Method and system for controlling shifting of a vehicle in cruise control
First Claim
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1. A vehicle system, comprising:
- a vehicle including a motive torque source;
a transmission coupled to the motive torque source; and
a controller in the vehicle, the controller including executable instructions stored in non-transitory memory, wherein the controller is configured to;
sense a vehicle speed;
provide a torque command to the motive torque source responsive to an output of an adaptive nonlinear model predictive cruise control routine, the torque command determined based on a shape of a vehicle fuel consumption model; and
operate the motive torque source to output a powertrain torque, the powertrain torque constrained below a powertrain torque threshold, where the transmission downshifts responsive to the powertrain torque equal to or greater than the powertrain torque threshold at the sensed vehicle speed.
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Abstract
Methods and systems are presented for improving performance of a vehicle operating in a cruise control mode where a controller adjusts torque output from a vehicle to maintain vehicle speed within a desired range while preventing the unnecessary downshifts. The methods and systems include adapting a vehicle dynamics model and a vehicle fuel consumption model that provide input to nonlinear model predictive controller.
57 Citations
14 Claims
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1. A vehicle system, comprising:
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a vehicle including a motive torque source; a transmission coupled to the motive torque source; and a controller in the vehicle, the controller including executable instructions stored in non-transitory memory, wherein the controller is configured to; sense a vehicle speed; provide a torque command to the motive torque source responsive to an output of an adaptive nonlinear model predictive cruise control routine, the torque command determined based on a shape of a vehicle fuel consumption model; and operate the motive torque source to output a powertrain torque, the powertrain torque constrained below a powertrain torque threshold, where the transmission downshifts responsive to the powertrain torque equal to or greater than the powertrain torque threshold at the sensed vehicle speed. - View Dependent Claims (2, 3, 4, 5)
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6. A vehicle system, comprising:
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a vehicle including a motive torque source; a transmission coupled to the motive torque source, the transmission including a neutral state and a forward gear; and a controller in the vehicle, the controller including executable instructions stored in non-transitory memory, wherein the controller is configured to; sense a vehicle speed; provide a torque command to the motive torque source responsive to an output of an adaptive nonlinear model predictive cruise control routine; operate the motive torque source to output a powertrain torque, the powertrain torque constrained below a powertrain torque threshold, where the transmission downshifts responsive to the powertrain torque equal to or greater than the powertrain torque threshold at the sensed vehicle speed; in response to a convex fuel consumption model, operate the transmission in the forward gear; and in response to a non-convex fuel consumption model, operate the transmission in the neutral state. - View Dependent Claims (7, 8, 9, 10)
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11. A vehicle cruise control method, comprising:
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receiving vehicle information from one or more sensors to a controller; sensing the vehicle speed; providing a torque command responsive to output of an adaptive nonlinear model predictive cruise control routine executed by the controller, the torque command determined based on a shape of a vehicle fuel consumption model, the torque command constrained to a value less than a powertrain torque threshold, where a transmission downshifts responsive to the torque command equal to or greater than the powertrain torque threshold at the sensed vehicle speed; and adjusting a torque actuator of a motive torque source responsive to the torque command. - View Dependent Claims (12, 13, 14)
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Specification