초록 ▼

The temperature and air-fuel ratio of the exhaust gases of an internal combustion engine are sensed to generate signals indicative thereof and the amount of fuel to be injected into the engine is determined in accordance with the signals, thus controlling the air-fuel ratio at a predetermined value

The temperature and air-fuel ratio of the exhaust gases of an internal combustion engine are sensed to generate signals indicative thereof and the amount of fuel to be injected into the engine is determined in accordance with the signals, thus controlling the air-fuel ratio at a predetermined value and thereby decreasing the abnormal temperature rise in the exhaust system.

대표청구항 ▼

A method of controlling the air-fuel ratio of an internal combustion engine comprising the steps of: sensing the amount of air sucked into the engine to generate an intake signal; sensing the temperature of the exhaust gases of said engine to generate a temperature signal; sensing the air-fuel ratio

A method of controlling the air-fuel ratio of an internal combustion engine comprising the steps of: sensing the amount of air sucked into the engine to generate an intake signal; sensing the temperature of the exhaust gases of said engine to generate a temperature signal; sensing the air-fuel ratio by monitoring the composition of said exhaust gases to generate a ratio signal; discriminating whether the temperature of the exhaust gases is lower than a predetermined value on the basis of said temperature signal; first determining with a microcomputer, in response to said intake signal and said ratio signal, the amount of fuel to be injected to cause the air-fuel ratio to approach a stoichiometric air-fuel ratio on the basis of said ratio signal when the temperature of exhaust gases is lower than said predetermined value; second predetermining with a microcomputer, in response to said intake signal and said ratio signal the injection fuel amount to cause the air-fuel ratio to become rich on the basis of said air-fuel ratio signal when the exhaust gas temperature is higher than the predetermined value; and injecting the fuel into said engine on the basis of said determining steps. An air-fuel ratio control apparatus for an internal combustion engine comprising: means for sensing the amount of air sucked into the engine; temperature sensor means for sensing the temperature of the exhaust gases of said engine to generate a temperature signal; air-fuel ratio sensor means for sensing the air-fuel ratio by monitoring the composition of said exhaust gases to generate a ratio signal; microcomputer means, responsive to said temperature signal and said ratio signal for (1) determining response to said temperature signal whether the temperature of the exhaust gases is lower than a predetermined value; (2) determining in response to said intake signal and said ratio signal; the amount of fuel to be injected to cause the air-fuel ratio to approach a stoichiometric air-fuel ratio when the temperature of exhaust gases is lower than the predetermined value; and (3) determining in response to said intake signal and said ratio signal the injection fuel amount to cause the air-fuel ratio to become rich when the exhaust gas temperature is higher than the predetermined value; and injector means, responsive to said microcomputer for injecting fuel into the engine.