US Patent No: 5,243,296

Number of patents in Portfolio can not be more than 2000

Method and apparatus for checking operation of solenoid

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ATTORNEY / AGENT: (SPONSORED)
 

Importance

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Abstract

When a solenoid has been turned on by supplying current to a coil thereof, the solenoid operation is checked by temporarily ceasing the supply of current to the coil to temporarily deenergize the solenoid. The current flowing in the coil is detected while the solenoid is temporarily deenergized, and the characteristics of the thus detected current are used to discriminate the position of a movable iron core of the solenoid. On the other hand, when the solenoid has been turned off by ceasing the supply of current to the coil, the solenoid operation is checked by temporarily supplying current to the coil to thereby temporarily energize the solenoid. The current flowing in the coil while the solenoid is temporarily energized is detected, and the characteristics of the thus detected coil current are used to determine the position of the movable iron core of the solenoid.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
TOKIMEC INC.TOKYO70

International Classification(s)

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  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Ando, Tsuyoshi Sano, JP 6 36
Hatakenaka, Kousuke Sano, JP 2 16
Kakinuma, Toshibumi Sano, JP 1 8
Kihara, Kazuyuki Sano, JP 3 21
Kominami, Tomokazu Tatebayashi, JP 1 8
Mito, Akio Yokohama, JP 7 54

Cited Art

Patent Info (Count) # Cites Year
 
IMPERIAL CHEMICAL INDUSTRIES PLC (1)
4,504,789 Equipment for testing electrical devices such as solenoids 4 1982
 
NORTEL NETWORKS LIMITED (1)
4,319,193 Testing of relays and similar devices 15 1980

Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
CONTINENTAL AUTOMOTIVE GMBH (2)
7,906,974 Method for checking an inductive load 0 2006
7,441,550 Method and device for activating a valve of a fuel vapor retention system 3 2007
 
EATON CORPORATION (2)
5,774,323 Detection of contact position from coil current in electromagnetic switches having AC or DC operated coils 9 1995
6,307,376 Fault detection system and method for solenoid controlled actuators of a transmission system 6 1998
 
CHRYSLER GROUP LLC (1)
5,796,261 Method and device for detecting solenoid actuation 3 1996
 
ENERTECH (1)
5,548,210 System and procedure for the check-up solenoid valves 9 1994
 
FORD GLOBAL TECHNOLOGIES, INC. (1)
5,808,471 Method and system for verifying solenoid operation 12 1996
 
HITACHI, LTD. (1)
6,147,498 Device for detecting fault in solenoid valve 4 1998