Electronic fuel injection control system for an internal...

F - Mech Eng,Light,Heat,Weapons – 02 – D

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341/38.121

F02D 28/00 (2006.01) F02D 41/26 (2006.01)

Patent

CA 1135369

P-315 360-77-0800 (ME) ELECTRONIC FUEL INJECTION CONTROL SYSTEM FOR AN INTERNAL COMBUSTION ENGINE ABSTRACT An electronic fuel injection (EFI) control system (10) for an internal combustion engine. The EFI control system (10) is disclosed in conjunction with a compression ignition engine (12) where the parameters of fuel quantity (426) and injection timing (460) are controlled on the basis of a plurality of engine operating conditions. The parameter of fuel quantity (426) is obtained from a comparison of com- puted values of percent load fuel quantity (428) and full load fuel quantity (444) with the lesser of the two being selected. The percent load fuel quantity (428) has a proportional component (416) that is a function of actual engine speed (414) and commanded engine speed (412), and an integral component (426) that is related to cumulative speed error (422). The full load fuel quantity (444) is a function of actual engine speed (414) and manifold air density (436). The parameter of injection timing (460) is obtained from a summation of two computed quantities for injection advance. One quantity (452) is a function of actual engine speed (414) and the selected fuel quantity (446). The other quantity (456) is a function of air temperature (442). The system (10) includes the capability to trim fuel quantity (446) to compensate for variations in indi- vidual injector (42) and cylinder (16) characteristics. In operation of the system (10) the plurality of engine operating conditions are measured in synchronism with the engine operating cycle and placed in buffer storage (2030, 2040). The computations relating to fuel quantity and injection advance are executed asynchronously with the engine operating cycle on the basis of the measured values in buffer storage (2030, 2040). The results of the P-315 360-77-0800 (ME) which relate to parameter values for fuel quantity (446) and injection advance (460) are placed in other buffer storage (2030, 2040). These computed parameter values are then retrieved by direct memory access (DMA) activities to be used in controlling the actuation of injectors (42) mounted on the engine (12). The DMA activities are carried out in synchronism with the engine operating cycle.

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