发明名称 |
WAKE-UP CIRCUIT IN AN ELECTRIC STEERING SYSTEM |
摘要 |
In one aspect, a wake-up circuit is provided for triggering a determination of an absolute rotational position of a rotatable shaft of a motor in an electric power steering system of a vehicle. The wake-up circuit includes a plurality of inputs coupled to separate phases of the motor. A voltage boosting circuit is operable to increase a back electromotive force (EMF) voltage induced on one or more of the inputs by rotation of the rotatable shaft of the motor and produce at least one voltage-boosted back EMF voltage. A comparator circuit is operable to compare the at least one voltage-boosted back EMF voltage to a reference voltage and trigger a monitoring system to perform the determination of the absolute rotational position of the rotatable shaft of the motor in the electric power steering system based on a result of the compare during an ignition off state of the vehicle. |
申请公布号 |
US2014350795(A1) |
申请公布日期 |
2014.11.27 |
申请号 |
US201414455982 |
申请日期 |
2014.08.11 |
申请人 |
STEERING SOLUTIONS IP HOLDING CORPORATION |
发明人 |
Amin Ishtiaque;Bright Philip G.;Fisher Paul M. |
分类号 |
B62D5/04 |
主分类号 |
B62D5/04 |
代理机构 |
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代理人 |
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主权项 |
1. A wake-up circuit for triggering a determination of an absolute rotational position of a rotatable shaft of a motor in an electric power steering system of a vehicle, the wake-up circuit comprising:
a plurality of inputs coupled to separate phases of the motor; a voltage boosting circuit operable to increase a back electromotive force (EMF) voltage induced on one or more of the inputs by rotation of the rotatable shaft of the motor and produce at least one voltage-boosted back EMF voltage; and a comparator circuit operable to compare the at least one voltage-boosted back EMF voltage to a reference voltage and trigger a monitoring system to perform the determination of the absolute rotational position of the rotatable shaft of the motor in the electric power steering system of the vehicle based on a result of the compare during an ignition off state of the vehicle. |
地址 |
Saginaw MI US |