Systems and methods for hybrid vehicle launch
First Claim
1. A method for a hybrid vehicle comprising:
- controlling a capacity of a clutch configured to transmit torque between an engine and a transmission, and an output of an electric motor positioned in a driveline of the hybrid vehicle during a vehicle launch to emulate a performance of a torque converter positioned in the driveline of the hybrid vehicle, under conditions where the hybrid vehicle does not include the torque converter.
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Accused Products
Abstract
Methods and systems are provided for operating a vehicle driveline where the vehicle driveline does not include a torque converter. In one example, a method comprises controlling a capacity of a clutch configured to transmit torque between an engine and a transmission, and an output of an electric motor positioned in a driveline of the hybrid vehicle during a vehicle launch to emulate a performance of a torque converter positioned in the driveline of the vehicle. In this way, vehicle launch maneuvers may be conducted for vehicles that are equipped with a clutch and an electric motor, such that said launch maneuvers mimic those of a vehicle with a torque converter, which may improve customer satisfaction and improve engine efficiency.
16 Citations
20 Claims
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1. A method for a hybrid vehicle comprising:
controlling a capacity of a clutch configured to transmit torque between an engine and a transmission, and an output of an electric motor positioned in a driveline of the hybrid vehicle during a vehicle launch to emulate a performance of a torque converter positioned in the driveline of the hybrid vehicle, under conditions where the hybrid vehicle does not include the torque converter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for a vehicle, comprising:
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an engine including a crankshaft mechanically coupled to the engine; a transmission positioned in a driveline downstream of the engine, the transmission configured with at least a clutch configured to transmit engine torque to one or more wheels via the transmission; one or more transmission input shafts; an electric motor positioned in the driveline; and a controller, storing instructions in non-transitory memory that, when executed, cause the controller to; control a capacity of the clutch and an output of the electric motor via a model that simulates a torque converter in the driveline, the model including denoting a portion of the driveline upstream of the clutch as an impeller of the torque converter and denoting another portion of the driveline downstream of the clutch as a turbine of the torque converter, where the model includes defining a simulated impeller input torque as a ratio of an impeller speed squared to a k-factor squared, defining a simulated turbine output torque as the impeller input torque multiplied by a torque ratio, where both the k-factor and the torque ratio are defined as one of either a constant, a function of a slip speed of the clutch, or other parameter; wherein a measured speed of the crankshaft mechanically coupled to the engine is used as the impeller speed in the model and wherein an input shaft speed of a transmission input shaft of the one or more transmission input shafts is used as a turbine speed of the torque converter; and wherein the k-factor and the torque ratio are a function of a ratio between the input shaft speed and the crankshaft speed. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A driveline operating method for a controlling an electric motor and a clutch that transmits torque between an engine and a transmission during a vehicle launch, comprising:
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(a) using a model of the clutch and the electric motor that includes relationships of a speed of a crankshaft mechanically coupled to the engine and an input shaft speed of a transmission input shaft to determine a capacity of the clutch and an output of the electric motor; and (b) controlling the clutch to a desired capacity and the output of the electric motor to a desired output based on the model. - View Dependent Claims (17, 18, 19, 20)
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Specification