Method and system for vehicle 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, 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, the instructions including an adaptive nonlinear model predictive cruise control routine;
whereinthe controller includes further instructions for;
in response to a convex fuel consumption model, operating the transmission in the forward gear, andin response to a non-convex fuel consumption model, operating the transmission in the neutral state.
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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. The methods and systems include adapting a vehicle dynamics model and a vehicle fuel consumption model that provide input to nonlinear model predictive controller.
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Citations
18 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, 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, the instructions including an adaptive nonlinear model predictive cruise control routine;
whereinthe controller includes further instructions for; in response to a convex fuel consumption model, operating the transmission in the forward gear, and in response to a non-convex fuel consumption model, operating the transmission in the neutral state. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A vehicle system, comprising:
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a vehicle including a motive torque source; a transmission operatively coupled to the motive torque source, the transmission having a neutral state and a forward gear; and a controller in the vehicle, the controller including executable instructions stored in non-transitory memory, the instructions including an adaptive nonlinear model predictive cruise control routine with transmission neutral state activation, wherein the controller includes further instructions to; operate in a constant torque mode in response to a first condition being met, and operate in a pulse-and-glide mode in response to the first condition not being met, where adaptive nonlinear model predictive cruise control routine instructions include instructions to predict an optimal vehicle velocity profile and a corresponding torque profile based on a predicted road grade ahead of a present position of the vehicle;
wherein the first condition being met includes a fuel consumption model being convex, and wherein the first condition not being met includes the fuel consumption model not being convex. - View Dependent Claims (9, 10, 11, 12)
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13. A vehicle cruise control method, comprising:
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receiving vehicle information from one or more sensors of a vehicle to a controller; providing a torque command and a transmission command responsive to output of an adaptive nonlinear model predictive cruise control routine executed by the controller, the adaptive nonlinear model predictive cruise control routine being adapted based on the vehicle information; adjusting a torque actuator of a motive torque source responsive to the torque command; adjusting a gear selection of a transmission responsive to the transmission command; and when a fuel consumption model is non-convex, in response to a vehicle speed increasing to an upper threshold, adjusting the gear selection to a neutral state, adjusting the torque actuator to deliver an idle torque, and coasting the vehicle, and in response to the vehicle speed decreasing to a lower threshold, adjusting the gear selection to a forward gear, adjusting the torque actuator to deliver a torque greater than the idle torque, and accelerating the vehicle. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification