Air fuel ratio control device

Abstract

Abstract PURPOSE:To prevent deterioration of air-fuel ratio control and to improve the operationability by comparing the level of flow-in current with predetermined referential level and stopping feedback control of air-fuel upon decision of abnormality through O2 sensor and clamping to specific air-fuel ratio. CONSTITUTION:Comparators 24, 25 constituting a stop command means 23 is provided with upper and lower limits UL, LL from referential level setting means 28, and if the level of flow-in current Is to O2 sensor 1 will deviate from said limits UL, LL, the sensor 1 is decided to be abnormal. Consequently, said means 23 will produce a command signal S4 and feed to air-fuel ratio control means 30 thus to stop feedback control and to maintain the air-fuel ratio at predetermined level.

Inventors

• 👤 Takeshi Kitahara
• 👤 剛 北原

Bibliographic Details