Selective powertrain heating system
First Claim
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1. A vehicle comprising:
- a powertrain having a plurality of components, including an engine; and
a controller programmed to;
calculate a quotient value for each component derived from a calculated temperature-dependent friction loss for the component and a thermal mass of the component received from a lookup tableidentify one of the plurality of components as having the greatest quotient value, andheat the one of the plurality of components with waste heat from the engine.
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Abstract
A vehicle includes a powertrain having an engine and at least one controller. The controller is programmed to selectively heat at least one of a plurality of components of the powertrain with a given amount of waste heat based on an expected decrease in friction power associated with an expected increase in temperature from the given amount of waste heat for each of the components.
32 Citations
12 Claims
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1. A vehicle comprising:
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a powertrain having a plurality of components, including an engine; and a controller programmed to; calculate a quotient value for each component derived from a calculated temperature-dependent friction loss for the component and a thermal mass of the component received from a lookup table identify one of the plurality of components as having the greatest quotient value, and heat the one of the plurality of components with waste heat from the engine. - View Dependent Claims (2, 3, 4)
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5. A method for controlling a selective heating system comprising:
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calculating a value of friction-power loss per energy input for each of a plurality of components in a powertrain, wherein the value is derived from a calculated temperature-dependent friction loss for the component and a thermal mass of the component received from a lookup table; identifying one of the plurality of components of the powertrain as having a greatest value of friction-power loss per energy input; and heating the one of the plurality of components. - View Dependent Claims (6, 7)
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8. A vehicle control system comprising:
at least one controller programmed to; calculate a quotient value for each of a plurality of components of a powertrain derived from a calculated temperature-dependent friction loss for the component and a thermal mass for the component received from a lookup table, identify one of the plurality of components as having the greatest quotient value, and heat the one of the plurality of components with waste heat from an engine. - View Dependent Claims (9, 10, 11, 12)
Specification