Controller for Internal Combustion Engine
A technology for internal combustion engines and controllers, which is applied in engine control, machine/engine, electrical control, etc., and can solve problems such as highly accurate estimation and air-fuel ratio that cannot be determined
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no. 1 example
[0024] refer to Figures 1 to 8 , the first embodiment will be described below.
[0025] First, refer to figure 1 , explains the engine control system. An air cleaner 13 is arranged upstream of the intake pipe 12 of the internal combustion engine 11 . Downstream of the air cleaner 13 is provided an air flow meter 14 that detects an intake flow rate. The engine 11 is an inline four-cylinder engine. Downstream of the air flow meter 14 are provided a throttle valve 15 driven by a DC motor and a throttle position sensor 16 that detects a throttle position.
[0026] A buffer tank 17 including an intake pressure sensor 18 is provided downstream of the throttle valve 15 . The intake air pressure sensor 18 detects intake air pressure. An intake manifold 19 that introduces air into each cylinder of the engine 11 is provided downstream of the surge tank 17 , and a fuel injector 20 that injects fuel is provided near an intake port of the intake manifold 19 of each cylinder. When t...
no. 2 example
[0099] refer to Figures 9 to 13 , the second embodiment will be described below. In the second embodiment, the same reference numerals are used to designate the same parts and components as in the first embodiment, and the same description will not be repeated.
[0100] Depending on the engine driving state, the air-fuel ratio may not be estimated.
[0101] According to the second embodiment, the ECU 39 executes Figure 9 to Figure 11 Each routine shown in . When performing cylinder-by-cylinder air-fuel ratio control, a learning value is calculated with respect to each cylinder based on a correction coefficient for each cylinder. This learned value for each cylinder is stored in backup memory such as backup RAM and EEPROM. The cylinder-by-cylinder air-fuel ratio control is performed in view of the learned value stored in the memory. ECU 39 serves as a learning section and a learning value reflection section.
[0102] [Cylinder-by-cylinder air-fuel ratio estimation and a...
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