Launch control of hybrid electric vehicle having a torque converterless driveline
First Claim
1. A method for controlling a vehicle powertrain including a transmission having an input speed, an internal combustion engine having an output and a throttle position, and an input clutch having a variable torque capacity for driveably connecting the input and output, the method comprising the steps of:
- determining a current input speed;
determining a value representing requested powertrain output;
producing an indication that a vehicle launch condition has been initiated;
determining a target input speed based on the value representing requested powertrain output;
determining a variable pressure for actuating the input clutch during the launch condition based on a difference between the current input speed and the target input speed; and
using the variable pressure to control the torque capacity of the input clutch during the launch condition.
2 Assignments
0 Petitions
Accused Products
Abstract
A powertrain assembly for an automotive vehicle having an internal combustion engine, transmission, electric induction motor, a clutch for connecting and releasing the engine and transmission, and a controller for controlling the state of engagement and disengagement of the clutch and the torque produced by the motor during the launch. The engine increases torque produced by the induction motor during a vehicle launch condition, permitting the engine to be turned off when the vehicle is at rest. The torque multiplication that would normally be available from a hydrokinetic torque converter is replaced with auxiliary launch torque supplied by the induction motor.
20 Citations
22 Claims
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1. A method for controlling a vehicle powertrain including a transmission having an input speed, an internal combustion engine having an output and a throttle position, and an input clutch having a variable torque capacity for driveably connecting the input and output, the method comprising the steps of:
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determining a current input speed; determining a value representing requested powertrain output; producing an indication that a vehicle launch condition has been initiated; determining a target input speed based on the value representing requested powertrain output; determining a variable pressure for actuating the input clutch during the launch condition based on a difference between the current input speed and the target input speed; and using the variable pressure to control the torque capacity of the input clutch during the launch condition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 16)
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10. A method for controlling a vehicle powertrain including a transmission having an input speed, an internal combustion engine having an output and a throttle position, a motor, and an input clutch having a variable torque capacity for driveably connecting the input and output, the method comprising the steps of:
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determining a current input speed; determining a value representing requested powertrain output; producing an indication that a vehicle launch condition has been initiated; determining a target input speed based on the value representing requested powertrain output; determining a variable pressure for actuating the input clutch during the launch condition based on a difference between the current input speed and the target input speed; using the variable pressure to control the torque capacity of the input clutch during the launch condition; determining the current gear in which the transmission is operating; determining a target motor output torque based on the current gear and throttle position; and using the target motor output torque to control the torque produced by the motor. - View Dependent Claims (11, 12, 13, 14, 15)
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17. A method for controlling a vehicle powertrain including a transmission having an input speed, an electric motor producing torque that drives the input, an internal combustion engine having an output and throttle position, an input clutch having a variable torque capacity for driveably connecting the input and output, and an electronic controller communicating with the transmission and motor, the method comprising the steps of:
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repetitively determining the current input speed; repetitively determining the engine throttle position; generating a signal that a vehicle launch condition has been initiated; repetitively determining a target input speed based on the engine throttle position; repetitively determining a variable pressure for actuating the input clutch during the launch condition based on a difference between the current input speed and the target input speed; and generating a command to change a pressure at the input clutch based on the determined variable pressure, whereby torque capacity of the input clutch changes during the launch condition. - View Dependent Claims (18, 19, 20, 21, 22)
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Specification