What is claimed is:
1. A card security device for cards which have coded information stored on information storage media on or within the cards comprising a releasably and lockably closable card vault, wherein said vault does not have an external key pad, said vault having a door for releasable locking enclosure of at least one of said cards within said card vault wherein, within said vault, a locking actuator for locking and unlocking said door on said vault cooperates with a recognition processor, said recognition processor cooperating with a biometric sensor, said card vault having a casing which, when closed, has no substantially structurally weakened areas which may provide for a breach access during assault on said casing,
2. The device of claim 1 wherein said card vault is releasably and lockably closable by a latch, wherein said processor which is releasable by means cooperates with said actuator for opening said latch thereby unlocking said door on said card vault so as to allow said door to be opened upon recognition and a match of a biometric sample sensed by said sensor with a biometric template stored by said processor in a memory device.
3. The device of claim 2 wherein said biometric being sensed is behaviour pattern recognition and said sensor is a motion sensor, wherein said processor monitors repeated incorrect behaviour patterns by a user, or assault of said card vault, upon which said processor triggers, by triggering means mounted within said vault, of a destruction means for rendering useless and unrecoverable said coded information on said information storage media.
4. The device of claim 1 wherein said destruction means is a fluid release means to release fluid adapted to disfigure or destroy said information storage media when said at least one card is held within said card vault and said processor triggers said triggering means.
5. The device of claim 1 wherein said sensor is a fingerprint scanner mounted on said vault and said biometric being sensed and sampled is a user’s fingerprint.
6. A card security device comprising:
a case having a cavity for snugly receiving a card therein, said case having a door for sealing closed said cavity, said case having no substantially structurally weakened areas which may provide for a breach access during assault on said case,
information destroying means for destroying information storage media on said card,
user-input recognition means for receipt and recognition testing of a biometric input from a user and communication of an arming signal to said destroying means upon failure of said recognition testing so as to cause destruction of said information storage media.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
What is claimed is:
1. A wheel speed calculation method wherein, to calculate wheel speed at the calculation timing of a given period based on a pulse signal provided by shaping the waveform of a detection signal of a wheel speed sensor (1,8), the wheel speed sensor including a rotor (2,9) with a plurality of detected elements rotating with wheel which is a controlled object;
when both rising and falling edges occur in the present calculation period, wheel speed VW is calculated as follows:
VWKNu(n)Nd(n)Tu(n)Td(n)
when a rising edge does not occur although a falling edge occurs in the present calculation period, the value of VW1 or VW2, whichever is the lower, is selected as the wheel speed VW, VW1 and VW2 being calculated as follows:
VW1KNu(n1)Nd(n)Tu(n1)Td(n)VW2K1Nd(n)TutTd(n)
when a falling edge does not occur although a rising edge occurs in the present calculation period, the value of VW3 or VW4, whichever is the lower, is selected as the wheel speed VW, VW3 and VW4 being calculated as follows:
VW3KNu(n)Nd(n1)Tu(n)Td(n1)VW4KNu(n)1Tu(n)Tdt
when neither a rising edge nor a falling edge occurs in the present calculation period, a comparison is made between the minimum value of VW5 to VW7 and the preceding wheel speed VW and the minimum value or the preceding wheel speed VW, whichever is the lower, is selected as the present wheel speed VW, VW5 to VW7 being calculated as follows;
VW5K1Nd(n1)TutTd(n1)VW6KNu(n1)1Tu(n1)TdtVW7(K2)(TutTdt)
wherein Tu(n) is the rising side speed calculation reference time between the instant at which the last rising edge of the pulse signal in the preceding calculation period occurs and the instant at which the last rising edge in the present calculation period occurs,
Td(n) is the falling side speed calculation reference time between the instant at which the last falling edge of the pulse signal in the preceding calculation period occurs and the instant at which the last falling edge in the present calculation period occurs,
Nu(n) is the number of occurrences of the rising edge within the rising side speed calculation reference time Tu (n),
Nd(n) is the number of occurrences of the falling edge within the falling side speed calculation reference time Td(n),
Tut is the rising side speed calculation temporary reference time between the instant at which the last rising edge occurs and the present calculation timing when no rising edge occurs in the present calculation period,
Tdt is the falling side speed calculation temporary reference time between the instant at which the last falling edge occurs and the present calculation timing when no falling edge occurs in the present calculation period,
K is a constant determined in response to a tire to which calculation of the wheel speed is applied and the number of detected elements (2a, 9a) of a rotor (2, 9) of the wheel speed sensor (1, 8), and
Tu(n1), Td(n1), Nu(n1), and Nd(n1) are the value of the rising side speed calculation reference time Tu(n), the value of the falling side speed calculation reference time Td(n), the value of the number of occurrences Nu(n), and the value of the number of occurrences Nd(n) in the preceding calculation period respectively.
2. A wheel speed calculation method as set forth in claim 1 calculates the wheel speed used for brake control.
3. A wheel speed calculation method asset forth in claim 2, the wheel speed VW is calculated in a control unit for the brake.