System and method for determining effective road grade characteristic
First Claim
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1. A system comprising a computer in a vehicle, the computer comprising a processor and a memory, wherein the computer is configured to:
- determine an operational state of a vehicle;
calculate a road grade value from data from an accelerometer;
calculate an effective grade value from a torque demand value;
determine a correction coefficient to adjust the road grade value to substantially match the effective grade value when the operation state is determined to be a steady-state condition;
determine a corrected effective grade based at least in part on the correction coefficient and the road grade value; and
adjust a velocity of the vehicle with a cruise control system based at least in part on the corrected effective grade when the operation state is a transient condition;
wherein the correction coefficient is based at least in part on the road grade value and the effective grade value.
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Abstract
A vehicle system includes a computer in a vehicle, and the computer includes a processor and a memory. The computer is configured to determine an operational state of a vehicle, calculate a road grade value from data from a first sensor, calculate an effective road grade value from a torque demand value, update modeling variables to map the road grade value substantially to the effective grade value when the operation state is determined to be a steady-state condition, and calculate a road grade characteristic with the road grade value and the modeling variables.
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Citations
15 Claims
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1. A system comprising a computer in a vehicle, the computer comprising a processor and a memory, wherein the computer is configured to:
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determine an operational state of a vehicle; calculate a road grade value from data from an accelerometer; calculate an effective grade value from a torque demand value; determine a correction coefficient to adjust the road grade value to substantially match the effective grade value when the operation state is determined to be a steady-state condition; determine a corrected effective grade based at least in part on the correction coefficient and the road grade value; and adjust a velocity of the vehicle with a cruise control system based at least in part on the corrected effective grade when the operation state is a transient condition; wherein the correction coefficient is based at least in part on the road grade value and the effective grade value. - View Dependent Claims (2, 3, 4, 5)
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6. A method comprising:
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determining an operational state of a vehicle; calculating a road grade value from data from an accelerometer; calculating an effective grade value from a torque demand value; determining a correction coefficient to adjust the road grade value to substantially match the effective grade value when the operation state is determined to be a steady-state condition, determining a corrected effective grade based at least in part on the correction coefficient and the road grade value; and adjusting a velocity of the vehicle with a cruise control system based at least in part on the corrected effective grade when the operation state is a transient condition; wherein the correction coefficient is based at least in part on the road grade value and the effective grade value. - View Dependent Claims (7, 8, 9, 10)
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11. A non-transitory computer-readable medium tangibly embodying computer-executable instructions that cause a processor to execute operations comprising:
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determining an operational state of a vehicle; calculating a road grade value from data from an accelerometer; calculating an effective grade value from a torque demand value; determining a correction coefficient to adjust the road grade value to substantially match the effective grade value when the operation state is determined to be a steady-state condition, determining a corrected effective grade based at least in part on the correction coefficient and the road grade value; and adjusting a velocity of the vehicle with a cruise control system based at least in part on the corrected effective grade when the operation state is a transient condition; wherein the correction coefficient is based at least in part on the road grade value and the effective grade value. - View Dependent Claims (12, 13, 14, 15)
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Specification