| Patents for G01P 21 - Testing or calibrating of apparatus or devices covered by the other groups of this subclass (4,237) |
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| 04/03/1990 | US4912969 Method of testing a set of wheel speed sensors forming parts of an anti-lock brake control system |
| 03/29/1990 | DE3832541A1 Method for detecting errors in a signal which varies in accordance with the speed of a vehicle |
| 03/08/1990 | DE3829875A1 Circuit arrangement for monitoring an inductive sensor |
| 03/06/1990 | US4906019 Motor vehicle collision sensing device |
| 03/01/1990 | DE3828968A1 Device for testing acceleration sensors |
| 02/20/1990 | US4902970 Apparatus for measuring the speed of an object with circuit for converting analog signals into logic signals and circuit for varying sensitivity |
| 01/25/1990 | WO1990000482A1 Compact crash sensing switch with air channels and diagnostic system |
| 01/24/1990 | EP0351638A1 Method for safeguarding against loss of phase of constant-range phase-displaced phase voltages of a multi-phase tachogenerator, and circuit arrangement for performing said method |
| 01/23/1990 | US4895021 Method of testing a vehicle acceleration sensor for an anti-lock brake control system |
| 12/14/1989 | DE3819994A1 Circuit arrangement for the monitoring of at least one parameter of an operating means |
| 11/30/1989 | WO1989011658A1 Sensor for measuring a motional parameter, in particular crash sensor for a motor vehicle |
| 11/30/1989 | DE3818134A1 Sensor for detecting a motion parameter, e.g. crash sensor for a motor vehicle |
| 10/26/1989 | DE3812570A1 Method for correcting the speed of rotation of vehicle wheels, detected by wheel sensors |
| 10/17/1989 | US4873867 Redundant signal device for auto crash testing |
| 10/03/1989 | US4871993 Self-diagnostic apparatus for vehicle meter |
| 09/28/1989 | DE3809299A1 Electronic device |
| 09/26/1989 | US4869092 Device for calibrating ultra-sensitive accelerometers |
| 09/12/1989 | US4866376 Cross-oil instrument having testing apparatus for vehicular sensor disconnection indication |
| 09/05/1989 | US4864284 Apparatus for sensing a failed position and velocity sensor |
| 09/05/1989 | CA1259118A1 Abnormality determination device for a vehicle speed sensor |
| 07/19/1989 | EP0324620A1 Angular velocity sensor |
| 06/22/1989 | DE3742202A1 Acceleration sensor |
| 06/15/1989 | WO1989005542A1 Apparatus for sensing a failed position and velocity sensor |
| 06/06/1989 | US4837508 Process and device for checking the operational state of a variable reluctance magnetic sensor and their application to automobile electronics |
| 06/01/1989 | WO1989004783A1 Process for correcting the speed of rotation of vehicle wheels determined by wheel sensors |
| 05/24/1989 | DE3738914A1 Method for correcting the vehicle wheel speed determined by wheel sensors |
| 05/11/1989 | DE3736294A1 Einrichtung zur funktionskontrolle von beschleunigungssensoren Means for functional control of acceleration sensors |
| 05/09/1989 | US4829441 Method for determining the air speed of a helicopter, system for carrying on this method and method for calibrating such air speed determining method and system |
| 05/05/1989 | WO1989003999A1 Device for performance testing of acceleration sensors |
| 05/02/1989 | US4827091 Magnetically-damped, testable accelerometer |
| 05/02/1989 | US4825691 Method and apparatus for detecting trouble in pulse generators |
| 04/18/1989 | US4823166 Optical time-domain reflectometry |
| 03/29/1989 | CN1032079A Multifunction digital control checker for measuring standerd rotating speed |
| 03/09/1989 | DE3728431A1 Method for testing the quality of a package |
| 03/07/1989 | US4809541 Electrical test connector and method for testing the Ford vehicle Speed Control System |
| 03/02/1989 | DE3816207A1 Fault detection device for vehicle speed of travel and engine speed sensors |
| 02/28/1989 | US4808920 Method for monitoring a tachometer signal |
| 02/21/1989 | US4805447 Device for detecting an abnormality of a rotation sensor |
| 01/11/1989 | EP0298411A2 Self diagnostic apparatus for vehicle meter |
| 01/04/1989 | CN2030324U Open type calibration wind tunnel for calibrating wind-gauge |
| 12/22/1988 | DE3717677C1 Method for calibrating acceleration pick-ups (sensors), and device for carrying out the method |
| 12/13/1988 | CA1246354A1 Optical measuring device using a spectral modulation sensor having an optically resonant structure |
| 11/10/1988 | DE3728623C1 Sensor for a motor vehicle |
| 10/26/1988 | EP0288333A1 Process and appliance for monitoring a magnetic variable-reluctance sensor, and their use in motor vehicle electronics |
