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US 2018/0022353 A1Published application
Methods and system for starting an engine
AssigneeFord Global Technologies, LLC
InventorsScott James Thompson, Todd McCullough
Life of this patent
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Abstract
Systems and methods for starting an engine of a hybrid powertrain or driveline that includes an engine and a driveline disconnect clutch are described. In one example, a motor/generator rotates one side of an open driveline disconnect clutch that is coupled to a transmission, and then closes the open driveline disconnect clutch in response to motor/generator acceleration being less than a threshold.
Claims20
A powertrain operating method, comprising:
- commanding a motor to a speed via a controller in response to an engine start request;
- and
- closing a driveline disconnect clutch via the controller in response to acceleration of the motor being less than a threshold after commanding the motor to the speed.
A powertrain operating method, comprising:
- commanding a motor to a speed via a controller, the speed based on an available amount of power that may be supplied by an electrical energy storage device at a time of an engine start request;
- and
- closing a driveline disconnect clutch via the controller in response to acceleration of the motor being less than a threshold a predetermined amount of time after commanding the motor to the speed.
A system, comprising:
- an engine;
- a transmission coupled to the engine;
- a first motor/generator coupled to the engine via a belt;
- a second motor/generator positioned in a driveline between the engine and the transmission;
- a disconnect clutch positioned in a driveline between the engine and the second motor/generator;
- an electric energy storage device electrically coupled to the second motor/generator;
- and
- a vehicle system controller including executable instructions stored in non-transitory memory to start the engine in a first mode via closing the driveline disconnect clutch in response to a the electrical energy storage device supplying power to the second motor/generator at a maximum power output limit of the electrical energy storage device and speed of the second motor/generator being within a threshold speed of a maximum speed of the second motor/generator when the second motor/generator is supplied electrical power at the maximum power output limit of the electrical energy storage device.
5 more elements
Dependencies are inferred from the claim text.