Diagnostic apparatus and method for supplying assist air in an i

Details Diagnostic apparatus and method for supplying assist air in an i Diagnostic apparatus and method for supplying assist air in an i

1999-03-29

2000-12-12

Solis, Erick

Internal-combustion engines

Charge forming device

Auxiliary air or gas used to inject fuel

731173, 731182, F02M 2300, F02D 4122

Patent

active

061584207

ABSTRACT:
A diagnostic apparatus for supplying an assist air in an internal combustion engine includes: an assist air passage for guiding intake air from upstream of a throttle valve to a fuel injector installed downstream of said throttle valve; an assist air control valve installed in said assist air passage; a sensor for detecting an engine operating parameter; and a control unit. The control unit includes a data storage portion and a data processing portion. The control unit selectively forces the assist air control valve open and closed upon detection of at least one predetermined diagnosis condition. The control unit then calculates and stores a plurality of values corresponding to changes in the engine operating parameter based on signals received from the sensor, and determines an occurrence of an error with assist air supply based on comparisons of said values with a predetermined value.

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