Adjusting motor torque to compensate for uphill and downhill demands during cruise control in hybrid vehicle
First Claim
1. A method for a vehicle having an engine, a traction motor, and a transmission coupled in-series, comprising:
- controlling engine torque to attempt to maintain a cruise control speed of the vehicle as the vehicle travels uphill; and
controlling motor torque to maintain the cruise control speed without downshifting the transmission, the motor torque including an initial torque associated with no transmission downshift and an additional torque associated with a commanded transmission downshift.
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Accused Products
Abstract
A system and method for controlling a hybrid vehicle having an engine, a battery powered traction motor, and an automatic step-ratio transmission selectively coupled in series by a clutch include engaging the clutch to couple the engine and the motor and controlling motor torque to provide braking torque through the transmission to substantially maintain a cruise control speed. In one embodiment, a hybrid electric vehicle includes a battery powered traction motor connected to a transmission, an engine selectively coupled in series with the motor by a clutch, and a controller communicating with the traction motor and the engine and configured to control the motor to provide braking torque when the clutch is engaged and engine braking torque is insufficient to maintain cruise control speed of the vehicle as the vehicle travels downhill.
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Citations
17 Claims
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1. A method for a vehicle having an engine, a traction motor, and a transmission coupled in-series, comprising:
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controlling engine torque to attempt to maintain a cruise control speed of the vehicle as the vehicle travels uphill; and controlling motor torque to maintain the cruise control speed without downshifting the transmission, the motor torque including an initial torque associated with no transmission downshift and an additional torque associated with a commanded transmission downshift. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system for controlling a hybrid vehicle having an engine selectively coupled in series with a traction motor and automatic step-ratio transmission by a clutch, comprising:
a controller configured to control engine torque to attempt to maintain a cruise control speed of the vehicle as the vehicle travels uphill and to increase positive motor torque to the transmission to maintain the cruise control speed of the vehicle without downshifting the transmission as the vehicle travels uphill, the motor torque including an initial torque associated with no transmission downshift and an additional torque associated with a commanded transmission downshift. - View Dependent Claims (8, 9, 10, 11)
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12. A hybrid electric vehicle comprising:
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a battery power traction motor connected to a transmission; an engine selectively coupled in series with the motor by a clutch; and a controller communicating with the traction motor and the engine and configured to control the motor to provide positive motor torque to the transmission when the clutch is engaged and engine torque is insufficient to maintain cruise control speed of the vehicle without downshifting the transmission as the vehicle travels uphill, the motor torque including an initial torque associated with no transmission downshift and an additional torque associated with a commanded transmission downshift. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification