Method for controlling regenerative braking in a vehicle
First Claim
1. Method for controlling braking in a vehicle including a friction braking system and a powertrain system including a torque machine operative to react tractive torque input from a wheel of the vehicle, a microprocessor performs the following steps:
- monitoring operation of the powertrain system;
determining a driver intended total brake torque;
determining a regenerative braking capacity based upon the operation of the powertrain system;
determining a regenerative braking request based upon a time-rate change in the regenerative braking capacity comprising determining the regenerative braking request based upon the regenerative braking capacity modified using a first slope regulating function when the time-rate change in the regenerative braking capacity exceeds a threshold and determining the regenerative braking request based upon the regenerative braking capacity modified using a second slope regulating function when the time-rate change in the regenerative braking capacity is within the threshold; and
determining a motor torque command for the torque machine based upon the regenerative braking request;
wherein determining the regenerative braking request based upon the regenerative braking capacity modified using the first slope regulating function when the time-rate change in the regenerative braking capacity exceeds the threshold comprises applying a three-term Weibull function in a forward-fitting large curve fit operation to maximize the regenerative braking request based upon the regenerative braking capacity; and
wherein determining the regenerative braking request based upon the regenerative braking capacity modified using the second slope regulating function when the time-rate change in the regenerative braking capacity is within the threshold comprises applying a three-term Weibull function in a forward fitting small curve fit operation to maximize the regenerative braking request based upon the regenerative braking capacity.
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Accused Products
Abstract
A vehicle includes a friction braking system and a powertrain system including a torque machine operative to react tractive torque input from a wheel of the vehicle. A method for controlling braking in a vehicle includes monitoring operation of the powertrain system, determining a driver intended total brake torque, determining a regenerative braking capacity based upon the operation of the powertrain system, determining a regenerative braking request based upon a time-rate change in the regenerative braking capacity, and determining a motor torque command for the torque machine based upon the regenerative braking request.
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Citations
8 Claims
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1. Method for controlling braking in a vehicle including a friction braking system and a powertrain system including a torque machine operative to react tractive torque input from a wheel of the vehicle, a microprocessor performs the following steps:
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monitoring operation of the powertrain system; determining a driver intended total brake torque; determining a regenerative braking capacity based upon the operation of the powertrain system; determining a regenerative braking request based upon a time-rate change in the regenerative braking capacity comprising determining the regenerative braking request based upon the regenerative braking capacity modified using a first slope regulating function when the time-rate change in the regenerative braking capacity exceeds a threshold and determining the regenerative braking request based upon the regenerative braking capacity modified using a second slope regulating function when the time-rate change in the regenerative braking capacity is within the threshold; and determining a motor torque command for the torque machine based upon the regenerative braking request;
wherein determining the regenerative braking request based upon the regenerative braking capacity modified using the first slope regulating function when the time-rate change in the regenerative braking capacity exceeds the threshold comprises applying a three-term Weibull function in a forward-fitting large curve fit operation to maximize the regenerative braking request based upon the regenerative braking capacity; andwherein determining the regenerative braking request based upon the regenerative braking capacity modified using the second slope regulating function when the time-rate change in the regenerative braking capacity is within the threshold comprises applying a three-term Weibull function in a forward fitting small curve fit operation to maximize the regenerative braking request based upon the regenerative braking capacity. - View Dependent Claims (2, 3, 4, 5)
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6. Method for controlling braking in a vehicle including a friction braking system and a powertrain system including a plurality of torque machines operative to react tractive torque input from a driveline, a microprocessor performs the following steps:
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monitoring operation of the powertrain system; determining a driver intended total brake torque; determining a regenerative braking capacity based upon the operation of the powertrain system; determining a regenerative braking request based upon the regenerative braking capacity modified using a slope regulating function comprising determining the regenerative braking request based upon the regenerative braking capacity modified using a first slope regulating function when the time-rate change in the regenerative braking capacity exceeds a threshold and determining the regenerative braking request based upon the regenerative braking capacity modified using a second slope regulating function when the time-rate change in the regenerative braking capacity is less than the threshold; determining motor torque commands for the first and second torque machines based upon the regenerative braking request, and determining a braking torque command to the friction brakes based upon the driver intended total brake torque and the regenerative braking request. - View Dependent Claims (7)
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8. Method for controlling braking in a vehicle including a friction braking system and a powertrain system including a torque machine operative to react tractive torque input from a driveline, a microprocessor performs the following steps:
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determining a regenerative braking capacity based upon the operation of the powertrain system; determining a regenerative braking request based upon the regenerative braking capacity modified using a slope regulating function, wherein the slope regulating function comprises a first slope regulating function when the time-rate change in the regenerative braking capacity exceeds a threshold and the slope regulating function comprises a second slope regulating function when the time-rate change in the regenerative braking capacity is less than the threshold; determining a motor torque command for the torque machine based upon the regenerative braking request, and determining a braking torque command to the friction brakes based upon the driver intended total brake torque and the regenerative braking request;
wherein determining the regenerative braking request based upon the regenerative braking capacity modified using the first slope regulating function comprises applying a three-term Weibull function in a forward-fitting large curve fit operation to maximize the regenerative braking request based upon the regenerative braking capacity; andwherein determining the regenerative braking request based upon the regenerative braking capacity modified using the second slope regulating function comprises applying a three-term Weibull function in a forward-fitting small curve fit operation to maximize the regenerative braking request based upon the regenerative braking capacity.
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Specification