METHODS AND SYSTEM FOR DECELERATING A VEHICLE
First Claim
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1. A method for operating a vehicle, comprising:
- decelerating a vehicle via freewheeling a driveline in response to a demand torque less than a threshold, vehicle speed greater than a threshold, and traffic conditions that do not indicate expected driver braking within a predetermined vehicle travel distance.
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Abstract
A method for improving operation of a vehicle that includes an engine, a transmission, and a torque converter clutch is disclosed. In one example, the method assesses whether or not driver braking is expected and adjusts driveline braking accordingly. The method freewheels the driveline to extend vehicle coasting when driver braking is not expected and the method increases or decreases driveline braking based on a closing distance between the vehicle and an object in the vehicle'"'"'s path.
21 Citations
20 Claims
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1. A method for operating a vehicle, comprising:
decelerating a vehicle via freewheeling a driveline in response to a demand torque less than a threshold, vehicle speed greater than a threshold, and traffic conditions that do not indicate expected driver braking within a predetermined vehicle travel distance. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for operating a vehicle, comprising:
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decelerating a vehicle via freewheeling a driveline in response to a demand torque less than a threshold, vehicle speed greater than a threshold, a vehicle brake pedal not applied, and traffic conditions that do not indicate expected driver braking within a predetermined vehicle travel distance; and decelerating the vehicle via ceasing to supply fuel to an engine of the vehicle while the engine rotates and a torque converter clutch is locked in response to the demand torque less than the threshold, vehicle speed greater than the threshold, the vehicle brake pedal not applied, and traffic conditions that indicate expected driver braking within the predetermined travel distance. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A system for a vehicle, comprising:
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a driveline including an engine; an accelerator pedal. a brake pedal; a transmission coupled to the engine, the transmission including a torque converter clutch; and at least one controller including executable instructions stored in non-transitory memory to close the torque converter clutch and freewheel the driveline via shifting a transmission into neutral in response to expected driver applied braking based on traffic conditions, demand torque less than a threshold, and vehicle speed greater than a threshold. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification