Title:
DEVICE FOR CONTROLLING HEATER OF AIR-FUEL RATIO SENSOR
Document Type and Number:
Japanese Patent JP3524373
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a device for controlling the heater of an air-fuel ratio sensor capable of early activation while preventing a sensor element from being damaged.
SOLUTION: The energization of a heater is controlled from the beginning of the starting of an engine. Initially the energization is performed at an initial duty value set on the basis of an engine water temperature Tw at the time of starting, and the energization of the heater is controlled so as to increase the amount of energization gradually with the passage of time so that the initial duty value may become a maximum duty value within a control time (required time) from the beginning of the starting (S1-S3). By this, it is possible to maximize the early activation of a sensor element while relaxing thermal shock to the sensor element.
Inventors:
Osaki, Masanobu
Application Number:
JP6689498A
Publication Date:
May 10, 2004
Filing Date:
March 17, 1998
Export Citation:
Assignee:
UNISIA JECS CORP
International Classes:
G01N27/409; F02D41/14; F02D45/00; G01N27/41; H05B1/02; (IPC1-7): G01N27/409; F02D41/14; G01N27/41
Attorney, Agent or Firm:
笹島 富二雄
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