEHICLE
First Claim
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1. A powertrain operating method, comprising:
- distributing a driver demand torque request between an engine and a motor responsive to a first battery charging curve and a first battery discharge curve while not operating a vehicle in cruise control mode; and
distributing the driver demand torque request between the engine and the motor responsive to a second battery charging curve and a second battery discharging curve while operating the vehicle in cruise control mode.
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Abstract
Systems and methods for operating a hybrid powertrain that includes an engine and a motor/generator are described. The systems and methods adjust battery charging and discharging as well as engine and motor torque based on whether or not the vehicle is operating in a cruise control mode. In one example, curves that provide a basis for operating an engine and motor based on driver demand torque are compressed during a vehicle cruise control mode to improve powertrain efficiency.
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Citations
20 Claims
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1. A powertrain operating method, comprising:
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distributing a driver demand torque request between an engine and a motor responsive to a first battery charging curve and a first battery discharge curve while not operating a vehicle in cruise control mode; and distributing the driver demand torque request between the engine and the motor responsive to a second battery charging curve and a second battery discharging curve while operating the vehicle in cruise control mode. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A powertrain operating method, comprising:
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activating a first battery charging and discharging strategy when not operating a vehicle in cruise control mode; and activating a second battery charging and discharging strategy when operating the vehicle in cruise control mode. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A system, comprising:
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an engine; a motor/generator; a disconnect clutch positioned in a powertrain between the engine and the motor; a transmission coupled to the motor/generator; and a controller including executable instructions stored in non-transitory memory to downshift a transmission from a gear at a first driver demand torque while a vehicle is operated in a cruise control mode and downshift the transmission from the gear at a second driver demand torque while the vehicle is not operated in the cruise control mode. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification