Air/fuel ratio control system equipped with a temperature...

Details Air/fuel ratio control system equipped with a temperature... Air/fuel ratio control system equipped with a temperature...

F - Mech Eng,Light,Heat,Weapons

02

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341/38.14

F02D 28/00 (2006.01) F02D 41/22 (2006.01) F01P 11/16 (2006.01)

Patent

CA 1130414

ABSTRACT OF THE DISCLOSURE An air/fuel ratio control system equipped with a temperature sensor fail-safe system for an internal combustion engine, comprises an engine parameter detect- ing circuit for the estimation whether the engine coolant temperature sensor is normal or not, a constant voltage supply, and a switching circuit for transmitting the constant voltage to a control signal generator, in place of the output signal of the engine coolant temperature sensor, the control signal generator generating a control signal in accordance with various engine parameters in- cluding the engine temperature for the control of the air/fuel ratio of an air/fuel mixture supplied to the engine, thereby providing the control signal generator with a suitable signal when a failure occurs in the engine coolant temperature sensor to prevent undesirable operation.

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