Hybrid electric vehicle braking downshift control
First Claim
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1. A hybrid propulsion system for a vehicle, comprising:
- a multiple step fixed-gear ratio transmission device for transmitting torque to a first at least one drive wheel;
a first electric energy conversion device coupled to an input of the multiple step fixed-gear ratio transmission device; and
a control system, wherein during a deceleration condition, the control system increases negative torque output of the first electric energy conversion device to meet a desired wheel braking torque in response to the fixed-gear ratio transmission transitioning from a first gear ratio to a second gear ratio that is higher than the first gear ratio.
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Abstract
A hybrid propulsion system for a vehicle is disclosed. In one embodiment an energy conversion device compensates for transmission shifting. The system can improve transmission shifting during at least some conditions.
76 Citations
21 Claims
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1. A hybrid propulsion system for a vehicle, comprising:
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a multiple step fixed-gear ratio transmission device for transmitting torque to a first at least one drive wheel; a first electric energy conversion device coupled to an input of the multiple step fixed-gear ratio transmission device; and a control system, wherein during a deceleration condition, the control system increases negative torque output of the first electric energy conversion device to meet a desired wheel braking torque in response to the fixed-gear ratio transmission transitioning from a first gear ratio to a second gear ratio that is higher than the first gear ratio. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of controlling a hybrid propulsion system for a vehicle including at least an internal combustion engine and a first electric energy conversion device for exchanging torque with a multiple step fixed-gear ratio transmission device, the fixed-gear ratio transmission device exchanging torque with a first set of drive wheels, the hybrid propulsion system having a second electric energy conversion device for exchanging torque with a second set of drive wheels, the method comprising:
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during an engine braking deceleration condition, receiving a requested wheel brake torque; adjusting a gear ratio state of the fixed-gear ratio transmission device to increase a level of braking force provided to the first set of drive wheels of the vehicle in response to receiving the requested wheel brake torque; varying a level of torque exchanged between the first electric energy conversion device and the first set of drive wheels responsive to adjusting the gear ratio state of the fixed-gear ratio transmission device and based on a traction control event of the second set of drive wheels; and varying a level of torque exchanged between the second electric energy conversion device and the second set of drive wheels responsive to adjusting the gear ratio state of the fixed-gear transmission device and based on a traction control event of the first set of drive wheels. - View Dependent Claims (11, 12, 13, 14)
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15. A hybrid propulsion system for a vehicle, comprising:
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a multiple step fixed-gear ratio transmission device for transmitting torque to a first at least one drive wheel; a first electric energy conversion device coupled to an input of the fixed-gear ratio transmission device; a second electric energy conversion device for transmitting torque to a second at least one drive wheel; a control system configured to provide torque output to meet a desired wheel braking torque in response to the multiple step fixed-gear ratio transmission transitioning from a first gear ratio to a second gear ratio that is higher than the first gear ratio, the control system configured to perform a first mode to provide torque output to meet the desired wheel braking torque, wherein braking torque is provided by the first electric energy conversion device and the second electric energy conversion device does not provide braking torque, the control system configured to perform a second mode to provide torque output to meet the desired wheel braking torque, wherein braking torque is provided by the second electric energy conversion device and the first electric energy conversion device does not provide braking torque, and the control system configured to perform a third mode to provide torque output to meet the desired wheel braking torque, wherein braking torque is provided by the first electric energy conversion device and the second electric energy conversion device. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification