Gas concentration detector having heater for use in internal combustion engine
July 16, 2021. 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 ReferencesInternal combustion engine with oxygen sensor heater control Device for controllably heating oxygen sensor Method and system for internal combustion engine oxygen sensor heating control, synchronizing heater voltage detection with heater energization, and calculating power loss Method and system for internal combustion engine oxygen sensor heating control which provide maximum sensor heating after cold engine starting Method for controlling an oxygen concentration sensor for use in an air/fuel ratio control system of an internal combustion engine Air-fuel ratio controller of internal combustion engine Apparatus for controlling heater for oxygen sensor Method of pulse width modulating an oxygen sensor Heater control apparatus for oxygen sensor Apparatus for controlling a heater for heating an air-fuel ratio sensor InventorApplicationNo. 09/904866 filed on 07/16/2001US Classes:219/494, Thermally responsive123/697Heater for sensor or sensor environmentExaminersPrimary: Jeffery, John A.Attorney, Agent or FirmInternational ClassF02D 41/14 (20060101)Foreign Application Priority Data2000-08-07 JPAbstractA gas concentration detector includes a detector element measuring a constituent gas concentration in exhaust gas emitted from an internal combustion engine and a heater for activating the detector element. During a cranking period of the engine, the heater is pre-heated by electric current supplied thereto in a controlled manner to increase a heater resistance to a certain level. After the engine cranking is completed, a full voltage is supplied to the heater, and thereafter the heater current is supplied in a controlled manner to keep the detector element activated. Since the heater resistance is increased to a certain level by pre-heating, an amount of heater current is limited to a certain level when the full voltage is supplied, and thereby the detector element is prevented from being damaged by an excessive heat stress. | |
