Powertrain Delta Current Estimation Method
First Claim
1. A vehicle comprising:
- an engine;
an electrical bus;
a first set of electrical components configured to demand current from the electrical bus while the engine is on and demand no current while the engine is off;
a second set of electrical components configured to demand current from the electrical bus while the engine is off and demand no current while the engine is on; and
at least one controller programmed to selectively turn the engine off in response to an expected change in current demand on the bus that would (i) result from turning the engine off and (ii) cause total current demand to be less than a predetermined threshold.
2 Assignments
0 Petitions
Accused Products
Abstract
A vehicle includes an engine, electrical loads, and at least one controller. While the engine is on, the controller calculates the change in current demand of the electrical loads expected from turning the engine off. The decision to command the engine off is then based on the expected change in current demand. Electrical loads that will change state from on to off when the engine is turned off will increase the expected change in current demand. Electrical loads that will change state from off to on when the engine is turned off will decrease the expected change in current demand. Operating conditions associated with the electrical loads, such as operating voltage, temperature, and speed, may affect the expected change in current demand.
29 Citations
17 Claims
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1. A vehicle comprising:
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an engine; an electrical bus; a first set of electrical components configured to demand current from the electrical bus while the engine is on and demand no current while the engine is off; a second set of electrical components configured to demand current from the electrical bus while the engine is off and demand no current while the engine is on; and at least one controller programmed to selectively turn the engine off in response to an expected change in current demand on the bus that would (i) result from turning the engine off and (ii) cause total current demand to be less than a predetermined threshold. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A vehicle comprising;
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an engine; a plurality of electrical loads; and at least one controller programmed to, while the engine is on, estimate an expected change in current demanded from the electrical loads that would result from turning the engine off based on an operating condition of the electrical loads and selectively turn the engine off based on the expected change. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method for controlling an engine comprising:
by at least one controller, predicting a change in current demand from engine on to engine off based on a difference between current demanded by components that will reduce current demand when the engine is turned off and current demanded by components that will increase current demand when the engine is turned off; and selectively commanding the engine off based on the predicted change. - View Dependent Claims (14, 15, 16, 17)
Specification