Malfunction detector for speed sensors
Patent 4233599 Issued on November 11, 1980. Estimated Expiration Date: 
February 28, 1999. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
February 28, 1999. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3701139 3841712 3920280 Fault detection for wheel slip control system Locked axle detector for a multi-axled traction vehicle Testing rotary movement-electrical signal transducer system, particularly for vehicle wheel anti-block transducer systems Anti-skid electronic control system having an error detecting circuit Electronic antiskid control device Acceleration warning device Patent #: 4171030 InventorAssigneeApplicationNo. 06/016351 filed on 02/28/1979US Classes:340/679, Machine condition188/181C, Comparative303/122.06, ABS failure detected via time period of sensed wheel lock or wheel speed signal303/176, Antilock control disabled or altered for acceleration or speed ranges340/438, Internal alarm or indicator responsive to a condition of the vehicle340/672Direction of shaft rotationExaminersPrimary: Swann, III, Glen R.Attorney, Agent or FirmInternational ClassesG01P 3/42 (20060101)G01P 3/48 (20060101) Foreign Application Priority Data1978-02-28 GBAbstractA system is disclosed for monitoring operation of a speed sensor which produces a pulse signal with a repetition frequency related to the speed being sensed.An analogue speed signal is derived from a pulse signal having a repetition frequency related to the sensed speed and is fed to an integrator which, under the control of the pulse signal, performs successive separate integrating operations on the analogue speed signal in the periods between successive pulses, and a comparator compares the integrated sum thus produced with a reference value corresponding to a limit for normal generation of pulses, to produce a warning signal if the integrated sum exceeds the reference value. The system may include a timer to respond to successive warning signals and produce a malfunction signal if they occur with less than a predetermined time interval between them. The system may also include a differentiator to differentiate the sensor pulse signal so as to obtain a spiked reset pulse at each edge of each sensor pulse, these reset pulses then being used to control the integrator. The integrating operations may be performed during the mark and the space portions of each pulse cycle. | |
