Delaying lash crossing for a modular hybrid transmission
First Claim
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1. A method of controlling an electrified vehicle powertrain comprising:
- producing a first torque in an unpowered electric machine by rotating a machine input, causing regenerative braking to slow the input below an engine idle speed to a non-zero target speed;
powering the machine at the target speed to produce a second torque, opposite the first torque, and lash cross the input;
maintaining the target speed below the idle speed until receiving a torque request.
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Abstract
A method of controlling lash crossing in a hybrid electric automotive powertrain. During deceleration while the powertrain is operating in electric only mode, an input is slowed to a first speed lower than an idle speed of an internal combustion engine. Lash crossing is delayed until the input has slowed to the first speed. When the first speed is zero, lash crossing is delayed until receipt of an acceleration request.
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Citations
14 Claims
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1. A method of controlling an electrified vehicle powertrain comprising:
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producing a first torque in an unpowered electric machine by rotating a machine input, causing regenerative braking to slow the input below an engine idle speed to a non-zero target speed; powering the machine at the target speed to produce a second torque, opposite the first torque, and lash cross the input; maintaining the target speed below the idle speed until receiving a torque request. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of controlling an electrified vehicle powertrain comprising:
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charging a battery by rotating an input, producing a first torque in an unpowered electric machine; slowing rotation of the input below an engine idle speed to a target speed; delaying, until the target speed is reached, powering the machine to produce a second torque, opposite the first torque, and lash crossing the input; operating the machine at the target speed until receiving a torque request. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A method of controlling an electrified vehicle powertrain comprising:
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charging a battery of an automotive powertrain by rotating an input to produce a first torque in an unpowered electric machine; slowing rotation of the input below an engine idle speed to a target speed; delaying, until the target speed is reached, powering the machine to produce a second torque, opposite the first torque, and lash crossing the input; operating the machine at the target speed; delaying acceleration of the input from the target speed to the idle speed until a torque request is made.
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Specification