Mitigating transient current effects in engine autostart/stop vehicle
First Claim
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1. A vehicle comprising:
- a controller programmed to, in response to electrical load activation, inhibit engine autostart up to expiration of a predetermined duration so long as a difference between a postactivation battery current, that exceeds a predetermined autostart threshold for a portion of the duration, and a preactivation battery current is less than a predetermined difference, and in response to the postactivation battery current exceeding the predetermined autostart threshold after the duration, request engine autostart.
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Abstract
A vehicle includes an engine and a controller programmed to autostart and autostop the engine. In an autostopped state, engine autostarts are inhibited in the presence of transient currents caused by activation of electrical loads. Engine autostarts are inhibited for a predetermined duration after activation of the electrical load when a battery current is greater than an autostart current threshold.
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Citations
16 Claims
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1. A vehicle comprising:
a controller programmed to, in response to electrical load activation, inhibit engine autostart up to expiration of a predetermined duration so long as a difference between a postactivation battery current, that exceeds a predetermined autostart threshold for a portion of the duration, and a preactivation battery current is less than a predetermined difference, and in response to the postactivation battery current exceeding the predetermined autostart threshold after the duration, request engine autostart. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A vehicle comprising:
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an engine; an electrical load; and a controller programmed to request an engine autostart when a battery current exceeds a predetermined current and, in response to the battery current exceeding the predetermined current within a predetermined duration that begins with detection of a transition of the electrical load to an activated state, inhibit autostart of the engine up to expiration of the predetermined duration so long as a difference between a magnitude of the battery current before and after the detection is less than a predetermined difference. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method comprising:
by a controller, in response to electrical load activation, inhibiting engine autostart up to expiration of a predetermined duration so long as a difference between a postactivation battery current, that exceeds a predetermined threshold for a portion of the duration, and a preactivation battery current is less than a predetermined difference; and in response to the postactivation battery current exceeding the predetermined threshold after expiration of the duration, requesting engine autostart. - View Dependent Claims (14, 15, 16)
Specification