HYBRID VEHICLE CONTROL FOR TRAVELING OVER A GRADE
First Claim
1. A method for controlling a hybrid vehicle having an engine, comprising:
- automatically stopping the engine in response to vehicle power demand dropping below currently available electrical power; and
in response to receiving a signal indicating a grade, automatically starting the engine when vehicle power demand is at a first offset below currently available electrical power to reduce a time delay for starting the engine and increase a currently available vehicle power to move the vehicle up the grade, wherein the first offset is greater than a second offset for a vehicle on level ground.
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Abstract
A method for controlling a hybrid vehicle having an engine includes automatically stopping the engine in response to vehicle power demand dropping below currently available electrical power, and automatically starting the engine when vehicle power demand is at a first offset below currently available electrical power to reduce a time delay for starting the engine and increase a currently available vehicle power to move the vehicle up a grade in response to receiving a signal indicating a positive grade. A hybrid vehicle includes an engine, an electric machine, and a controller. The controller is configured to control starting/stopping of the engine in response to a first driver demand when receiving a signal indicative of a road grade angle exceeding a corresponding threshold and in response to a second driver demand otherwise.
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Citations
18 Claims
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1. A method for controlling a hybrid vehicle having an engine, comprising:
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automatically stopping the engine in response to vehicle power demand dropping below currently available electrical power; and in response to receiving a signal indicating a grade, automatically starting the engine when vehicle power demand is at a first offset below currently available electrical power to reduce a time delay for starting the engine and increase a currently available vehicle power to move the vehicle up the grade, wherein the first offset is greater than a second offset for a vehicle on level ground. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A hybrid vehicle comprising:
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an engine; an electric machine; and a controller configured to control starting/stopping of the engine in response to a first driver demand when receiving a signal indicative of a road grade angle exceeding a corresponding threshold and in response to a second driver demand otherwise. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A method for controlling a hybrid vehicle on a grade comprising:
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receiving a slope signal; in response to a torque to accelerate the vehicle being within a first predetermined offset below an engine torque pull up schedule for a vehicle on level terrain, commanding the engine to start to reduce a time delay for starting the engine and increase vehicle torque to move the vehicle when the slope is positive; and in response to the torque to accelerate the vehicle being within a second predetermined offset above an engine torque shut down schedule based on a maximum available electric machine torque for a vehicle on level terrain, commanding the engine to shut down to increase fuel efficiency when the slope is negative. - View Dependent Claims (15, 16, 17, 18)
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Specification