| 10/18/1988 | US4778987 Optical measuring device using a spectral modulation sensor having an optically resonant structure |
| 10/05/1988 | EP0285478A1 Circuit for converting analogous signals into digital signals |
| 09/28/1988 | EP0283626A1 Method for the determination of the air speed of a helicopter, system for applying it, calibration method for this method and system for the determination of the air speed |
| 09/07/1988 | WO1988006541A1 Impact sensor for motor vehicles, with testing circuit |
| 08/30/1988 | US4767164 Transducer system for measuring the rotational speed of a wheel |
| 08/17/1988 | EP0278531A2 Vortex flow meter frequency adjustment |
| 07/26/1988 | US4759212 Abnormality determination device for a vehicle speed sensor |
| 07/20/1988 | EP0274943A1 Calibrating device for ultrasensitive accelerometers |
| 07/20/1988 | EP0274573A1 Device for generating a unique characteristic for sensors |
| 06/07/1988 | US4749157 Spacecraft accelerometer auto-alignment |
| 05/03/1988 | US4742297 Programmable cycle meter |
| 04/20/1988 | CN87105637A Automatic calibration for accelerometer of spacecraft |
| 04/12/1988 | US4736626 Abnormality detection apparatus for vehicle engines |
| 03/22/1988 | US4732034 Tachometer kit with alternator pick up |
| 03/08/1988 | US4729247 Universal doppler flowmeter tester |
| 02/25/1988 | WO1988001389A1 Spacecraft accelerometer auto-alignment |
| 02/25/1988 | WO1988001242A1 Circuit and process for checking electronic sensors |
| 02/18/1988 | DE3627241A1 Schaltung und verfahren zur ueberpruefung elektronischer sensoren Circuit and method for verifying electronic sensors |
| 11/26/1987 | DE3617195A1 Device for monitoring the speed of rotation, especially of fluid flow engines |
| 10/20/1987 | US4701132 Dummy for car crash testing |
| 10/20/1987 | US4700563 Abnormality determination system for revolution speed sensor |
| 08/19/1987 | EP0232890A1 Speed simulator for doppler laser speedometer |
| 08/06/1987 | DE3603442A1 Method and device for determining a fault location in a planing-distance measuring system |
| 07/07/1987 | US4678904 Optical measuring device using a spectral modulation sensor having an optically resonant structure |
| 06/19/1987 | DE3544095A1 Device for calibrating analog real-time signals |
| 06/09/1987 | US4672316 Method for calibrating a muzzle velocity measuring device |
| 06/04/1987 | DE3542397A1 Arrangement for functional testing of piezoelectric acceleration pick-ups |
| 06/04/1987 | DE3541852A1 Monitoring device for a tachometer generator |
| 05/19/1987 | US4667114 Prime mover speed sensing system and method |
| 05/13/1987 | EP0221333A1 Fiber optic rotation rate encoder |
| 03/11/1987 | EP0213872A2 Optical time-domain reflectometry |
| 11/26/1986 | CN85205583U Hot-film probe and its rating device |
| 10/23/1986 | WO1986006172A1 Process for the monitoring of a speed transmitter signal |
| 09/16/1986 | US4611488 Apparatus for clearing the line of a marine speedometer with pressurized gas |
| 09/09/1986 | US4611304 Transducer memory circuit |
| 09/03/1986 | EP0193335A2 Detection of abnormality for rotational speed sensor |
| 07/15/1986 | US4600301 Spinning disk calibration method and apparatus for laser Doppler velocimeter |
| 03/11/1986 | US4575664 Tachometer check apparatus |
| 02/26/1986 | EP0172623A2 Optical measuring device using a spectral modulation sensor having an optically resonant structure |
| 01/21/1986 | US4565963 Test circuit for motor vehicle speed control |
| 05/22/1985 | EP0141924A1 Calibrating method for a muzzle velocity measuring apparatus |
| 05/21/1985 | US4517831 Trouble detecting apparatus for a sensor in an internal combustion engine system |
| 03/05/1985 | US4503509 Calibrator for timing meter |
| 02/26/1985 | US4501288 For controlling a purging fluid for marine speedometer lines |
| 01/22/1985 | US4495433 Dual capability piezoelectric shaker |
| 12/25/1984 | US4489591 Angle of airflow vane positioner |
| 09/25/1984 | US4473768 Piezoelectric force-balance accelerometer system |
| 08/15/1984 | EP0115736A1 Tachograph testing device |
| 06/19/1984 | US4455500 Sensitivity and capacitance adjustment method for piezoelectric accelerometers |
| 05/08/1984 | US4446716 Self-compensating centrifuge arm |
| 05/17/1983 | US4384250 Vital vehicle movement detector |
| 10/05/1982 | US4353068 Method for calibrating beam emitter type speed sensor for railroad rolling stock |
| 09/28/1982 | US4352063 Self-calibrating speedometer/odometer |
| 03/23/1982 | US4320662 Failure detection analyzer |
| 01/19/1982 | US4311035 Test device for acceleration sensors |
| 01/12/1982 | US4310801 Programmable divider |