Electrical circuit module with magnetic detection of loose or detached state
First Claim
1. An electric circuit module adapted for attachment in a mounted position to a vehicle part comprising a magnetic material, the module comprising:
- a case made of a non-magnetic material and having an attachment portion;
a permanent magnet fixed within the case;
a Hall effect sensor fixed within the case in positional relation to the permanent magnet and the attachment portion such that the Hall effect sensor generates a first signal when the attachment portion of the case is fixedly attached to a member comprising a magnetic material and a second signal different from the first signal when the attachment portion of the case is not so fixedly attached; and
an electric circuit in the case comprising circuit elements responsive to the Hall effect sensor to provide a first mode of operation in response to the first signal and a second mode of operation in response to the second signal, the case being free of any additional magnetic element mounted in a manner permitting movement relative to the Hall effect sensor so as to cause, as a result of such movement, the Hall effect sensor to generate a signal other than the first signal while the attachment portion of the case is fixedly attached to the member comprising a magnetic material.
1 Assignment
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Accused Products
Abstract
An electric circuit module has a case made of a non-magnetic material. The case has an attachment portion for fixed mounting on a vehicle part made of a magnetic material and a permanent magnet fixed within the case. The module further has a Hall effect sensor fixed within the case in positional relation to the permanent magnet and the attachment portion such that the Hall effect sensor generates a first signal when the attachment portion of the case is fixedly attached to the vehicle part and a second signal different from the first signal when the attachment portion of the case is not so mounted. The module also has an electric circuit in the case with circuit elements responsive to the Hall effect sensor to provide a first mode of operation in response to the first signal and a second mode of operation in response to the second signal. The module is particularly useful when at least one of the electric circuit elements is an accelerometer, for example in a vehicle passive restraint deployment system. In such an application, the Hall effect sensor output indicates the validity of the accelerometer output signal as an indication of accelerations of the vehicle part and can thus help control the use of the accelerometer signal in determining restraint deployment.
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Citations
15 Claims
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1. An electric circuit module adapted for attachment in a mounted position to a vehicle part comprising a magnetic material, the module comprising:
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a case made of a non-magnetic material and having an attachment portion;
a permanent magnet fixed within the case;
a Hall effect sensor fixed within the case in positional relation to the permanent magnet and the attachment portion such that the Hall effect sensor generates a first signal when the attachment portion of the case is fixedly attached to a member comprising a magnetic material and a second signal different from the first signal when the attachment portion of the case is not so fixedly attached; and
an electric circuit in the case comprising circuit elements responsive to the Hall effect sensor to provide a first mode of operation in response to the first signal and a second mode of operation in response to the second signal, the case being free of any additional magnetic element mounted in a manner permitting movement relative to the Hall effect sensor so as to cause, as a result of such movement, the Hall effect sensor to generate a signal other than the first signal while the attachment portion of the case is fixedly attached to the member comprising a magnetic material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 15)
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9. A vehicle restraint deployment system comprising an electric circuit module fixedly attached in a mounted position to a vehicle part comprising a magnetic material, the module comprising:
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a case made of a non-magnetic material and having an attachment portion;
a permanent magnet fixed within the case;
a Hall effect sensor fixed within the case in positional relation to the permanent magnet and the attachment portion such that the Hall effect sensor generates a first signal with the attachment portion of the case in the fixedly attached position but generates a second signal different from the first signal if the attachment portion of the case becomes not so fixedly attached; and
an electric circuit in the case comprising circuit elements responsive to the Hall effect sensor to provide a first mode of operation in response to the first signal and a second mode of operation in response to the second signals the case being free of any additional magnetic element mounted in a manner permitting movement relative to the Hall effect sensor so as to cause, as a result of such movement, the Hall effect sensor to generate a signal other than the first signal while the attachment portion of the case is fixedly attached to the member comprising a magnetic material. - View Dependent Claims (10, 11, 12, 13)
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14. An apparatus comprising, in combination:
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a vehicle member comprising a magnetically responsive material; and
an electric circuit module adapted for attachment in a mounted position to the vehicle member, the module comprising, in combination;
a case made of a non-magnetic material and having an attachment portion attached to the vehicle member near the magnetically responsive material and;
a permanent magnet fixed within the case;
a Hall effect sensor fixed within the case in positional relation to the permanent magnet and the attachment portion such that the Hall effect sensor generates a first signal during a particular motion of the vehicle part if the attachment portion of the case is fixedly attached to the vehicle member and a second signal different from the first signal during the particular motion of the vehicle member when the attachment portion of the case is not so fixedly attached; and
an electric circuit in the case comprising circuit elements responsive to the Hall effect sensor to provide a first mode of operation in response to the first signal and a second mode of operation in response to the second signal, the case being free of any additional magnetic element mounted in a manner permitting movement relative to the Hall effect sensor so as to cause, as a result of such movement, the Hall effect sensor to generate a signal other than the first signal while the attachment portion of the case is fixedly attached to the member comprising a magnetic material.
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Specification